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A cooperative multi-path relay channel (MPRC) with multiple decode-and-forward relay terminals is considered in this paper. In order to enhance the system reliability, the source is encouraged to transmit at a higher power such that more relays can successfully decode the source symbol. This, however, may lead to unnecessary energy waste. For reliable symbol delivery while improving the system energy...
A cognitive spectrum sharing protocol based on the two-path relay channel is proposed in this paper, where a primary transmitter keeps transmitting new messages to a corresponding receiver and two secondary users alternately decode-and-forward (DF) the primary messages. Upon successful decoding of the primary message, each secondary user superimposes its own message on the relayed message through...
We consider a cognitive spectrum sharing system on an interference channel with a cognitive relay (IFC-CR) assisting both the primary and secondary users in forwarding their messages to the respective destination nodes. The CR uses a successive interference cancelation scheme to decode the primary and secondary messages after a first transmission phase. The CR performs power allocation and in the...
We consider spectrum sharing in a cognitive radio network where a secondary user co-exists with an ARQ-based primary user. A spectrum sharing protocol is proposed where the secondary user switches between cooperation and access modes. In the cooperation mode, the secondary system serves as a relay to assist the primary transmission, and in return accumulates credits. The credits allow the secondary...
This paper analyzes the outage performance of cooperative protocols for the two-way relaying model in which a halfduplex relay assists in the bi-directional communications of two terminals. We first define the outage events of conventional nonadaptive Amplify-and-Forward (AF) and Decode-and-Forward (DF) two-way relaying protocols and derive closed form results for their respective outage probabilities...
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