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Multi-User Detector Based on Gram-Schmidt Algorithm
Ren Pinyi,Zhu Shihua,Wang Yonggang
(School of Electronics and Information Engineering,XI'an Jiaotong University,Xi'an 710049,China)
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Abstract: A multiple access interference(MAI)cancellation algorithm employing Gram-Schmidt algorithm for code division multiple access(CDMA) systems is presented. Unlike the conventional multiuser detector where the spreading sequence is used to despread the multiuser signals, the new detector uses an optimal despreading sequence locally generated by Gram-Schmidt algorithm to despread the received singals, making the multiple access interference fully suppressed. Analysis and simulation show that this algorithm can effectively cancel MAI and improve the bit error rate(BER) performance of the CDMA systems.
Keywords: code division multiple access(CDMA);multiple access interference(MAI);Gram-Schmidt algorithm