This thesis describes several concepts associated with the transmission of multimedia services over mobile radio access networks. The error performance and traffic requirements of real-time video transmission over the General Packet Radio Services (GPRS) access network and its successor Enhanced-GPRS is examined. In view of this. video error resilience techniques which exploit channel prioritisation mechanisms are introduced with a view to increasing the robustness of received video sequences encoded with MPEG-4 to channel errors. These include stream prioritisation using unequal error protection and region-of-interest prioritisation for use in multiparty communications and streaming applications. A new forward-error correction scheme for EGPRS which uses iterative serially-concatenated convolutional-Reed Solomon codes is designed and is shown to significantly enhance the error performance for real-time services. A study of (he use of backward error correction mechanisms when transmitting streaming multimedia services is carried out, and a new retransmission scheme is introduced to increase the capacity of the radio access network when supporting streaming services
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:343461 |
| Date | January 2001 |
| Creators | Fabri, S. N. |
| Publisher | University of Surrey |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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