Hybrid genetic algorithm based detection schemes for synchronous CDMA systems
K. Yen, L. Hanzo · 2002
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.