Diversity transmission and adaptive MLSE for digital cellular radio

Adaptive equalization at the mobile in conjunction with diversity transmission at the base station can combat the adverse effects of both frequency-selective and frequency-nonselective fading at the mobile receiver. This is suggested as an alternative to diversity combining at the mobile. Thus, a substantial saving in the mobile receiver's implementation cost and power consumption is expected. In this paper, a time-domain multiple access system with two transmitting antennas at the base station and maximum-likelihood sequence estimation at the mobile is considered. Per-survivor processing (PSP), a combined channel-tracking and sequence-estimation algorithm, has been used for improving the system performance. System performance results in the presence of severe Doppler frequency shifts and additive white Gaussian noise in a flat fading channel are presented. The computational complexity and acquisition capabilities of the PSP algorithm are also presented.