Outage Performance of Cognitive-Radio Relay System Based on the Spectrum-Sharing Environment

Guo, Yanyan; Kang, Guixia; Sun, Qibo; Zhang, Meikui; Zhang, Ping

doi:10.1109/glocom.2010.5683595

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…For that reason, the SS's power P is constrained as P ≤ min Q |hs,p| 2 , P s where P s is the maximum transmission power of SS [8]. So the received SNR γ s,ri at the i th relay is given as…”

Section: B Mathematical Modelmentioning

confidence: 99%

“…The performance of this scheme has been investigated intensively in conventional systems [6] and we adopt it in this paper as well. Recently, there have been a few articles on relaying schemes in CRNs [7]- [8]. The End-to-End performance of cooperative relaying in spectrum-sharing systems with quality of service requirements is studied in [7] where the authors investigate the bit error rate (BER) and outage probability for a DF relaying system.…”

Section: Introductionmentioning

confidence: 99%

“…All these works considered only a single relay. The authors in [8] investigate the outage probability for a multi-relay system with best relay selection based on spectrum sharing constraints. All the previous works considered either the received peak or average power interference constraints or both to limit the interference to PUs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cooperative relaying in spectrum-sharing systems with beamforming and interference constraints

Afana

Asghari

Ghrayeb

et al. 2012

2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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In this paper, we use a distributed Zero Forcing Beamforming (ZFB) method in cognitive radio relay networks in an effort to enhance the spectrum efficiency and improve the performance of the cognitive (secondary) system. In particular, we consider a spectrum sharing system where a set of decodeand-forward (DF) relays are employed to help a pair of secondary users in the presence of a licensed (primary) user. In this context, we derive expressions for the probability density functions (PDFs) of the received signal-to-noise ratio (SNR) at the relays as well as at the secondary destination. We also derive closed form expressions for the outage and bit error rate (BER) probabilities over independent and identically distributed (i.i.d.) Rayleigh fading channels. Numerical results demonstrate the efficacy of beamforming in improving the outage and BER performance.

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Section: B Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cooperative relaying in spectrum-sharing systems with beamforming and interference constraints

Afana

Asghari

Ghrayeb

et al. 2012

2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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“…In [11], under PU's outage constraint, the outage performance of CRN is derived. [12]- [13] address the outage performance of CRN in underlay spectrum sharing environment over Rayleigh fading channel, and derive the outage probability of secondary system. [14] extend the results in [12], by considering the dependence among the received SNRs, the authors derive a tight lower bound on the outage probability, while [12] and [13] both give the upper bounds on the outage probability.…”

Section: Introductionmentioning

confidence: 99%

Outage Performance of Cognitive Relay Networks with Primary User's ISR Constraint

Wei

Xie

et al. 2012

2012 IEEE Vehicular Technology Conference (VTC Fall)

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In the underlay spectrum sharing systems, secondary users (SUs) are allowed to transmit their data in the licensed spectrum band when primary users(PUs) are also transmitting, as long as the transmission of SUs do not interfere PUs' communications. In cognitive relay networks, the source and relay nodes both need to tune their transmit power to mitigate the interference to PU. In this paper, we investigate the outage performance of cognitive relay networks with PU's interference to signal ratio (ISR) constraint, where both average and peak ISR constraint are considered. Finally, We derive the exact outage probability in the scenario without cooperation and the upper bound of outage probability in the scenario with cooperation.

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“…In this context, cognitive cooperative techniques have been considered as a powerful solution to overcome severe multipath fading and to improve the performance of the secondary system. Recently, a number of cognitive cooperative protocols have been investigated in terms of outage probability, ergodic capacity, and bit error probability for spectrum sharing systems . In particular, a cognitive cooperative transmission protocol has been proposed in .…”

Section: Introductionmentioning

confidence: 99%

Cognitive cooperative networks with decode‐and‐forward relay selection under interference constraints of multiple primary users

Tran

Zepernick

Phan

2013

Wireless Communications

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In this paper, we study the performance of cognitive cooperative radio networks under the peak interference power constraints of multiple primary users (PUs). In particular, we consider a system model where the secondary user communication is assisted by multiple secondary relays (SRs) that operate in the decode‐and‐forward mode to relay the signal from a secondary transmitter to a secondary receiver. Moreover, we assume that the transmit powers of the secondary transmitter and the SRs are subject to the peak interference power constraints of multiple PUs that operate in their coverage range. Given this system setting, we first derive the cumulative distribution function of the instantaneous end‐to‐end signal‐to‐noise ratio. Then, we obtain a closed‐form expression for the outage probability and an exact expression for the symbol error probability of the considered network. These tractable formulas enable us to examine the impact of the presence of multiple PUs on the performance of the considered spectrum sharing system. Furthermore, our numerical results show that system performance is improved significantly when the number of SRs increases or the channel mean power from the secondary user to the PUs is low. Also, any increase in the number of PUs in the coverage range of the secondary transmitter or the SRs leads to degradation in system performance. Finally, Monte Carlo simulations are provided to verify the correctness of our analytical results. Copyright © 2013 John Wiley & Sons, Ltd.

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Outage Performance of Cognitive-Radio Relay System Based on the Spectrum-Sharing Environment

Cited by 6 publications

References 12 publications

Cooperative relaying in spectrum-sharing systems with beamforming and interference constraints

Cooperative relaying in spectrum-sharing systems with beamforming and interference constraints

Outage Performance of Cognitive Relay Networks with Primary User's ISR Constraint

Cognitive cooperative networks with decode‐and‐forward relay selection under interference constraints of multiple primary users

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