Analog threshold decoding

Details Analog threshold decoding Analog threshold decoding

1977-04-21

1978-12-19

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

3401461AV, G06F 1112

Patent

active

041308182

ABSTRACT:
A decoder for correcting and decoding convolutionally-coded digital data utilizes probability information. Convolutionally-coded information and parity sequences are first derived from a demodulator in analog form and then sent to analog shift registers which store the sequences. The shift registers are tapped according to the particular code, and analog multiplications of the tapped shift register outputs are then performed, with sign inversion where necessary, to produce either independent estimates of the output or independent parity checks on a single output estimate. In the former case, the estimates are then summed to a single analog output which represents a binary 1 if positive and a binary 0 if negative. In the latter case, the parity checks are summed to a single analog value which represents disagreement with the single output estimate if positive and agreement with it if negative.

REFERENCES:
patent: 3662338 (1972-05-01), Cain
patent: 3789360 (1974-01-01), Clark, Jr. et al.
patent: 4015238 (1977-03-01), Davis
Rudolph, Generalized Threshold Decoding of Convolutional Codes, IEEE Trans. on Info. Theory, vol. IT-16, No. 6, Nov. 1970, pp. 739-745.

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