Wireless video communications
Wireless video communications
This thesis explores the feasibility of providing video services for mobile users. The design trade-offs of the MPEG-4 video compression standard ratified by the Moving Picture Expert Group (MPEG), as well as those of ITU-T study group's H.263 codec and the Video Coding Expert Group's (VCEG) H.264 video codec are investigated. More specifically, these two video codecs are capable of efficiently compressing video and yet achieving a remarkably high reconstructed video quality. The MPEG-4 video bitstream is subjected to a rigourous error sensitivity investigation, in order to assist in contriving various error protection schemes for wireless videophony systems.
For the sake of achieving error resilience, the source codec has to make provisions for error detection, resynchronisation and error concealment. Thus a packetisation technique invoking adaptive bit-rate control was used in conjunction with the various modulation scheme employed. A Burst-by-Burst (BbB) Adaptive Coded Modulation-Aided Joint Detection-Based CDMA (ACM-JD-CDMA) scheme has been proposed for wireless video telephony and its performance was characterised, when communicating over the third-generation UTRA system's wide-band vehicular fading channels. The coded modulation schemes invoked in our fixed modulation mode based systems are Low Density Parity Check code based Block Coded Modulation (LDPC-BCM) and Turbo Trellis Coded Modulation (TTCM). The performance of LDPC-BCM was evaluated and compared to that of TTCM in the context of the ACM-JD-CDMA system using a practical modem mode switching regime. Both schemes exhibited a similar transmission integrity, although the LDPC arrangement was capable of achieving this at a lower complexity.
We concluded our investigations with a comparative study of three sophisticated video transceivers. The MPEG-4 video codec was amalgamated with various channel coding and modulation schemes, such as an iterative parallel interference cancellation aided CDMA scheme as well as a more sophisticated space-time spreading assisted multi-carrier DS-CDMA video transceiver. Finally, a turbo-detected unequal error protection MPEG-4 video telephone system using a serially concatenated convolutional outer code, trellis coded modulation based inner code and space-time coding aided transmit diversity scheme was proposed. Our conclusion was that the latter scheme performed best, facilitating wireless video communications at a signal-to-noise ratio as low as about 4.5 dB.
University of Southampton
Chung, Jin Yee
6a32d0e8-4a31-40bf-ba60-8ba8e7f6b3cb
2004
Chung, Jin Yee
6a32d0e8-4a31-40bf-ba60-8ba8e7f6b3cb
Chung, Jin Yee
(2004)
Wireless video communications.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
This thesis explores the feasibility of providing video services for mobile users. The design trade-offs of the MPEG-4 video compression standard ratified by the Moving Picture Expert Group (MPEG), as well as those of ITU-T study group's H.263 codec and the Video Coding Expert Group's (VCEG) H.264 video codec are investigated. More specifically, these two video codecs are capable of efficiently compressing video and yet achieving a remarkably high reconstructed video quality. The MPEG-4 video bitstream is subjected to a rigourous error sensitivity investigation, in order to assist in contriving various error protection schemes for wireless videophony systems.
For the sake of achieving error resilience, the source codec has to make provisions for error detection, resynchronisation and error concealment. Thus a packetisation technique invoking adaptive bit-rate control was used in conjunction with the various modulation scheme employed. A Burst-by-Burst (BbB) Adaptive Coded Modulation-Aided Joint Detection-Based CDMA (ACM-JD-CDMA) scheme has been proposed for wireless video telephony and its performance was characterised, when communicating over the third-generation UTRA system's wide-band vehicular fading channels. The coded modulation schemes invoked in our fixed modulation mode based systems are Low Density Parity Check code based Block Coded Modulation (LDPC-BCM) and Turbo Trellis Coded Modulation (TTCM). The performance of LDPC-BCM was evaluated and compared to that of TTCM in the context of the ACM-JD-CDMA system using a practical modem mode switching regime. Both schemes exhibited a similar transmission integrity, although the LDPC arrangement was capable of achieving this at a lower complexity.
We concluded our investigations with a comparative study of three sophisticated video transceivers. The MPEG-4 video codec was amalgamated with various channel coding and modulation schemes, such as an iterative parallel interference cancellation aided CDMA scheme as well as a more sophisticated space-time spreading assisted multi-carrier DS-CDMA video transceiver. Finally, a turbo-detected unequal error protection MPEG-4 video telephone system using a serially concatenated convolutional outer code, trellis coded modulation based inner code and space-time coding aided transmit diversity scheme was proposed. Our conclusion was that the latter scheme performed best, facilitating wireless video communications at a signal-to-noise ratio as low as about 4.5 dB.
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Published date: 2004
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Local EPrints ID: 465413
URI: http://eprints.soton.ac.uk/id/eprint/465413
PURE UUID: 0bb94555-0b55-404d-9b93-8de32fed5ae2
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Date deposited: 05 Jul 2022 00:49
Last modified: 16 Mar 2024 20:09
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Author:
Jin Yee Chung
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