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Consider the case where a source wishes to reliably deliver a number of data packets to the destination with the help of a demodulate-and-forward relay. The authors discuss two retransmission schemes, each of which can ensure that the packets from the source will be delivered to the destination without error. They first discuss a scheme that combines signals from the source and the relay at the destination using a weighed combiner. The use of network coding which facilitates the retransmission process is then proposed.
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