CDMA信号码片内多径时延估计算法
Time Delay Estimation of Multipath in CDMA Chip
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摘要: 针对CDMA信号的特点，提出了低信噪比条件下估计延迟差小于一个码片周期的多径信号时延的有效算法，该文首先建立了一个能够有效抑制噪声影响的多径功率延迟函数，然后推导了建立在此函数基础上的高分辨率时延估计算法，给出了算法的具体步骤，分析了算法的性能，最后通过对比仿真和性能仿真证明了该方法具有低信噪比条件下高频谱分辨率的特点。Abstract: An effective algorithm is proposed to estimate multipath time delays in a CDMA chip under low SNR environment. Firstly, a power delay profile of multipath is constructed which can restrain effect of noise. Then the estimation algorithm that has super resolution is deduced based on the function. A detailed estimation process and analysis of the performance of this approach are given. Finally, comparsion and performance simulation demonstrate that the method can effectively estimate the delay of multipath in a CDMA chip under low SNR environment.
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