突发模式直扩接收机的设计与实现

摘要

突发直扩传输模式在军用无线多址接入系统中具有广阔的应用前景。其主要技术难点体现在接收机要在强噪声背景下对同步参数进行快速捕获。文章设计并实现了一种全数字TDMA—DS—DBPSK接收机，提出了一种自适应门限的后检测积分捕获方法，实现了大频偏、高动态短时信号的快速捕获。最后开发了基于FPGA的验证平台，验证了接收机的有效性。%Burst DS Transmission mode has wide application prospects in military wireless multiple access system. The key issue is fast acquisition of synchronization parameter in strong noise background. An all-digital TDMA-DS-DBPSK receiver scheme is proposed, which utilize an adaptive threshold PDI method to achieve fast acquisition in large frequency offset and high dynamic scene. Finally, a verification platform based on FPGA is developed for evaluating performance, and the effectiveness of the receiver is validated.