Performance Analysis Of SSK and Trellis Coded Spatial Modulation In MIMO

Abstract

Multiple antennas in wireless system offer a practical way to extend next generation communication capabilities. Spatial modulation (SM) in which multiple antennas are used to convey information besides the conventional M-array signal constellations, In a new MIMO(Multiple Input Multiple Output) transmission technique, which has recently been proposed as an alternative to V-BLAST(Vertical Bell Labs Layered Space Time) .In this scheme, a trellis encoder and an SM mapper are jointly designed to take advantage of the benefits of both spatial modulation with trellis coding (SM-TC) and space shift keying (SSK) A pair wise error probability (PEP) upper bound is determined for the SM-TC scheme in uncorrelated quasi-static Rayleigh fading channels and it has been compared with Trellis code spatial modulation. Also we illustrate SSK’s strength by studying its interaction with the fading channel. We obtain tight upper bounds on bit error probability performance gains over APM systems (3 dB at a bit error rate of 10⁻⁵), making SSK an interesting candidate for future wireless applications. The SM-TC schemes achieve significantly better error performance than the classical space-time trellis codes and coded V-BLAST systems at the same spectral efficiency, yet with reduced decoding complexity.