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Explicit codes are constructed that achieve the diversity-multiplexing gaintradeoff of the cooperative-relay channel under the dynamic decode-and-forwardprotocol for any network size and for all numbers of transmit and receiveantennas at the relays.  A particularly simple code construction that makes use of the Alamouti codeas a basic building block is provided for the single relay case.  Along the way, we prove that space-time codes previously constructed in theliterature for the block-fading and parallel channels are approximatelyuniversal, i.e., they achieve the DMT for any fading distribution. It is shownhow approximate universality of these codes leads to the first DMT-optimum codeconstruction for the general, MIMO-OFDM channel.

Approximately-Universal Space-Time Codes for the Parallel, Multi-Block and Cooperative-Dynamic-Decode-and-Forward Channels