Relay-Aided NOMA in Uplink Cellular Networks

Shin, Wonjae; Yang, Heecheol; Vaezi, Mojtaba; Lee, Jung Woo; Poor, H. Vincent

doi:10.1109/lsp.2017.2755049

Cited by 32 publications

(13 citation statements)

References 23 publications

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“…The authors demonstrated that cooperative scheme outperforms TDMA one in terms of OP. Shin et al [108] proposed a novel multiple-relayaided uplink NOMA scheme for multicell cellular networks where the BS was equipped with multiantenna and limited by user numbers in each cell. Moreover, the feasibility conditions of the considered system were investigated.…”

Section: Cooperative Nomamentioning

confidence: 99%

A Tutorial on Nonorthogonal Multiple Access for 5G and Beyond

Aldababsa

Toka

Gökçeli

et al. 2018

Wireless Communications and Mobile Computing

247

173

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Today's wireless networks allocate radio resources to users based on the orthogonal multiple access (OMA) principle. However, as the number of users increases, OMA based approaches may not meet the stringent emerging requirements including very high spectral efficiency, very low latency, and massive device connectivity. Nonorthogonal multiple access (NOMA) principle emerges as a solution to improve the spectral efficiency while allowing some degree of multiple access interference at receivers. In this tutorial style paper, we target providing a unified model for NOMA, including uplink and downlink transmissions, along with the extensions to multiple input multiple output and cooperative communication scenarios. Through numerical examples, we compare the performances of OMA and NOMA networks. Implementation aspects and open issues are also detailed.

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Section: Cooperative Nomamentioning

confidence: 99%

A Tutorial on Nonorthogonal Multiple Access for 5G and Beyond

Aldababsa

Toka

Gökçeli

et al. 2018

Wireless Communications and Mobile Computing

247

173

View full text Add to dashboard Cite

show abstract

“…The aforementioned works focus on downlink cooperative NOMA system, and there are also some research works on the uplink cooperative NOMA [12]- [15]. In [12], a relayaided NOMA technique is proposed for multi-cell uplink cellular networks. The proposed scheme does not require any channel state information at users, which can greatly reduce the control overhead.…”

Section: Introductionmentioning

confidence: 99%

Ergodic Capacity and Outage Performance Analysis of Uplink Full-Duplex Cooperative NOMA System

et al. 2020

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We propose an uplink full-duplex (FD) cooperative non-orthogonal multiple access (NOMA) system, where a dedicated Full-duplex (FD) relay is used to help two uplink users transmitting information to the base station. A novel FD relay transmission mode is proposed, in which the FD relay utilizes successive interference cancellation (SIC) and self-interference cancellation to decode two users symbols at the relay receiving antenna, and the relay transmitting antenna transmits superimposed signal to the base station using superposition coding. In this paper, we also consider a more realistic scenario where selfinterference cancellation is imperfect. Hence, the residual-self interference exists. Moreover, the ergodic sum rate and the outage probability of the proposed system are investigated and the accurate analytical expressions are derived. Simulation results validate that, compared with the uplink half-duplex (HD) cooperative NOMA system and the uplink HD cooperative orthogonal multiple access (OMA) system, our proposed system obtains better performance of the ergodic sum rate and outage probability in the main signal to noise ratio (SNR) regime.

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“…Cooperative communication is an effective scheme to overcome multipath propagation as well as enhance reception reliability of communication systems. Interplay between cooperative communication and NOMA constitute the cooperative NOMA systems which is widely studied in recent years [6][7][8][9][10][11][12][13][14]16]. According to the difference of selected relay node, the cooperative NOMA systems are mainly divided into two types: The first type of cooperative NOMA systems utilizes one NOMA user as the relay, while, the second type of cooperative NOMA systems mainly uses the dedicated relay as the relay.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a novel two-way relay selection cooperative NOMA system was also proposed by Yue et al [13]. Furthermore, considering the uplink situation, a uplink cooperative NOMA system was proposed with relay-aided for multi-cell circumstances [14].…”

Section: Introductionmentioning

confidence: 99%

Capacity Analysis of an AF Relay Cooperative NOMA System Using MRC

2020

KSII TIIS

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Non-orthogonal multiple access (NOMA) is widely studied in both academia and industry due to its high spectral efficiency over orthogonal multiple access (OMA). To effectively improve spectrum efficiency, an amplify-and-forward (AF) cooperative NOMA system is proposed as well as a novel detection scheme is proposed, in which we first perform successive interference cancellation (SIC) twice at U1 for the two signals received from two time slots to remove interference from symbol 2, then two new signals apply max ratio combining (MRC). In addition, a closed-form upper bound approximation for the ergodic capacity of our proposed system is derived. Monte-Carlo simulations and numerical analysis illustrate that our proposed system has better ergodic capacity performance than the conventional cooperative NOMA system with decode-forward (DF) relay, the conventional cooperative NOMA system with AF relay and the proposed AF cooperative NOMA system in [16]. In addition, we can see that ergodic capacity of all NOMA cooperative systems increase with the increase of transmit SNR. Finally, simulations display that power allocation coefficients have little effect on ergodic capacity of all NOMA cooperative systems. This is due to this fact that ergodic capacity of two symbols can be complementary with changing of power allocation coefficients.

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Relay-Aided NOMA in Uplink Cellular Networks

Cited by 32 publications

References 23 publications

A Tutorial on Nonorthogonal Multiple Access for 5G and Beyond

A Tutorial on Nonorthogonal Multiple Access for 5G and Beyond

Ergodic Capacity and Outage Performance Analysis of Uplink Full-Duplex Cooperative NOMA System

Capacity Analysis of an AF Relay Cooperative NOMA System Using MRC

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