Tuesday, February 7, 2012

Concatenated FEC codes for improved performance

Classical (algebraic) block codes and convolutional codes are frequently accumulated in concatenated coding schemes in which a abbreviate constraint-length Viterbi-decoded convolutional cipher does a lot of of the plan and a block cipher (usually Reed-Solomon) with beyond attribute admeasurement and block breadth "mops up" any errors fabricated by the convolutional decoder. Single canyon adaptation with this ancestors of absurdity alteration codes can crop actual low absurdity rates, but for continued ambit manual altitude (like abysmal space) accepted adaptation is recommended.

Concatenated codes accept been accepted convenance in digital and abysmal amplitude communications back Voyager 2 aboriginal acclimated the address in its 1986 appointment with Uranus. The Galileo ability acclimated accepted concatenated codes to atone for the actual top absurdity amount altitude acquired by accepting a bootless antenna.

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