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Broadband wireless streaming to handheld terminals
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

During the last years high capacity wireless networks has started to become available to the public market. These in combination with powerful handheld terminals have increased the desire of being able to broadcast high quality multimedia in an efficient manner. The traditional multimedia systems on the market today are not designed for the new characteristics that can be found in a wireless network. These can be summarised as an increased bandwidth and terminal heterogeneity, and a higher degree of transmission errors. The thesis takes a deeper look into a few techniques, such as scalability, receiver-driven layered multicast and error propagation recovery in order to determine weather these can be used to minimise these problems. One important part when designing a wireless multimedia system is which compression standard to use. The choice has to be made with the network problems in mind and then determine if the characteristics of the compression scheme in any way can be matched against these. This has been done in the thesis, and the two standards MPEG-4 and H.263+ are most suited for wireless networks at current date. The two major advantages with these two standards are that they support many types of scalability, but also that they can make use of a wide variety of error enhancement tools. A prototype for broadcasting high quality media to handheld terminals has been implemented. The prototype uses the MPEG-1 standard, but broadcasts it in a scalable approach with help of a simple version of receiver-driven layered multicast. Tests with the system showed that both scalability and receiver-driven layered multicast can be used with good results over a wireless network. The techniques not only increased the system's tolerance against errors, it also allowed different types of terminals with varying complexity to decode the same multimedia content.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Multimedia, Wireless, Streaming, PDA, Scalable compression, Compression standards, MPEG-1, Receiver-driven Layered, Multicast
Keyword [sv]
URN: urn:nbn:se:ltu:diva-55013ISRN: LTU-EX--01/075--SELocal ID: bed1b608-8134-40de-af08-b482f366d4cbOAI: diva2:1028394
Subject / course
Student thesis, at least 30 credits
Educational program
Computer Science and Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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