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Influence of Comb Filter on Demodulation Performance

Dang Li-hua

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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.

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What this paper is about

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.

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Available 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.

Key concepts: Comb filter, Computer science, Demodulation, Filter (signal processing), Bandwidth (computing), Filter design, All-pass filter, Electronic engineering

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