Abstract: The decomposition of the received signal realized by discrete wavelet packet transformation in DSSS systems is studied. The performance evaluation of the excision techniques via DWT is presented. The optimal adaptive NBI rejection arithmetic is also proposed. Using the adaptive filter instead of sub-band excision, which suppresses NBI efficiently and impoves loss of the avail signal. Analyzed and simulated results show that the interference suppression method of adaptive wavelet packet decomposition based on the TSA algorithm will obtain better performance than that of conventional sub-band elimination. Additionally, the orientation speed of the adaptive algorithm can be increased.

Key words: discrete wavelet packet transformation, DSSS, adaptive filter, sub-band excision