Title :
MAP decoding with random interleaver for MPEG-4 image indoor wireless transmission system
Author :
Mahapakulchai, Srijidtra ; Sapasirisopon, Itsaree
Author_Institution :
Dept. of Electr. Eng., Kasetsart Univ., Bangkok
Abstract :
Here, the investigation of the performance of MAP decoding with random interleaver for MPEG-4 image transmission system is described and analyzed. The performance evaluation is shown by setting MAP decoder to match the priori statistic of zerotree symbol sequence of the ldquoLenardquo image. In this work, we successfully reduce the computation of the random interleaver process by omitting the calculation of the interleaving matrix P. In some cases, despite the computational reduction, the slight improvement of about 0.5-1 dB in PSNR can still be obtained.
Keywords :
image coding; maximum likelihood decoding; radiocommunication; statistical analysis; trees (mathematics); Lena image; MAP decoding; MPEG-4 image indoor wireless transmission system; priori statistic; random interleaver; zerotree symbol sequence; Convolution; Convolutional codes; Discrete wavelet transforms; Frequency; Image communication; MPEG 4 Standard; Maximum likelihood decoding; Quantization; Rician channels; Wavelet coefficients; MAP decoder; Random interleaver; Rician fading channels; Ring convolutional codes;
Conference_Titel :
Communications, 2008. APCC 2008. 14th Asia-Pacific Conference on
Conference_Location :
Tokyo
Print_ISBN :
978-4-88552-232-1
Electronic_ISBN :
978-4-88552-231-4
