Abstract
Self-encoded spread spectrum (SESS) is a novel modulation technique that acquires its spreading sequence from the randomness of an input data stream rather than through the use of the traditional pseudo-random (PN) code generator. The statistical properties of random codes in SESS offer a number of advantages over the deterministic PN codes. In this paper we propose a multiple-input multiple-output (MIMO) SESS system that employs iterative detection to exploit the inherent time diversity in SESS modulation. Alamouti scheme-based spacetime block coded MIMO technique is used to exploit the spatial diversity. The simulation results demonstrate that the proposed system can completely mitigate the fading effect to achieve about 7.5 dB of gain over a PN-coded spread spectrum MIMO system in Rayleigh fading channels.
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