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In this paper, the authors consider an Automatic-Repeat-reQuest (ARQ) retransmission protocol signaling over a block-fading Multiple-Input - Multiple-Output (MIMO) channel. Unlike previous work, they allow for multiple fading blocks within each transmission (ARQ round), and they constrain the transmitter to fixed rate codes constructed over complex signal constellations. In particular, they examine the general case of average input-power-constrained constellations with a fixed signaling alphabet of finite cardinality. This scenario is a suitable model for practical wireless communications systems employing Orthogonal Frequency Division Multiplexing (OFDM) techniques over a MIMO ARQ channel.
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