Exact outage probability of cognitive AF relaying with underlay spectrum sharing

Duong, Trung Q.; Bao, Vo Nguyen Quoc; Zepernick, Hans‐Jürgen

doi:10.1049/el.2011.1605

Cited by 118 publications

(114 citation statements)

References 6 publications

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“…For comparison, we also derive an asymptotic expression for the case of neglecting the effect of the PU-Tx in [4], i.e. in the absence of g I , V f 1 , and V f 2 .…”

Section: Ip |G1|mentioning

confidence: 99%

“…, after some manipulations and ignoring small terms, the asymptotic OP of the system in [4] is shown as…”

Section: Ip |G1|mentioning

confidence: 99%

“…Numerical results: Similarly as in [4], a linear network topology is assumed here where the SU-Tx, the SU-relay, and the SU-Rx are located at co-ordinates (0,0), and (1,0), respectively. The average channel power for the link between node A and B, V 0 , is inversely proportional to the distance from A to B, d 0 , i.e.…”

Section: Ip |G1|mentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

“…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%

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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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“…For comparison, we also derive an asymptotic expression for the case of neglecting the effect of the PU-Tx in [4], i.e. in the absence of g I , V f 1 , and V f 2 .…”

Section: Ip |G1|mentioning

confidence: 99%

“…, after some manipulations and ignoring small terms, the asymptotic OP of the system in [4] is shown as…”

Section: Ip |G1|mentioning

confidence: 99%

Section: Ip |G1|mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Effect of primary network on performance of spectrum sharing AF relaying

et al. 2012

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Cognitive amplify-and-forward relay networks with beamforming under primary user power constraint over Nakagami-mfading channels

Phan

Zepernick

Duong

et al. 2012

Wirel. Commun. Mob. Comput.

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In this paper, we analyze the performance of cognitive amplify-and-forward (AF) relay networks with beamforming under the peak interference power constraint of the primary user (PU). We focus on the scenario that beamforming is applied at the multi-antenna secondary transmitter and receiver. Also, the secondary relay network operates in channel state informationassisted AF mode, and the signals undergo independent Nakagami-m fading. In particular, closed-form expressions for the outage probability and symbol error rate (SER) of the considered network over Nakagami-m fading are presented. More importantly, asymptotic closed-form expressions for the outage probability and SER are derived. These tractable closedform expressions for the network performance readily enable us to evaluate and examine the impact of network parameters on the system performance. Specifically, the impact of the number of antennas, the fading severity parameters, the channel mean powers, and the peak interference power is addressed. The asymptotic analysis manifests that the peak interference power constraint imposed on the secondary relay network has no effect on the diversity gain. However, the coding gain is affected by the fading parameters of the links from the primary receiver to the secondary relay network.

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Optimal precoder design for non-regenerative multiple-input multiple-output cognitive relay systems with perfect and imperfect channel state information

Luo

Qin

2013

Wirel. Commun. Mob. Comput.

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This paper studies optimal precoder design for non-regenerative multiple-input multiple-output (MIMO) cognitive relay systems, where the secondary user (SU) and relay station (RS) share the same spectrum with the primary user (PU). We aim to maximize the system capacity subject to the transmit power constraints at the SU transmitter (SU-Tx) and RS, and the interference power constraint at the PU. We jointly optimize precoders for the SU-Tx and RS with perfect and imperfect channel state information (CSI) between the SU-Tx/RS and PU, where our design approach is based on the alternate optimization method. With perfect CSI, we derive the optimal structures of the RS and SU-Tx precoding matrices and develop the gradient projection algorithm to find numerical solution of the RS precoder. Under imperfect CSI, we derive equivalent conditions for the interference power constraints and convert the robust SU-Tx precoder optimization into the form of semi-definite programming. For the robust RS precoder optimization, we relax the interference power constraint related with the RS precoder to be convex by using an upper bound and apply the gradient projection algorithm to deal with it. Simulation results demonstrate the effectiveness of the proposed schemes.

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Exact outage probability of cognitive AF relaying with underlay spectrum sharing

Cited by 118 publications

References 6 publications

Effect of primary network on performance of spectrum sharing AF relaying

Effect of primary network on performance of spectrum sharing AF relaying

Cognitive amplify-and-forward relay networks with beamforming under primary user power constraint over Nakagami-mfading channels

Optimal precoder design for non-regenerative multiple-input multiple-output cognitive relay systems with perfect and imperfect channel state information

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