Modified Joint Channel Source Decoding structure for reliable image transmission

Author

Singh, Om Prakash ; Mitra, Abhijit ; Sinha, Rohit

Author_Institution

Dept. of Electron. & Electr. Eng., Indian Inst. of Technol., Guwahati, Guwahati, India

fYear

2012

fDate

19-20 Oct. 2012

Firstpage

1

Lastpage

5

Abstract

Transmission of images over unreliable channels is highly prone to errors. The existing Turbo code based Joint Channel Source Decoding (JCSD) uses weighting operation on the extrinsic information passed between the maximum a posteriori probability (MAP) decoders to minimize the transmission errors. We propose a modification to the existing structure to further enhance the visual quality by minimizing the transmission errors. In the modified structure, the weighting operation is applied on the channel soft output values instead of extrinsic information. Also, a low complexity error detection algorithm based on variance/ standard deviation and channel soft output value is proposed. Simulation results show the Peak Signal to Noise Ratio (PSNR) improvement of about 0.8-1.0 dB over existing JCSD approach for a low channel SNR value of 1dB.

Keywords

decoding; error detection; signal processing; source coding; turbo codes; visual communication; Turbo code; channel soft output values; joint channel source decoding structure; low channel SNR value; low complexity error detection algorithm; maximum a posteriori probability decoder; peak signal to noise ratio; reliable image transmission; transmission errors; unreliable channel; visual quality; weighting operation; Equations;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication, Information & Computing Technology (ICCICT), 2012 International Conference on

Conference_Location

Mumbai

Print_ISBN

978-1-4577-2077-2

Type

conf

DOI

10.1109/ICCICT.2012.6398157

Filename

6398157