单通道同频混合信号时延高效估计方法

针对单通道同频数字混合信号时延估计问题，提出了一种数据辅助的方法，将整个估计流程分成了基于数据辅助的时延粗估计与基于最大似然的时延精估计两个过程。该方法克服了以往基于最大似然同频混合信号时延估计的很多弊端，改进了搜索方式并探讨了消除时延模糊的方法，提高了估计精度。最后又分析了性能界，为本文方法的性能分析提供了理论依据。该方法较依赖于两路时延差，对频偏误差不敏感，仿真实验验证了该方法的有效性与实用性。

Efficient time delay estimation algorithm for #br# single channel co frequency signals

Aimed at the time delay estimation of single channel co frequency signals, a data aided algorithm is proposed. The whole estimation process is divided into rough delay estimation based on data aided and accurate delay estimation based on maximum likelihood. This new algorithm overcomes the drawbacks in the traditional ones based on maximum likelihood for time delay estimation, improves searching methods with eliminating the delay blur, and raises the estimation accuracy. In the end, the performance bound is analyzed to provide the theoretical basis for capability. The algorithm is more dependent on the difference between delays, little sensitive to frequency offsets. And the simulation results verify the effectiveness and practicality of the proposed algorithm.