Patent ID: 8050640
Filing Date: 2011-11-01
Classification: H04B

Abstract:
1. An antenna diversity system, comprising: a plurality of antennas, each antenna providing a respective antenna signal; a receiver portion arranged to process each respective antenna signal and generate a set of channel signals; signal strength circuitry for determining a respective power level for each channel signal and for generating a scaling factor for each channel from each of the respective power levels; scaling circuitry arranged to multiply each channel signal by its respective scaling factor to generate a respective scaled channel signal; a phase estimator arranged to determine a reference phase according to the power levels and to measure a phase difference between channel signals and the reference phase; a phase rotator operating as an open loop circuit and arranged to rotate the phase of at least one of the channel signals according to the measured phase difference; and summing circuitry arranged to combine the rotated channel signal with at least one other channel signal.