Study on Multipath Effect under the Environment of PCM/FM Telemetry Soft Demodulation

Gang Fu; Yan Jun Wu; Ren Long Li; Li Ping Wang

doi:10.4028/www.scientific.net/AMM.602-605.2298

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 602-605Study on Multipath Effect under the Environment of...

Study on Multipath Effect under the Environment of PCM/FM Telemetry Soft Demodulation

Abstract:

Because the reentry telemetry wireless channel multipath propagation effects and the effect, channel will introduce transmission time delay dispersion, caused between the PCM/FM telemetry signal crosstalk and signal to noise ratio is too low, significantly increase BER. While traditional demodulation method because the demodulator threshold higher no longer apply. Study the problem, a multiple Symbol Detection method based on sliding strategy (Multi - Symbol Detection, MSD), can effectively overcome the low SNR and inter symbol interference. The simulation and test results verify the effectiveness of the method.