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This paper is concerned with the transmission strategies and relay selection for decode-and-forward Parallel Relay Networks (PRNs) based on superposition coding. The authors' focus is on the minimization of the aggregate transmission power that supports a given transmission rate. In this paper, two transmission strategies are investigated, i.e., an Optimal-Cooperation (OC) strategy requiring strict synchronization at the destination/relay nodes and a No-Information-Overlapping (NIO) strategy with no synchronization requirement for the ease of implementation using current technologies such as Interleave Division Multiple-Access (IDMA).
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