Universal digital dual modulation-demodulation technology in wireless communication
A wireless communication, dual modulation technology, applied in multiplex communication, time division multiplexing systems, electrical components, etc., can solve the problem of poor real-time data transmission, low frequency utilization, low signal reuse problem, to achieve the effect of simple structure, high real-time performance and high transmission rate
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[0014] The specific structure and working conditions of the present invention will be described in detail below in conjunction with drawings.
[0015] Such as figure 1 As shown, the universal digital dual modulation and demodulation technology of the present invention is to implement code division after spreading data signals and voice signals with different PN sequences at the communication signal transmitting end, and then respectively modulate them through a modulator and demodulator. And demodulation, the data outputted by the modulator and the voice intermediate frequency signal are combined, and the demodulator directly samples the intermediate frequency signal to realize the synchronization of demodulation and clock tracking, and input the main control device after the baseband data is recovered.
[0016] The modem includes a complex programmable logic device CPLD and a field programmable gate array device FPGA. The working process of the modem includes two major programs of ...
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