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Title: Multimedia communication over mobile IP wireless networks
Author: Nazir, Sajid
ISNI:       0000 0004 2743 9654
Awarding Body: University of Strathclyde
Current Institution: University of Strathclyde
Date of Award: 2012
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The use of Internet Protocol (IP) based mobile wireless transmission is increasing as novel multimedia applications are being deployed. Mobile wireless channels and IP based communications are inherently prone to errors and packet losses. Error resilience features and Forward Error Correction (FEC) at the application layer (AL) are often used to protect the video data against losses. The amount of redundancy added by the FEC attempts to counter the worst channel Signal-to-noise-ratio (SNR) but the protection generally comes at a high complexity and overhead. It is thus imperative to design FEC solutions which are adaptive to the varying wireless channel conditions, i.e., bandwidth and packet loss rate. This adaptive behaviour becomes even more important for transmission to heterogeneous receivers. Fountain codes are rateless codes which can be used to potentially generate an unlimited number of encoded packets from a limited number of source packets. The decoding is possi ble if the number of received encoded packets at the receiver is just a little more than the source packets. As each portion of encoded video data does not have equal importance for the video re-construction, this characteristic can also be advantageously exploited while designing FEC solutions by providing more protection to important portions. Random linear codes (RLC) based schemes have been compared with Raptor codes, and RLC solution is proposed for the mobile television broadcasting standards like Digital Video Broadcasting-Handheld (DVB-H) and DVB-T2 (Second Generation Terrestrial). A reliable unicast video communication solution based on Luby Transform (LT) codes is proposed by exploiting unequal error protection (UEP) for encoded video data partitioned with the Data partitioning (DP) and slicing feature of H264/AVC. A comparison of layered video data transmission with Amplify-and-Forward (AF) and Decode-and-Forward (DF) relay collaboration strategies is provided. A novel scheme for multiple description coding (MDC) has been proposed and its advantages highlighted through simulations over relay based multi hop channels, like Long Term Evolution- Advanced (LTE-A). An algorithm has been proposed which takes into account the PSNR contribution and temporal significance of each slice to prioritize H.264/AVC sliced video data. The simulation results with systematic RLC show the usefulness of the proposed scheme for applications such as video-on-demand (VoD).
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral