Abstract
Non-orthogonal multiple access (NOMA) is becoming one of the promising technologies for the fifth generation (5G) and beyond 5G (B5G) communications due to its ability of connecting massive wireless devices. Meanwhile, backscatter communication (BSCom) is emerging as a key solution to the Internet of Things (IoTs) due to its energy efficiency. In this chapter, we first provide a brief introduction of NOMA technology, discuss its fundamental concepts, and outline its applications. Then, we discuss the basic concepts of BSCom systems in brief, describe its different configurations, highlight the challenges of NOMA-enabled BSCom systems, and discuss the recent solutions. Moreover, we provide the basics of physical layer security (PLS) in wireless communication systems. Using the aforementioned backgrounds, we formulate an optimization problem for secrecy rate maximization in NOMA-enabled BSCom in the presence of multiple eavesdroppers. The problem is subjected to backscatter device (BSD) reflection coefficient and base station (BS) power according to NOMA protocol. To efficiently solve the optimization problem, we exploit the duality theory. For the purpose of comparison, we also present a conventional orthogonal multiple access (OMA)-enabled BSCom system as a benchmark. Finally, we present the simulation results and conclude this chapter with future research directions.
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