基于快速解擴(kuò)濾波器優(yōu)化的DS-CDMA多用戶干擾抑制
Interference rejection in DS-CDMA multiuser systems based on fash optimization of the despreading filter
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摘要: 該文提出了一種新的DS-CDMA信號(hào)檢測(cè)方法,采用正交錨定的旁瓣抵消器結(jié)構(gòu)和訓(xùn)練序列,基于最小濾波器輸出能量準(zhǔn)則,實(shí)現(xiàn)了解擴(kuò)濾波器快速非自適應(yīng)優(yōu)化,并通過測(cè)定碼匹配濾波器輸出的信號(hào)干擾噪聲比,有效控制了碼匹配濾波器失配對(duì)濾波器優(yōu)化的影響,從而實(shí)現(xiàn)了穩(wěn)健的多用戶聯(lián)合信道干擾抑制。進(jìn)一步采用RAKE技術(shù),提高了Rayleigh衰落信道中接收機(jī)的性能。
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關(guān)鍵詞:
- DS/CDMA; 干擾抑制; 快速濾波器優(yōu)化; 失配; RAKE
Abstract: In this paper, a new technique for DS-CDMA signal detection is proposed. By using the orthogonally-anchored generalized sidelobe canceller structure and training sequence, fast/nonadaptive optimization is achieved based on the minimum-output-energy criterion. The output signal to interference plus noise ratio of the code matched filter is effectively applied to suppress the effect of mismatch on optimization of the despreading filter, which results in robust multi-user access interference cancellation. Furthermore, the RAKE combining technique is used to improve the performance of the receiver in Rayleigh fading channels. -
Pingan Li.[J].J. A. Nossek, Projection based space-time rate processing for DS/CDMA systems,Proc. EPMCC99, Paris, March 9-1.1999,:-[2]M.L. Honig, U. Madhow, S. Verdu, Blind adaptive multiuser detection, IEEE Trans. on IT,1995, IT-41(4), 944-960.[3]S. Haykin, Adaptive Filter Theory, Third Edition, Prentice Hall USR, NJ, 1996, Chap. 5.9. ［4］.J. S. Goldstein, I. S. Reed, L. L. Scharf, A multistage representation of the wiener filter based on orthogonal projections, IEEE Trans on IT, 1998, IT-44(7), 2943-2959.[4]F. Adachi, M. Sawahashi, H. Suda, Wideband DS-CDMA for next-generation mobile communications systems, IEEE Commun. Mag., 1998, 36(9), 56-69. -
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