Patent ID: 6574289
Filing Date: 2003-06-03
Classification: H04L

Abstract:
In a variable rate communication system, a method of determining an unknown frame rate for a data frame portion of a signal, said method comprising:a) receiving said signal at said communication system; b) analyzing said data frame portion of said signal; c) choosing a potential frame rate; d) sampling a portion of said data frame at said potential frame rate to obtain received data; e) comparing said received data against apriori knowledge of transmitted data for said portion of said data frame; f) indicating a level of confidence to said communication system that said unknown frame rate is equivalent to said potential frame rate based upon a result from step (e); g) decoding said data frame at said potential frame rate with a Viterbi decoder; h) receiving a branch metric delta from said Viterbi decoder fro each bit in a tail bit portion of said data frame; and i) receiving a decoded bit from said Viterbi decoder for each bit location in said tail bit portion of said data frame.