Non-Orthogonal Multiple Access in Coordinated Direct and Relay Transmission

Kim, Jung-Bin; Lee, In-Ho

doi:10.1109/lcomm.2015.2474856

Cited by 406 publications

(329 citation statements)

References 6 publications

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“…Using (38) to solve (33) for the second Lagrange variable µ we obtain Finally, substituting (35) into (38) to obtain (11) and (12).…”

Section: Resultsmentioning

confidence: 99%

“…s | 2 , respectively, in (11) and (12). With the total available power being the same as the total transmission power per each RB (P RB ), apply the obtained sub-optimal solutions in (11) and (12) to find the power across the two groups to be P g1 and P g2 .…”

Section: A Hierarchical Pairing Power Allocation (Hppa)mentioning

confidence: 99%

“…In addition, the authors in [10] presented how NOMA could enhance the cell-edge user throughput while achieving fairness. In [11], [12] the same authors investigated the gains that relay assisted NOMA transmission could offer over the conventional NOMA system. In addition, a number of power allocation techniques have been proposed in [13]- [16], but none of the proposed techniques was in closed form.…”

Section: Introductionmentioning

confidence: 99%

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Resource Allocation in Non-Orthogonal and Hybrid Multiple Access System With Proportional Rate Constraint

Al-Abbasi

2017

IEEE Trans. Wireless Commun.

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Abstract-Non-orthogonal multiple access (NOMA) has attracted a lot of attention recently due to its superior spectral efficiency and could play a vital role in improving the capacity of future networks. In this paper, a resource allocation scheme is developed for a downlink multi-user NOMA system. An optimization problem is formulated to maximize the sum rate under the total power and proportional rate constraints. Due to the complexity of computing the optimal solution, we develop a low complexity sub-optimal solution for two-user scenario and then extend it to the multi-user case by proposing a user-pairing approach as well as a number of power allocation techniques that facilitate dealing with a large number of users in NOMA system. Simulation results support the effectiveness of the proposed approaches and show the close performance to the optimal one. In addition, we propose a new hybrid multiple access technique that combines the properties of NOMA and the orthogonal frequency division multiple access (OFDMA). Simulation results show that the proposed hybrid method provides better performance than NOMA in terms of the overall achievable sum rate and the coverage probability.

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“…Using (38) to solve (33) for the second Lagrange variable µ we obtain Finally, substituting (35) into (38) to obtain (11) and (12).…”

Section: Resultsmentioning

confidence: 99%

Section: A Hierarchical Pairing Power Allocation (Hppa)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Resource Allocation in Non-Orthogonal and Hybrid Multiple Access System With Proportional Rate Constraint

Al-Abbasi

2017

IEEE Trans. Wireless Commun.

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“…CRS using NOMA achieves more SE than conventional CRS when the SNR is high and the average channel power of the source-to-relay link is superior to the source-to-destination and relay-to-destination links. The concept of relaying can also be adopted to extend the cell coverage or overcome shadowing in case of NOMA transmission [29] where a BS can directly communicate with a nearby user while communicating with a distant user only through a relay. In this system, the BS transmits a superposed signal to the relay and the nearby user during the first time slot.…”

Section: B Cooperative Noma (C-noma)mentioning

confidence: 99%

Power-Domain Non-Orthogonal Multiple Access (NOMA) in 5G Systems: Potentials and Challenges

Islam

Avazov

Dobre

et al. 2017

IEEE Commun. Surv. Tutorials

1,946

1,134

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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. I. INTRODUCTIONFrom analog phone calls through to all Internet Protocol services, including voice and messaging, each transition has been encouraged by the need to meet the requirements of the new generation of mobile technology. Subsequently, mobile communications technology is presently facing a new challenge, giving birth to a hyper-connected society through the emergence of fifth-generation (5G) services. With enormous potential for both consumers and industry, 5G is expected to roll out by 2020. From the next-generation radio access technology viewpoint, a step change in data speed and a significant reduction in end-to-end latency is a major concern for 5G, since the rapid development of the mobile Internet and the Internet of Things (IoT) exponentially accelerates the demand for high data-rate applications. In particular, many of the industry initiatives that have progressed with work on 5G declare that the network-level data rate in 5G should be 10-20 Gbps (that is, 10-20 times the peak data rate in 4G), and the user-experienced data rate should be 1 Gbps (100 times the user-experienced data rate in 4G). They also set the latency (end-to-end round-trip delay) at 1 millisecond (one-fifth of the latency in 4G).The underlying physical connection in a cellular network is called radio access technology, which is implemented by a radio access network (RAN). A RAN basically utilizes a channel access technique to provide the mobile terminals with a connection to the core network. The design of a suitable multiple access technique is one of the most important aspects in improvi...

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“…Moreover, NOMA has been demonstrated to be compatible with other emerging technologies [11][12][13][14]. In particular, the impact of imperfect self-interference cancellation for full-duplex cooperative NOMA is investigated in [12], while authors in [13] study the combination of NOMA and relay selection and results show that the proposed strategy can provide maximal diversity gain.…”

Section: Introductionmentioning

confidence: 99%

Impact of Antenna Selection on Physical-Layer Security of NOMA Networks

Deng

Fan

et al. 2018

Wireless Communications and Mobile Computing

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This paper studies the impacts of antenna selection algorithms in decode-and-forward (DF) cooperative nonorthogonal multiple access (NOMA) networks, where the secure information from the relay can be overheard by an eavesdropper in the networks. In order to ensure the secure transmission, an optimal antenna selection algorithm is proposed to choose one best relay's antenna to assist the secure transmission. We study the impact of antenna selection on the system secure communication through deriving the analytical expression of the secrecy outage probability along with the asymptotic expression in the high regime of signal-tonoise ratio (SNR) and main-to-eavesdropper ratio (MER). From the analytical and asymptotic expressions, we find that the system secure performance is highly dependent on the system parameters such as the number of antennas at the relay, SNR, and MER. In particular, the secrecy diversity order of the system is equal to the antenna number, when the interference from the second user is limited.

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Non-Orthogonal Multiple Access in Coordinated Direct and Relay Transmission

Cited by 406 publications

References 6 publications

Resource Allocation in Non-Orthogonal and Hybrid Multiple Access System With Proportional Rate Constraint

Resource Allocation in Non-Orthogonal and Hybrid Multiple Access System With Proportional Rate Constraint

Power-Domain Non-Orthogonal Multiple Access (NOMA) in 5G Systems: Potentials and Challenges

Impact of Antenna Selection on Physical-Layer Security of NOMA Networks

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