Code design for multihop wireless relay networks
EURASIP Journal on Advances in Signal Processing
EURASIP Journal on Advances in Signal Processing
Cyclic Division Algebras: A Tool for Space-Time Coding
Foundations and Trends in Communications and Information Theory
Co-ordinate interleaved distributed space-time coding for two-antenna-relays networks
IEEE Transactions on Wireless Communications
Cyclic distributed space-time codes for wireless relay networks with no channel information
IEEE Transactions on Information Theory
Opportunistic Relaying for MIMO Amplify-and-Forward Cooperative Networks
Wireless Personal Communications: An International Journal
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We consider the problem of coding over a half-duplex wireless relay network where both the transmitter and the receiver have respectively several transmit and receive antennas, whereas each relay is a small device with only a single antenna. Since, in this scenario, requiring the relays to decode results in severe rate hits, we propose a full rate strategy where the relays do a simple operation before forwarding the signal, based on the idea of distributed space-time coding. Our scheme relies on division algebras, an algebraic object which allows the design of fully diverse matrices. The code construction is applicable to systems with any number of transmit/receive antennas and relays, and has better performance than random code constructions, with much less encoding complexity. Finally, the robustness of the proposed distributed space-time codes to node failures is considered.