A data encoding scheme maps a set of data to a number of spectral components, each component having an amplitude, a phase and a unique frequency. From these mapped tones, an analog baseband signal can be formed, which, when implemented in a data transmission scheme, can realize much higher throughput...http://www.google.ca/patents/US7039243?utm_source=gb-gplus-sharePatent US7039243 - Spectral encoding of information
