- Radio Signal Propogation and Processing
- Compression and Data Management Techniques
This proposal describes a method to tackle wireless channel fading in multicasting live or scheduled HD video contents to end-users.
Wireless-channel fading and the loss of the integrity of transmitted data is a major problem for all wireless communication systems especially when it comes to broadcasting bandwidth-demanding video content associated with the emergence of Internet Protocol TV (IPTV) services. Channel fading can occur for a variety of reasons (eg. distance of user from base station, moving vehicle transmission, city buildings, etc.) which makes efficient multicasting a major challenge for wireless service providers. rnIn wireless video multicast, it is necessary to pick a certain transmission rate that majority of receivers in each coverage area could be able to receive the data with minimal loss. This will lead to underutilizing the capacity of the end-users with good wireless channel condition. At the same time, end-users with low wireless channel quality might still suffer of poor signal reception. In general, the transmission speed (modulation scheme) would be selected very conservatively to assure the reception of the signal by the majority of subscribers. This conservative transmission rate selection is the main cause of insufficient use of frequency spectrum and would waste a lot of service providers infrastructure capacity.rnTo address this channel quality problem, coding/decoding techniques for optimizing bandwidth utilization have been used; however the overall performance is still heavily dependent on the quality of the receiver’s wireless channel. UW researchers have developed a novel methodology that generates a proprietary coded intelligent multicast signal that combines Scalable Video Coding (SVC), Multiple Description Coding (MDC) and Superposition Coding (SPC) together to maximize the received video quality for all intended receivers, regardless of receiver channel quality status.
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Pin-Han Ho, Associate Professor, Department of ECE, UW is the Principle Investigator of the technology and has more than 6 years experience in various aspects of wireless communication such as wireless network security, cross-layer design in IEEE 802.16 networks, coded video multicasting, MAC layer scheduling & performance analysis and integration of fiber and wireless communication systems. He has strong ties to researchers in Institute for Information Industry of Taiwan.