Analysis of semidefinite relaxation detector in MIMO channel

Abstract

Communication techniques based on multiple-input multiple-output (MIMO) have been increasingly exploited in order to obtain communication systems with high capacity and throughput, against the scenario of increasing scarcity of spectrum. In this context, the semidefinite relaxation (SDR) based-signal detector has attracted enormous interest. The sub-optimal SDR detection strategy is very promising due to its very near-optimal maximum-likelihood (ML) performance combined with polynomial time complexity cost. This work analyzes the SDR detector under MIMO channels, considering its robustness to imperfect channel coefficients estimation, as well as its performance under antenna selection technique.