Randomly-Directional Beamforming in Millimeter-Wave Multiuser MISO Downlink

Lee, Gilwon; Sung, Youngchul; Seo, Jeong Taeg

doi:10.1109/twc.2015.2483493

Cited by 144 publications

(119 citation statements)

References 28 publications

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“…Two works considered random beamforming in mm-wave networks and used the actual antenna pattern, but only focused on the single link analysis without interference [11], [12], and adopted some asymptotic approximation in the analysis. The actual antenna pattern was adopted in [13] for evaluating the capacity of an interfered communication link.…”

Section: A Related Work and Motivationmentioning

confidence: 99%

“…Hence, for the remainder of this paper, we will focus on LOS paths, i.e., L = 1, and adopt a uniformly random single path (UR-SP) channel model that is commonly used in mm-wave network analysis [11], [12], [22], [23]. In addition, a t (ϑ x ) represents the transmit array response vector corresponding to the spatial AoD ϑ x , and it has been shown in [1,Fig.…”

Section: System Model a Network And Channel Modelsmentioning

confidence: 99%

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Coverage Analysis for Millimeter Wave Networks: The Impact of Directional Antenna Arrays

Zhang

Haenggi

et al. 2017

IEEE J. Select. Areas Commun.

208

156

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Abstract-Millimeter wave (mm-wave) communications is considered a promising technology for 5G networks. Exploiting beamforming gains with large-scale antenna arrays to combat the increased path loss at mm-wave bands is one of its defining features. However, previous works on mm-wave network analysis usually adopted oversimplified antenna patterns for tractability, which can lead to significant deviation from the performance with actual antenna patterns. In this paper, using tools from stochastic geometry, we carry out a comprehensive investigation on the impact of directional antenna arrays in mm-wave networks. We first present a general and tractable framework for coverage analysis with arbitrary distributions for interference power and arbitrary antenna patterns. It is then applied to mm-wave ad hoc and cellular networks, where two sophisticated antenna patterns with desirable accuracy and analytical tractability are proposed to approximate the actual antenna pattern. Compared with previous works, the proposed approximate antenna patterns help to obtain more insights on the role of directional antenna arrays in mm-wave networks. In particular, it is shown that the coverage probabilities of both types of networks increase as a non-decreasing concave function with the antenna array size. The analytical results are verified to be effective and reliable through simulations, and numerical results also show that largescale antenna arrays are required for satisfactory coverage in mm-wave networks.

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Section: A Related Work and Motivationmentioning

confidence: 99%

Section: System Model a Network And Channel Modelsmentioning

confidence: 99%

Coverage Analysis for Millimeter Wave Networks: The Impact of Directional Antenna Arrays

Zhang

Haenggi

et al. 2017

IEEE J. Select. Areas Commun.

208

156

View full text Add to dashboard Cite

show abstract

“…Hence, h k can be accurately modeled as [28][29][30] where β k and β k,l are the complex gain of LoS path and multi-path components for the k-th user, respectively, i.e.,…”

Section: Channel Modelmentioning

confidence: 99%

Spectral efficiency of multi-user millimeter wave systems under single path with uniform rectangular arrays

Tan

Jin

Wen

et al. 2017

J Wireless Com Network

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In this paper, we investigate the downlink achievable ergodic spectral efficiency (SE) of a single-cell multi-user millimeter wave system, in which a uniform rectangular array is used at the base station (BS) to serve multiple single-antenna users. We adopt a three-dimensional channel model by considering both the azimuth and elevation dimensions under single-path propagation. We derive the achievable ergodic SE for this system in with maximum ratio transmission precoding. This analytical expression enables the accurate and quantitative evaluation of the effect of the number of BS antennas, signal-to-noise ratio (SNR), and the crosstalk (squared inner product between different steering vectors) which is a function of the angles of departure (AoD) of users and the inter-antenna spacing. Results show that the achievable ergodic SE logarithmically increases with the number of BS antennas and converges to a value in the high SNR regime. To improve the achievable ergodic SE, we also propose a user scheduling scheme based on feedback of users' AoD information and obtain the maximum achievable ergodic SE. Furthermore, we consider a dense user scenario where every user's AoD becomes nearly identical and then derive the system's minimum achievable SE.

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“…In this section, we present numerical results for the performance of RSMA and NOMA considering a downlink mmWave network with 2 cellular-connected UAVs. We adopt the path loss model in [10], [11] with PL(x k ) = 1 + x γ k , where γ is the path loss exponent, and x k is the LoS distance between the BS and the kth UAV. We assume that the antenna array of the BS has M = 8 elements, which are placed vertically.…”

Section: Simulation Resultsmentioning

confidence: 99%

Energy Efficiency of RSMA and NOMA in Cellular-Connected mmWave UAV Networks

Rahmati

Yapıcı

Rupasinghe

et al. 2019

2019 IEEE International Conference on Communications Workshops (ICC Workshops)

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Cellular-connected unmanned aerial vehicles (UAVs) are recently getting significant attention due to various practical use cases, e.g., surveillance, data gathering, purchase delivery, among other applications. Since UAVs are low power nodes, energy and spectral efficient communication is of paramount importance. To that end, multiple access (MA) schemes can play an important role in achieving high energy efficiency and spectral efficiency. In this work, we introduce rate-splitting MA (RSMA) and non-orthogonal MA (NOMA) schemes in a cellularconnected UAV network. In particular, we investigate the energy efficiency of the RSMA and NOMA schemes in a millimeterwave (mmWave) downlink transmission scenario. Furthermore, we optimize precoding vectors of both the schemes by explicitly taking into account the 3GPP antenna propagation patterns. The numerical results for this realistic transmission scheme indicate that RSMA is superior to NOMA in terms of overall energy efficiency.

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Randomly-Directional Beamforming in Millimeter-Wave Multiuser MISO Downlink

Cited by 144 publications

References 28 publications

Coverage Analysis for Millimeter Wave Networks: The Impact of Directional Antenna Arrays

Coverage Analysis for Millimeter Wave Networks: The Impact of Directional Antenna Arrays

Spectral efficiency of multi-user millimeter wave systems under single path with uniform rectangular arrays

Energy Efficiency of RSMA and NOMA in Cellular-Connected mmWave UAV Networks

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