Power Allocation by PSO in MAC

摘要

The capacity of Additive White Gaussian Noise (AWGN) Multiple Access Channel (MAC) can be approached by means of power allocation. The MAC can be regarded as single user multiple level coding and modulation system by applying pulse amplitude modulation to the individual signal and superimposing the weighted signal. Sigma mapping is applied such that the mutual information is as close as possible to the channel capacity. In the design of sigma mapping, every individual signal is weighted by the appropriate power which is optimized by means of Particle Swarm Optimization (PSO). In the respect of approaching MAC capacity and computational complexity, the proposed optimization method is superior to that of Interior Point Method (IPM) and differential evolution. The optimized power can facilitate approaching MAC capacity in practical communication system.