优化混沌扩频序列的抗干扰性能分析

为了提高基于混沌序列的直序码分多址系统(DS/CDMA)抗干扰性能，提出一种优化混沌序列性能的优选算法，将得到的优化序列应用于DS/CDMA系统中，研究分别在加入单频干扰、部分频段干扰、脉冲干扰情况下的抗干扰性能。结果表明优化后的改进型Logistic映射混沌序列可利用的码数目众多，抗干扰能力强，且系统误码率较低，与Gold序列相比，在相同误码率情况(10^(-1))下，信噪比至少可改善2dB,更适合用于DS/CDMA系统和通信抗干扰技术中。

Anti-jamming performance analysis ofoptimal chaotic spread spectrum sequences

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.