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We study irregular binary turbo codes over nonergodic block-fading channels. We first propose an extension of channel multiplexers initially designed for regular turbo codes. We then show that, using these multiplexers, irregular turbo codes that exhibit a small decoding threshold over the ergodic Gaussian-noise channel perform very close to the outage probability on block-fading channels, from both...
In this paper we examine the use of low-density parity-check (LDPC) codes in binary asymmetric channels. The problem is interesting since in some types of binary input fading multiple access channels (MAC) without channel state information (CSI), which use the successive decoding scheme, some of the users may experience asymmetric channels. It is well known that the successive decoder is a set of...
Monotonicity criteria are established for the generalized Marcum Q-function QM (alpha, beta) and the standard Nuttall Q-function QM,N (alpha, beta). Specifically, we present that QM (alpha, beta) is monotonically increasing with regard to its order M, for all ranges of the parameters alpha, beta, whereas QM,N (alpha, beta) possesses analogous monotonicity behavior with respect to M + N, under the...
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