A NEW DESIGN METHOD OF CDMA SPREADING CODES BASED ON MULTI-RATE UNITARY FILTER BANK  

作　　者：Bi Jianxin Wang Yingmin Yi Kechu(National Key Lab. on ISN, Xidian University, Xi’an 710071) 

出　　处：《Journal of Electronics(China)》2001年第3期204-211,共8页电子科学学刊（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.69872027)

摘　　要：It is well-known that the multi-valued CDMA spreading codes can be designed by means of a pair of mirror multi-rate filter banks based on some optimizing criterion. This paper indicates that there exists a theoretical bound in the performance of its circulating correlation property, which is given by an explicit expression. Based on this analysis, a criterion of maximizing entropy is proposed to design such codes. Computer simulation result suggests that the resulted codes outperform the conventional binary balanced Gold codes for an asynchronous CDMA system.It is well-known that the multi-valued CDMA spreading codes can be designed by means of a pair of mirror multi-rate filter banks based on some optimizing criterion. This paper indicates that there exists a theoretical bound in the performance of its circulating correlation property, which is given by an explicit expression. Based on this analysis, a criterion of maximizing entropy is proposed to design such codes. Computer simulation result suggests that the resulted codes outperform the conventional binary balanced Gold codes for an asynchronous CDMA system.

关 键 词：MULTI-RATE UNITARY filter BANK CDMA SPREADING code Maximum ENTROPY criteria 

分 类 号：TN[电子电信]