关键词: 混沌序列, 直序码分多址, 抗干扰, 优选算法, 误码率

Abstract: In order to improve the anti-jamming performance of Direct Sequence/Code Division Multiple Access (DS/CDMA) system based on chaotic sequences, an optimization algorithm for choosing chaotic sequences was proposed. The optimal improved Logistic-map chaotic sequences were applied to DS/CDMA system, and the anti-jamming performances were studied under different kinds of jamming such as single-frequency interference, partial-band interference, and impulsive interference. The results show that the optimal improved Logistic-map chaotic sequences have larger capacity, excellent anti-jamming ability, and lower Bit Error Rate (BER). Compared with the Gold sequence, with the same BER, SNR can be improved at least 2dB, so they are more suitable for DS/CDMA system and anti-jamming technology.

Key words: chaotic sequence, Direct Sequence/Code Division Multiple Access (DS/CDMA), anti-jamming, optimization algorithm, Bit Error Rate (BER)