what is wireless communication newsletter?

what is wireless communication newsletter?

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Key facts

  • 5G NR signaling test in sub-6 GHz (FR1) and mmWave (FR2) frequency bands
  • Modular and scalable HW-Architecture
  • Support of Stand-alone mode / Non-Stand-alone mode
  • Upgrade your existing LTE setup by R&S®CMX500 5G signaling support
  • Modern Web-Based interface for RF-, Functional-, Application- and Protocol test

Decoding vibrations:

Today’s technological workarounds to the present wireless communication issue suffer from various drawbacks. Buoys, as an example , are designed to select up sonar waves, process the info , and shoot radio signals to airborne receivers. But these can drift apart and obtain lost. Many also are required to hide large areas, making them impracticable for, say, submarine-to-surface communications.

TARF includes an underwater acoustic transmitter that sends sonar signals employing a standard acoustic speaker. The signals travel as pressure waves of various frequencies like different data bits. as an example , when the transmitter wants to send a 0, it can transmit a wave traveling at 100 hertz; for a 1, it can transmit a 200-hertz wave. When the signal hits the surface, it causes tiny ripples within the water, only a couple of micrometers tall , like those frequencies.

To achieve high data rates, the system transmits multiple frequencies at an equivalent time, building on a modulation scheme utilized in wireless communication, called orthogonal frequency-division multiplexing. This lets the researchers transmit many bits directly .

Positioned within the air above the transmitter may be a new sort of extremely-high-frequency radar that processes signals within the millimeter wave spectrum of wireless transmission, between 30 and 300 gigahertz. (That’s the band where the upcoming high-frequency 5G wireless network will operate.)

The radar, which seems like a pair of cones, transmits a radio wave that reflects off the vibrating surface and rebounds back to the radar. thanks to the way the signal collides with the surface vibrations, the signal returns with a rather modulated angle that corresponds exactly to the info bit sent by the sonar signal. A vibration on the water surface representing a 0 bit, for instance, will cause the reflected signal’s angle to vibrate at 100 hertz.

“The radar reflection goes to vary a touch bit whenever you've got any sort of displacement like on the surface of the water,” Adib says. “By learning these tiny angle changes, we will devour these variations that correspond to the sonar signal.”

Testing the waters:

The researchers took TARF through 500 test runs during a cistern and in two different swimming pools on campus.

In the tank, the radar was placed at ranges from 20 centimeters to 40 centimeters above the surface, and therefore the sonar transmitter was placed from 5 centimeters to 70 centimeters below the surface. within the pools, the radar was positioned about 30 centimeters above surface, while the transmitter was immersed about 3.5 meters below. In these experiments, the researchers also had swimmers creating waves that rose to about 16 centimeters.

In both settings, TARF was ready to accurately decode various data — like the sentence, “Hello! from underwater” — at many bits per second, almost like standard data rates for underwater communications. “Even while there have been swimmers swimming around and causing disturbances and water currents, we were ready to decode these signals quickly and accurately,” Adib says.

In waves above 16 centimeters, however, the system isn’t ready to decode signals. subsequent steps are, among other things, refining the system to figure in rougher waters. “It can affect calm days and affect certain water disturbances. But [to make it practical] we'd like this to figure on all days and every one weathers,” Adib says.

“TARF is that the first system that demonstrates that it's feasible to receive underwater acoustic transmissions from the air using radar,” says Aaron Schulman, an professor of computing and engineering at the University of California at San Diego . “I expect this new radar-acoustic technology will benefit researchers in fields that depend upon underwater acoustics (for example, marine biology), and can inspire the scientific community to research the way to make radar-acoustic links practical and robust.”

The researchers also hope that their system could eventually enable an airborne drone or plane flying across a water’s surface to constantly devour and decode the sonar signals because it zooms by.

In the wake of a series of major, damaging earthquakes in Puerto Rico, Ookla Speedtest dove into its data from before and after to urge an image of how mobile users were impacted and therefore the current status of the networks.

The fluctuations in power availability on the island had a transparent impact on connectivity.

“Natural disasters can … wreak havoc on the infrastructure that supports that connectivity, including electric power ,” noted Isla McKetta, head of content for Ookla, during a blog post on the info .. “Electricity is important to power cellular networks and not all cell sites have on-site power generators.”

After each of three major quakes of 5.8 or larger earlier this month, Ookla noticed a drop-off in test volume from embedded devices, like routers, gateways, modems, test and measurement devices and IoT devices that monitor connectivity by running a scheduled Ookla speed test. Those devices can’t run their scheduled tests when the facility is out.

Ookla’s Speedtest data found a bigger disruption after the 6.4 quake on January 7 than the 5.8 magnitude quake the day before, albeit power plants on the island were reportedly taken offline as a security precaution after the primary quake. Ookla also found that not having access to power affected devices’ battery life for variety of days afterwards — observations which it said “may appear straight-forward, [but]are important to spotlight because they illuminate the cascading connectivity challenges that communities face in times of crisis. … In places like Puerto Rico, where the facility grid remains affected by the consequences of Hurricane Maria, the consequences of additional natural disasters on critical mobile networks are often especially challenging.”

The data analysis company is offering up some access to its data from Puerto Rico to network providers and regulators for free of charge , so as to help with recovery efforts.

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