A Twi-Serial-Parallel Correlator with FFT Approach for Long Code Acquisition in Spread Spectrum Communication System

In this paper, the representation of Doppler effect on code acquisition performance is analyzed and the principle of combining serial-parallel correlator with FFT is given based on the discrete-time signal processing. The improved code acquisition architecture by combining twi-serial-parallel correlator with FFT for the long PN code spread spectrum communication system is designed and realized in FPGA and DSP. This architecture provides a very good trade-off between acquisition performance and complexity. Application results show this architecture is very attractive for the long PN code spread spectrum communication system.