Layered video transmission on adaptive OFDM wireless systems
EURASIP Journal on Applied Signal Processing
Packet video transmission over wireless channels with adaptive channel rate allocation
Journal of Visual Communication and Image Representation
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Resources allocation for the transmission of scalable images on OFDM systems
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
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This paper presents a new parallel transmission framework for reliable multimedia data transmission over spectrally shaped channels using multicarrier modulation. We propose to transmit source data layers of different perceptual importance in parallel, each occupying a number of subchannels. New loading algorithms are developed to efficiently allocate the available resources, e.g., transmitted power and bit rate, to the subchannels according to the source layers they transmit. Instead of making the bit error rate of all the subchannels equal as in most existing loading algorithms, the proposed algorithm assigns different error performance to the subchannels to achieve unequal error protection for different layers. The channel induced distortion in mean-square sense is minimized. We show that the proposed system can be applied nicely to both fixed length coding and variable-length coding. Asymptotic gains with respect to channel distortion are also derived. Numerical examples show that the proposed algorithm achieves significant performance improvement compared to the existing work, especially for spectrally shaped channels commonly used in in ADSL systems