Apparatus and methods efficiently estimate signal-to-noise ratios of a received signal irrespective of intentional adjustments to transmitting power due to fluctuating data rates. For example, in one embodiment, the variation in power due to the change in data rate is decoupled from environmental sources...http://www.google.ca/patents/US20060093026?utm_source=gb-gplus-sharePatent US20060093026 - Method and system for power control in a communication system
