Abstract:

A maximum likelihood (ML) based algorithm for joint timing estimation of both useful signal and co-channel interference is proposed. The likelihood function is first derived, and then the timings of two signals are identified in the two dimensional timing space by using a scale searching method. Compared with the traditional algorithm for single signal timing estimation, the proposed algorithm requires more observation data. The algorithm is little sensitive to frequency offsets and shows small performance attenuations for a frequency shift of 2% of the symbol rate. The simulation results verify the effectiveness of the proposed algorithm.