Maximum likelihood error correcting technique

Details Maximum likelihood error correcting technique Maximum likelihood error correcting technique

1982-03-05

1984-07-24

Atkinson, Charles E.

Excavating

G06F 1110

Patent

active

044621019

ABSTRACT:
A maximum likelihood error correcting technique for a digital communication in which a transmit side provides coded data with some redundancy through a convolutional coding circuit, and a receive side corrects transmission errors automatically through a maximum likelihood error correcting circuit has been improved by deleting some symbols at a transmit side to increase a coding rate close to 1, and inserting dummy symbols at a receive side into each bit position where a symbol has been deleted at a transmit side. A likelihood value for that dummy symbol inserted at a receive side for the maximum likelihood decoding is a fixed predetermined value. Thus, both a coding circuit in a transmit side and a decoding circuit in a receiving circuit have only to handle original low rate code, while keeping a coding rate in a transmission line high. Then, the codec for high rate code obtained merely by adding the simple circuits to the simple codec for low rate code provides an excellent error correcting capability compared with other conventional error correcting techniques of the same coding rate.

REFERENCES:
patent: 3373404 (1968-03-01), Webb
patent: 3805232 (1974-04-01), Allen
patent: 4291406 (1981-09-01), Bahl et al.
patent: 4404674 (1983-09-01), Rhodes
E. R. Berlekamp, Algebraic Coding Theory, McGraw Hill, Inc., 1968, pp. 334-336.
Punctured Convolutional Codes of Rate (n-1)
and Simplified Maximum Likelihood Decoding, by J. Bibb Cain, George C. Clark, Jr., and John M. Geist, in IEEE Translations on Information Theory, vol. IT-25, No. 1, Jan. 1979, pp. 97-100.

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