Water sound frequency hopping communication method for linear modulation signal modulation and demodulation
A linear frequency modulation signal, modulation and demodulation technology, applied to electrical components, transmission systems, etc., can solve the problem of fractional Fourier spectrum sampling value reduction, etc., to improve frequency band utilization, simple calculation process, and increase information transmission rate Effect
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[0051] Below in conjunction with accompanying drawing, invention is described in further detail.
[0052] figure 1 A functional block diagram of an embodiment of the invention is shown. The communication transmitter first uses the original source as the source code to obtain the compressed digital signal, and performs channel coding on the compressed digital signal. The coding can be coded by convolutional code, Turbo code, etc.
[0053] The digital signal after channel coding is modulated by 4FH-LFM modulation method, and the modulation pattern of the chirp signal of each frequency hopping group is shown in figure 2 , image 3 , the decimal information represented by each chirp signal is correspondingly marked below the pattern. The system sampling rate fs is set to 96kHz, the frequency range is 10-20kHz, the number of frequency hopping is 4, the frequency hopping pattern is sequentially increasing, the symbol width is 10ms, and the communication rate is 600bps. The bina...
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