Low Complexity Beamforming and User Selection Schemes for 5G MIMO-NOMA Systems

Chen, Chen; Cai, Wenbo; Cheng, Xiang; Yang, Liuqing; Jin, Ye

doi:10.1109/jsac.2017.2727229

Cited by 77 publications

(37 citation statements)

References 26 publications

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“…More particularly, the beamforming and spatial filtering optimization problem is usually formulated as a sum-rate maximization problem for perfect CSI scenarios. By contrast, it is typically formulated as a maximum outage probability (MMOP) minimization problem for realisitc imperfect CSI scenarios [122]. For the perfect CSI scenarios, an iterative minorization-maximization algorithm (MMA) was proposed for the efficient beamforming design of [123], where a second-order cone program (SOCP) based convex problem was solved in each iteration.…”

Section: A Power-domain Nomamentioning

confidence: 99%

“…Addition, the duality scheme concept has been introduced in [124], which can be regarded as the quasi-degraded solution [125] for the sum rate maximization problem, and a quadratic constrained quadratic programs (QCQP) convex problem should be solved. Furthermore, to realize low-complexity beamforming, a multiple-user CSI-based singular value decomposition (MU-CSI-SVD) algorithm was proposed in [122] for solving the sum rate maximization problem in idealized perfect CSI scenarios. This algorithm can be readily used for simplifying the outage probability expressions in realistic imperfect CSI scenarios.…”

Section: A Power-domain Nomamentioning

confidence: 99%

See 1 more Smart Citation

A Survey of Non-Orthogonal Multiple Access for 5G

Dai

Wang

Ding

et al. 2018

IEEE Commun. Surv. Tutorials

1,046

664

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Abstract-In the 5th generation (5G) of wireless communication systems, hitherto unprecedented requirements are expected to be satisfied. As one of the promising techniques of addressing these challenges, non-orthogonal multiple access (NOMA) has been actively investigated in recent years. In contrast to the family of conventional orthogonal multiple access (OMA) schemes, the key distinguishing feature of NOMA is to support a higher number of users than the number of orthogonal resource slots with the aid of non-orthogonal resource allocation. This may be realized by the sophisticated inter-user interference cancellation at the cost of an increased receiver complexity. In this article, we provide a comprehensive survey of the original birth, the most recent development, and the future research directions of NOMA. Specifically, the basic principle of NOMA will be introduced at first, with the comparison between NOMA and OMA especially from the perspective of information theory. Then, the prominent NOMA schemes are discussed by dividing them into two categories, namely, power-domain and code-domain NOMA. Their design principles and key features will be discussed in detail, and a systematic comparison of these NOMA schemes will be summarized in terms of their spectral efficiency, system performance, receiver complexity, etc. Finally, we will highlight a range of challenging open problems that should be solved for NOMA, along with corresponding opportunities and future research trends to address these challenges.

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Section: A Power-domain Nomamentioning

confidence: 99%

Section: A Power-domain Nomamentioning

confidence: 99%

A Survey of Non-Orthogonal Multiple Access for 5G

Dai

Wang

Ding

et al. 2018

IEEE Commun. Surv. Tutorials

1,046

664

View full text Add to dashboard Cite

show abstract

“…Furthermore, NOMA can be jointly designed with cooperative multiple point (CoMP) [9,109,110] or multipleantenna technology [41,[111][112][113]. Also, there have been some initial studies about employing NOMA in wireless power transfer network to increase the access opportunities [114][115][116].…”

Section: Joint Design With Othermentioning

confidence: 99%

Uplink Nonorthogonal Multiple Access Technologies Toward 5G: A Survey

Han

Zhao

et al. 2018

Wireless Communications and Mobile Computing

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Owing to the superior performance in spectral efficiency, connectivity, and flexibility, nonorthogonal multiple access (NOMA) is recognized as the promising access protocol and is now undergoing the standardization process in 5G. Specifically, dozens of NOMA schemes have been proposed and discussed as the candidate multiple access technologies for the future radio access networks. This paper aims to make a comprehensive overview about the promising NOMA schemes. First of all, we analyze the state-of-the-art NOMA schemes by comparing the operations applied at the transmitter. Typical multiuser detection algorithms corresponding to these NOMA schemes are then introduced. Next, we focus on grant-free NOMA, which incorporates the NOMA techniques with uplink uncoordinated access and is expected to address the massive connectivity requirement of 5G. We present the motivation of applying grant-free NOMA, as well as the typical grant-free NOMA schemes and the detection techniques. In addition, this paper discusses the implementation issues of NOMA for practical deployment. Finally, we envision the future research challenges deduced from the recently proposed NOMA technologies.

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“…To realize the requirement of the massive wireless devices connectivity in IoT networks, non-orthogonal multiple access (NOMA) technique can be as an effective candidate because it allows multiple devices to connect to the network with the same time frequency resource [4]. Furthermore, the NOMA technique has recently been included into the 3GPP long term evolution advanced (LTE-A) standard due to its enormous potential in improving the spectrum efficiency (SE) of the system [5], [6]. On the other hand, the cloud radio access network (CRAN), where the conventional base stations (BSs) with large coverage area are replaced by remote radio heads (RRHs) with low power and small coverage, has been as a promising scheme to obtain the high SE and energy efficiency (EE) for future wireless networks [7].…”

Section: Introductionmentioning

confidence: 99%

Green Communication for NOMA-Based CRAN

Hao

Chu

Zhou

et al. 2019

IEEE Internet Things J.

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Abstract-The wireless devices will rapidly growth with the application of the Internet of Thing (IoT), which results in the huge power consumption. To realize the green communication, in this paper, we study the energy efficiency (EE) problem in a non-orthogonal multiple access (NOMA)-based CRAN, where microwave and millimeter wave (mmWave) are applied in fronthaul and access links, respectively. Based on this, we formulate the power optimization problem to maximize the EE of the system subject to the fronthaul capacity and transmit power constraints. Due to the formulated problem is nonconvex, we first transform the fractional objective function into the subtractive form. After that, an algorithm containing outer and inner loops is proposed to deal with this non-convex problem. In particular, in the outer loop, the 1 -norm technique is adopted to transform the nonconvex fronthaul capacity constraint into the convex one; while in the inner loop, the weighted minimum mean square error (WMMSE) approach is applied to solve the formulated problem. Simulation results demonstrate that the proposed NOMA scheme can obtain higher EE as well as throughput in comparison with the conventional orthogonal multiple access (OMA) scheme.

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Low Complexity Beamforming and User Selection Schemes for 5G MIMO-NOMA Systems

Cited by 77 publications

References 26 publications

A Survey of Non-Orthogonal Multiple Access for 5G

A Survey of Non-Orthogonal Multiple Access for 5G

Uplink Nonorthogonal Multiple Access Technologies Toward 5G: A Survey

Green Communication for NOMA-Based CRAN

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