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多径干扰(Multiple Path Interference,MPI)与多址干扰(Multiple Access Interference,MAI)是影响CAPS(Chinese Area Positioning System)卫星扩频通信系统性能的重要因素,选择相关特性优良的扩频码以及在接收端采用多用户检测算法是克服上述问题的有效途径.针对传统线性扩频码数目有限、复杂度低等缺点,对基于Chebyshev映射的混沌序列性能进行了仿真分析,并建立CAPS卫星扩频通信盲多用户检测系统模型,对混沌序列在卫星扩频通信系统中的应用进行研究.仿真实验表明,混沌序列生成简单,具有相关性能良好、可用码组数目众多、保密性好等优点.将混沌序列与多用户检测算法结合应用在CAPS系统中,有可能改善系统性能,提高系统容量,具有很大的实用价值.
Multiple Path Interference (MPI) and Multiple Access Interference (MAI) are important factors that affect the performance of the CAPS (China Area Positioning System) satellite spread spectrum communication system. Selecting the spreading codes with good correlation characteristics, The multiuser detection algorithm at the receiving end is an effective way to overcome the above problems.Aiming at the limitations of the traditional linear spread spectrum codes, such as limited number and low complexity, the chaotic sequence performance based on Chebyshev mapping is simulated and the CAPS satellite spread spectrum communication Blind multi-user detection system model, and studies the application of chaotic sequences in satellite spread spectrum communication system.The simulation results show that the generation of chaotic sequences is simple, the correlation performance is good, the number of available code blocks is large, the confidentiality is good, Sequence combined with multi-user detection algorithm used in the CAPS system, it is possible to improve system performance, increase system capacity, with great practical value.