Gourt > Science > Math > Applications > Communication Theory > Coding Theory > Turbo Codes (2)
Turbo codes are a class of recently-developed high-performance error correction codes finding use in deep-space satellite communications and other applications where designers seek to achieve maximal information transfer over a limited-bandwidth communication link in the presence of data-corrupting noise.
The Shannon limit
Of all practical error correction methods known to date, turbo codes, together with Low-density parity-check codes, come closest to approaching the Shannon limit, the theoretical limit of maximum information transfer rate over a noisy channel.
Turbo codes make it possible to increase data rate without increasing the power of a transmission, or they can be used to decrease the amount of power used to transmit at a certain data rate. Its main drawbacks are the relative high decoding complexity and a relatively high latency, which makes it unsuitable for some applications.
- For satellite use, this is not of great concern, since the transmission distance itself introduces latency due to the limited speed of light.
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Block Turbo Codes - Ecole Nationale Superieure des Telecommunications de Bretagne.
Centre for Satellite Engineering Research, Surrey - Turbo codes research.
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FAQ on the MAP Algorithm - Maximum Aposteriori Probability Algorithm with reference to decoding of Turbo Codes.
ITR's Turbo Coding Home Page - University of South Australia's Turbo Coding Home Page.
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JPL Turbo Codes Home Page - Communications Systems and Research Section, Information Processing Group. Overview, papers, products and resources.
List of Turbo Code Sites - At the International Symposium on Turbo Codes.
Multimedia Communications Research Group - University of Southampton.
Project Turbo Code - Information Engineering, the Chinese University of Hong Kong.
Turbo Code Sites - Listed by Aaron Gulliver.
Turbo Codes - Maintained by the University of Virginia. Includes definition of the code and the future potential use. Page has resource links and bibliography.
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Turbo Codes Course - ENST 1999. Programme and course notes.
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Turbo Decoding - Using belief networks/graphical models.
Turbo/MAP Codec - A flexible hardware Turbo/MAP Codec. Detailed explanation of hardware given.
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