A new acquisition method for PN code acquisition with large frequency offset

The paper presents a new code acquisition method for usage in DSSS communication system with large frequency offset. A serial correlator combined with decimation filters, which outputs are then fed into FFT process. By using the FFT technique, the search over the frequency uncertainty can be omitted and the usage of decimation filter can improve frequency resolution significantly. The performance in terms of mean acquisition time and SNR is shown to be better over traditional serial acquisition techniques. The hardware complexity is also reduced greatly at the same time.