Power-Domain Non-Orthogonal Multiple Access (NOMA) in 5G Systems: Potentials and Challenges
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In this paper, the authors comprehensively survey the recent progress of NOMA in 5G systems, reviewing the state-of-the-art capacity analysis, power allocation strategies, user fairness, and user-pairing schemes in NOMAs.Abstract:
Non-orthogonal multiple access (NOMA) is one of the promising radio access techniques for performance enhancement in next-generation cellular communications. Compared to orthogonal frequency division multiple access (OFDMA), which is a well-known high-capacity orthogonal multiple access (OMA) technique, NOMA offers a set of desirable benefits, including greater spectrum efficiency. There are different types of NOMA techniques, including power-domain and code-domain. This paper primarily focuses on power-domain NOMA that utilizes superposition coding (SC) at the transmitter and successive interference cancellation (SIC) at the receiver. Various researchers have demonstrated that NOMA can be used effectively to meet both network-level and user-experienced data rate requirements of fifth-generation (5G) technologies. From that perspective, this paper comprehensively surveys the recent progress of NOMA in 5G systems, reviewing the state-of-the-art capacity analysis, power allocation strategies, user fairness, and user-pairing schemes in NOMA. In addition, this paper discusses how NOMA performs when it is integrated with various proven wireless communications techniques, such as cooperative communications, multiple input multiple output (MIMO), beamforming, space time coding, and network coding, among others. Furthermore, this paper discusses several important issues on NOMA implementation and provides some avenues for future research.read more
Citations
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Proceedings ArticleDOI
Outage performance of time switching energy harvesting wireless sensor networks deploying NOMA
TL;DR: This work evaluates an energy harvesting wireless sensor network deploying NOMA, where the destination can receive two data symbols the whole transmission process with two time slots, and derives expressions for the achievable data rate and outage probability.
Proceedings ArticleDOI
A Portable SDR Non-Orthogonal Multiple Access Testbed for 5G Networks
TL;DR: A portable NOMA testbed based on software defined radio (SDR) is developed by transporting the N OMA system to mini personal computers (PCs) and the performance of processors may be a short slab for the development of portable SDR-based testbeds towards 5G networks.
Journal ArticleDOI
Fixed Power Allocation for Outage Performance Analysis on AF-assisted Cooperative NOMA
TL;DR: New radio access scheme that combining relaying protocol and Non-orthogonal Multiple access (NOMA) system is introduced and outage probability of both weak and strong user is derived and provided in closed-form expressions.
Journal ArticleDOI
Stable Throughput Region and Average Delay Analysis of Uplink NOMA Systems With Unsaturated Traffic
TL;DR: It is interestingly found that the superiority of NOMA over OMA in terms of average delay heavily hinges on the temporal traffic dynamics of each user.
Journal ArticleDOI
Compute-and-Forward for Uplink Non-Orthogonal Multiple Access
TL;DR: A new decoding method for uplink NOMA based on compute-and-forward is proposed that achieves better fairness and smaller average outage probabilities while enjoying essentially the same complexity as SIC decoding.
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