Large frequency offset carrier synchronization in segmented matched filter DS/BPSK receiver

This paper investigates the effects of significant frequency offset on the performance of a digital segmented matched filter (SMF) DS/BPSK receiver. A new carrier frequency discriminator for carrier acquisition in this structure of high dynamic DS/BPSK receiver is presented. The proposed algorithms employs segmented correlator and whole length correlator outputs to form a frequency discriminator (CFD) which has a tracking range of the symbol rate, and the tracking range is independent of the spreading code length. A frequency synchronization scheme is also explored, which extending the range of frequency acquisition and shorting the time of acquisition. At mean time the paper presents the best discriminator selection between CFD and four-quadrant frequency discriminator(FQFD) during the process of acquisition.