CN112804182A - Multi-carrier spread spectrum method and communication method and related device applied to same - Google Patents
Multi-carrier spread spectrum method and communication method and related device applied to same Download PDFInfo
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- CN112804182A CN112804182A CN202110387982.4A CN202110387982A CN112804182A CN 112804182 A CN112804182 A CN 112804182A CN 202110387982 A CN202110387982 A CN 202110387982A CN 112804182 A CN112804182 A CN 112804182A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/2621—Reduction thereof using phase offsets between subcarriers
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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
- H04B1/7097—Interference-related aspects
Abstract
The application provides a multi-carrier spread spectrum method, which comprises the following steps: acquiring signal data; the signal data is converted into serial and parallel signals
A way parallel information symbol sequence; according to spreading factor
Copying the parallel information symbol sequence; wherein the spreading factor
Is the length of the spreading sequence; multiplying said parallel information symbol sequence with said spreading sequence elements and using
Performing OFDM modulation by point inverse fast Fourier transform to obtain a modulated baseband signal after the signal data is spread; wherein the content of the first and second substances,
. The multi-carrier spread spectrum method can exert the spread spectrum gain thereof for improving the anti-interference capability of the system and improving the adaptability of the system in a complex environment. The present application also provides a communication method of multicarrier spread spectrum, a multicarrier spread spectrum system, a computer-readable storage medium and a communication device, having the above-mentioned advantageous effects.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a multi-carrier spread spectrum method, a communication method applied thereto, and a related apparatus.
Background
Orthogonal Frequency Division Multiplexing (OFDM) technology distributes a high-speed data stream to a plurality of relatively low-speed sub-channels through serial-to-parallel conversion for transmission, so that the symbol period in a signal is relatively increased, and interference caused by time dispersion generated by multipath effect in a system is reduced. Spread Spectrum communication (SS) technology spreads a transmitted narrowband signal and a pseudorandom sequence, thereby multiplying the bandwidth of the signal, spreading a useful signal over a very wide Spectrum, increasing the bandwidth of signal transmission by many times as compared with the bandwidth of information itself, and greatly dispersing the energy of the signal Spectrum. On the other hand, in the frequency band, the interference signal and the noise are transmitted along with the useful signal, the receiver performs despreading operation according to the pseudo random code to restore the broadband signal to the narrow-band signal, but the interference signal and the noise are not spread by the pseudo random sequence, so that the despreading operation can not be performed, the interference and noise components contained in the demodulated signal are greatly reduced, and the transmission performance of the system is remarkably improved.
At the transmitting end of the traditional multi-carrier spread spectrum system, information symbols are converted into serial-parallel conversion
A sequence of parallel information symbols is formed, each information symbol is then copied by a copy module, on the basis of which each information symbol is formedThe information symbols are multiplied by a spreading sequence and then OFDM modulated using IFFT.
At the receiving end of the conventional multi-carrier spread spectrum system, the signal processing process in the receiver is just opposite to that of the transmitter. After the received signals are subjected to time-frequency synchronization, cyclic prefix removal, serial-parallel conversion, FFT and other operations, each generated subcarrier is divided into two paths of signals, one path of signals is subjected to channel estimation and then is subjected to related despreading and frequency-spreading operation with the other path of signals, the sub-carrier signals after operation are sent to a merging module to be subjected to linear superposition operation, and finally, original signals are demodulated.
However, the despreading module of the conventional multi-carrier spread spectrum system is implemented in the frequency domain, that is, the signal demodulation module can obtain the spread spectrum gain, that is, the larger the spread spectrum gain is, the better the performance indexes of the system, such as the receiver sensitivity, etc. However, the multi-carrier spread spectrum system is required to work normally, the system is firstly time-frequency synchronized, and the time-frequency synchronization module only considers the multi-carrier spread spectrum system as a general OFDM system, and generally adopts the time-frequency synchronization algorithm of the OFDM system to perform time-frequency synchronization, so that the performance of the time-frequency synchronization is reduced along with the increase of the signal bandwidth. That is, the conventional multi-carrier spread spectrum system cannot exert its spread spectrum gain to improve the anti-interference capability of the system, and its adaptability in a complex environment is poor.
Disclosure of Invention
The present application is directed to a multi-carrier spread spectrum method, a multi-carrier spread spectrum communication method, a multi-carrier spread spectrum system, a computer readable storage medium, and a communication device, wherein a signal is duplicated and spread spectrum is first converted in serial-to-parallel, so that spread spectrum gain can be exerted to improve the anti-interference capability of the system and improve the adaptability of the system in a complex environment
In order to solve the above technical problem, the present application provides a multicarrier spreading method, which has the following specific technical scheme:
acquiring signal data;
the signal data is converted into serial and parallel signals
A way parallel information symbol sequence;
according to spreading factor
Copying the parallel information symbol sequence; wherein the spreading factor
Is the length of the spreading sequence;
multiplying said parallel information symbol sequence with said spreading sequence elements and using
Performing OFDM modulation by point inverse fast Fourier transform, and performing parallel-serial conversion to obtain a modulated baseband signal after the signal data is spread; wherein the content of the first and second substances,
and the modulation baseband signal is used for the signal transmitting end to execute signal transmission.
Optionally, if the modulated baseband signal is received, the method further includes:
multiplying the received modulation baseband signals with corresponding spread spectrum sequence elements respectively to obtain
A parallel information symbol sequence;
to be obtained
Partial parallel baseband signal and corresponding carrier signal
，
Multiplying to carry out frequency spectrum shifting;
obtained after shifting the frequency spectrum
And performing linear superposition operation on the parallel baseband signals to obtain a receiving signal after the modulation baseband signal is de-spread.
Optionally, obtained after shifting the frequency spectrum
After the parallel baseband signals are subjected to linear superposition operation, the method further comprises the following steps:
filtering out image signal and out-of-band noise by narrow-band low-pass filter, and performingMAnd (4) down-sampling of the multiple.
Optionally, after obtaining the target communication signal, the method includes:
performing time-frequency synchronization, serial-to-parallel conversion andKand performing point Fast Fourier Transform (FFT) and performing OFDM demodulation to obtain the signal data.
The application also provides a communication method based on the multi-carrier spread spectrum system, which comprises the following steps:
determining a spreading factor according to the signal receiving sensitivity; the spreading factor is positively correlated with the signal receiving sensitivity;
acquiring a maximum available bandwidth and the spreading factor;
determining the number of sub-channels according to the maximum available bandwidth and the maximum spreading factor;
and carrying out the multi-carrier spread spectrum method on the signal data in the sub-channel to obtain a modulation baseband signal and transmitting the modulation baseband signal.
Optionally, the method further includes:
and when the spread spectrum factor is larger than a preset value, utilizing a fast filter bank to perform interference filtering on the despread target signal.
Optionally, the interference filtering, performed on the despread target signal, by using the fast filter bank includes:
and replacing a first-order prototype filter of the fast Fourier transform with a high-order prototype filter to filter the interference of the despread target signal.
Optionally, the method further includes:
configuring the higher order prototype filter with a half-band filter; the coefficients of the half-band filter are symmetrical about zero time, the length of the filter is an odd number, and all impulse response values with even serial numbers larger than 0 of the half-band filter are 0.
The present application also provides a multicarrier spread spectrum system comprising:
the acquisition module is used for acquiring signal data;
a serial-to-parallel conversion module for performing serial-to-parallel conversion on the signal data to obtain
A way parallel information symbol sequence;
a spreading module for spreading factor
Copying the parallel information symbol sequence; wherein the spreading factor
Is the length of the spreading sequence;
a modulation module for multiplying said parallel information symbol sequence with said spreading sequence elements and utilizing
Performing OFDM modulation by point inverse fast Fourier transform, and performing parallel-serial conversion to obtain a modulated baseband signal after the signal data is spread; wherein the content of the first and second substances,
and the modulation baseband signal is used for the signal transmitting end to execute signal transmission.
The present application also provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method as set forth above.
The present application also provides a communication device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method as described above when calling the computer program in the memory.
The application provides a multi-carrier spread spectrum method, which comprises the following steps: acquiring signal data; the signal data is converted into serial and parallel signals
A way parallel information symbol sequence; according to spreading factor
Copying the parallel information symbol sequence; wherein the spreading factor
Is the length of the spreading sequence; multiplying said parallel information symbol sequence with said spreading sequence elements and using
Performing OFDM modulation by point inverse fast Fourier transform to obtain a modulated baseband signal after the signal data is spread; wherein the content of the first and second substances,
and the modulation baseband signal is used for the signal transmitting end to execute signal transmission.
The multi-carrier spread spectrum method provided by the application utilizes the influence of frequency domain spread spectrum on a signal time domain, firstly, de-spread operation is carried out in the time domain, and spread spectrum gain is obtained. And then, the multi-carrier spread spectrum system is used as a general OFDM system and is processed according to the general OFDM system. In summary, the provided multi-carrier spread spectrum method can exert the spread spectrum gain thereof for improving the anti-interference capability of the system, and improve the adaptability of the multi-carrier spread spectrum system in a complex environment.
The present application further provides a communication method of multi-carrier spread spectrum, a multi-carrier spread spectrum system, a computer-readable storage medium, and a communication device, which have the above beneficial effects and are not described herein again.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a multi-carrier spreading method according to an embodiment of the present application;
fig. 2 is a structural diagram of a transmitting end of a multi-carrier spread spectrum system according to an embodiment of the present application;
fig. 3 is a structural diagram of a receiving end of a multi-carrier spread spectrum system according to an embodiment of the present application;
fig. 4 is a diagram illustrating an analysis of communication performance gain of a multi-carrier spread spectrum system according to an embodiment of the present application;
fig. 5 is a signal spectrum diagram of a multi-carrier spread spectrum system when M is 16 according to an embodiment of the present application;
fig. 6 is a graph of a spectrum of a signal after despreading by the multi-carrier spread spectrum system with M being 16 according to the embodiment of the present application;
FIG. 7 is a schematic diagram of a narrow-band low-pass filter designed based on the FFB structure according to an embodiment of the present application;
FIG. 8 is a diagram of a signal spectrum after narrowband filtering according to an embodiment of the present application;
fig. 9 is a recovered signal constellation diagram provided by an embodiment of the present application;
fig. 10 is a schematic structural diagram of a multi-carrier spread spectrum system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a flowchart of a multi-carrier spreading method according to an embodiment of the present application, where the following described embodiment is described based on a signal transmitting end shown in fig. 2, and fig. 2 is a structural diagram of a transmitting end of a multi-carrier spreading system according to an embodiment of the present application, where the method includes:
s101: acquiring signal data;
s102: the signal data is converted into serial and parallel signals
A way parallel information symbol sequence;
as shown in fig. 2, in this step, signal data is converted from serial to parallel and then directly input to the copy module for copying. It should be noted that the duplication module does not have to be a separate module in the actual signal transmitting end, but may be implemented by the signal processing device, that is, the duplication module may be a part of hardware of the signal processing device, or may be implemented by the signal processing device executing a program corresponding to the duplication module. Serial-to-parallel conversion and parallel-to-serial conversion are well-established techniques in the art and are not described herein in detail.
This step obtains a parallel signal symbol sequence after serial-to-parallel conversion of the signal data, and
the value can be freely set by those skilled in the art when implementing serial-to-parallel conversion, and is not particularly limited herein.
S103: according to spreading factor
Copying the parallel information symbol sequence;
this step requires a step based on the spreading factor
Copying said parallel information symbol sequence with a spreading factor
Is the length of the spreading sequence. The spreading sequence is freely set by the person skilled in the art. I.e. the step is performed to obtain
An
A way parallel information symbol sequence.
S104: multiplying said parallel information symbol sequence with said spreading sequence elements and using
Performing OFDM modulation by point inverse fast Fourier transform to obtain a modulated baseband signal after the signal data is spread;
the step aims to multiply the parallel information symbol sequence and the spread spectrum sequence element, and then OFDM modulation is carried out, so that a modulation baseband signal can be obtained.
The multi-carrier spread spectrum method provided by the application utilizes the influence of frequency domain spread spectrum on a signal time domain, firstly, de-spread operation is carried out in the time domain, and spread spectrum gain is obtained. And then, the multi-carrier spread spectrum system is used as a general OFDM system and is processed according to the general OFDM system. In summary, the provided multi-carrier spread spectrum method can exert the spread spectrum gain thereof for improving the anti-interference capability of the system, and improve the adaptability of the multi-carrier spread spectrum system in a complex environment.
For ease of understanding, the resulting modulated baseband signal
Can be expressed as
Wherein the content of the first and second substances,
wherein the content of the first and second substances,
，
which represents a sequence of a spread spectrum,
indicating the length of the spreading sequence. The modulation baseband signal is used for the signal transmitting end to execute signal transmission.
Reissue to order
Then
（4）
Further, can obtain
As can be seen,
is that
Cyclic shift with a period N, and thus, there are linear properties and cyclic shift properties according to Discrete Fourier Transform (DFT)
And
as can be seen from equation (7), frequency domain spreading corresponds to spectral shifting in the time domain. In combination with the above analysis, for the transmitting end of the multi-carrier spread spectrum system shown in fig. 2, the present application also provides the receiving end of the multi-carrier spread spectrum system shown in fig. 3. The specific receiving process may be as follows:
s201: multiplying the received modulation baseband signals with corresponding spread spectrum sequence elements respectively to obtain
A parallel information symbol sequence;
s202: obtained by
Partial parallel baseband signal and corresponding carrier signal
，
Multiplying to carry out frequency spectrum shifting;
s203: obtained after shifting the frequency spectrum
And performing linear superposition operation on the partial parallel baseband signals to obtain a receiving signal after despreading the modulated baseband signals.
Obtained after shifting the frequency spectrum
After the partial parallel baseband signals are subjected to linear superposition operation, image signals and out-of-band noise can be filtered by utilizing a narrow-band low-pass filter, and thenMDown-sampling of the multiples (downsampled).
After the target communication signal is obtained, the time frequency synchronization, the serial-parallel conversion and the parallel-serial conversion can be carried out on the received signalKPoint fast Fourier transform, performing OFDMAnd demodulating to obtain original signal data.
It can be seen that, by utilizing the property shown in equation (7), the receiving end of the multicarrier spreading system shown in fig. 3 performs despreading operation, i.e. obtaining the despreading result through the duplication module
And receiving signals, multiplying each path of received signals by a corresponding spreading sequence element, carrying out corresponding spectrum shifting, and carrying out linear superposition on the basis, so that despreading is realized, signal energy aggregation is completed, and spreading gain is obtained. On the basis, the influence of out-of-band noise, image and interference is filtered by using a narrow-band low-pass filter, so that the interference and noise components in the signal are obviously reduced. And then, the signal demodulation is realized by utilizing the time-frequency synchronization, channel estimation and other technologies of the general OFDM system.
In the embodiment of the application, despreading operation is firstly carried out in a time domain to obtain spread spectrum gain. And then, the multi-carrier spread spectrum system is used as a general OFDM system and is processed according to a receiving module of the general OFDM system. In summary, the multi-carrier spread spectrum system provided by the present application can exert its spread spectrum gain for improving the anti-interference capability of the system, and improve the adaptability of the system in a complex environment.
Fig. 4 is a diagram of analysis of communication performance gain of a multi-carrier spread spectrum system provided in the embodiment of the present application, and it can be seen that as a spreading factor of the system increases, the system can obtain a larger spread spectrum gain, and the transmission performance of the system is obviously improved.
The multi-carrier spread spectrum method provided by the embodiment of the application utilizes the influence of frequency domain spread spectrum on the signal time domain, firstly, the de-spread operation is carried out in the time domain, and spread spectrum gain is obtained. And then, the multi-carrier spread spectrum system is used as a general OFDM system and is processed according to the general OFDM system. In summary, the provided multi-carrier spread spectrum method can exert the spread spectrum gain thereof for improving the anti-interference capability of the system, and improve the adaptability of the multi-carrier spread spectrum system in a complex environment.
On the basis of the foregoing embodiments, the present application further provides a communication method based on a multi-carrier spread spectrum system, including:
s201: determining a spreading factor according to the signal receiving sensitivity; the spreading factor is positively correlated with the signal receiving sensitivity;
s202: acquiring a maximum available bandwidth and a spreading factor;
s203: determining the number of sub-channels according to the maximum available bandwidth and the maximum spreading factor;
s204: and performing multi-carrier spread spectrum on the signal data in the sub-channel to obtain a modulated baseband signal and transmitting the modulated baseband signal.
And when the spread spectrum factor is larger than a preset value, utilizing a fast filter bank to perform interference filtering on the despread target signal. Specifically, a first-order prototype filter of the fast fourier transform may be replaced with a higher-order prototype filter to perform interference filtering on the despread target signal. Further, a higher order prototype filter may also be configured with a half band filter. The coefficients of the half-band filter are symmetrical about zero time, the length of the filter is odd, and all impulse response values with even serial numbers larger than 0 of the half-band filter are 0.
Suppose that the system obtains a maximum available bandwidth of
MHz, the maximum available bandwidth
MHz division into
A sub-channel of which
，
. On the other hand, in the case of a liquid,
is the maximum spreading factor of the multi-carrier spread spectrum system.
Representing the total number of sub-carriers in the system,
indicating the number of subcarriers per subchannel, each subchannel reserved for adjacent channel protection and out-of-band rejection
A virtual subcarrier. Combining the multi-carrier spread spectrum system, configuring different spread spectrum factors by software
To achieve wide-narrow converged communication, e.g. when spreading factor
The system is equivalent to a general OFDM system, i.e. supports wideband communication,
the larger the spread spectrum gain of the system is, the better the receiver sensitivity of the system is, but correspondingly, the lower the effective data rate of the system transmission is, thereby realizing the wide-narrow converged communication.
FIG. 5 shows
The signal spectrum diagram of the transmitting end of the 16-time multi-carrier spread spectrum system is shown in figure 6
In all 16-hour receiving ends of the multi-carrier spread spectrum system, after despreading, signal spectrograms are shown, and it can be seen that target signal energy after despreading is gathered, but interference of image components also exists, so that interference filtering needs to be performed by using a narrow-band filter.
As can be seen from fig. 6, to achieve the extraction of the target signal, the design of the narrow-band filter with good filtering characteristics is critical.In particular, when the spreading factor
When the sampling frequency is large, the sampling frequency is high and the channel bandwidth is narrow, so that the narrow-band low-pass filtering designed by adopting the traditional polyphase filter can be realized only by a very high order, the realization complexity is very high, and a lot of hardware resources are consumed.
To solve this problem, the present application proposes to implement Fast Filter Bank (FFB) technology. The FFB is an extended form of the FFT, and the core idea is to replace a first-order prototype filter of the FFT with a higher-order prototype filter to improve the side lobe attenuation of the FFT. Compared with the FFT, the FFB prototype filters at each stage have fewer nonzero coefficients, can keep the low complexity characteristic of the FFT, have a cascade structure form and are convenient for hardware implementation. Fig. 7 is a schematic diagram of a narrow-band low-pass filter designed based on the FFB structure according to an embodiment of the present disclosure.
The time-frequency transformation expression of the FFB is as follows:
wherein the content of the first and second substances,
is a channel
D is
The length of (a) of (b),
and N is the number of channels of the FFB.
From the channel
The coefficients of the sub-filters of each stage are obtained by convolution, and the expression is as follows:
as can be seen from (9), the sub-filter coefficients of each stage of channel k are obtained by interpolating the prototype filter coefficients of each stage to different degrees. To reduce the computational complexity of the FFB, the prototype filter is usually designed in the form of a half-band filter. The coefficients of the half-band filter are symmetrical about zero time, the length of the filter is odd, and all the impulse response values of the filter with even serial numbers larger than 0 are 0. Channel
The relationship between each stage of sub-filter coefficients and prototype filter coefficients is:
wherein the content of the first and second substances,
is as follows
Time domain effective range of stage prototype filter coefficients
。
Fig. 8 and 9 show the target signal spectrum after narrow-band filtering and the recovered signal constellation, respectively. Therefore, the multi-carrier spread spectrum communication method provided by the application can realize reliable and stable transmission of information, can give full play to spread spectrum gain of the system, and improves the communication performance of the system in a complex environment.
In the following, a multi-carrier spread spectrum system provided by the embodiments of the present application is introduced, and the multi-carrier spread spectrum system described below and the multi-carrier spread spectrum method described above may be referred to correspondingly.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a multi-carrier spread spectrum system provided in an embodiment of the present application, and the present application further provides a multi-carrier spread spectrum system, including:
an obtaining module 100, configured to obtain signal data;
a serial-to-parallel conversion module 200 for performing serial-to-parallel conversion on the signal data to obtain
A way parallel information symbol sequence;
a spreading module 300 for spreading factor-dependent
Copying the parallel information symbol sequence; wherein the spreading factor
Is the length of the spreading sequence;
a modulation module 400 for multiplying said parallel information symbol sequence with said spreading sequence elements and utilizing
Performing OFDM modulation by point inverse fast Fourier transform, and performing parallel-serial conversion to obtain a modulated baseband signal after the signal data is spread; wherein the content of the first and second substances,
and the modulation baseband signal is used for the signal transmitting end to execute signal transmission.
Based on the above embodiment, as a preferred embodiment, the method further includes:
a signal receiving module, configured to multiply the received modulated baseband signals with corresponding spreading sequence elements, respectively, to obtain
Share parallel information symbolA sequence of numbers; to be obtained
Partial parallel baseband signal and corresponding carrier signal
，
Multiplying to carry out frequency spectrum shifting; obtained after shifting the frequency spectrum
And performing linear superposition operation on the parallel baseband signals to obtain a receiving signal after the modulation baseband signal is de-spread.
Based on the above embodiment, as a preferred embodiment, the method further includes:
a noise reduction module for filtering image signal and out-of-band noise by using a narrow-band low-pass filter, and performingMAnd (4) down-sampling of the multiple.
Based on the above embodiment, as a preferred embodiment, the method includes:
a signal demodulation module for performing time-frequency synchronization, serial-to-parallel conversion andKand performing point Fast Fourier Transform (FFT) and performing OFDM demodulation to obtain the signal data.
The present application also provides a computer readable storage medium having stored thereon a computer program which, when executed, may implement the steps provided by the above-described embodiments. The storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The present application further provides a communication device, which may include a memory and a processor, where the memory stores a computer program, and the processor may implement the steps provided in the foregoing embodiments when calling the computer program in the memory. Of course, the communication device may also include various network interfaces, power supplies, and the like.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system provided by the embodiment, the description is relatively simple because the system corresponds to the method provided by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (11)
1. A multi-carrier spreading method, comprising:
acquiring signal data;
the signal data is converted into serial and parallel signals
A way parallel information symbol sequence;
according to spreading factor
Copying the parallel information symbol sequence; wherein the spreading factor
Is the length of the spreading sequence;
multiplying said parallel information symbol sequence with said spreading sequence elements and using
Performing OFDM modulation by point inverse fast Fourier transform, and performing parallel-serial conversion to obtain a modulated baseband signal after the signal data is spread; wherein the content of the first and second substances,
and the modulation baseband signal is used for the signal transmitting end to execute signal transmission.
2. The multi-carrier spread spectrum method of claim 1, further comprising, if the modulated baseband signal is received:
multiplying the received modulation baseband signals with corresponding spread spectrum sequence elements respectively to obtain
A parallel information symbol sequence;
to be obtained
Partial parallel baseband signal and corresponding carrier signal
，
Multiplying to carry out frequency spectrum shifting;
and performing linear superposition operation on the partial parallel baseband signals obtained after the frequency spectrum shifting to obtain the receiving signals after the modulation baseband signals are de-spread.
3. A multi-carrier spread spectrum method according to claim 2, characterized in that the spectrum is shifted to obtain
After the parallel baseband signals are subjected to linear superposition operation, the method further comprises the following steps:
and filtering the image signal and the out-of-band noise by using a narrow-band low-pass filter, and performing down-sampling by M times to obtain a target communication signal.
4. The multi-carrier spreading method according to claim 2 or 3, further comprising, after obtaining the target communication signal:
performing time-frequency synchronization, serial-to-parallel conversion andKand performing point Fast Fourier Transform (FFT) and performing OFDM demodulation to obtain the signal data.
5. A communication method based on a multi-carrier spread spectrum system, comprising:
determining a spreading factor according to the signal receiving sensitivity; the spreading factor is positively correlated with the signal receiving sensitivity;
acquiring a maximum available bandwidth and the spreading factor;
determining the number of sub-channels according to the maximum available bandwidth and the maximum spreading factor;
performing the multi-carrier spread spectrum method of any one of claims 1-4 on the signal data in the sub-channel to obtain a modulated baseband signal and transmitting.
6. The communication method according to claim 5, further comprising:
and when the spread spectrum factor is larger than a preset value, utilizing a fast filter bank to perform interference filtering on the despread target signal.
7. The communication method of claim 6, wherein the interference filtering the despread target signal using a fast filter bank comprises:
and replacing a first-order prototype filter of the fast Fourier transform with a high-order prototype filter to filter the interference of the despread target signal.
8. The communication method according to claim 7, further comprising:
configuring the higher order prototype filter with a half-band filter; the coefficients of the half-band filter are symmetrical about zero time, the length of the filter is an odd number, and all impulse response values with even serial numbers larger than 0 of the half-band filter are 0.
9. A multi-carrier spread spectrum system, comprising:
the acquisition module is used for acquiring signal data;
a serial-to-parallel conversion module for performing serial-to-parallel conversion on the signal data to obtain
A way parallel information symbol sequence;
a spreading module for spreading factor
Copying the parallel information symbol sequence; wherein the spreading factor
Is the length of the spreading sequence;
modulation moduleFor multiplying said parallel information symbol sequence with said spreading sequence elements and using
Performing OFDM modulation by point inverse fast Fourier transform, and performing parallel-serial conversion to obtain a modulated baseband signal after the signal data is spread; wherein the content of the first and second substances,
and the modulation baseband signal is used for the signal transmitting end to execute signal transmission.
10. A computer readable storage medium, having a computer program stored thereon, wherein the computer program, when being executed by a processor, is adapted to carry out the steps of the multicarrier spreading method according to any of claims 1 to 4 or the steps of the communication method based on a multicarrier spreading system according to any of claims 5 to 8.
11. A communication device, characterized in that it comprises a memory in which a computer program is stored and a processor, which when invoking the computer program in the memory implements the steps of the multi-carrier spreading method according to any of claims 1-4 or the steps of the communication method based on a multi-carrier spreading system according to any of claims 5-8.
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| CN113922850A (en) * | 2021-09-07 | 2022-01-11 | 西北大学 | Distributed MU-MIMO channel estimation algorithm and transmission method in LoRa uplink system |
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| CN113518051B (en) * | 2021-09-14 | 2021-12-07 | 中国人民解放军国防科技大学 | Signal receiving method, device, equipment and medium for multi-carrier spread spectrum communication system |
| CN114006799A (en) * | 2021-10-29 | 2022-02-01 | 西安交通大学 | Passive RFID-oriented spread spectrum and broadband perception enhancement method and system |
| CN114006799B (en) * | 2021-10-29 | 2022-10-25 | 西安交通大学 | Passive RFID-oriented spread spectrum and broadband perception enhancement method and system |
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| WO2024031880A1 (en) * | 2022-08-09 | 2024-02-15 | 网络通信与安全紫金山实验室 | Beam decoupling method for multiple beams, transmitting end and receiving end |
| CN116405055B (en) * | 2023-06-07 | 2023-08-29 | 中国人民解放军国防科技大学 | Spread spectrum communication method, system and related device |
| CN116405055A (en) * | 2023-06-07 | 2023-07-07 | 中国人民解放军国防科技大学 | Spread spectrum communication method, system and related device |
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