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NOMA-enhanced computation over multi-access channels
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Wu, Fangzhou, Chen, Li, Zhao, Nan, Chen, Yunfei, Yu, F. Richard and Wei, Guo (2020) NOMA-enhanced computation over multi-access channels. IEEE Transactions on Wireless Communications, 19 (4). pp. 2252-2267. doi:10.1109/TWC.2019.2963654 ISSN 1536-1276.
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WRAP-NOMA-enhanced-computation-over-multi-access-channels-Chen-2020.pdf - Accepted Version - Requires a PDF viewer. Download (1901Kb) | Preview |
Official URL: https://doi.org/10.1109/TWC.2019.2963654
Abstract
Massive numbers of nodes will be connected in future wireless networks. This brings great difficulty to collect a large amount of data. Instead of collecting the data individually, computation over multi-access channels (CoMAC) provides an intelligent solution by computing a desired function over the air based on the signal-superposition property of wireless channels. To improve the spectrum efficiency in conventional CoMAC, we propose the use of non-orthogonal multiple access (NOMA) for functions in CoMAC. The desired functions are decomposed into several sub-functions, and multiple sub-functions are selected to be superposed over each resource block (RB). The corresponding achievable rate is derived based on sub-function superposition, which prevents a vanishing computation rate for large numbers of nodes. We further study the limiting case when the number of nodes goes to infinity. An exact expression of the rate is derived that provides a lower bound on the computation rate. Compared with existing CoMAC, the NOMA-based CoMAC not only achieves a higher computation rate but also provides an improved non-vanishing rate. Furthermore, the diversity order of the computation rate is derived, which shows that the system performance is dominated by the node with the worst channel gain among these sub-functions in each RB.
Item Type: | Journal Article | |||||||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||
Library of Congress Subject Headings (LCSH): | Wireless communication systems, Mobile communication systems, Multiplexing, Multiple access protocols (Computer network protocols) | |||||||||
Journal or Publication Title: | IEEE Transactions on Wireless Communications | |||||||||
Publisher: | IEEE | |||||||||
ISSN: | 1536-1276 | |||||||||
Official Date: | April 2020 | |||||||||
Dates: |
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Volume: | 19 | |||||||||
Number: | 4 | |||||||||
Page Range: | pp. 2252-2267 | |||||||||
DOI: | 10.1109/TWC.2019.2963654 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Reuse Statement (publisher, data, author rights): | © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 7 January 2020 | |||||||||
Date of first compliant Open Access: | 13 January 2020 | |||||||||
RIOXX Funder/Project Grant: |
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