CN111541516B - Channel code identification method, device, electronic device and storage medium - Google Patents
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- CN111541516B CN111541516B CN202010304256.7A CN202010304256A CN111541516B CN 111541516 B CN111541516 B CN 111541516B CN 202010304256 A CN202010304256 A CN 202010304256A CN 111541516 B CN111541516 B CN 111541516B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
- H04L1/0021—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach in which the algorithm uses adaptive thresholds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
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- Y02D30/00—Reducing energy consumption in communication networks
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Abstract
The application relates to a channel code identification method, a device, an electronic device and a storage medium, wherein the method comprises the following steps: the method comprises the steps of obtaining a first binary bit stream of an L-band satellite communication signal to be identified and a modulation mode of the L-band satellite communication signal, wherein the L-band satellite communication signal is obtained after channel coding, modulation, channel transmission and demodulation of a second binary bit stream of an original communication signal, and the channel coding mode comprises the following steps: VTB, TCM, TPC, LDPC and versafc; performing level conversion on the first binary bit stream according to the modulation mode to obtain a third binary bit stream; deblurring the third binary bit stream to obtain a fourth binary bit stream; performing frame length estimation on the fourth binary bit stream to obtain frame length parameters; and identifying the channel coding of the L-band satellite communication signal according to the frame length parameter and the modulation mode. The method can effectively identify the channel coding mode of the L-band satellite communication signals.
Description
Technical Field
The present invention relates to the field of communication signal processing technologies, and in particular, to a channel code identification method, a device, an electronic device, and a storage medium.
Background
In long-range wireless signal transmission, especially in satellite communication systems, it is often necessary to modulate the signal to be transmitted in order to achieve long-range transmission. Moreover, satellite signal transmission often employs different channel coding techniques to improve the stability and reliability of data transmission.
Currently, the channel coding scheme adopted in L-band satellite signal transmission includes: viterbi (VTB), trellis (Trellis Coded Modulation, TCM), turbo product code (Turbo Product code, TPC), low-density Parity-check (LDPC), versfec, etc. Before data decoding, the coding mode of the channel needs to be identified first, and the diversity of the channel coding increases the difficulty of analysis and processing for the receiving end of the satellite communication system. The current channel coding identification method for the L band is lack of a complete scheme.
Disclosure of Invention
The application provides a channel code identification method, a device, an electronic device and a storage medium, which are used for solving the technical problem that an integral identification scheme is lacking for the channel code of an L-band at present.
A first aspect of the present application provides a channel code identification method for identifying a channel code of an L-band satellite communication signal, the method comprising:
acquiring a first binary bit stream of an L-band satellite communication signal to be identified and a modulation mode of the L-band satellite communication signal, wherein the L-band satellite communication signal is obtained by performing channel coding, modulation, channel transmission and demodulation on a second binary bit stream of an original communication signal, and the coding mode of the channel coding comprises the following steps: VTB, TCM, TPC, LDPC and versafc;
performing level conversion on the first binary bit stream according to the modulation mode to obtain a third binary bit stream;
performing deblurring processing on the third binary bit stream to obtain a fourth binary bit stream;
performing frame length estimation on the fourth binary bit stream to obtain frame length parameters;
and identifying the channel coding mode of the L-band satellite communication signal according to the frame length parameter and the modulation mode.
Further, the performing frame length estimation on the fourth binary bit stream to obtain a frame length parameter includes:
acquiring a frame header of the fourth binary bit stream;
determining a frame header type of the frame header;
determining frame length data of the binary bit stream according to the frame header type;
and determining the frame header and the frame length data as frame length parameters.
Further, the identifying the channel code of the L-band satellite communication signal according to the frame length parameter includes:
calculating composite values corresponding to different coding rates according to the frame length parameters and the modulation modes;
and identifying the channel code of the L-band satellite communication signal according to the composite value.
A second aspect of the present application provides a channel code identification apparatus for identifying a channel code of an L-band satellite communication signal, the apparatus comprising:
the system comprises an acquisition module, a channel coding module and a demodulation module, wherein the acquisition module is used for acquiring a first binary bit stream of an L-band satellite communication signal to be identified and a modulation mode of the L-band satellite communication signal, the L-band satellite communication signal is obtained after channel coding, modulation, channel transmission and demodulation of a second binary bit stream of an original communication signal, and the coding mode of the channel coding comprises: VTB, TCM, TPC, LDPC and versafc;
the level conversion module is used for carrying out level conversion on the first binary bit stream according to the modulation mode to obtain a third binary bit stream;
the deblurring module is used for carrying out deblurring processing on the third binary bit stream to obtain a fourth binary bit stream;
the frame length estimation module is used for carrying out frame length estimation on the fourth binary bit stream to obtain frame length parameters;
and the identification module is used for identifying the channel coding mode of the L-band satellite communication signal according to the frame length parameter and the modulation mode.
A third aspect of the present application provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable by the processor, the processor implementing the steps of any one of the methods provided in the first aspect when the computer program is executed.
A fourth aspect of the present application provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any one of the methods provided in the first aspect.
As can be seen from the foregoing embodiments of the present application, the channel code identification method provided in the present application is used for identifying a channel code of an L-band satellite communication signal, and the method includes: the method comprises the steps of obtaining a first binary bit stream of an L-band satellite communication signal to be identified and a modulation mode of the L-band satellite communication signal, wherein the L-band satellite communication signal is obtained after channel coding, modulation, channel transmission and demodulation of a second binary bit stream of an original communication signal, and the channel coding mode comprises the following steps: VTB, TCM, TPC, LDPC and versafc; performing level conversion on the first binary bit stream according to the modulation mode to obtain a third binary bit stream; deblurring the third binary bit stream to obtain a fourth binary bit stream; performing frame length estimation on the fourth binary bit stream to obtain frame length parameters; and identifying the channel coding of the L-band satellite communication signal according to the frame length parameter and the modulation mode. The method comprises the steps of carrying out level conversion, deblurring and frame length estimation on a binary bit stream of an L-band satellite communication signal to obtain frame length parameters; and the method can effectively identify the channel coding mode of the L-band satellite communication signals.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a flow chart of a channel coding identification method provided in an embodiment of the present application;
FIG. 2 is a flow chart of an L-band satellite communication system;
FIG. 3 is a diagram of channel coding recognition results;
fig. 4 is a schematic structural diagram of a channel code identification device according to an embodiment of the present application.
Detailed Description
In order to make the objects, features and advantages of the present application more obvious and understandable, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
As shown in fig. 1, a flow chart of a channel code identification method provided in an embodiment of the present application is shown, where the method includes the following steps:
In the embodiment of the present application, when receiving an L-band satellite communication signal, it is necessary to identify the channel coding scheme of the satellite communication signal. First, it can be understood that the process of transmitting and receiving the L-band satellite communication signal to be identified is shown in fig. 2, and is a schematic flow chart of the L-band satellite communication system, and the flow chart includes the following steps:
specifically, the binary bit stream of the data of the signal to be transmitted is denoted as b= [ b ] 1 ,…,b K ]The binary bit stream is channel coded in a manner that includes: VTB, TCM, TPC, LDPC and versfec-1/2, and obtaining a set of coded sequences after channel coding, and marking as:
c＝Φ(b)＝[c 1 ,…,c N ]
where Φ (·) is the encoding function and c is the binary bit stream of the encoded data. In the satellite communication signal of the L band, the coding efficiency mainly includes: "1/2","2/3","3/4","4/5","5/6","6/7","7/8","5/16","19/24","21/44","0.95","0.79","1/1".
In the embodiment of the present application, the modulation methods for the binary bit stream of the data after the channel coding are as follows: binary phase shift keying (Binary Phase Shift Keying, BPSK), quadrature phase shift keying (Quadrature Phase Shift Keying, QPSK), offset quadrature phase shift keying (offset-QPSK, OQPSK), and 8PSK.
And step 203, transmitting the modulated data.
In the embodiment of the application, after modulating the data, the modulated data is transmitted to the receiving end, and the modulated data is transmitted through a wireless channel.
In the embodiment of the present application, at the receiving end, the soft demodulation information relative to the transmitting end bit stream c is
Wherein the ith code bit c i Soft demodulation information->
The logarithmic posterior probability (posterior loglikelihood ratio, LLR), i.e.:
where r is a vector of data received by the receiving end.
The binary bit stream of the data obtained after demodulation is denoted as the first binary bit stream in step 101, and the binary bit stream b of the original communication signal may be denoted as the second binary bit stream. It is further clarified that the modulation scheme of the L-band satellite communication signal is either BPSK, QPSK, OQPSK or 8PSK.
And 102, performing level conversion on the first binary bit stream according to the modulation mode to obtain a third binary bit stream.
In the embodiment of the present application, for the demodulated first binary bit stream c, level conversion is performed according to the modulation mode thereof, that is:
wherein B before the equal sign is the third binary bit stream, B after the equal sign is the first binary bit stream, its initial value can be assigned 0, n is the left shift number.
And 103, performing deblurring processing on the third binary bit stream to obtain a fourth binary bit stream.
In the embodiment of the application, the influence of interference can generate phase ambiguity in the transmission process of the data. Therefore, after level conversion of the binary bit stream of the channel coding scheme to be identified, the converted binary bit stream needs to be deblurred. Namely:
wherein B preceding the equal sign is the deblurred binary bit stream, i.e. the fourth binary bit stream. B after the equal sign is the third binary bit stream. S is a phase correction parameter. S may be 0x00,0x01,0x02,0x03, etc., depending on deblurring requirements, such as 90 degree fuzzification, 180 degree fuzzification, or 270 degree fuzzification.
And 104, carrying out frame length estimation on the fourth binary bit stream to obtain frame length parameters.
Specifically, performing frame length estimation on the fourth binary bit stream to obtain frame length parameters, including:
acquiring a frame header of a fourth binary bit stream;
determining a frame header type of the frame header;
determining frame length data of the binary bit stream according to the frame header type;
and determining the frame header and the frame length data as frame length parameters.
In the embodiment of the application, the frame length is estimated mainly by counting the repeated rule of bit stream occurrence to obtain the frame header, and then estimating the length of the frame. Specifically, the frame header is counted by the form of the maximum posterior probability, namely:
F＝arg max(p(B))
where F represents the frame header and B is the fourth binary bit stream. The occurrence probability of the 0 and 1 bit streams is counted, so that the occurrence rule of the 0 and 1 bit streams is obtained, and the frame header is estimated. Specifically, the number of times of occurrence of the bit streams of 0 and 1 can be compared and counted through table lookup to obtain the frame header. After the frame header of the fourth binary bit stream is obtained, the frame header type is determined by looking up the table VTB, TCM, TPC, LDPC and VersaFECal, and then the frame header length is determined. The frame length can be calculated by the frame header length, and is specifically as follows:
where L is the length of the frame. The frame length is the key information for carrying out channel coding identification, and the accuracy of frame length estimation directly determines the performance of the channel coding identification of the L-band satellite communication system. The frame header and the frame length data obtained above are collectively referred to as frame length parameters.
And 105, identifying the channel coding of the L-band satellite communication signal according to the frame length parameter and the modulation mode.
In the embodiment of the application, the channel coding mode is judged according to the acquired frame header and frame length data and by combining the modulation mode.
Specifically, identifying channel coding of an L-band satellite communication signal based on frame length parameters includes:
calculating coincidence values corresponding to different coding rates according to the frame length parameters and the modulation modes;
and identifying the channel code of the L-band satellite communication signal according to the coincidence value.
In the embodiment of the application, the corresponding composite value is calculated according to different coding rates, and the maximum composite value is counted from the calculated composite value. If the maximum composite value is greater than 75, the channel coding scheme is a convolutional coding scheme. Here an empirical value of 75 bits of the L-band satellite communication signal. And performing VTB coding mode comparison check sum judgment by adopting a coding mode traversal method, and obtaining a corresponding coding mode and coding code rate according to the frame length and modulation modes BPSK, QPSK, OQPSK and 8PSK traversal check.
If the maximum composite value is less than 75, a further determination is made as to whether it is a TPC or TCM coding scheme. And judging whether the TPC code mode is the TPC code mode according to the frame head, the frame length and the modulation mode table lookup traversal. The frame head and the frame length of the TPC coding mode are compared and checked by looking up the table, if the check is successful, the channel coding mode is TPC coding, and the coding code rate can be output together. If the verification is unsuccessful, determining whether the modulation mode is 8PSK, and if the modulation mode is 8PSK, judging the TCM coding mode. Similarly, the frame header and the frame length of the TCM coding mode can be checked by looking up the table, and if the check is successful, the channel coding mode is determined to be the TCM coding mode, and the coding rate is output together. If the verification is unsuccessful, or the modulation mode is not 8PSK, the identification judgment of other channel coding modes is carried out. And the identification judgment of LDPC and VersaFEC coding modes is carried out until the verification is successful.
The channel code recognition scheme can be realized by C++ programming, when a CDM-625A Signal generator is connected, a received Signal is recognized on a personal computer host, the statistical modulation mode is QPSK, and the channel code recognition accuracy is counted when the satellite communication Signal with the coding rate of 1/2 is obtained, as shown in fig. 3, the channel code recognition result diagram is shown, and when the Signal-to-noise ratio (SNR) is larger than 5DB, the recognition accuracy is larger than 85%.
As can be seen from the foregoing description, the channel code identification method provided in the embodiments of the present application is used for identifying a channel code of an L-band satellite communication signal, and the method includes: the method comprises the steps of obtaining a first binary bit stream of an L-band satellite communication signal to be identified and a modulation mode of the L-band satellite communication signal, wherein the L-band satellite communication signal is obtained after channel coding, modulation, channel transmission and demodulation of a second binary bit stream of an original communication signal, and the channel coding mode comprises the following steps: VTB, TCM, TPC, LDPC and versafc; performing level conversion on the first binary bit stream according to the modulation mode to obtain a third binary bit stream; deblurring the third binary bit stream to obtain a fourth binary bit stream; performing frame length estimation on the fourth binary bit stream to obtain frame length parameters; and identifying the channel coding of the L-band satellite communication signal according to the frame length parameter and the modulation mode. The method comprises the steps of carrying out level conversion, deblurring and frame length estimation on a binary bit stream of an L-band satellite communication signal to obtain frame length parameters; and the method can effectively identify the channel coding mode of the L-band satellite communication signals and can improve the accuracy of channel coding identification.
In another aspect, a channel code identification device is provided, as shown in fig. 4, which is a schematic block diagram of the channel code identification device provided in the embodiment of the present application. The device is used for identifying the channel codes of the L-band satellite communication signals, and comprises:
the obtaining module 401 is configured to obtain a first binary bit stream of an L-band satellite communication signal to be identified and a modulation mode of the L-band satellite communication signal, where the L-band satellite communication signal is obtained by performing channel coding, modulation, channel transmission, and demodulation on a second binary bit stream of an original communication signal, and the coding mode of the channel coding includes: VTB, TCM, TPC, LDPC and versafc;
a level conversion module 402, configured to perform level conversion on the first binary bit stream according to a modulation mode, so as to obtain a third binary bit stream;
a deblurring module 403, configured to deblur the third binary bit stream to obtain a fourth binary bit stream;
a frame length estimation module 404, configured to perform frame length estimation on the fourth binary bit stream to obtain a frame length parameter;
and the identifying module 405 is configured to identify a channel coding mode of the L-band satellite communication signal according to the frame length parameter and the modulation mode.
It can be understood that the working contents of each module of the channel code identification device provided in the embodiment of the present application are the same as the contents of each step of the channel code identification method described in the embodiment of fig. 1, and are not described herein again.
The third aspect of the present application also provides an electronic device comprising a memory, a processor and a computer program stored on the memory that is executable by the processor. The steps of the channel code identification method provided in the first aspect are implemented when a processor executes a computer program.
A fourth aspect of the present application provides a storage medium, which may be a memory. The storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the channel code identification method provided in the first aspect. Further, the computer readable storage medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a RAM, a magnetic disk, or an optical disk, etc. which may store the program code.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of modules is merely a logical function division, and there may be additional divisions of actual implementation, e.g., multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not performed. The modules illustrated as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules.
The integrated modules, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a readable storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned readable storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.
It should be noted that, for the sake of simplicity of description, the foregoing method embodiments are all expressed as a series of combinations of actions, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily all necessary for the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
The foregoing describes the channel code identification method, apparatus, storage medium and terminal provided in the present application, and those skilled in the art, based on the ideas of the embodiments of the present application, may change the specific implementation and application scope, so that the content of the present application should not be construed as limiting the present application.
Claims (5)
1. A channel code identification method for identifying a channel code of an L-band satellite communication signal, the method comprising:
acquiring a first binary bit stream of an L-band satellite communication signal to be identified and a modulation mode of the L-band satellite communication signal, wherein the L-band satellite communication signal is obtained by performing channel coding, modulation, channel transmission and demodulation on a second binary bit stream of an original communication signal, and the coding mode of the channel coding comprises the following steps: VTB, TCM, TPC, LDPC and versafc;
performing level conversion on the first binary bit stream according to the modulation mode to obtain a third binary bit stream; wherein, the modulation mode is one of binary phase shift keying, quadrature phase shift keying, offset quadrature phase shift keying and 8 PSK;
performing deblurring processing on the third binary bit stream to obtain a fourth binary bit stream;
performing frame length estimation on the fourth binary bit stream to obtain frame length parameters;
calculating composite values corresponding to different coding rates according to the frame length parameters and the modulation modes;
when the composite value is larger than a preset threshold value, the channel coding mode is identified as a convolution coding mode; and when the composite value is smaller than a preset threshold value, determining the channel coding mode as a TPC coding mode or a TCM coding mode.
2. The method for identifying channel coding according to claim 1, wherein said performing frame length estimation on the fourth binary bit stream to obtain frame length parameters includes:
acquiring a frame header of the fourth binary bit stream;
determining a frame header type of the frame header;
determining frame length data of the binary bit stream according to the frame header type;
and determining the frame header and the frame length data as frame length parameters.
3. A channel code identification device for identifying a channel code of an L-band satellite communication signal, the device comprising:
the system comprises an acquisition module, a channel coding module and a demodulation module, wherein the acquisition module is used for acquiring a first binary bit stream of an L-band satellite communication signal to be identified and a modulation mode of the L-band satellite communication signal, the L-band satellite communication signal is obtained after channel coding, modulation, channel transmission and demodulation of a second binary bit stream of an original communication signal, and the coding mode of the channel coding comprises: VTB, TCM, TPC, LDPC and versafc;
the level conversion module is used for carrying out level conversion on the first binary bit stream according to the modulation mode to obtain a third binary bit stream; wherein, the modulation mode is one of binary phase shift keying, quadrature phase shift keying, offset quadrature phase shift keying and 8 PSK;
the deblurring module is used for carrying out deblurring processing on the third binary bit stream to obtain a fourth binary bit stream;
the frame length estimation module is used for carrying out frame length estimation on the fourth binary bit stream to obtain frame length parameters; the identification module is used for calculating composite values corresponding to different coding rates according to the frame length parameters and the modulation modes, and identifying the channel coding mode as a convolution coding mode when the composite values are larger than a preset threshold value; and when the composite value is smaller than a preset threshold value, determining the channel coding mode as a TPC coding mode or a TCM coding mode.
4. An electronic device comprising a memory, a processor and a computer program stored on the memory that is executable by the processor, characterized in that the processor, when executing the computer program, implements the steps of the method according to any one of claims 1 or 2.
5. A storage medium having stored thereon a computer program, which, when executed by a processor, implements the steps of the method of any of claims 1 or 2.
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