Some New Adaptive Protocols for the Wireless Relay Channel
Bin Zhao, Matthew C. Valenti · 2003
The AWGN capacity is given for several adaptive relaying schemes. A constraint is imposed that requires the source and relay to transmit orthogonally through time division duplexing, which divides each transmission into two time slots. During the first slot, the source always transmits. During the second slot, either the source will continue to transmit or the relay will forward using either a decode-forward or amplify-forward rule. The criterion used to select which node transmits during the second slot and the relaying rule is what distinguishes the various protocols.