| 摘要 |
A method for demodulating a GMSK signal and the apparatus thereof is disclosed. The apparatus is applied to a digital communication system and demodulates a GMSK signal which is received from the transmitting source. The apparatus for demodulating the GMSK signal comprises a frequency converter for converting the received GMSK signal into a baseband and separating the converted signals into the received I and Q component signals, an A-D converter for quantizing the received I and Q component signals of the baseband separated in the frequency converter and encoding the quantized I and Q component signals to generate the I and Q component receiving data, a memory where the standard waveform data with respect to the standard waveform is stored, an offset error detector for checking the correlation between the I and Q component receiving data and the standard waveform data and detecting the slot interval and the offset error, a phase locking portion for selecting the I and Q component slot data by the slot interval information and the offset error detected in the offset error detector and compensating the offset error of the selected I and Q component slot data, and a software determiner for integrating the predetermined number of data among the I and Q component slot data compensated in the phase locking portion and determining the I and Q component demodulation data according to the integrated result.
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