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Author Mi Hu ♦ Jianhua Ge ♦ Xiaoye Shi
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2013
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Channel estimation ♦ Relays ♦ Resource management ♦ Interference ♦ Cognitive radio ♦ Network coding ♦ Noise
Abstract In practice, imperfect channel-state information (CSI) is one of the main causes of performance degradation in wireless networks. In this paper, we investigated the impact of channel estimation error on the outage probability from the perspective of the secondary communication in cognitive radio (CR). It is found that an error floor appears in the outage probability with imperfect channel knowledge due to the channel estimation error. Further, to mitigate the negative impact of imperfect CSI, a power allocation strategy is proposed by minimizing the weaker link's individual outage probability under the sum-power constraints. Particularly, the algorithm of proposed scheme only used statistical CSI rather than instantaneous CSI, which can facilitate practical implementation. Simulation results presented that the proposed power allocation scheme provides significant performance gain over the traditional scheme in terms of outage performance and is robust to the channel uncertain. Moreover, the best location for the relay is near by the middle point of the two end nodes irrespective of the power allocation.
Description Author affiliation: State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an, China (Mi Hu; Jianhua Ge; Xiaoye Shi)
ISBN 9781479928255
ISSN 21593450
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2013-10-22
Publisher Place China
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
e-ISBN 9781479928279
Size (in Bytes) 0.98 MB
Page Count 4
Starting Page 1
Ending Page 4

Source: IEEE Xplore Digital Library