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为了获取适用于准同步码分多址系统的混沌序列 ,提出一种用于准正交序列性能分析的优选准则 ,并通过系统仿真对优选混沌序列进行了验证。在准同步码分多址系统中 ,影响系统性能的是零时延附近的部分扩频序列相关函数 ,而且奇相关函数和偶相关函数发挥同等重要的作用。据此对初值不同的 L ogistic映射序列进行筛选 ,得到了混沌准正交序列组。采用 Monte Carlo的方法 ,在 AWGN信道下对采用混沌优选序列的准同步码分多址系统进行了仿真。结果表明 :优选的混沌序列具有优秀的准正交性 ,适用于准同步码分多址系统
In order to obtain the chaotic sequence suitable for quasi-synchronous code division multiple access system, a preferred criterion for the performance analysis of quasi-orthogonal sequence is proposed. The chaotic sequences are verified by system simulation. In quasi-synchronous CDMA systems, part of the spreading sequence correlation functions that affect the system performance are near the zero delay, and the odd and even correlation functions play an equally important role. Based on this, the L ogistic mapping sequences with different initial values are screened, and the chaotic quasi-orthogonal sequence group is obtained. Monte Carlo method is used to simulate the quasi-synchronous code division multiple access system using chaos sequence based on AWGN channel. The results show that the optimal chaotic sequence has excellent quasi-orthogonality and is suitable for quasi-synchronous code division multiple access system