NDLI: Optimal Relay Control in Power-Constrained Dual-Hop Transmissions over Arbitrary Fading Channels

Content Provider	IEEE Xplore Digital Library
Author	Gatzianas, M.A. Georgiadis, L.G. Karagiannidis, G.K.
Copyright Year	2006
Description	Author affiliation: Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, GR-54214, Thessaloniki, Greece; Center for Research and Technology Hellas. E-mail: leonid@auth.gr (Georgiadis, L.G.) \|\| Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, GR-54214, Thessaloniki, Greece. E-mail: mgkatzia@auth.gr (Gatzianas, M.A.) \|\| Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, GR-54214, Thessaloniki, Greece. E-mail: geokarag@auth.gr (Karagiannidis, G.K.)
Abstract	This paper examines the performance of a dualhop, noise-limited, non-regenerative system where the relay gain is allowed to vary as an unknown deterministic function of the channel states, subject to instantaneous (i.e. peak) and average power constraints, the latter directly affecting battery lifetime in wireless systems. A convex optimization problem, in terms of a generic performance metric, is formulated and solved algorithmically for the Signal-to-Noise Ratio (SNR), Shannon rate and BPSK Bit-Error-Rate (BER) utilities. The presented model allows for arbitrary statistics of the fading channels, including correlation between them. Special emphasis is placed on the relation between the optimal solutions obtained when observing the channels of either the first or both hops. The regions in channel state space where zero and full power is allocated are determined in closed form, with numerical results being presented for the Shannon rate and BER utilities. It is observed that, for sufficiently high first hop SNR, monitoring both channels instead of just the first hop can lead to a significant performance increase.
Starting Page	4543
Ending Page	4548
File Size	181795
Page Count	6
File Format	PDF
ISBN	1424403553
ISSN	81649547
DOI	10.1109/ICC.2006.255355
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-06-11
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Relays Optimal control Fading Power system relaying Bit error rate Performance gain Batteries Measurement Signal to noise ratio Binary phase shift keying
Content Type	Text
Resource Type	Article

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