Turbo-coded transmission of smoothed H.263 video for the cdma2000 downlink

TitleTurbo-coded transmission of smoothed H.263 video for the cdma2000 downlink
Publication TypeConference Paper
Year of Publication2002
AuthorsIskander, C. - D., and P. T. Mathiopoulos
Conference NameSignals, Systems and Computers, 2002. Conference Record of the 36th Asilomar Conference on
Pagination1325 - 1329 vol.2
Date Publishednov.
Keywords3G mobile communication, BER, buffer storage, cdma2000 downlink, channel bit-error rate, code division multiple access, decoding, delays, end-to-end delay restrictions, error statistics, error-correction, H.263 codec, H.263 video bitstreams, interactive video, mobile radio, mobile users, optimization, smoothing algorithm, smoothing methods, streaming video, turbo codes, turbo coding, turbo-coded transmission, video codecs, video coding, visual communication

H.263 video bitstreams can be characterized by high peak rates, frequent rate variations, and a high sensitivity to bit errors. Moreover, many interactive/streaming video applications require a tight bound on delay. The paper evaluates the performance of H.263 video transmission on the downlink of a cdma2000 system, and examines some of the tradeoffs needed in the design of such a system in order to meet the above requirements. In order to match the variable source rate to the bandwidth available to mobile cdma2000 video users, real-time smoothing of the video stream is performed prior to transmission. This introduces a delay at the video decoder which varies with the amount of buffering. To reduce the channel bit-error rate (BER), turbo coding is employed, which is also responsible for a delay at the receiver end. Hence, a tradeoff must be achieved between the amount of smoothing and error-correction, in order to respect the total end-to-end delay restrictions. Using entire system simulations, we assess the effects of the parameters of both the smoothing algorithm and the turbo coder on the received picture quality, for a given maximum delay: this work thus presents a joint optimization of real-time smoothing and turbo coding/decoding for H.263 video applications.


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