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To enhance access to urban wireless networks, an international alliance created by Intel, Facebook, Nokia and other companies has come up with the idea of deploying Wi-Fi through streetlights. However, finding the most suitable location for an access point is not easy. Now, a new algorithm can help telecom companies choose the best location to install infrastructure.

Street Lamp | PxHere International Telecommunications Infrastructure Project envisages installing access points on lampposts to provide public Wi-Fi through the 60GHz band (range 57 to 73GHz). This band is unlicensed, and 60GHzWi-Fi 's IEEE 802.11ay standard, released in 2021, supports bandwidth up to 8.64GHz.

A problem that can not be ignored is that oxygen absorption (oxygen absorption) will aggravate the signal attenuation, thus limiting the signal coverage of 60-GHz. Fortunately, even if the wireless link is less than 100 meters, it can work in densely populated urban areas. Then, how to prevent the signal from being affected by obstacles as much as possible is the key to setting up access points in cities.

In a new study, researchers at the National Institute of Standards and Technology (National Institute of Standards and Technology,NIST) developed a model for tracking 60 GHz signals. It uses a new algorithm to analyze the transmission path, which goes beyond the usual parameters such as signal angle and delay to cover the position of the receiver.

The scientists tested their model in downtown Boulder, installing a fixed transmitter on a lamppost and a mobile receiver on the roof of a van. They measured signals at 4-meter, 6-meter and 9-meter antenna heights, reflecting changes in lamp pole height in different cities and regions. The results are published in IEEE Antenna and Wireless Propagation KuaiBao (IEEE Antennas and Wireless Propagation Letters).

The researchers found that their model can well predict the measurement results in the real world, and its accuracy is comparable to that of more complex methods. In short, the optimal height of a Wi-Fi signal depends on the transmission frequency and antenna design. It turns out that installing the equipment at a height of about 4 meters is suitable for traditional wireless systems with omni-directional antennas, while higher positions of 6 or 9 meters are more friendly for new systems such as 5G that use higher millimeter wave frequencies (millimeter-wave frequencies) and narrow beam antennas (narrow-beam).

The NIST team is validating their channel model to evaluate the high-frequency wireless network design in Boulder, Colorado. Researcher Sung Yun Jun examines the alignment of the transmitter installed on the 6-meter-high mast with the antenna array of the receiver on the roof. NIST "at a lower height, random obstacles such as trees and vehicles hinder the signal propagation. therefore, the range of power spread is small." Jelena Senic, an electrical engineer at NIST, said, "in a higher position, the signal is less blocked-it can bounce off the building many times before losing power, so the power can spread more widely."

The researchers also conducted these tests on the NIST campus, and the results show that the model can simulate different environments such as residential areas. This means that telecom operators can deploy next-generation 5G and 6G systems at low cost, "because lampposts can be seen everywhere in urban environments." Senic said. At the same time, customers can expect a variety of new applications, such as ultra high definition video streaming and virtual reality, with data rates of thousands of megabits per second and low latency. "in addition, 60 GHz provides 14 GHz of ultra-wideband bandwidth in the license-free band." She added.

Jenic says it is too early to expect access to Wi-Fi through lampposts everywhere. The first target of this service may be the downtown area. "because the population density there is very high, the demand for wireless is very high."

reference

[1] https://spectrum.ieee.org/wi-fi

[2] S. Y. Jun et al., "Quasi-Deterministic Channel Propagation Model for 60 GHz Urban Wi-Fi Access From Light Poles," in IEEE Antennas and Wireless Propagation Letters, vol. 21, no. 8, pp. 1517-1521, Aug. 2022, doi: 10.1109/LAWP.2022.3171503.

Research team

Lead author Sung Yun Jun: RF Technology Department, National Institute of Standards and Technology (RF Technology Divisions National Institute of Standards and Technology)

Paper information

Release of the journal "IEEE Antenna and Wireless Communication KuaiBao" (IEEE Antennas and Wireless Propagation Letters)

Release date: April 29, 2022

Paper title Quasi-Deterministic Channel Propagation Model for 60 GHz Urban Wi-Fi Access From Light Poles

(DOI: https://doi.org/10.1109/LAWP.2022.3171503)

Article field 5G mobile communication, millimeter wave antenna, millimeter wave propagation, millimeter wave communication

This article comes from the official account of Wechat: I am a scientist iScientist (ID:IamaScientist), compiler: cod, editor: Jin Xiaoming, typesetting: Yin Ningliu

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