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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

Inactive Publication Date: 2011-02-09
GUIZHOU AEROSPACE TIANMA ELECTRICAL TECH
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Problems solved by technology

The advantage of this method is that it is simple to implement in engineering, but it also brings the disadvantages of high equipment cost, low frequency utilization rate, low signal multiplexing, low real-time data transmission, and low transmission efficiency.

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  • Universal digital dual modulation-demodulation technology in wireless communication
  • Universal digital dual modulation-demodulation technology in wireless communication
  • Universal digital dual modulation-demodulation technology in wireless communication

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Embodiment Construction

[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 implements code division after the data signal and voice signal are spread by different PN sequences at the communication signal transmitting end, and then modulated by a modulator and a demodulator respectively And demodulation, the data modulated by the modulator is combined with the voice intermediate frequency signal, and the demodulator directly samples the intermediate frequency signal to realize the synchronization of demodulation and clock tracking, recover the baseband data and input it into the main control device.

[0016] Described modem comprises complex programmable logic device CPLD, field programmable gate array device FPGA, and the working process of modem comprises two major programs of modulati...

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Abstract

The invention provides a universal digital dual modulation-demodulation technology in wireless communication. The technology comprises a scheme that: a data signal and a voice signal are subjected to spectrum spreading by different PN sequences by a communication signal transmission end, are subjected to code division, and are modulated and demodulated by a modulator and a demodulator respectively; the output data modulated by the modulator is combined with a voice medium frequency signal; the demodulator directly samples the medium frequency signal to realize synchronization of demodulation and clock tracking; and the recovered base band data are input into a master control device. The technology can meet the requirement on high real time and high transmission, and quick synchronous communication application, and has the advantages of simple structure and reliable work.

Description

(1) Technical field: [0001] The invention relates to a wireless communication modulation and demodulation technology based on software radio technology, which can be widely used in different communication application occasions through technical adaptability improvement. (2) Background technology [0002] Among the existing communication technologies, there are analog communication and digital communication. In the field of digital communication, generally data and voice are transmitted by different equipment, that is, data transmission equipment and voice transmission equipment; or are transmitted through different channels. The advantage of this method is that it is simple to implement in engineering, but it also brings the disadvantages of high equipment cost, low frequency utilization rate, low signal multiplexing, low real-time data transmission, and low transmission efficiency. [0003] In a point-to-multipoint star communication system, the wireless communication syst...

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Application Information

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IPC IPC(8): H04J3/06H04B1/707
Inventor 陈双良潘吉华马明峰
Owner GUIZHOU AEROSPACE TIANMA ELECTRICAL TECH
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