Fountain codes over fading relay channels
IEEE Transactions on Wireless Communications
A comprehensive study of repetition-coded protocols in multi-user multi-relay networks
IEEE Transactions on Wireless Communications
Diversity-multiplexing-delay tradeoff of a DDF protocol on a half-duplex ARQ relay channel
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
The maximum achievable throughput of a decode-and-forward based hybrid-ARQ protocol
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
Cooperative ARQ techniques for wireless networks
Proceedings of the International Conference & Workshop on Emerging Trends in Technology
MIMO relaying in random linear coded multiple-access relay network
Proceedings of the 6th International Conference on Ubiquitous Information Management and Communication
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In this correspondence, the performance of the automatic repeat request-dynamic decode and forward (ARQ-DDF) cooperation protocol is analyzed in two distinct scenarios. The first scenario is the multiple access relay channel where a single relay is dedicated to simultaneously help two multiple access users. For this setup, it is shown that the ARQ-DDF protocol achieves the channel's optimal diversity multiplexing tradeoff (DMT). The second scenario is the cooperative vector multiple access channel where two users cooperate in delivering their messages to a destination equipped with two receiving antennas. For this setup, a new variant of the ARQ-DDF protocol is developed where the two users are purposefully instructed not to cooperate in the first round of transmission. Lower and upper bounds on the achievable DMT are then derived. These bounds are shown to converge to the optimal tradeoff as the number of transmission rounds increases.