VHF/UHF通信电台接收链路中的干扰抑制合并方法

Interference rejection combining method in receive chain of VHF/UHF communication radio

考虑一发两收甚高频/特高频(very high frequency/ultrahigh frequency, VHF/UHF)通信电台接收链路存在的同频强干扰,针对传统抗干扰方法需精确估计信道参数的难题,提出一种基于决策的干扰抑制合并(decision-based interference rejection combining, D-IRC)方法。通过解析式定量分析了D-IRC输出信干噪比(signal to interference plus noise ratio, SINR)与输入SINR的关系,定义了干扰抑制功率失效区,并给出了D-IRC最优输出的选择策略。仿真结果表明,在信道参数未知场景下,D-IRC方法的决策输出性能优于传统干扰抑制合并(interference rejection combining, IRC)和最大比合并(maximal ratio combining, MRC)方法,同时失效区测度关系与理论分析一致。研究结果可为对抗环境下VHF/UHF电台抗干扰提供理论参考。

Considering the strong co-frequency interference in the receiving link of very high frequency/ultra high frequency(VHF/UHF) communication station with one transmitter and two receivers, aiming at the problem that the traditional anti-interference methods need to accurately estimate the channel parameters, a decision-based interference rejection combining(D-IRC) method is proposed. The relationship between the output signal to interference plus noise ratio(SINR) of D-IRC and the input SINR is quantitatively analyzed by analytical formulae, the interference suppression power failure area is defined, and the selection strategy of the optimal output of D-IRC is given. The simulation results show that under the scenario of unknown channel parameters, the decision output performance of the D-IRC method is better than the traditional interference rejection combining(IRC) and maximal ratio combining(MRC) methods, and the measurement relationship of failure zone is consistent with the theoretical analysis. The research results can provide a theoretical reference for the anti-jamming of VHF/UHF radio in the counter environment.