WIRELESS VIDEO TRANSMISSION
Video transmission is currently the main driver for the increase of both wired and wireless data traffic. In wired networks, movie streaming currently accounts for 50% of all internet traffic during evening hours and further growth is expected. A similar trend is observed for wireless networks. Wireless data traffic is expected to increase by a factor of 40 over the next five years, from currently 93 Petabytes to 3600 Petabytes per month. This explosive demand is fueled mainly by video traffic, which is expected to increase by a factor of 65 times, and become the by far dominant source of data traffic.
This increasing demand offers new business opportunities but also poses an enormous challenge from a technical and economical perspective. Traditional methods for increasing data throughput in wireless networks have relied on the following three approaches: (i) increase of spectrum usage, (ii) increase of the per--link spectral efficiency, and (iii) increase of spatial reuse. Increasing the amount of spectrum is limited by the fact that spectrum is a finite resource. Increasing the spectral efficiency per link is also approaching its limits: fourth--generation cellular systems such as LTE have a near--optimal physical layer, using OFDM together with capacity--approaching codes and multiple antenna elements.This leaves as the main measure the decrease of distance between transmitter and receiver, and thus the increase of the area spectral efficiency. This approach --which can be combined with increased spectrum and more efficient links --is highly scalable, and can thus provide the order--of-magnitude increase in capacity that is required for future video networks. The Achilles heel lies in the fact that every Base Station (BS) --including femto-stations --needs a high-speed backhaul
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N. Golrezai, K. Shanmugam, A. Dimakis, A. F. Molisch, G. Caire, “Wireless Video Content Delivery through Coded Distributed Caching”, IEEE ICC 2012
, in press.
N. Golrezai, K. Shanmugam, A. Dimakis, A. F. Molisch, G. Caire, “FemtoCaching: Wireless Video Content Delivery through Distributed Caching Helpers”, IEEE Infocom 2012
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