Impact of User Pairing on 5G Non-Orthogonal Multiple Access

Ding, Zhiguo; Fan, Pingzhi; Poor, H. Vincent

doi:10.48550/arxiv.1412.2799

Cited by 18 publications

(14 citation statements)

References 6 publications

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“…Conventionally it is preferable to schedule the users whose channel conditions are superior, but in the context of NOMA, it is important to schedule users whose channel conditions are very distinct. This is consistent with the findings obtained for single-antenna NOMA cases in [1] and [10].…”

Section: Introductionsupporting

confidence: 93%

“…It is important to point out that the diversity gain at the n-th user is constrained by the k-th user's channel condition due to the use of (35), which is consistent with the finding in [10]. Recall that cognitive radio inspired NOMA with signal-antenna nodes can achieve a diversity of (K −k +1) for both users [10].…”

Section: A To Meet a Fixed Qos Requirementsupporting

confidence: 75%

“…The user fairness of NOMA has been considered in [9] by studying the impact of different choices of power allocation coefficients. In [10] a cognitive radio inspired NOMA scheme was proposed, in which the power allocation coefficients are chosen to meet the predefined users' quality of service (QoS) requirements.…”

Section: Introductionmentioning

confidence: 99%

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The Application of MIMO to Non-Orthogonal Multiple Access

Ding

Adachi

Poor

2016

IEEE Trans. Wireless Commun.

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834

590

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This paper considers the application of multiple-input multiple-output (MIMO) techniques to non-orthogonal multiple access (NOMA) systems. A new design of precoding and detection matrices for MIMO-NOMA is proposed and its performance is analyzed for the case with a fixed set of power allocation coefficients. To further improve the performance gap between MIMO-NOMA and conventional orthogonal multiple access schemes, user pairing is applied to NOMA and its impact on the system performance is characterized. More sophisticated choices of power allocation coefficients are also proposed to meet various quality of service requirements. Finally computer simulation results are provided to facilitate the performance evaluation of MIMO-NOMA and also demonstrate the accuracy of the developed analytical results.

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Section: Introductionsupporting

confidence: 93%

Section: A To Meet a Fixed Qos Requirementsupporting

confidence: 75%

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The Application of MIMO to Non-Orthogonal Multiple Access

Ding

Adachi

Poor

2016

IEEE Trans. Wireless Commun.

Self Cite

834

590

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“…The performance of NOMA in scenarios with single-antenna users has been studied in [4] and [5]. Achieving user fairness with different channel state information (CSI) in NOMA systems has been addressed in [6], and the impact of user pairing on NOMA has been investigated in [7].…”

Section: Introductionmentioning

confidence: 99%

MIMO-NOMA Design for Small Packet Transmission in the Internet of Things

2016

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A feature of the Internet of Things (IoT) is that some users in the system need to be served quickly for small packet transmission. To address this requirement, a new multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) scheme is designed in this paper, where one user is served with its quality of service (QoS) requirement strictly met, and the other user is served opportunistically by using the NOMA concept. The novelty of this new scheme is that it confronts the challenge that most existing MIMO-NOMA schemes rely on the assumption that users' channel conditions are different, a strong assumption which may not be valid in practice. The developed precoding and detection strategies can effectively create a significant difference between the users' effective channel gains, and therefore the potential of NOMA can be realized even if the users' original channel conditions are similar. Analytical and numerical results are provided to demonstrate the performance of the proposed MIMO-NOMA scheme.

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“…Moreover, Ding and co-authors in [10]- [11] discuss the superior performance of NOMA in terms of ergodic sum rates and the importance of power allocation, and a cooperative NOMA scheme where users with higher channel gains have prior information about other users' messages, respectively. Finally, Ding, Fan and Poor in [12] study user pairing on two NOMA schemes and how it affects the sum rate. The first scheme, F-NOMA, with fixed power allocation, pairs users with very distinctive channel conditions, whereas the second one, CR-NOMA, inspired by cognitive radio, pairs users with similar channel conditions.…”

Section: Introductionmentioning

confidence: 99%

A hybrid TIM-NOMA scheme for the SISO Broadcast Channel

Kalokidou

Johnson

Piechocki

2015

2015 IEEE International Conference on Communication Workshop (ICCW)

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Abstract-Future mobile communication networks will require enhanced network efficiency and reduced system overhead due to their user density and high data rate demanding applications of the mobile devices. Research on Blind Interference Alignment (BIA) and Topological Interference Management (TIM) has shown that optimal Degrees of Freedom (DoF) can be achieved, in the absence of Channel State Information (CSI) at the transmitters, reducing the network's overhead. Moreover, the recently emerged Non-Orthogonal Multiple Access (NOMA) scheme suggests a different multiple access approach, compared to the current orthogonal methods employed in 4G networks, resulting in high capacity gains. Our contribution is a hybrid TIM-NOMA scheme in Single-Input-Single-Output (SISO) Kuser cells, in which users are divided into T groups, and 1/T DoF is achieved for each user. By superimposing users in the power domain, we introduce a two-stage decoding process, managing "inter-group" interference based on the TIM principles, and "intra-group" interference based on Successful Interference Cancellation (SIC), as proposed by NOMA. We show that for high SNR values the hybrid scheme can improve the sum rate by at least 100% when compared to Time Division Multiple Access (TDMA).

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Impact of User Pairing on 5G Non-Orthogonal Multiple Access

Cited by 18 publications

References 6 publications

The Application of MIMO to Non-Orthogonal Multiple Access

The Application of MIMO to Non-Orthogonal Multiple Access

MIMO-NOMA Design for Small Packet Transmission in the Internet of Things

A hybrid TIM-NOMA scheme for the SISO Broadcast Channel

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