CN113452404B - Multi-carrier spread spectrum capturing method and device, electronic equipment and storage medium - Google Patents
Multi-carrier spread spectrum capturing method and device, electronic equipment and storage medium Download PDFInfo
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- H—ELECTRICITY
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- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
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- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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Abstract
The invention provides a multi-carrier spread spectrum capturing method, a device, electronic equipment and a storage medium, wherein the method comprises the following steps: receiving a multi-carrier spread spectrum signal and dividing the multi-carrier spread spectrum signal into a plurality of sub-carrier baseband signals; determining a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal; determining a phase difference compensation result of each path of subcarrier baseband signal by adopting a fast Fourier transform algorithm according to a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal and performing phase compensation; after phase compensation, all coherent combination is carried out on each path of subcarrier baseband signals to determine a capture two-dimensional plane after combination of each path of subcarrier baseband signals, and detection judgment is carried out on the capture two-dimensional plane. The invention utilizes the fast Fourier transform algorithm to complete the phase accurate compensation of the subcarrier baseband signal, can reduce the operation complexity and reduce the merging loss among subcarriers.
Description
Technical Field
The present invention relates to the field of signal transmission technologies, and in particular, to a method and an apparatus for acquiring multicarrier spread spectrum, an electronic device, and a storage medium.
Background
The low earth orbit satellite (LEO) communication system has the advantages of wide coverage range, long communication distance, short transmission delay, flexible networking, low construction cost and the like, and becomes the best choice for realizing global coverage mobile communication. The direct sequence spread spectrum code division multiple access (DS-CDMA) technology has the characteristics of multi-user parallel communication, low signal-to-noise ratio communication, ranging and direction finding and the like, and is widely applied to a low-earth-orbit satellite communication system.
The multi-carrier direct sequence spread spectrum code division multiple access (MC-DS-CDMA) technology introduces a multi-carrier (MC) technology on the basis of the direct sequence spread spectrum code division multiple access (DS-CDMA) technology, respectively modulates the same spread spectrum signals to carriers with different frequencies for transmission, and further increases the bandwidth of the spread spectrum signals on the basis of the DS-CDMA technology so as to achieve the functions of deep spread spectrum and further reducing the power spectral density of the signals. Meanwhile, the MC-DS-CDMA technology can achieve higher code phase capturing precision than the DS-CDMA technology, and has certain advantages in ranging, direction finding, despreading and demodulation.
However, in the MC-DS-CDMA technology, since the signal-to-noise ratio is lower compared to the DS-CDMA communication system, the multi-carriers need to be combined in the receiver to obtain a combining gain that satisfies the demodulation performance requirement. The acquisition technology is the first step in the MC-DS-CDMA communication receiver to complete the function of MC-DS-CDMA signal access. Among the existing acquisition techniques, there are many acquisition techniques that perform non-coherent combining among multiple carriers. The technology has the advantages of simple algorithm, low hardware resource consumption and short acquisition access time, but the incoherent combination has combination loss and small combination gain, and the problem that a user cannot access under the condition of extremely low signal-to-noise ratio is solved. In the existing multi-carrier full-coherent combining and capturing technology, a specific phase is compensated for a correlation result according to different code phases among multiple carriers, and then the combination among the multiple carriers is carried out. The technology has higher combining gain, but a large amount of compensation value calculation is needed in phase compensation, and the serial calculation needs longer time delay in hardware implementation, so that the requirement of low access time delay of low-orbit satellite communication is difficult to meet.
Disclosure of Invention
To solve the problems in the prior art, embodiments of the present invention provide a method and an apparatus for acquiring multicarrier spread spectrum, an electronic device, and a storage medium.
In a first aspect, an embodiment of the present invention provides a method for acquiring multicarrier spread spectrum, including:
receiving a multi-carrier spread spectrum signal;
dividing the multi-carrier spread spectrum signal into multi-subcarrier baseband signals;
multiplying any path of subcarrier baseband signals by a sequence subjected to cyclic shift of a local pseudo-random code, and adding to obtain a pseudo-code phase correlation result corresponding to the subcarrier baseband signals;
determining a phase difference compensation result of each path of subcarrier baseband signal by adopting a fast Fourier transform algorithm according to a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal;
performing phase compensation on a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal according to the phase difference compensation result of each path of subcarrier baseband signal;
after phase compensation, all coherent combination is carried out on each path of subcarrier baseband signals to determine a capture two-dimensional plane after combination of each path of subcarrier baseband signals, and detection judgment is carried out on the capture two-dimensional plane.
Further, the dividing the multicarrier spread spectrum signal into multiple subcarrier baseband signals specifically includes:
and performing multi-path parallel subcarrier orthogonal down-conversion and matched filtering on the multi-carrier spread spectrum signal to obtain a multi-path subcarrier baseband signal.
Further, after the phase compensation, performing full coherent combining on each path of subcarrier baseband signals to determine a captured two-dimensional plane after combining each path of subcarrier baseband signals, and performing detection and decision on the captured two-dimensional plane specifically includes:
after phase compensation, performing full-coherent combination on each path of subcarrier baseband signals to determine a two-dimensional plane after combination of each path of subcarrier baseband signals, and judging each related peak value of the two-dimensional plane according to a preset judgment threshold value.
Further, still include:
firstly, Doppler precompensation is carried out on each path of subcarrier baseband signal;
correspondingly, multiplying any path of subcarrier baseband signal by a sequence after cyclic shift of a local pseudo-random code, and then adding to obtain a pseudo-code phase correlation result corresponding to the subcarrier baseband signal, specifically comprising:
multiplying the sub-carrier baseband signal subjected to Doppler precompensation with a sequence subjected to local pseudo-random code cyclic shift, and then adding to obtain a pseudo-code phase correlation result corresponding to the sub-carrier baseband signal.
In a second aspect, an embodiment of the present invention provides a multicarrier spread spectrum capturing apparatus, including:
a receiving module, configured to receive a multi-carrier spread spectrum signal;
a branching module for dividing the multicarrier spread spectrum signal into a plurality of subcarrier baseband signals;
the pseudo code correlation module is used for multiplying any path of subcarrier baseband signal by a sequence after cyclic shift of a local pseudo random code and then adding to obtain a pseudo code phase correlation result corresponding to the subcarrier baseband signal;
the fast Fourier transform calculation module is used for determining a phase difference compensation result of each path of subcarrier baseband signal by adopting a fast Fourier transform algorithm according to a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal;
the phase compensation module is used for performing phase compensation on a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal according to the phase difference compensation result of each path of subcarrier baseband signal;
and the merging module is used for carrying out full-coherent merging on each path of subcarrier baseband signals after phase compensation to determine a captured two-dimensional plane after each path of subcarrier baseband signals are merged, and carrying out detection judgment on the captured two-dimensional plane.
Further, the splitting module is specifically configured to:
and performing multi-path parallel subcarrier orthogonal down-conversion and matched filtering on the multi-carrier spread spectrum signal to obtain a multi-path subcarrier baseband signal.
Further, the merging module is specifically configured to:
after phase compensation, performing full-coherent combination on each path of subcarrier baseband signals to determine a two-dimensional plane after combination of each path of subcarrier baseband signals, and judging each related peak value of the two-dimensional plane according to a preset judgment threshold value.
Further, still include: a pre-compensation module for pre-compensating the pre-compensation signal,
the pre-compensation module is used for firstly performing Doppler pre-compensation on each path of subcarrier baseband signal;
correspondingly, the pseudo code correlation module is specifically configured to:
multiplying the sub-carrier baseband signal subjected to Doppler precompensation with a sequence subjected to local pseudo-random code cyclic shift, and then adding to obtain a pseudo-code phase correlation result corresponding to the sub-carrier baseband signal.
In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the multicarrier spread spectrum acquisition method according to the first aspect when executing the program.
In a fourth aspect, the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the multicarrier spread spectrum acquisition method according to the first aspect.
As can be seen from the foregoing technical solutions, the multicarrier spread spectrum capture method, apparatus, electronic device and storage medium provided in the embodiments of the present invention receive a multicarrier spread spectrum signal; dividing the multi-carrier spread spectrum signal into multi-subcarrier baseband signals; multiplying any path of subcarrier baseband signals by a sequence subjected to cyclic shift of a local pseudo-random code, and adding to obtain a pseudo-code phase correlation result corresponding to the subcarrier baseband signals; determining a phase difference compensation result of each path of subcarrier baseband signal by adopting a fast Fourier transform algorithm according to a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal; performing phase compensation on a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal according to the phase difference compensation result of each path of subcarrier baseband signal; after phase compensation, all coherent combination is carried out on each path of subcarrier baseband signals to determine a capture two-dimensional plane after combination of each path of subcarrier baseband signals, and detection judgment is carried out on the capture two-dimensional plane. The invention utilizes the fast Fourier transform algorithm to complete the phase accurate compensation of the subcarrier baseband signal, can reduce the operation complexity and reduce the merging loss among subcarriers.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart illustrating a multi-carrier spread spectrum acquisition method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a multi-carrier spread spectrum acquiring apparatus according to an embodiment of the present invention;
fig. 3 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention. 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 invention. The multi-carrier spread spectrum acquisition method provided by the present invention will be explained and illustrated in detail by specific embodiments.
Fig. 1 is a flowchart illustrating a multi-carrier spread spectrum acquisition method according to an embodiment of the present invention; as shown in fig. 1, the method includes:
step 101: a multi-carrier spread spectrum signal is received.
Step 102: and dividing the multi-carrier spread spectrum signal into a plurality of sub-carrier baseband signals.
Step 103: multiplying any path of subcarrier baseband signals by a sequence after cyclic shift of a local pseudo-random code, and then adding to obtain a pseudo-code phase correlation result corresponding to the subcarrier baseband signals.
In this step, for example, the spreading ratio of the 16-channel spread spectrum signal is 1024. Each path of subcarrier baseband signal is multiplied by a sequence after cyclic shift of a pseudo-random code sequence with local length of 1024 and then added to obtain 1024 correlation results. 16 paths of subcarrier correlation channels obtain 16 x 1024 correlation results.
Step 104: and determining the phase difference compensation result of each path of subcarrier baseband signal by adopting a fast Fourier transform algorithm according to the pseudo code phase correlation result corresponding to each path of subcarrier baseband signal.
In this step, for example, 16-point fast fourier transform operation is performed on correlation results of the same code phase in 16 paths of subcarrier correlation channels, 1024 times of 16-point fast fourier transform operation are required in 1024 code phases, and a matrix of 16 × 1024 is obtained after the operation, that is, a subcarrier baseband signal phase difference compensation result.
Step 105: and performing phase compensation on the pseudo code phase correlation result corresponding to each path of subcarrier baseband signal according to the phase difference compensation result of each path of subcarrier baseband signal.
In this step, for example, the 16 × 1024 phase difference compensation result is subjected to matrix splicing transformation to obtain a vector of 1 × 16384. The vector of 1 × 16384 is the phase compensation result for the original 1024-length code phase correlation result.
Step 106: after phase compensation, all coherent combination is carried out on each path of subcarrier baseband signals to determine a capture two-dimensional plane after combination of each path of subcarrier baseband signals, and detection judgment is carried out on the capture two-dimensional plane.
In this embodiment, it should be noted that, in the embodiment of the present invention, based on a multi-carrier direct sequence spread spectrum code division multiple access (MC-DS-CDMA) technology, with low-earth-orbit satellite terrestrial communication as a background, a multi-carrier spread spectrum acquisition method is designed, in which a fast fourier transform algorithm is used to complete inter-subcarrier phase precise compensation and perform full coherent combining on each path of subcarrier baseband signals, so that under the condition that access time of the terrestrial communication is limited, full coherent accumulation among subcarriers can be completed through fast acquisition, which is beneficial to reducing combining loss among subcarriers.
For a multicarrier spread signal arriving at the receiver, in this embodiment, the receiver may split the multicarrier spread signal, firstly, the signals are divided into a plurality of paths and enter N frequency offset factor searching channels in parallel, each frequency offset factor searching channel divides a multicarrier spread spectrum signal into U paths to obtain a plurality of paths of subcarrier baseband signals, each path of subcarrier baseband signal corresponds to a subcarrier related channel, the subcarrier related channels comprise a subcarrier related channel 1, a subcarrier related channel 2, a subcarrier related channel U, for any path of subcarrier baseband signal and local pseudo-random code, after a certain delay estimation parameter control cyclic shift, the correlation operation is completed to obtain the correlation peak of subcarrier signal, that is, any path of subcarrier baseband signal is multiplied by a sequence after cyclic shift of a local pseudo random code and then added to obtain a pseudo code phase correlation result corresponding to the subcarrier baseband signal.
In this embodiment, it should be noted that, in order to implement full coherent combining of cross-subcarrier signals, the phase difference between the correlation peaks of each subcarrier needs to be compensated with higher delay estimation accuracy before combining. In this embodiment, the phase difference compensation result of each path of subcarrier baseband signal is determined by using a fast fourier transform algorithm according to the pseudo code phase correlation result corresponding to each path of subcarrier baseband signal, so that the complexity of the operation can be significantly reduced, then the phase compensation is performed on the pseudo code phase correlation result corresponding to each path of subcarrier baseband signal according to the phase difference compensation result of each path of subcarrier baseband signal, after the phase compensation, the full coherence combination is performed on each path of subcarrier baseband signal to determine the two-dimensional plane after the combination of each path of subcarrier baseband signal, and the detection and the judgment are performed on the two-dimensional plane.
As can be seen from the above technical solutions, the multicarrier spread spectrum capturing method provided in the embodiments of the present invention receives a multicarrier spread spectrum signal; dividing the multi-carrier spread spectrum signal into multi-subcarrier baseband signals; multiplying any path of subcarrier baseband signals by a sequence subjected to cyclic shift of a local pseudo-random code, and adding to obtain a pseudo-code phase correlation result corresponding to the subcarrier baseband signals; determining a phase difference compensation result of each path of subcarrier baseband signal by adopting a fast Fourier transform algorithm according to a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal; performing phase compensation on a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal according to the phase difference compensation result of each path of subcarrier baseband signal; after phase compensation, all coherent combination is carried out on each path of subcarrier baseband signals to determine a capture two-dimensional plane after combination of each path of subcarrier baseband signals, and detection judgment is carried out on the capture two-dimensional plane. The invention utilizes the fast Fourier transform algorithm to complete the phase accurate compensation of the subcarrier baseband signal, can reduce the operation complexity and reduce the merging loss among subcarriers.
On the basis of the foregoing embodiment, in this embodiment, the dividing the multicarrier spread signal into multiple subcarrier baseband signals specifically includes:
and performing multi-path parallel subcarrier orthogonal down-conversion and matched filtering on the multi-carrier spread spectrum signal to obtain a multi-path subcarrier baseband signal.
On the basis of the foregoing embodiment, in this embodiment, after the phase compensation, the performing full coherent combining on each path of subcarrier baseband signals to determine a captured two-dimensional plane after combining each path of subcarrier baseband signals, and performing detection and decision on the captured two-dimensional plane specifically includes:
after phase compensation, performing full-coherent combination on each path of subcarrier baseband signals to determine a two-dimensional plane after combination of each path of subcarrier baseband signals, and judging each related peak value of the two-dimensional plane according to a preset judgment threshold value.
On the basis of the above embodiment, in this embodiment, the method further includes:
firstly, Doppler precompensation is carried out on each path of subcarrier baseband signal;
correspondingly, multiplying any path of subcarrier baseband signal by a sequence after cyclic shift of a local pseudo-random code, and then adding to obtain a pseudo-code phase correlation result corresponding to the subcarrier baseband signal, specifically comprising:
multiplying the sub-carrier baseband signal subjected to Doppler precompensation with a sequence subjected to local pseudo-random code cyclic shift, and then adding to obtain a pseudo-code phase correlation result corresponding to the sub-carrier baseband signal.
In order to better understand the present invention, the following examples are further provided to illustrate the content of the present invention, but the present invention is not limited to the following examples.
For example: for the multi-carrier spread spectrum signal reaching the receiver, the receiver carries out multi-path parallel sub-carrier orthogonal down-conversion and matched filtering on the multi-carrier spread spectrum signal to obtain each path of sub-carrier baseband signal, and for the estimated value of the sub-carrier frequency offset, Doppler pre-compensation parameters are generated and multiplied by the received sub-carrier baseband signal, and then the multiplied Doppler pre-compensation parameters are added. After the sub-carrier signals after the modulation removal and the local pseudo-random code are subjected to certain delay estimation parameter control cyclic shift, the correlation operation is completed, and the correlation peak on each sub-carrier is obtained. In order to realize cross-subcarrier signal full-coherent combination, phase difference between correlation peaks of subcarriers needs to be compensated with higher delay estimation precision before combination. Because the calculation amount of directly performing fine compensation on the phase is large, the multi-carrier spread spectrum capturing method provided by the embodiment of the invention can directly perform detection and judgment on the combined signal output after FFT calculation. And for any estimated value in the Doppler and delay search ranges, the compensation and operation operations are completed, and the output signal after each combination is compared with a preset decision threshold to obtain a correlation peak detection result of the delay-Doppler two-dimensional plane.
The embodiment of the invention has the following requirements on each subcarrier frequency of the MC-DS-CDMA signal:
in the above formula, the first and second carbon atoms are,f i is as followsiThe frequency of each of the sub-carriers,
is a fixed frequency difference. Namely, the frequency points of each subcarrier are distributed at equal intervals,
it is ensured that there is no aliasing between the individual sub-carriers,B u representing the subcarrier bandwidth, the number of subcarriers U is an integer power of 2.
The input signal (i.e. multicarrier spread spectrum signal) is firstly divided into a plurality of paths and enters N frequency offset factor searching channels in parallel. Frequency offset factorαThe definition is as follows:
in the above formula, the first and second carbon atoms are,αfor the frequency offset factor to be a function of,vthe radial relative movement speed of the star-earth is,cis the speed of light.
The multi-carrier spread spectrum signal is the superposition of each sub-carrier spread spectrum signal, and is firstly divided into U paths to carry out frequency point of each sub-carrierf u The quadrature mixing + the matched filtering is performed,
in the above formula, the first and second carbon atoms are,
pseudo code correlation module entering in subcarrier correlation channelThe baseband signal of the block is then transmitted,
refers to the input signal of the frequency offset factor search channel, exp refers to the exponential function,jrefers to the unit of imaginary numbers in the euler equation,
refers to the frequency offset factor corresponding to the current frequency offset factor search channel,f c refers to the intermediate frequency of the input signal,f u refers to the subcarrier frequency corresponding to the channel related to the current subcarrier,
refers to the matched filter coefficients.
According to the orthogonality among the subcarriers, the subcarriers can be separated on the frequency domain, and U paths of mutually uncorrelated subcarrier baseband signals are obtained. The matched filtering not only completes the operation of root raised cosine matching, but also filters the signals outside the sub-carrier bandwidth. Doppler precompensated signal and local pseudo-random code cyclic shifted sequence
The multiplication completes the correlation operation, wherein
Representing an estimate of the delay. After the correlation operation is completed on each subcarrier, a correlation peak vector is obtained
To complete the cross-subcarrier full-coherent combining, fine compensation of the correlation peak phase is required, although the delay is already compensated before the correlation operation is completed
A preliminary search is done but the search accuracy is far from sufficient compared to the accuracy required for coherent combining.
In order to reduce the loss of coherent combining of subcarriers and reduce the algorithm complexity required by the fine compensation operation of subcarrier delay, the present embodiment adopts FFT operation to complete the precise phase compensation + coherent combining operation between subcarriers, and the process can be expressed as:
in the above formula, the first and second carbon atoms are,
refers to the Doppler estimated value of the signal,
refers to the first re-delay estimate,
refers to the second re-delay estimate,
means the Doppler estimated value, the double delay estimated value: (
And
) The peak of the correlation at the bottom of the correlation,Uthe number of the sub-carriers is referred to,
refers to the correlation peak between the doppler estimate and the first re-delay estimate for the subcarrier, exp refers to an exponential function,jrefers to the unit of imaginary numbers in the euler equation,f u and the subcarrier frequency corresponding to the channel related to the current subcarrier is referred to.
In the embodiment, a square law detector is adopted to detect and judge the captured two-dimensional plane according to a preset thresholdV TH Making a decision for each correlation peak of the two-dimensional plane if
Then the detection is successful, and
the joint estimate of (a) carries parametric information for the multi-carrier signal.
The embodiment of the invention can obviously improve the capturing performance when the signal-to-noise ratio is low, and can obviously reduce the operation complexity by adopting a Fast Fourier Transform (FFT) algorithm to complete the phase compensation among the sub-carriers.
Fig. 2 is a schematic structural diagram of a multi-carrier spread spectrum acquiring apparatus according to an embodiment of the present invention, as shown in fig. 2, the apparatus includes: a receiving module 201, a splitting module 202, a pseudo code correlation module 203, a fast fourier transform calculation module 204, a phase compensation module 205 and a combining module 206, wherein:
the receiving module 201 is configured to receive a multicarrier spread spectrum signal;
a splitting module 202, configured to split the multicarrier spread spectrum signal into multiple subcarrier baseband signals;
the pseudo code correlation module 203 is configured to multiply any one path of subcarrier baseband signal with a sequence after cyclic shift of a local pseudo random code, and add the product to obtain a pseudo code phase correlation result corresponding to the subcarrier baseband signal;
the fast fourier transform calculation module 204 is configured to determine a phase difference compensation result of each path of subcarrier baseband signal by using a fast fourier transform algorithm according to a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal;
a phase compensation module 205, configured to perform phase compensation on a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal according to the phase difference compensation result of each path of subcarrier baseband signal;
and a combining module 206, configured to perform full-coherent combining on each path of subcarrier baseband signals after phase compensation to determine a two-dimensional plane obtained by combining each path of subcarrier baseband signals, and perform detection and decision on the two-dimensional plane.
The multi-carrier spread spectrum capture device provided in the embodiment of the present invention may be specifically configured to execute the multi-carrier spread spectrum capture method in the foregoing embodiment, and the technical principle and the beneficial effect thereof are similar, and reference may be specifically made to the foregoing embodiment, which is not described herein again.
Based on the same inventive concept, an embodiment of the present invention provides an electronic device, which specifically includes the following contents with reference to fig. 3: a processor 301, a communication interface 303, a memory 302, and a communication bus 304;
the processor 301, the communication interface 303 and the memory 302 complete mutual communication through the communication bus 304; the communication interface 303 is used for realizing information transmission between related devices such as modeling software, an intelligent manufacturing equipment module library and the like; the processor 301 is used for calling the computer program in the memory 302, and the processor executes the computer program to implement the method provided by the above method embodiments, for example, the processor executes the computer program to implement the following steps: receiving a multi-carrier spread spectrum signal; dividing the multi-carrier spread spectrum signal into multi-subcarrier baseband signals; multiplying any path of subcarrier baseband signals by a sequence subjected to cyclic shift of a local pseudo-random code, and adding to obtain a pseudo-code phase correlation result corresponding to the subcarrier baseband signals; determining a phase difference compensation result of each path of subcarrier baseband signal by adopting a fast Fourier transform algorithm according to a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal; performing phase compensation on a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal according to the phase difference compensation result of each path of subcarrier baseband signal; after phase compensation, all coherent combination is carried out on each path of subcarrier baseband signals to determine a capture two-dimensional plane after combination of each path of subcarrier baseband signals, and detection judgment is carried out on the capture two-dimensional plane.
Based on the same inventive concept, yet another embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, is implemented to perform the methods provided by the above-mentioned method embodiments, for example, receiving a multi-carrier spread spectrum signal; dividing the multi-carrier spread spectrum signal into multi-subcarrier baseband signals; multiplying any path of subcarrier baseband signals by a sequence subjected to cyclic shift of a local pseudo-random code, and adding to obtain a pseudo-code phase correlation result corresponding to the subcarrier baseband signals; determining a phase difference compensation result of each path of subcarrier baseband signal by adopting a fast Fourier transform algorithm according to a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal; performing phase compensation on a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal according to the phase difference compensation result of each path of subcarrier baseband signal; after phase compensation, all coherent combination is carried out on each path of subcarrier baseband signals to determine a capture two-dimensional plane after combination of each path of subcarrier baseband signals, and detection judgment is carried out on the capture two-dimensional plane.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods of the various embodiments or some parts of the embodiments.
In addition, in the present invention, terms such as "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Moreover, in the present invention, relational terms such as first and second, and the like may be 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.
Furthermore, in the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A multi-carrier spread spectrum acquisition method, comprising:
receiving a multi-carrier spread spectrum signal;
dividing the multi-carrier spread spectrum signal into multi-subcarrier baseband signals;
multiplying any path of subcarrier baseband signals by a sequence subjected to cyclic shift of a local pseudo-random code, and adding to obtain a pseudo-code phase correlation result corresponding to the subcarrier baseband signals;
determining a phase difference compensation result of each path of subcarrier baseband signal by adopting a fast Fourier transform algorithm according to a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal;
performing phase compensation on a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal according to the phase difference compensation result of each path of subcarrier baseband signal;
after phase compensation, performing full-coherent combination on each path of subcarrier baseband signals by adopting a fast Fourier transform algorithm to determine a capture two-dimensional plane after each path of subcarrier baseband signals are combined, and performing detection judgment on the capture two-dimensional plane.
2. The method according to claim 1, wherein said dividing the multi-carrier spread spectrum signal into multi-subcarrier baseband signals, specifically comprises:
and performing multi-path parallel subcarrier orthogonal down-conversion and matched filtering on the multi-carrier spread spectrum signal to obtain a multi-path subcarrier baseband signal.
3. The multi-carrier spread spectrum acquisition method according to claim 1, wherein after the phase compensation, the fully coherent combining is performed on each path of subcarrier baseband signals to determine an acquisition two-dimensional plane after each path of subcarrier baseband signals are combined, and the detection decision is performed on the acquisition two-dimensional plane, specifically comprising:
after phase compensation, performing full-coherent combination on each path of subcarrier baseband signals to determine a two-dimensional plane after combination of each path of subcarrier baseband signals, and judging each related peak value of the two-dimensional plane according to a preset judgment threshold value.
4. The multi-carrier spread spectrum acquisition method of claim 1, further comprising:
firstly, Doppler precompensation is carried out on each path of subcarrier baseband signal;
correspondingly, multiplying any path of subcarrier baseband signal by a sequence after cyclic shift of a local pseudo-random code, and then adding to obtain a pseudo-code phase correlation result corresponding to the subcarrier baseband signal, specifically comprising:
multiplying the sub-carrier baseband signal subjected to Doppler precompensation with a sequence subjected to local pseudo-random code cyclic shift, and then adding to obtain a pseudo-code phase correlation result corresponding to the sub-carrier baseband signal.
5. A multi-carrier spread spectrum acquisition apparatus, comprising:
a receiving module, configured to receive a multi-carrier spread spectrum signal;
a branching module for dividing the multicarrier spread spectrum signal into a plurality of subcarrier baseband signals;
the pseudo code correlation module is used for multiplying any path of subcarrier baseband signal by a sequence after cyclic shift of a local pseudo random code and then adding to obtain a pseudo code phase correlation result corresponding to the subcarrier baseband signal;
the fast Fourier transform calculation module is used for determining a phase difference compensation result of each path of subcarrier baseband signal by adopting a fast Fourier transform algorithm according to a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal;
the phase compensation module is used for performing phase compensation on a pseudo code phase correlation result corresponding to each path of subcarrier baseband signal according to the phase difference compensation result of each path of subcarrier baseband signal;
and the combining module is used for performing full-coherent combining on each path of subcarrier baseband signals by adopting a fast Fourier transform algorithm after phase compensation to determine a capturing two-dimensional plane after each path of subcarrier baseband signals are combined, and detecting and judging the capturing two-dimensional plane.
6. The multicarrier spread spectrum acquisition apparatus according to claim 5, wherein the splitting module is specifically configured to:
and performing multi-path parallel subcarrier orthogonal down-conversion and matched filtering on the multi-carrier spread spectrum signal to obtain a multi-path subcarrier baseband signal.
7. The multi-carrier spread spectrum acquisition apparatus according to claim 5, wherein the combining module is specifically configured to:
after phase compensation, performing full-coherent combination on each path of subcarrier baseband signals to determine a two-dimensional plane after combination of each path of subcarrier baseband signals, and judging each related peak value of the two-dimensional plane according to a preset judgment threshold value.
8. The multi-carrier spread spectrum acquisition apparatus according to claim 5, further comprising: a pre-compensation module for pre-compensating the pre-compensation signal,
the pre-compensation module is used for firstly performing Doppler pre-compensation on each path of subcarrier baseband signal;
correspondingly, the pseudo code correlation module is specifically configured to:
multiplying the sub-carrier baseband signal subjected to Doppler precompensation with a sequence subjected to local pseudo-random code cyclic shift, and then adding to obtain a pseudo-code phase correlation result corresponding to the sub-carrier baseband signal.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the multi-carrier spread spectrum acquisition method according to any one of claims 1 to 4 when executing the program.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the multi-carrier spread spectrum acquisition method according to any one of claims 1 to 4.
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