Title :
Design of reconfigurable random interleavers with MAP decoding for MPEG-4 image transmission system over Rician block-fading channels
Author :
Mahapakulchai, Srijidtra ; Phimsen, Nukoon
Author_Institution :
Dept. of Electr. Eng., Kasetsart Univ., Bangkok, Thailand
Abstract :
The novel design of reconfigurable random interleavers is considered here. Our objective is not only to alleviate the effect of Rician block-fading channels but also to be able to efficiently reduce the complexity of the interleavers. Again, we insert the variable length of MPEG-4 packets into the adjustable interleavers and then pass through the rate 1/2 ring convolutional channel encoder. At the receiver the priori probability of the source image is applied at MAP decoding to enhance the quality of the received image. The simulation results illustrate the improvement in PSNR up to 12 dB.
Keywords :
Rician channels; image coding; multimedia communication; MAP decoding; MPEG-4 image transmission system; Rician block-fading channels; image quality; reconfigurable random interleaves; ring convolutional channel encoder; Convolution; Convolutional codes; Demodulation; Frequency; Image communication; MPEG 4 Standard; Maximum likelihood decoding; Quantization; Rician channels; Wavelet coefficients; Block fading; MPEG-4 image; Random interleavers; Rician fading channels; Ring convolutional codes;
Conference_Titel :
Electrical Engineering/Electronics Computer Telecommunications and Information Technology (ECTI-CON), 2010 International Conference on
Conference_Location :
Chaing Mai
Print_ISBN :
978-1-4244-5606-2
Electronic_ISBN :
978-1-4244-5607-9
