System and method for decoding tail-biting code especially appli

Details System and method for decoding tail-biting code especially appli System and method for decoding tail-biting code especially appli

1992-05-20

1994-11-29

Bocure, Tesfaldet

Pulse or digital communications

Repeaters

Testing

379 59, 371 43, H03A 100, H04L 2706

Patent

active

053696719

ABSTRACT:
A digital cellular system (10) employs a decoder that decodes control messages encoded by a convolutional tail-biting encoding procedure. The control messages (57) contain 65 bits that are encoded in a 260 bit data frame (59). The decoder reads (112) the first x quadruple bits and writes them also at the end of the data frame bit stream. A Viterbi decoding algorithm (114) is applied to the modified bit stream for x plus 65 steps. A bit stream of (65+x) bits is selected (116) from a best value path and y first bits are discarded from the selected stream. The output decoded message (118) includes bits (y+1) through (y+65).

REFERENCES:
patent: 5199031 (1993-03-01), Dahlin
"An Efficient Maximum Likelihood Decoding Algorithm for Generalized Tail Biting Convolutional Codes Including Quasicyclic Codes" by: Qiang Wang and Vijay K. Bhargava, IEEE Transactions on communications, vol. 37, No. 8, Aug. 1989.
"On Tail Biting Convolutional Codes" by Howard H. Ma, 1986 IEEE.

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