Multiuser Detection Using a Hopfield Network for Asynchronous Code-Division Multiple-Access Systems

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Copyright notice. c1996 IEICE All rights reserved.　"Multiuser Detection Using a Hopfield Network for Asynchronous Code-Division Multiple-Access Systems"Teruyuki MIYAJIMA,Takaaki HASEGAWA.　IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences , 1996 Vol.E79-A No.12 pp. 1963-1971 許諾No.07RB0055.In this paper, a multiuser receiver using a Hopfield network (Hopfield network receiver) for asynchronous codedivision multiple-access systems is proposed. We derive a novel likelihood function for the optimum demodulation of a data subsequence whose length is far shorter than that of the entire transmitted data sequence. It is shown that a novel Hopfield network receiver can be derived by exploiting the likelihood function, and the derived receiver leads to a low complexity receiver. The structure of the proposed receiver consists of a bank of correlators and a Hopfield network where the number of units is proportional to both the number of users and the length of a data sequence demodulated at a time. Computer simulation results are presented to compare the performance of the proposed receiver with those of the conventional multiuser detectors. It is shown that the proposed receiver significantly outperforms the correlation receiver, decorrelating detector and multistage detector, and provides suboptimum performance.
社団法人電子情報通信学会の論文
1996-12-25