Abstract
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.
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Supported by the National Natural Science Foundation of China (No. 69872027)
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Bi, J., Wang, Y. & Yi, K. A new design method of CDMA spreading codes based on multi-rate unitary filter bank. J. of Electron.(China) 18, 204–211 (2001). https://doi.org/10.1007/s11767-001-0029-0
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DOI: https://doi.org/10.1007/s11767-001-0029-0