Localization based on angle of arrival in EM lens-focusing massive MIMO

Shaikh, Sarmad Ahmed; Tonello, Andrea M.

doi:10.1109/icce-berlin.2016.7684736

Cited by 21 publications

(12 citation statements)

References 9 publications

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“…Furthermore, the measured DoAs in degrees at various angles are provided in Figure 11. In order to validate the measured DoAs results, we have simulated the expressions in (3, 4 and 5) using Matlab by forming the received signal model in [12] with signal to noise ratio (SNR) = 10dB. The measured AoAs are in good agreement to the simulated results.…”

Section: Direction Finding Antenna Array Using the !"# ! !Hrr Couplersupporting

confidence: 55%

Performance Analysis of 180° HRR Coupler Used for Direction Finding with an Antenna Array

Shaikh

Tonello

2017

Int. J. Onl. Eng.

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Abstract-This paper presents a performance analysis of a !"# ! hybrid rat race (HRR) coupler, widely used in radio frequency (RF)/wireless communication systems to couple the power in the desired way. The !"# ! HRR ring coupler consists of 4 ports, two for the input signals and two for the output signals. In this work, the couplers have been designed and simulated at central frequencies (! ! ) of 2.4 and 10 GHz using different types of substrates. Furthermore, the coupler has been analyzed in the context of direction finding, where we combine the designed !"# ! HRR coupler with a simple two antenna elements array and we have fabricated the circuit in order to validate the performance of the coupler by estimating the direction of arrival (DoA) using the difference (!) and sum (!) ports. The measured scattering parameters and DoAs are in good agreement to the simulated results. The experimental results show that the DoA can be estimated in the range 0 to ±50 degrees with errors less than ! ! .

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Section: Direction Finding Antenna Array Using the !"# ! !Hrr Couplersupporting

confidence: 55%

Performance Analysis of 180° HRR Coupler Used for Direction Finding with an Antenna Array

Shaikh

Tonello

2017

Int. J. Onl. Eng.

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“…Generally, they consider the EM lens and traditional massive array only separately, by approximating the effect of the lens to that of a spatial discrete Fourier transform filter [8]. Other works instead have studied the lens impact by a power perspective [11], showing how it is distributed on the antennas after the EM lens focusing effect. A detailed analysis has been proposed in [7], where the lens and the massive array are jointly considered and a derivation is proposed to demonstrate the capability to collimate signals in very precise spatial directions.…”

Section: B Integration Of the Em Lens On Massive Arraysmentioning

confidence: 99%

“…More specifically, it is highlighted that the lens spatial filtering effect can be modelled with a "sinc" function, as it will be accounted for in the rest of this manuscript. Furthermore, the solution in [11] accounts for a uniform linear array, whereas in [7] the array elements are located on the focal arc of the lens, as shown in Fig. 1.…”

Section: B Integration Of the Em Lens On Massive Arraysmentioning

confidence: 99%

“…If such a solution has already been proposed and investigated [10], it still needs a dedicated effort to be fully exploited for localization [7]. In fact, despite few works have addressed the direction finding problem [11], [12], several aspects still have to be studied as, for example, the attainable fundamental angle-of-arrival (AOA) estimation performance limits.…”

Section: Introductionmentioning

confidence: 99%

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AOA Estimation with EM Lens-Embedded Massive Arrays - Invited Paper

Guidi

2018

2018 IEEE 87th Vehicular Technology Conference (VTC Spring)

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Recently, EM lens-embedded massive array antennas have been proposed for next 5G mobile wireless communications, as the adoption of a lens allows to discriminate the AOA of signals in the analog domain, with the possibility to preserve the processing complexity lower with respect to traditional massive arrays. In fact, in such a way, complex ADC chains can be avoided and the number of required antennas can be decreased. By exploiting these advantages, in this paper we study the possibility to use a single EM lens massive array at mm-wave for the AOA estimation of the received signal. In this perspective, ML estimator and practical approaches, tailored for the considered scenario, are derived. Results, obtained for different number of antennas, confirm the possibility to achieve interesting AOA estimation performance with an extremely compact architecture.

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“…However, the large scale antenna array has also brought some challenges to be tackled in order to reap the benefits of this advanced technology. For the most part, the issues revolve around the large number of hardware (RF chains) implementations and the associated computational costs, which increase the complexity and the power consumption of the system [1][2][3][4][5]. In other words, if we have 100 antennas at the system's base station (BS) then we need to activate and deactivate 100 RF chains simultaneously, where each RF chain includes a significant number of RF components such as amplifiers, mixers, analog to digital (A/D) and digital to analog (D/A) converters.…”

Section: Introductionmentioning

confidence: 99%

DoA Estimation in EM Lens Assisted Massive Antenna System Using Subsets Based Antenna Selection and High Resolution Algorithms

Shaikh¹,

Tonello²

2018

RADIOENGINEERING

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In recent times, massive antenna array technology has captured significant attention among wireless communication researchers. This is a field with strong potential to increase rates of data transfer; mitigate interference and serve a large number of users simultaneously. To contribute further to this emerging technology, this paper presents an approach for the line-of-sight (LoS) based direction of arrival (DoA) estimation using the electromagnetic (EM) lens-focusing antenna concept. The EM lens focuses the received signal energy as a function of the angle of arrival (AoA) to a small subset/area of the antenna array. This is advantageous, as it helps to reduce both hardware implementation (RF chains) and the complexity of signal processing in the large number of antennas system. Furthermore, this focusing capability of the EM lens provides additional interference rejection gain which leads to estimate the DoA of user terminals precisely. Hence, in this work, subsets based antenna selection approach and subspace-based high resolution DoA estimation algorithms have been considered in combination with the EM lens assisted massive antenna system. In simulations where the DoA is estimated with the EM lens, the results are comparable with conventional methods of DoA estimation without an EM lens, despite the significantly reduced overall system complexity.

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Localization based on angle of arrival in EM lens-focusing massive MIMO

Cited by 21 publications

References 9 publications

Performance Analysis of 180° HRR Coupler Used for Direction Finding with an Antenna Array

Performance Analysis of 180° HRR Coupler Used for Direction Finding with an Antenna Array

AOA Estimation with EM Lens-Embedded Massive Arrays - Invited Paper

DoA Estimation in EM Lens Assisted Massive Antenna System Using Subsets Based Antenna Selection and High Resolution Algorithms

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