Hybrid genetic algorithm based detection schemes for synchronous CDMA systems

We applied a hybrid genetic algorithm (GA) scheme as a suboptimal multiuser detection technique in bit-synchronous code division multiple access (CDMA) systems over a Gaussian channel as well as over a single-path Rayleigh fading channel. The proposed hybrid GA scheme attempts to search for the users´ transmitted bit sequence that optimizes the correlation metric employed. Simulation results showed that the BER performance of our proposed multiuser detector approaches the single-user performance bound, while imposing a lower complexity as compared to that of the optimum multiuser detection, especially for a high number of users. Furthermore, the parameters of the hybrid GA scheme can be adjusted, in order to attain a tradeoff between the computational complexity, BER performance and the detection time