Title :
A new method to design CDMA spreading sequences
Author :
Jianxin, Bi ; Yingmin, Wang ; Hongxin, Tian ; Kechu, Yi
Author_Institution :
Nat. Key Lab. on ISN, Xidian Univ., Xi´´an, China
Abstract :
It is well-known that multi-value 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 circulate correlation property, which is given by an explicit expression. Based on this analysis, a criterion of maximizing entropy is proposed to design such codes. A computer simulation result suggests that the resulting codes outperform the conventional binary balance Gold codes for an asynchronous CDMA system
Keywords :
channel bank filters; code division multiple access; codes; correlation methods; maximum entropy methods; CDMA spreading sequences design; asynchronous CDMA system; binary balance Gold codes; circulate correlation property; entropy maximization; mirror multi-rate filter banks; multi-value CDMA spreading codes; Computer simulation; Design methodology; Design optimization; Entropy; Filter bank; Filtering theory; Frequency domain analysis; Gold; Mirrors; Multiaccess communication;
Conference_Titel :
Communication Technology Proceedings, 2000. WCC - ICCT 2000. International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-6394-9
DOI :
10.1109/ICCT.2000.889259
