Iterative Soft Decoding of Multiple Description Image over Wireless Channel

Saikat Majumder, Shrish Verma

Department of Electronics and Telecommunication, National Institute of Technology, Raipur, India.

DOI: 10.4236/jcc.2014.28005                

Abstract

Motivated by recent results in multiple description image coding over wireless networks, we propose a scheme for transmission of multiple descriptions through hybrid packet loss and additive white Gaussian noise channel. Each description is coded into multiple bitstreams by applying SPIHT coding on wavelet trees along spatial orientations and each stream is further compressed using arithmetic code. Use of error resilient entropy coding (EREC) is proposed in literature for synchronization requirement of variable length codes, but EREC is not compatible with iterative soft-in soft-out decoding of arithmetic code at the receiver. We propose the application of EREC assisted by state and tail bits (ERECST) in conjunction with iterative decoding of arithmetic code at receiver for reconstructing the multiple description coded image over packet loss and Gaussian noise channel. Experimental results demonstrate that an additional gain of 7 dB in PSNR is obtained over existing scheme.

Keywords

EREC, Chase-Like Decoder, Multiple Description Image Coding, Wireless Networks

Conflicts of Interest

The authors declare no conflicts of interest.

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