Patent ID: 6785298
Filing Date: 2004-08-31
Classification: H04B

Abstract:
A method for detecting a transmission rate in a wireless communication terminal employing a Code Division Multiple Access (CDMA) scheme, the method using a circularly repetitive sequence of candidate transmission rates and comprising the steps of:(a) in response to the reception of a current data frame in a de-interleaver from a modulator-demodulator, assigning as a current rate an initial rate from among the candidate rates; (b) decoding and encoding, at the current rate, a frame signal corresponding to said current frame; (c) comparing the decoded and encoded frame signal with a frame signal received from the modulator-demodulator to determine whether a comparison error is less than a predetermined threshold value; (d) if the comparison error is less than the predetermined threshold value, transmitting a signal indicative of said current rate to a vocoder, determining whether a subsequent frame exists in the de-interleaver, if a subsequent frame exists in the de-interleaver, returning to the step (b) using the subsequent frame as the current frame, and returning to the step (a) if a subsequent frame does not exist in the de-interleaver; and (e) if the comparison error is greater than the predetermined threshold value, substituting for said current rate a next transmission rate in said circularly repetitive sequence and returning to the step (b).