Method for detecting transmission rate of code division multiple access (CDMA) type communication terminals

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).