Effects of regular and aperiodic array layout in multi-user MIMO applications

Bencivenni, Carlo; Glazunov, Andrés Alayón; Maaskant, Rob; Ivashina, Marianna

doi:10.1109/apusncursinrsm.2017.8072981

Cited by 13 publications

(12 citation statements)

References 3 publications

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“…When designing the BS antennas, the application scenario and BS antenna mounting location should be taken into account, together with a meaningful link-budget [32]. Some recent works on joint channel modelling and antenna synthesis include optimisation of array layouts depending on the statistical user throughput [25,26], compact representation of propagation channels [27], investigation of a number of simultaneous BS antenna beams [28,29] and user distributions and inter-user spacings [30].…”

Section: Related Workmentioning

confidence: 99%

Trade‐offs between the quality of service, computational cost and cooling complexity in interference‐dominated multi‐user SDMA systems

et al. 2020

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The future fifth generation (5G) systems will aim to design low-cost phased array base station antenna systems at mm-waves for simultaneous multiple beamforming with enhanced spatial multiplexing, limited interference, acceptable power consumption, suitable processing complexity, and passive cooling. In this study, a multiuser space division multiple access (SDMA) model is developed to investigate the trade-off between the quality of service (QoS), computational complexity in beamforming and cooling requirements for various use cases, and a number of users. The QoS at the user ends is rated by assessing the statistical signal-to-interference-plus-noise ratios (SINRs). Two beamforming algorithms, namely conjugate beamforming (CB) and zero-forcing (ZF), are considered and compared. Depending on the deployment scenario, rotated and optimised array layouts are proposed to be used in CB with the least computational complexity while providing relatively good QoS. Different reduced-complexity ZF algorithms are introduced as a compromise between the SINR performance and computational burden. The impact of the number of simultaneously served users on the thermal management in active integrated 5G base station antenna arrays is investigated as well.

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Section: Related Workmentioning

confidence: 99%

Trade‐offs between the quality of service, computational cost and cooling complexity in interference‐dominated multi‐user SDMA systems

et al. 2020

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“…The SINR for the k th user in the downlink is given in (4). The SNR is evaluated using the link budget formulated in (5).…”

Section: T/r T/r T/r T/r T/r T/rmentioning

confidence: 99%

“…In (5), P t is the transmit power allocated to each user, G t,k is the transmit antenna gain towards the k th user, G r is the receive antenna gain of each user, L k is the propagation path loss towards the k th user, and P n is the noise floor of the receivers. Monte-Carlo simulations are performed for randomly selected users in a cell sector and the cumulative distribution function (CDF) of the SINR for all users and for all random realizations is calculated, which enables to analyze the SINR performance of all users statistically.…”

Section: T/r T/r T/r T/r T/r T/rmentioning

confidence: 99%

“…In [4], a base station antenna topology has been optimized for a statistically obtained current distribution along the aperture. Impact of array layout on the system performance has been investigated in [5], [6] in terms of average SINR and throughput. In [7], the effect of angular spacing of users on the interference-nulling performance has been investigated.…”

Section: Introductionmentioning

confidence: 99%

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System Modeling and Simulation in 5G: A Hybrid Beamforming Approach With Power Flux Equalization in the Elevation Plane

Salman

Aslan

Puskely

et al. 2019

2019 49th European Microwave Conference (EuMC)

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This paper presents a 5G downlink system model for a hybrid multiuser beamforming technique at the base station. The presented technique employs power flux equalization in the elevation plane using a fixed analog cosecant-shaped beam and digital beamforming in the azimuth plane. The system performances of various beamforming algorithms are investigated via Monte-Carlo simulations by creating simultaneous co-frequency beams towards the randomly-located users. The simulation results show that the proposed cosecant subarray hybrid beamforming statistically performs better than the state-of-the-art hybrid beamforming techniques and provides reduced complexity.

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“…design parameters affect the per-antenna power distribution when conventional ZF is adopted as a precoder [9]. This paper sheds light on how the multi-user (MU) distribution affects the power allocation of a ZF beamformed uniform linear array (ULA) in a downlink single-cell network.…”

Section: Introductionmentioning

confidence: 99%

Per-Antenna Power Distribution of a Zero-Forcing Beamformed ULA in Pure LOS MU-MIMO

et al. 2018

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An analytical model is presented to determine the perantenna power distribution of a beamformed M-element uniform linear array (ULA) as a base station antenna (BSA). The analysis assumes a single sector cell serving two user equipments (UEs) in a downlink multiuser multiple-input multiple-output (MU-MIMO) system employing zeroforcing (ZF) transmission. Determinative design parameters of the BSA configuration are identified. Afterwards, their effects on the power spread across the array are investigated when the positions of the users are random and they are uniformly distributed over the cell. It is shown that the power distribution across the ULA antenna aperture is a periodic function whose characteristics mainly depend on the angular separation of two UEs and the number of BSA antenna elements. A significant variation between ULA input powers is seen to occur if the number of elements in the ULA is smaller than one period of this power distribution function. In order to mitigate the dynamic range of the power variation across the array, an upper bound for the inter-element spacing, depending on the field-of-view (FoV) of the BSA, is defined. It is shown that, in a 20-element ULA, increasing the inter-element spacing from 0.5λ to 1.4λ reduces the power variation from 19 dB to 10 dB for differentiating two close-by UEs with 1 • angular separation.

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Effects of regular and aperiodic array layout in multi-user MIMO applications

Cited by 13 publications

References 3 publications

Trade‐offs between the quality of service, computational cost and cooling complexity in interference‐dominated multi‐user SDMA systems

Trade‐offs between the quality of service, computational cost and cooling complexity in interference‐dominated multi‐user SDMA systems

System Modeling and Simulation in 5G: A Hybrid Beamforming Approach With Power Flux Equalization in the Elevation Plane

Per-Antenna Power Distribution of a Zero-Forcing Beamformed ULA in Pure LOS MU-MIMO

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