Distributed Coding and Transmission Scheme for Wireless Communication of Satellite Images

In this chapter, we propose a novel coding and transmission scheme for satellite images broadcasting. First, we use a 2D-DWT to divide full-size satellite image band into four sub-bands; three of them are the details and a small version of image band in LL sub-band. Second, our scheme utilizes coset coding based on distributed source coding (DSC) for the LL sub-band to achieve high compression efficiency and a low encoding complexity. After that, without syndrome coding, the transmission power is directly allocated to band details and coset values according to their distributions and magnitudes without forward error correction (FEC). Finally, these data are transformed by Hadamard matrix and transmitted over a dense constellation. Experiments on satellite images demonstrate that the proposed scheme improve the average image quality by 2.28 dB, 2.83 dB and 3.66 dB over LineCast, SoftCast-3D and SoftCast-2D, respectively, and it achieves up to 6.26 dB gain over JPEG2000 with FEC.

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