The Performance of OFDM with Blanking Nonlinearity in Impulsive and Gaussian Noise


The aim of this paper is to investigate the effect of impulsive noise on the performance of the OFDM (orthogonal frequency division Multiplexing) system. The employed model of impulsive noise consists of Bernoulli distributed impulsive arrivals and Gaussian distributed amplitudes of the impulses. A simple method of improving OFDM receiver performance in an impulsive noise environment is to precede a conventional OFDM demodulator with blanking nonlinearity.
The effect of changing impulsivity of noise and different relative power of impulsive noise are investigated and are compared with Additive Whit Gaussian Noise (AWGN) case. Also the performance of the OFDM receiver with blanking nonlinearity in the presence of impulsive noise will be studied.
Closed form analytical expressions for the signal-to-noise ratio (SNR) at the output of blanking nonlinearity and the optimal blanking threshold that maximizes SNR are derived.