Improvement Of Video Decoder Decision In Wcdma System Using Hybrid Dwt And Dct

AbstractVideo 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.