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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Nonorthogonal Multiple Access for 5G and Beyond
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A Survey of Non-Orthogonal Multiple Access for 5G
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References
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Proceedings ArticleDOI
Sparse code multiple access
Hosein Nikopour,Hadi Baligh +1 more
TL;DR: A new multiple access scheme so called sparse code multiple access (SCMA) is proposed which still enjoys the low complexity reception technique but with better performance compared to LDS, allowing us to take advantage of a near optimal ML receiver with practically feasible complexity.
Journal ArticleDOI
Cooperative Non-Orthogonal Multiple Access in 5G Systems
TL;DR: In this article, a cooperative NOMA scheme is proposed, where users with better channel conditions have prior information about the messages of other users, and an approach based on user pairing is also proposed to reduce system complexity.
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OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting
TL;DR: In this article, the benefits of channel coding and space time coding in the context of various application examples and features numerous complete system design examples are discussed. But the authors do not discuss the trade-off between channel quality fluctuations and frequency domain spreading codes.
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OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting: Hanzo/OFDM
TL;DR: This first complete treatment of OFDM, MIMO(Multiple Input Multiple Output)-OFDM and MC-CDMAC considers the benefits of channel coding and space time coding in the context of various application examples and features numerous complete system design examples.
Journal ArticleDOI
Fairness for Non-Orthogonal Multiple Access in 5G Systems
TL;DR: In this article, the authors investigated power allocation in NOMA from a fairness perspective and developed low-complexity polynomial algorithms that yield the optimal solution in both cases considered.