Let be the percentage of zeros among the quantized transform coeÆcients. We discover that, in any typical video coding systems, there is always a strictly linear relationship between and the actual coding bit rate R. This linearity leads to a novel and uni ed source model for di erent types of source data and di erent coding systems, such as H.263 [1], MPEG-2 [2], and MPEG-4 [3]. The proposed l...

This article presents methods for robust and efficient communication over wireless channels. Both benefits and limitations of the classical approach of separate source and channel coding are discussed. Joint source-channel coding (JSCC) is presented as the most promising scheme for communication of analogue sources over wireless channels, due to its ability to cope with varying channel qualitie...

Very efficient still image compression methods exist today, but most of them are not fit for transmission on error prone channels. One example of state-of-the-art robust image coding is the use of wavelet compression followed by forward error correction (FEC), as proposed by Sherwood and Zeger, that gives high coding efficiency but suffers from the incomplete decoding problem. An alternative to...

Distributed video coding is a new video coding paradigm aimed at shifting the computational expensive motion estimation to the decoder. Side information is generated at the decoder as a prediction of the current frame. This creates a virtual dependency channel between the source video at the encoder and the side information at the decoder. Error correcting channel codes are used to correct the ...

We consider the problem of distributed joint source-channel coding of correlated Gaussian sources over a Gaussian Multiple Access Channel (MAC). There may be side information at the encoders and/or at the decoder. First we specialize a general result in [16] to obtain sufficient conditions for reliable transmission over a Gaussian MAC. This system does not satisfy the source channel separation....

In this correspondence, low-density parity-check (LDPC) codes are applied to lossy source coding and we study how the asymptotic performance of MacKay’s LDPC codes depends on the sparsity of the parity-check matrices in the source coding of the binary independent and identically distributed (i.i.d.) source with Pr = 1 = 0 5. In the sequel, it is shown that an LDPC code with column weight (log )...

In order to decrease fading and at the same time maintain an acceptable spectral efficiency, different cooperative schemes have been proposed for multi-source multi-relay networks. These schemes usually use the channel state information (CSI) at the transmitter side to do channel selection or relay selection to avoid deeply faded channels. A short note on the Distributed Coding Strategy, follow...