GFSK METHOD FOR SOFT DECISION DEMODULATION OF GFSK SIGNAL WITH CHANNEL CODING APPLIED AND RECEIVING APPARATUS USING THE METHOD

摘要

The present invention is a soft decision demodulation method of a GFSK signal to which channel coding is applied, comprising: extracting an average value of the magnitude of the signal; Determining a position of a valid bit by comparing the extracted average value with at least one predetermined reference value; And extracting a valid bit from the output of the frequency discriminator based on the determined location of the valid bit. According to the present invention, by using the frequency discriminator output of the GFSK signal to which channel coding is applied, the bit extraction position is varied according to the size of the received signal, and a short-length bit stream is used as the input of the Viterbi decoder, thereby preventing the distortion or information of the signal. It is possible to implement a low-definition soft decision demodulator and a receiving device while minimizing loss.