Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: An Integrated Source and Channel Rate Allocation Scheme for Robust Video Coding and Transmission over Wireless Channels | EURASIP Journal on Applied Signal Processing 2004 2 304-316 2004 Hindawi Publishing Corporation An Integrated Source and Channel Rate Allocation Scheme for Robust Video Coding and Transmission over Wireless Channels Jie Song Media Connectivity Division Agere Systems Holmdel NJ 07733 USA Email jiesong@ K. J. Ray Liu Electrical Computer Engineering Department University of Maryland College Park MD 20742 USA Email kjrliu@ Received 22 November 2002 Revised 3 September 2003 A new integrated framework for source and channel rate allocation is presented for video coding and transmission over wireless channels without feedback channels available. For a fixed total channel bit rate and a finite number of channel coding rates the proposed scheme can obtain the near-optimal source and channel coding pair and corresponding robust video coding scheme such that the expected end-to-end distortion of video signals can be minimized. With the assumption that the encoder has the stochastic information such as average SNR and Doppler frequency of the wireless channel the proposed scheme takes into account robust video coding channel coding packetization and error concealment techniques altogether. An improved method is proposed to recursively estimate the end-to-end distortion of video coding for transmission over error-prone channels. The proposed estimation is about 1-3 dB more accurate compared to the existing integer-pel-based method. Rate-distortion-optimized video coding is employed for the trade-off between coding efficiency and robustness to transmission errors. Keywords and phrases multimedia communications joint source and channel coding wireless video. 1. INTRODUCTION Multimedia applications such as video phone and video streaming will soon be available in the third generation 3G wireless systems and beyond. For these applications delay constraint makes the conventional automatic repeat request ARQ and the deep interleaver not suitable. Feedback channels
