卫星多载波混合信号的时延估计算法

Time-Delay Estimation Algorithm for Mixed Multi-carrier Signal in Satellite Communication

针对卫星通信中时频重叠的多载波信号,提出了一种基于循环自相关函数的时延估计算法。该算法分别分析了信道衰减、滤波器等信号参数已知和未知两种情况对应的算法理论和实现步骤,并分别阐述了载噪比大小、符号长度、频率精度、幅度精度以及频率间隔等参数对该算法的影响,同时给出了多载波混合信号时延估计的理论界。分析和仿真结果表明,该算法具有有效性。

For the time-frequency overlapping multi-carrier signal in satellite communication, a novel timedelay estimation algorithm based on cyclic autocorrelation function is proposed. The algorithm analyzes the corresponding theoretical foundation and implementation steps in the cases that the channel gains and parameters of filter are known or not. And this paper describes the influence of parameters such as carrier-to-noise ratio, symbol length, frequency accuracy, amplitude accuracy and frequency interval on the algorithm, and gives the theoretical bound of multi-carrier mixed-signal delay estimation. Analysis and simulation results indicate that this proposed algorithm is feasible and effective.