US20100261435A1 - Multiple frequency band information signal frequency band compression - Google Patents
Multiple frequency band information signal frequency band compression Download PDFInfo
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- US20100261435A1 US20100261435A1 US12/506,711 US50671109A US2010261435A1 US 20100261435 A1 US20100261435 A1 US 20100261435A1 US 50671109 A US50671109 A US 50671109A US 2010261435 A1 US2010261435 A1 US 2010261435A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
- H04B1/0075—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands using different intermediate frequencied for the different bands
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
- H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
Abstract
Description
- The present application claims priority to U.S. Provisional Application No. 61/167,933, filed Apr. 9, 2009, which is incorporated herein in its entirety for all purposes.
- 1. Technical Field
- The present invention relates generally to wide band wireless signal operations; and more particular to up/down conversion in frequency.
- 2. Related Art
- Communication systems are known to support wireless and wire lined communications between wireless and/or wire lined communication devices. Such communication systems range from national and/or international cellular telephone systems to the Internet to point-to-point in-home wireless networks. Each type of communication system is constructed, and hence operates, in accordance with one or more communication standards. For instance, wireless communication systems may operate in accordance with one or more standards including, but not limited to, IEEE 802.11x, Bluetooth, wireless wide area networks (e.g., WiMAX), advanced mobile phone services (AMPS), digital AMPS, global system for mobile communications (GSM), North American code division multiple access (CDMA), Wideband CDMA, local multi-point distribution systems (LMDS), multi-channel-multi-point distribution systems (MMDS), radio frequency identification (RFID), Enhanced Data rates for GSM Evolution (EDGE), General Packet Radio Service (GPRS), and many others.
- Depending on the type of wireless communication system, a wireless communication device, such as a cellular telephone, two-way radio, personal digital assistant (PDA), personal computer (PC), laptop computer, home entertainment equipment, RFID reader, RFID tag, et cetera communicates directly or indirectly with other wireless communication devices. For direct communications (also known as point-to-point communications), the participating wireless communication devices tune their receivers and transmitters to the same channel or channels (e.g., one of the plurality of radio frequency (RF) carriers of the wireless communication system or a particular RF frequency for some systems) and communicate over that channel(s). For indirect wireless communications, each wireless communication device communicates directly with an associated base station (e.g., for cellular services) and/or an associated access point (e.g., for an in-home or in-building wireless network) via an assigned channel. To complete a communication connection between the wireless communication devices, the associated base stations and/or associated access points communicate with each other directly, via a system controller, via the public switch telephone network, via the Internet, and/or via some other wide area network.
- For each wireless communication device to participate in wireless communications, it includes a built-in radio transceiver (i.e., receiver and transmitter) or is coupled to an associated radio transceiver (e.g., a station for in-home and/or in-building wireless communication networks, RF modem, etc.). As is known, the receiver is coupled to an antenna and includes a low noise amplifier, one or more intermediate frequency stages, a filtering stage, and a data recovery stage. The low noise amplifier receives inbound RF signals via the antenna and amplifies then. The one or more intermediate frequency stages mix the amplified RF signals with one or more local oscillations to convert the amplified RF signal into baseband signals or intermediate frequency (IF) signals. The filtering stage filters the baseband signals or the IF signals to attenuate unwanted out of band signals to produce filtered signals. The data recovery stage recovers raw data from the filtered signals in accordance with the particular wireless communication standard.
- As is also known, the transmitter includes a data modulation stage, one or more intermediate frequency stages, and a power amplifier. The data modulation stage converts raw data into baseband signals in accordance with a particular wireless communication standard. The one or more intermediate frequency stages mix the baseband signals with one or more local oscillations to produce RF signals. The power amplifier amplifies the RF signals prior to transmission via an antenna.
- Many wireless transceivers are able to support multiple communication standards, which may be in the same frequency band or in different frequency bands. For example, a wireless transceiver may support Bluetooth communications for a personal area network and IEEE 802.11 communications for a Wireless Local Area Network (WLAN). In this example, the IEEE 802.11 communications and the Bluetooth communications may be within the same frequency band (e.g., 2.4 GHz for IEEE 802.11b, g, etc.). Alternatively, the IEEE 802.11 communications may be in a different frequency band (e.g., 5 GHz) than the Bluetooth communications (e.g., 2.4 GHz). For Bluetooth communications and IEEE 802.11b, (g), etc. communications there are interactive protocols that appear to the user as simultaneous implementation, but is actually a shared serial implementation. As such, while a wireless transceiver supports multiple types of standardized communications, it can only support one type of standardized communication at a time.
- A transceiver that supports multiple standards includes multiple RF front-ends (e.g., on the receiver side, separate LNA, channel filter, and IF stages for each standard and, on the transmitter side, separate IF stages, power amplifiers, and channels filters for each standard). As such, multiple standard transceivers include multiple separate RF front-ends; one for each standard in a different frequency band, channel utilization scheme (e.g., time division multiple access, frequency division multiple access, code division multiple access, orthogonal frequency division multiplexing, etc.), and/or data modulation scheme (e.g., phase shift keying, frequency shift keying, amplitude shift keying, combinations and/or variations thereof). Such multiple transceivers are fixed in that they can typically support standards to which they were designed. The transceiver may also include separate baseband processing modules for each communication standard supported. Thus, as a new standard is released, new hardware may be needed for a wireless communication device to support the newly released standard.
- Therefore, a need exists for a transceiver that is capable of at least partially overcoming one or more of the above mentioned multiple standard limitations.
- The present invention is directed to apparatus and methods of operation that are further described in the following Brief Description of the Drawings, the Detailed Description of the Invention, and the claims. Other features and advantages of the present invention will become apparent from the following detailed description of the invention made with reference to the accompanying drawings.
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FIG. 1 is a system diagram illustrating a wireless communication system constructed and operating according to one or more embodiments of the present invention; -
FIG. 2 is a illustrating the power spectral density of a Radio Frequency (RF) Multiple Frequency Bands Multiple Standard (MFBMS) signal and components of a wireless device that operates thereupon according to one or more embodiments of the present invention; -
FIG. 3 is a diagram illustrating power spectral densities of a RF MFBMS signal and a Baseband/Intermediate frequency (BB/IF) MFBMS signal constructed and operated on according to one or more embodiments of the present invention; -
FIG. 4A is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention; -
FIG. 4B is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention; -
FIG. 4C is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention; -
FIG. 4D is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention; -
FIG. 5 is a flow chart illustrating receive operations according to one or more embodiments of the present invention; -
FIG. 6 is a flow chart illustrating transmit operations according to one or more other embodiments of the present invention; -
FIG. 7 is a block diagram illustrating the structure of a receiver portion of a wireless device constructed according to one or more embodiments of the present invention; -
FIG. 8 is a block diagram illustrating the structure of a transmitter portion of a wireless device constructed according to one or more embodiments of the present invention; -
FIG. 9 is a block diagram illustrating receiver and transmitter portions of a wireless device constructed according to another embodiment of the present invention utilizing a super heterodyne architecture; -
FIG. 10 is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention; -
FIG. 11A is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention; -
FIG. 11B is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention; -
FIG. 11C is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention; -
FIG. 11D is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention; -
FIG. 12 is a flow chart illustrating receive operations according to one or more embodiments of the present invention; -
FIG. 13 is a flow chart illustrating transmit operations according to one or more embodiments of the present invention; -
FIG. 14 is a block diagram illustrating a receiver section of a wireless device constructed according to one or more embodiments of the present invention; -
FIG. 15 is a block diagram illustrating a transmitter section of a wireless device constructed according to one or more embodiments of the present invention; and -
FIG. 16 is a block diagram illustrating a transmitter section of a wireless device constructed according to another embodiment of the present invention. -
FIG. 1 is a system diagram illustrating a wireless communication system constructed and operating according to one or more embodiments of the present invention. Thewireless communication system 100 ofFIG. 1 includes a communication infrastructure and a plurality of wireless devices. The communication infrastructure includes one or morecellular networks 104, one or more wireless local area networks (WLANs) 106, and one or more wireless wide area networks (WWANs) 108. Thecellular networks 104,WLANs 106,WWANs 108 all typically couple to one or more backbone networks. The backbone networks 102 may include the Internet, the Worldwide Web, one or more public switched telephone network backbones, one or more cellular network backbones, one or more private network backbones and/or other types of backbones that support communications with the variouswireless network infrastructures server computer 110 couples tocellular network 104,web server 112 couples to the Internet/WWW/PSTN/Cell network 102, andserver 114 couples toWWAN network 108. Other devices may couple to these networks as well in various other constructs. - Each of the
cellular networks 104,WLANs 106, andWWANs 108 support wireless communications with wireless devices in various wireless spectra and according to various communication protocol standards. For example, thecellular network 104 may support wireless communications with wireless devices within the 800 MHz band and the 1900 MHz band, and/or other Radio Frequency (RF) bands that are allocated for cellular network communications. Thecellular network 104 may support GSM, EDGE, GPRS, 3G, CDMA, TDMA, and/or various other standardized communications. Of course, these are examples only and should not be considered to limit the spectra or operations used by such cellular networks. TheWLANs 106 typically operate within the Industrial, Scientific, and Medical (ISM) bands that include the 2.4 GHz and 5.8 GHz bands. The ISM bands include other frequencies as well that support other types of wireless communications, such bands including the 6.78 MHz, 13.56 MHz, 27.12 MHz, 40.68 MHz, 433.92 MHz, 915 MHz, 24.125 GHz, 61.25 GHz, 122.5 GHz, and 245 GHz bands. The WWANs networks 108 may operate within differing RF spectra based upon that which is allocated at any particular locale. Device to device communications may be serviced in one of these frequency bands as well. - The
wireless network infrastructures wireless devices laptop computers desktop computers cellular telephones portable data terminals multiple GPS satellites 150. - The wireless devices 116-136 may support peer-to-peer communications as well, such peer-to-peer communications not requiring the support of a wireless network infrastructure. For example, these devices may communicate with each other in a 60 GHz spectrum, may use a peer-to-peer communications within a WLAN spectrum, for example, or may use other types of peer-to-peer communications. For example, within the ISM spectra, wireless devices may communicate according to Bluetooth protocol or any of the various available WLAN protocols supported by IEEE802.11x, for example.
- Various aspects of the present invention will be described further herein with reference to
FIGS. 2-16 . According to these aspects, one or more of the wireless devices includes a wide band RF receiver, RF transmitter, and/or RF transceiver. The RF receiver/transmitter/transceiver does not require multiple differing transceivers to support communications within differing frequency bands and/or according to different communication standards. While prior wireless devices that supported communications withcellular network infrastructure 104 andwireless network infrastructure 106 required separate RF transceivers, devices constructed and operating according to embodiments of the present invention do not. According to embodiments of the present invention, a single RF transceiver may be used to support communications within differing RF spectra and according to differing communication standard protocols. As will be described further with reference toFIG. 2 , a signal that encompasses multiple frequency bands and multiple communication standards is referred to as a multiple frequency band multiple standards (MFBMS) signal. According to the present invention, the wireless devices include an RF transmitter and/or RF receiver that support communications using such MFBMS signals. -
FIG. 2 is a combination block and signal diagram illustrating the structure of a RF MFBMS signal and components of a wireless device that operates thereupon according to one or more embodiments of the present invention. A RF MFBMS signal resides within anMFBMS spectrum 200. The MFBMS signal includes information signals within a plurality offrequency bands more channels corresponding frequency bands frequency band 202A may include a plurality of channels. For example,frequency band 202A includeschannel 204A,frequency band 202B includeschannel 204B, andfrequency band 202C includeschannel 204C. The inboundRF MFBMS signal 256 in the example ofFIG. 2 includes threediffering frequency bands frequency bands - Components of a wireless device illustrated in
FIG. 2 include atransceiver 250 andbaseband processing module 260.Transceiver 250 includesreceiver section 252 andtransmitter section 254. Thereceiver section 252 receives the inboundRF MFBMS signal 256 and produces a down convertedsignal 258 tobaseband processing module 260. The down convertedsignal 258 may be a Baseband/Intermediate Frequency (BB/IF) MFBMS signal. Thebaseband processing module 260 operates upon the down convertedsignal 258 to produceinbound data 262. Suchinbound data 262 may simply include data that has been extracted from one or more information signals carried within the inboundRF MFBMS signal 256. - Likewise, the
baseband processing module 260 receivesoutbound data 264 and operates on the outbound data to produce anoutbound signal 266, which may be an outbound BB/IF MFBMS signal. The outbound BB/IF MFBMS signal 266 is received bytransmitter section 254 and converted to produce an outboundRF MFBMS signal 268. TheRF MFBMS signal 268 is transmitted via an antenna. -
FIG. 3 is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention. Operations that produce or operate upon the RF MFBMS and BB/IF MFBMS signals ofFIG. 3 may be performed by any of the various wireless devices illustrated inFIG. 1 , in corresponding receiver sections and/or transmitter sections. As is shown, anRF MFBMS signal 300 resides within anRF MFBMS spectrum 310. The BB/IF MFBMS signal 360 resides within a BB/IF MFBMS spectrum 350. TheRF MFBMS signal 300 and/or the BB/IF MFBMS signal 360 may either be an inbound or outbound MFBMS signal. Upconversion operations 331 and downconversion operations 330 according to the present invention are used to form and operate upon theRF MFBMS signal 300, respectively. Downconversion operations 330 produce the BB/IF MFBMS signal 360 from the incomingRF MFBMS signal 300. Upconversion operations 331 produce the RF MFBMS signal 300 from the BB/MFBMS signal 360. - The
RF MFBMS signal 300 includes information signals 302, 304, 306, and 308 that reside within a plurality of corresponding frequency bands. The information signal frequency bands are centered at FC1, FC2, FC3, and FC4 and have respective information signal bandwidths. These bandwidths may be dedicated, frequency division multiplexed, time division multiplexed, code division multiplexed, or combinationally multiplexed. The width of these respective frequency bands depends upon their spectral allocation, typically defined by a country or region, e.g., United States, North America, South America, Europe, etc. Each of these frequency bands may be divided into channels. However, some of these frequency bands may be wide-band allocated and not further sub-divided. - Each of these information signals 302, 304, 306, and 308 was/is formed according to a corresponding communication protocol and corresponds to a particular type of communication system. For example, band 1 may be a cellular band, band 2 may be a WLAN band, band 3 may be another cellular band, and band 4 may be a 60 GHz/MMW band. In differing embodiments, these bands may be GPS band(s) and/or WWAN bands, among other bands. An information signal band may carry bidirectional communications that may be incoming or outgoing. When the information signals are unidirectional, such as with Global Positioning System (GPS) signals, the GPS band will be present only in an incoming RF MFBMS signal but not in an outgoing RF MFBMS signal.
- With the MFBMS signals of
FIG. 3 , all information signals residing within theRF MFBMS spectrum 310 are down converted to produce corresponding information signals within the BB/IF MFBMS spectrum 350. Likewise, all information signals residing within the BB/IFspectrum 350 are up converted to produce corresponding information signals within theRF MFBMS spectrum 310. Thus, as illustrated inFIG. 3 , each of the information signals of theRF MFBMS signal 300 have corresponding information signals in the BB/IF MFBMS signal 360, which carry identical information in a same signal format but at different frequencies. Generally,FIG. 3 illustrates a simple down conversion of a wide band signal and a simple up conversion of a wideband signal. In other embodiments, as will be described further herein, not all information signals of the RF MFBMS signal have corresponding information signals in the BB/IF MFBMS signal. -
FIG. 4A is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention. As compared toFIG. 3 , downconversion operations 400 ofFIG. 4A produce a differing BB/IF MFBMS signal 402 from theRF MFBMS signal 300 as compared to the BB/IF MFBMS signal 360 ofFIG. 3 . With the example ofFIG. 4A , information signals 302, 304, 306, and 308 resides within theRF MFBMS spectrum 310. Each of these information signals 302, 304, 306, and 308 has a corresponding component in the BB/IF MFBMS signal 402. However, as compared to the spectral position of the information signals 302, 304, 306, and 308 of the BB/IF MFBMS signal 360 ofFIG. 3 , the information signals 302, 304, 306, and 308 of the BB/IF MFBMS signal 402 ofFIG. 4A reside at differing spectral positions. Such is the case because thedown conversion operations 400 ofFIG. 4A use a differing shift frequency than do thedown conversion operations 330 ofFIG. 3 . In such case, a frequency shift signal used by one or more mixing components of a wireless device performing thedown conversion operations 400 differs between the embodiments ofFIG. 3 andFIG. 4A . - Thus, within the BB/
IF MFBMS spectrum 404 ofFIG. 4A , information signals 302 and 304 reside left of 0 Hz frequency while information signals 306 and 308 reside right of 0 Hz frequency. Within a wireless device performing thedown conversion operations 400 ofFIG. 4A , the wireless device may implement band pass (high pass) filtering usingfilter spectrum 406 to remove information signal 302 and 304 components less than 0 Hz while leaving information signal 306 and 308 components. Such filtering may be done using analog filter(s) and/or digital filter(s). Digital filtering using thefilter spectrum 406 may be done by the baseband processing module. After such filtering operations, only information signals 306 and 308 have corresponding components within the BB/IF MFBMS signal 402. The baseband processing module then operates upon the BB/IF MFBMS signal 402 to extract data there from. According to the present invention, the baseband processing module may extract data from both/either information signals 306 and 308. -
FIG. 4B is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention. The power spectral densities of the BB/IF MFBMS signal 412 ofFIG. 4B differ from those ofFIGS. 3 and 4A while the power spectral density of the RF MFBMS signal 300 ofFIG. 4B is same/similar to that ofFIGS. 3 and 4A . - Down
conversion operations 410 convert theRF MFBMS signal 300 to the BB/IF MFBMS signal 412. The downconversion operations 410 are performed using a shift frequency that causes the information signals 302, 304, 306, and 308 to reside at particular locations within the baseband BB/IF MFBMS spectrum 414 with respect to 0 Hz. As contrasted to thedown conversion operations 330 ofFIG. 3 and to thedown conversion operations 400 ofFIG. 4A , thedown conversion operations 410 ofFIG. 4B use a differing shift frequency. With the down conversion shift frequency used withFIG. 4B , information signal 304, information signal 306, and information signal 308 have corresponding signal components at frequencies greater than 0 Hz within the BB/IF MFBMS signal 412 while information signal 302 has components below 0 Hz within the BB/IF MFBMS signal 412. Applying a filter operation usingfilter spectrum 416, e.g. hi pass filter, information signal 302 component of BB/IF MFBMS signal 452 is removed. After this filtering operation only information signals 304, 306, and 308 reside within the BB/IF MFBMS signal 412 and are available for data extraction there from by the baseband processing module. -
FIG. 4C is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention. The power spectral densities of the BB/IF MFBMS signal 420 and the RF MFBMS signal 426 ofFIG. 4C differ from those ofFIGS. 3 , 4A, and 4B. - Present in a BB/IF MFBMS signal 420 are
information signals IF MFBMS spectrum 422. Upconversion operations 424 convert the BB/IF MFBMS signal 420 to theRF MFBMS signal 426. The upconversion operations 424 are performed using a shift frequency that causes the information signals 430 and 432 to reside at particular frequency bands/center frequencies within theRF MFBMS spectrum 428. As contrasted to the upconversion operations 331 ofFIG. 3 , the upconversion operations 424 ofFIG. 4C use a differing shift frequency. The shift frequency chosen for the upconversion operations 424 ofFIG. 4C is based upon the spectral position of information signals 430 and 432 within the BB/IF MFBMS signal 420 and the desired spectral positions of the information signals 430 and 432 within theRF MFBMS signal 426. Note that theRF MFBMS spectrum 428 is empty except for the position of the information signals 430 and 432. Such is the case because the corresponding wireless device only outputs communication signals at these spectral positions, Bandx and Bandy. -
FIG. 4D is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention. The power spectral densities of the BB/IF MFBMS signal 450 and the RF MFBMS signal 456 ofFIG. 4D differ from those ofFIGS. 3 , 4A, 4B, and 4C. - Present in a BB/IF MFBMS signal 450 of a BB/
IF MFBMS spectrum 452 areinformation signals conversion operations 454 convert the BB/IF MFBMS signal 450 to theRF MFBMS signal 456. The upconversion operations 454 are performed using a shift frequency that causes the information signals 458, 460, and 462 to reside at particular frequency bands/center frequencies within theRF MFBMS spectrum 464. As contrasted to the upconversion operations 331 ofFIG. 3 and the upconversion operations 424 ofFIG. 4C , the upconversion operations 454 ofFIG. 4D use a differing shift frequency. The shift frequency chosen for the upconversion operations 454 ofFIG. 4D is based upon the spectral position of information signals 458, 460, and 462 within the BB/IF MFBMS signal 450 and the desired spectral positions of the information signals 458, 460, and 462 within theRF MFBMS signal 456. Note that theRF MFBMS signal 456 within theRF MFBMS spectrum 464 is empty except for the position of the information signals 458, 460, 462, and 464. Such is the case because the corresponding wireless device only outputs these information signals. - With each of the operations described with reference to
FIGS. 4A-4D and the subsequent figures described herein, filtering of an IF signal may be performed with subsequent down conversion to baseband. In such case, a bandpass filter having a filter spectrum, e.g.,filter spectrum 406,filter spectrum 416, etc. may be employed to filter the IF signal to remove unwanted information signals. The filtered IF signal may then be down converted to a baseband signal with the unwanted information signals missing. -
FIG. 5 is a flow chart illustrating operations according to one or more embodiments of the present invention. Theoperations 500 ofFIG. 5 commence with a wireless device determining a set of information signals for receipt (Step 502). The set of information signals for receipt are carried by an RF MFBMS signal that includes a plurality of information signal residing within corresponding information signal frequency bands. Referring again toFIG. 3 , information signals 302, 304, 306, and 308 form theRF MFBMS signal 300. With the operation ofStep 502, the wireless device may identify all of these information signals for receipt or only a portion of these information signals for receipt. The information signals may carry an inbound portion of a bidirectional communication, a GPS signal, a broadcast signal, or another type of signal. As was previously described, - Referring again to
FIG. 5 , afterStep 502 is completed, the wireless device determines the RF frequency bands of the signals of interest within theRF MFBMS signal 300. For example, referring toFIG. 3 , the wireless device may determine that it is interested in information signals 306 and 308. In another operation, the wireless device may determine that it is interested in only information signals 302 and 304. In still another operation, the wireless device may determine that it is interested in information signals 302, 304, and 306. - Next, referring again to
FIG. 5 , the wireless device determines the desired BB/IF frequency band(s) for positioning of the information signals for data extraction operations (Step 506). For example, referring toFIG. 4A , the wireless device determines that it will extract data from information signals 306 and 308. The wireless device then decides that it would like to have the information signals 306 and 308 reside at corresponding positions within the BB/IF MFBMS spectrum 404. Likewise, with reference toFIG. 4B , the wireless device determines that it is interested in information signals 304, 306, and 308 and determines the positions for these information signals within the BB/IF MFBMS spectrum 404. A differing determination would be made for the example ofFIG. 3 . The wireless device makes this determination atStep 506 ofFIG. 5 . - Based upon the RF frequency bands of the signals of interest for receipt and the desired BB/IF MFBMS frequency bands, the wireless device then determines a shift frequency (Step 508). With the examples of
FIGS. 3 , 4A, and 4B, various BB/IF MFBMS signals 360, 402, and 412 are illustrated. These BB/IF MFBMS signals 360, 402, and 412 require differing shift frequencies for respective downconversion operations Step 508, determines the shift frequency that will result in the information signals being down converted from the RF MFBMS spectrum to reside at desired positions in the BB/IF MFBMS spectrum. -
Operation 500 continues with the wireless device down converting the RF MFBMS signal to produce the BB/IF MFBMS signal using the shift frequency determined at Step 508 (Step 510). Then, the wireless device filters the BB/IF MFBMS signal to remove undesired spectra (Step 512). Examples of such filtering operations are illustrated inFIGS. 4A and 4B usingfilter spectrums - With the
operations 500 ofFIG. 5 , an RF receiver section of the wireless device performs differing operations for differing sets of information signals for receipt within the RF MFBMS signal. For example, for a first set of information signals of the RF MFBMS signals for receipt, the RF receiver section down converts the RF MFBMS signal by a first shift frequency to produce the BB/IF MFBMS signal. Further, for a second set of information signals of the RF MFBMS signal for receipt, the RF receiver section down converts the RF MFBMS signal by a second shift frequency to produce the BB/IF MFBMS signal, wherein the second shift frequency differs from the first shift frequency. Thebaseband processing module 260 ofFIG. 2 for example, processes the BB/IF MFBMS signal to extract data there from. - The illustrated example of the
operations 500 ofFIG. 5 may be extended for a third set of information signals of the RF MFBMS signal. In such case, for a third set of information signals that differs from the first and second sets of information signals, the wireless device determines a third shift frequency that differs from both the first and second shift frequencies. The RF receiver section then down converts the RF MFBMS signal to produce the BB/IF MFBMS signal that has a third frequency spectra as compared to the differing first and second frequency spectras. Referring to all ofFIGS. 3 , 4A, and 4B, the three differing frequency shift examples are shown. For example, with the operations ofFIG. 3 , a first shift frequency produces a first BB/IF MFBMS signal 360, with the second shift frequency ofFIG. 4A , downconversion operations 400 produce BB/IF MFBMS signal 402, and with the third shift frequency ofFIG. 4B , downconversion operations 410 produce a BB/IF MFBMS signal 412 that differs from both the spectras ofFIGS. 3 and 4A . As was shown inFIGS. 4A and 4B , high pass filter operations usingfilter spectrums - With various operations according to
FIG. 5 , the first information signal frequency band of the RF MFBMS signal may include a WLAN signal, a WPAN signal, a cellular signal, GPS signal, a MMW signal, a WWAN signal, and/or another type of information signal. These various information signals may be bidirectional communication signals or may be unidirectional communication signals such as GPS communication signals. Thus, according to the present invention, the wireless device receives information signals in multiple frequency bands and down converts them using a single down conversion operation to produce the BB/IF MFBMS signal. The down conversion operations use a shift frequency that is based upon not only the positions of the information signals within the RF MFBMS spectrum but also the desired positions of the information signals within the BB/IF MFBMS signal. Further, the down conversion shift frequency will also be determined by whether or not the wireless device can move some information signals below 0 Hz in the BB/IF MFBMS spectrum so that they can be easily filtered prior to data extraction operations. -
FIG. 6 is a flow chart illustrating operations according to one or more other embodiments of the present invention. Transmitoperations 600 of a wireless device are illustrated inFIG. 6 . The transmitoperations 600 include the wireless device first determining RF frequency bands of RF MFBMS signals of interest (Step 602). The wireless device then determines the location of signals of interest that will be created within the BB/IF frequency band (Step 604). For example, in some operations, the wireless device, in particular a baseband processing module, positions information signals in first spectral positions within a BB/IF MFBMS signal, see e.g.,FIG. 4C , while in a second operation the wireless device positions the information signals in second spectral positions within the BB/IF signal, see e.g.,FIG. 4D . - Then, the wireless device determines a shift frequency based upon the RF frequency bands and BB/IF frequency bands of the signals of interest (Step 606). The baseband processor then modulates the data to create the BB/IF MFBMS signal (Step 608). The wireless device, particularly an RF transmitter section of the wireless device, up converts the BB/IF MFBMS signal to produce the RF MFBMS signal (Step 610). The wireless device may then filter the BB/IF MFBMS signals to remove undesired spectra (Step 612).
- With particular reference to
FIG. 4C , a baseband processing module of a wireless device produces information signals 430 and 432 in particular corresponding locations within BB/IF MFBMS signal 420. The wireless device then determines at what frequencies the information signals 430 and 432 are to reside within theRF MFBMS signal 426. Then, based upon these frequencies, the wireless device determines a corresponding shift frequency and then performs upconversion operations 424 to produce theRF MFBMS signal 426. - With particular reference to
FIG. 4D , a baseband processing module of a wireless device produces information signals 458, 460, and 462 in particular corresponding locations within BB/IF MFBMS signal 450. The wireless device then determines at what frequencies the information signals 458, 460, and 462 are to reside within theRF MFBMS signal 456. Then, based upon these frequencies, the wireless device determines a corresponding shift frequency and then performs upconversion operations 454 to produce theRF MFBMS signal 456. Note that the operations producing the signals ofFIG. 4C differ from the operations producing the signals ofFIG. 4D with differing shift frequencies used. Parallels between the operations ofFIGS. 6 and 7 may be drawn with regard to differing shift frequencies used at differing times based upon the information signals desired for transmission. -
FIG. 7 is a block diagram illustrating the structure of a receiver portion of a wireless device constructed according to one or more embodiments of the present invention. The components illustrated are those of aRF receiver section 252 of a wireless device. TheRF receiver section 252 components are operable to support the operations previously described with reference toFIGS. 3 , 4A, 4B, and 5. Thereceiver section 252 receives an incoming RF MFBMS signal viaantenna 702. Thereceiver section 252 includes low noise amplifier (LNA) 704,optional filter 706,mixer 708,filter 710, analog-to-digital converter (ADC) 714, and local oscillator (LO) 718. Thebaseband processing module 260 receives the BB/IF MFBMS signal fromreceiver section 252. - With the embodiment of
FIG. 7 ,baseband processing module 260 provides input toLO 718 that causes the LO to produce a particular shift frequency. At differing times, the wireless device, particularly thebaseband processing module 260, causes the LO to produce differing shift frequencies. In performing these operations,baseband processing module 260 executes some of the operations ofFIG. 5 .LNA 704,filter 706,mixer 706,filter 710, andADC 714 may be tunable to have differing frequency transfer characteristics based upon the frequency of the signals of interest and the shift frequency.LO 718 receives an oscillation fromcrystal oscillator 720 and generates the shift frequency based there upon. -
FIG. 8 is a block diagram illustrating the structure of a transmitter portion of a wireless device constructed according to one or more embodiments of the present invention. Thetransmitter section 254 couples tobaseband processing module 260 and toantenna 702/812. The transmitter section and receiver section of a wireless device may share a single antenna or may use differing antennas. Further, in differing embodiments, the wireless device may include multiple antennas that are coupled to the transmitter section and receiver section via antenna coupling. - The
baseband processing module 260 produces a BB/IF MFBMS signal totransmitter section 254. Thetransmitter section 254 includes a digital-to-analog controller (DAC) 802,filter 804,mixer 806,filter 808, and power amplifier (PA) 810. The output of PA 810 (RF MFBMS signal) is provided toantenna 702/812 for transmission. TheLO 812 produces a shift frequency based upon inputs frombaseband processing module 260 and a crystal oscillation signal received fromcrystal oscillator 720. - In its operation, the
transmitter section 254 up converts the BB/IF MFBMS signal to the RF MFBMS signal based upon a shift frequency as determined by input received frombaseband processing module 260. ThePA 810,filter 808,mixer 806,filter 804, and/orDAC 802 may be frequency tunable with the tuning based upon the frequency band of the BB/IF MFBMS signal and the frequency spectra of the RF MFBMS signal.LO 812 is also tunable to produce differing shift frequencies over time. In some embodiments, thereceiver section 252 and thetransmitter section 254 may share an LO. -
FIG. 9 is a block diagram illustrating receiver and transmitter portions of a wireless device constructed according to another embodiment of the present invention utilizing a super heterodyne architecture. With the structure ofFIG. 9 , up conversion operations from BB/IF to RF and down conversion operations from RF to BB/IF are performed in multiple stages. The structure ofFIG. 9 may be employed with any of the operations of the present invention. - The
receiver section 252 includes first mixingstage 904 andsecond mixing stage 906. Thefirst mixing stage 904 receives a crystal oscillation fromlocal oscillator 720, the RF MFBMS signal fromantenna 902, and one or more shift frequency control inputs from thebaseband processing module 260. Thefirst mixing stage 904 performs a first down conversion operation based upon input signal Fs1. The output offirst mixing stage 904 is received bysecond mixing stage 906 that performs a second down conversion operation based upon the shift frequency Fs2. The output of thesecond mixing stage 906 is the BB/IF MFBMS signal that is received bybaseband processing module 260.Baseband processing module 260 extracts data from information signals contained within the BB/IF MFBMS signal. - On the transmit side,
transmitter section 254 receives BB/IF MFBMS signal frombaseband processing module 260. Thefirst mixing stage 908 up converts by a third shift frequency Fs3 the BB/IF MFBMS signal. The up converted signal produced by thefirst mixing stage 908 is received bysecond mixing stage 910 that performs a second up conversion operation on the signal and produces an RF MFBMS signal. The RF MFBMS signal is output toantenna 912 with the embodiment ofFIG. 9 . However as was previously described, differing embodiments of wireless device constructed according to the present invention may include multiple antennas and/or may include thereceiver section 252 andtransmitter section 254 sharing one or more antennas. -
FIG. 10 is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention. In particular, power spectral densities of aRF MFBMS signal 300 and a BB/IF MFBMS signal 1004 are shown. TheRF MFBMS signal 300 includes information signals 302, 304, 306, and 308 withinRF MFBMS spectrum 310. Each of these information signals 302, 304, 306, and 308 resides within corresponding information signal bands centered at corresponding center frequencies. - While the RF MFBMS signal 300 of
FIG. 10 is similar to that which is illustrated inFIGS. 3 , 4A, and 4B, the corresponding BB/IF MFBMS 1004 is not. As contrasted to the power spectral densities of the BB/IF MFBMS signals ofFIGS. 3 , 4A, and 4B, thedown conversion operations 1002 ofFIG. 10 result in band compression such that the information signals 302, 304, 306, and 308 of the BB/IF MFBMS signal 1004 have a differing frequency band separation than do the corresponding information signals ofFIGS. 3 , 4A, and 4B. The information signals 302, 304, 306, and 308 of theRF MFBMS signal 300 have a first frequency band separation. The information signals 302, 304, 306, and 308 of the BB/IF MFBMS signal 1004 have a second frequency band separation that differs from the first frequency band separation. The downconversion operations 1002 are performed such that band compression results. - Likewise, the up conversion operations 1008 of the BB/
IF MFBMS signal 1004 to theRF MFBMS signal 300 perform band expansion, resulting in alteration of frequency separation of the information signals within corresponding spectra. Thus, the up conversion operations ofFIG. 10 differ from those ofFIGS. 3 , 4B, and 4C. Operations that cause such frequency band compression and frequency band expansion will be described further herein with reference toFIGS. 12 and 13 , respectively. Structures that are operable to create and operate upon these signals will be described further herein with reference toFIGS. 14 , 15, and 16. -
FIG. 11A is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention. With the operations ofFIG. 11A , inboundRF MFBMS signal 300 is down converted by downconversion operations 1102 to perform band conversion, band compression, and band deletion such that not all information signals 302, 304, 306, and 308 signals are present in the inbound BB/IF MFBMS signal 1104. With the example ofFIG. 11A , only information signals 302, 304 and 308 are present in the inbound BB/IF MFBMS signal 1104. Further, as is shown, information signals 302, 304, and 308 in the inbound BB/IF MFBMS signal 1104 reside within a BB/IF MFBMS spectrum 1106 that differs from the BB/IF MFBMS spectrum 1106 ofFIG. 10 . Further, the band separation of information signals 302, 304, and 308 of theRF MFBMS signal 300 differs from the band separation of the BB/IF MFBMS signal 1104. -
FIG. 11B is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention. With the operations ofFIG. 11B , inboundRF MFBMS signal 300 is down converted by downconversion operations 1122 to perform band conversion, band compression, and band deletion such that not all information signals 302, 304, 306, and 308 signals are present in the inbound BB/IF MFBMS signal 1104. With the example ofFIG. 11B , only information signals 302 and 308 are present in the inbound BB/IF MFBMS signal 1124. Further, as is shown, information signals 302 and 308 in the inbound BB/IF MFBMS signal 1124 reside within a baseband/low IFMFBMS spectrum 1126 that differs from the BB/IF MFBMS spectrum 1006 ofFIG. 10 and the BB/IF MFBMS spectrum 1106 ofFIG. 11A . -
FIG. 11C is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention. With the operations ofFIG. 11C , outbound BB/IF MFBMS signal 1130 is up converted by upconversion operations 1134 to perform band conversion and band expansion such that all information signals 302, 304, and 308 signals are present in the outboundRF MFBMS signal 1136 but have differing frequency separation as compared to the outbound BB/IF MFBMS signal 1130. With the example ofFIG. 11C , information signals 302, 304, and 308 have a first frequency separation in the BB/IF MFBMS spectrum 1132 and a second frequency separation in theRF MFBMS spectrum 310. The first frequency separation differs from the second frequency separation. -
FIG. 11D is a diagram illustrating power spectral densities of a RF MFBMS signal and a BB/IF MFBMS signal constructed and operated on according to one or more embodiments of the present invention. With the operations ofFIG. 11D , outbound BB/IF MFBMS signal 1150 is up converted by upconversion operations 1154 to perform band conversion and band expansion such that all information signals 302, 304, and 308 signals are present in the outboundRF MFBMS signal 1156 but have differing frequency separation therein as compared to the outbound BB/IF MFBMS signal 1150. With the example ofFIG. 11D , information signals 302, 304, and 308 have a first frequency separation in the BB/IF MFBMS spectrum 1152 and a second frequency separation in theRF MFBMS spectrum 310. The first frequency separation differs from the second frequency separation. -
FIG. 12 is a flow chart illustrating receive operations according to the present invention. Particularly,FIG. 12 considers receiveoperations 1200 of a wireless device. Theseoperations 1200 are consistent with the power spectral densities ofFIGS. 10 , 11A, and 11B and with the structure ofFIG. 14 . Theseoperations 1200 commence with the wireless device identifying information signals for receipt that are carried by the RF MFBMS signal (Step 1202). The wireless device then determines the desired BB/IF frequency/frequencies of information signal(s) that will be produced in the BB/IF MFBMS signal (Step 1204). Operation continues with the wireless device determining one or more shift frequencies based upon the operations ofSteps 1202 and 1204 (Step 1206). The reader should understand that the shift frequencies that are applied to the various information signals 302, 304, 306, and 308 of theRF MFBMS signal 300 during subsequent down conversion operations are determined using a number of differing considerations. A first consideration is which of the information signals 302, 304, 306, and/or 308 are desired for receipt by the wireless device. For example, if the wireless device is only currently operating upon a cellular information signal and a WPAN signal, only those two information signals will be used in determining the shift frequencies atStep 1206 even though many other information signals may be available for receipt. Further, the location of the information signals within the BB/IF MFBMS spectrum - For each information signal, an RF receiver section of a wireless device performs down conversion using respective shift frequencies and band pass filters (Step 1208). Operation continues with combining the down converted information signals to form the BB/IF MFBMS signal (Step 1210). The BB/IF MFBMS signal is then optionally filtered at
Step 1212 to remove undesired spectra. Then, the wireless device extracts data from the BB/IF MFBMS signal (Step 1214). - The
operations 1200 ofFIG. 12 differ for each of the illustrated power spectral densities ofFIGS. 10 , 11A, and 11B. With embodiment ofFIG. 10 , the inbound BB/IF MFBMS signal 1004 includes information signals 302, 304, 306, and 308. With the embodiment ofFIG. 11A , the inbound BB/IF MFBMS signal 1104 includes information signals 302, 304, and 308. With the embodiment ofFIG. 11B , the inbound BB/IF MFBMS signal 1124 includes information signals 302 and 308. Thus, theoperations 1200 ofFIG. 12 will be different for the differing power spectral densities illustrated inFIGS. 10 , 11A, and 11B. -
FIG. 13 is a flow chart illustrating transmit operations according to the present invention. In particular,FIG. 13 illustrates transmitoperations 1300 of a wireless device. With a first operation, the wireless device determines RF frequency bands of an RF MFBMS information signal to be formed for transmission (Step 1302). The wireless device then determines BB/IF information signal frequencies of a BB/IF MFBMS signal that will be constructed (Step 1304). As has been previously described, a baseband processing module forms the BB/IF MFBMS signal. In some operations it may be desirable for all of the information signals present in the BB/IF MFBMS signal to be band expanded, ordered in a particular spectral fashion, have particular spectral separation, or otherwise particularly formed for desired operations. The RF MFBMS signal has requirements for placement of the information signals with a corresponding RF MFBMS spectrum, as determined by one or more operating standards. - Next, the wireless device determines a plurality of shift frequencies based upon the operations of
Steps 1302 and 1304 (Step 1306). Operation continues with the baseband processing module of the wireless device modulating data to create the BB/IF MFBMS signal (Step 1310). The transmitter section of the wireless device then up converts each information signal of the BB/IF MFBMS signal by a respective shift frequency (Step 1312). The transmitter section then combines the up converted information signals to form the RF MFBMS signal (Step 1314). The transmitter section then filters/amplifies the RF MFBMS signal to remove undesired spectral (Step 1316). Then, the wireless device transmits the RF MFBMS signal (Step 1318). - The
operations 1300 ofFIG. 13 differ for the illustrated power spectral densities ofFIGS. 10 , 11C, and 11D. With particular reference toFIG. 10 , the BB/IF MFBMS signal 1004 includes information signals 302, 304, 306, and 308. With the embodiment ofFIG. 11C , the outbound BB/IF MFBMS signal 1130 includes only information signals 302, 304, and 308. With the embodiment ofFIG. 11D , the outbound BB/IF MFBMS signal 1150 includes only information signals 302, 304, and 308. However, the RF MFBMS signals 1136 and 1156 ofFIGS. 11C and 11D , respectively, differ. The RF MFBMS signals 1136 and 1156 ofFIGS. 11C and 11D not only have differing spectral positions of information signals 302, 304, and 308 but have differing frequency separations as well. Thus, theoperations 1300 ofFIG. 13 will be different for the differing power spectral densities illustrated inFIGS. 10 , 11C, and 11D. -
FIG. 14 is a block diagram illustrating a receiver section of a wireless device constructed according to one or more embodiments of the present invention. The particular receiver section ofFIG. 14 may execute the operations of 1200 ofFIG. 12 and the operations corresponding toFIGS. 10 , 11A, and 11B. Thereceiver section 252 includes a plurality of receive paths each of which couples to receive the RF MFBMS signal fromantenna 1400. In other embodiments, additional antennas may be employed. A first receive path includes LNA 1402A, filter 1404A, mixer 1406A, and filter 1408A. A second receive path includesLNA 1402B, filter 1404B,mixer 1406B, and filter 1408B. A third receive path includesLNA 1402C, filter 1404C,mixer 1406C, and filter 1408C. An Nth receive path includesLNA 1402N, filter 1404N,mixer 1406N, and filter 1408N. - Each of these receive paths down converts the RF MFBMS signal by a respective shift frequency, e.g., FS1, FS2, FS3, and FSN, to produce a respective BB/IF information signal component and may also filter such BB/IF information signal component.
Summer 1410 sums the outputs of each of the receive paths to produce the BB/IF MFBMS signal. The output ofsummer 1410 is digitized byADC 1412 and produced tobaseband processing module 260 for an extraction of data there from. Each of the components of thereceiver section 254 may be frequency adjusted based upon BB/IF and RF frequencies of corresponding information signals upon which the particular path operates. - For example, referring to the spectrum of
FIG. 10 , each of the receive paths would operate upon acorresponding information signal FIG. 11A , since only threeinformation signals FIG. 14 would be required. Referring to the embodiment ofFIG. 11B , since only twoinformation signals IF MFBMS signal 1124 produced, only two receive paths of the structure ofFIG. 14 would be required. -
FIG. 15 is a block diagram illustrating a transmitter section of a wireless device constructed according to one or more embodiments of the present invention. Thetransmitter section 254 produces anRF MFBMS signal 300 according to one or more ofFIGS. 10 , 11C or 11D, for example. Thetransmitter section 254 includes a plurality of transmit paths. Each transmit path includes at least a filter, a mixer and an optional filter. For example, a first transmit path includesfilter 1504A,mixer 1506A, and optional filter 1508A. Likewise, a second transmit path includesfilter 1504B, mixer 1506B, andoptional filter 1508B. The third transmit path includesfilter 1504C,mixer 1506C, andoptional filter 1508C. Further, the Nth transmit path includesfilter 1504N,mixer 1506N, andoptional filter 1508N. - According to the structure of
FIG. 15 , a single digital analog converter (DAC) 1502 produces an analog representation of the BB/IF MFBMS signal that includes a plurality of information signals. The output of theDAC 1502 is received by each of the transmit paths, each of which creates a respective component of an RF MFBMS signal.Sumer 1510 sums each of the components of the RF MFBMS signal to produce the RF MFBMS signal toantenna 1500. Eachmixer DAC 1502 by a respective shift frequency, FS1, FS2, FS3, and FSN, respectively. After up sampling, each of the transmit paths produces a corresponding information signal in the RF MFBMS spectrum. Combining of these components by the combiner/summer 1510 produces the RF MFBMS signal. Power Amplifier (PA) 1512 amplifies the RF MFBMS signal, which couples the signal toantenna 1500. - According to one aspect of the structure of
FIG. 15 , thefilters FIG. 11C , a first transmit path that includesfilter 1504A may perform band pass filtering upon information signal 302 of a corresponding BB/IF MFBMS signal. Likewise, a second transmit path of thetransmitter section 254 may includefilter 1504B that is set to band pass filter information signal 304 andband pass filter 1504C of a third transmit path is set to band passfilter information signal 308. These principles may be further extended to apply to the other components of thetransmitter section 254. Further, filters 1508A, 1508B, 1508C, and 1508N may be tuned to band pass filter the corresponding RF information signals. -
FIG. 16 is a block diagram illustrating a transmitter section of a wireless device constructed according to another embodiment of the present invention. Thetransmitter section 254 ofFIG. 16 differs from the transmitter section illustrated inFIG. 15 but performs similar operations. With the structure ofFIG. 16 , thebaseband processing module 260 produces respective digitized information signals of a BB/IF MFBMS signal to a plurality of transmit paths. A first transmit path that receives a first information signal of the BB/IF MFBMS signal converts the first information signal component to an analogsignal using DAC 1602A. The output ofDAC 1602A is filtered byfilter 1604A, up converted by mixer 1606A based upon a particular shift frequency, and optionally filtered byfilter 1608A. Likewise, the second transmit path includesDAC 1602B, filter 1604B,mixer 1606B, and filter 1608B and operates upon a second information signal. A third transmit path includesDAC 1602C, filter 1604C,mixer 1606C, and filter 1608C and operates upon a third information signal. Finally, the Nth transmit path includesDAC 1602N, filter 1604N,mixer 1606N, and filter 1608N and operates upon an Nth information signal. Each of the transmit paths of thetransmitter section 254 produces a respective component of the RF MFBMS signal.Summer 1610 sums the outputs of each of the transmit paths to construct the RF MFBMS signal, which includes the plurality of information signals each residing within respective positions of the RF MFBMS spectrum. Combining of these components by the combiner/summer 1510 produces the RF MFBMS signal. Power Amplifier (PA) 1612 amplifies the RF MFBMS signal, which couples to signal toantenna 1600. - The terms “circuit” and “circuitry” as used herein may refer to an independent circuit or to a portion of a multifunctional circuit that performs multiple underlying functions. For example, depending on the embodiment, processing circuitry may be implemented as a single chip processor or as a plurality of processing chips. Likewise, a first circuit and a second circuit may be combined in one embodiment into a single circuit or, in another embodiment, operate independently perhaps in separate chips. The term “chip,” as used herein, refers to an integrated circuit. Circuits and circuitry may comprise general or specific purpose hardware, or may comprise such hardware and associated software such as firmware or object code.
- The present invention has also been described above with the aid of method steps illustrating the performance of specified functions and relationships thereof. The boundaries and sequence of these functional building blocks and method steps have been arbitrarily defined herein for convenience of description. Alternate boundaries and sequences can be defined so long as the specified functions and relationships are appropriately performed. Any such alternate boundaries or sequences are thus within the scope and spirit of the claimed invention.
- The present invention has been described above with the aid of functional building blocks illustrating the performance of certain significant functions. The boundaries of these functional building blocks have been arbitrarily defined for convenience of description. Alternate boundaries could be defined as long as the certain significant functions are appropriately performed. Similarly, flow diagram blocks may also have been arbitrarily defined herein to illustrate certain significant functionality. To the extent used, the flow diagram block boundaries and sequence could have been defined otherwise and still perform the certain significant functionality. Such alternate definitions of both functional building blocks and flow diagram blocks and sequences are thus within the scope and spirit of the claimed invention. One of average skill in the art will also recognize that the functional building blocks, and other illustrative blocks, modules and components herein, can be implemented as illustrated or by discrete components, application specific integrated circuits, processors executing appropriate software and the like or any combination thereof.
- As may be used herein, the terms “substantially” and “approximately” provides an industry-accepted tolerance for its corresponding term and/or relativity between items. Such an industry-accepted tolerance ranges from less than one percent to fifty percent and corresponds to, but is not limited to, component values, integrated circuit process variations, temperature variations, rise and fall times, and/or thermal noise. Such relativity between items ranges from a difference of a few percent to magnitude differences. As may also be used herein, the term(s) “coupled to” and/or “coupling” and/or includes direct coupling between items and/or indirect coupling between items via an intervening item (e.g., an item includes, but is not limited to, a component, an element, a circuit, and/or a module) where, for indirect coupling, the intervening item does not modify the information of a signal but may adjust its current level, voltage level, and/or power level. As may further be used herein, inferred coupling (i.e., where one element is coupled to another element by inference) includes direct and indirect coupling between two items in the same manner as “coupled to.” As may even further be used herein, the term “operable to” indicates that an item includes one or more of power connections, input(s), output(s), etc., to perform one or more its corresponding functions and may further include inferred coupling to one or more other items. As may still further be used herein, the term “associated with,” includes direct and/or indirect coupling of separate items and/or one item being embedded within another item. As may be used herein, the term “compares favorably,” indicates that a comparison between two or more items, signals, etc., provides a desired relationship. For example, when the desired relationship is that signal 1 has a greater magnitude than signal 2, a favorable comparison may be achieved when the magnitude of signal 1 is greater than that of signal 2 or when the magnitude of signal 2 is less than that of signal 1.
- The present invention has also been described above with the aid of method steps illustrating the performance of specified functions and relationships thereof. The boundaries and sequence of these functional building blocks and method steps have been arbitrarily defined herein for convenience of description. Alternate boundaries and sequences can be defined so long as the specified functions and relationships are appropriately performed. Any such alternate boundaries or sequences are thus within the scope and spirit of the claimed invention.
- Moreover, although described in detail for purposes of clarity and understanding by way of the aforementioned embodiments, the present invention is not limited to such embodiments. It will be obvious to one of average skill in the art that various changes and modifications may be practiced within the spirit and scope of the invention, as limited only by the scope of the appended claims.
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Also Published As
Publication number | Publication date |
---|---|
HK1149650A1 (en) | 2011-10-07 |
CN101877596B (en) | 2013-08-14 |
EP2246986A2 (en) | 2010-11-03 |
US20140071923A1 (en) | 2014-03-13 |
US9258100B2 (en) | 2016-02-09 |
TWI493891B (en) | 2015-07-21 |
CN101877596A (en) | 2010-11-03 |
EP2246986A3 (en) | 2014-04-30 |
TW201132001A (en) | 2011-09-16 |
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