Capacity and power allocation for spectrum-sharing communications in fading channels

Musavian, Leila; Aı̈ssa, Sonia

doi:10.1109/t-wc.2009.070265

Cited by 288 publications

(225 citation statements)

References 19 publications

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“…In general, the tolerable interference power at PUs can be defined by means of average interference power, peak interference power, or both [10], [11]. The average interference power constraint has low feedback overhead and it applies to non-real time applications where the quality-ofservice (QoS) depends upon the average output SNR.…”

Section: A Criteria For Optimal Power Allocationmentioning

confidence: 99%

“…Moreover, the transmit power of a SU is physically limited by its own maximum output power, which is essentially equivalent to the peak interference power constraint. Nevertheless, it was previously demonstrated that peak interference-power constraint will not affect system performance when it is large enough [11], [12]. Therefore, we consider only the average interference power constraint in the optimization problem above.…”

Section: A Criteria For Optimal Power Allocationmentioning

confidence: 99%

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Cooperative AF Relaying in Spectrum-Sharing Systems: Outage Probability Analysis under Co-Channel Interferences and Relay Selection

Xia

Aı̈ssa

2012

IEEE Trans. Commun.

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Abstract-For cooperative amplify-and-forward (AF) relaying in spectrum-sharing wireless systems, secondary users share spectrum resources originally licensed to primary users to communicate with each other and, thus, the transmit power of secondary transmitters is strictly limited by the tolerable interference powers at primary receivers. Furthermore, the received signals at a relay and at a secondary receiver are inevitably interfered by the signals from primary transmitters. These co-channel interferences (CCIs) from concurrent primary transmission can significantly degrade the performance of secondary transmission. This paper studies the effect of CCIs on outage probability of the secondary link in a spectrum-sharing environment. In particular, in order to compensate the performance loss due to CCIs, the transmit powers of a secondary transmitter and its relaying node are respectively optimized with respect to both the tolerable interference powers at the primary receivers and the CCIs from the primary transmitters. Moreover, when multiple relays are available, the technique of opportunistic relay selection is exploited to further improve system performance with low implementation complexity. By analyzing lower and upper bounds on the outage probability of the secondary system, this study reveals that it is the tolerable interference powers at primary receivers that dominate the system performance, rather than the CCIs from primary transmitters. System designers will benefit from this result in planning and designing next-generation broadband spectrum-sharing systems.Index Terms-Amplify-and-forward (AF) relaying, co-channel interference (CCI), interference power constraints, outage probability, relay selection, spectrum sharing.

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Section: A Criteria For Optimal Power Allocationmentioning

confidence: 99%

Section: A Criteria For Optimal Power Allocationmentioning

confidence: 99%

Cooperative AF Relaying in Spectrum-Sharing Systems: Outage Probability Analysis under Co-Channel Interferences and Relay Selection

Xia

Aı̈ssa

2012

IEEE Trans. Commun.

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“…In some research related to resource allocation with SS, it has been shown that transmit power control can improve the efficiency of spectrum utilization and protect PUs [14][15][16][17][18][19][20][21][22][23][24]. In fact, proper transmit power control can protect PUs without spectrum sensing and increase opportunities of SS by SUs [20].…”

Section: Introductionmentioning

confidence: 99%

Analysis of transmit power setting technique for cognitive radio networks

Umebayashi

Lehtomäki

Suliman

2016

J Wireless Com Network

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We investigate a method to set the maximum allowable transmit power for a secondary base station in dynamic spectrum sharing among secondary users and primary users. In conventional methods, location information is assumed. Thus, the maximum allowable transmit power can be set by considering the shadowing between the secondary base station and the primary user receivers to satisfy a constraint. Specifically, the probability that the interference from secondary base station exceeds the acceptable level must be less than the constraint target probability. We assume that the location information is not available at the secondary network. Instead, the secondary base station uses the received signal strength from the primary user transmitter for distance estimation. In this case, we have to consider shadowing not only between the secondary base station and the primary user receivers, but also between the primary user transmitter and the secondary receiver(s). We also need to account for the uncertainty of the distance. In order to satisfy the constraint target probability, we proposed a two-step approach to setting the maximum allowable transmit power where a transmission decision margin and a transmit power margin are utilized. To reduce these margins, we also propose cooperative maximum allowable transmit power setting method utilizing also received signal strength values from several secondary users. Simulation results confirm the validity of the analysis and show the effectiveness of the proposed cooperative maximum allowable transmit power setting method, i.e., the capacity based on cooperative maximum allowable transmit power setting method is significantly better than that of non-cooperative maximum allowable transmit power setting method. In addition, we show a proper size of radius of additional separation area to protect primary users by the numerical results.

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“…In [55], the authors derive the optimal power allocation for the ergodic capacity, outage capacity, and minimum-rate capacity of an SU under both the PIP and AIP constraints from a PU. The ergodic capacity, delay-limited capacity, and outage capacity of an SU is studied in [56] under different combinations of the peak transmit power (PTP) constraint or average transmit power (ATP) constraint at the SU and the PIP constraint or AIP constraint from a PU.…”

Section: Introductionmentioning

confidence: 99%

Joint bandwidth and power allocation in wireless multi-user decode-and-forward relay networks

Gong

Vorobyov

Tellambura

2010

2010 IEEE International Conference on Acoustics, Speech and Signal Processing

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Capacity and power allocation for spectrum-sharing communications in fading channels

Cited by 288 publications

References 19 publications

Cooperative AF Relaying in Spectrum-Sharing Systems: Outage Probability Analysis under Co-Channel Interferences and Relay Selection

Cooperative AF Relaying in Spectrum-Sharing Systems: Outage Probability Analysis under Co-Channel Interferences and Relay Selection

Analysis of transmit power setting technique for cognitive radio networks

Joint bandwidth and power allocation in wireless multi-user decode-and-forward relay networks

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