Symmetrical raised cosine keying and amplitude unified modulation method
A technology of joint modulation and raised cosine, applied in multi-carrier systems and other directions, can solve the problems of discontinuous change of carrier signal frequency, reduction of frequency band utilization rate of communication system, influence of audio signal reception quality, etc., to improve frequency band utilization rate and frequency band utilization. The effect of high rate and smooth frequency change
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[0029] The present invention will be described in more detail below with reference to the accompanying drawings.
[0030] figure 1 It is a block diagram of the modulation structure of the transmitting end of the present invention. The digital signal generates the SRCK signal through the SRCK modulator. The audio signal is sent to the AM (Amplitude Modulation, AM) modulator, and is moved to the corresponding frequency domain by the signal with the SRCK signal as the carrier. Finally, the modulated signal passes through a band-pass filter to form the final modulated waveform and send it out.
[0031] figure 2 It is a structural block diagram of receiving end demodulation of the present invention. The modulated signal received by the receiving end first passes through a band-pass filter to extract the in-band signal, and then sends it to the correlator and the envelope detector for processing. The local sample corresponding to correlator 1 is s 1 (t), the local sample corre...
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