A New Approach to Peak Threshold Estimation for Impulsive Noise Reduction Over Power Line Fading Channels
A New Approach to Peak Threshold Estimation for Impulsive Noise Reduction Over Power Line Fading Channels
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DOI：
10.1109/jsyst.2018.2808230
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发表时间：
2019-06
影响因子：
4.4
通讯作者：
B. Adebisi;K. Anoh;Khaled Maaiuf Rabie;Augustine Ikpehai;Michael Fernando;A. Wells
中科院分区：
文献类型：
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作者：
B. Adebisi;K. Anoh;Khaled Maaiuf Rabie;Augustine Ikpehai;Michael Fernando;A. Wells
在电力线通信(PLC)系统中，脉冲噪声(IN)是降低信号完整性的主要成分。由正交频分复用(Ofdm)驱动的PLC系统具有瑞利分布的幅度。基于每个符号的动态特性，该符号的峰值幅度最近被证明是检测IN的合适阈值，并且该技术的性能优于传统的最佳消隐(COB)方案。在这项研究中，我们通过将默认的瑞利分布转换为均匀分布来改进基于动态峰值的门限估计(DPTE)方案，该方案依赖于ofdm瑞利分布幅度，以揭示低于传统峰值信号的功率水平的IN。然后，我们使用消隐对幅度超过均匀分布幅度的接收信号进行非线性缓解处理，我们将这种方案称为均匀分布DPTE(U-DPTE)。在输出信噪比(SNR)方面，我们的结果(基于U-DPTE)显著优于DPTE方案高达4dB的增益。此外，与以前的DPTE研究不同，我们提出了一种新的门限准则，该准则补偿了高斯噪声功率电平放大(均衡后)，以在对数正态多径衰落信道中获得最优信噪比。结果进一步揭示了DPTE方案相对于COB方案的次优性。
Impulsive noise (IN) is a major component that degrades signal integrity in power line communication (PLC) systems. PLC systems driven by orthogonal frequency-division multiplexing (OFDM) have Rayleigh distributed amplitudes. Based on the dynamic nature of each OFDM symbol, peak amplitude of the symbol was recently shown to be a suitable threshold for detecting IN, and this technique outperforms the conventional optimal blanking (COB) scheme. In this study, we improve the dynamic peak-based threshold estimation (DPTE) scheme that relies on the OFDM Rayleigh distributed amplitudes by converting the default Rayleigh distribution to uniform distribution to unveil IN with power levels below that of the conventional peak signal. Then, we perform nonlinear mitigation processing on the received signals, whose amplitudes exceed the uniformly distributed amplitude using blanking, a scheme we will refer to as uniformly distributed DPTE (U-DPTE). Our results (based on U-DPTE) significantly outperform the DPTE scheme by up to 4-dB gain in terms of output signal-to-noise ratio (SNR). Additionally and unlike earlier DPTE studies, we propose a novel threshold criterion that compensates the Gaussian noise power-level amplification (after equalization) for achieving the optimal SNR over a log-normal multipath fading channel. The results further reveal the suboptimality of the DPTE scheme over COB.