Equivalent Time-Domain Representation and Uplink Channel Estimator for Multicarrier CDMA Systems  

作　　者：吴晓军 殷勤业 曾明 

机构地区：[1]School of Electronics and Information Engineering, Xi' an Jiaotong University, Xi' an 710049, P. R. China

出　　处：《Journal of Systems Engineering and Electronics》2003年第3期1-7,共7页系统工程与电子技术（英文版）

基　　金：This project was supported by the National Natural Science Foundation of China (No. 69872029) ; the Research Fund for Doctoral Program of Higher Education of China (No. 1999069808).

摘　　要：Many blind channel estimation methods have been proposed for direct sequence (DS) code-division multiple access (CDMA) systems, so we can certainly use them to estimate the finite impulse response (FIR) channel for the multi-carrier (MC-) CDMA system. In this paper, the MC-CDMA system is interpreted as an equivalent time-domain DS-CD-MA system with specific spreading codes. Then, an equivalently time-domain blind channel estimator is derived for the uplink MC-CDMA, which is based on second-order statistics of the received data. By exploiting singular value decomposition (SVD) and the finite alphabet property of transmitted symbols, the time-domain channel impulse response (CIR) for the uplink MC-CDMA can be accurately identified. Computer simulations illustrate both the validity and the overall performance of the proposed estimator.Many blind channel estimation methods have been proposed for direct sequence (DS) code-division multiple access (CDMA) systems, so we can certainly use them to estimate the finite impulse response (FIR) channel for the multi-carrier (MC-) CDMA system. In this paper, the MC-CDMA system is interpreted as an equivalent time-domain DS-CD-MA system with specific spreading codes. Then, an equivalently time-domain blind channel estimator is derived for the uplink MC-CDMA, which is based on second-order statistics of the received data. By exploiting singular value decomposition (SVD) and the finite alphabet property of transmitted symbols, the time-domain channel impulse response (CIR) for the uplink MC-CDMA can be accurately identified. Computer simulations illustrate both the validity and the overall performance of the proposed estimator.

关 键 词：Multicarrier code-division multiple access Channel impulse response Multiple access interference Intersym-bol interference Cyclic prefix Blind channel estimation Multiuser detection. 

分 类 号：TN914.53[电子电信—通信与信息系统]