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Diversity Multiplexing Tradeoff of Asynchronous Cooperative Relay Networks (0807.0204v1)
Published 1 Jul 2008 in cs.IT and math.IT
Abstract: The assumption of nodes in a cooperative communication relay network operating in synchronous fashion is often unrealistic. In the present paper, we consider two different models of asynchronous operation in cooperative-diversity networks experiencing slow fading and examine the corresponding diversity-multiplexing tradeoffs (DMT). For both models, we propose protocols and distributed space-time codes that asymptotically achieve the transmit diversity bound for all multiplexing gains and for any number of relays.