Process for the decoding of a convolutional code and correspondi

Details Process for the decoding of a convolutional code and correspondi Process for the decoding of a convolutional code and correspondi

1986-08-01

1989-03-07

Smith, Jerry

Excavating

G06F 1110

Patent

active

048113468

ABSTRACT:
A decoding process suitable for space links decodes a sequence of symbols received from a disturbed channel resulting from the convolutional coding of a sequence of information symbols to be transmitted. The trellis of the states of the coder is defined and, as a function of the symbols received, the most likely path in the trellis is determined and this defines the most probable sequence of symbols transmitted. At each node of the trellis, the most probable path or survivor is determined by a sequence of algebraic values indicating a sequence of transmitted symbols and the likelihood of each of these symbols and by measuring the cumulative likelihood of the sequence.
In a characteristic manner, the sequence of algebraic values at a node is established by a weighted shifted transfer, each algebraic value of the sequence being a function of all the algebraic values of the same node level of the sequences of algebraic values of the antecedents of the node and being a function of the algebraic value corresponding to the transition between those antecedents and the node.

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IEEE Transactions on Communications Technology (Oct. 1971), A. J. Veterbi, "Convolutional Codes and Their Performance", pp. 751-772.

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