January 2019
Intermediate to advanced
320 pages
10h 9m
English
book
Wireless Information and Power Transfer
by Derrick Wing Kwan Ng, Trung Q. Duong, Caijun Zhong, Robert Schober
Content preview from Wireless Information and Power Transfer
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6On the Application of SWIPT in NOMA Networks
Yuanwei Liu* and Maged Elkashlan
Electronic Engineering and Computer Science, Queen Mary University of London, United Kingdom
6.1 Introduction
Due to the increasing number of devices to be connected in fifth‐generation (5G) and Internet of Things (IoT) networks, spectrum efficiency becomes a very challenging issue even though extensive research work has been carried out to solve the spectral scarcity problem [1, 2]. Non‐orthogonal multiple access (NOMA) is an effective solution to improve spectral efficiency and has recently received significant attention for its promising application in 5G networks [3–7, 12, 13, 30]. The key idea of NOMA is to realize multiple access (MA) in the power domain, which is fundamentally different from conventional orthogonal MA technologies (e.g., time/frequency/code division MA). The motivation behind this approach lies in the fact that NOMA can use spectrum more efficiently by opportunistically exploring users' channel conditions [8]. In [9], the authors investigated the performance of a downlink NOMA scheme with randomly deployed users. An uplink NOMA transmission scheme was proposed in [10], and its performance was evaluated systematically. In [8], the impact of user pairing was characterized by analyzing the sum rates in two NOMA systems, namely, fixed power allocation NOMA and cognitive radio inspired NOMA. In [11], a new cooperative NOMA scheme was proposed and analyzed in terms of outage probability ...
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