Patent ID: 8218678

Claim:
A Digital Pre-Distortion (DPD) power amplifier apparatus of a transmission end comprising a plurality of transmission paths in a multiple antenna wireless communication system, the apparatus comprising: a plurality of amplifiers for amplifying an input signal directed to each of the transmission paths; a plurality of couplers for coupling amplified signals on respective transmission paths; a switch for outputting at least one of the amplified signals coupled on the respective transmission paths; a shared feedback path for providing the amplified signal output from the switch to a plurality of processors; a controller that is configured to output a reference signal to each of the transmission paths in order to determine a feedback path gain comprising a path gain from an input terminal of a coupler on each transmission path to a feedback input terminal of a respective processor; and the plurality of processors for comparing a feedback signal provided through the shared feedback path with the input signal and for pre-distorting the input signal such that the input signal and the amplified signal are linear with each other.