Power-Constrained Bandwidth-Reduction Source-Channel Mappings for Fading Channels
The authors consider the transmission of a memoryless Gaussian source over a power-constrained Rayleigh fading channel with additive White Gaussian Noise. They propose the use of low-delay joint source-channel mappings and consider optimizing the non-parametric mappings through an iterative process. A design algorithm for joint source-channel mapping is proposed and numerically evaluated for 2:1, 3:1, and 4:1 bandwidth reductions. Parametric mappings are also studied. They assume three cases of fading knowledge; in the case of presence of channel state information at both encoder and decoder, optimal power allocation is solved for the parametric mappings in terms of fading gains and average power constraint.