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2018 | OriginalPaper | Chapter

Impact of Uncertainty About a User to be Active on OFDM Transmission Strategies

Authors : Andrey Garnaev, Wade Trappe, Ratnesh Kumbhkar, Narayan B. Mandayam

Published in: Cognitive Radio Oriented Wireless Networks

Publisher: Springer International Publishing

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Abstract

In this paper we investigate the impact that incomplete knowledge regarding user activity can have on the equilibrium transmission strategy for an OFDM-based communication system. The problem is formulated as a two user non-zero sum game for independent fading channel gains, where the equilibrium strategies are derived in closed form. This allows one to show that a decrease in uncertainty about the user activity could reduce the number of subcarriers jointly used by the users. For the boundary case (with complete information, which reflects a classical water-filling game) the equilibrium strategies are given explicitly. The necessary and sufficient conditions, when channels sharing strategies are optimal, is established as well as the set of shared subcarriers is identified. The stability of the upper bound of the size of this set with respect to power budgets is derived.

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Title: Impact of Uncertainty About a User to be Active on OFDM Transmission Strategies
Authors: Andrey Garnaev
Wade Trappe
Ratnesh Kumbhkar
Narayan B. Mandayam
Publisher: Springer International Publishing
Book: Cognitive Radio Oriented Wireless Networks
Print ISBN: 978-3-319-76206-7

Electronic ISBN: 978-3-319-76207-4

Copyright Year: 2018
DOI: https://doi.org/10.1007/978-3-319-76207-4_18

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