Abstract To solve the problem of incorrect quotation of Bit Error Rate(BER) in theory and misuse the length of testing codes within guaranteed confidence level in demodulation loss tests, the theory BER of some kinds of modulation are analyzed and listed, and the relationship of testing length of codes and the confidence level in BER tests are derived (within 0.99 confidence level,136/Pe codes must be tested, Pe is the maxim BER the system can tolerate). Experiments are performed, results show that incorrect quotation of BER in theory of BPSK and CPFSK may cause errors of 0.7dB and 1.0dB separately which is comparable with demodulation loss itself; and under the same modulation and the same EbN0 input, the repeatability of demodulation loss using 136/Pe is 0.08dB, which is 4 times better than using 10/Pe.
YU Qing-hua,CONG Bo,QIU Bin, et al. Research on Measurement of Demodulation Loss in Communication System[J]. Acta Metrologica Sinica, 2021, 42(9): 1220-1224.
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2021, Vol. 42 
