Analysis and comparison of several simple impulsive noise mitigation schemes for OFDM receivers

A simple method of improving OFDM (orthogonal frequency division multiplexing) receiver performance in an impulsive noise environment is to precede a conventional OFDM demodulator with memoryless nonlinearity. This scheme is popular in practical OFDM applications since it is very simple to implement and provides an improvement in channels with impulsive noise. In this paper, we analyze and compare the performances of OFDM receivers with blanking, clipping and combined blanking-clipping nonlinearities in the presence of impulsive noise. Closed-form analytical expressions for the signal-tonoise ratio (SNR) at the output of these types of nonlinearity are derived. We also study asymptotical behavior of these schemes and potential processing gain. Simulation results are provided that show good agreement with theory.

• Type: Journal
• Year: 2008
• Where: TCOM
• Authors: S. V. Zhidkov
• Keywords: Impulsive Noise, Impulsive Noise Environment, OFDM, TCOM 2008