| 摘要 |
PURPOSE: A method of generating data transmission signal in a demodulator of a channel modem for satellite communication system is provided to generate a data transmission signal if the error rate of I, Q data is below a predetermined rate in case of making up an error according to the error prediction of an input data and send the I, Q data to the next unit on the basis of the signal received. CONSTITUTION: In the demodulator of a channel modem for a satellite communication system which demodulates a frequency signal of a predetermined level into I, Q data and outputs them after predicting/making up an error with respect to the I, Q data, in the first step, a timing error, amplitude error and phase error generated through the satellite are detected out of the I, Q demodulated data. In the second step, errors of the I, Q data are made up on the basis of the error data detected in the first step. In the third step, out of the error data made up in the error make up step, an average error rate is calculated with respect to the I, Q data input. The error rate is compared to an error rate threshold data. In the last step, If the error rate is lower than the threshold data, a data transmission signal is generated.
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