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Transmit Power Optimization in Cooperative Distributed Antenna System Using Convex Optimization Technique

A.Suban, R.Ann Caroline Jenifer

In this paper, a transmit beamforming technique with minimum total weighted transmit power and threshold SINR constraint using convex optimization is presented for the efficient performance of Distributed Antenna System (DAS). The problem is investigated under both sum-power constraint and per-antenna power constraint. An optimized value of the weight vector for the frequency flat quasi-static channel is found using convex optimization technique. Two different cases- Orthogonal channels and highly correlated channels are discussed. Simulation results show that the performance of DAS with per-antenna power constraint is much efficient than the sum-power constraint and also it proves the efficiency of using beamforming with convex optimization technique.