Abstract
A concatenated two-stage adaptive error control scheme with automatic repeat request (ARQ) has been developed which is especially suitable for severely fading channels and for a very broad range of signal-to-noise ratios. This new scheme uses two stages of adaptive coding: the inner code is a rate compatible binary block code which due to its short blocklength can be maximum likelihood decoded taking into account soft-decisions and channel state information. For retransmissions code combining can be used. The outer code is a Reed-Solomon code which is maximum-distance separable and can correct error bursts as well as erasures indicated by the inner decoder. No interleaving is necessary and no critical optimization of system parameters is required to adapt to different channels and signal-to-noise ratios. In the paper, the scheme is described in detail and its throughput efficiency is analyzed. Also, simulation results for the throughput in the Gaussian and in the Rayleigh channel are presented. It is shown that the proposed error control scheme offers excellent throughput performance. Compared to other schemes, the new scheme maintains its efficiency over a very broad range of signal-to-noise ratios.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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