ETRI Journal

Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Resynchronization of Modified JPEG Using a Power Allocation Scheme in a Direct Sequence CDMA System

  • Received : 2002.03.20
  • Published : 2002.10.31
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Abstract

In this paper, we discuss recovery schemes for errors occurring when image data encoded with variable length coding (VLC) is transmitted through additive white Gaussian noise (AWGN) and multiple-access interference in direct sequence code division multiple access (DS/CDMA) systems. VLC such as JPEG is so sensitive to channel errors that severe degradation in decoded images occurs even if only one or two bits have errors. This is due to the loss of synchronization at the image decoder. We propose a resynchronization scheme using a power allocation method in wireless DS/CDMA transmission. Through simulation, we know that the proposed method has a more robust resynchronization capability and higher objective and subjective quality than the conventional method.

Keywords

References

  1. ETRI J. v.23 no.3 Performance Evaluation of the Physical Layer of the DSRC Operating in 5.8 GHz Frequency Band Lee, B.S.;Yim, C.S.;Ahn, D.H.;Oh, D.K.
  2. IEEE Proc. ICASSP92 v.3 Self-Synchronizing Variable-Length Codes for Image Transmission Lam, W.M.;Reibman, A.R.
  3. IEEE Proc. Canadian Conf. on Electrical and Computer Engineering Effects of Errors and Error Recovery in Images Compressed by the JPEG Still Image Compression Standard Algorithm Petsalis, M.E.;Soeymani, M.R.;Swamy, M.N.S.
  4. IEEE Trans. on Circuits & Systems for Video Technol. v.8 no.6 Second-Order Derivative-Based Smoothness Measure for Error Concealment in DCT-Based Codecs Zhu, W.W.;Wang, Y.;Zhu, Q.F.
  5. IEEE Pacific Rim Conf. on Communications, Computers and Signal Processing Reconstruction of Missing Blocks in JPEG Picture Transmission Ancis, M.;Giusto, D.D.