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Binary frequency shift keying modulation system

A frequency shift keying and modulation system technology, applied in the field of communication, can solve the problems of low spectrum utilization, poor flexibility, discontinuous modulation carrier phase, etc., and achieve the effect of continuous carrier phase and narrow occupied bandwidth

Active Publication Date: 2015-03-04
TOEC TECH
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Problems solved by technology

This modulation method is simple to implement, but because the outputs of the two signal sources are independent of each other, the phase of the modulated carrier is discontinuous, and the spectrum utilization rate is low. Moreover, since the output frequency of the signal source is fixed, changing the frequency of the modulated carrier requires replacing the signal source. Therefore, This method is less flexible and cannot meet the needs of today's product design

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  • Binary frequency shift keying modulation system
  • Binary frequency shift keying modulation system
  • Binary frequency shift keying modulation system

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Embodiment Construction

[0021] Specific implementation plan

[0022] The system will be further described below in conjunction with the drawings.

[0023] Such as figure 1 As shown, the binary frequency shift keying (2FSK) modulation system is characterized in that it is composed of an FPGA chip, a frequency synthesis chip and a low-pass filter. It adopts a direct frequency synthesis (DDS) method and uses a field programmable chip (FPGA 1) Directly connect to the frequency synthesis chip, and configure the frequency tuning word of the frequency synthesis chip by controlling the bus, and then output the binary frequency shift keying (2FSK) modulation signal through the low-pass filter;

[0024] FPGA chip adopts FPGA chip SPARTAN-6 of Xilinx Company.

[0025] The frequency synthesis chip adopts the frequency synthesis chip AD9851 of AD company.

[0026] The FPGA chip uses a 100MHz system clock, and its internal digital clock management module divides the 100MHz system clock to 30MHz, then outputs it to the freq...

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Abstract

The invention relates to a binary frequency shift keying modulation system which consists of an FPGA (field programmable gate array) chip, a frequency synthesis chip and a low-pass filter that are connected with one another. With the adoption of a DDS (direct digital synthesis) method, the FPGA chip is connected with the frequency synthesis chip directly; an FTW (frequency tuning word) of the frequency synthesis chip is configured in a control bus manner; and a 2FSK (binary frequency shift keying) modulation signal is output by the low-pass filter. According to method steps that achieve the modulation, the maximum output carrier frequency of the binary frequency shift keying modulation system depends on a reference frequency of the system; a carrier phase is continuous; a frequency offset is adjustable; the occupied bandwidth is smaller; and the binary frequency shift keying modulation system is convenient, flexible and practical, and achieves the frequency shift keying modulation of high-speed binary data.

Description

Technical field [0001] The present invention relates to communication technology, in particular to a binary frequency shift keying (2FSK) modulation system. The binary frequency shift modulation system can directly modulate binary high-speed data to a specified intermediate frequency, with adjustable frequency offset and bandwidth, and a fixed bandwidth The filter achieves frequency domain convergence. Background technique [0002] Frequency shift keying (FSK) is a digital modulation technique that uses the discrete value characteristics of digital baseband signals to key the carrier frequency to transmit information. This modulation technology is an earlier modulation method used in information transmission, which is easier to implement, and has better anti-noise and anti-fading performance, and has been widely used in modern communications. [0003] Binary frequency shift keying (2FSK) is a kind of frequency shift keying (FSK) modulation technology, which realizes the transm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/12
Inventor 燕栋吴岩磊邹建国田力赵丕扬杨松楠郝彬
Owner TOEC TECH
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