Patent ID: 7167716

Claim:
A synchronous demodulation apparatus of a base transceiver station in a communication system, comprising: a first synchronous demodulation unit for receiving received signals each of which includes a pilot channel signal and a traffic channel signal, demodulating the received signals to generate demodulated signals, and outputting the demodulated user signals; a channel estimation unit for estimating channel parameters for each of the mobile stations based on the pilot channel signals transmitted from the mobile stations, and generating estimated channel parameters; a received signal delay unit for delaying the received signal and outputting a delayed signal which is delayed in one symbol from the received signal; an interference signal regeneration unit for generating interference signals based on the demodulated user signals and the estimated channel parameters, removing interference signals from the delayed signals, and outputting interference-cancelled-signals in which the interference signals are removed; and a second synchronous demodulation unit for demodulating the interference-cancelled-signals and outputting demodulated signals, wherein each of the channel parameters includes an amplitude distortion and a phase distortion.