Patent ID: 6683914
Filing Date: 2004-01-27
Classification: H03M,H04L

Abstract:
A method for decoding a convolutionally encoded digital serial data flow, received in a packet transmission system, said method comprising the steps of:aâ€²) receiving a message including an encapsulation message and a packet of encoded symbols; bâ€²) discriminating said encapsulation message to generate an envelope logic signal having a first binary value prior to the start and after the end of said packet of encoded symbols and a second binary value during the reception of said packet of encoded symbols; câ€²) subjecting said envelope logic signal and said encoded symbols to a logic processing to generate: &agr;) successive pause symbols of specified value and rank for said first binary value of said envelope logic signal, and &bgr;) successive validated encoded symbols corresponding to said symbols for said second binary value of said envelope logic signal; dâ€²) subjecting said successive pause symbols and validated encoded symbols of given rank to a continuous VITERBI type decoding, whereby said pause symbols provide continuity of a decoding trellis by imposing a stable state between two successive packets of encoded symbols, wherein for a pause state and a first logic value of said envelope logic signal equal to the value 1, and for a signal representing the activity of the envelope corresponding to the second envelope logic value equal to 0, said logic processing comprises applying to each symbol an OR function with said envelope logic signal.