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DaViD: Data Transmission Using Video Devices

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Project Description:

DaViD (Data Transmission Using Video Devices) is a novel method for optical free-space data transmission between a display acting as transmitter and a camera acting as receiver. Data is superimposed on the video playback in a way that it is not visible to spectators. With the aid of a camera – for instance one of a smartphone – the overlaid signal can be received and the transmitted data reconstructed. Due to the high number of display and camera pixel, there are a lot of potential spatial parallel transmission channels allowing high data rates despite low display and camera frame rates. Public screens for information dissemination or advertisement could be enhanced by additional content, which a smartphone user could quickly download by pointing the smartphone at the screen for a short time.  

At Communication Technology Institute, we develop all required sub-steps of the system and evaluate the functionality on different transmission paths. Several LCD TVs and computer Monitors as well as two 55 inch OLED-TV act as transmitters, while on the receiver side, two global shutter industrial cameras and various current generation smartphones are used. In addition to a Matlab-based receiver software, an app for android smartphones has been developed, allowing for mobile data decoding. In the current state, data rates of up to 23 Mbit/s have been achieved at a bit error rate of about 10-3 before error correction. Using suitable channel encoding methods, data transmission becomes quasi error free.

 

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funded by:

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Contact

M.Sc. Christian Brauers
M.Sc. Johannes Klein
M.Sc. Jianshuang Xu
M.Sc. Jörn Jochims