A synchronization acquisition algorithm based on the frequency hopping pulses combining

As modern electromagnetic environments are more and more complex, the anti-interference performance of the synchronization acquisition is becoming vital in wireless communications. With the rapid development of the digital signal processing technologies, some synchronization acquisition algorithms for hybrid direct-sequence (DS)/frequency hopping (FH) spread spectrum communications have been proposed. However, these algorithms do not focus on the analysis and the design of the synchronization acquisition under typical interferences. In this paper, a synchronization acquisition algorithm based on the frequency hopping pulses combining (FHPC) is proposed. Specifically, the proposed algorithm is composed of two modules: an adaptive interference suppression (IS) module and an adaptive combining decision module. The adaptive IS module mitigates the effect of the interfered samples in the time-domain or the frequency-domain, and the adaptive combining decision module can utilize each frequency hopping pulse to construct an anti-interference decision metric and generate an adaptive acquisition decision threshold to complete the acquisition. Theory and simulation demonstrate that the proposed algorithm significantly enhances the anti-interference and anti-noise performances of the synchronization acquisition for hybrid DS/FH communications.