面向战场通信的抗噪声定时同步算法设计与FPGA实现OA

This paper strives to break through the reliability bottleneck of timing synchronization in single-carrier frequency-domain equalization(SC-FDE)systems in harsh battlefield environments by proposing an anti-resistant timing synchronization algorithm and its FPGA implementation architecture.A neighborhood gradient decision method for coarse synchronization is used to dynamically analyze gradient variations in delayed autocorrelation results,so as to locate frame start points precisely and suppress noise-induced jitter and false alarms;a multi-phase periodic averaging technique for fine synchronization is used to perform coherent superposition of multi-phase cross-correlation results by the periodic repetition characteristics of timing sequences,so as to enhance signal-to-noise ratio(SNR),sharpen correlation peaks,and filter aperiodic interference.At the hardware level,a lightweight hardware design is achieved by means of FPGA parallel pipelined architecture:in the step of coarse synchronization,optimized storage and comparators are employed for gradient judgment;in the fine synchronization,shift register banks and parallel adder trees are utilized for rapid cross-correlation computation.Experiments demonstrate significantly reduced synchronization error probability compared to conventional approaches across additive white Gaussian noise(AWGN),suburban multipath channels,and strong urban interference channels at low SNRs,and the FPGA implementation maintains reasonable resource utilization,so the proposed algorithm can meet the low-power and high-reliability requirements of the tactical communication terminals,and can effectively enhance communication stability in complex battlefield conditions.