Iterative Channel Estimation and Impulsive Noise Cancellation Algorithm in Power Line Communication
Date Issued
2014
Date
2014
Author(s)
Chen, Yu-Wu
Abstract
The multipath effect and impulsive noise (IN) of a power-line channel may affect the performance of power-line communications. Specifically, these two impairments reduce the accuracy of the channel estimation and increase the bit error rate (BER).
In this thesis, we focus on the Fast Fourier Transform –based orthogonal frequency-division multiplexing (FFT-based OFDM) receiver, which is defined in IEEE P1901 standard and propose an iterative receiver architecture.
Moreover, we devise an associated iterative channel estimation and IN cancellation algorithm for this receiver. Prior to the FFT operation, we pre-mitigate the IN by a nulling device to cancel the strong part of the IN sources. Furthermore, we mathematically derive the threshold of this nulling device according to the outlier detection theory. In addition, we propose using the value of the Kurtosis to decide whether to enable the pre-mitigation block or not. On the other hand, after the FFT operation, we iteratively post-mitigate the residual IN. The post-IN mitigation block iteratively cancel the residual IN and estimate the channel information, so that the channel estimation and IN mitigation are in a mutually beneficial status.
Simulation results show that the proposed iterative receiver not only increases the accuracy of the channel estimator, but also effectively cancel IN sources.
Subjects
電力線通訊
正交分頻多工
脈衝式雜訊
Type
thesis
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