Abstract
In this study, the performance analyses of the proposed turbo-coded orthogonal frequency division multiplexing (T-COFDM) are investigated over the power-line communication with lognormal channel gain based on derived effective complex-valued ratio distributions of the individual and combined noise samples at the zero-forcing equaliser output. The effective noise samples are derived in the presence of Nakagami-m background interference (BI) noise, Middleton class A impulsive noise (MCAIN) and their combination. The performance of the turbo code has been improved by computing the exact log-likelihood ratio using derived distributions, with the derivation of pairwise error probability and the average upper-bounds (AUBs). Moreover, the bit error rate (BER) degradation in the conventional T-COFDM system has been improved by deriving two clipping thresholds to combat the effect of the non-Gaussian noise, the first one has been derived in the presence of the impulsive noise only modelled by MCAIN model and the second one in the presence of combined Nakagami-m BI noise and MCAIN model. Monte Carlo simulations demonstrate the significant BER improvements of the proposed T-COFDM system compared to the improved conventional T-COFDM system with a close agreement to the AUBs derivation and analytical BER expression.
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