Abstract
ِAbstract Video transmission in Wideband Code Division Multiple Access (WCDMA) system has to use compression technique to overcome the channel bandwidth limitation problem. The video compression uses the Variable Length Coded (VLC,s) to obtain high compression. VLC,s is very sensitive to errors in the transmission channel . Many methods are proposed to protect the video stream. This paper proposes a new method using hybrid Discrete Wavelet Transforms (DWT) & Discrete Cosine Transform (DCT) technique to protect the more visually important VLC,s coefficients in video signal and completed by another technique to improve the performance of the video decoder decision at lower values of Signal to Interference Noise Ratio (SINR). Keywords : Video Transmission , WCDMA, Wavelet , Decoder Decision.
Highlights
Video transmission is the main application characterizing third generation (3G) and beyond mobile communication systems
This paper proposes a new method using hybrid Discrete Wavelet Transforms (DWT) & Discrete Cosine Transform (DCT) technique to protect the more visually important VLC,s coefficients in video signal and completed by another technique to improve the performance of the video decoder decision at lower values of Signal to Interference Noise Ratio (SINR)
Is2 = information bits + header information bits = 18619 + 1568 = 20187 bits 5.The Resynchronize marker is chosen with minimum length and with the condition that it is not existing in the lookup table of (VLC’s ), it is selected to be : Re.= {11111110001110111001010011001111}. 6.The Resynchronize marker locates at each ten blocks in bit stream. 7.The total number of bits after the application of the repetition code on the first stream and multiplexing the two streams is equal to 78498 bits
Summary
Video transmission is the main application characterizing third generation (3G) and beyond mobile communication systems. Multiple bit errors, which are usually due to burst channel errors or to packet loss, may lead to the loss of partial or complete video frames, causing error propagation in the temporal dimension and damage to all receiving video data [4] This propagation is a direct result of motion compensation, which is usually used to reduce video temporal redundancies[1][5]. The H.263 video coding standard adopt a method called Data Partitioning (DP) to prevent the error propagation through the VLC,s bits This method depends on partitioning the video data into different fractions of visual importance. In this paper , a new method is presented to improve the partitioning method to be more resilient against channel errors, using hybrid (DWT&DCT) technique This is done by partitioning the VLC,s into spatial parts of the original image, improving video decoder decision when high distortion image is represented
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