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A case for adaptive sub-carrier level power allocation in OFDMA networks

Singh, S and Shahbazi, M and Pelechrinis, K and Sundaresan, K and Krishnamurthy, SV and Addepalli, S (2012) A case for adaptive sub-carrier level power allocation in OFDMA networks. In: UNSPECIFIED.

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In today's OFDMA networks, the transmission power is typically fixed and the same for all the sub-carriers that compose a channel. The sub-carriers though, experience different degrees of fading and thus, the received power is different for different sub-carriers; while some frequencies experience deep fades, others are relatively unaffected. In this paper, we make a case of redistributing the power across the sub-carriers (subject to a fixed power budget constraint) to better cope with this frequency selectivity. Specifically, we design a joint power and rate adaptation scheme (called JPRA for short) wherein power redistribution is combined with sub-carrier level rate adaptation to yield significant throughput benefits. We further consider two variants of JPRA: (a) JPRA-CR where, the power is redistributed across sub-carriers so as to support a maximum common rate (CR) across sub-carriers and (b) JPRA-MT where, the goal is to redistribute power such that the transmission time of a packet is minimized. While the first variant decreases transceiver complexity and is simpler, the second is geared towards achieving the maximum throughput possible. We implement both variants of JPRA on our WARP radio testbed. Our extensive experiments demonstrate that our scheme provides a 35% improvement in total network throughput in testbed experiments compared to FARA, a scheme where only sub-carrier level rate adaptation is used. We also perform simulations to demonstrate the efficacy of JPRA in larger scale networks. © 2012 ACM.


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Item Type: Conference or Workshop Item (UNSPECIFIED)
Status: Published
CreatorsEmailPitt UsernameORCID
Singh, S
Shahbazi, M
Pelechrinis, Kkpele@pitt.eduKPELE0000-0002-6443-3935
Sundaresan, K
Krishnamurthy, SV
Addepalli, S
Date: 11 July 2012
Date Type: Publication
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Journal or Publication Title: Proceedings of the International Symposium on Mobile Ad Hoc Networking and Computing (MobiHoc)
Page Range: 225 - 234
Event Type: Conference
DOI or Unique Handle: 10.1145/2248371.2248404
Institution: University of Pittsburgh
Schools and Programs: School of Information Sciences > Telecommunications
Refereed: Yes
ISBN: 9781450312813
Date Deposited: 13 Jun 2012 15:30
Last Modified: 13 May 2020 12:55


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