Based on recent works on Wyner-Ziv coding (or lossy source coding with decoder side information), we consider
the case with noisy channel and addresses distributed joint source-channel coding, while targeting at the important application of scalable video transmission over wireless networks. In Wyner-Ziv coding, after quantization,
Slepian-Wolf coding (SWC) is used to reduce the rate. SWC is traditionally realized by sending syndromes of a
linear channel code. Since syndromes of the channel code can only compress but cannot protect, for transmission
over noisy channels, additional error protection is needed. However, instead of using one channel code for SWC
and one for error protection, our idea is to use a single channel code to achieve both compression and protection.
We replace the traditional syndrome-based SWC scheme by the parity-based one, where only parity bits of the
Slepian-Wolf channel code are sent. If the amount of transmitted parity bits increases above the Slepian-Wolf
limit, the added redundancy is exploited to cope against the noise in the transmission channel. Using IRA codes
for practical parity-based SWC, we design a novel layered Wyner-Ziv video coder which is robust to channel
failures and thus very suitable for wireless communications. Our simulation results show great advantages of the
proposed solution based on joint source-channel coding compared to the traditional approach where source and
channel coding are performed separately.