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

Gong, Xiaowen; Vorobyov, Sergiy A.; Tellambura, Chintha

doi:10.1109/icassp.2010.5494899

Cited by 8 publications

(4 citation statements)

References 31 publications

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“…Since h i , γ i , h j , and γ j are independent constants given in the problem ( 19), (22) can not be satisfied. Let p * k > 0 and p * i = 0, ∀i, i = k. Then it follows from ( 20) and ( 21) that the following must hold…”

Section: Lemma 3: Pmentioning

confidence: 99%

Optimal Bandwidth and Power Allocation for Sum Ergodic Capacity Under Fading Channels in Cognitive Radio Networks

Gong

Vorobyov

Tellambura

2011

IEEE Trans. Signal Process.

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104

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This paper studies optimal bandwidth and power allocation in a cognitive radio network where multiple secondary users (SUs) share the licensed spectrum of a primary user (PU) under fading channels using the frequency division multiple access scheme. The sum ergodic capacity of all the SUs is taken as the performance metric of the network. Besides all combinations of the peak/average transmit power constraints at the SUs and the peak/average interference power constraint imposed by the PU, total bandwidth constraint of the licensed spectrum is also taken into account. Optimal bandwidth allocation is derived in closed-form for any given power allocation. The structures of optimal power allocations are also derived under all possible combinations of the aforementioned power constraints. These structures indicate the possible numbers of users that transmit at nonzero power but below their corresponding peak powers, and show that other users do not transmit or transmit at their corresponding peak power.Based on these structures, efficient algorithms are developed for finding the optimal power allocations. Index TermsBandwidth and power allocation, cognitive radio, fading channels, frequency division multiple access, sum ergodic capacity

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Section: Lemma 3: Pmentioning

confidence: 99%

Optimal Bandwidth and Power Allocation for Sum Ergodic Capacity Under Fading Channels in Cognitive Radio Networks

Gong

Vorobyov

Tellambura

2011

IEEE Trans. Signal Process.

Self Cite

104

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“…An asymptotic bound for adaptive cooperative coding (ACC) protocol based on suboptimal power allocation under different channel propagation conditions were studied [23]. The optimal joint bandwidth and power allocation schemes were derived to maximize the sum capacity of all the users, maximize the capacity of the worst user and to minimize the total power consumption of all the users by using convex optimization techniques [24]. AF MIMO relay system using greedy minimum mean square error (MMSE) antenna selection algorithm was discussed in [26].…”

Section: Introductionmentioning

confidence: 99%

Efficient relay selection scheme using regenerative and degenerative protocols for 5th generation WiMAX systems

Mangayarkarasi¹,

Jayashri²

2015

AEU - International Journal of Electronics and Communications

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“…As a viable alternative, relays (e.g., wireless access points) have been proposed to extend the coverage of a base station which has wired connection to the core network. Deploying relays in wireless communication systems is a well-studied concept [7]- [12], where different bandwidth and power allocation techniques have been evaluated for a given relay network setup/topology, using Decode-and-Forward (DF) relays [12], [13] or Amplifyand-Forward (AF) relays [14], [15] in wireless fading environment. In recently years relays using mmWave backhaul have attracted much attention [16]- [19] thanks to the high beamforming gain supported by large arrays.…”

Section: Introductionmentioning

confidence: 99%

Gbps User Rates Using mmWave Relayed Backhaul With High-Gain Antennas

Onaran

Chizhik

et al. 2017

IEEE J. Select. Areas Commun.

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Delivering Gbps high user rate over long distances (∼1 km) is challenging, and the abundant spectrum available in millimeter wave band cannot solve the challenge by its own due to the severe path loss and other limitations. Since it is economically challenging to deploy wired backhaul every few hundred meters, relays (e.g., wireless access points) have been proposed to extend the coverage of a base station which has wired connection to the core network. These relays, deployed every few hundred meters, serve the users in their vicinity and are backhauled to the base station through wireless connections. In this work, the wireless relayed backhaul design has been formulated as a topology-bandwidth-power joint optimization problem, and the influence of path loss, angular spread, array size, and RF power limitation on the user rate has been evaluated. It has been shown that for a linear network deployed along the street at 28 GHz, when high joint directional gain (50 dBi) is available, 1 Gbps user rate within cell range of 1 km can be delivered using 1.5 GHz of bandwidth (using single polarization antennas). The user rates drop precipitously when joint directional gain is reduced, or when the path loss is much more severe. When the number of RF chains is limited, the benefit of larger arrays will eventually be surpassed by the increased channel estimation penalty as the effective beamforming gain saturates owing to the channel angular spread.

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

Cited by 8 publications

References 31 publications

Optimal Bandwidth and Power Allocation for Sum Ergodic Capacity Under Fading Channels in Cognitive Radio Networks

Optimal Bandwidth and Power Allocation for Sum Ergodic Capacity Under Fading Channels in Cognitive Radio Networks

Efficient relay selection scheme using regenerative and degenerative protocols for 5th generation WiMAX systems

Gbps User Rates Using mmWave Relayed Backhaul With High-Gain Antennas

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