NDLI: Achieving Space Diversity with Non-Coherent AF Relaying

Content Provider	IEEE Xplore Digital Library
Author	Song, S.H. Letaief, K.B.
Copyright Year	2011
Abstract	In a multi-relay system, the instantaneous channel state information (CSI) is usually required at relays to achieve the space diversity. In this paper, we propose a delayed noncoherent relaying scheme to achieve space diversity without requiring knowledge of the instantaneous CSI at the relays. Specifically, each relay will non-coherently amplify and forward its received signals with different delays such that a virtual multipath channel is created between the source and destination. We will first determine the most efficient way to achieve the optimal diversity gain. We will then show that, with spreading or coding, the proposed non-coherent relaying can provide the same diversity order as its coherent counterpart but with a noncoherent penalty. With the simplest spreading scheme, the noncoherent penalty results in a loss of both multiplexing gain and finite-SNR diversity gain. To recover the loss due to this noncoherent penalty, a distributed relay selection algorithm, which can achieve a better outage performance with less energy, is proposed. On the other hand, with the Gaussian-coded noncoherent relaying, no multiplexing gain loss will be incurred but a loss of SNR gain will occur.
Starting Page	1
Ending Page	5
File Size	149836
Page Count	5
File Format	PDF
ISBN	9781612842325
ISSN	15503607
e-ISBN	9781612842332
e-ISBN	9781612842318
DOI	10.1109/icc.2011.5962468
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-05
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Relays Signal to noise ratio Diversity methods Diversity reception Multiplexing Multipath channels Frequency domain analysis
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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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