多徑衰落信道下多載波CDMA信號的頻率分集接收
FREQUENCY DIVERSITY RECEPTION OF MULTI-CARRIER CDMA SIGNALS OVER MULTIPATH FADING CHANNEL
-
摘要: 本文研究了多載波碼分多址(Multi-Carrier CDMA)擴展頻譜系統(tǒng)在多徑衰落信道下的頻率分集接收技術。文中首先研究了理想載波恢復、頻率選擇性瑞利衰落信道條件下多載波碼分多址系統(tǒng)的性能,然后提出了用時間頻率窗平滑來改善載波相位估計的算法,并對該算法在衰落信道下的性能進行了仿真。理論推導和計算機仿真結果說明,多載波碼分多址系統(tǒng)的頻率分集接收方案與理論上最佳的RAKE分集接收相比,性能略有下降,但接收機結構得到了簡化。Abstract: In this paper, the frequency diversity reception of multi-carrier CDMA signal is studied. The performance of multi-carrier CDMA system under perfect carrier recovery and frequency selective Rayleigh fading channel condition is analyzed. A smoothing algorithm utilizing time-frequency window for improving carrier phase estimation of multi-carrier CDMA signal is suggested. Simulation results for this algorithm are obtained under fading channel condition. It is shown that the frequency domain diversity reception scheme suggested in this paper suffers an in- significant degradation of performance comparing with theoretically optimal RAKE receiver, while considerably simplifying the receiver architecture.
-
曹葉文.多載波頻率分集擴展頻譜碼分多址通信原理的研究:[博士生論文],北京:北京大學,1995年6月.[2][美] 約翰 G 普羅基斯著,齊懷亮,等譯.數(shù)字通信.北京:電子工業(yè)出版社,1988年,第七章.[3]Cao Yewen, Xiang Haige. A frequency-diversity spread-spectrum multiple access system with random signature sequences. Journal of China Institute of Communications, 1995, 16(4): 56-62.[4]Crespo P M, et al. Spread-time code-division multiple access. IEEE Trans. on Comm., 1995, COM-43(6): 2139-2148.[5][5][6]Yee N.[J].Linnartz J P. Controlled equalization of multi-carrier CDMA in an indoor rician fading channel. IEEE VTC94 Conf. Rec., Stockholm: June.1665,1994:- -
計量
- 文章訪問數(shù): 2157
- HTML全文瀏覽量: 130
- PDF下載量: 419
- 被引次數(shù): 0
下載:
