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Old March 26th 09, 01:47 AM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Mar 2007
Posts: 801
Default Noise figure paradox


The "Turbo" codes are achievable in silicon with moderate effort.


And the payment of a suitable fee to the folks who OWN the turbo codes
at France Telecom
http://www.francetelecom.com/en_EN/i...y/turbo_codes/
http://www.spectralicensing.com/licfaq.htm


Note also that turbo and LDPC are really suited to longer block lengths
(1000 bits and bigger). For small block lengths, codes like Hamming
might be better.

Reed-Solomon combined with Viterbi decoders of convolutional codes are
also popular.

Note that in deep space, at a bit rate of 8 bps, you might not want to
use a code with a 1000 bit codeblock..

A
work going back a dozen years or more can be found at:
http://sss-mag.com/G3RUH/index2.html
(consult the adjoining pages for fuller discussion)

73's
Richard Clark, KB7QHC

 
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