Argos

Shepard, Clayton; Yu, Hang; Anand, Narendra; Li, Erran; Marzetta, Thomas L.; Yang, Ruhua; Lin, Zhouchen

doi:10.1145/2348543.2348553

Cited by 546 publications

(18 citation statements)

References 12 publications

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“…Training in the UL, whether for UL or DL data transmission, has been well recognized as the preferred training-overhead channel-acquisition method, as a single pilot from a UT antenna allows training an unlimited number of nearby infrastructure antennas. Many works since [4] have exploited this operation to spatially multiplex large numbers of users on the same time and frequency resources and provide very large aggregate spectral-efficiencies with low overheads [6]- [9], [12], [14], [29], [30]. Section 2.1 presents an overview of massive MIMO schemes with ULpilot based channel acquisition.…”

Section: Overview Of Massive Mimomentioning

confidence: 99%

“…TDD reciprocity was enabled in [47], via a calibration technique based on exchanging pilots between the BS and UTs. An alternative calibration method, referred to as "Argos," was presented in [29] as part of an SDR implementation of a TDD reciprocity-based massive MIMO BS. A key advantage of Argos is that it does not require UT participation.…”

Section: Aspects Of Practical Implementationsmentioning

confidence: 99%

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Massive MIMO Technologies and Challenges towards 5G

Papadopoulos¹,

Wang²,

Bursalioglu³

et al. 2016

IEICE Trans. Commun.

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SUMMARY Massive MIMO is widely recognized as an essential technology for 5G. Together with newly allocated spectrum (bandwidth) and network densification (small cells), it is expected to play a key role in coping with the ongoing explosion in data-traffic demand and services. Compared to 4G MIMO technologies, massive MIMO can offer large gains in cell spectral efficiency, which, in combination with small cells and additional bandwidth, can translate into vast gains in throughput per unit area. We briefly overview the most promising TDD and FDD operation modes for massive MIMO, and discuss their potential benefits and challenges considering operation over different tiers and frequency bands. TDD operation is naturally suited to massive MIMO and can offer "massive MIMO" gains, with simple in-cell processing, low overheads and low end-to-end latencies. We also briefly describe some important massive MIMO activities towards 5G, including standardization efforts, system development and experimental trials.

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Section: Overview Of Massive Mimomentioning

confidence: 99%

Section: Aspects Of Practical Implementationsmentioning

confidence: 99%

Massive MIMO Technologies and Challenges towards 5G

Papadopoulos¹,

Wang²,

Bursalioglu³

et al. 2016

IEICE Trans. Commun.

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“…Very few implementations of massive MIMO were reported till now in the literature which has just proved the workability of the technique. A dual‐polarized 288‐element antenna array with 144 ports for massive MIMO operating at 3.7 GHz which corresponds to the lower 5G bands is presented in References and .…”

Section: Introductionmentioning

confidence: 99%

Golden angle‐inspired design of massive MIMO tapered slot array with less correlation for 5G lower band applications

Reddy

Murugan

Kumar

2019

Int J RF Microw Comput Aided Eng

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In this article, for the first time, we come up with a nature‐inspired MIMO antenna configuration that could provide less correlated wireless channels for 5G lower band (3000‐4200 MHz). Essentially, the cross‐correlation among the antenna elements is reduced by incorporating the concept of golden angle into a cylindrical configuration of tapered slot antenna array. The golden angle helps in arranging the end‐fire radiating tapered slot antennas (TSAs) in such a way that there will not be any spatial overlap among the radiation fields of the individual antenna elements. The idea is validated with 24 TSA elements placed in a cylindrical fashion. The envelope correlation coefficient (ECC) is calculated from the simulations in ANSYS HFSS and verified with measurements. The ECC value is found to be less than 0.01 in the range of 3 GHz to 4.25 GHz. The impedance matching and mutual coupling between the elements are found to be very good in the above‐mentioned frequency range from the simulations and measurements. It is believed that the application of golden angle concept to MIMO antennas would open up the windows for implementation of dense massive MIMO.

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“…Due to these degrees of freedom, higher diversity, and higher data rate can be achieved, increasing also the capacity [5][6][7]. Improvement of energy efficiency in cellular system using an increased number of antennas at the transmitter has been studied and explained in [6] (and references therein).…”

Section: Introductionmentioning

confidence: 99%

The virtual small cells based on UE positioning: a network densification solution

Santana

Lopez

Galindo-Serrano

2018

EURASIP J. Adv. Signal Process.

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Next wireless generation mobile networks will be composed of a large number of antennas at the base station (BS), which is known as massive multiple input multiple output (MIMO). Thanks to this technology, the BS can focus the energy on a user equipment (UE) or group of UEs to improve their throughput and the network capacity. We call these coverage areas virtual small cells (VSCs). Their main advantage is that they allow increasing the network capacity through a virtual densification, therefore, avoiding the deployment cost of new infrastructure. Identifying the dense traffic areas in real time and providing a good quality of service arises as a key challenge to be addressed. Our work focuses on the interaction between the VSCs and the identification of the dense traffic areas, where a feedback scheme is proposed. This feedback scheme is based on the location of these dense traffic areas provided by our proposed clustering methods. To conduct this research, we propose (i) a VSC architecture and system model with a specific codebook in order to avoid feedback overhead, and (ii) two positioning algorithms in order to determine the hotspots localization. The first positioning algorithm is based on K-means method and is centralized at the BS using Global Positioning System (GPS) coordinates, and the second one is based on cooperative communications using ultra-wideband (UWB) signals in order to avoid the network participation. Finally, simulations of these positioning methods intended for the use of the VSCs are presented. These results show significant improvement compared to already existing methods. Furthermore, these positioning methods highly reduce the feedback since, accordingly to our VSC model, the BS only requires angles information based on the localized hotspots.

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Argos

Cited by 546 publications

References 12 publications

Massive MIMO Technologies and Challenges towards 5G

Massive MIMO Technologies and Challenges towards 5G

Golden angle‐inspired design of massive MIMO tapered slot array with less correlation for 5G lower band applications

The virtual small cells based on UE positioning: a network densification solution

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