A multipath transmission diversity scheme using prediction-based transmitter filter in FDD-CDMA systems

A multipath transmission diversity scheme using predictive transmitter filter in the frequency division duplex-code division multiple access systems (FDD-CDMA) is introduced over a multipath fading channel. A transmitter filter is added in the transmitter, while a Rake combiner is used in the receiver. To design the transmitter filter at the base station for the current slot, we utilize the downlink channel impulse response (CIR) of the previous slots. It is assumed that the downlink CIR is transmitted from the mobile terminal to the base station. In addition, to compensate inherent feedback delays occurring during the transmission of channel information from mobile terminal to the base station, the channel prediction is utilized. Results show that the new scheme can significantly improve the output signal to noise ratio (SNR) compared with conventional Rake receiver