Patent ID: 7382841

Claim:
An orthogonal frequency division multiplexing (OFDM) receiver comprising: at least four antennas to receive an OFDM modulated high frequency signal; a plurality of OFDM demodulators each configured to receive a respective time domain baseband signal generated based on the high frequency signal and to output a respective frequency domain baseband signal, wherein each OFDM demodulator is coupled to a respective antenna group, each antenna group containing at least two of the at least four antennas; a first phase shifter for each antenna group each having a first input coupled to the second antenna of each antenna group, an output of each first phase shifter and an output of the first antenna of each antenna group being combined in a respective one of a plurality of first adders to provide the respective time domain baseband signal to each of the OFDM demodulators; a first control circuit for each antenna group each coupled to an output of the respective one of the plurality of first adders and to a second input of each first phase shifter; a second phase shifter having a first input coupled to an output of a second OFDM demodulator that is different from a first OFDM demodulator among the OFDM demodulators; a second control circuit coupled to an output of the plurality of OFDM demodulators and to a second input of the second phase shifter; a second adder coupled to an output of the second phase shifter and an output of the first OFDM demodulator, wherein a signal is diversity-synthesized by the first phase shifters until the respective time domain baseband signal is inputted to each of the OFDM demodulators, and the frequency domain baseband signal output by the second OFDM demodulator is diversity-synthesized by the second phase shifter.