Near maximum likelihood detection schemes based on RD algorithm for MIMO systems

In this paper, we a propose near maximum-likelihood detection (MLD) scheme for multiple-input multiple-output antenna systems over flat fading channels. The new scheme is based on utilizing an initial estimate of the received symbol and discriminate the reliability of the estimated symbol with RD algorithm. If the reliability of the estimated symbol is low, we make a candidate subset of the upper and lower bounds derived from RD algorithm, and then search for the most reliable symbol. The proposed schemes have proved to significantly reduce computational complexity in simulation.

1. INTRODUCTION

Recently, the application of multiple input-multiple output (MIMO) antenna systems and space-time signal processing techniques to wireless communication systems has been getting attention by many researchers. In an independent Rayleigh scattering environment, multiple antenna systems provide enormous increase in spectral efficiency compared to single antenna systems [1], [2].