Optimal beamforming for two-way multi-antenna relay channel with analogue network coding

Zhang, Rui; Liang, Ying-Chang; Chai, Chin Choy; Cui, Shuguang

doi:10.1109/jsac.2009.090611

Cited by 536 publications

(445 citation statements)

References 28 publications

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“…An overview of various PNC and denoise and forward techniques can be found in [6] and [5] respectively. In [13], the authors study the two way relaying based on PNC. They study an optimal beamforming design to increase the achievable capacity.…”

Section: Previous Work and Our Contributionmentioning

confidence: 99%

Dynamic Spectrum Leasing for Bi-Directional Communication: Impact of Selfishness

Hafeez

Elmirghani

2016

IEEE Trans. Commun.

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Abstract-In this paper, we propose a beamforming based dynamic spectrum leasing (DSL) technique to improve the spectral utility of bi-directional communication of the legacy/primary spectrum users through the help of co-located secondary users. The secondary users help for a time interval to relay the data between two primary terminals using physical layer network coding and beamforming to attain bi-directional communication with high spectral utility. As a reimbursement, the secondary users, cognitive radios (CRs) in our case, get exclusive access to the primary spectrum for a certain duration. We use Nash Bargaining to determine the optimal division of temporal resources between relaying and reimbursement. Moreover, we consider that a fraction of secondary nodes can act selfishly by not helping the primary yet enjoy the reimbursement time. We measure the utility of the DSL scheme in terms of a metric called timebandwidth product (TBP) ratio quantifying the number of bits transmitted in direct communication vs. DSL. We show that if all secondary nodes act honestly, more than 17 folds increase in the TBP ratio is observed for a sparse CR network (CRN). However, in such a network, selfish behavior of CR nodes can reduce the gain by more than a factor of 2.

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Section: Previous Work and Our Contributionmentioning

confidence: 99%

Dynamic Spectrum Leasing for Bi-Directional Communication: Impact of Selfishness

Hafeez

Elmirghani

2016

IEEE Trans. Commun.

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“…Analog network coding [9] extends the AF-based one-way relaying scheme to a two-way relay channel to support communications in two directions via a two-step protocol. The problem of finding the optimal rate region of a two-way relay channel with a two-step AF protocol has been studied for different network setups [10]- [12]. The authors in [10] characterized the maximum achievable rate region for the twoway relay channel with a single multi-antenna relay, while the maximum rate region for the AF two-way relay channel with multiple single-antenna relays has been studied in [11] and [12] under both sum and individual relay power constraints.…”

Section: Introductionmentioning

confidence: 99%

Optimal Amplify-and-Forward Scheme for Parallel Relay Networks with Correlated Relay Noise

Liu

Yang

2014

ETRI J

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This paper studies a parallel relay network where the relays employ an amplify-and-forward (AF) relaying scheme and are subjected to individual power constraints. We consider correlated effective relay noise arising from practical scenarios when the relays are exposed to common interferers. Assuming that the noise covariance and the full channel state information are available, we investigate the problem of finding the optimal AF scheme in terms of maximum end-to-end transmission rate. It is shown that the maximization problem can be equivalently transformed to a convex semi-definite program, which can be efficiently solved. Then an upper bound on the maximum achievable AF rate of this network is provided to further evaluate the performance of the optimal AF scheme. It is proved that the upper bound can be asymptotically achieved in two special regimes when the transmit power of the source node or the relays is sufficiently large. Finally, both theoretical and numerical results are given to show that, on average, noise correlation is beneficial to the transmission ratewhether the relays know the noise covariance matrix or not.

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“…Here, we investigate the application of NC to TWSRNs, which have interested many studies [18]- [23]. In an NC-based TWSRN, the relay node mixes the signals received from two terminal nodes before broadcasting it.…”

Section: Introductionmentioning

confidence: 99%

Network coding-based channel quality indicator reporting for two-way multi-relay networks

Vien

Nguyen

2012

Wirel. Commun. Mob. Comput.

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an open access repository of Middlesex University research http://eprints.mdx.ac.uk Vien, Quoc-Tuan; Nguyen, Huan X., 2012. Network coding based CQI reporting for two-way multi-relay networks. Available from Middlesex University's Research Repository. Copyright:Middlesex University Research Repository makes the University's research available electronically.Copyright and moral rights to this work are retained by the author and/or other copyright owners. No part of the work may be sold or exploited commercially in any format or medium without the prior written permission of the copyright holder(s). A copy may be downloaded for personal, noncommercial, research or study without prior permission and without charge. Any use of the work for private study or research must be properly acknowledged with reference to the work's full bibliographic details.This work may not be reproduced in any format or medium, or extensive quotations taken from it, or its content changed in any way, without first obtaining permission in writing from the copyright holder(s).If you believe that any material held in the repository infringes copyright law, please contact the Repository Team at Middlesex University via the following email address: eprints@mdx.ac.ukThe item will be removed from the repository while any claim is being investigated. This results in a significant improvement of system throughput especially when the number of relays is large. Upper and lower bounds of the mean square error (MSE) of the estimated CQI are derived to study performance behaviour of our proposed scheme. It is found that the MSE of the estimated CQI increases proportionally with the square of the cardinality of CQI level sets though an increased number of CQI levels would eventually lead to a higher data-rate transmission. Based on the derived bounds, a low-complexity relay selection (RS) scheme is then proposed. Simulation results show that, in comparison with optimal methods, our suboptimal bound-based RS scheme achieves satisfactory performance while reducing the complexity at least three times in case of large number of relays.Quoc-Tuan Vien is with School of Engineering and Built Environment,

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Optimal beamforming for two-way multi-antenna relay channel with analogue network coding

Cited by 536 publications

References 28 publications

Dynamic Spectrum Leasing for Bi-Directional Communication: Impact of Selfishness

Dynamic Spectrum Leasing for Bi-Directional Communication: Impact of Selfishness

Optimal Amplify-and-Forward Scheme for Parallel Relay Networks with Correlated Relay Noise

Network coding-based channel quality indicator reporting for two-way multi-relay networks

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