異步DS-CDMA系統(tǒng)中的最優(yōu)時(shí)空線性多用戶檢測(cè)器
Optimal linear space-time multiuser detector for analychonous DS-CDMA systems
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摘要: 該文給出了一種適用于異步DS-CDMA系統(tǒng)的通用線性時(shí)空二維多用戶檢測(cè)方法,它將所有線性多用戶檢測(cè)器歸結(jié)到一個(gè)統(tǒng)一的數(shù)學(xué)模型之下?；诖四Ｐ?該文將時(shí)空線性多用戶檢測(cè)問(wèn)題轉(zhuǎn)化為一個(gè)權(quán)矢量的優(yōu)化問(wèn)題,并在線性約束最小方差(LCMV)準(zhǔn)則下給出了權(quán)矢量的優(yōu)化解。對(duì)現(xiàn)有的幾種典型線性多用戶檢測(cè)器的分析表明,這些方法都可以看作是該文提出的通用時(shí)空線性多用戶檢測(cè)方法的特例,且只能在某種限定條件下得到局部最優(yōu)解,因此其抑制多址干擾和噪聲的能力都低于文中的最優(yōu)時(shí)空線性多用戶檢測(cè)器。最后,給出了數(shù)值仿真結(jié)果。
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關(guān)鍵詞:
- 時(shí)空二維處理; 線性多用戶檢測(cè)器; 碼分多址
Abstract: A versatile signal model suitable for linear space-time multiuser detectors in asynchronous DS-CDMA systems is proposed. Based on the model, a versatile linear space-tine multiuser detector is presented and its optimal solution according to the Liner Constrained Minimum Variance (LCMV) criterion is deduced. The analyses of the existent linear multiuser detectors demonstrate that these methods are just the special cases of the versatile detector in this paper and can only achieve the suboptimal solution. Hence their interference canceling performance is inferior to the optimal detector in this paper. Finally, numerical simulations are presented. -
S. Verdu, Minimum probability of error for asynchronous Gaussian multiple-access channel, IEEE Trans. on Info. Theory, 1986, IT-32(1), 85-96.[2]R. Lupas, S. Verdu, Linear multiuser detectors for synchronous code-division multiple-access channels, IEEE Trans. on Info. Theory, 1989, (1), 123-136.[3]M. Honig, U. Madhow, S. Verdu, Blind adaptive multiuser detection, IEEE Trans. on Info.Theory, 1995, 41(7), 944-960.[4]S.Y. Miller, S. C. Schwartz, Integrated spatial-temporal detectors for asynchronous Gaussian multiple-access channels, IEEE Trans. on Comm. 1995, 43(2), 396-411.[5]J. Choi, Beamforming for the multiuser detection with decorrelator in synchronous CDMA systems: Approaches and performance analysis, Signal Processing, 1997, 60(7), 195-211.[6]X.D. Wang, H. V. Poor, Space-time multiuser detection in multipath CDMA channels, IEEE Trans. on Signal Processing, 1999, 47(9), 2356-2374. -
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