CN115514390B - Method, device and storage medium for generating frame structure of high-speed frequency hopping system - Google Patents
Method, device and storage medium for generating frame structure of high-speed frequency hopping system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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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
- H04L27/2602—Signal structure
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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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application discloses a design method, a device and a storage medium of a frame structure of a high-speed frequency hopping system, relates to the technical field of frequency hopping communication, and solves the problems that in the prior art, the probability of successful frame synchronization of a receiving end is low, and the complexity of a synchronization algorithm corresponding to a transmitting end frame structure is high. The method comprises the following steps: modulating a transmission signal to obtain transmission data; performing differential coding on the original PN sequence, and recombining the PN sequence subjected to differential coding according to rules to determine a recombination code; and inserting the recombination codes into the transmission data according to the frequency hopping frame structure to determine a transmission sequence. The method realizes the effects of low complexity of the frame synchronization algorithm, high synchronization processing efficiency, and strong anti-interference capability under the condition of serious human interference.
Description
Technical Field
The present application relates to the field of frequency hopping communications technologies, and in particular, to a method and apparatus for generating a frame structure of a high-speed frequency hopping system, and a storage medium.
Background
The frequency hopping spread spectrum technology is to perform discrete hopping on the carrier frequency of a traditional narrow-band modulation signal under the control of a pseudo-random sequence, so as to realize a spread spectrum mode of spectrum spreading. With the development of frequency hopping technology, the electromagnetic environment facing the frequency hopping technology is more and more complex, the interfered frequency and the interference degree of a communication system are greatly increased, the high-speed frequency hopping technology is an effective measure for resisting interference, and the high-speed frequency hopping technology is to improve the frequency hopping rate on the basis of the original frequency hopping system, so that the residence time of each frequency hopping is smaller than the sum of the processing forwarding time and the propagation delay of an jammer, and further malicious interference is avoided.
However, the high-speed frequency hopping system requires high frequency modulation frequency and also requires high transmission speed and data processing speed at the receiving end. At present, the existing method only relies on detecting the correlation peak of the synchronous sequence to judge the synchronization, once the sequence is interfered by aiming, the correlation characteristic of the sequence is seriously destroyed, the probability of successful synchronization of a receiving end is obviously reduced, and the communication is interrupted.
Disclosure of Invention
The embodiment of the application solves the problems of low probability of successful frame synchronization of a receiving end and high complexity of a synchronization algorithm corresponding to a transmitting end frame structure in the prior art by providing the method, the device and the storage medium for generating the frame structure of the high-speed frequency hopping system, realizes low complexity of the frame synchronization algorithm, has high synchronization processing efficiency, and can still realize the effects of frame synchronization and strong anti-interference capability under the condition of serious human interference.
In a first aspect, an embodiment of the present application provides a method for generating a frame structure of a high-speed frequency hopping system, where the method includes:
modulating a transmission signal to obtain transmission data;
performing differential coding on an original PN sequence, and recombining the PN sequence subjected to differential coding according to rules to determine a recombination code;
and inserting the recombined codes into the transmission data according to a frequency hopping frame structure to determine a transmission sequence.
With reference to the first aspect, in one possible implementation manner, the modulating the transmission signal includes:
encoding the transmission signal by adopting a low code rate channel;
carrying out whole-frame random interleaving on the encoded transmission signal;
mapping the interleaved transmission signals to determine the transmission data.
With reference to the first aspect, in one possible implementation manner, the original PN sequence is differentially encoded according to the following formula:wherein d is k Representing the PN code after differential coding, c k Representing said original PN code,>representing exclusive or.
With reference to the first aspect, in one possible implementation manner, the inserting the reorganization code into the transmission data according to a frequency hopping frame structure includes: and equally dividing the recombined codes and periodically inserting the recombined codes into the transmission data.
With reference to the first aspect, in one possible implementation manner, the frequency hopping frame structure includes: time hopping, power control, synchronization sequences, and the transmission data.
In a second aspect, an embodiment of the present application provides a device for generating a frame structure of a high-speed frequency hopping system, which is characterized by including:
the transmission signal processing module is used for modulating the transmission signal to acquire transmission data;
the PN sequence processing module is used for carrying out differential coding on an original PN sequence, recombining the PN sequence subjected to differential coding according to a rule and determining a recombination code;
and the output module is used for inserting the recombined codes into the transmission data according to a frequency hopping frame structure and determining a transmission sequence.
With reference to the second aspect, in one possible implementation manner, the transmit signal processing module is configured to:
encoding the transmission signal by adopting a low code rate channel;
carrying out whole-frame random interleaving on the encoded transmission signal;
mapping the interleaved transmission signals to determine the transmission data.
With reference to the second aspect, in one possible implementation manner, the PN sequence processing module differentially encodes an original PN sequence according to the following formula:wherein d is k Representing the PN code after differential coding, c k Representing said original PN code,>representing exclusive or.
With reference to the second aspect, in one possible implementation manner, the output module equally divides the recombined codes and periodically inserts the divided codes into the transmission data.
With reference to the second aspect, in one possible implementation manner, the frequency hopping frame structure in the output module includes: time hopping, power control, synchronization sequences, and the transmission data.
In a third aspect, an embodiment of the present application provides a wireless communication device, the device including a memory and a processor;
the memory is used for storing computer executable instructions;
the processor is configured to execute the computer-executable instructions to implement the method of any one of the first aspect and the first aspect.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium storing executable instructions that when executed by a computer enable the method of any one of the first aspect and the first aspect.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
the embodiment of the application adopts a method, a device and a storage medium for generating a frame structure of a high-speed frequency hopping system, and the method comprises the steps of modulating a sending signal to acquire transmission data; performing differential coding on the original PN sequence, and recombining the PN sequence subjected to differential coding according to rules to determine a recombination code; and inserting the recombination codes into the transmission data according to the frequency hopping frame structure to determine a transmission sequence. And carrying out differential operation on the original PN code, and correspondingly carrying out differential operation when the receiving end is synchronous, so that the synchronous algorithm is insensitive to frequency offset and phase shift. Meanwhile, the timing synchronization and the information carrier information sharing can be realized, the frequency offset estimation is not needed to be additionally carried out, the algorithm complexity is low, and the synchronization processing efficiency is high. In the method, a multidimensional combined anti-interference technology combining a frequency domain, a code domain and a time domain is adopted for a transmission sequence, high-speed frequency hopping is adopted on the frequency domain, high-performance low-code rate channel coding is adopted on the code domain, a random interleaver is adopted on the time domain, and the anti-interference capability is strong. The method effectively solves the problems that in the prior art, the probability of successful frame synchronization of a receiving end is low, the complexity of a synchronization algorithm corresponding to a frame structure of a transmitting end is high, the complexity of the frame synchronization algorithm is low, the synchronization processing efficiency is high, and the frame synchronization and the anti-interference capability are high under the condition of serious human interference.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments of the present application or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of method steps provided by an embodiment of the present application;
FIG. 2 is a flowchart of a synchronization sequence generation according to an embodiment of the present application;
fig. 3 is a schematic diagram of a generating device of a frame structure of a high-speed frequency hopping system according to an embodiment of the present application;
fig. 4 is a schematic diagram of a wireless communication device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The frequency hopping spread spectrum technology is to perform discrete hopping on the carrier frequency of a traditional narrow-band modulation signal under the control of a pseudo-random sequence, so as to realize a spread spectrum mode of spectrum spreading. With the wider and wider application of frequency hopping technology, the electromagnetic environment faced by the frequency hopping technology is more and more complex, the probability of being interfered by a communication system and the interference degree are greatly increased, and the important consideration is needed to be given to how to resist various malicious interferences, so that the normal application of a communication link is ensured.
High-speed frequency hopping is an effective measure against malicious interference. The method is to increase the frequency hopping rate based on the original frequency hopping system, so that the residence time of each hop is smaller than the sum of the processing forwarding time and the propagation delay of the interference party jammer. In this way, when the interfering signal arrives, the frequency hopping receiver has already begun to receive the next hop, thereby avoiding malicious interference.
The high-speed frequency hopping system also provides higher requirements for the information transmission rate and the data processing speed of the receiving end while requiring high frequency hopping frequency. The frame structure adopted at present is mostly composed of pilot frequency and data, and when the hop count of a signal is determined, the information transmission rate depends on the information amount carried by each hop and the transmission efficiency. How to obtain better performance with the smallest possible number of pilots is actually how to design a frame structure that is more superior to the performance of the high-speed frequency hopping system. In a high-speed frequency hopping system, the frequency hopping rate is more than 1000hops/s, so that all signal processing of each hop of a receiving end is required to be completed within 1ms, the data processing time is very limited, and the requirement on the calculation speed is put forward on a synchronous algorithm. Therefore, it is necessary to reduce the complexity of timing synchronization as much as possible, reduce the time consumption of the synchronization process, and further increase the processing speed of the receiving end.
The synchronization method based on the training sequence is a timing synchronization method widely used in frequency hopping communication. The method utilizes the characteristics of sharp self-correlation curve and low cross correlation of the training sequence, and can realize accurate synchronization of the received signals. Moreover, due to the good pseudo-randomness of the training sequence, the method can better resist broadband interference. However, the method only relies on detecting the correlation peak of the synchronization sequence to determine synchronization, and once the sequence is interfered by aiming, the original correlation characteristic of the sequence is seriously destroyed, and the success probability of synchronization of a receiving end is obviously reduced, thereby causing communication interruption.
Therefore, it is required to find a frame design of a high-speed frequency hopping communication system suitable for an electronic countermeasure environment, and the complexity of a synchronization algorithm corresponding to the frame structure is required to be low.
In view of the problems existing in the prior art, an embodiment of the present application provides a method for generating a frame structure of a high-speed frequency hopping system, which includes the following steps S101 to S103. The process is schematically shown in FIG. 1. Fig. 2 is a flowchart of the synchronization sequence generation provided by the present application.
S101, modulating a transmission signal to obtain transmission data.
S102, performing differential coding on the original PN sequence, and recombining the PN sequence subjected to differential coding according to rules to determine a recombination code.
S103, inserting the recombined codes into transmission data according to the frequency hopping frame structure, and determining a transmission sequence.
The method provided by the application is a frame structure of a distributed synchronization method, the receiving end is combined with each jump to finish timing synchronization, and under the condition of serious artificial interference, the frame synchronization can be still realized to finish normal communication of the receiving and transmitting sides. When the synchronization sequence is generated, differential operation is carried out on the original PN code, and when the receiving end is synchronized, differential operation is needed to be correspondingly carried out, so that the synchronization algorithm is insensitive to frequency offset and phase shift. Meanwhile, the method can realize the sharing of timing synchronization and information carrier synchronization information, does not need to additionally carry out frequency offset estimation, has low algorithm complexity and high synchronization processing efficiency, and is suitable for various high-speed frequency hopping systems. The transmitting signal adopts multidimensional combined anti-interference technology combining a frequency domain, a code domain and a time domain, the frequency domain adopts high-speed frequency hopping, the code domain adopts high-performance low-code rate channel coding, and the time domain adopts a random interleaver, so that the anti-interference capability is strong.
Let the total length of the communication frame be L, the time-hopping length be L1, and the power control length be L2, the total length for transmitting the synchronization sequence and the data portion be n×lblock, N is the total number of hops for synchronization and data transmission, lblock is the length of each hop. Each hop consists of hopping switching and regular interval insertion of data blocks into M pilot blocks, lblock=lswitch+m×ls+ (M-1) ×ld. Lswitch is the length of the frequency hopping switch, ls is a small pilot length, and Ld is a small data length.
In step S101, modulating the transmission signal includes: coding the transmission signal by adopting a low code rate channel; the encoded transmission signal is subjected to whole-frame random interleaving; mapping the interleaved transmission signals to determine transmission data. Wherein the total length of the transmission signal is (M-1) Ld N.
The low code rate channel coding of the transmission signal can realize the functions of self-adaptive equalization, diversity and frequency hopping of the channel, and the modulated transmission signal can ensure that the mobile communication system works normally under the multipath and fading channel conditions.
In step S102, a reference bit d0 is set to 0 for an original PN code having a length (M-1) Ld N, and the original PN code is differentially encoded on a bit-by-bit basis. The original PN sequence is differentially encoded according to the following formula:wherein d is k Representing the differentially encoded PN code, c k Representing the original PN code, ">Representing exclusive or.
In step S103, inserting the reorganization code into the transmission data according to the frequency hopping frame structure includes: and equally dividing the recombined codes and periodically inserting the recombined codes into transmission data. And recombining the PN codes after differential coding according to rules. The reorganization rule is that M bits are a group, and the last bit of the previous group is the same as the first bit of the next group, namely the head and tail are the same, namely expressed as:
generating PN code with length of Ls as spreading code, and performing Ls times spread spectrum on recombined sequence with length of MxN to obtain synchronous sequence with length of LsMxN.
And the transmission data is periodically adjusted, so that the synchronization algorithm is insensitive to frequency offset and phase shift, and the sharing of timing synchronization information carrier information is realized. The frequency offset estimation is not needed to be additionally carried out, the complexity of the algorithm is greatly reduced, the time for processing the information is saved, and the synchronous processing efficiency is high.
Although the application provides method operational steps as described in the examples or flowcharts, more or fewer operational steps may be included based on conventional or non-inventive labor. The order of steps recited in the present embodiment is only one way of performing the steps in a plurality of steps, and does not represent a unique order of execution. When implemented by an actual device or client product, the method of the present embodiment or the accompanying drawings may be performed sequentially or in parallel (e.g., in a parallel processor or a multithreaded environment).
The embodiment of the application provides a generating device 300 of a frame structure of a high-speed frequency hopping system, which, as shown in fig. 3, comprises: a transmit signal processing module 301, a PN sequence processing module 302, and an output module 303.
The transmit signal processing module 301 is configured to modulate a transmit signal to obtain transmission data. The transmission signal processing module 301 is configured to: coding the transmission signal by adopting a low code rate channel; the encoded transmission signal is subjected to whole-frame random interleaving; mapping the interleaved transmission signals to determine transmission data.
The PN sequence processing module 302 is configured to differentially encode an original PN sequence, and recombine the differentially encoded PN sequence according to a rule, so as to determine a reconfiguration code. The PN sequence processing module 302 differentially encodes the original PN sequence according to the following formula:wherein d is k Representing the differentially encoded PN code, c k Representing the original PN code, ">Representing exclusive or.
And the output module 303 is configured to insert the reorganization code into the transmission data according to the frequency hopping frame structure, and determine a transmission sequence. The output module 303 equally divides the recombined codes and periodically inserts the codes into the transmission data. The frequency hopping frame structure includes: time hopping, power control, synchronization sequences, and transmission data.
In the device provided by the application, the transmission signal is firstly transmitted to the transmission signal processing module 301, the transmission data is encoded according to a specific frame structure, and the transmission data generated after encoding is insensitive to frequency offset and phase shift and can normally work under the channel conditions of multipath and fading. In the PN sequence processing module 302, the original PN sequence is first subjected to two operations, i.e., differential encoding and direct sequence spreading, to generate a synchronization sequence. The output module 303 equally divides the synchronization sequence and inserts it into the transmission data.
The apparatus or module set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. For convenience of description, the above devices are described as being functionally divided into various modules, respectively. The functions of the various modules may be implemented in the same piece or pieces of software and/or hardware when implementing the present application. Of course, a module that implements a certain function may be implemented by a plurality of sub-modules or a combination of sub-units.
The methods, apparatus or modules described in this application may be implemented in computer readable program code means and the controller may be implemented in any suitable way, for example, the controller may take the form of a microprocessor or processor and a computer readable medium storing computer readable program code (e.g. software or firmware) executable by the (micro) processor, logic gates, switches, application specific integrated circuits (english: application Specific Integrated Circuit; abbreviated: ASIC), programmable logic controller and embedded microcontroller, examples of the controller including but not limited to the following microcontrollers: ARC 625D, atmel AT91SAM, microchip PIC18F26K20, and Silicone Labs C8051F320, the memory controller may also be implemented as part of the control logic of the memory. Those skilled in the art will also appreciate that, in addition to implementing the controller in a pure computer readable program code, it is well possible to implement the same functionality by logically programming the method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc. Such a controller can be regarded as a hardware component, and means for implementing various functions included therein can also be regarded as a structure within the hardware component. Or even means for achieving the various functions may be regarded as either software modules implementing the methods or structures within hardware components.
Some of the modules of the apparatus of the present application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, classes, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
An embodiment of the present application provides a wireless communication device, as shown in fig. 4, comprising a memory 401 and a processor 402; memory 401 is used to store computer-executable instructions; the processor 402 is configured to execute computer-executable instructions to implement a method of designing a frame structure of a high-speed frequency hopping system and a method of any one of the methods of designing a frame structure of a high-speed frequency hopping system.
The embodiment of the application provides a computer readable storage medium, wherein the computer readable storage medium stores executable instructions, and the computer executes the executable instructions to realize a method for designing a frame structure of a high-speed frequency hopping system and a method for designing any one of the frame structures of the high-speed frequency hopping system.
The storage medium includes, but is not limited to, a random access Memory (English: random Access Memory; RAM), a Read-Only Memory (ROM), a Cache Memory (English: cache), a Hard Disk (English: hard Disk Drive; HDD), or a Memory Card (English: memory Card). The memory may be used to store computer program instructions.
From the above description of embodiments, it will be apparent to those skilled in the art that the present application may be implemented in software plus necessary hardware. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product or may be embodied in the implementation of data migration. The computer software product may be stored on a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., comprising instructions for causing a computer device (which may be a personal computer, mobile terminal, server, or network device, etc.) to perform the methods described in the various embodiments or portions of the embodiments of the application.
In this specification, each embodiment is described in a progressive manner, and the same or similar parts of each embodiment are referred to each other, and each embodiment is mainly described as a difference from other embodiments. All or portions of the present application are operational with numerous general purpose or special purpose computer system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet devices, mobile communication terminals, multiprocessor systems, microprocessor-based systems, programmable electronic devices, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the present application; although the application 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 scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (5)
1. The method for generating the frame structure of the high-speed frequency hopping system is characterized by comprising the following steps of:
modulating a transmission signal to obtain transmission data; the modulating the transmission signal includes:
encoding the transmission signal by adopting a low code rate channel; carrying out whole-frame random interleaving on the encoded transmission signal; mapping the interleaved transmission signals to determine the transmission data;
performing differential coding on an original PN sequence, and recombining the PN sequence subjected to differential coding according to rules to determine a recombination code; the reorganization rule is that M bits are a group, and the last bit of the previous group is the same as the first bit of the next group; m represents the number of pilot blocks per hop;
the original PN sequence is differentially encoded according to the following formula:wherein the method comprises the steps of dk Representing the PN code after differential encoding, ck representing said original PN code,>representing exclusive OR;
inserting the recombined codes into the transmission data according to a frequency hopping frame structure to determine a transmission sequence; the inserting the reorganization code into the transmission data according to the frequency hopping frame structure comprises the following steps: and equally dividing the recombined codes and periodically inserting the recombined codes into the transmission data.
2. The method of claim 1, wherein the frequency hopping frame structure comprises: time hopping, power control, synchronization sequences, and the transmission data.
3. A generation apparatus for a frame structure of a high-speed frequency hopping system, comprising:
the transmission signal processing module is used for modulating the transmission signal to acquire transmission data; the transmission signal processing module is used for: encoding the transmission signal by adopting a low code rate channel; carrying out whole-frame random interleaving on the encoded transmission signal; mapping the interleaved transmission signals to determine the transmission data;
the PN sequence processing module is used for carrying out differential coding on an original PN sequence, recombining the PN sequence subjected to differential coding according to a rule and determining a recombination code; the reorganization rule is that M bits are a group,and the last bit of the previous group is the same as the first bit of the next group; m represents the number of pilot blocks per hop; the PN sequence processing module differentially encodes the original PN sequence according to the following formula:wherein the method comprises the steps of dk Representing the PN code after differential encoding, ck representing said original PN code,>representing exclusive OR;
the output module is used for inserting the recombined codes into the transmission data according to a frequency hopping frame structure to determine a transmission sequence, equally dividing the recombined codes by the output module, and periodically inserting the recombined codes into the transmission data.
4. A wireless communication device comprising a memory and a processor;
the memory is used for storing computer executable instructions;
the processor is configured to execute the computer-executable instructions to implement the method of any of claims 1-2.
5. A computer readable storage medium storing executable instructions which when executed by a computer enable the method of any one of claims 1-2 to be carried out.
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