电力线通信系统中抗脉冲噪声的信道估计算法
摘要
在电力线通信(power line communication,PLC)系统中脉冲噪声对信道估计造成了严重影响,对此常用的方法是在信道估计之前前置一个时域非线性处理单元,但其性能并不理想。针对该问题,首先提出了一种新颖的脉冲噪声检测方法,在此基础上提出一种时频域结合抵抗脉冲噪声的信道估计算法。该算法首先利用所提脉冲噪声检测算法在时域消除幅值较大的脉冲噪声,以获得较准确的信道估计初始值,然后在频域迭代消除剩余脉冲噪声对信道估计的影响。仿真结果表明,同样环境下与改进前的信道估计算法相比,该算法性能改善明显,显著提升了该系统的误码性能。
引文
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2 吕海峰,王赞基,郭静波,等.电力线正交频分复用通信的实时信道估计[J].电力系统自动化,2003,27(09):29-31,36
3 Zhidkov S V.Analysis and comparison of several simple impulsive noise mitigation schemes for OFDM receivers[J].IEEE Transactions on Communications,2008,56(1):5-9
4 Papilaya V N,Vinck A J H.Investigation on a new combined impulsive noise mitigation scheme for OFDM transmission[C]//IEEE International Symposium on Power Line Communications and ITS Applications.2013:86-91
5 Juwono F H,Guo Q,Huang D,et al.Deep Clipping for Impulsive Noise Mitigation in OFDM-Based Power-Line Communications[J].IEEE Transactions on Power Delivery,2014,29(3):1335-1343
6 Kim Y,Bae J N,Jin Y K.Performance of power line communication systems with noise reduction scheme for smart grid applications[J].IEEE Transactions on Consumer Electronics,2011,57(1):46-52
7 Zhidkov S V.Impulsive noise suppression in OFDMbased communication systems[J].IEEE Transactions on Consumer Electronics,2003,49(4):944-948
8 Zimmermann M,Dostert K.A multipath model for the powerline channel[J].IEEE Transactions on Communications,2002,50(4):553-559
9 Ghosh M.Analysis of the effect of impulse noise on multicarrier and single carrier QAM systems[J].IEEE Transactions on Communications,1996,44(2):145-147
10 Guo J,Wang Z.Spread Spectrum Signal Transmission Over Low Voltage Distribution Networks and Realization Countermeasures of the Communication System[J].Proceedings of the Csee,2001,21(7):78-82
11 Aburakhia S A,Badran E F,Mohamed D A.Distribution of the PAPR for Real-Valued OFDM Signals[C]//International Conference on Information Technology.2009:2
12 Cortes J A,Canete F J,Diez L,et al.On PLC channel models:An OFDM-based comparison[C]//IEEE International Symposium on Power Line Communications and ITS Applications.IEEE,2013:333-338