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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 (2015) Adaptive sub-carrier level power allocation in OFDMA networks. IEEE Transactions on Mobile Computing, 14 (1). 28 - 41. ISSN 1536-1233

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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 for 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 three variants of JPRA: (a) JPRA-Basic where, the power is redistributed across sub-carriers so as to support a maximum common rate across all the sub-carriers (b) JPRA-Intermediate where, the power is redistributed across sub-carriers so as to support a maximum common rate across a 'subset' of sub-carriers such that the aggregate rate is maximized. (c) JPRA-Adaptive where, the goal is to redistribute power such that the transmission time of a packet is minimized. While the first two variants decrease transceiver complexity and are simpler, the third is geared towards achieving the maximum throughput possible. We implement all three variants of JPRA on our WARP radio testbed. Our extensive experiments demonstrate that JPRA can provide a 35 percent 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.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Singh, S
Shahbazi, M
Pelechrinis, Kkpele@pitt.eduKPELE0000-0002-6443-3935
Sundaresan, K
Krishnamurthy, SV
Addepalli, S
Date: 1 January 2015
Date Type: Publication
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Journal or Publication Title: IEEE Transactions on Mobile Computing
Volume: 14
Number: 1
Page Range: 28 - 41
DOI or Unique Handle: 10.1109/tmc.2014.2312716
Institution: University of Pittsburgh
Schools and Programs: School of Information Sciences > Telecommunications
Refereed: Yes
ISSN: 1536-1233
Date Deposited: 11 Jun 2014 15:11
Last Modified: 13 May 2020 12:55


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