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In this paper, we design the adaptive MAP source-controlled channel decoding for transmitting MPEG-4 images. The first order Markov model is employed for adaptively computing the source transition probabilities of the zerotree symbol sequences. Those probabilities are required at the receiver for the newly branch metric computation of the Viterbi algorithm. For analysis, we efficiently evaluate the...
We implement the convolutional interleavers into MPEG-4 image transmission systems for the Rician fading channels. The objective of this paper is to illustrate the performance differences between applying the convolutional interleavers and our previously designed random interleavers. The simulation results show some improvement on the PSNR performance of about 1.4-5 dB for the case of the slow fading...
In this work, the authors design the variable-size random interleavers for the variable length of MPEG-4 packets. In MPEG-4 source encoder, the authors divide the binary sequence of high frequency subband into the packets. To investigate the image transmission system, the authors also employ the rate 1/2 ring convolutional encoder and Rician fading channel model. For some cases, the results in PSNRs...
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...
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