Patent ID: 9521622
Filing Date: 2016-12-13
CPC Classification: H04W,Y02D

Claim Text:
1. A wireless communication system comprising: a base station comprising a plurality of precoders, wherein the base station receives a plurality of input signals that are selectively provided to the plurality of precoders, the plurality of precoders preforms precoding operations on the plurality of input signals and outputs a first output signal, the base station comprises at least two separate algorithms, wherein a first algorithm minimizes total transmit power per antenna under signal to interference and noise ratio (SINR) target constraints, and a second algorithm maximizes an SINR under a sum power constraint per data stream; wherein each of the at least two separate algorithms is to determine a power allocation and obtain a plurality of efficient precoders; wherein the each of the at least two separate algorithms iteratively update downlink power allocation, downlink beamformers, uplink power allocation, a plurality of Lagrange multipliers, and uplink beamformers, and the each of the at least two separate algorithms stops when the downlink power allocation and uplink receive beamformers converge wherein the downlink power allocation is calculated by further minimizing a sum power with per-antenna power constraints of the base station with the SINR targets.