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標題: 多速率多載波分碼多工並列干擾消除接收機
A PIC Receiver for Multi-rate MC-CDMA System
作者: 陳漢強
Chen, Han-Chang
關鍵字: multirate;多速率;multicarrier;PIC;多載波;並列干擾消除器
出版社: 電機工程學系所
引用: [1] M.Majmunder, N.Sandhu, and J.H. Reed, “Adaptive single-user receiver for direct-sequence spread-spectrum CDMA systems,” IEEE Trans. Veh. Tech-nol., vol 49, no. 2,pp. 379-389,March 2000. [2] S.Roy and H.Yan, “Blind channel estimation in multi-rate CDMA sys-tems,”IEEE Trans. Commun., vol. 50, no. 2, pp. 995-1004, June 2002. [3] N. Yee, J. P. M. G. Linnartz, and G. Fettweis, “Multi-carrier CDMA in indoor wireless networks,” in Proc. PIMRC, Sept. 1993, pp. 109—113. [4]L. Hanzo,M. Munster, B. J. Choi,and T. Keller,OFDM and MC-CDMA for Broadband Multi-user Communications, WLANs and Broadcasting. Wiley-IEEE Press, Sep. 2003. [5] S. Hara and R. Prasad, Multicarrier Techniques for 4G Mobile Communications. Artech House, 2003. [6] A. Tarighat and A. H. Sayed, “An Optimum OFDM Receiver Exploiting Cyclic Prefix for Improved Data Estimation,” IEEE International Conference Acous-tics, Speech, and Signal Processing vol. 4, pp. IV-217-20, April. 2003. [7] C. Li and S. Roy, “Subspaced-Based Blind Channel Estimation for OFDM by Exploiting Virtual Carriers,” IEEE Trans. Commun., vol. 2, no.1, pp. 141-144, Jan. 2003. [8] J. Chen, J. Wang, and M. Sawahasi, “MCI cancellation for multicode wideband CDMA systems,” IEEE J. Sel. Areas Commun., vol. 20, no. 2,pp. 450—462, Feb. 2002. [9] K. S. Li, Q. Z. Ding, X. Yang, and L. S. He, “Performance of active code detection algorithms for the downlink of TD-SCDMA System,” in Proc. IEEE ISCAS, 2002, vol. 1, pp. I-613—I-616. [10] S. I. Kim and H. S. Lee, “Performance improvement of RAKE receiver for a multicode DS-CDMA system with multistage interference cancellation detec- tors,” in Proc. IEEE TENCON, Sep. 1999, vol. 1, pp. 573—576. [11] A. Klein, G. K. Kaleh, and P. W. Baier, “Zero forcing and minimum mean- squared-error equalization for multiuser detection in code-division multiple- access channels,” IEEE Trans. Veh. Technol., vol. 45, no. 2, pp. 276—287, May 1996. [12] D. Divsalar, M. K. Simon, and D. Raphaeli, “Improved parallel interference cancellation for CDMA,” IEEE Trans. Commun., vol. 46, no. 2, pp. 258—268, Feb. 1998. [13] M. Ghotbi and M. R. Soleymani, “Multiuser detection of DS-CDMA signals using partial parallel interference cancellation in satellite com-munications,” IEEE J. Sel. Areas Commun., vol. 22, no. 3, pp. 584—593, Apr. 2004. [14] Y.-T. Hsieh and W.-R. Wu, “Optimal two-stage decoupled partial PIC re- ceivers for multiuser detection,” IEEE Trans. Wireless Commun.,vol.4, no. 1, pp. 112—127, Jan. 2005. [15] C.-C. Hsu and Y. Lee, “Multistage weighted interference cancellation with receiver diversity for DS-CDMA,” IEEE Trans. Signal Process., vol. 52, no. 2, pp. 558—565, Feb. 2004. [16] S. Hara, “Overview of Multicarrier CDMA,” IEEE Commun. Mag., pp. 126- 133, Dec. 1997. [17] R. Negi and J. M. Cioffi, “Blind OFDM Symbol Sychronization in ISI Channel,” IEEE Trans. Commun., vol. 50, pp. 1525-1534, Sep. 2002. [18] A. D. Whalen, Detection of signals in noise. New York Academic,1971. [19] S. W. Marple, Digital spectral analysis with applications. Englewood Cliffs, NJ: Prentice-Hall, 1987. [20] G. Kawas Kaleh, “Channel equalization for block transmission systems,” IEEE J. Select. Areas Commun., Jan. 1995. [21] COST 207: Digital land mobile radio communications, final report, Office for Official Publications of the European Communities, Luxembourg,1989. [22] J. G. Proakis, Digital Communications. New York McGraw-Hill, 1983.
我們提出了多載波多用戶多重接取 (MC-CDMA)系統的一個系統模型和 提出了MMSE-BDFE 它的接收器加入多階層平行的干擾消除器。 我們的接收器包括 一個等化器作為初始資料偵測,後面接著多階段干擾消除器去完成更 精準的資料偵測. 傳統的CDMA 系統利用了干擾消除器,與RAKE 接收器作為初始資料偵測.RAKE接收器有很多不正確的初始資料到他的後來的階層, 因為它的輸出包含了許多的干擾。這將使的錯誤累積的結果到下一階層這不精準的資料偵測導致這重大的錯誤累積 之後的階層降低了誤碼率的表現。我們提出的計劃解決了這問題。 我們使用最小均方誤差判定反饋(MMSE-BDFE)等化器, 因為它比衰減補償判定反饋(Zero-Foring)好。 我們的接收器包括多級平行干擾消除。模擬結果顯示我們提出的計畫加入多階層平行的干擾消除器的結果比傳統的最小均方誤差判定反饋(MMSE-BDFE)等化器明顯的好。在上行BU 通道,有加入多階層平行的干擾消除器改善錯誤率至少2dB.

We have presented a system model for multiuser multicode MC-CDMA system and proposed a PIC of MMSE-BDFE receiver scheme for it. Our receiver consists of an equalizer as an initial data estimator, followed by an IC section for improving the accuracy of data estimates. Conventional receivers for CDMA systems utilized interference cancellation (IC) schemes, with the RAKE receiver as an initial data estimator. RAKE receiver that have inaccurate information on the initial detection,because the output contains the interference in decision. This will produce the results of error propagation to the next stage. This inaccurate data estimate leads to significant error propagation to the subsequent stages and thus degrades the bit error rate (BER)performance. Our proposed scheme solution the problem. We use the Minimum Mean-Square-Error Block Decision Feedback (MMSE-BDFE) Equalizer because it perform better than Zero-Foring Block Decision Feedback . And then our receiver consists of multistage PIC. Simulation results show that the BER performance of our proposed scheme significantly outperforms conventional MMSE-BDFE receiver without PIC in many channel realizations. In uplink BU channel and at BER = 10^2, one-stage PIC improves the BER at least 2 dB over the
其他識別: U0005-1508200920420200
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