Abstract:

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.