不同调制方式干扰对LTE-M的性能影响分析
张科博1邹劲柏1,2张海娟1
Influence of Different Modulation Interference on LTE-M Performance
ZHANG KeboZOU JinbaiZHANG Haijuan
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作者信息:1.上海应用技术大学轨道交通学院，201400，上海；
2.同济大学电子与信息工程学院，201804，上海
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Affiliation:Shanghai Institute of Technology, 201400, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2020.08.034
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中图分类号/CLCN:U285.2
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栏目/Col:研究报告
摘要:
LTE(长期演进)技术是城市轨道交通车地无线通信的重要发展方向，分析了LTE-M(城市轨道交通车地综合通信系统)在不同调制方式干扰下的解调传输性能。LTE-M系统采用了高阶QAM(正交幅度调制)基带调制解调技术，通过建立QAM的系统模型，分析了16-QAM信号在信道背景噪声为AWGN(加性高斯白噪声)下的传输性能，并在此基础上推导出不同调制下的干扰对M-QAM(多进制正交幅度调制)的误比特率通用公式。研究16-QAM的传输性能，分析相位差对干扰效能影响程度。仿真结果表明：16-QAM信号的解调传输性能受QPSK(正交相移键控)调制干扰信号影响最大；16-QAM与QPSK调制干扰信号存在相位偏移，相比AWGN干扰，QPSK调制干扰下，16-QAM解调传输性能会变差；干扰信号的不同相位偏移对系统误比特率影响变化较小。
Abstracts:
LTE (long term evolution) technology is an important direction for urban rail transit train-ground wireless communication development. The demodulation performance of LTE-M ( LTE metro) system under interference of different modulation is analyzed, it adopts high-order QAM (quadrature amplitude modulation) baseband modulation and demodulation technology. By establishing a QAM system model, the performance of 16-QAM signal in the channel noise of AWGN (additive white Gaussian noise) is analyzed, on top of which, the general BER formula of M-QAM system interference under different modulation is deduced. Through studying the transmission performance of 16-QAM, the effect of phase difference on interference performance is analyzed. The simulation results show that the demodulation and transmission performance of the 16-QAM signal is most affected by the QPSK modulated interference signal. Since the 16-QAM and QPSK (quadrature phase shift keying) modulated interference signals have a phase shift, compared to AWGN interference, the 16-QAM demodulation and transmission performance will deteriorate under QPSK modulation interference. The different phase offsets of interfering signal have little effect on the system BER (bit error ratio).
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