High accuracy data-aided frequency offset tracking for burst mode mobile radio

Carrier synchronization and tracking are crucial for satisfactory functioning of burst mode mobile communication, and implementation of the corresponding algorithms becomes challenging in the mobile receiver. The problem can be addressed in two ways: (i) estimate the frequency offset and correct the local oscillator frequency at the receiver using phase locked loop; (ii) estimate the frequency offset and incorporate the correction in software. Our technique belongs to the second category. The estimation and tracking can be performed at IF or at the baseband. We propose a technique in the baseband. We use an IIR adaptive line enhancer for initial acquisition of the frequency offset and a data-aided correlation based method for tracking the offset. We provide some simulation results to illustrate the effectiveness of the proposed method.