Vol.3 No.5 (October 2013)
A Study on Channel Estimation in Impulsive NB-PLC Channels
The additive impulsive noise is one of the serious interferences in narrow band power line communication (NB-PLC). With the widely used OFDM (Orthogonal Frequency Division Multiplexing) technology, the influence of the impulsive noise can spread to every subcarrier after DFT in the receiver, which degrades the communication per- formance seriously. Therefore, a simple and effective interference cancelation scheme is required, for example, blanking nonlinearity has been widely used to suppress the impulsive noise due to its convenient operation. However, the nonli- near operation introduces inter-carrier interference (ICI), resulting in degradation in both system performance and the precision of channel estimation. In this paper, a new channel estimation method for OFDM transmission is proposed to reduce the affection of impulsive noise in power line channel, where the ICI part in the estimated channel response function can be iteratively cancelled. The simulation results show that the proposed method can improve the precision of channel estimation and reduce the bit error ratio (BER) significantly at the same time.
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