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

Amani, Navid; Glazunov, Andrés Alayón; Ivashina, Marianna; Maaskant, Rob

doi:10.1109/lcomm.2018.2871828

Cited by 11 publications

(11 citation statements)

References 8 publications

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“…The grating lobes may cause a high correlation among the channel vectors of users with a large angular separation (not co-located users). To avoid grating lobes, in [11] a maximum allowable δ, depending on the fieldof-view (FOV), is proposed, where the increase in the aperture size is minimal for wide FOVs. Increasing δ is reported beneficial in terms of spectral efficiency for a BS antenna array with a fixed number of antennas [12].…”

Section: Introductionmentioning

confidence: 99%

Uniform Linear Arrays With Optimized Inter-Element Spacing for LOS Massive MIMO

et al. 2021

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Section: Introductionmentioning

confidence: 99%

Uniform Linear Arrays With Optimized Inter-Element Spacing for LOS Massive MIMO

et al. 2021

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“…Solution: In [26] it is shown that, by employing a ULA equipped with a zero-forcing (ZF) precoder, there exists a maximum allowable d which prevents grating lobes from entering the FOV. For instance, L = 3 results in FOV = 40 • and by using [26, Eq.…”

Section: Proposed Bsa Configurationmentioning

confidence: 99%

Multi-Panel Sparse Base Station Design With Physical Antenna Effects in Massive MU-MIMO

Amani

Wymeersch

Johannsen

et al. 2020

IEEE Trans. Veh. Technol.

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A novel base station antenna (BSA) configuration is presented to mitigate degrading physical antenna effects in massive multiple-input multiple-output (MIMO) systems, while minimizing implementation complexities. Instead of using a commonly considered single antenna panel comprising of many elements covering a wide field-of-view (FOV) of 120 degrees, L tilted panels are used employing L times fewer elements and L times smaller FOV per panel. The spatial resolution of each panel is enhanced by employing sparse arrays with suppressed (grating-lobe) radiation outside its corresponding FOV. Therefore, more directive antenna elements can be deployed in each panel to compensate for the effective isotropic radiated power (EIRP) reduction. While sectorisation reduces the antenna gain variation in 120 degrees FOV, cooperation among multiple panels in downlink beamforming is seen to be capable of interpanel interference suppression for sum-rate enhancement. A network model is used as a multi-user (MU) MIMO simulator incorporating both antenna and channel effects. It is shown that when the number of base station antennas is ten times the number of users, the average downlink sum-rate in pure line-of-sight (LOS), rich and poor multipath environments is increased up to 60.2%, 23% and 11.1%, respectively, by multi-panel sparse arrays applying zero-forcing (ZF) precoding.

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“…However, in practice the number of base station antennas is limited and the propagation environment is not necessarily favourable [4], [5]. Spatial correlation among UEs has been observed as a degrading factor, which reduces the downlink sum-rate and increases the dynamic range of the power distribution across the array while linear precoders are applied [6]- [8]. Although in a LoS propagation the correlation depends on the angularseparation between UEs, the richness of scattering is a more critical parameter for the system sum-rate in a NLoS scenario [6].…”

Section: Introductionmentioning

confidence: 99%

Array Configuration Effect on the Spatial Correlation of MU-MIMO Channels in NLoS Environments

Amani

Farsaei

Gustavsson

et al. 2020

2020 14th European Conference on Antennas and Propagation (EuCAP)

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In this paper, three different base-station antenna (BSA) configurations are compared in terms of inter-user spatial correlation in a two dimensional (2D) non-line-of-sight (NLoS) environment. The three configurations are: (i) a regular uniform linear array (ULA); (ii) a periodic sparse array; and (iii) an aperiodic sparse array. Electromagnetic modeling of the NLoS channel is proposed where scatterers are considered as resonant dipoles confined in clusters of scatterers (CoSs). While the probability of facing highly correlated user-equipments (UEs) in a multiuser multiple-input multiple-output (MU-MIMO) system is decreasing as the richness of mutipath increases, the sparsity (increased inter-element spacing) is seen to be capable of reducing this probability as well. This is due to the larger spatial variations experienced by the sparse array. Moreover, the results show that further improvement can be achieved by deploying an aperiodic distribution of antenna elements into the sparse antenna aperture.

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

Cited by 11 publications

References 8 publications

Uniform Linear Arrays With Optimized Inter-Element Spacing for LOS Massive MIMO

Uniform Linear Arrays With Optimized Inter-Element Spacing for LOS Massive MIMO

Multi-Panel Sparse Base Station Design With Physical Antenna Effects in Massive MU-MIMO

Array Configuration Effect on the Spatial Correlation of MU-MIMO Channels in NLoS Environments

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