Choice of Appropriate Space-Time Coding Scheme for MIMO Systems Employing Channel Coding under BICM

Abstract

We consider the use of MIMO structures in the fourth generation of cellular networks. We contrast the performances of the two general categories of orthogonal and non-orthogonal space-time schemes while considering a relatively simple iterative detector for the latter case. We show that with perfect channel knowledge, a substantial gain is obtained by using appropriate non-orthogonal schemes, which justifies the increased receiver complexity. The gain is more considerable for a larger number of transmit antennas. This conclusion remains true when channel estimation at receiver is not perfect