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In this paper, the authors analyze several protocols for Gaussian half-duplex multiple relay networks where each node either transmits or receives on a particular resource. They present achievable rates for a multilevel partial decode-and-forward approach which generalizes previous results presented by Kramer and Khojastepour et al.. Furthermore, they present a compress-and-forward protocol and a mixed strategy which use a regular encoding scheme. Finally, they discuss results for a four-terminal line network and compare the performance for fixed and random transmission strategies as well as for coherent and non-coherent transmission.
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