Abstract
Abstract Relay cooperation can enhance coverage, throughput, and reliability of wireless communication systems, thus attracting intense research interest in the past decade. However, most of them focused on half-duplex relay systems, which encounter loss of resource efficiency. With the progress of self-interference cancellation technologies, full-duplex relay systems come into sight. In this paper, outage performances of the primary system and the secondary system in a cognitive full-duplex relay network are analyzed, under the adverse effect of self-interference caused by the signals at the transmitting and receiving antennas of the relay. The full-duplex decode-and-forward relay assists the transmissions of the primary system and the secondary system where there is no direct link between the secondary transmitter and the secondary receiver. Simulation results show that better outage performance of the primary system is achieved compared with the cognitive relay network adopting half-duplex relaying. Moreover, communication of the secondary system is realized on the condition that the secondary transmission link is non-ideal.
Highlights
Modern radio resource management is faced with the challenge of adapting to the increasing number of wireless applications and services on the limited amount of spectrum
We propose a spectrum-sharing protocol for a cognitive full-duplex relay network taking the selfinterference into account
In this cognitive relay network, outage performance of the primary system benefits from the assistance of the Relay, and communication of the secondary system is achieved with the assistance of the Relay when no direct link between the secondary transmitter and the secondary receiver is assumed [15]
Summary
Modern radio resource management is faced with the challenge of adapting to the increasing number of wireless applications and services on the limited amount of spectrum. The half-duplex relaying refers to the inability of the modems to transmit and receive signals in the same frequency band at the same time This limitation results in inefficient use of system resources (bandwidth loss) [13]. The authors proposed a two-phase protocol for relay-assisted transmissions in a cognitive relay network and calculated outage probabilities of the primary system and the secondary system separately. It is assumed that the secondary system follows the same radio protocols (e.g., coding, synchronization) as the primary system In this cognitive relay network, outage performance of the primary system benefits from the assistance of the Relay, and communication of the secondary system is achieved with the assistance of the Relay when no direct link between the secondary transmitter and the secondary receiver is assumed [15].
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