AN IMPROVED DOA ESTIMATION ALGORITHM FOR ASYNCHRONOUS MULTIPATH CDMA SYSTEM  

作　　者：Yang Wei Chen Junshi Tan Zhenhui Takis Mathiopoulos 

机构地区：[1]School of Electronics and Info. Eng., Beijing Jiaotong University, Beijing 100044, China [2]Dept of Electrical and Computer Eng., Univ. of British Columb（a, Vancouver, BC, V6T 1Z4, Canada

出　　处：《Journal of Electronics(China)》2006年第1期7-13,共7页电子科学学刊（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No. 60372014)

摘　　要：This paper proposes an improved Direction Of Arrival（DOA） estimation algorithm for asynchronous multipath Code Division Multiple Access（CDMA） system. The algorithm is based on the correlation matrices of outputs of decorrelator, which is a Multi-User Detection（MUD） approach, one of the key techniques for CDMA system. Through decorrelating processing, the desired user＇s mulipath signals can be resolved and all the other resolved multipath signal interference is eliminated. So the proposed algorithm is expected to perforln much better than algorithm such as that based directly on the Matched Filter（MF） bank outputs. Simulation results confirm this. While the improved algorithm performs better and better as Signal-to-Noise Ratio（SNR） increases, the performance of algorithm based directly on the MF bank outputs can not be improved.This paper proposes an improved Direction Of Arrival(DOA) estimation algorithm for asynchronous multipath Code Division Multiple Access(CDMA) system. The algorithm is based on the correlation matrices of outputs of decorrelator, which is a Multi-User Detection(MUD) approach, one of the key techniques for CDMA system. Through decorrelating processing, the desired user's mulipath signals can be resolved and all the other resolved multipath signal interference is eliminated. So the proposed algorithm is expected to perform much better than algorithm such as that based directly on the Matched Filter(MF) bank outputs. Simulation results confirm this. While the improved algorithm performs better and better as Signal-to-Noise Ratio(SNR) increases, the performance of algorithm based directly on the MF bank outputs can not be improved.

关 键 词：Code Division Multiple Access（CDMA） Decorrelating Direction Of Arrival（DOA） estimation Asynchronous multipath channel 

分 类 号：TN914.53[电子电信—通信与信息系统]