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In this paper, we propose an energy-harvesting based decode-and-forward multi-hop cognitive relay protocol, where secondary users harvest energy from the radio frequency signals transmitted by multiple dedicated power beacons (PBs) to support the information transmission. The secondary transmitters including source and relays must adjust their transmit power to satisfy interference power constraints...
In this paper, we investigate two partial relay selection (PRS) protocols in underlay cognitive radio under impact of hardware impairment. In particular, the re-active and pro-active PRS schemes are proposed to compensate the performance loss due to the hardware noises and the interference constraints required by multiple primary users (PUs). Moreover, incremental relaying technique is also used to...
In this paper, we study secrecy outage performance of dual-hop relay protocols in underlay cognitive radio network. In particular, we derive exact and asymptotic closed-form expressions of secrecy outage probability for randomize-and-forward and decode-and-forward schemes over Rayleigh fading channel. The derivations are then verified by Monte Carlo simulations.
In this paper, we propose a hybrid spectrum sharing approach in cognitive radio networks. If the primary network satisfies the required quality of service (QoS), an underlay approach can be applied for the secondary network. Otherwise, the secondary network must help primary network obtain the QoS and hence it must operate on overlay mode. We also derive the closed-formed expressions of the outage...
Selection decode-and-forward (DF) relaying and incremental relaying were introduced as efficient relaying protocols to increase capacity and performance of cooperative diversity networks. This paper proposes an incremental relaying in conjunction with selection DF and provides its performance in terms of outage probability and bit error probability. Our proposed protocol offers a good trade off between...
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