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Combined Power Control and Space-Time Diversity (ISR IP)
ISR intellectual property available to license
U.S. Patent 6,377,812
In the uplink, mobile powers and equalization/diversity combining vectors at 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 set to a specified value. 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 algorithms achieve the optimal solution for the uplink that minimizes the mobile power, and achieves a feasible solution for the downlink.
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June 17, 2007