CN113992489B - Radar communication integrated method, device, equipment and medium based on OFDM signals - Google Patents
Radar communication integrated method, device, equipment and medium based on OFDM signals Download PDFInfo
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
Abstract
The disclosure provides an OFDM signal-based radar communication integration method, including: setting parameters of an OFDM comb spectrum signal integrated with radar communication to obtain a subcarrier set of the OFDM comb spectrum signal; dividing the subcarrier set into a comb-shaped first subcarrier set and a comb-shaped second subcarrier set, wherein the first subcarrier set is occupied by radar signals, and the second subcarrier set is occupied by communication signals; modulating the radar signal into the weight of a first subcarrier set, and modulating the communication signal into the weight of a second subcarrier set; and combining the weight of the first subcarrier set and the weight of the second subcarrier set to form the OFDM comb spectrum signal. The disclosure also provides a radar communication integrated device based on the OFDM comb spectrum, an electronic device and a storage medium. The radar communication integrated signal obtained by the method not only can obtain excellent pulse pressure side lobe performance of the LFM signal, but also can not lose communication freedom degree; the method only involves one-dimensional Fourier transform and inverse transform operations, and is easy to implement.
Description
Technical Field
The disclosure relates to the technical field of radars, and in particular relates to a radar communication integration method, device, electronic equipment and medium based on an OFDM signal.
Background
Whether in the traditional military field or in the 5G/B5G emerging civil field, people hope to construct a radar and communication integrated electronic system, realize information fusion between two functions and sharing utilization of limited resources, and solve the problems of huge volume, serious electromagnetic interference, intense competition of spectrum resources and the like of the traditional multi-function system cooperation. At present, a part of European and American military countries have developed radar communication integrated hardware systems, and gradually transfer research emphasis to integrated signals so as to further realize sharing of frequency spectrum resources by radar and communication.
However, the theoretical basis of radar and communication, the signal design criteria, the signal processing method, and the like are not the same. The design and processing of radar communication integrated signals are constrained by the basic theory of classical radar detection theory, shannon information theory, pasteur theorem and the like, and face a plurality of contradictions. In this regard, expert scholars at home and abroad have conducted a great deal of research.
At present, the research of radar communication integrated signals is mainly divided into three paths of communication common signals, radar common signals and code division multiplexing signals. The radar shared signal is mainly radar signals. By adjusting radar signal parameters to bear communication information, radar and communication functions can be realized simultaneously, in the same frequency and in the same space. However, to ensure radar performance, there are few adjustable parameters of the radar signal. Therefore, the communication data rate of the radar-shared signal is generally low. For example, randall, in its published paper "A Method for Calculating Error Probabilities in a Radar Communication System [ J ], IEEE Transactions on Space Electronics & Telemetry,2007,9 (2): a unidirectional communication scheme is proposed in 37-42 where communication data is modulated with radar pulses. The scheme modulates the information communicated by adjusting the position of each pulse relative to a reference pulse. However, a set of radar pulses can only modulate 1bit of communication information. The communication common signal is mainly a communication signal. The radar performance is considered by adjusting the communication signal parameters, and the radar and communication functions can be realized simultaneously, in the same frequency and in the same space. Communication common waveforms are a current research hotspot. Garmatyuk et al, in its published paper, "Multifunctional software-defined radar sensor and data communication system [ J ]. IEEE Sensors Journal,2011, 11 (1): 99-106, "propose an OFDM-based radar communication integrated signal design, processing, and system scheme. However, the high-order amplitude-phase modulation, CP, pilot frequency, etc. of the communication may introduce spurious peaks and too high side lobes in its blurring function, thereby generating spurious detection targets and flooding tiny targets. If the radar ambiguity function is considered by adjusting the communication signal parameters, the communication data rate is inevitably greatly reduced. The code division multiplexing signal is to design a special signal meeting the respective requirements of radar and communication, and then to compound the two signals into an integrated signal by utilizing the code division multiplexing technology. However, the code division multiplexing technique is not a strict orthogonal technique, and may introduce mutual interference between the radar and the communication. This is mainly because the code division multiplexing technique can only make the zero delay inner product between the same frequency signals zero. In contrast, radar quadrature definition is derived from a mutual ambiguity function, requiring that the inner product of two co-frequency signals at any delay be zero. Clearly, code division multiplexing techniques do not meet the orthogonality requirements of radar under the constraints of the pasmodus theorem. If the code division multiplexing technology is adopted to compound the radar and the communication special signals, the communication can introduce the same-frequency interference into the radar pulse pressure result. From the time domain, co-channel interference appears as the level of cross-correlation of the radar signal with the communication signal. If a large number of scatterers exist in the scene, the interference energy inevitably generates an accumulation effect, so that the noise floor is greatly lifted. As described above, in the prior art, the radar-shared signal, the communication-shared signal, and the code division multiplexing signal cannot simultaneously, and simultaneously, and spatially compromise the radar and communication performance.
Disclosure of Invention
In view of the above, the present invention provides an integrated radar communication method based on OFDM signals, so as to at least partially solve the above technical problems.
One aspect of the present disclosure provides an OFDM signal-based radar communication integration method, including: setting parameters of an OFDM comb spectrum signal integrated with radar communication to obtain a subcarrier set of the OFDM comb spectrum signal; dividing the subcarrier set into a comb-shaped first subcarrier set and a comb-shaped second subcarrier set, wherein the first subcarrier set is occupied by radar signals, and the second subcarrier set is occupied by communication signals; modulating the radar signal into the weight of the first subcarrier set, and modulating the communication signal into the weight of the second subcarrier set; and combining the weight of the first subcarrier set and the weight of the second subcarrier set to form the OFDM comb spectrum signal.
Optionally, the parameters of the OFDM comb spectrum signal at least comprise a bandwidth B, a symbol effective time width T, a subband bandwidth Deltaf, and a cyclic prefix time width T CP The total time width T' of the symbol is T+T CP The total number of subcarriers N is BT, and the subcarrier set a of the OFDM comb spectrum signal is denoted { i·Δf, i=0, 1,2, …, N-1}; setting a subcarrier spacing S of the first subcarrier set, then the first subcarrier set a R For { i.S.DELTA.f, i=0, 1,2, …, N/S-1}, the second set of subcarriers A C Is A-A R The method comprises the steps of carrying out a first treatment on the surface of the The time width of the radar signal is T/S, the bandwidth is B, and the frequency K is adjusted r The value is BS/T.
Optionally, the modulating the radar signal into the weights of the first set of subcarriers includes: acquiring a discrete time domain representation of the radar signal, wherein the data length of the discrete time domain representation of the radar signal is N/S, N represents the total number of subcarriers, and S represents the subcarrier interval of a first subcarrier set; zero padding is carried out on the discrete time domain representation of the radar signal, and the data length of the discrete time domain representation is padded to N; performing discrete Fourier transform on the discrete time domain representation of the radar signal after zero padding to obtain a discrete spectrum value of the radar signal, wherein the length is N; and taking a value positioned at the frequency point of the first subcarrier set in the discrete spectrum value of the radar signal as a weight of the first subcarrier set.
Optionally, the modulating the communication signal into the weights of the second set of subcarriers includes: performing channel coding and QAM modulation on the communication signal; adding a pilot signal to the communication signal after modulation and coding, and taking the communication signal as a weight of a second subcarrier set; wherein, the pilot signal is used for estimating the channel response when processing the communication signal after the OFDM comb spectrum signal is received by the receiving end.
Optionally, the combining the weights of the first subcarrier set and the weights of the second subcarrier set to form the OFDM comb spectrum signal includes: taking the union of the weight of the first subcarrier set and the weight of the second subcarrier set to obtain the frequency spectrum of the OFDM comb spectrum signal; and transforming the frequency spectrum of the OFDM comb spectrum signal to a time domain, and adding a cyclic prefix to form the OFDM comb spectrum signal.
Optionally, the method further comprises: after the OFDM comb spectrum signal is received by a receiving end, removing a cyclic prefix in the OFDM comb spectrum signal, and transforming the OFDM comb spectrum signal to a discrete frequency domain; and separating the weight of the first subcarrier set and the weight of the second subcarrier set from the transformed OFDM comb spectrum signal, wherein the weight of the first subcarrier set is the data of the radar signal, and the weight of the second subcarrier set is the data of the communication signal.
Optionally, the method further comprises: processing the data of the radar signal by using a radar processing algorithm to obtain radar detection information contained in the radar signal; and processing the data of the communication signal by using a communication processing method to obtain communication transmission information contained in the communication signal.
A second aspect of the present disclosure provides an OFDM signal-based radar communication integration apparatus, including: the parameter setting module is used for setting parameters of the OFDM comb spectrum signal integrated with radar communication to obtain a subcarrier set of the OFDM comb spectrum signal; the subcarrier allocation module is used for dividing the subcarrier set into a comb-shaped first subcarrier set and a comb-shaped second subcarrier set, wherein the first subcarrier set is occupied by radar signals, and the second subcarrier set is occupied by communication signals; the signal modulation module is used for modulating the radar signal into the weight of the first subcarrier set and modulating the communication signal into the weight of the second subcarrier set; and the radar communication integrated module is used for combining the weight of the first subcarrier set and the weight of the second subcarrier set to form the OFDM comb spectrum signal.
Another aspect of the present disclosure provides an electronic device, comprising: the system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, and is characterized in that each step in the radar communication integration method based on the OFDM signal is realized when the processor executes the computer program.
Another aspect of the present disclosure provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the OFDM signal-based radar communication integration method.
The above at least one technical scheme adopted in the embodiment of the disclosure can achieve the following beneficial effects:
compared with the prior art, the method and the device have the advantages that contradictory requirements of radar detection and wireless communication on signals can be met under the constraint of the same time, same frequency and same space. The radar communication integrated signal based on the OFDM comb spectrum signal not only inherits the excellent point spread function of the LFM signal, but also does not influence the degree of freedom of high-speed wireless communication. Furthermore, the implementation of the present disclosure is relatively simple, mainly involving fast fourier transform and inverse transform operations.
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For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
fig. 1 schematically illustrates an application scenario diagram of an OFDM signal-based radar communication integration method and apparatus provided by an embodiment of the present disclosure;
fig. 2 schematically illustrates a schematic diagram of an OFDM signal-based radar communication integration method provided by an embodiment of the present disclosure;
fig. 3 schematically illustrates a schematic diagram of an OFDM signal-based radar communication integration method provided in another embodiment of the present disclosure;
fig. 4 schematically illustrates a communication reception constellation based on a communication common signal provided by an embodiment of the present disclosure;
fig. 5 schematically illustrates a radar detection result diagram based on a communication common signal provided by an embodiment of the present disclosure;
fig. 6 schematically illustrates a discrete spectrum plot of a single symbol of an OFDM signal-based radar communication integration signal provided by an embodiment of the present disclosure;
fig. 7 schematically illustrates a time domain real part diagram of a single symbol of an OFDM signal-based radar communication integration signal provided by an embodiment of the present disclosure;
fig. 8 schematically illustrates a radar detection result diagram of an OFDM signal-based radar communication integrated signal provided by an embodiment of the present disclosure;
fig. 9 schematically illustrates a communication reception constellation of an OFDM signal-based radar communication integrated signal provided by an embodiment of the present disclosure;
fig. 10 schematically illustrates a block diagram of a radar communication integrated apparatus based on OFDM signals according to an embodiment of the present disclosure;
fig. 11 schematically illustrates a block diagram of an electronic device according to an embodiment of the disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is only exemplary and is not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and/or the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.
Some of the block diagrams and/or flowchart illustrations are shown in the figures. It will be understood that some blocks of the block diagrams and/or flowchart illustrations, or combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the instructions, when executed by the processor, create means for implementing the functions/acts specified in the block diagrams and/or flowchart.
Thus, the techniques of this disclosure may be implemented in hardware and/or software (including firmware, microcode, etc.). Additionally, the techniques of this disclosure may take the form of a computer program product on a computer-readable medium having instructions stored thereon, the computer program product being usable by or in connection with an instruction execution system. In the context of this disclosure, a computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the instructions. For example, a computer-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, device, or propagation medium. Specific examples of the computer readable medium include: magnetic storage devices such as magnetic tape or hard disk (HDD); optical storage devices such as compact discs (CD-ROMs); a memory, such as a Random Access Memory (RAM) or a flash memory; and/or a wired/wireless communication link.
Aiming at the problems and the shortcomings of the existing radar communication integrated signals, the disclosure provides a radar communication integrated signal design and processing method based on an OFDM comb spectrum, and the core idea is as follows: from the subcarrier multiplexing perspective, the radar LFM signal discrete spectrum value and the communication QAM data are distributed to different subcarriers to form subcarrier multiplexing signals. If viewed solely from a radar or communication perspective, both spectra are comb-shaped. Thus, this multiplexed signal form may be referred to as a comb spectrum signal. It can be seen that for OFDM comb spectrum signals, the radar and communication are co-frequency and both have bandwidths equal to the total bandwidth of the signal. In addition, the radar subcarrier can be regarded as a communication pilot frequency for improving the channel estimation precision. More importantly, due to ideal orthogonality among OFDM subcarriers, radar-specific signals and communication-specific signals do not interfere with each other.
In order to achieve the above purpose, the present disclosure provides an OFDM comb spectrum-based radar communication integration method, so as to consider radar and communication signals simultaneously, in the same frequency and in the same space.
Fig. 1 schematically illustrates an application scenario diagram of an OFDM signal-based radar communication integration method and apparatus provided in an embodiment of the present disclosure.
As shown in fig. 1, the method and the device for integrating radar communication based on the OFDM comb spectrum provided in the embodiments of the present disclosure may be applied to a scenario such as an aircraft, where communication and radar requirements are simultaneously met, and an integrated radar communication signal based on the OFDM comb spectrum may be received by a receiving device, so that the receiving device may obtain a radar signal and a communication signal simultaneously.
Fig. 2 schematically illustrates a schematic diagram of an OFDM signal-based radar communication integration method provided in an embodiment of the present disclosure.
As shown in fig. 2, an embodiment of the present disclosure provides an OFDM comb spectrum-based radar communication integration method, including operations S210 to S240.
In operation S210, parameters of an OFDM comb spectrum signal integrated with radar communication are set, and a subcarrier set of the OFDM comb spectrum signal is obtained.
Wherein the parameters of the OFDM comb spectrum signal at least comprise a bandwidth B, a symbol effective time width T, a subband bandwidth Deltaf and a cyclic prefix time width T CP Etc., wherein the total time width T' of the symbol is T+T CP The total number of subcarriers N is BT and the set of subcarriers a of the OFDM comb spectrum signal is denoted { i·Δf, i=0, 1,2, …, N-1}.
In operation S220, the subcarrier set is divided into a comb-shaped first subcarrier set occupied by a radar signal and a comb-shaped second subcarrier set occupied by a communication signal.
Setting a subcarrier spacing S, preferably N/S, of the first subcarrier set, wherein N/S is an integer, the first subcarrier set A R For { i.S.DELTA.f, i=0, 1,2, …, N/S-1}, the second set of subcarriers A C Is A-A R 。
In operation S230, the radar signal is modulated to the weight of the first set of subcarriers, and the communication signal is modulated to the weight of the second set of subcarriers.
Wherein the modulating the radar signal into the weight of the first subcarrier set includes operations S231 to S234.
In operation S231, a discrete time domain representation of the radar signal is acquired, the data length of the discrete time domain representation of the radar signal being N/S, N representing a total number of subcarriers, S representing a subcarrier spacing of the first set of subcarriers.
If the signal oversampling rate is 1, then the modulation is to set A R Can be expressed in the discrete time domain as:
the time width of the radar signal is T/S, the bandwidth is B, and the frequency K is adjusted r The value is BS/T, and the parameters not only determine the performances of radar resolution, action distance and the like, but also are beneficial to guiding the generation of specific signals.
S (n) cannot be directly modulated to A R . Instead, s (n) is transformed into the discrete frequency domain to obtain discrete spectral values and the corresponding discrete spectrum is modulated into A R 。
In operation S232, the discrete time domain representation of the radar signal is zero padded, with its data length being padded to N.
And (3) zero padding the length of the radar signal, wherein the number of zero padding is (N-N/S), and the length of the total sampling point of the radar time domain data after zero padding is N.
In operation S233, discrete fourier transform is performed on the discrete time domain representation of the radar signal after zero padding, to obtain a discrete spectrum value of the radar signal, where the length is N.
In operation S234, a value located at the frequency point of the first subcarrier set in the discrete spectrum value of the radar signal is used as a weight value of the first subcarrier set.
Modulating the communication signal to the weights of the second set of subcarriers includes operations S235-S236.
In operation S235, the communication signal is channel-coded and QAM modulated.
In operation S236, a pilot signal is added to the communication signal after modulation encoding, and the signal is used as a weight of the second subcarrier set.
Wherein, the pilot signal is used for estimating the channel response when processing the communication signal after the OFDM comb spectrum signal is received by the receiving end.
It can be understood that the weight of the first subcarrier set is the modulated radar signal, and the weight of the second subcarrier set is the modulated communication signal.
In operation S240, the weights of the first subcarrier set and the weights of the second subcarrier set are combined to form the OFDM comb spectrum signal.
Specifically, operation S240 includes operations S241 to S242.
In operation S241, a union of the weights of the first subcarrier set and the weights of the second subcarrier set is taken, so as to obtain a frequency spectrum of the OFDM comb spectrum signal.
In operation S242, the spectrum of the OFDM comb spectrum signal is transformed to the time domain, and a cyclic prefix is added to form the OFDM comb spectrum signal.
The cyclic prefix is formed by copying signals at the tail of the OFDM symbol to the head, can be associated with other multipath component information to obtain complete information, and can also realize time pre-estimation and frequency synchronization.
For the continuous radar signal and communication signal, the radar signal and communication signal of the same time sequence need to be integrated into one OFDM comb spectrum signal in sequence according to the time sequence, so as to form the continuous comb spectrum signal.
Fig. 3 schematically illustrates a schematic diagram of an OFDM signal-based radar communication integration method according to another embodiment of the present disclosure.
As shown in fig. 3, after the OFDM comb spectrum signal is synthesized according to the method provided in the embodiment of the present disclosure, since the signal is used for communication, the method further includes a parsing process for receiving the OFDM comb spectrum signal by the receiving end, including operations S310 to S320.
In operation S310, after the OFDM comb spectrum signal is received by a receiving end, cyclic prefixes in the OFDM comb spectrum signal are removed.
In operation S320, the OFDM comb spectrum signal is transformed from a time domain to a discrete frequency domain.
In operation S330, weights of the first subcarrier set and weights of the second subcarrier set are separated from the transformed OFDM comb spectrum signal, where the weights of the first subcarrier set are data of the radar signal and the weights of the second subcarrier set are data of the communication signal.
Wherein the communication signal may be identified using pilot signal data in the weights of the second set of subcarriers, thereby demodulating the radar signal and the communication signal, respectively.
After the radar signal and the communication signal are acquired, information included in the radar signal and the communication signal is acquired through operations S331 to S332.
In operation S331, data of the radar signal is processed using a radar processing algorithm to obtain radar detection information included in the radar signal.
In operation S332, data of the communication signal is processed using a communication processing method to obtain communication transmission information contained in the communication signal.
Both radar processing algorithms and communication processing algorithms may use classical radar, communication processing algorithms.
According to the method provided by the embodiment of the disclosure, contradictory requirements of radar detection and wireless communication on signals can be considered under the constraint of the same time, the same frequency and the same space. The radar communication integrated signal based on the OFDM comb spectrum signal not only inherits the excellent point spread function of the LFM signal, but also does not influence the degree of freedom of high-speed wireless communication. In addition, the implementation process of the invention is relatively simple, and mainly relates to the fast Fourier transform and inverse transform operation.
A specific embodiment will be described in detail below with reference to fig. 4 to 9, where fig. 4 to 5 schematically show a communication receiving constellation diagram and a radar detection result diagram based on a communication common signal provided by an embodiment of the disclosure, and fig. 6 to 9 schematically show a discrete spectrum diagram, a time domain real part diagram, a radar detection result diagram and a communication receiving constellation diagram of a single symbol of a radar communication integration signal based on an OFDM comb spectrum provided by an embodiment of the disclosure.
Firstly, determining simulation parameters of OFDM signals, wherein the specific setting of the simulation parameters is as follows:
table 1 OFDM comb spectrum signal parameters
In the abstract application scenario shown in table 1 parameters and fig. 1, if communication data is placed on the radar subcarrierThe classical communication OFDM signal is formed and is used as a radar communication integrated signal under a communication common signal system. As can be seen from fig. 4, the communication common signal is a communication ideal signal, and has excellent communication performance, and the communication data rate and the error rate are 320Mbps and 10 Mbps respectively -5 . However, as can be seen from fig. 5, the radar detection performance of the communication common signal is poor, and there are too high side lobes and spurious peaks in the pulse pressure result. Excessive side lobes and false peaks often introduce false targets, submerge tiny targets, raise the noise floor, and further reduce radar detection performance.
According to the radar communication integration scheme based on the OFDM comb spectrum, a single-symbol discrete spectrum and a time domain real part of the radar communication integration signal based on the OFDM comb spectrum are shown in fig. 6 and fig. 7 respectively. The simulation results of the radar communication integrated signal based on the OFDM comb spectrum are shown in fig. 8 and 9 respectively, and according to fig. 8, it can be known that the signal inherits the excellent side lobe performance of the LFM. Pulse pressure side lobes are lower and no spurious peaks exist. The radar function can obtain 1.33m radar resolution under the condition of sharing 100MHz with the airspace at the same time as the communication function. As can be seen from fig. 9, the signal also satisfies the requirement of high-speed wireless communication. Under the condition of sharing 100MHz with radar in the same space domain, the communication data rate and the error rate are 288Mbps and 10 respectively -5 。
The simulation shows that compared with the existing method, the method provided by the invention can give consideration to contradictory requirements of radar and communication on signals under the condition that the radar and communication share spectrum resources in the same airspace.
Fig. 10 schematically illustrates a block diagram of a radar communication integrated apparatus based on OFDM signals according to an embodiment of the present disclosure.
The embodiment of the disclosure also provides a radar communication integrated device 1000 based on OFDM comb spectrum, including: the system comprises a parameter setting module 1010, a subcarrier allocation module 1020, a signal modulation module 1030 and a radar communication integration module 1040.
The parameter setting module 1010 is configured to set parameters of an OFDM comb spectrum signal integrated with radar communication, and obtain a subcarrier set of the OFDM comb spectrum signal;
a subcarrier allocation module 1020, configured to divide the subcarrier set into a comb-shaped first subcarrier set and a comb-shaped second subcarrier set, where the first subcarrier set is occupied by a radar signal and the second subcarrier set is occupied by a communication signal;
a signal modulation module 1030, configured to modulate the radar signal into a weight of the first subcarrier set, and modulate the communication signal into a weight of a second subcarrier set;
the radar communication integration module 1040 is configured to combine the weights of the first subcarrier set and the weights of the second subcarrier set to form the OFDM comb spectrum signal.
It is understood that the parameter setting module 1010, the subcarrier allocation module 1020, the signal modulation module 1030, and the radar communication integration module 1040 may be combined in one module to be implemented, or any one of the modules may be split into a plurality of modules. Alternatively, at least some of the functionality of one or more of the modules may be combined with at least some of the functionality of other modules and implemented in one module. At least one of the parameter setting module 1010, the subcarrier allocation module 1020, the signal modulation module 1030, the radar communication integration module 1040 may be implemented at least in part as hardware circuitry, such as a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), a system on a chip, a system on a substrate, a system on a package, an Application Specific Integrated Circuit (ASIC), or any other reasonable manner of integrating or packaging the circuitry, or as hardware or firmware, or as a suitable combination of software, hardware, and firmware implementations, in accordance with embodiments of the present invention. Alternatively, at least one of the parameter setting module 1010, the subcarrier allocation module 1020, the signal modulation module 1030, and the radar communication integration module 1040 may be at least partially implemented as a computer program module, which may perform the functions of the corresponding module when the program is run by a computer.
Fig. 11 schematically illustrates a block diagram of an electronic device according to an embodiment of the disclosure.
As shown in fig. 11, the electronic apparatus described in the present embodiment includes: electronic device 400 includes processor 410, computer-readable storage medium 420. The electronic device 400 may perform the method described above with reference to fig. 1 to enable detection of a particular operation.
In particular, processor 410 may include, for example, a general purpose microprocessor, an instruction set processor and/or an associated chipset and/or a special purpose microprocessor (e.g., an Application Specific Integrated Circuit (ASIC)), or the like. Processor 410 may also include on-board memory for caching purposes. Processor 410 may be a single processing unit or a plurality of processing units for performing different actions in accordance with the method flow described with reference to fig. 1 in accordance with an embodiment of the disclosure.
The computer-readable storage medium 420 may be, for example, any medium that can contain, store, communicate, propagate, or transport the instructions. For example, a readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, device, or propagation medium. Specific examples of the readable storage medium include: magnetic storage devices such as magnetic tape or hard disk (HDD); optical storage devices such as compact discs (CD-ROMs); a memory, such as a Random Access Memory (RAM) or a flash memory; and/or a wired/wireless communication link.
The computer-readable storage medium 420 may include a computer program 421, which computer program 421 may include code/computer-executable instructions that, when executed by the processor 410, cause the processor 410 to perform the method flow as described above in connection with fig. 1 and any variations thereof.
The computer program 421 may be configured with computer program code comprising, for example, computer program modules. For example, in an example embodiment, code in computer program 421 may include one or more program modules, including 421A, module 421B, … …, for example. It should be noted that the division and number of modules is not fixed, and that a person skilled in the art may use suitable program modules or combinations of program modules according to the actual situation, which when executed by the processor 410, enable the processor 410 to perform, for example, the method flows and any variations thereof described above in connection with fig. 1-2.
At least one of the parameter setting module 1010, the subcarrier allocation module 1020, the signal modulation module 1030, the radar communication integration module 1040 may be implemented as a computer program module described with reference to fig. 11, which when executed by the processor 410, may implement the respective operations described above, according to an embodiment of the invention.
The present disclosure also provides a computer-readable medium that may be embodied in the apparatus/device/system described in the above embodiments; or may exist alone without being assembled into the apparatus/device/system. The computer readable medium carries one or more programs which, when executed, implement methods in accordance with embodiments of the present disclosure.
Those skilled in the art will appreciate that the features recited in the various embodiments of the disclosure and/or in the claims may be provided in a variety of combinations and/or combinations, even if such combinations or combinations are not explicitly recited in the disclosure. In particular, the features recited in the various embodiments of the present disclosure and/or the claims may be variously combined and/or combined without departing from the spirit and teachings of the present disclosure. All such combinations and/or combinations fall within the scope of the present disclosure.
While the present disclosure has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. The scope of the disclosure should, therefore, not be limited to the above-described embodiments, but should be determined not only by the following claims, but also by the equivalents of the following claims.
Claims (8)
1. An OFDM signal-based radar communication integration method, comprising:
setting parameters of an OFDM comb spectrum signal integrated with radar communication to obtain a subcarrier set of the OFDM comb spectrum signal;
dividing the subcarrier set into a comb-shaped first subcarrier set and a comb-shaped second subcarrier set, wherein the first subcarrier set is occupied by radar signals, and the second subcarrier set is occupied by communication signals;
modulating the radar signal into the weight of the first subcarrier set, and modulating the communication signal into the weight of the second subcarrier set;
combining the weight of the first subcarrier set and the weight of the second subcarrier set to form the OFDM comb spectrum signal;
the modulating the radar signal into weights for the first set of subcarriers includes:
acquiring a discrete time domain representation of the radar signal, wherein the data length of the discrete time domain representation of the radar signal is N/S, N represents the total number of subcarriers, and S represents the subcarrier interval of a first subcarrier set;
zero padding is carried out on the discrete time domain representation of the radar signal, and the data length of the discrete time domain representation is padded to N;
performing discrete Fourier transform on the discrete time domain representation of the radar signal after zero padding to obtain a discrete spectrum value of the radar signal, wherein the length is N;
taking a value located at the frequency point of the first subcarrier set in the discrete spectrum value of the radar signal as a weight of the first subcarrier set;
the modulating the communication signal into weights of a second set of subcarriers includes:
performing channel coding and QAM modulation on the communication signal;
adding a pilot signal to the communication signal after modulation and coding, and taking the communication signal as a weight of a second subcarrier set;
wherein, the pilot signal is used for estimating the channel response when processing the communication signal after the OFDM comb spectrum signal is received by the receiving end.
2. The method of claim 1 wherein the parameters of the OFDM comb spectrum signal include at least a bandwidth B, a symbol effective time width T, a sub-Band width Δf, cyclic prefix time width T CP The total time width T' of the symbol is T+T CP The total number of subcarriers N is BT, and the subcarrier set a of the OFDM comb spectrum signal is denoted { i·Δf, i=0, 1,2, …, N-1}; setting a subcarrier spacing S of the first subcarrier set, then the first subcarrier set a R For { i.S.DELTA.f, i=0, 1,2, …, N/S-1}, the second set of subcarriers A C Is A-A R The method comprises the steps of carrying out a first treatment on the surface of the The time width of the radar signal is T/S, the bandwidth is B, and the frequency K is adjusted r The value is BS/T.
3. The method of claim 1, wherein combining the weights of the first set of subcarriers and the weights of the second set of subcarriers to form the OFDM comb spectrum signal comprises:
taking the union of the weight of the first subcarrier set and the weight of the second subcarrier set to obtain the frequency spectrum of the OFDM comb spectrum signal;
and transforming the frequency spectrum of the OFDM comb spectrum signal to a time domain, and adding a cyclic prefix to form the OFDM comb spectrum signal.
4. A method according to claim 3, characterized in that the method further comprises:
removing the cyclic prefix in the OFDM comb spectrum signal after the OFDM comb spectrum signal is received by a receiving end;
transforming the OFDM comb spectrum signal to a discrete frequency domain;
and separating the weight of the first subcarrier set and the weight of the second subcarrier set from the transformed OFDM comb spectrum signal, wherein the weight of the first subcarrier set is the data of the radar signal, and the weight of the second subcarrier set is the data of the communication signal.
5. The method according to claim 4, wherein the method further comprises:
processing the data of the radar signal by using a radar processing algorithm to obtain radar detection information contained in the radar signal;
and processing the data of the communication signal by using a communication processing method to obtain communication transmission information contained in the communication signal.
6. An OFDM signal-based radar communication integration apparatus, comprising:
the parameter setting module is used for setting parameters of the OFDM comb spectrum signal integrated with radar communication to obtain a subcarrier set of the OFDM comb spectrum signal;
the subcarrier allocation module is used for dividing the subcarrier set into a comb-shaped first subcarrier set and a comb-shaped second subcarrier set, wherein the first subcarrier set is occupied by radar signals, and the second subcarrier set is occupied by communication signals;
the signal modulation module is used for modulating the radar signal into the weight of the first subcarrier set and modulating the communication signal into the weight of the second subcarrier set;
the radar communication integrated module is used for combining the weight of the first subcarrier set and the weight of the second subcarrier set to form the OFDM comb spectrum signal;
the modulating the radar signal into weights for the first set of subcarriers includes:
acquiring a discrete time domain representation of the radar signal, wherein the data length of the discrete time domain representation of the radar signal is N/S, N represents the total number of subcarriers, and S represents the subcarrier interval of a first subcarrier set;
zero padding is carried out on the discrete time domain representation of the radar signal, and the data length of the discrete time domain representation is padded to N;
performing discrete Fourier transform on the discrete time domain representation of the radar signal after zero padding to obtain a discrete spectrum value of the radar signal, wherein the length is N;
taking a value located at the frequency point of the first subcarrier set in the discrete spectrum value of the radar signal as a weight of the first subcarrier set;
the modulating the communication signal into weights of a second set of subcarriers includes:
performing channel coding and QAM modulation on the communication signal;
adding a pilot signal to the communication signal after modulation and coding, and taking the communication signal as a weight of a second subcarrier set;
wherein, the pilot signal is used for estimating the channel response when processing the communication signal after the OFDM comb spectrum signal is received by the receiving end.
7. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the OFDM signal based radar communication integration method of any one of claims 1 to 5 when the computer program is executed.
8. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the OFDM signal-based radar communication integration method of any one of claims 1 to 5.
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| CN104811222A (en) * | 2015-04-23 | 2015-07-29 | 西安电子工程研究所 | Design method of radar communication integrated signal |
| CN107490785A (en) * | 2017-09-19 | 2017-12-19 | 电子科技大学 | A kind of OFDM radar-communication integration waveform design methods based on frequency domain zero setting modulation |
| CN109061633A (en) * | 2018-10-19 | 2018-12-21 | 西安电子科技大学 | The Design of Signal method of OFDM radar-communication integration airborne platform system |
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| CN104811222A (en) * | 2015-04-23 | 2015-07-29 | 西安电子工程研究所 | Design method of radar communication integrated signal |
| CN107490785A (en) * | 2017-09-19 | 2017-12-19 | 电子科技大学 | A kind of OFDM radar-communication integration waveform design methods based on frequency domain zero setting modulation |
| CN109061633A (en) * | 2018-10-19 | 2018-12-21 | 西安电子科技大学 | The Design of Signal method of OFDM radar-communication integration airborne platform system |
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