Punctured coding system for providing unequal error protection i

Details Punctured coding system for providing unequal error protection i Punctured coding system for providing unequal error protection i

1995-10-12

1997-11-25

Baker, Stephen M.

Excavating

H03M 1300

Patent

active

056919921

ABSTRACT:
A coding system for error protecting both insignificant and significant symbols of a digital message to be transmitted from a transmitter to a receiver of a digital system. Error protection for both insignificant and significant symbols is provided by coding at the transmitter both significant and insignificant symbols of message blocks forming the digital message. The symbol rate of the coded signal to be transmitted is reduced and unequal error protection is provided to the significant symbols by puncturing a selected number of insignificant symbols of each codeword of the coded signal. At the receiver, a correction determination is made for each received codeword as to whether the erasures and errors of the received codeword are correctable. The correction determination is a function of the number of errors, number of erasures, and the minimum distance of the code. Based on this correction determination, the received codeword is depunctured and decoded.

REFERENCES:
patent: 5099482 (1992-03-01), Cameron
patent: 5197061 (1993-03-01), Halbert-Lassale et al.
patent: 5305352 (1994-04-01), Calderbank et al.
Yutaka Yasuda, Kanshiro Kashiki and Yasuo. Hirata, "High-Rate Punctured Convolutional Codes for Soft Decision Viterbi Decoding," IEEE Transactions on Communications, vol. Com-32, No. 3, Mar. 1984.
Kjell J. Hole, "An Algorithm for Determining If a Rate (n-1)
Punctured Convolutional Encoder is Catastrophic," IEEE Transactions on Communications, vol. 39, No. 3, Mar. 1991.

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