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SEP-optimal adaptive gain and transmit power amplify-and-forward relaying

Sainath, B and Mehta, Neelesh B (2012) SEP-optimal adaptive gain and transmit power amplify-and-forward relaying. In: IEEE International Conference on Communication Systems (ICCS), NOV 21-23, 2012, Singapore, SINGAPORE, pp. 220-224.

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Official URL: http://dx.doi.org/10.1109/ICCS.2012.6406142


Amplify-and-forward (AF) relay based cooperation has been investigated in the literature given its simplicity and practicality. Two models for AF, namely, fixed gain and fixed power relaying, have been extensively studied. In fixed gain relaying, the relay gain is fixed but its transmit power varies as a function of the source-relay (SR) channel gain. In fixed power relaying, the relay's instantaneous transmit power is fixed, but its gain varies. We propose a general AF cooperation model in which an average transmit power constrained relay jointly adapts its gain and transmit power as a function of the channel gains. We derive the optimal AF gain policy that minimizes the fading- averaged symbol error probability (SEP) of MPSK and present insightful and tractable lower and upper bounds for it. We then analyze the SEP of the optimal policy. Our results show that the optimal scheme is up to 39.7% and 47.5% more energy-efficient than fixed power relaying and fixed gain relaying, respectively. Further, the weaker the direct source-destination link, the greater are the energy-efficiency gains.

Item Type: Conference Paper
Publisher: IEEE
Additional Information: Copyright of this article belongs to IEEE.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 08 Jul 2013 07:26
Last Modified: 08 Jul 2013 07:26
URI: http://eprints.iisc.ac.in/id/eprint/46835

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