Wireless video graphics array system design

Abstract

A novel system design to accommodate wireless computer video (WVGA) is presented. A simple, yet efficient variable threshold frame differencing scheme is developed in this paper that allows lossless computer video compression ratio's up to 100%, depending on what occurs on the screen. Using this scheme, only the differences between frames are sent through the channel. The compressed video stream still requires a very high speed wireless link. A 360 Mbps wireless OFDM link is simulated to cover a distance of 6 m in an indoor environment. The high bit rate comes at the expense of using 1/2 of the unlicensed band from 5.15-5.35 GHz (lower UNII band) per user. There is a resulting user count of 2 per 6 meter cell. However, the data rate allows a user to play full screen video files. The scheme can be modified to accommodate a higher density network of users who spend a lot of time surfing the Internet or word processing and who are not interested in viewing full screen video files all of the time.