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Distributed orthogonal space-time coding: design and outage analysis for randomized cooperation

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2007年第12期6卷 4546-4557页

作者： Savazzi, Stefano Spagnolini, Umberto Politecn Milan Dipartimento Elettr & Informat I-20133 Milan Italy

In this paper we consider a cooperative wireless network where each terminal communicates to a destination node with the aid of multiple relaying nodes. The focus is on cooperative transmission protocols that are based on the simultaneous transmission by a number of cooperating nodes. Outage performances are analyzed by assuming a Distributed Randomized Orthogonal space-time coding scheme (DR-OSTC) to be employed by the relaying terminals during the transmission session. The DR-OSTC scheme requires that each cooperating node chooses randomly and independently to serve as one of the space-time virtual antennas. By avoiding any pre-defined terminal-to-codeword mapping, the random selection of the space-time codewords substantially reduces the needed control overhead with respect to other distributed space-time coding strategies simplifying the node coordination task. According to this scheme, in this paper it is tackled the problem of designing both, the minimum number of cooperating nodes M and the spatial dimension L of the space-time code matrix so as to meet a specific outage probability requirement at the destination. Outage performances are also analyzed by developing simple but effective design rules tailored for two cooperative trasmission protocols in realistic propagation environments.

关键词： distributed space-time coding cooperative diversity space-time coding design ad-hoc and sensors networks wireless networks

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