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Wireless Networks

Wifi? Make Way for Li-fi

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Wifi? Make Way for Li-fi

UK-based researchers at the Ultra-Parallel Visible Light Communications (UP-VLC) project announce a breakthrough in visible light communications (VLC), reaching data transfer speeds of 10Gbps with a system using tiny micro-LEDs.

The researchers hail from the universities of Edinburgh, St Andrews, Strathclyde, Oxford and Cambridge.

Reportedly the system transmits 3.5Gbps through each of the 3 primary colours (red, green, blue) making up white light, this increasing the amount of data the light can "carry." This makes the the basis of what the researchers call light fidelity or "li-fi," a potential low-cost alternative to radio-based wireless internet.

"If you think of a shower head separating water out into parallel streams, that's how we can make light behave," Prof Harald Haas tells the BBC.

Allowing the micro-LEDs to handle millions of light intensity changes per second is Orthogonal Frequency Divisional Multiplexing (OFDM), a dgital modulation technique making what amounts to an extremely fast on/off switch.

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Wifi Goes Under the Sea

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Wifi Goes Under the Sea

Underwater networking should move beyond cables researchers at the University of Buffalo propose as they start testing their first wireless internet modems designed for underwater use. 

Of course these are not any regular modems-- the oversized (18kg) bright yellow devices use high-pitched chrips, not radio, to push what amounts to an aquatic version of the TCP/IP networking protocol. Their use? Bringing the Internet of Things to watery realms. 

The use of acoustic signals is crucial, since while radio works poorly underwater sound waves penetrate water better with superior range.  

“A submerged wireless network will give us an unprecedented ability to collect and analyze data from our oceans in real time," lead researcher Tommaso Melodia says. “Making this information available to anyone with a smartphone or computer, especially when a tsunami or other type of disaster occurs, could help save lives.” Read more...

Wireless Network Reaches 100Gbps Record

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Wireless Network Reaches 100Gbps Record

Researchers at the Fraunhofer Institute for Applied Solid State Physics (IAF) and the Karlsruhe Instute of Technology (KIT) manage a world first-- wireless data transmission at 100Gbps.

The wifi tests use 237.5GHz signals over a distance of 20m in laboratory conditions. However the super-high frequencies involved demand clear line of sight between devices at all times.

“At a data rate of 100Gbps, it would be possible to transmit the contents of a Blu-ray disk or of 5 DVDs between 2 devices by radio within 2 seconds only,” researcher Prof. Ingmar Kallfass says.

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Selling Better Wi-Fi: It's Performance That Now Counts

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Selling Better Wi-Fi: It's Performance That Now Counts

Today's networks need to be designed for wifi capacity, not just coverage. That's one significant point Xirrus, maker of high performance wireless networks, wants to highlight using the recent Apple iOS 7 release as an example.

Most Apple iOS use wi-fi to download updates such as the iOS 7 release, and the latest update wreaked havoc on many networks (e.g., in educational institutions where the BYOD density of Apple device owners is high.)

Bruce Miller, VP product marketing at Xirrus [shown in photo], tells us “There was a 300% increase in traffic at some universities when the iOS 7 update was pushed to the public. Many wireless networks cannot handle this kind of spike -- networks were immediately and significantly impacted. IT administrators can no longer turn a blind eye to wireless demand, but must design networks to support mobile devices used in education – not all foreign devices that attempt to connect to the network, but devices carried and used legitimately by students.”

When traffic on the wireless surges to 3X-5X times normal, that's what Xirrus calls a "Flash Traffic Scenario." Read more...

Details Released on Christie Brio Wireless Room System

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Details Released on Christie Brio Wireless Room System

The Christie Brio is a totally wireless room system that allows up to five people to share their LCD or projection screens simultaneously. The output of Brio is two 2560?1600 (dual-link DVI-D — but can be converted to DisplayPort or HDMI) and stereo audio on 3.5 mm connectors. Inputs include up to two wired connections, five wireless inputs (from any resolution computer from 640?480 to 2560?1600 resolution), audio and all of it integrates support for HDCP.

Using Gigabit Ethernet, Christie’s Brio supports all major network protocols including IGMPv2, IPv4, IPv6, RTSP, SRTP, HTTP, TCP/IP and all wireless network streams are output at H.265 video at 30Hz. The five wireless devices are processed as network video streams @ 30Hz up to 20 Mbps per video stream. Read more...

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