Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
Neetin
User Rank
Author
re: Heinrich Hertz Institute shows broadband communication from the LED ceiling light
Neetin   8/11/2011 8:26:02 AM
NO RATINGS
Advantages of this excellent idea: 1. Visible Light (VL) sources are ubiquitous, IR devices are special 2. IR device beams are narrow-angle, LED Ceiling lights are designed to spread/diffuse light 3. IR emitters normally have lower conversion efficiency and operate at lower power levels 4. Existing VL emitters can be used Disadvantages: 1. VL receivers have to contend with far higher levels of ambient interference and saturation effects. 2. The ceiling lights would have to be ON all the time for Communications, resulting in Energy wastage, an antithesis as LEDs are aimed at Green environments 3. The light modulators would have to contend with high power levels and Mains Isolation problems which can be complex for High frequency data modulation . The Institute is talking about 500 Mbits/sec: http://www.hhi.fraunhofer.de/index.php?id=1941

DrQuine
User Rank
Author
re: Heinrich Hertz Institute shows broadband communication from the LED ceiling light
DrQuine   8/8/2011 10:45:54 PM
NO RATINGS
This sounds very similar to "Broadband access over medium and low voltage power-lines and use of white light emitting diodes for indoor communications" by P. Amirshahi and M. Kavehrad of Pennsylvania State University which was published in the IEEE Communications Society CCNC 2006 proceedings. [http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.75.3194&rep=rep1&type=pdf]

DrQuine
User Rank
Author
re: Heinrich Hertz Institute shows broadband communication from the LED ceiling light
DrQuine   8/8/2011 10:35:56 PM
NO RATINGS
Amusing that in this instance high speed communication is viable but very slow data carrier transmission rates would be problematic. Below 30 Hz, the flashing lights would become very annoying). [Also a minor linguistic note: "The optical wireless technology can be deployed in situations where wireless LAN is UNACCEPTABLE / UNDESIRABLE."]

chanj0
User Rank
Author
re: Heinrich Hertz Institute shows broadband communication from the LED ceiling light
chanj0   8/8/2011 7:18:54 PM
NO RATINGS
Is there any advantage of using visible light vs using invisible light such as infra-red?



Radio
LATEST ARCHIVED BROADCAST
As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Like Us on Facebook
Special Video Section
The LTC®6363 is a low power, low noise, fully differential ...
Vincent Ching, applications engineer at Avago Technologies, ...
The LT®6375 is a unity-gain difference amplifier which ...
The LTC®4015 is a complete synchronous buck controller/ ...
10:35
The LTC®2983 measures a wide variety of temperature sensors ...
The LTC®3886 is a dual PolyPhase DC/DC synchronous ...
The LTC®2348-18 is an 18-bit, low noise 8-channel ...
The LT®3042 is a high performance low dropout linear ...
Chwan-Jye Foo (C.J Foo), product marketing manager for ...
The LT®3752/LT3752-1 are current mode PWM controllers ...
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...