扩频通信系统跟踪解扩的优化设计OA

To address the problem that the demodulation performance of a spread spectrum communication system was constrained by the despreading and tracking of spread spectrum codes,a spread spectrum code tracking error suppression scheme based on the co-optimization of single/multi-sample despreading strategies and the roll-off factor was designed.By constructing a spread spectrum code tracking error model and combining with the single/multi-sample despreading strategy and roll-off factor co-optimization method,specific approaches for the optimized design of the spread spectrum system were proposed.A simulation platform was built to verify the effectiveness of the scheme.The results show that spread spectrum code tracking error is positively correlated with despreading SNR loss,the larger the roll-off factor and the error,the more significant the loss;Under scenarios with small spread spectrun tracking errors,single-sample despreading outperforms multi-sample despreading in terms of pure performance,anti-wideband/narrowband interference capability,and error adaptability.Single-sample despreading combined with reasonable tracking parameter design(such as 8-times code rate sampling or resampling)effectively improves the direct sequence spread spectrum(DSSS)demodulation performance,can provide theoretical support and new ideas for the engineering implementation of optimized design in spread spectrum communication systems.