System and method for implementing modem intermediate frequency numeralization in wireless communication
A wireless communication, intermediate frequency technology, applied in the direction of frequency modulation carrier system, frequency division multiplexing system components, etc., can solve the problems of complex and difficult system design, and achieve the effect of reducing product cost and design difficulty
Active Publication Date: 2012-07-04
HYTERA COMM CORP
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
But the disadvantage is that the design of the system is complex and difficult
[0004] In view of the fact that there is no corresponding DMR product in China at present, this invention is mainly aimed at the research and development of DMR products and proposes a DMR modulation intermediate frequency digital technology that is convenient for digital realization and reduces the complexity of system design.
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0042] Such as figure 1 As shown in the figure, the interface with the Digital Signal Processor (DSP for short) completes the data exchange between the link layer and the physical layer, and the data sent by the DSP is mainly buffered through the 16-bit data bus and converted into symbols to be modulated data format, and then output with a preset symbol clock (eg 4.8KHz).
[0043] The continuous phase modulation module is one of the main modules to solve the DMR modulation algorithm, which is used to perform corresponding phase gain and accumulation according to different input levels, and perform sine and cosine amplitude transformation output respectively.
[0044] The continuous phase modulation module specifically includes a symbol data conversion module and a phase amplitude generation module (not shown in the figure). The symbol data conversion module is used to convert the input data into a symbol data format to be modulated, and output it with a preset symbol clock. ...
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
Login to View More Abstract
The invention relates to a digital system which realizes intermediate frequency modulation in wireless communication. The system comprises a continuous phase modulation module, a frequency conversion filter module, a frequency mixing module and a digital oscillator module. The continuous phase modulation module is used to accumulate corresponding phase increments according to different input level and output the accumulation result in sine and cosine forms respectively. The frequency conversion filter module is used to carry out digital frequency conversion and filtration of the two signals outputted from the sine and cosine amplitude transformation. The frequency mixing module is used to mix orthogonally the two signals outputted from the filtration. The digital oscillator module is usedto generate intermediate carriers and the two signals are modulated onto the intermediate carriers and orthogonally synthesized. As both the implementation and the algorithm of the invention adopt anintermediate frequency digitization technique, not only the difficulty in designing a RF front end is significantly reduced, but also a great deal of scene programmable gate array resources can be saved, and the cost of the product is reduced.
Description
technical field [0001] The present invention relates to modulation technology in the field of wireless communication, more specifically, to a system and method for digitalizing modulation intermediate frequency in wireless communication, which can be applied to digital mobile radio (Digital Mobile Radio, DMR for short) professional wireless communication Field and all communication products field of Continuous Phase Frequency Shift Keying (CPFSK) modulation method. Background technique [0002] The DMR wireless communication standard is a digital trunking standard recently launched by the European Communications Standards Association, and there is no corresponding product in China at present. For any wireless communication product, the realization of modulation has always been a key difficulty. The communication system stipulated in the DMR standard is a 4-level frequency shift keying (4 frequency shift keying, 4FSK for short) modulation system and also a continuous phase m...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/10H04J1/08
Inventor 马超
Owner HYTERA COMM CORP