针对通信系统解调损失测试过程中存在的引用理论误码率不准确以及保证置信度情况下的码元测试长度的标准不一问题,对部分常引用错误的调制体制的理论误码率进行了推导分析,对误码率测试长度与置信度之间的关系进行分析计算,得到在置信度0.99情况下码元测试长度应不小于136/Pe(Pe为系统的误码率上限)。开展了验证实验,实验数据表明,错误的引用BPSK以及CPFSK(非相干解调)的理论误码率将引起解调损失误差分别不小于0.7dB和1.0dB;相对于136/Pe的码元测试长度下的解调损失的重复性为0.08dB,10/Pe的码元测试长度下的解调损失的重复性增大了4倍。
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.
关键词
计量学 /
解调损失 /
理论误码率 /
误码率置信度 /
误码率测试长度
Key words
metrology /
demodulation loss /
BER in theory /
confidence level /
the length of testing codes
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
［1］刘嘉兴. 飞行器测控与信息传输技术［M］. 北京: 国防工业出版社, 2011: 178-179.
［2］吴伟仁, 节德刚, 丁兴文, 等. 深空测控通信中GMSK体制非相干解调算法研究［J］. 宇航学报, 2014, 35(12): 1437-1443.
Wu W R, Jie D G, Ding X W, et al. Research on GMSK nocoherent Demodulation Algorithm in Deep Space Measurement and Control Communication ［J］. Journal of Astronautics, 2014, 35 (12): 1437-1443.
［3］Leon W C. Digtal and analog communication systems［M］. NJ: Prentice-Hall, 1996: 461-473.
［4］Bernard S. 数字通信—基础与应用［M］. 2版. 北京: 电子工业出版社, 2002: 135-140.
［5］樊昌信, 曹丽娜. 通信原理［M］. 北京: 电子工业出版社, 2015:96-99.
［6］GJB 21. 1B-2006, 遥测标准第1部分: 无线电信道［S］. 2006.
［7］Chen C H. Note on Discriminator Detection of PCM/FM［J］. IEEE Transactions on Aerospace and Electronic Systems, 1968, AES-4(3): 478-479.
［8］Simon H. 通信系统(英文版)［M］. 4版. 北京: 电子工业出版社, 2012.
［9］Oshorne W P, Luntz M B. Coherent and Noncoherent Detection of CPFSK［J］. IEEE Transactions on Communications, 1974, 22(8): 1023-1036.
［10］Chen C H. Discriminator Detection of Wide-Band PCM/FM［J］. IEEE Transactions on Aerospace and Electronic Systems, 1969, AES-5(1): 126-127.
［11］Cong B. A Mathematical Expression of Bit Error Rate of PCM-FM using noncoherent Detection and its Analysis［C］//ICOCN2019. Huangshan,2019.
［12］盛骤, 谢试千, 潘承毅. 概率论与数理统计 ［M ］. 北京: 高等教育出版社, 2001: 78-123.
［13］周炯磐. 通信网理论基础 ［M ］. 北京: 人民邮电出版社, 1991: 116-148.
［14］吴从中. 数字通信系统中误码率的估计方法［J］. 合肥工业大学学报, 2002, 25(1): 113-116.
Wu C Z. Method for Estimating Bit Error Rate in Digital Communication System［J］. Journal of Hefei University of Technology, 2002, 25 (1): 113-116.
［15］夏新涛, 王中宇. 非统计假设检验原理及其应用［J］. 计量学报, 2006, 26(2): 190-195.
Xia X T, Wang Z Y. A Novel Non-Statistical Theory and Its Applications to Hypothesis Testing［J］. Acta Metrologica Sinica, 2006, 26(2): 190-195.
［16］Justin R. Calculating Statistical Confidence Levels forError-Probability Estimates［J］. Lightwave Magazine, 2000: 110-114.
［17］余清华,沈小青,从波,等. EVM可控的数字调制信号的产生方法研究［J］. 计量学报, 2020, 41(5): 608-613.
Yu Q H, Shen X Q, Cong B. et al. Research on Generation of Digital Modulation Signals with EVM Controllable
［J］. Acta Metrologica Sinica, 2020, 41(5): 608-613.
［18］郝润龙. 低水平放射性测量中探测限的实用公式［J］. 计量学报, 1983, 4(4): 303-310.
Hao R L. Pratical formula for the detection limit in low level radioactivity measurement［J］. Acta Metrologica Sinica, 1983, 4(4): 303-310.
PDF(630 KB)
