多載波電力線(xiàn)通信系統(tǒng)脈沖噪聲處理方法研究
Signal Processing Algorithm for Multi-carrier Middle-Voltage Distribution Line Channel with Impulse Noise
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摘要: OFDM用于實(shí)現(xiàn)高速電力線(xiàn)通信已經(jīng)越來(lái)越受關(guān)注。脈沖噪聲是電力線(xiàn)信道的主要干擾之一，它是突發(fā)性、高幅度和低概率的噪聲。持續(xù)時(shí)間很短的脈沖包含了所有子信道的頻譜成分，會(huì)影響所有子信道上傳輸符號(hào)的判決。該文分析了時(shí)域和頻域兩種檢測(cè)算法的虛警率和漏檢率等性能，提出接收機(jī)通過(guò)計(jì)算時(shí)域和頻域中接收符號(hào)的幅值來(lái)檢測(cè)脈沖的存在及其在OFDM符號(hào)內(nèi)的起始位置。被脈沖噪聲污染的樣本利用保護(hù)頻帶的冗余來(lái)進(jìn)行恢復(fù)，仿真結(jié)果顯示在選擇合適的閾值的情況下，該算法在低信噪比下取得了良好的性能增益。Abstract: OFDM has received a considerable attention for realization of high-speed power line communications. Impulse, one of the main disturbances in power line, is a type of bursty, high amplitude, and low probability noise. Such impulses with very short duration will contain spectral components on all subchannels, and thus impact the decision of symbols transmitted on all subcarriers. This paper analyzes the performance of selected impulse noise detectors. The receiver detects impulse emergence and its position within an OFDM symbol by amplitude calculation combined in time and frequency domain. Samples corrupted by impulse noise are reconstructed using redundancy of the guard band in the frequency domain. Simulation results show that the proposed algorithm has a good performance for low signal-to-noise ratios, if the proper threshold is selected.
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