Energy-Aware Power Allocation in Cooperative Communication Systems with Imperfect CSI

Devarajan, Rajiv; Punchihewa, A.; Bhargava, V.K.

doi:10.1109/tcomm.2013.021513.100278

Cited by 14 publications

(5 citation statements)

References 14 publications

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“…where e 1 and e 2 are the MMSE estimation errors and follow zero mean complex Gaussian distribution with variance σ 2 e 1 and σ 2 e 2 , respectively, and the estimation errors are independent with the channel estimation results [11].…”

Section: System Modelmentioning

confidence: 99%

“…Under the consideration of channel uncertainty, the relay selection and power allocation schemes are proposed to minimize the uplink transmit power of the network by taking each user's target data rate as the quality of service (QoS) constraint in [10]. Another recent work about RRA for OFDMA relay networks with imperfect CSI was introduced in [11], where only power allocation algorithm was introduced. In [12], resource allocation scheme was presented for the selected relays.…”

Section: Introductionmentioning

confidence: 99%

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Energy-efficient resource allocation for OFDMA two-way relay networks with imperfect CSI

Chang

Zhang

Guo

et al. 2015

J Wireless Com Network

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Most of the existed works on the radio resource allocation (RRA) problem commonly assume the channel-state information (CSI) can be perfectly obtained by the transmission source. However, such assumption is not practical in the realistic wireless systems. In this work, we consider the practical implementation issues of resource allocation in orthogonal frequency division multiple access (OFDMA) two-way relay networks: the inaccuracy of channel-state information (CSI) available to the source. Instead, only the estimated channel status is known by the source. In this context, a joint optimization of subcarrier pairing and allocation, relay selection, and transmit power allocation is formulated in OFDMA two-way amplify-and-forward relay networks. Moreover, the objective of this work is to minimize the energy consumption of the overall system. Further, to ensure the quality of service (QoS) or data rate requirement, the energy consumption must be minimized without compromising the QoS. Therefore, by applying convex optimization techniques, energy-efficient algorithms are developed with the objective to minimize the total transmit power with guaranteeing the required data rates. Through simulation studies, energy consumption performance of the systems under the proposed schemes is investigated. It can be observed that our proposed scheme can improve the energy consumption performance of the considered system.

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Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy-efficient resource allocation for OFDMA two-way relay networks with imperfect CSI

Chang

Zhang

Guo

et al. 2015

J Wireless Com Network

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“…Different power allocation problems in cooperative transmission subject to imperfect CSI were recently investigated in [4]. The obtained channel estimates are used to derive closed-form solutions for a basic three-node configuration of a source node, a relay and a destination node.…”

Section: Introductionmentioning

confidence: 99%

Energy-efficient cooperative transmission in wireless networks with limited channel state information

Habibi

Ghrayeb

Aghdam

2015

2015 54th IEEE Conference on Decision and Control (CDC)

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This paper tackles the problem of minimumenergy cooperative transmission in wireless networks under the assumption of limited channel state information at the transmitters. It is assumed that only the average statistics of the fading channels are known to the transmitters. The objective here is to jointly optimize the set of relays and the transmission powers for both the broadcasting and cooperative transmission phases while satisfying probabilistic signal-to-noise ratio (SNR) constraints at the relays and at the destination node. Increasing the broadcasting power expands the set of potential relays and decreases the required power for cooperative transmission. Hence, there is a trade-off in the selection of the power values, which is addressed in this work by using a chanceconstrained optimization framework. Simulations are presented to demonstrate the efficacy of the proposed approach.

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“…Energy efficient communications has received significant attention recently [1]- [5]. The problem of energy-efficient design was investigated from physical layer standpoint [2], medium-access-control (MAC) layer standpoint [3], and crosslayer standpoint [4].…”

Section: Introductionmentioning

confidence: 99%

“…Recall that the receiving nodes have the CSI 5. This probability, P F p,s , can be upper bounded by the probability of having M antennas each of which is independently decodes the primary packet.…”

mentioning

confidence: 99%

Maximum throughput of a secondary user cooperating with an energy-aware primary user

Shafie

Sultan

Khattab

2014

2014 12th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt)

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This paper proposes a cooperation protocol between a secondary user (SU) and a primary user (PU) which dedicates a free frequency subband for the SU if cooperation results in energy saving. Time is slotted and users are equipped with buffers. Under the proposed protocol, the PU releases portion of its bandwidth for secondary transmission. Moreover, it assigns a portion of the time slot duration for the SU to relay primary packets and achieve a higher successful packet reception probability at the primary receiver. We assume that the PU has three states: idle, forward, and retransmission states. At each of these states, the SU accesses the channel with adaptive transmission parameters. The PU cooperates with the SU if and only if the achievable average number of transmitted primary packets per joule is higher than the number of transmitted packets per joule when it operates alone. The numerical results show the beneficial gains of the proposed cooperative cognitive protocol.

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Energy-Aware Power Allocation in Cooperative Communication Systems with Imperfect CSI

Cited by 14 publications

References 14 publications

Energy-efficient resource allocation for OFDMA two-way relay networks with imperfect CSI

Energy-efficient resource allocation for OFDMA two-way relay networks with imperfect CSI

Energy-efficient cooperative transmission in wireless networks with limited channel state information

Maximum throughput of a secondary user cooperating with an energy-aware primary user

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