(Accepted, May 2017) Linear Precoded Wavelet OFDM based PLC System with Overlap FDE for Impulse Noise Mitigation
In recent years, power lines have gained significant interest for their use in high-speed communications because of the already deployed power distribution infrastructure. However, to achieve high data rates with reliability in power line communication (PLC), robust signal processing techniques are required to mitigate channel distortion and noise. Orthogonal frequency division multiplexing (OFDM) as a multicarrier modulation (MCM) technique has been standardized for PLC; however, to further enhance the quality of communication, wavelet OFDM (WOFDM) has been proposed as a suitable choice. In this article, OFDM-based and WOFDM-based PLC systems are studied and overlap frequency domain equalization (OFDE) as a robust and efficient equalization technique is presented. Moreover, to enhance the efficiency of the OFDE, linear precoding (LP) is also suggested for fast Fourier transform (FFT) and wavelet transform based filter bank transceivers over the PLC channel. Performance of the proposed LP based OFDM-OFDE and LP based WOFDM-OFDE systems is compared with previously proposed equalization structures in terms of bit error rate (BER), peak-to-average power ratio (PAPR), and computational complexity via computer simulations. Furthermore, the performance of proposed architectures is also compared with classical equalization techniques under impulse noise with different intensities. Results show that the proposed LP based WOFDM-OFDE transceiver not only performs better than the previous equalization models but also LP based OFDM-OFDE at the expense of slight increment in computational complexity.