2020/11/05 by Nikola Rožić, Rozic, Nikola, Paolo Banelli +5
Engineering · #Power Line Communications and Noise #Electromagnetic Compatibility and Noise Suppression #Advanced Adaptive Filtering Techniques
paper · pdf · doi:10.48550/arxiv.2011.02792
Theoretical analysis of orthogonal frequency division multiplexing (OFDM)\nsystems equipped at the receiver by a non-linear impulsive noise suppressor is\na challenging topic in communication systems. Indeed, although an exact\nclosed-form expression for the output signal-to-noise ratio (SNR) of such OFDM\nsystems is available for widely used impulsive noise models, theoretical\nanalysis of the associated symbol error rate (SER) is still open. So far, the\nanalytical SER expressions available in the literature approximate the\ntime-domain impulsive noise, as Gaussian distributed in the discrete frequency\ndomain. Conversely, this work presents an accurate analysis of the distortion\nnoise at the nonlinearity output exploiting a Gaussian mixture model (GMM). By\nusing GMMs we unified the approach of SER prediction for unmitigated systems,\nas well as for the mitigated ones, equipped by non-linear impulsive noise\nsuppressors, including blanking, clipping, clipping-blanking and attenuating\nprocessors. Closed form expressions for the SER are derived both for non-fading\nand frequency-selective Rayleigh and Rician fading channels affected by\nimpulsive noise which is represented by GMMs, thus including Bernoulli-Gaussian\n(BG), Middleton Class-A, as well as (approximated) alpha-stable noise.\nTheoretic SER performance are compared with simulations, showing very good\nagreement for all the impulsive noise scenarios and the non-linear suppressors.\n