CN108494438A - A kind of generation method, generating means and the sending device of hybrid spread spectrum signal - Google Patents
A kind of generation method, generating means and the sending device of hybrid spread spectrum signal Download PDFInfo
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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
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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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
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
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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
- H04B2001/71362—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform using a bank of frequency sources
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Abstract
The present invention provides a kind of generation method, generating means and the sending device of hybrid spread spectrum signal.Generating means include：First spread-spectrum signal for code element information stream to be carried out Direct Sequence Spread Spectrum to generate the first spread-spectrum signal, and is carried out dipole inversion by direct expansion module；Frequency hopper module, for generating multichannel frequency-hopping carrier；Hybrid spread spectrum signal generation module is electrically connected with the direct expansion module and the frequency hopper module respectively, for according to the first spread-spectrum signal and the multichannel frequency-hopping carrier for passing through dipole inversion, generating hybrid spread spectrum signal.Generating means provided by the invention, the first spread-spectrum signal by that will pass through dipole inversion is multiplied with multichannel frequency-hopping carrier respectively, and the result after all multiplications is merged to generate the hybrid spread spectrum signal of high speed, on the basis of the advantage and Anti-jamming Performance of Frequency-hopping System of having concentrated direct-sequence communications system concealment strong strong advantage, data rate is improved.
Description
Technical Field
The present invention relates to the field of signal processing technologies, and in particular, to a method, an apparatus, and a transmitting apparatus for generating a hybrid spread spectrum signal.
Background
In modern communication, especially in modern military communication, the detection resistance, interference resistance, interception resistance and high efficiency become necessary technical characteristics of the modern military communication, for example, a LINK16 military communication data chain used in the modern united states and the north convention adopts a frequency hopping, spread spectrum and time hopping three-dimensional modulation technology to achieve the purposes of improving communication confidentiality, detection resistance and interference resistance, becomes an important information sharing common platform for the land, sea and air troops, and greatly improves the cooperative combat capability of the troops and the overall combat capability of local battles.
However, in the prior art, the same pseudorandom sequence is usually used to directly spread the information, so that when an attack is received, if an enemy knows the frequency hopping pattern used by the system, the acquired pseudorandom sequence can be used to successfully despread the information of each frequency hopping point. Therefore, the hidden danger that the system is attacked and cracked still exists in the prior art. In addition, for the transmission of spread spectrum signals, an up-converter is generally used to perform analog up-conversion on the spread spectrum signals and then transmit the spread spectrum signals in the prior art, but the use of the up-converter is high in cost, and the transmitted spread spectrum signals are easy to distort due to the problems of temperature drift and aging of an analog circuit.
Disclosure of Invention
The present invention provides a method, apparatus and transmitting apparatus for generating a hybrid spread spectrum signal that overcomes or at least partially solves the above-mentioned problems.
According to an aspect of the present invention, there is provided a hybrid spread spectrum signal generating apparatus, including:
the direct sequence spread spectrum module is used for carrying out direct sequence spread spectrum on the code element information flow to generate a first spread spectrum signal and carrying out polarity conversion on the first spread spectrum signal;
the frequency hopping module is used for generating a plurality of paths of frequency hopping carrier waves;
and the mixed spread spectrum signal generating module is respectively electrically connected with the direct spread spectrum module and the frequency hopping module and is used for generating a mixed spread spectrum signal according to the first spread spectrum signal subjected to polarity conversion and the multi-channel frequency hopping carrier wave.
According to another aspect of the present invention, there is provided a transmission apparatus of a hybrid spread spectrum signal, comprising: DAC module, difference-single end conversion module and the above mixed spread spectrum signal generating device; wherein,
the generating device of the mixed spread spectrum signal is used for generating the mixed spread spectrum signal;
the DAC module is electrically connected with the generating device of the mixed spread spectrum signal and is used for converting the mixed spread spectrum signal into a differential analog signal;
the differential-single-ended conversion module is electrically connected with the DAC module and used for converting the differential analog signal into a single-ended analog signal and sending the single-ended analog signal.
According to still another aspect of the present invention, there is provided a method for generating a hybrid spread spectrum signal, including:
performing direct sequence spread spectrum on a symbol information stream to generate a first spread spectrum signal, and performing polarity conversion on the first spread spectrum signal;
generating a plurality of paths of frequency hopping carrier waves;
and generating a mixed spread spectrum signal according to the first spread spectrum signal subjected to polarity conversion and the multipath frequency hopping carrier waves.
According to the generation method, the generation device and the sending device of the hybrid spread spectrum signal, the first spread spectrum signal subjected to polarity conversion is multiplied by the multiple paths of frequency hopping carriers respectively, and all multiplied results are combined to generate the high-speed hybrid spread spectrum signal, so that the sampling rate of the transmitted data is improved on the basis of integrating the advantages of strong concealment of a direct sequence spread spectrum communication system and the advantages of strong anti-interference performance of the frequency hopping system. The transmitting device can directly transmit the generated mixing signal through the DAC module and the differential-single-ended conversion module, greatly saves cost compared with the traditional method of performing analog up-conversion by using an up-converter, and avoids the problems of temperature drift and aging of an analog circuit.
Drawings
Fig. 1 is a schematic structural diagram of a hybrid spread spectrum signal generating apparatus according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of the operation of the hybrid spread spectrum signal generating apparatus according to the embodiment of the present invention;
fig. 3 is a schematic hardware structure diagram of a hybrid spread spectrum signal transmitting apparatus according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Fig. 1 is a schematic structural diagram of a hybrid spread spectrum signal generating apparatus according to an embodiment of the present invention, as shown in fig. 1, the apparatus includes:
the direct sequence spread spectrum module is used for carrying out direct sequence spread spectrum on the code element information flow to generate a first spread spectrum signal and carrying out polarity conversion on the first spread spectrum signal;
the frequency hopping module is used for generating a plurality of paths of frequency hopping carrier waves;
and the mixed spread spectrum signal generating module is respectively electrically connected with the direct spread spectrum module and the frequency hopping module and is used for generating a mixed spread spectrum signal according to the first spread spectrum signal subjected to polarity conversion and the multi-channel frequency hopping carrier wave.
Specifically, the direct sequence spreading module is configured to perform direct sequence spreading on the symbol information stream to generate a first spread signal, and perform polarity conversion on the first spread signal.
Wherein, the direct sequence spread spectrum directly uses a spread spectrum code sequence with a high code rate to spread the spectrum of the signal at the transmitting end. The specific implementation of direct sequence spread spectrum is as follows: the information flow of the baseband signal with low code rate generated by the information source is multiplied by 1 set of set pseudo-random codes to realize direct sequence spread spectrum.
And performing polarity conversion on the first spread spectrum signal generated after the direct spread spectrum sequence. The specific process is to complement the back of each bit of the information sequence of the first spread spectrum signal with 1, so that the information sequence is changed into +1 and-1 signed numbers, thereby obtaining a baseband signal modulated by BPSK, wherein the obtained baseband signal modulated by BPSK is the first spread spectrum signal after polarity conversion.
And the frequency hopping module is used for generating a plurality of paths of sine wave carriers with hopping frequencies and settable initial phases. The hybrid spread spectrum signal generation module has the functions of:
multiplying the first spread spectrum signal after polarity conversion with each path of sine wave carrier in a plurality of paths of sine wave carriers respectively to generate a plurality of corresponding carrier modulation signals carrying frequency information and phase information; and combining the multiple carrier modulation signals to generate a high-speed mixed spread spectrum signal.
The device provided by this embodiment multiplies the first spread spectrum signal after polarity conversion by multiple frequency hopping carriers, and combines all multiplied results to generate a high-speed mixed spread spectrum signal, thereby improving the sampling rate of the transmitted data on the basis of integrating the advantages of strong concealment of the direct sequence spread spectrum communication system and the advantages of strong anti-interference performance of the frequency hopping system.
Based on the above embodiment, the hybrid spread spectrum signal generating module further includes:
the multiplier unit is used for multiplying the first spread spectrum signal subjected to polarity conversion with each path of frequency hopping carrier in the multiple paths of frequency hopping carriers respectively to generate multiple paths of frequency hopping carrier modulation signals;
the parallel-serial conversion unit is electrically connected with the multiplier unit and is used for combining the multiple paths of frequency hopping carrier modulation signals into one path of modulation signal;
wherein, the one path of modulation signal is the mixed spread spectrum signal.
Based on the above embodiment, the frequency hopping module is a direct digital frequency synthesizer.
Specifically, the direct digital frequency synthesizer may generate a plurality of frequency hopping carrier waves whose frequency and phase information meet actual requirements, and multiply the first spread spectrum signals obtained in the foregoing embodiments by polarity switching to obtain a plurality of frequency hopping carrier modulation signals carrying the frequency information and the phase information.
It should be noted that, the frequency and phase of the hopping carrier can be flexibly and accurately configured by using the direct digital frequency synthesizer, and the frequency and phase can realize fast hopping, so as to meet the speed requirement of switching the hopping frequency; meanwhile, in the embodiment, the phases of the frequency hopping carrier generated by the direct digital frequency synthesizer are continuous when the frequency points are switched, so that the tracking of the phase of each frequency point when the receiving end carries out carrier tracking is reduced, the information flow code sheet is aligned with the switching position of the frequency hopping frequency, and the coherent accumulation when the receiving end captures signals is facilitated.
Based on the above embodiment, the direct sequence spread spectrum module, the frequency hopping module and the mixed spread spectrum signal generating module are all located in the same FPGA chip.
In the generation device provided by this embodiment, the direct sequence spread spectrum module, the frequency hopping module and the mixed spread spectrum signal generation module are all disposed in the same FPGA chip, so that the generation rate of the mixed signal is increased, and the error rate of the mixed signal is reduced.
Based on the above embodiments, the present embodiment provides a transmission apparatus for a hybrid spread spectrum signal, the transmission apparatus including: a DAC module, a differential-to-single-ended conversion module, and a device for generating a hybrid spread spectrum signal in the above embodiments; wherein,
the generating device of the mixed spread spectrum signal is used for generating the mixed spread spectrum signal;
the DAC module is electrically connected with the generating device of the mixed spread spectrum signal and is used for converting the mixed spread spectrum signal into a differential analog signal;
the differential-single-ended conversion module is electrically connected with the DAC module and used for converting the differential analog signal into a single-ended analog signal and sending the single-ended analog signal.
Specifically, the purpose of this embodiment is to send out the generated mixing signal, and this embodiment can directly send out the generated mixing signal through the DAC module and the differential-to-single-ended conversion module, thereby greatly saving the cost and avoiding the problems of temperature drift and aging of the analog circuit compared with the conventional analog up-conversion using an up-converter.
Based on the foregoing embodiment, the transmitting apparatus in this embodiment further includes: and the clock module is electrically connected with the DAC module and used for providing clock signals for the DAC module.
Based on the above embodiment, the DAC module is further configured to send the clock signal to the generation device of the mixed spread spectrum signal, so that the DAC module and the generation device of the mixed spread spectrum signal are synchronized.
Preferably, the DAC module is a DAC chip, and the specific model is an AD9739 chip.
Specifically, the AD9739 chip is an ultra-high speed DAC chip with 14bit quantization bits and the highest sampling rate of 2.5Gsps, and the chip has the remarkable characteristic that the chip can directly send signals of S wave bands by using a self mixed mode, so that the cost is greatly saved compared with the traditional up-conversion mode, and the reliability of equipment is improved.
Based on the above embodiments, the present embodiment is taken as a preferred embodiment, and the present invention will be described in detail with reference to the accompanying drawings:
fig. 2 is a schematic diagram of a working flow of a generating apparatus for a hybrid spread spectrum signal according to an embodiment of the present invention, and as shown in fig. 2, the working flow of the generating apparatus is as follows:
the signal code in the form of bit information stream is multiplied by the preset pseudo random code to carry out direct sequence spread spectrum to obtain a first spread spectrum signal, and the polarity of the first spread spectrum signal is converted.
And obtaining total frequency information and phase information which meet the actual requirements according to the frequency hopping pattern and the parameter design. In order to improve the data rate, the frequency hopping carrier adopts 12 paths of parallel processing, and the frequency information and the phase information corresponding to each path of frequency hopping carrier are obtained by calculating the total frequency information and the phase information. And a direct digital frequency synthesizer is used for generating 12 paths of frequency hopping carrier waves of which the frequency information and the phase information meet the requirements, and the 12 paths of frequency hopping carrier waves are respectively multiplied by the first spread spectrum signals after polarity conversion to obtain 12 paths of modulation signals carrying the frequency information and the phase information.
And performing parallel-serial conversion on the obtained 12 paths of modulation signals to convert the modulation signals into a path of high-speed modulation signals, transmitting the signals to an ultra-high-speed AD9739 chip to perform digital-to-analog conversion to convert the signals into differential analog signals, and converting the differential analog signals into single-ended analog signals through balun to output, thereby realizing generation and sending of mixed spread spectrum signals.
It should be noted that the balun is a balun, which may also be called a differential-single-ended transformer, and is selected from TC1-33-75G2+, so that the frequency characteristic is relatively stable. The balun is electrically connected with the AD9739 chip and is used for converting the differential analog signal into a single-ended analog signal,
the preset pseudo-random code is changed, and then the process is executed, so that a first spread spectrum signal of direct sequence spread spectrum corresponding to different pseudo-random codes can be obtained, and the variable pseudo-random codes are realized. The control of the frequency hopping frequency switching rate can be realized by modifying the rate of frequency hopping pattern frequency information transition.
Taking the S-band signal of the hybrid spread spectrum sent by the sending end as an example, the specific implementation process of the present invention is further explained:
the frequency band of the frequency hopping carrier wave under the high signal-to-noise ratio is radio frequency, and the noise is white Gaussian noise.
Firstly, a sending end adopts a bit stream with the rate of 2.5kHz, the bit stream is directly multiplied by a group of pseudo-random codes with the length of 1024 to carry out direct sequence spread spectrum, an information sequence after spread spectrum is obtained, and the chip rate after spread spectrum is 2.56 MHz.
And step two, the back of each bit of the information sequence after the spread spectrum modulation is supplemented with 1, so that the information sequence is changed into the signed numbers of +1 and-1, and the baseband signal modulated by the BPSK is obtained.
And step three, generating 12 paths of sine wave carriers with hopping frequencies and settable initial phases by using a direct digital frequency synthesizer. Direct digital frequency synthesizer the data depth of the direct digital frequency synthesizer is 16384, the bit width is 14bit, a lookup table of 1/4 is adopted, the bit width of the phase accumulator is 48bit, and the precision is 1.96608 Gbps/248. Obtaining a frequency control word (stepping of a phase accumulator) corresponding to each frequency hopping point according to the frequency hopping pattern, calculating 12 paths of corresponding frequency control words, and realizing frequency hopping by changing the frequency control words so as to obtain 12 paths of frequency hopping carriers; the initial phase of the frequency hopping carrier can be modified by changing the initial value of the phase accumulator, and the phase can be randomly configured between 0 and 360 degrees. The rate of the frequency hopping carrier is 163.84 MHz.
And step four, multiplying the baseband data obtained in the step two by the 12 paths of frequency hopping sine wave carriers obtained in the step three respectively for carrier modulation, and taking 14 bits from the high-order bit-cutting of the multiplied 16-bit data. The bandwidth of the baseband data is negligible relative to the carrier frequency, so the phase of the baseband data does not need to be set. Then inputting the 12 paths of modulated signals into a parallel-serial conversion unit, reading data in a DDR form by taking a clock with 3 times of carrier as a high-speed clock, thereby obtaining a path of modulated signals with 12 times of carrier frequency, and generating a mixed spread spectrum signal.
And step five, the data processing of the step four is realized in an FPGA chip, and then the mixed spread spectrum signal obtained in the step four is transmitted to an AD9739 chip for digital-to-analog conversion, because the data is differential in the FPGA and the AD9739, a differential-to-single-ended balun is connected to the output end of the AD9739 to convert the output differential analog signal into a single-ended analog signal for output.
Fig. 3 is a schematic diagram of a hardware structure of a hybrid spread spectrum signal transmitting apparatus according to an embodiment of the present invention, and as shown in fig. 3, a power supply of the hybrid spread spectrum signal generating apparatus is provided by a backplane, and is converted into voltages required by each device through a power supply chipset. The PROM chip XCF128X is connected with the FPGA chip and used for storing the program of the signal generating module. And the clock module is connected with the outside and outputs a clock signal to the ultra-high-speed AD9739 chip. The clock signal is used as a sampling clock for transmitting data by the DAC, and the AD9739 outputs the clock signal to the FPGA chip, so that the FPGA chip performs signal processing according to the clock signal. The FPGA chip and the AD9739 chip are connected for data transmission, the output of the AD9739 chip is connected with a balun, and the balun is used for converting a differential analog signal into a single-ended analog signal for output.
Based on the foregoing embodiments, the method for generating a hybrid spread spectrum signal of this embodiment includes:
carrying out polarity conversion on a first spread spectrum signal generated by direct sequence spread spectrum;
generating a plurality of paths of frequency hopping carrier waves;
and generating a mixed spread spectrum signal according to the first spread spectrum signal subjected to polarity conversion and the multipath frequency hopping carrier waves.
It should be noted that, for specific contents, reference is made to the embodiment of the generating apparatus, and this embodiment does not limit this.
Wherein, the generating of the mixed spread spectrum signal according to the first spread spectrum signal after polarity conversion and the multiple frequency hopping carriers further comprises:
multiplying the first spread spectrum signal subjected to polarity conversion with each path of frequency hopping carrier in the multiple paths of frequency hopping carriers respectively to generate multiple paths of frequency hopping carrier modulation signals;
combining the multiple channels of frequency hopping carrier modulation signals into a channel of modulation signal; wherein, the one path of modulation signal is the mixed spread spectrum signal.
As a preferred embodiment, the method for measuring the phase continuity and the information stream chip and hopping frequency switching synchronization of the hybrid spread spectrum signal generated by the above embodiment is as follows: the output of the AD9739 is passed through a filter and transmitted to the receiving end via a coaxial cable. The receiving end carries out quadrature frequency mixing on the received mixed spread spectrum signal, down-conversion is carried out to a baseband, and the signal after down-conversion is carried out low-pass filtering to obtain a baseband signal. The baseband signals are subjected to down-sampling, the obtained data are used for searching for the frequency corresponding to the complete first hop and the accurate initial position, then the signals are subjected to debounce according to the frequency hopping pattern, the chip structure can be observed from the debounced signals, and the switching synchronization condition of the information flow chips and the frequency hopping frequency can be obtained through comparison with the chips generated locally. The de-hopped signal is de-spread using a pseudo-random code used for direct sequence spreading. Then, the despreading result is captured with the related peak, the obtained information is processed with operation to obtain the frequency and phase information, then the phase difference between each frequency point is compared, the condition of the mixed spread spectrum signal on the phase continuity can be obtained, and the measuring process is completed.
In summary, the present invention multiplies the first spread spectrum signal after polarity conversion by multiple frequency hopping carriers, and combines all the multiplied results to generate a high-speed mixed spread spectrum signal, thereby improving the data rate on the basis of integrating the advantages of strong concealment of the direct sequence spread spectrum communication system and the advantages of strong anti-interference performance of the frequency hopping system. The ultra-high speed DAC chip AD9739 with the sampling rate of 2.5Gsps can directly send the modulation signal of the S wave band, compared with the traditional analog up-conversion by using an up-converter, the cost is greatly saved, and the problems of temperature drift and aging of an analog circuit are avoided; the frequency and the phase of the frequency hopping carrier can be flexibly and accurately configured by utilizing the direct digital frequency synthesizer, and the frequency and the phase can realize rapid hopping so as to meet the speed requirement of frequency hopping frequency switching; meanwhile, the frequency points of the frequency hopping carrier generated by the direct digital frequency synthesizer are continuously switched in phase, so that the tracking of the phase of each frequency point when the receiving end carries out carrier tracking is reduced, the information flow code sheet is aligned with the switching position of the frequency hopping frequency, and the coherent accumulation when the receiving end captures signals is facilitated.
Finally, the embodiments of the present invention are merely preferred embodiments, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An apparatus for generating a hybrid spread spectrum signal, comprising:
the direct sequence spread spectrum module is used for carrying out direct sequence spread spectrum on the code element information flow to generate a first spread spectrum signal and carrying out polarity conversion on the first spread spectrum signal;
the frequency hopping module is used for generating a plurality of paths of frequency hopping carrier waves;
and the mixed spread spectrum signal generating module is respectively electrically connected with the direct spread spectrum module and the frequency hopping module and is used for generating a mixed spread spectrum signal according to the first spread spectrum signal subjected to polarity conversion and the multi-channel frequency hopping carrier wave.
2. The generation apparatus of claim 1, wherein the hybrid spread spectrum signal generation module further comprises:
the multiplier unit is used for multiplying the first spread spectrum signal subjected to polarity conversion with each path of frequency hopping carrier in the multiple paths of frequency hopping carriers respectively to generate multiple paths of frequency hopping carrier modulation signals;
the parallel-serial conversion unit is electrically connected with the multiplier unit and is used for combining the multiple paths of frequency hopping carrier modulation signals into one path of modulation signal;
wherein, the one path of modulation signal is the mixed spread spectrum signal.
3. The generation apparatus of claim 1, wherein the frequency hopping module is a direct digital frequency synthesizer.
4. The transmitter according to claim 1, wherein the direct sequence spread module, the frequency hopping module and the mixed spread spectrum signal generating module are all located in the same FPGA chip.
5. A transmitting apparatus for hybrid spread spectrum signals, comprising: a DAC module, a differential-to-single-ended conversion module, and the hybrid spread spectrum signal generating apparatus of any one of claims 1 to 4; wherein,
the generating device of the mixed spread spectrum signal is used for generating the mixed spread spectrum signal;
the DAC module is electrically connected with the generating device of the mixed spread spectrum signal and is used for converting the mixed spread spectrum signal into a differential analog signal;
the differential-single-ended conversion module is electrically connected with the DAC module and used for converting the differential analog signal into a single-ended analog signal and sending the single-ended analog signal.
6. The transmission apparatus according to claim 5, characterized by further comprising:
and the clock module is electrically connected with the DAC module and used for providing clock signals for the DAC module.
7. The transmitter according to claim 6, wherein the DAC module is further configured to transmit the clock signal to the generating device of the mixed spread-spectrum signal, so that the DAC module is synchronized with the generating device of the mixed spread-spectrum signal.
8. The transmitter of claim 5, wherein the DAC module is an AD9739 chip.
9. A method for generating a hybrid spread spectrum signal, comprising:
performing direct sequence spread spectrum on a symbol information stream to generate a first spread spectrum signal, and performing polarity conversion on the first spread spectrum signal;
generating a plurality of paths of frequency hopping carrier waves;
and generating a mixed spread spectrum signal according to the first spread spectrum signal subjected to polarity conversion and the multipath frequency hopping carrier waves.
10. The method of generating as claimed in claim 9, wherein the generating of the hybrid spread spectrum signal according to the polarity-switched first spread spectrum signal and the multiple frequency hopping carriers further comprises:
multiplying the first spread spectrum signal subjected to polarity conversion with each path of frequency hopping carrier in the multiple paths of frequency hopping carriers respectively to generate multiple paths of frequency hopping carrier modulation signals;
combining the multiple channels of frequency hopping carrier modulation signals into a channel of modulation signal; wherein, the one path of modulation signal is the mixed spread spectrum signal.
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| CN109660277B (en) * | 2018-12-28 | 2020-06-16 | 北京理工大学 | Hybrid spread spectrum information generation device and method |
| CN113037326A (en) * | 2021-05-31 | 2021-06-25 | 北京理工大学 | Spread spectrum communication method, device, equipment and readable storage medium |
| CN115378461A (en) * | 2022-10-25 | 2022-11-22 | 成都众享天地网络科技有限公司 | Simulation algorithm of time-hopping direct sequence spread spectrum signal |
| CN115378461B (en) * | 2022-10-25 | 2023-04-07 | 成都众享天地网络科技有限公司 | Simulation method of time-hopping direct sequence spread spectrum signal |
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