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High amplitude impulsive noise (IN) occurrence over power line channelsseverely degrades the performance of Orthogonal Frequency Division Multiplexing(OFDM)systems. One of the simplest methods to reduce IN is to precede the OFDMdemodulator with a blanking non-linearity processor. In this respect, SelectiveMapping (SLM) applied to an OFDM signal before the transmitter does not onlyreduce Peak-to-Average Power Ratio (PAPR) but also increases the resultingSignal-to-Noise Ratio (SNR) when blanking nonlinearity is applied at thereceiver. This paper highlights another advantage of SLM based IN reduction,which is the reduced dependency on threshold used for blanking nonlinearity.The simulation results show that the optimal threshold to achieve maximum SNRis found to be constant for phase vectors greater than or equal to 64 in theSLM scheme. If the optimized threshold calculation method is used, the outputSNR with SLM OFDM will result in SNR gains of up to 8.6dB compared to theunmodified system, i.e. without implementing SLM. Moreover, by using SLM, wenot only get the advantage of low peak power, but also the need to calculateoptimized threshold is eliminated, thereby reducing the additional computation.

Analysis of Optimized Threshold with SLM based Blanking Non-Linearity for Impulsive Noise Reduction in Power Line Communication Systems