FFH/BFSK系统的一种基于频率和PN序列双图案的早迟门同步捕获方法

Synchronization Acquisition Using Early-Late Gate Based on Frequency-PN Sequence Double Pattern for FFH/BFSK Spread-Spectrum systems

针对FFH/BFSK系统的同步难题,该文提出了一种基于频率和PN序列双图案的早迟门同步捕获方法,理论分析和仿真结果显示,该方法门限的选择更为简单、准确;克服了全跳解调时由于收发窗口未同步引起的解调不可靠性。这种捕获方法能进一步提高捕获性能,在信道误比特率为0.1时,同步捕获概率大于95%。分析和仿真结果经过了试验台验证。

FFH（Fast Frequency-Hopping） synchronization is the major challenge for FFH/BFSK system. In this paper, a novel synchronization acquisition approach using the early-late gate for FFH/BFSK system is proposed, and it is based on frequency-PN sequence double pattern. Analytical and numerical results show the following advantages： the decision of threshold is more simple and accurate, and it overcomes the unreliableness of one-hop data demodulation, the unreliableness is caused by the not-alignment hop window of transmitter and receiver. The acquisition scheme can significantly improve the acquisition performance. When PB = 0.1, PA 〉 95%, where PB is the bit error rate and PA is the probability of synchronization acquisition. The analytical and numerical results are verified by a FFH testbed.