CDMA移动通信系统中的分组并行多用户信号检测器
A GROUPED PARALLEL MULTIUSER DETECTOR FOR CDMA MOBILE COMMUNICATIONS
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摘要: 该文提出了一种新的分组并行多用户信号检测器结构,推导了这种多用户信号检测器的检测算法,算法的计算复杂度与用户数呈线性关系,而性能优于解相关检测器,检测器的总延时小于判决反馈多用户信号检测器。数值及仿真结果表明,当接收到的干扰信号功率高于有用信号:3dB以上时,分组并行多用户信号检测器的误码性能趋于某一值,因而该检测器可以有效地克服CDMA移动通信中的远近效应。
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关键词:
- 码分多址联结; 多用户检测; 抗远近效应
Abstract: A new grouped parallel multiuser detector is proposed and the corresponding algorithm is derived in this paper. The complexity of this detector is linear to the number of users and the performance is better than the decorrelating detector. The detection s delay is smaller than the decision-feedback detector. Numerical and simulation results show that the bit error rate (BER) of the grouped parallel multiuser detector approaches some value when the multiple access interference (MAI) power is 3dB higher than the useful signal power, so this detector can resist near-far effect efficiently for CDMA mobile communications. -
S. Verdn Mininmm probability oferrorfor asynchronous Gaussian multiple-access chanmels IEEETrans. on IT, 1986, IT-32(1), 85-96.[2]R. Lupas, S. Verdu, Linear multiuser det ect ors for synchronous code-division multilple-accesschannels, IEEE Trans. on IT. 1989, IT-35(1), 123-136.[3]R. Lupas, S. Verdn, Near-far resistance of multiuser detect ors in asynchronous channels. IEEETrans. on Commun. 1990, COM-38(4), 496-508.[4]Z. Xie, R. T. Short, C. K. Rushfrot h, A family of suboptimum detectors for coherent multiuserrommunications, IEEE J. on SAC, 1990, 8(4), 683-690.[5]M.K. Varanasi, B. Aazhang, Multistage detection in asynchronous code-division multiple-access communicaltions, IEEE Trans. on Conmun., 1990, 38(4), 509-519.[6]M.K. Varanasi, B. Aazhang, Near-optinnm detection in synchronous code-division multiple-access system, IEEE Trans. on Commun., 1991, COM-39(5), 725-736.[7]A. Duel-Hallen, Decorrelating decision-feedback nultiuser detector for synchronous code-divisionmultiple-access channel, IEEE Trans. on Commun., 1993, COM-41(2), 285-290. -
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