Joint Source-Channel Coding for Wireless Image Transmission based OFDM-IDMA Systems

Abstract

The source and channel coding for wireless data transmission can reduce
distortion, complexity and delay in multimedia services. In this paper, a joint sourcechannel
coding is proposed for orthogonal frequency division multiplexing -
interleave division multiple access (OFDM-IDMA) systems to transmit the
compressed images over noisy channels. OFDM-IDMA combines advantages of
both OFDM and IDMA, where OFDM removes inter symbol interference (ISI)
problems and IDMA removes multiple access interference (MAI). Convolutional
coding is used as a channel coding, while the hybrid compression method is used as
a source coding scheme. The hybrid compression scheme is based on wavelet
transform, bit plane slicing, polynomial approximation model and absolute moment
block truncation. The wavelet transform is exploited to decompose the image into
approximation and detail sub bands, while the polynomial model is used to code the
approximation image band. Simulation results show that the proposed system
reduces distortion efficiently (i.e., preserving image quality) and achieves a simple
method for image multiuser transmission over wireless channels.