Patent ID: 7027491

Claim:
A receiver of a Code Division Multiple Access (CDMA) system employing a multiple access interference (MAI) cancellation apparatus, comprising: the MAI cancellation apparatus comprising: demodulating means for receiving a residual signal or a received signal from a calling terminal as a baseband spread signal on an over-sample basis and down-sampling the baseband spread signal from the over-sample basis to a chip basis to thereby output a demodulation signal; regenerating means for performing a bit decision for the demodulation signal, regenerating signals through the channelization and scrambling, and converting the regenerated signals to signals on the over-sample basis and the chip basis; adding means for summing up the signals on the over-sample basis; pulse shaping filtering means for filtering the summed-up signal to thereby output a band spread signal; subtracting means for receiving the received signal and subtracting the band spread signal from the received signal to thereby output the residual signal; and delay means for keeping timing with the residual signal by delaying, on the chip basis, the signals outputted from the regenerating means, wherein the MAI cancellation apparatus generates the demodulation signal by summing up the residual signal down-sampled on the chip basis at the demodulating means and the signals on the chip basis outputted from the delay means.