An adaptive diversity receiver architecture

摘要

A diversity receiver circuit that adaptively selects a variable number of one or more antennas for use in improving signal quality. Each antenna is provided its own receiver that each generates a representation of a received signal. The first and second representations of the signal are adaptively phase shifted only if both have sufficient strength. Otherwise only one of the processed first and second representations are selected for further processing. This adaptive selection offers high dynamic adaptability in using the appropriate antennas and receivers at the appropriate time to thereby improving signal-to-noise ratio. The receivers may be direct conversion receivers that implement up-conversion of the baseband signal to reduce DC offset and 1/f noise characteristic of direct conversion architectures. <IMAGE>