Performance improvement of chaos MIMO scheme using advanced stochastic characteristics

Abstract

Chaos multiple-input multiple-output (C-MIMO) is a transmission scheme that uses Gaussian signal transmission based on chaos, where physical-layer security and channel coding effect are obtained. However, because the Gaussian signals are generated according to the principle of central limit theorem, about ten independent chaos signals are needed, resulting in increased calculation complexity. In addition, the probability density function of the phase of transmit signals slightly deviates from uniform distribution, which degrades the bit error rate (BER) performance. Therefore, we propose a C-MIMO scheme with improved Gaussian modulation, in which the stochastic characteristic is improved by applying the Box–Muller method with only one chaos signal.