Performance Analysis of a Transform Domain Receiver for DS-CDMA Systems  

作　　者：SHAO Shihai TANG Youxi PAN Wensheng LI Shaoqian 

机构地区：[1]National Key Laboratory of Communication, University of Electronic Science and Technology of China, Chengdu 610054, China

出　　处：《Chinese Journal of Electronics》2006年第4期707-712,共6页电子学报（英文版）

基　　金：This work is supported by the National Natural Science Foundation of China （No.60272009, No.60572090, No.60472045, No.60496313） and Doctor Foundation of Higher Education Institutions of China （No.20050614009）.

摘　　要：This paper describes a more generalized transform domain receiver for Direct sequence Code division multiple access （DS-CDMA） systems. The proposed receiver is motivated by the equivalence of the transmitted signal forms between the DS-CDMA transmitter and time-frequency two dimensional Spread spectrum （2D-SS） transmitter. Bit error rate （BER） performance with Maximum ratio combining （MRC） and the computational complexities of the system are obtained. To combat degrading effects of multl-path fading channels, we also propose a simple channel estimation method for the generalized transform domain receiver. Finally, compared with the conventional RAKE receiver, the BER performance in uplink channels with frequency-selective Rayleigh fading is shown by computer simulations and the BER from the analysis agrees well with the simulation results. For the receiver based on 2D-SS, the BER upper bound is a little worse than that of four-finger RAKE but better than that of one-, two-, and three-finger RAKE over 3GPP TS 25.104 Case 3 channel. And over ITU-R M.1225 indoor office channel A, we note that the BER performance of the receiver based on 2D-SS is better than that of the conventional RAKE receiver using imperfect channel estimation.

关 键 词：Direct sequence spread spectrum Code division multiple access Fast Fourier transform （FFT） Bit error rate. 

分 类 号：TN914.53[电子电信—通信与信息系统]