Wireless Technology Blog

The Wireless Technology Blog is the place for conversation and discussion about RF components, microwave systems, wireless networking anything else related to the wireless communication field. It covers industrial RF systems, and aerospace & aviation, telecommunications & entertainment, and security applications. Here, you'll find everything from application ideas, to news and industry trends, to hot topics and cutting edge innovations.

Wi-Fi Crunch? Ceiling Lights Expand Data Networks

Posted June 24, 2018 12:00 AM by Abdallah Khreishah

by Abdallah Khreishah, associate professor of electrical engineering and director of NJIT’s Optimized Networking Lab

The proliferation of mobile devices, ever-denser computer networks and the rise of the Internet of Things are changing core aspects of daily life, from commerce to communication, in profound ways. Biosensors that relay health information from patient to physician, energy management systems that monitor and regulate consumption and banking by cell phone are just a few examples.

But this steady stream of new applications, coupled with accelerating device speeds and capacity, is driving a seemingly insatiable demand for wireless bandwidth. Mobile devices have reached performance levels at which they are effectively “data starved,” since their ability to produce or consume data far exceeds the capabilities of the networks that feed them.

Electrical engineering professor Abdallah Khreishah with his graduate student, Sihua Shao, in NJIT's Optimized Networking Lab.

Visible light communications (VLC) or Li-Fi, which utilizes available indoor lights as information carriers, is emerging as an alternative, complementary technology to relieve pressure on the crowded radio frequency (RF) spectrum. The possibilities are exciting: VLC is unlicensed, has wide bandwidth, supports new levels of security due to the opacity of walls and can provide both lighting and data communications for little net increase in energy cost.

Here’s how it works: Data are delivered from overhead luminaires to receivers in the lighting field by turning the light signals generated by LEDs on and off fast enough that the photodetectors designed for information signal reception can decode the transmitted information imperceptibly to human eyes. Recent studies show data rates of up to 200 megabits per second per user can be achieved by each luminaire in a coverage area of less than 1 square meter.

Abdallah Kreishah, associate professor of electrical engineering, and his graduate student, Sihua Shao, demonstrate their Visible-Light-enhanced WiFi (Li+WiFi) technology.

But we must first resolve a few limitations, including the absence of uplinks. I developed a first practical hybrid RF-VLC system, which we’re adapting to user behavior. Our mission is to jointly optimize throughput and energy consumption, while ensuring security and seamless connectivity. Wish us luck!


Editor's note: This is a sponsored blog post from New Jersey Institute of Technology.

7 comments; last comment on 01/14/2019
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Glucose Monitor with Cloud Communications Cleared in U.S. and Europe

Posted June 03, 2017 12:00 AM by Engineering360 eNewsletter

This subscription-free glucose meter and diabetes health management system offers automatic transmission of diabetes information to a cloud-based, personalized Web portal. It's received clearance from the U.S. Food and Drug Administration (FDA) and the CE Mark in Europe.


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How Doctors Will Use Smartwatches to Increase Patient Care

Posted December 09, 2016 12:00 AM by Engineering360 eNewsletter

A new aspect of the monitoring system involves the use of smartwatches that can link to the metabolic monitors that are used with patients in intensive care. Patients' readings would be monitored in real time and stored on a central server so dangerous levels can be caught immediately, and an alert is sent directly to the doctor's wrist via Wi-Fi.


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2 comments; last comment on 12/10/2016
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Sending Messages Off-grid

Posted November 09, 2016 12:00 AM by Engineering360 eNewsletter

In the aftermath of storms like Hurricane Matthew, interrupted cellular connectivity can leave consumers cut off from communication. A new consumer network, goTenna Mesh, is an off-grid, long-range mesh network. Using point-to-point functionality, the product developers claim that the network increases range and that all communication is encrypted.


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7 comments; last comment on 11/13/2016
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Solar System Internet Debuts on Space Station

Posted September 12, 2016 12:00 AM by Engineering360 eNewsletter

NASA is taking a giant leap for mankind by creating a Solar System-wide Internet that will improve space station experiments as well as benefit earthbound environments where communications may be unreliable, such as disaster-response situations. The delay/disruption-tolerant networking (DTN) service on the International Space Station will enhance data availability. DTN stores data bundles in nodes along a communication path until those nodes can be sent to their final destination. Researchers say this differs from traditional Internet Protocols, which require all nodes in a path to be available at the same time for data transmission.


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2 comments; last comment on 09/13/2016
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