一種部分并行干擾對消因子的計(jì)算方法
A calculating method for partial parallel interference cancellation factor
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摘要: 在CDMA系統(tǒng)中，多用戶檢測是一種行之有效的方法。而具有部分干擾因子的并行干擾抵消檢測器則是目前多用戶檢測技術(shù)中最簡單、有效的接收機(jī)，但長期以來，部分干擾因子的確定大多根據(jù)實(shí)驗(yàn)，缺乏理論支持。該文在基于MMSE準(zhǔn)則下，給出了一個(gè)兩級PPIC接收機(jī)的部分干擾因子的計(jì)算公式。計(jì)算機(jī)仿真表明它具有良好的干擾消除能力，且對干擾信號功率和噪聲估計(jì)偏差不敏感。
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關(guān)鍵詞:
- 多用戶檢測; 最小均方誤差; 并行干擾對消; 部分對消因子
Abstract: Multiuser detection in Code-Division Multiple Acess(CDMA) system is an effective method. The Partial Parallel Interference Cancellation(PPIC) detector is considered as an effective yet simple receiver. However, the optimal cancellation level which is controlled by Partial Cancellation Factor(PCF) is usually determined by trial and error, since no theoretical values were reported. A multiuser receiver employing two-stage PPIC based on MMSE criteria is introduced in this paper. Computer simulation shows that the derived PCF is insensitive u the estimation bias of the noise level and the interfering signal power. -
M.K. Varanasi, B, Aazhang, Multistage detection in asynchronous code-division multiple-access communications, IEEE Trans. on Communications, 1990, 38(4), 509-519.[2]A. Kaul, B. D. Woerner, Analytic limits on performance of adaptive multistage interference cancellation for CDMA, IEE Electronics Letters, 1994, 30(8), 2093-2095.[3]N.S. Correal, R. M. Buehrer, B. D. Woerner, Inproved C DMA performance through bias reduction for parallel interference cancellation, The 8th IEEE International Symposium on Personal Indoor and Mobile Radio Communications, Helsinki, Finland: IEEE Press, 1991, 565-569.[4]D. Divsalar, M. K. Simon, D. Raphaeli, Improved parallel interference cancellation for CDMA,IEEE Trans. on Communications, 1998, 46(2), 258-268.[5]P.G. Renucci, B. D. Woerner, Optimisation of soft interference cancellation for DS-CDMA,Electronics Letters, 1998, 34(8), 731-733.[6]Li Yue-Heng, Chen Ming, Cheng Shi-Xing, Determination of cancellation factors for soft-decision partial PIC detector in DS/CDMA systems, Electronics Letters, 2000, 36(3), 239-241. -
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