Implement of IF Digital Direct Sequence Spread Spectrum Receiver
Zhao Lin-jun · Modern Electronics Technique · 2008
A realization scheme on IF digital receiver of unified channel spread spectrum communication system is introduced.The FFT estimation algorithm is used for carrier and pseudo-random code captures,the CPAFC loop and the COSTAS loop are used for its tracking,GOLD code tracking uses digital DLL loop.These technologies can effectively be used to reduce the Doppler shift to impact on this system performance.When GOLD code synchronization,the same rate and cycle times of GOLD code and truncated m sequence are used for guiding truncated m sequence synchronization rapidly.Finally,a constant resolution and data link method of Median Values is discussed.