Patent ID: 6633601
Filing Date: 2003-10-14
Classification: H04B,H04L

Abstract:
A method of determining a frame rate of a data frame received over a variable rate communication system, wherein the method comprises:generating a plurality of decoded bit streams from demodulated soft symbols representing the data frame; re-encoding each of the decoded bit streams; correlating each of the re-encoded bit streams with the demodulated soft symbols to generate a respective correlation metric; for each of the decoded bit streams having a cyclic redundancy code, generating a frame quality indicator; determining the frame rate as a function of, at least one of the frame quality indicators, a best of the correlation metrics, and a next-best of the correlation metrics; and further determining the frame rate as a function of a plurality of predetermined threshold values each associated with a respective one of the correlation metrics, wherein each of the decoded bit streams, each of the correlation metrics, and each of the predetermined threshold values respectively corresponds to one of a plurality of data rate hypotheses comprising full rate, half rate, quarter rate, and eighth rate.