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Progressive Transmission of Images Over Fading Channels Using Rate-Compatible LDPC Codes

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3 Author(s)
Xiang Pan ; Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, Ont. ; Banihashemi, A.H. ; Cuhadar, A.

In this paper, we propose a combined source/channel coding scheme for transmission of images over fading channels. The proposed scheme employs rate-compatible low-density parity-check codes along with embedded image coders such as JPEG2000 and set partitioning in hierarchical trees (SPIHT). The assignment of channel coding rates to source packets is performed by a fast trellis-based algorithm. We examine the performance of the proposed scheme over correlated and uncorrelated Rayleigh flat-fading channels with and without side information. Simulation results for the expected peak signal-to-noise ratio of reconstructed images, which are within 1 dB of the capacity upper bound over a wide range of channel signal-to-noise ratios, show considerable improvement compared to existing results under similar conditions. We also study the sensitivity of the proposed scheme in the presence of channel estimation error at the transmitter and demonstrate that under most conditions our scheme is more robust compared to existing schemes

Published in:

Image Processing, IEEE Transactions on  (Volume:15 ,  Issue: 12 )

Date of Publication:

Dec. 2006

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