【摘要】 梳齿滤波器是失真自适应相干检测载波恢复中的重要一环,文中简要介绍了梳齿滤波器的原理、冲击响应特性以及实现方法,分析了梳齿滤波器在散射通信系统中的应用价值以及梳齿滤波器对解调性能的影响,最后对梳齿滤波器可能造成的性能损失进行了软件仿真,并给出仿真结果。仿真结果表明:梳状滤波器的带宽越大,其附加相移也较小,由此引起的信噪比损失也较小,相应的解调器的误码性能也较好。更多还原

【Abstract】 Comb filter is one of the important units in DAR.The paper briefly introduces the theory,impulsion response and implementation method of comb filter,then analyzes the application merits of comb filter in troposcatter communications and the influence of comb filter on demodulation performance.Finally,the performance loss that comb filter possibly brings is simulated with software and the simulation results are given.Simulation results show that the wider the bandwidth of comb filter is,the less the additional phase-shift of the comb filter is,so the less the loss of SNR is,and the better the performance of demodulation is.更多还原