MAP demodulator for time-selective fading CDMA channels

A decision-feedback MAP receiver for time-selective fading CDMA channels is proposed. The receiver consists of a sequence-matched filter and a MAP demodulator. Output samples from the matched filter are fed into the MAP demodulator. The MAP demodulator exploits the channel memory by delaying the decision and using a sequence of observations. This receiver also rejects multiple access interference (MAI) and estimates channel fading coefficients implicitly to give good demodulation decisions. Moreover, computer simulations are performed to evaluate the BER performance of the receiver under various channel conditions