APPARATUS AND METHOD FOR CHANNEL DECODING USING ESTIMATION OF FRAME VOCODING RATE IN CDMA SYSTEM

摘要

PURPOSE: A method of channel demodulation using voice coding rate calculation method for a CDMA wireless communication system is provided to reduce the processing time of channel demodulation by using the user's voice pattern. CONSTITUTION: In a device of calculating voice coding rate, a channel decoder(210) decodes the channel of received frames corresponding to the coding rate decided by a voice coding rate calculator(218). A channel coder(212) codes the channel of the decoded result(220) from the channel decoder(210). An error calculator(214) calculates error(222) by comparing between the decoded result(220) and the received frame. A decoding process controller(216) compares critical error(226) decided by a processor and the error(222) calculated by the error calculator(214). If the error of the decoded result(220) is smaller than the critical error(226), the decoding process controller(216) orders the channel decoder(210) to stop decoding(224) and sends to the voice coding rate calculator(218) a decoding process information(228) notifying that the received frame comes within the set error range. The voice coding rate calculator(218) calculates the coding rate of the next frame using the coding rate of the first frame.