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Performance of an M-QAM full-duplex wireless system with a nonlinear amplifier

非线性功放对M-QAM全双工无线通信的影响分析

Abstract

The effect of amplifier nonlinearity is analyzed for M-QAM full-duplex communications in additive white Gaussian noise channels. Two classical memoryless nonlinear amplifier models, i.e., a traveling-wave tube amplifier and a solid-state power amplifier, are considered. An analytical expression for the bit error ratio is derived using a characteristic function and numerical integration. Theoretical results show perfect agreement with those obtained by simulation. The analytical results could be used to evaluate the degradation in performance of an M-QAM full-duplex system caused by amplifier nonlinearity, and will be helpful in finding the optimal static operating point of an amplifier.

摘要

创新点

本文分析了非线性功放对M-QAM全双工无线通信性能的影响; 采用行波管功放(TWTA)模型和固态功放(SSPA)模型, 并通过特征函数和数值积分的方法求出M-QAM全双工无线通信误码率的表达式, 最终用仿真验证了理论分析的正确性。本文结论可用于估算M-QAM全双工无线通信中非线性功放带来的信噪比损失, 以及为非线性功放选择最佳的静态工作点。

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Correspondence to Youxi Tang.

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He, Z., Ma, W., Shao, S. et al. Performance of an M-QAM full-duplex wireless system with a nonlinear amplifier. Sci. China Inf. Sci. 59, 102307 (2016). https://doi.org/10.1007/s11432-015-5370-2

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Keywords

  • full-duplex
  • amplifier nonlinear distortion
  • bit error ratio
  • amplitude error
  • phase error

关键词

  • 全双工
  • 非线性功放
  • 误码率
  • 幅度误差
  • 相位误差