使用決策視窗法應用於多輸入多輸出展頻通訊系統的EM向量通道估測法與資料偵測

EM-Based Vector Channel Estimation and Symbol Detection by Using Decision Window in MIMO-CDMA Systems

曾元慶(Yuan-Ching Tseng)

指導教授 ： 曾恕銘

國立臺北科技大學/機電學院/電腦與通訊研究所/碩士(2005年)

摘要

我們考慮在多輸入多輸出的直接序列展頻通訊系統中，每一個使用者具有多根天線且其每根天線皆使用相同的展頻碼。我們提出一種新的適應性通道估計與決策視窗資料偵測的方法。此種適應性的方法較之前所提出之方法更能夠被應用於時變或非時變的通道特性上且減少訓練序列的長度。藉著加入一決策視窗法來減少偵測一個欲知使用者的不同天線所傳送訊號的混淆。由電腦的模擬結果可看出我們所提出方法的改進。

關鍵字

分碼多工存取(CDMA) ； 多輸入多輸出(MIMO) ； 向量通道估測(Vector Channel Estimation) ； 多重存取干擾(Multiple Access Interference) ； 決策混淆(Decision Ambiguity)

並列摘要

We consider multiuser MIMO DS-CDMA systems where each user has multiple transmitter antennas and different antennas of the same user use the same spreading code. We propose a novel adaptive vector channel estimation and decision-window-based symbol detection method. Compared to the previous scheme, the proposed adaptive method can be applied to the channel with time varying or non-time varying Doppler shift and reduces the length of training sequence. The proposed decision-window-based symbol detection method reduces decision ambiguity among transmitted symbols from different antennas of the desired user. Computer simulations show the improvement of our proposed method.

並列關鍵字

CDMA ； MIMO ； Vector Channel Estimator ； MAI ； Decision Ambiguity

參考文獻

[1] G. J. Foschini and M. J. Gans., “ On the Limits of Wireless Communication in a Fading Environment When Using Multiple Antennas,” Wireless Personal Communications, 6(3), pp. 311–335, 1998.

[2] P. W. Wolniansky, G. J. Foschini, G. D. Golden, and R. A. Valenzuela., “V-blast: An architecture for realizing very high data-rates over the rich-scattering wireless channel,” Proc. IEEE ISSSE-98, pp. 295-300, Sept. 1998.

[3] S. Verd’u, Multiuser Detection. New York: Cambridge Univ. Press, 1998.

[4] Ke Deng, Qinye Yin, Le Ding, and Zheng Zhao, “Blind channel estimator for V-BLAST coded DS-CDMA system in frequency-selective fading environment,” Proc. VTC 2003-Fall, Vol. 1, pp. 458-462, Oct. 2003.

[5] D. Reynolds, X. Wang, and H. V. Poor, “Blind adaptive space-time multiuser detection with multiple transmitter and receiver antennas,” IEEE Trans. Signal Processing, Vol. 50, pp. 1261-1276, June 2002.