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Sensors 2018, 18(2), 516;

Non-Orthogonal Multiple Access for Ubiquitous Wireless Sensor Networks

Department of Electrical and Electronic Engineering, Auckland University of Technology, Auckland 1010, New Zealand
School of Computing and Communications, Lancaster University, Lancaster LA1 4YW, UK
Author to whom correspondence should be addressed.
Received: 31 December 2017 / Revised: 3 February 2018 / Accepted: 7 February 2018 / Published: 8 February 2018
(This article belongs to the Special Issue Non-Orthogonal Multi-User Transmissions for 5G Networks)
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Ubiquitous wireless sensor networks (UWSNs) have become a critical technology for enabling smart cities and other ubiquitous monitoring applications. Their deployment, however, can be seriously hampered by the spectrum available to the sheer number of sensors for communication. To support the communication needs of UWSNs without requiring more spectrum resources, the power-domain non-orthogonal multiple access (NOMA) technique originally proposed for 5th Generation (5G) cellular networks is investigated for UWSNs for the first time in this paper. However, unlike 5G networks that operate in the licensed spectrum, UWSNs mostly operate in unlicensed spectrum where sensors also experience cross-technology interferences from other devices sharing the same spectrum. In this paper, we model the interferences from various sources at the sensors using stochastic geometry framework. To evaluate the performance, we derive a theorem and present new closed form expression for the outage probability of the sensors in a downlink scenario under interference limited environment. In addition, diversity analysis for the ordered NOMA users is performed. Based on the derived outage probability, we evaluate the average link throughput and energy consumption efficiency of NOMA against conventional orthogonal multiple access (OMA) technique in UWSNs. Further, the required computational complexity for the NOMA users is presented. View Full-Text
Keywords: cross-technology interference; non-orthogonal multiple access; stochastic geometry; unlicensed spectrum; ubiquitous wireless sensor networks cross-technology interference; non-orthogonal multiple access; stochastic geometry; unlicensed spectrum; ubiquitous wireless sensor networks

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Anwar, A.; Seet, B.-C.; Ding, Z. Non-Orthogonal Multiple Access for Ubiquitous Wireless Sensor Networks. Sensors 2018, 18, 516.

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