Acquisition of spread spectrum codes with consecutive correlator outputs in the presence of fractional Doppler frequency offset

Abstract

A novel code acquisition scheme is proposed for the acquisition in time of spread spectrum codes in the presence of fractional Doppler frequency offset (FDFO). In the proposed acquisition scheme, the decision variable for detection is formed by combining two consecutive correlator outputs so that the influence of the reduction in the correlation peak due to the FDFO can be alleviated. Numerical results show that the proposed acquisition scheme can offer better mean-time-to-synchronization performance than the conventional scheme based on the cell-by-cell detection.