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目的:面向具有深度衰落的电力线通信信道,分析具有网络编码功能的双向电力线中继系统的中断概率、误符号率以及平均信道容量。创新点:在电力线通信网络中使用一种两阶段的中继通协议,从而可以使用网络编码技术提高通信效率,并使用Hermite多项式推导出系统的性能指标。方法:首先,考虑电力线通信信道与传统信道的不同,针对具有脉冲噪声的电力线信道,建立具有编码功能的中继系统的系统模型(图1)。然后,针对建立的模型,分析接收端信噪比的表达式。应用电力线信道幅值的概率分布函数,推导接收端信噪比的概率分布函数。应用Hermite多项式推导出具有网络编码功能的双向中继系统的中断概率、误符号率以及平均系统容量。最后,根据实际的电力线系统建立仿真环境,在该环境中使用蒙特卡洛方法对推导的结果进行验证。仿真结果证明了推导的正确性。结论:针对具有深度衰落的电力线信道,提出一种可靠的具有网络编码功能的双向中继通信系统,提高系统的通信效率与通信可靠性。推导该系统中中断概率、无符号率以及平均系统容量的闭合式,仿真结果证明其正确性。
OBJECTIVE: To analyze the power line communication channel with deep fading, analyze the interrupt probability, symbol error rate and average channel capacity of the bidirectional power line relay system with network coding. Innovations: A two-phase relay protocol is used in power line communication networks to improve communication efficiency using network coding techniques and to derive system performance metrics using Hermite polynomials. Method: Firstly, considering the difference of power line communication channel and traditional channel, a system model of relay system with coding function is established for power line channel with impulse noise (Figure 1). Then, based on the established model, we analyze the SNR expression at receiver. The probability distribution function of power line channel amplitude is used to deduce the probability distribution function of signal-to-noise ratio at receiver. The Hermite polynomial is used to derive the outage probability, the symbol error rate and the average system capacity of two-way relay system with network coding. Finally, a simulation environment is established based on the actual power line system, in which the Monte Carlo method is used to verify the results. Simulation results prove the correctness of the derivation. Conclusion: For the power line channel with deep fading, a reliable bidirectional relay communication system with network coding is proposed to improve the communication efficiency and communication reliability of the system. The closed probability of the system, the unsigned rate and the average system capacity are derived. The simulation results prove its correctness.