Energy-Efficient Power Allocation for Fixed-Gain Amplify-and-Forward Relay Networks with Partial Channel State Information

Zafar, Ammar; Radaydeh, Redha M.; Chen, Y.; Alouini, Mohamed‐Slim

doi:10.1109/wcl.2012.080112.120318

Cited by 23 publications

(15 citation statements)

References 5 publications

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“…The performance of the single antenna case then becomes comparable to that of the multiple antenna case. (1) r S (1) 1r profile of the SER of TAS case was found to be almost the same for both of the fading cases. However, in the case of all of the antennas being utilized, the SER was found to be better for the Nakagami-m case.…”

Section: Resultsmentioning

confidence: 68%

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Selection of the Best Two-Hop AF Wireless Link under Multiple Antenna Schemes over a Fading Channel

2015

J Inf Process Syst

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In evaluating the performance of a dual-hop wireless link, the effects of large and small scale fading has to be considered. To overcome this fading effect, several schemes, such as multiple-input multiple-output (MIMO) with orthogonal space time block codes (OSTBC), different combining schemes at the relay and receiving end, and orthogonal frequency division multiplexing (OFDM) are used in both the transmitting and the relay links. In this paper, we first make compare the performance of a two-hop wireless link under a different combination of space diversity in the first and second hop of the amplify-and-forward (AF) case. Our second task in this paper is to incorporate the weak signal of a direct link and then by applying the channel model of two random variables (one for a direct link and another for a relayed link) we get very impressive result at a low signal-to-noise ratio (SNR) that is comparable with other models at a higher SNR. Our third task is to bring other three schemes under a two-hop wireless link: use of transmit antenna selection (TAS) on both link with weak direct link, distributed Alamouti scheme in two-hop link and single relay antenna with OFDM subcarrier. Finally, all of the schemes mentioned above are compared to select the best possible model. The main finding of the paper is as follows: the use of MIMO on both hops but application TAS on both links with weak direct link and the full rate OFDM with the sub-carrier for an individual link provide a better result as compared to other models.

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Section: Resultsmentioning

confidence: 68%

“…However, sometimes a relay station taking feedback/acknowledgement from the receiver to adjust the gain is called the variable gain AF relay. The concepts of an AF relay are summarized in [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Selection of the Best Two-Hop AF Wireless Link under Multiple Antenna Schemes over a Fading Channel

2015

J Inf Process Syst

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“…Because the power consumption model is prohibitively hard to attain when the computational complexity is particularly addressed for the power consumption. Hence, without loss of the generality, the transmit power is emphasized as the objective function for designing the relay precoder, which is similarly applied in other energy-efficient communications such as [26].…”

Section: A Derivation Of Sinrs and Formulation Of The Optimization Pmentioning

confidence: 99%

Overhearing Protocol Design Exploiting Intercell Interference in Cooperative Green Networks

Zhang

Liu

et al. 2016

IEEE Trans. Veh. Technol.

107

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The conventional two-way relaying (TWR) protocol requires that the transmitter (receiver) in one direction must be the receiver (transmitter) in the other direction, an limitation precluding the application of the TWR for sophisticated realworld wireless networks. In this paper, we study a more general multi-cell system consisting of a downlink (DL) traffic in one cell and an uplink (UL) traffic in an adjacent cell, with a multi-antenna relay located in the cell-edge and shared by both cells. For the coexistence of DL and UL transmissions, we propose to exploit the overheard signals from the adjacent cell (commonly known as the inter-cell interference) to improve the quality of signal reception in both cells. To reduce the power consumption to suit for green networks, we design the optimum relay precoder to minimize the total power at the relay, yet satisfying the rate constraints for both the DL and UL traffics. The original precoder design is a non-convex problem which is difficult to solve. To make the problem tractable, we transform the non-convex problem to an equivalent quadratically constrained quadratic program, which is then solved by the semidefinite relaxation technique. Finally, simulations validate the effectiveness of our proposed protocol together with the optimized relay precoder.Index Terms-Overhearing protocol design, dual-hop channel, multi-cell, minimum mean squared error (MMSE).

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“…Under both assumptions on the CSI, [21] maximized the end-to-end SNR by optimally allocating power to the relays for Rayleigh fading channels. We studied energy-efficient power allocation for an AP fixedgain AF relay network requiring only the knowledge of the instantaneous channel responses of the second hop and channel statistics of the first hop, and requiring only the knowledge of the channel statistics of all the links in [2] and [22], respectively. In both works, we considered the problems of maximizing the end-to-end SNR under individual and overall power constraints and minimizing the total power consumed while ensuring that the end-to-end SNR remains above a certain threshold value.…”

Section: Introductionmentioning

confidence: 99%

“…• This work differs from [2] and [22] by considering variable-gain AF relays instead of fixed-gain AF relays.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Efficiency of Constrained Dual-Hop Variable-Gain AF Relaying Under Nakagami-<formula formulatype="inline"> <tex Notation="TeX">$m$</tex></formula> Fading

Zafar

Radaydeh

Chen

et al. 2014

IEEE Trans. Signal Process.

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Energy-Efficient Power Allocation for Fixed-Gain Amplify-and-Forward Relay Networks with Partial Channel State Information

Cited by 23 publications

References 5 publications

Selection of the Best Two-Hop AF Wireless Link under Multiple Antenna Schemes over a Fading Channel

Selection of the Best Two-Hop AF Wireless Link under Multiple Antenna Schemes over a Fading Channel

Overhearing Protocol Design Exploiting Intercell Interference in Cooperative Green Networks

Enhancing the Efficiency of Constrained Dual-Hop Variable-Gain AF Relaying Under Nakagami-<formula formulatype="inline"> <tex Notation="TeX">$m$</tex></formula> Fading

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