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—We design multilevel coding (MLC) and bit-inter-leaved coded modulation (BICM) schemes based on low-density parity-check (LDPC) codes. The analysis and optimization of the LDPC component codes for the MLC and BICM schemes are complicated because, in general, the equivalent binary-input component channels are not necessarily symmetric. To overcome this(More)
— The average signal-to-noise ratio (SNR) of a generalized selection combining scheme, in which the m diversity branches (m L, where L is the total number of diversity branches available) with the largest instantaneous SNR's are selected and coherently combined, is derived. A Rayleigh fading channel is assumed, and a simple closed-form expression for the(More)
A numerical method has recently been presented to determine the noise thresholds of low density parity-check (LDPC) codes that employ the message passing decoding algorithm on the additive white Gaussian noise (AWGN) channel. In this paper, we extend this technique to the uncorrelated at Rayleigh fading channel. Using a nonlinear code optimization(More)
—In this paper, we study the correlation properties of the fading mobile radio channel. Based on these studies, we model the channel as a one-step Markov process whose transition probabilities are a function of the channel characteristics. Then we present the throughput performance of the Go-Back-N and Selective-Repeat ARQ protocols with timer control,(More)