Performance enhancement in MIMO self-encoded spread spectrum systems by using multiple codes

Self-encoded spread spectrum (SESS) is a novel modulation technique that acquires its spreading sequence from the randomness of the input data stream. In recent work, we incorporated SESS into MIMO system and showed that the system can achieve diversities in both time and space domains. In this paper, we propose a novel multi-code MIMO-SESS system that not only can achieve spatial and temporal diversities, but also can double the throughput compared with previous scheme. Simulation results demonstrate that the performance of the proposed multi-code MIMO-SESS system achieves about 6 dB of gain at 10^-4 BER from the combined time and spatial diversities over an Alamouti scheme-based MIMO system under Rayleigh fading channels.