A novel multipath diversity scheme in TDD-CDMA systems

A novel multipath diversity scheme used in TDD-CDMA systems is presented. A FIR filter is added in the transmitter while a RAKE combiner is used in the receiver. The optimum FIR filter problem may be viewed as an eigenvalue problem. The multiple antennas system is also analyzed. Results show that this new scheme can greatly improve the output signal to noise ratio (SNR) compared with conventional RAKE receiver or pre-RAKE diversity system.