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A joint power control and space-time diversity scheme is proposed for the uplink and downlink. In the uplink, mobile power and equalization/diversity combining vectors at the base stations are calculated jointly. The mobile transmitted power is minimized while the signal to noise ratio (SNR) at each link is maintained above a threshold. A multitap transmit diversity scheme for the downlink is also proposed where the transmit weight vectors are adjusted such that the SNR at each mobile is greater than a threshold. The proposed transmit and receive diversity combining schemes can be applied to networks with fading channels and in cases where the number of cochannels and multipaths are larger than the number of antenna elements. The proposed algorithm achieves the optimal solution for the uplink that minimizes the mobile power, and achieves a feasible solution for the downlink if any exists.
Rashid-Farrokhi et al. (Fri,) studied this question.
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