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http://hdl.handle.net/1956/2552
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| Tittel: | Error detection and correction for symmetric and asymmetric channels |
| Forfattere: | Naydenova, Irina Petkova |
| Dato: | 27-Aug-2007 |
| Forlag: | The University of Bergen |
| Sammendrag: | When a message is sent over a channel errors can occur due to noise during the
transmission. So it is very important to know the error correction and detection
capability of the code, which is used to encode the message.
There are di®erent types of channels in terms of the memory. In this work
we consider channels without memory. Depending on the symbol probability,
the channels are symmetric or non-symmetric. The properties of the both types
of channels are discussed. For symmetric channels we present codes which are
good and proper for error detection. Necessary conditions for codes to be good
for error detection are derived and it is shown that large codes are proper for
error detection.
For the non-symmetric channels some optimal binary and ternary codes
which can correct up to t errors and detect all unidirectional errors are con-
structed. The method includes a generalized lower bound for the length of a
code over arbitrary alphabet size. First we make this generalization and then
we give a method which is used for the construction.
A generalization of the Bose-Lin codes, a class of codes detecting asymmetric
errors is made and the minimum weight of an undetected error is determined. |
| URI: | http://hdl.handle.net/1956/2552 |
| ISBN: | 978-82-308-0363-9 (print version) |
| Vises i samlingene: | Department of Informatics
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