Coordinated Beamforming for Multi-Cell MIMO-NOMA

Shin, Wonjae; Vaezi, Mojtaba; Lee, Byungju; Love, David J.; Lee, Jungwoo; Poor, H. Vincent

doi:10.1109/lcomm.2016.2615097

Cited by 189 publications

(104 citation statements)

References 10 publications

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“…In CB, data are available at only one BS and the beamforming (BF) decision is made on based on global CSI, which must be accurate, and this poses a possible drawback. In [35], a possible solution is proposed in which joint optimization of BF vectors for BSs is performed such that there are no ICI and intercluster interference. An interference alignment (IA) based CB algorithm is proposed that uses only edge user channel information and as the number of users increases, ICI is minimized without the need for any CSI.…”

Section: Coordinated Processing (Cp)mentioning

confidence: 99%

Dynamic Fractional Frequency Reuse Diversity Design for Intercell Interference Mitigation in Nonorthogonal Multiple Access Multicellular Networks

Mehmood

Niaz

Kim

2018

Wireless Communications and Mobile Computing

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Nonorthogonal multiple access (NOMA) is one of the few promising techniques that can ensure the achievement of benefits foreseen in next-generation 5G wireless networks and beyond. By using superposition coding, NOMA allows multiple users to share the same time and frequency resources, thereby enhancing user connectivity, spectral efficiency, and a considerable increase in user throughput. Interference mitigation is an important consideration in NOMA and is considerably more influencing in multicellular environments. First, a brief description of the impairments that can arise in a NOMA cellular network along with responsible factors is provided. Second, different approaches adopted to minimize these impairments are discussed. Finally, a possible solution is proposed that consists of a coordinated approach between the individual cells in the NOMA domain to minimize interferences and improve user throughput. Adaptive fractional frequency reuse (FFR) is used to allocate distinct frequency resources to edge users of different cells to minimize intercell interference in NOMA. Simulation results prove that the proposed NOMA scheme plays an important role in minimizing impairment effects and enhancing the SINR and the throughput performance of edge users while ensuring fairness in its design.

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Section: Coordinated Processing (Cp)mentioning

confidence: 99%

Dynamic Fractional Frequency Reuse Diversity Design for Intercell Interference Mitigation in Nonorthogonal Multiple Access Multicellular Networks

Mehmood

Niaz

Kim

2018

Wireless Communications and Mobile Computing

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“…As such, NOMA has drawn a great deal of attention from both academia and industry (see, e.g., [1]- [3] and the references therein). However, most of the existing studies on NOMA are limited to the single-cell setup, while only a handful of works have recently addressed the more challenging multi-cell scenario (see e.g., [4]- [7]). For multi-cell NOMA, inter-cell interference (ICI) is a major issue as it makes the successive interference cancellation (SIC) design far more complicated as compared to the single-cell case without ICI, especially for cell-edge user equipments (UEs) that generally suffer strong co-channel interference from other cells.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the work [6] developed a general cooperation model with coexisting CoMP and non-CoMP UEs, and NOMA is applied at each BS to schedule their communications over the same resource block (RB). The authors in [7] proposed two interference alignment-based cooperative NOMA schemes so as to completely eliminate the ICI suffered by cell-edge UEs. As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Cooperative NOMA for Downlink Asymmetric Interference Cancellation

Mei

Zhang

2020

IEEE Wireless Commun. Lett.

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This letter advances the non-orthogonal multiple access (NOMA) technique for cellular downlink co-channel interference mitigation, via exploiting the (limited) cooperation among base stations (BSs). Specifically, we consider a simplified but practically relevant scenario of two co-channel cells with asymmetric interference, i.e., only the user in one cell receives the strong interference from the BS in the other cell. To mitigate such interference, we propose a new cooperative NOMA scheme, where the interfered user's serving BS sends a superposed signal comprising both the desired message and the co-channel user's message (shared by the interfering BS). The co-channel user's signal is aimed to add constructively with the interfering BS's signal at the interfered user's receiver so that the combined interference with enhanced power can be effectively decoded and cancelled. This thus leads to a new problem on how to optimally allocate the transmit power for the two superposed messages. We provide the closed-form solution to this problem and investigate the conditions under which the performance of the proposed scheme is superior over the existing schemes.

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“…Multi‐input multioutput‐based nonorthogonal multiple access (MIMO‐NOMA) schemes have received significant attention . Designers conduct NOMA by conventionally clustering it into two user classes: (1) strong users (SUs) which can be considered as energy receivers (ERs), experiencing significantly more acceptable channel conditions, and (2) weak users (WUs) as the cell‐edge users (CEUs) with weak channel conditions.…”

Section: Introductionmentioning

confidence: 99%

“…One important issue is to efficiently tackle the residual intrainterference caused by SUs on WUs. This is the basic idea of the successive interference cancellation (SIC), widely applied in NOMA . With SIC, SUs remove the interference form the WUs' messages, conversely, WUs cannot remove the interference from the SUs' messages.…”

Section: Introductionmentioning

confidence: 99%

PHY‐layer Security of MIMO‐NOMA with SWIPT

Zamanipour

2019

Internet Technology Letters

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A flexible and secure artificial noise (AN)‐aided framework is proposed for multi‐input multioutput (MIMO) nonorthogonal multiple‐access (NOMA) systems. We guarantee resource allocation in a multicluster paradigm with simultaneous wireless power and information transfer (SWIPT) exploiting the power‐splitting technique. This recourse allocation is fulfilled where: (a) the energy‐harvesting receivers do not intercept the nonrelative data; while (b) decoding the relative cell‐edge user in the same cluster. We provide closed‐form solutions, as well as proposition of the controller π ∈{πα − πκ} for the case of imperfect channel estate information (CSI). Simulation results show that our proposed framework is superior to the existing work in terms of rate enhancement and energy efficiency maximization, experiencing the acceptable complexity ≈Onitalicit()italiciN24.5.

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Coordinated Beamforming for Multi-Cell MIMO-NOMA

Cited by 189 publications

References 10 publications

Dynamic Fractional Frequency Reuse Diversity Design for Intercell Interference Mitigation in Nonorthogonal Multiple Access Multicellular Networks

Dynamic Fractional Frequency Reuse Diversity Design for Intercell Interference Mitigation in Nonorthogonal Multiple Access Multicellular Networks

Cooperative NOMA for Downlink Asymmetric Interference Cancellation

PHY‐layer Security of MIMO‐NOMA with SWIPT

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