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

Abstract

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,

Optimization of Relay Placement in Wireless Butterfly Networks

“…Related works on the application of NC in TWSRNs can be found in Popovski [76], and automatic repeat request (ARQ) with PNC in Vien et al in 2010 and 2011 [77,78], channel quality indicator (CQI) reporting with PNC in AF-based TWSRNs in Vien et al in 2012 and 2014 [79,80].…”

Performance analysis of switch‐and‐stay combining in two‐way relay systems with analog network coding and time‐division broadcast protocols

“…(50) By swapping˛i withˇi in (48), we can obtain the asymptotic individual BER at source B. Then the asymptotic expression for the average of individual BERs is given by P asy e,ave D When T D 0, one can find that 1 .T/ D 1 .T/ D 0, whereas 2 .T/ D q 5 2 2 and 2 .T/ D 12 2 . On the other hand, when T is large, one can verify from L'Hospital rule that both 2 .T/ and 2 .T/ converge to zero while 1 .T/ and 1 .T/ approach to 9T 15 2 3 .…”

“…It has been recognized that AF relay is more practical by introducing little delay and low deployment cost. Recently, two-way relay systems have received great attention because two traffic flows can be supported by the same physical channels concurrently, providing much higher spectral efficiency than one-way relaying [4][5][6][7][8][9][10][11][12][13][14][15]. There are two major AF-based protocols proposed for two-way relay systems, that is, analog network coding (ANC) [8][9][10][11][12][13] and time-division broadcast (TDBC) [14,15].…”

Novel Calibration of MIESM and Reduction of CQI Feedback for Improved Fast Link Adaptation

“…All the existing calibration methods of MIESM were performed using only limited channel environments without consideration of various channel conditions of mobile communications. This is not an optimal method considering FLA in actual situations.Accurate CQI estimation of the FLA enables reliable communication with high throughput between the user and the BS [15][16][17]. The CQI reporting method of the user includes periodic reporting of CQI feedback at regular intervals and aperiodic reporting, which feeds back the CQI according to the request of the BS.…”

“…Accurate CQI estimation of the FLA enables reliable communication with high throughput between the user and the BS [15][16][17]. The CQI reporting method of the user includes periodic reporting of CQI feedback at regular intervals and aperiodic reporting, which feeds back the CQI according to the request of the BS.…”