Outage Performance for Cognitive Relay Networks with Underlay Spectrum Sharing

Luo, Le; Zhang, Ping; Zhang, Guangchi; Qin, Jiayin

doi:10.1109/lcomm.2011.051011.110426

Cited by 178 publications

(121 citation statements)

References 9 publications

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“…Recently, we have investigated the outage probability (OP) for spectrum sharing networks with amplify-and-forward (AF) relaying [4]. It has been shown in [1][2][3][4] that utilising DF/AF relaying significantly enhances system performance in such constrained transmission power conditions. However, most of the previous works have neglected the effect of the primary transmitter (PU-Tx), which significantly deteriorates the performance of the secondary network.…”

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confidence: 99%

Effect of primary network on performance of spectrum sharing AF relaying

et al. 2012

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Most of the research in spectrum sharing has neglected the effect of interference from primary users. In this reported work, the performance of spectrum sharing amplify-and-forward relay networks under interference-limited environment, where the interference induced by the transmission of primary networks is taken into account, is investigated. In particular, a closed-form expression tight lower bound of outage probability is derived. To reveal additional insights into the effect of primary networks on the diversity and array gains, an asymptotic expression is also obtained.Introduction: Spectrum sharing relay networks have recently attracted much attention for providing higher reliability over direct transmission under scarce and limited spectrum conditions [1 -4]. Specifically, the performance of decode-and-forward (DF) relay networks in spectrum sharing environments has been reported [1 -3]. Recently, we have investigated the outage probability (OP) for spectrum sharing networks with amplify-and-forward (AF) relaying [4]. It has been shown in [1][2][3][4] that utilising DF/AF relaying significantly enhances system performance in such constrained transmission power conditions. However, most of the previous works have neglected the effect of the primary transmitter (PU-Tx), which significantly deteriorates the performance of the secondary network. In this Letter, to evaluate this interference effect, we derive a closed-form expression for OP and further calculate an asymptotic expression. We show that under fixed interference from primary networks, the diversity order remains unchanged and the loss only occurs in the array gain, which is theoretically quantified. However, when the interference is linearly proportional to the signal-to-noise ratio (SNR) of the secondary network, the system is severely affected, leading to an irreducible error floor of OP.

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Effect of primary network on performance of spectrum sharing AF relaying

et al. 2012

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“…For benchmarking purposes, these results will also be compared to the lower bound given in [4] and reported in its general expression in (14). In the case of a symmetric secondary system geometry, it is quiet remarkable from Fig.…”

Section: B Simulation Resultsmentioning

confidence: 99%

“…It is worth noting here that, unlike the outage analysis carried out in [4] where a lower bound on the outage probability is derived under the assumptions of symmetric secondary network geometry and small number K, the derived closed form of the end-to-end outage probability is valid for any value K and channel statistics λ ss , λ sr , λ sr and λ pp . Most importantly, it provides useful insights into the impact of the proposed selective relaying scheme on the secondary system transmission reliability.…”

Section: Outage Probability Analysismentioning

confidence: 99%

“…Most importantly, it provides useful insights into the impact of the proposed selective relaying scheme on the secondary system transmission reliability. For comparison purposes, the lower bound in [4] is reported in (14) in its general expression.…”

Section: Outage Probability Analysismentioning

confidence: 99%

“…In [3], the authors considered a relay selection based on the max-min criterion in the absence of the direct secondary link, and accordingly the outage probability was derived. However, the direct secondary link was considered in [4], but only a tight lower bound on the outage probability was investigated. In [10], the authors focused on a cognitive relay network under PU's outage constraint, where the SU's transmission should not affect the PU's transmission and maintain the outage probability at the primary receiver under a predetermined value.…”

Section: Introductionmentioning

confidence: 99%

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Exact Outage Probability Analysis for Relay-Aided Underlay Cognitive Communications

El-Moutaouakkil

Tourki

Qaraqe

et al. 2012

2012 IEEE Vehicular Technology Conference (VTC Fall)

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Abstract-In a spectrum sharing underlay context, we investigate the exact derivation of the outage probability for relay-aided cognitive radio communications. To give more degrees of freedom to the secondary system in acquiring a targeted quality-of-service (QoS) under the primary system interference constraint, the secondary link is assisted by a set of relays acting in a two-hop decode-and-forward selective relaying mode. By means of the cumulative distribution functions of the received signal-to-noise ratio (SNR) at the secondary receiver, we derive the end-to-end outage probability of the secondary system in its closed form. The analytical and simulation results are then compared and interestingly shown to perfectly match over the entire interference threshold region.

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Performance of cognitive relay network with novel hybrid spectrum access schemes with imperfect CSI

Prasad

Bhowmick

Roy

et al. 2016

Int J Communication

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Two novel spectrum access schemes, a hybrid spectrum access scheme (HSAS) and a modified HSAS combining underlay mode and overlay mode, are proposed for a relay based cognitive radio (CR) network. The CR employs the underlay mode with imperfect channel state information of the interfering link between CR transmitter and primary user receiver if primary user is sensed to be present else it employs overlay mode. In both the schemes, transmission of CR is assisted by relay working in amplify and forward scheme by maintaining interference below an interference threshold in underlay mode and a collision constraint in overlay mode. In HSAS, CR transmits either in underlay mode or in overlay mode only during the transmission slot of a detection cycle, whereas in modified HSAS, the CR transmits for the entire frame including the sensing time. The outage probability of CR user is considered as the performance metric. Novel expressions of outage probability for both the schemes have been developed. Impact of several sensing parameters such as sensing time, correlation coefficient, and tolerable interference threshold has been investigated. Copyright

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Outage Performance for Cognitive Relay Networks with Underlay Spectrum Sharing

Cited by 178 publications

References 9 publications

Effect of primary network on performance of spectrum sharing AF relaying

Effect of primary network on performance of spectrum sharing AF relaying

Exact Outage Probability Analysis for Relay-Aided Underlay Cognitive Communications

Performance of cognitive relay network with novel hybrid spectrum access schemes with imperfect CSI

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