CDMA: principles of spread spectrum communication
CDMA: principles of spread spectrum communication
Multiuser Detection
Genetic Algorithms in Search, Optimization and Machine Learning
Genetic Algorithms in Search, Optimization and Machine Learning
Iterative decoding for MIMO channels via modified sphere decoding
IEEE Transactions on Wireless Communications
Genetically modified multiuser detection for code division multiple access systems
IEEE Journal on Selected Areas in Communications
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Multicode system is designed to get more spreading sequences and get higher multiplexing capacity in large-area-synchronized code division multiple access (LAS-CDMA) system. The computational complexity is too high for the optimum detection algorithm using maximum-likelihood (ML) rule and the genetic algorithm (GA) method is often applied to get the suboptimum solution since it is able to greatly decrease the detection complexity. Another sphere decoding (SD) algorithm can also independently reach a near-optimum solution due to a constrained searching operation. A modified detection algorithm based on genetic algorithm method is proposed, where sphere decoding is an additional embedded operation for each GA iteration. The simulation results shows that a SDassisted GA detector can obtain the same performance as that of the classic GA detector with fewer iterations.