NDLI: Partial Relay Selection With Fixed-Gain Relays and Outdated CSI in Underlay Cognitive Networks

Content Provider	IEEE Xplore Digital Library
Author	Bin Zhong Zhongshan Zhang Xu Zhang Jun Wang Keping Long
Copyright Year	1967
Abstract	The impact of an imperfect channel estimation on the amplify-and-forward (AF) mode cooperative communications systems is studied, with some important factors, including the probability characteristic of the secondary user's end-to-end signal-to-noise ratio (SNR), the outage probability, the symbol error probability (SEP), and the channel capacity, being analyzed. Different from the conventional relay selection schemes, we assume that the primary users share their bandwidth with the secondary users to enable a secondary relay-aided communication if the interference added to the primary users is kept below a certain threshold in an underlay cognitive network. In particular, both the feedback delay and Doppler frequency shift are assumed to be within a tolerable range, and as compared with the conventional methods, less channel state information (CSI) feedback is required in the proposed method due to partial relay selection being performed in the latter. The proposed scheme is validated by carrying out both theoretical analysis and numerical simulation, and the theoretical approximations of closed-form expressions for some figures of merit, e.g., the outage probability, the SEP, and the channel capacity, are all consistent with the numerical results. The simulations also prove that the performance of the proposed scheme is considerably affected by some other critical parameters, such as the number of relays, the channel correlation coefficient, and the interference threshold. In the presence of multiple candidate relays, an optimum solution in terms of either the outage probability or the SEP performance can always be found within the SNR range of (0, 10 dB).
Sponsorship	IEEE Vehicular Technology Society
Starting Page	4696
Ending Page	4701
Page Count	6
File Size	890982
File Format	PDF
ISSN	00189545
Volume Number	62
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Relays Signal to noise ratio Channel capacity Interference Approximation methods Correlation Channel estimation partial relaying Amplify-and-forward (AF) cognitive radio cooperative networks outage probability outdated channel state information (CSI)
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Automotive Engineering Computer Networks and Communications Electrical and Electronic Engineering Aerospace Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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