CN108512571B - Frequency hopping signal generating device - Google Patents
Frequency hopping signal generating device Download PDFInfo
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- CN108512571B CN108512571B CN201810149987.1A CN201810149987A CN108512571B CN 108512571 B CN108512571 B CN 108512571B CN 201810149987 A CN201810149987 A CN 201810149987A CN 108512571 B CN108512571 B CN 108512571B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The present invention provides a frequency hopping signal generating apparatus, comprising: the device comprises an information source generating module, a signal modulation module and a frequency hopping modulation module; the signal source generating module generates a signal source and sends the signal source to the signal modulating module; the signal modulation module receives the information source, mixes the information source with waveform data, modulates the mixed data to obtain a modulation signal, and sends the modulation signal to the frequency hopping modulation module, and the signal modulation module enhances the robustness of the modulation signal; the frequency hopping modulation module receives the modulation signal, mixes the modulation signal with the synthesized waveform data and then modulates the mixed data to obtain a frequency hopping signal, and the frequency hopping modulation module enhances the encryption and robustness of the frequency hopping signal. The invention can generate different frequency hopping signals according to requirements.
Description
Technical Field
The present invention relates to the field of frequency hopping communications, and more particularly, to a frequency hopping signal generating apparatus.
Background
Frequency hopping communication is a communication method in which both the transmitter and the receiver change the carrier frequency to transmit information according to a specific rule. The pseudo-random code for controlling the carrier frequency is changed constantly according to a specific frequency hopping pattern, and the transmitted information can be demodulated accurately as long as the carrier of the receiving end and the carrier of the transmitting end follow the same hopping rule to realize carrier synchronization. The radio station mode of the traditional frequency hopping communication is fixed, the parameters are not easy to adjust, and the problem that expected frequency hopping signals cannot be generated flexibly according to requirements exists.
Disclosure of Invention
To overcome the above problems or to at least partially solve the above problems, the present invention provides a frequency hopping signal generating apparatus.
The frequency hopping signal generating device includes:
the device comprises an information source generating module, a signal modulation module and a frequency hopping modulation module;
the signal source generating module generates a signal source and sends the signal source to the signal modulating module; the signal modulation module receives the information source, mixes the information source with waveform data, modulates the mixed data to obtain a modulation signal, and sends the modulation signal to the frequency hopping modulation module, and the signal modulation module enhances the robustness of the modulation signal; the frequency hopping modulation module receives the modulation signal, mixes the modulation signal with the synthesized waveform data and then modulates the mixed data to obtain a frequency hopping signal, and the frequency hopping modulation module enhances the encryption and robustness of the frequency hopping signal.
The invention provides a frequency hopping signal generating device, which can generate different frequency hopping signals according to requirements by adopting a traditional ASK modulation mode, an FSK modulation mode and a BPSK modulation mode and combining a direct digital frequency synthesizer to modulate a signal source.
Drawings
Fig. 1 is a schematic diagram showing a basic configuration of a frequency hopping signal generating apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a detailed structure of a frequency hopping signal generating apparatus according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a first frequency hopping signal generated by the frequency hopping signal generating means in the embodiment of the present invention;
fig. 4 is a schematic diagram of a second frequency hopping signal generated by the frequency hopping signal generating device according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following description of the embodiments of the present invention will be further described with reference to the accompanying drawings, and specific technical details are set forth below only for better understanding of the technical solutions of the readers, and do not represent that the present invention is limited only to the following technical details.
An embodiment of the present invention provides a frequency hopping signal generating apparatus. Referring to fig. 1, fig. 1 is a schematic diagram of a basic structure of a frequency hopping signal generating apparatus according to an embodiment of the present invention, including: a signal source generating module 101, a signal modulating module 102 and a frequency hopping modulating module 103. The signal source generating module 101 generates a signal source and sends the signal source to the signal modulating module 102; the signal modulation module 102 receives the signal source, mixes the signal source with waveform data, modulates the mixed signal to obtain a modulation signal, and sends the modulation signal to the frequency hopping modulation module 103, wherein the signal modulation module 102 enhances the robustness of the modulation signal; the frequency hopping modulation module 103 receives the modulation signal, mixes the modulation signal with the synthesized waveform data, and modulates the mixed data to obtain a frequency hopping signal, and the frequency hopping modulation module 103 enhances the encryption and robustness of the frequency hopping signal.
Referring to fig. 2, fig. 2 is a schematic diagram of a specific structure of a frequency hopping signal generating apparatus according to an embodiment of the present invention, including: a source generating module 201, a signal modulating module 202, a frequency hopping modulating module 203, a control counter 204, a symbol generator 205, a modulation mode selector 206, a ROM207, a modulator 208, a frequency control word setter 209, a direct digital frequency synthesizer 210 and a frequency hopping modulator 211. The control counter 204 sends a control command to the symbol generator 205, and the symbol generator 205 generates a symbol as the source upon receiving the control command. The control counter 204 is also used to adjust the rate of the symbols to obtain symbols of different rates. The control counter 204 is further configured to adjust the number of bits of the symbol to obtain a symbol with a different number of bits, wherein the symbol is periodically repeated.
The modulation mode selector 206 sends a modulation instruction to the ROM207, and reads waveform data stored in the ROM207 according to the modulation instruction; the ROM207 sends the waveform data and the modulation instruction to the modulator 208, and the modulator 208 mixes the waveform data with the information source according to the modulation instruction and then modulates the waveform data and the information source to obtain the modulation signal. The modulation scheme of the modulator 208 includes: ASK modulation mode, FSK modulation mode, or BPSK modulation mode.
The frequency control word setter 209 sets a frequency control word and passes the frequency control word to the direct digital frequency synthesizer 210; the direct digital frequency synthesizer 210 generates the synthesized waveform data according to the frequency control word and transmits the synthesized waveform data to the frequency hopping modulator 211; the frequency hopping modulator 211 performs frequency mixing modulation on the synthesized waveform data and the modulation signal to obtain the frequency hopping signal. The frequency hopping modulator 211 comprises: a multiplier that multiplies the synthesized waveform data by the modulation signal to achieve mixed frequency modulation. The synthesized waveform data has a corresponding frequency according to the frequency control word.
Referring to fig. 3, fig. 3 is a schematic diagram of a first frequency hopping signal generated by a frequency hopping signal generating device in an embodiment of the present invention, where a modulation scheme is an ASK modulation scheme, and the method includes: the code rate is a 20kHz symbol sequence 301, an ASK modulated symbol signal 302 and a generated frequency hopping signal 303. Wherein, the frequency hopping carrier waves are 2MHz, 4MHz, 8MHz and 10 MHz.
Referring to fig. 4, fig. 4 is a schematic diagram of a second frequency hopping signal generated by a frequency hopping signal generating device in an embodiment of the present invention, where the modulation mode is an FSK modulation mode, and the method includes: the code rate is a 10kHz symbol sequence 401, an FSK modulated symbol signal 402 and a generated frequency hopping signal 403. Wherein, the frequency hopping carrier waves are 5MHz, 10MHz and 15 MHz.
As can be seen from a comparison of fig. 3 and 4, the frequency hopping signal generating apparatus according to the present invention actually generates different frequency hopping signals.
All the technical features of the claims of the present invention are elaborated upon by implementing the embodiments of the present invention.
Different from the prior art, embodiments of the present invention provide a frequency hopping signal generating apparatus, which can generate different frequency hopping signals as required by using a conventional ASK modulation mode, FSK modulation mode, and BPSK modulation mode and modulating a signal source by combining a direct digital frequency synthesizer.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A frequency hopping signal generating apparatus, comprising:
the device comprises an information source generating module, a signal modulation module and a frequency hopping modulation module;
the signal source generating module is used for generating a signal source and sending the signal source to the signal modulating module;
the signal modulation module is used for receiving the information source, mixing the information source with waveform data, modulating the mixed data to obtain a modulation signal, and sending the modulation signal to the frequency hopping modulation module;
the frequency hopping modulation module is used for receiving the modulation signal, mixing the modulation signal with the synthesized waveform data and then modulating the mixed data to obtain a frequency hopping signal;
the source generation module comprises: controlling a counter and a symbol generator;
the control counter is used for sending a control instruction to the code element generator, and the code element generator generates a code element as the information source after receiving the control instruction;
the control instruction is also used for adjusting the rate of the code element to obtain code elements with different rates;
the control instruction is further used for adjusting the bit number of the code element to obtain code elements with different bit numbers;
the symbols are periodically repeated;
the signal modulation module includes:
a modulation mode selector, a ROM and a modulator;
the modulation mode selector sends a modulation instruction to the ROM, and reads the waveform data stored in the ROM according to the modulation instruction;
the ROM sends the waveform data and the modulation instruction to the modulator, and the modulator mixes the waveform data with the information source according to the modulation instruction and then modulates the waveform data and the information source to obtain a modulation signal;
the frequency hopping modulation module includes:
a frequency control word setter, a direct digital frequency synthesizer and a frequency hopping modulator;
the frequency control word setter sets a frequency control word and transmits the frequency control word to the direct digital frequency synthesizer;
the direct digital frequency synthesizer generates the synthesized waveform data according to the frequency control word and transmits the synthesized waveform data to the frequency hopping modulator;
and the frequency hopping modulator carries out frequency mixing modulation on the synthesized waveform data and the modulation signal to obtain the frequency hopping signal.
2. The apparatus of claim 1, wherein the modulation scheme of the modulator comprises:
ASK modulation mode, FSK modulation mode, or BPSK modulation mode.
3. The apparatus of claim 1, wherein the frequency hopping modulator comprises: a multiplier that multiplies the synthesized waveform data by the modulation signal to achieve mixed frequency modulation.
4. The apparatus of claim 3, wherein the synthesized waveform data has a corresponding frequency according to the frequency control word.
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| CN108512571B true CN108512571B (en) | 2020-05-12 |
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| FI105511B (en) * | 1996-10-29 | 2000-08-31 | Nokia Networks Oy | Procedure for combining multiple signals and base station |
| CN101262467B (en) * | 2008-03-03 | 2010-09-08 | 清华大学 | Realization method and realization device for digital baseband frequency spreading modulation system |
| CN101414850B (en) * | 2008-12-04 | 2012-04-25 | 哈尔滨工业大学 | Method for generating and receiving multi-scale dual-quadrature straight-extend frequency-hopping mixing signal |
| CN101807089B (en) * | 2010-04-02 | 2012-05-02 | 广西大学 | Waveform signal generator with optionally adjustable output signal offset |
| CN102857254B (en) * | 2012-09-21 | 2014-10-08 | 中国航空无线电电子研究所 | Frequency hopping communication system and base band achieving method thereof |
| US8810299B2 (en) * | 2012-10-09 | 2014-08-19 | Altera Corporation | Signal flow control through clock signal rate adjustments |
| CN105515639B (en) * | 2015-12-02 | 2018-09-25 | 中国工程物理研究院电子工程研究所 | A kind of Utility Satellite high speed signal time synchronization method |
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