Performance Analysis of LDPC-Coded Diversity Combining on Rayleigh Fading Channels With Impulsive Noise

Zhen Mei, Martin Johnston, Stephane Le Goff, Li Chen
2017 IEEE Transactions on Communications  
Performance analysis of LDPC-coded diversity combining on rayleigh fading channels with impulsive noise. Abstract-Spatial diversity is an effective method to mitigate the effects of fading and when used in conjunction with lowdensity parity-check (LDPC) codes, it can achieve excellent errorcorrecting performance. Noise added at each branch of the diversity combiner is generally assumed to be additive white Gaussian noise, but there are many applications where the received signal is impaired by
more » ... oise with a non-Gaussian distribution. In this paper, we derive the exact bit-error probability of different linear combining techniques on Rayleigh fading channels with impulsive noise, which is modeled using symmetric alpha-stable distributions. The relationship for the signal-to-noise ratios of these linear combiners is derived and then different non-linear detectors are presented. A detector based on the bi-parameter Cauchy-Gaussian mixture model is used and shows near-optimal performance with a significant reduction in complexity when compared with the optimal detector. Furthermore, the threshold signal-to-noise ratio of LDPC codes for different combining techniques on these channels is derived using density evolution and an estimation of the waterfall performance of LDPC codes is derived that reduces the gap between simulated and asymptotic performance.
doi:10.1109/tcomm.2017.2683485 fatcat:zhx3fyk4jnfm3a2zejrhx6znae