Coding theory: Difference between revisions

Revision as of 05:42, 27 December 2005

Revision as of 05:45, 27 December 2005

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=== Convolution codes ===

Convolutional codes are used in voiceband modems (V.32, V.17, V.34) and in GSM mobile phones., additionallyas theywell have widespread use inas satellite and military usecommunication devices.

Here the idea is to make every codeword symbol, be the weighted sum of the various, input message symbols. This is like [[convolution]] used in [[linear time invariant|LTI]] systems to find the output of a system, when you know the input and impulse response.