| Iterative Multiuser Receiver Based on Factor Graph for Asynchronous Coded CDMA Systems |
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| 作者姓名： | 张爱萍 Luo Hanwen Wang Haoxing |
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| 作者单位： | DepartmentofElectronicEngineering,ShanghaiJiaotongUniversity,Shanghai200030,P.R.China |
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| 基金项目： | the National Science Foundation of China and Key Subject Project of the Ministry of Education. |
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| 摘 要： | Factor graph,so named because it graphically represents function factorization,with which and its sum-product algorithm the iterative algorithm can be derived clearly.An iterative multiuser receiver based on factor graph for asynchronous coded CDMA system is proposed.In this paper,the a posteriori probability of users information bits conditioned on the noise-whitening filters output is represented by factor graphs,after numbers of iterations with the sum-product algorithm the information bits are estimated.The authors also propose a reduced complexity algorithm.Simulation results show that with this proposed receiver,near-single-user performance can be achieved,and small performance degradation for the reduced complexity algorithm with significant complexity reduction.
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| 关 键 词： | 异步编码 无线通信系统 码分多址 CDMA 迭代算法 商群 重复多用户接收机 |
Iterative Multiuser Receiver Based on Factor Graph for Asynchronous Coded CDMA Systems |
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| Luo Hanwen,Wang Haoxing.Iterative Multiuser Receiver Based on Factor Graph for Asynchronous Coded CDMA Systems[J].High Technology Letters,2003,9(1):41-46. |
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| Authors: | Luo Hanwen Wang Haoxing |
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| Abstract: | Factor graph, so named because it graphically represents function factorization, with which and its sum-product algorithm the iterative algorithm can be deri ved clearly. An iterative multius-er receiver based on factor graph for asynchronous coded CDMA system is proposed. In this paper, the a posteriori probability of users information bits conditioned on the noise-whitening filters output is represented by factor graphs, after numbers of iterations with the sum-product algorithm the information bits are estimated. The authors also propose a reduced complexity algorithm. Simulation results show that with this proposed receiver, near-single-user performance can be achieved, and small performance degradation for the reduced complexity algorithm with signifi-cant complexity reduction. |
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| Keywords: | multiuser detection iterative algorithm multiuser decoding |
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