Talk:Block code
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Comments originally with no section title
[edit]This was marked for speedy deletion. I doubt that it qualifies for that.
Charles Matthews 13:48, 5 Nov 2004 (UTC)
Right - it started life as a graffito, but now has content. Keep.
Charles Matthews 13:50, 5 Nov 2004 (UTC)
In the article at present it is stated that a block code is characterised by encoding the information symbols consecutively. I have doubts if that is correct. In my opinion, the main characterisation of a block code is that it is a fixed length channel code (unlike source coding schemes such as Huffman coding, and unlike channel coding methods like convolutional encoding).
In my opinion it is however possible that a block code takes a k-digit information word, and transforms this into an n-digit codeword, without there being the possibility to a symbol by symbol encoding of the information digits. Bob.v.R 11:26, 17 September 2005 (UTC)
- No answer sofar. I will now in the article make the distinction more clearly between the practical and the theoretical definition. Bob.v.R 17:42, 23 September 2005 (UTC)
Cleanup Template
[edit]This article lacks important information, and some of that it provides is incorrect. Nageh (talk) 17:33, 9 October 2009 (UTC) Particularly it needs to cover block codes in more detail, introduce linear and non-linear codes, and important theoretical bounds to block codes such as the Hammington and Singleton bounds. Nageh (talk) 17:38, 9 October 2009 (UTC)
Distance d of two Blockcodes
[edit]How is the Distance of two Blockcodes defined? What is the Distance of (2,0) and (0,0)? —Preceding unsigned comment added by 84.140.251.84 (talk) 20:34, 3 February 2010 (UTC)
Notes
[edit]- Atri Rudra, CSE545 Error Correcting Codes: Combinatorics, Algorithms and Applications, State University of New York at Buffalo.
- P Vijay Kumar, Error Correcting Codes, Available on-line, Video lectures, Lecture notes
The "Notes" section was removed: the CSE545 is not a published source, the Kumar Video and Notes links were non-responsive. Rgdboer (talk) 01:23, 11 November 2016 (UTC)
Tree code MIA
[edit]
A non-terminated convolutional encoder would be an example of a non-block (unframed) code, which has memory and is instead classified as a tree code.
Wikipedia lacks tree code. The following reference struck me as succinct:
Generally, we consider encoders which generate an output stream of codeword symbols from an input stream of data symbols. The resulting code is termed a tree code. A trellis code, which can be represented with a trellis, is a tree code with a finite-state encoder whose states depend only on a finite number of past input symbols. A trellis code that adheres to certain linearity properties is termed a convolutional code.
How about a tree code section in the trellis page, which this article could then link to? My math is a little too rusty to take this edit on myself with any surety. — MaxEnt 02:31, 17 March 2018 (UTC)