Wireless image transmission using multiple-description-based concatenated codes
| Autor: | Anand Raghavan, Kannan Ramchandran, Daniel Grobe Sachs |
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| Rok vydání: | 2000 |
| Předmět: |
Block code
Channel code Computer science business.industry Concatenated error correction code Concatenation Data_CODINGANDINFORMATIONTHEORY Serial concatenated convolutional codes Linear code Turbo code Erasure Fading Forward error correction Low-density parity-check code Bitstream Error detection and correction Telecommunications business Computer hardware Communication channel |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.382963 |
| Popis: | This work introduces a multiple-description product code which aims at optimally generating multiple, equally-important wavelet image descriptions. The codes used are a concatenated channel code including a row (outer) code based on RCPC codes with CRC error detection and a source-channel column (inner) code consisting of the scalable SPIHT image coder and an optimized array of unequal protection Reed-Solomon erasure- correction codes. By systematically matching the unequal protection codes to the embedded source bitstream using a simple, fast optimizer that can run in real time, we allow image quality to degrade gracefully as fade worsens and maximize expected image quality at the receiver. This approach to image transmission over fading channels offers significant improvements in both peak and expected image quality when compared to current state-of-the-art techniques. Our packetization scheme is also naturally suited for hybrid packet-network/wireless channels, such as those used for wireless Internet access.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. |
| Databáze: | OpenAIRE |
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