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
View PDF6 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 equipme

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04J3/06H04B1/707
Inventor 陈双良潘吉华马明峰
Owner GUIZHOU AEROSPACE TIANMA ELECTRICAL TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products