Reliability-weighted analog threshold decoder

Details Reliability-weighted analog threshold decoder Reliability-weighted analog threshold decoder

1980-06-26

1982-03-30

Atkinson, Charles E.

Excavating

371 37, G06F 1110

Patent

active

043228488

ABSTRACT:
Reliability weighting is provided in the input and/or feedback paths of an analog threshold decoder to achieve additional coding gain. Examples of the reliability weighting function for a bipolar signalling system (.+-.A volts), a receive voltage v and Gaussian noise having a variance .sigma..sup.2 are R=tanh (vA/.sigma..sup.2), R=tanh (1.6 v/A), and a linear transformation having voltage clamps at .+-.1 volt. In the latter case, the gain of the linear transformation in the feedback weighting function may be n times that of the input weighting function, where n is the number of estimates involves in the output.

REFERENCES:
patent: 3789360 (1974-01-01), Clark, Jr. et al.
patent: 4015238 (1977-03-01), Davis
patent: 4087787 (1978-05-01), Acampora
patent: 4130818 (1978-12-01), Snyder, Jr.
L. D. Rudolph, Generalized Threshold Decoding of Convolutional Codes, IEEE Transaction on Information Theory, vol. IT-16, No. 6, Nov. 1970, pp. 739-745.
W. W. Wu, New Convolutional Codes, Part II, IEEE Transactions on Communications, vol. Comp24, No. 1, Jan. 1976, pp. 19-32.

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