Abstract:

Since the synchronization algorithm based on the auto-correlation of pseudo-noise (PN) sequences for time-domain synchronization (TDS) orthogonal frequency division multiplexing (OFDM) systems is affected by the carrier frequency offset, a time metric function adopting the correlation of two sliding windows is proposed for signal synchronization. By using the function, well correlation peak values can be obtained and could not be affected by frequency offsets. Carrier frequency offsets are estimated by the peak values of main power paths in the multipath channel, the proposed algorithm can get comparatively accurate estimated values and wide estimated ranges. Simulation results in the typical city channel show that the proposed algorithm gets exact signal synchronization and comparatively accurate frequency estimated values while having quite big frequency offsets.