Capacity Analysis of Cognitive Relay Networks with the PU's Interference

Si, Jiangbo; Li, Zan; Huang, Haiyan; Chen, Junjie; Gao, Rui

doi:10.1109/lcomm.2012.111412.121978

Cited by 51 publications

(48 citation statements)

References 13 publications

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“…Motivated by the great benefits acquired through cognitive radio and cooperative techniques, several works analyzed the performance of cooperative cognitive networks under spectrum sharing constraints, as for instance [18][19][20][21][22][23][24][25][26][27][28][29]. Nevertheless, a common characteristic of these works is that all proposed schemes operate under HD mode with exception of [29].…”

Section: Cooperative Cognitive Networkmentioning

confidence: 99%

“…Correspondingly, in [25], outage probability and ergodic capacity are evaluated constrained by the interference of the primary network. The authors show that the interference can be combated with the inclusion of more relays at the secondary network.…”

Section: Cooperative Cognitive Networkmentioning

confidence: 99%

“…Even though we acknowledge the extensive contributions of the previous works [18][19][20][21][22][23][24][25][26][27][28], it should be emphasized that they only considered HD relays, which is spectrally inefficient due to multiplexing loss. Thus, conversely to all previous works, in [29], the authors considered a scenario in which the secondary cooperative network utilizes a FD relay subject to self-interference.…”

Section: Cooperative Cognitive Networkmentioning

confidence: 99%

See 2 more Smart Citations

On the performance of cognitive full-duplex relaying under spectrum sharing constraints

Mafra

Alves

Costa

et al. 2015

J Wireless Com Network

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In this paper, a new full-duplex (FD) relaying scheme for a cooperative cognitive underlay network is proposed. The secondary network is composed of one secondary transmitter, one full-duplex secondary relay, and one secondary destination. The relay employs the selective-decode-and-forward (SDF) protocol. The secondary destination jointly decodes the signals from the secondary transmitter and the FD secondary relay so that the direct link can be seen as useful information rather than interference. The analysis includes the effect of the interference from the primary transmitter and the self-interference at the relay. Under equal power allocation strategy, closed-form expressions for the outage probability are derived for the proposed FD cooperative cognitive scheme, and the feasibility of FD relaying under cognitive constraints is shown. Our results also reveal that the proposed full-duplex joint-decoding (FDJD) cognitive network considerably outperforms the known full-duplex dual-hop (FDDH) scheme. Moreover, we propose an optimal power allocation (OPA) scheme. On the basis of the signal-to-interference-plus noise of the secondary network, the OPA strategy can choose between two modes of operation, cooperation between source and relay or source transmission only. Our results show that the FDJD scheme under the proposed OPA policy presents the best performance among all schemes investigated in this paper.

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Section: Cooperative Cognitive Networkmentioning

confidence: 99%

Section: Cooperative Cognitive Networkmentioning

confidence: 99%

Section: Cooperative Cognitive Networkmentioning

confidence: 99%

See 1 more Smart Citation

On the performance of cognitive full-duplex relaying under spectrum sharing constraints

Mafra

Alves

Costa

et al. 2015

J Wireless Com Network

View full text Add to dashboard Cite

show abstract

“…In [15], the authors have studied the capacity of the secondary users in cognitive relay networks, and proved that the reactive DF scheme is able to achieve the similar capacity of the proactive DF scheme. The performances of the secondary users in cognitive relay networks with the consideration of the primary users' interference have been analyzed in [16][17][18]. Especially, the authors of [17] have considered the outage performances of the primary and secondary systems on the condition that there exists a direct link between the secondary users.…”

Section: Introductionmentioning

confidence: 99%

Outage performance of relay-assisted primary and secondary transmissions in cognitive relay networks

Zhao

Sun

Chen

et al. 2014

J Wireless Com Network

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In this paper, a two-phase protocol for relay-assisted spectrum sharing in cognitive relay network is proposed. The primary system comprises a transmitter-receiver pair (PT-PR) and a decode-and-forward relay (Relay), while the secondary system comprises a transmitter-receiver pair (ST-SR). In the proposed protocol, the Relay assists the transmissions of the primary users as well as the secondary users where there is no direct link between the ST and the SR. Outage probabilities of the primary system and the secondary system are derived and verified through simulations. Compared with the protocol without cooperation, better outage performance of the primary system is achieved. Meanwhile, though the ST causes interference to the PR, the interference is compensated by the cooperation of the Relay. Moreover, the proposed protocol realizes the communications of the secondary users on the condition that the secondary transmission link is not ideal.

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“…The application of cooperative relays for secondary transmissions with the primary quality of service (QoS) constraint was considered in [14]. In [15,16], the primary and secondary systems' outage performances and system capacities were studied with the same system model, respectively. Under the condition of keeping the normal transmissions of primary users, the performance of secondary system was ameliorated in [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Balancing outage performance of primary user and secondary user by relay-assisted primary transmission

Zhao

Sun

Chen

et al. 2014

EURASIP J. Adv. Signal Process.

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In this paper, a cooperative transmission protocol for cognitive radio systems is proposed. In this protocol, the primary system comprises a transmitter (PT), a receiver (PR), and a decode-and-forward relay (Relay), while the secondary system comprises a transmitter (ST) and a receiver (SR). Both the ST and the Relay assist the transmissions of the primary users together. The outage probabilities of the primary system and the secondary system are analyzed and verified through simulations. In order to decrease outage probability of the secondary system, power allocation is performed at the ST. However, it will lead to deterioration of outage performance of the primary system. In order to guarantee outage performance of the primary system, a Relay is employed. Compared with two existing protocols, one without cooperation and the other with cooperation of the secondary system only, the proposed protocol is able to better balance outage performances of the primary system and the secondary system.

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Capacity Analysis of Cognitive Relay Networks with the PU's Interference

Cited by 51 publications

References 13 publications

On the performance of cognitive full-duplex relaying under spectrum sharing constraints

On the performance of cognitive full-duplex relaying under spectrum sharing constraints

Outage performance of relay-assisted primary and secondary transmissions in cognitive relay networks

Balancing outage performance of primary user and secondary user by relay-assisted primary transmission

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