关键词: PCM FM, 调频, 中频带宽, 非相干解调, 误码率

Abstract:

Noncoherent demodulation is often adopted in Telemetry station equipment, which requires the receiver to set the intermediate frequency (IF) bandwidth based on the code rate. Unreasonable IF bandwidth will lead to increased telemetry demodulation error rate. The military standard defines the choice of different number of stalls IF bandwidth. The influence of intermediate frequency bandwidth of BER performance is simulated and analyzed in order to select the appropriate optimal intermediate frequency bandwidth for different code rates according to the principle of FM signal demodulation for non coherent frequency discrimination demodulation method. The simulation results show that the optimal bit error rate (BER) performance is obtained with a recommended value of 1.7 times the code rate for the intermediate frequency bandwidth parameters. The simulation analysis results are verified by hardware experiments.

Key words: PCM FM, frequency modulation, intermediate frequency bandwidth, noncoherent demodulation, bit error rate