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We develop a link adaptation scheme based on non-binary LDPC codes for two scenarios: a frequency-selective quasi-static channel and a time-selective flat fading channel with very limited channel state information at the transmitter. For both cases, we present a unified characterization of the coding performance including puncturing and repetition coding which is based on the accumulated mutual information...
In this paper, we consider frequency-selective adaptation from a link and a MAC layer perspective. In particular, we focus on the question of how to combine forward error correction with adaptive modulation and hybrid ARQ. The link adaptation scheme is then fitted into a packet-oriented multi-user OFDM system with a dynamic scheduler.
We consider the performance of adaptive coding and modulation (ACM) over a fading channel for the case that the transmitter has only partial channel state information (CSI). We evaluate the degradation due to the partial CSI in terms of additionally required SNR by simulations and an analytical approximation. Then, we propose an ACM scheme with fast link-level retransmissions based on cyclic incremental...
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