System and method for decoding tail-biting code especially...

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

H - Electricity

04

B

H04B 7/26 (2006.01) H03M 13/23 (2006.01) H03M 13/41 (2006.01) H03M 13/12 (1990.01)

Patent

CA 2095368

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).

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