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Video-modem approach for wireless video transfer

Posted: 24 Sep 2008     Print Version  Bookmark and Share

Keywords:video-modem  video transfer  wireless HD interface  joint source channel coding 

The success of Wi-Fi and other wireless standards shows that consumers love wireless. To fit the slick design of the flat panel displays hanging on their walls, consumers wish to eliminate cumbersome wires and have flexible, easy to use and install wireless connectivity. However, existing and emerging wireless standards such as 802.11n and UWB are not capable of delivering the high video rates required for the high-quality video connectivity. Something else is needed in order to achieve the wireless counterpart of HDMI.

Wireless high quality video transfer is a tough problem. One aspect is that high video rate requires a communication channel with enough bandwidth and SNR, i.e., enough capacity. But the wireless channel is unstable and unpredictable. Its characteristics change rapidly, and due to fading and interference, its SNR and capacity vary considerably. In data transfer these problems can be compensated by using buffers and re-transmissions. This is impossible in video (and audio) connectivity where the transfer must be done in real-time with no delay and the high fidelity must be maintained throughout the transfer.

This article outlines a novel video-modem approach for wireless video transfer, based on the information theory principle of joint source channel coding (JSCC). The video-modem approach overcomes the challenges of the wireless channels for video delivery. This approach is used in Amimon's wireless HD interface (WHDI) solution which enables uncompressed wireless A/V connectivity. The WHDI solution uses a MIMO 20MHz/40MHz bandwidth channel over the 5GHz band, where MIMO provides an extra bandwidth and diversity boost to the solution. The video-modem JSCC approach can be used over other radio and frequency bands as well, enabling a robust 10x improvement compared with the traditional data-modem method for wireless video, thereby enabling wireless delivery of very high uncompressed video rates.

View the PDF document for more information.





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