CN116232825B - Information modulation and information demodulation methods and devices - Google Patents

Information modulation and information demodulation methods and devices Download PDF

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Publication number
CN116232825B
CN116232825B CN202310477264.5A CN202310477264A CN116232825B CN 116232825 B CN116232825 B CN 116232825B CN 202310477264 A CN202310477264 A CN 202310477264A CN 116232825 B CN116232825 B CN 116232825B
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information
symbol
bit
content
symbols
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CN116232825A (en
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吕强
宋博
王捷
封世刚
刘金全
李阳
杨立业
田方
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Beijing Guodian Gaoke Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/106—M-ary FSK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0011—Complementary
    • H04J13/0014—Golay
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Error Detection And Correction (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

The invention provides an information modulation and information demodulation method and device, and relates to the technical field of communication, wherein the information modulation method comprises the following steps: dividing the target information into a plurality of information fragments by taking two bytes as an interval according to the sequence from beginning to end; interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments; carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining an MFSK signal corresponding to the information fragment; the symbol templates are constructed based on the coding mode of Gray codes. The information modulation and information demodulation methods and the information demodulation devices can improve the satellite dynamic Doppler effect resistance of the modulated MFSK signal, improve the accuracy of the modulated MFSK signal in satellite communication, and enable the code rate of the modulated MFSK signal to be higher.

Description

Information modulation and information demodulation methods and devices
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for modulating and demodulating information.
Background
The multilevel digital frequency modulation ((Multiple Frequency Shift Keying, MFSK) is a generalization of binary digital frequency modulation (Frequency Shift Keying,2 FSK), which is a modulation scheme that can represent multiple digital information with multiple different carrier frequencies.
As a multi-system frequency modulation mode, MFSK has a lower demodulation threshold than 2FSK, which is more beneficial to improving the communication rate and improving the utilization of the transmission bandwidth.
However, since MFSK uses multiple carriers, the frequency difference between carriers in MFSK is smaller than that between carriers in 2 FSK. In the satellite communication field, the MFSK with smaller frequency difference between carriers is more sensitive to the dynamic doppler effect of the satellite, and if the MFSK is adopted for information modulation in satellite data transmission, the dynamic doppler effect of the satellite can seriously influence the accuracy of the MFSK signal in the satellite transmission process.
Disclosure of Invention
The invention provides an information modulation and demodulation method and device, which are used for solving the defect that the dynamic Doppler effect of a satellite in the prior art seriously affects the accuracy of an MFSK signal in the satellite transmission process, and improving the accuracy of the MFSK signal in the satellite transmission process.
The invention provides an information modulation method, which comprises the following steps:
dividing the target information into a plurality of information fragments by taking two bytes as an interval according to the sequence from beginning to end;
interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments;
performing multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and acquiring an MFSK signal corresponding to the information fragment;
the symbol template is constructed based on the coding mode of Gray codes and is used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi;
the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in any two content symbols of different bit are different.
According to the information modulation method provided by the invention, the target information is divided into a plurality of information fragments by taking two bytes as intervals according to the sequence from beginning to end, and the method further comprises the following steps:
acquiring original information;
generating Cyclic Redundancy Check (CRC) information of the original information, and splicing the CRC information to the tail of the original information to obtain the target information.
According to the information modulation method provided by the invention, the information modulation method is used for satellite communication.
The invention provides an information demodulation method, which comprises the following steps:
acquiring a multi-system digital frequency Modulation (MFSK) signal corresponding to an information fragment, and checking the information fragment based on a predefined symbol template and the carrier frequency of the MFSK signal;
under the condition that the information fragment is determined to not pass the verification, determining an error symbol with error in each content symbol corresponding to the information fragment;
correcting the error symbol;
acquiring the information fragment based on each corrected content symbol;
the symbol template is constructed based on the coding mode of Gray codes and is used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi;
The change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in any two content symbols of different bits is different;
the MFSK signal corresponding to the information fragment is modulated based on the following steps:
dividing target information into a plurality of information fragments by taking two bytes as an interval according to the sequence from beginning to end;
interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments;
and carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining the MFSK signal corresponding to the information fragment.
According to the information demodulation method provided by the invention, the verification of the information fragment based on the predefined symbol template and the carrier frequency of the MFSK signal comprises the following steps:
Based on the symbol template and the carrier frequency of the MFSK signal, acquiring a Gray code word corresponding to each bit in each bit of the content symbol corresponding to the information fragment and a Gray code word corresponding to each bit in the check symbol corresponding to the information fragment;
based on each Gray code word, acquiring a content symbol and a check symbol of each bit corresponding to the information fragment;
carrying out Hamming code encoding on each content symbol to obtain a verification symbol corresponding to the information fragment;
and determining whether the information fragment passes verification based on whether the verification symbol and the verification symbol are consistent.
According to the information demodulation method provided by the invention, when the information fragment is determined to not pass the verification, the error symbol with error is determined to occur in each content symbol corresponding to the information fragment, and the method comprises the following steps:
determining suspected bit times of bits with possible errors based on the verification symbol and the bit times of inconsistent values in the verification symbol;
if the code distance between the adjacent carrier frequency of the carrier frequency corresponding to the content symbol of any bit corresponding to the information fragment and the gray code word corresponding to the bit of the suspected bit in the content symbol of any bit found in the symbol template based on the suspected bit is 1, determining that the content symbol of any bit corresponding to the information fragment is a suspected content symbol;
And determining the error symbol based on the suspected content symbol.
According to the information demodulation method provided by the invention, the determining the error symbol based on the suspected content symbol comprises the following steps:
determining the suspected content symbols as error symbols when the number of the suspected content symbols is 1, performing traversal calculation through a CRC algorithm when the number of the suspected content symbols is a plurality of the suspected content symbols, and determining the error symbols in the suspected content symbols;
wherein the target information is obtained by:
acquiring original information;
generating Cyclic Redundancy Check (CRC) information of the original information, and splicing the CRC information to the tail of the original information to obtain the target information.
According to the information demodulation method provided by the invention, after the information fragment is verified based on the predefined symbol template and the carrier frequency of the MFSK signal, the method further comprises:
and acquiring the information fragment based on each content symbol under the condition that the information fragment passes the verification.
According to the information demodulation method provided by the invention, the error symbol is corrected, and the method comprises the following steps:
And modifying the carrier frequency corresponding to the error symbol into the adjacent carrier frequency, wherein the code distance of the Gray code word corresponding to the bit of the suspected bit in the error symbol is increased by 1 or reduced by 1.
According to the information demodulation method provided by the invention, the information demodulation method is used for satellite communication.
The invention also provides an information modulation device, comprising:
the information segmentation module is used for dividing the target information into a plurality of information fragments according to the sequence from beginning to end with two bytes as intervals;
the Hamming code encoding module is used for carrying out interleaving treatment on the information fragments, carrying out Hamming code encoding on each content symbol after obtaining the content symbol of each bit corresponding to the information fragments, and generating check symbols corresponding to the information fragments;
the MFSK modulation module is used for carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining an MFSK signal corresponding to the information fragment;
the symbol template is constructed based on the coding mode of Gray codes and is used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi;
The change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in any two content symbols of different bit are different.
The invention also provides an information demodulation device, which comprises:
the information fragment verification module is used for acquiring a multi-system digital frequency Modulation (MFSK) signal corresponding to an information fragment, and verifying the information fragment based on a predefined symbol template and the carrier frequency of the MFSK signal;
the error symbol determining module is used for determining error symbols with errors in the content symbols corresponding to the information fragments under the condition that the information fragments are determined to not pass the verification;
the error symbol correction module is used for correcting the error symbol;
the information demodulation module is used for acquiring the information fragments based on each corrected content symbol;
the symbol template is constructed based on the coding mode of Gray codes and is used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi;
The change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in any two content symbols of different bits is different;
the MFSK signal corresponding to the information fragment is modulated based on the following steps:
dividing target information into a plurality of information fragments by taking two bytes as an interval according to the sequence from beginning to end;
interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments;
and carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining the MFSK signal corresponding to the information fragment.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing any one of the information modulation method and/or the information demodulation method as described above when executing the program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements an information modulation method and/or the information demodulation method as described in any one of the above.
The invention also provides a computer program product comprising a computer program which, when executed by a processor, implements the information modulation method and/or the information demodulation method as described in any one of the above.
After each content symbol and check symbol corresponding to each information fragment are generated through interleaving processing and Hamming code encoding, the MFSK modulation is carried out on each content symbol and check symbol based on a predefined symbol template, the MFSK signal corresponding to each information fragment is obtained, the symbol template is constructed based on a Gray code encoding method and is used for describing the mapping relation between different bit times of content symbols, different bit times of symbols with different bit times and different frequency carriers and different lattice Lei Mazi, the change frequency of each codeword corresponding to the carrier wave of each bit frequency of a target bit time in the content symbol with any bit time in the symbol template is larger than the change frequency of each Gray code corresponding to the carrier wave of each frequency of a non-target bit time in the content symbol, the target bit time in any two different bit time in the symbol template is different, the capacity of resisting satellite dynamic Doppler effect of the MFSK signal obtained through modulation in satellite communication can be improved, the capacity of the MFSK signal obtained through modulation in satellite communication can be reduced, the communication efficiency of the MFSK signal can be improved, and the communication satellite communication efficiency of the MFSK signal can be improved, and the satellite communication accuracy can be improved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of an information modulation method provided by the invention;
fig. 2 is a schematic structural diagram of target information in the information modulation method provided by the present invention;
FIG. 3 is a schematic diagram of a first information segment of target information in the information modulation method according to the present invention;
FIG. 4 is a schematic diagram of Hamming code encoding for each content symbol corresponding to a first information segment in the information modulation method provided by the present invention;
fig. 5 is a flow chart of an information demodulation method provided by the invention. The information demodulation method of the present invention is described below with reference to fig. 5;
fig. 6 is a schematic structural diagram of an information modulation apparatus provided by the present invention;
fig. 7 is a schematic diagram of the structure of an information demodulating apparatus provided by the present invention;
fig. 8 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The satellite measurement and control refers to the coincidence between various performance indexes and the overall design after the satellite is in orbit. The performance indexes may include accuracy of information transmission.
The 2FSK has better anti-noise performance and anti-attenuation performance, and is widely applied to measurement and control of low-orbit satellite ultrahigh frequency (Ultra High Frequency, UHF) frequency band and medium-low speed data transmission.
When the medium-low speed data transmission is measured and controlled on the low-orbit satellite, the ground transmitting end carries out 2FSK modulation on the measured and controlled information, and after a 2FSK signal is obtained, the 2FSK signal can be transmitted to the low-orbit satellite; the low-orbit satellite can send the 2FSK signal to a ground receiving end under the condition of receiving the 2FSK signal; the ground receiving end can demodulate the 2FSK signal under the condition of receiving the 2FSK signal to obtain demodulation information, and the accuracy of low-speed data transmission in the low-orbit satellite is obtained by judging the demodulation information and the measurement and control information to be used as a measurement and control result of low-speed data transmission measurement and control in the low-orbit satellite.
The MFSK is a popularization of 2FSK, and the MFSK includes M different carrier frequencies for selection, where each carrier frequency band may correspond to symbol information of M system, that is, different carriers with different frequencies may be used to represent different digital information, and only one carrier with one frequency is sent in a certain symbol time.
Since MFSK is a multi-system frequency modulation, MFSK has a lower demodulation threshold than 2FSK, which is more advantageous for improving the communication rate and improving the utilization of the transmission bandwidth. Under the condition that the MFSK is used for medium-low speed data transmission measurement and control of a low-orbit satellite, the communication rate of measurement and control and the transmission bandwidth of measurement and control are improved.
However, since MFSK uses multiple carriers, the frequency difference between carriers in MFSK is smaller than that between carriers in 2FSK, and thus MFSK with smaller frequency difference between carriers is more sensitive to dynamic doppler effect of satellites.
If MFSK is used for information modulation in satellite communication, the dynamic doppler effect of the satellite can seriously affect the accuracy of MFSK signals in satellite communication.
Specifically, after the ground transmitting end adopts MFSK to modulate to obtain the carrier wave with the first frequency, the dynamic doppler effect of the satellite may cause the frequency drift of the carrier wave with the first frequency in the satellite communication process, the first frequency drift is changed into the second frequency, and the ground receiving end demodulates the carrier wave with the second frequency, so that the obtained information will be wrong. In addition, if MFSK is adopted for information modulation in low-speed data transmission measurement and control in the low-orbit satellite, the accuracy of the low-speed data transmission measurement and control result in the low-orbit satellite is also affected.
In this regard, the present invention provides an information modulation method and an information demodulation method. The MFSK signal obtained by carrying out information modulation based on the information modulation method provided by the invention has better capability of resisting the satellite dynamic Doppler effect in satellite communication, can reduce the influence of the satellite dynamic Doppler effect on the MFSK signal in the satellite transmission process, can improve the accuracy of the MFSK signal in the satellite transmission process, has high code rate of the MFSK signal, and can improve the satellite communication efficiency and the utilization rate of the satellite transmission bandwidth.
Fig. 1 is a schematic flow chart of an information modulation method provided by the invention. The information modulation method of the present invention is described below with reference to fig. 1. As shown in fig. 1, the method includes: step 101, dividing target information into a plurality of information fragments with two bytes as intervals according to the sequence from beginning to end;
it should be noted that, in the embodiment of the present invention, the execution body may be an information modulation apparatus.
It should be noted that the information modulation method provided by the invention is used for satellite communication.
Accordingly, the information modulation device may be a ground transmitting end, or the information modulation device may transmit the MFSK signal obtained by modulation to the ground transmitting end, so that the ground transmitting end transmits the received MFSK signal to the satellite end.
It should be noted that, the original information is a modulation object of the information modulation method provided by the present invention. Based on the information modulation method provided by the invention, the original information can be modulated into the MFSK signal.
It should be noted that, in the embodiment of the present invention, the target information is obtained based on the original information. For example, after the original information is obtained, verification information corresponding to the original information may be generated, and the verification information may be spliced to the tail of the original information to obtain the target information.
As an alternative embodiment, before dividing the target information into a plurality of information pieces in order from beginning to end at intervals of two bytes, the method further comprises: and acquiring the original information.
Specifically, in the embodiment of the present invention, the original information may be obtained in a plurality of ways. For example, the above-described original information may be acquired based on an input of a user; alternatively, the above original information sent by other electronic devices may be received. The specific manner of acquiring the original information in the embodiment of the present invention is not particularly limited.
It should be noted that, in the embodiment of the present invention, p may be used to identify the byte order in the original information; wherein, P is equal to or greater than 1 and equal to or less than P, and P represents the total number of bytes in the original information.
Correspondingly, the byte p represents the p-th byte in the original information; the original information may include byte 1, byte 2, …, byte P, …, byte P-1, and byte P, which are arranged in order from beginning to end.
Generating Cyclic Redundancy Check (CRC) information of the original information, and splicing the CRC information to the tail of the original information to obtain target information.
Specifically, after the original information is obtained, CRC check information corresponding to the original information may be generated based on a cyclic redundancy check (Cyclic Redundancy Check, CRC) algorithm, and the CRC check information may be spliced to the tail of the original information to obtain the target information.
The CRC algorithm is a fast algorithm for generating short fixed bit check codes according to data such as network data packets or computer files and the like, and is mainly used for detecting or checking errors possibly occurring after data transmission or storage. CRC uses the principle of division and remainder to realize the function of error detection, and has the advantages of clear principle, simple realization and the like.
It should be noted that, in the embodiment of the present invention, the CRC check information corresponding to the original information generated based on the CRC algorithm includes 2 bytes, which are respectively a check byte 1 and a check byte 2 arranged in sequence from beginning to end.
It should be noted that, in the case that the number of bytes of the original information is odd, a null byte may be appended to the tail of the original information, so that after the number of bytes of the original information is even, the CRC check information is added to the tail of the original byte.
Fig. 2 is a schematic structural diagram of target information in the information modulation method provided by the present invention. As shown in fig. 2, the target information may include byte 1, byte 2, …, byte P, …, byte P-1, byte P, check byte 1, and check byte 2, which are arranged in order from beginning to end.
After the target information is acquired, the target information may be divided into a plurality of information pieces in order from beginning to end with two bytes as an interval. For example, the first information piece in the above-mentioned target information includes byte 1 and byte 2 arranged in sequence, the second information piece includes byte 3 and byte 4 arranged in sequence, the third information piece includes byte 5 and byte 6 arranged in sequence, and so on.
It will be appreciated that any piece of information comprises 16 bits arranged in a head-to-tail order.
It should be noted that in the embodiment of the present invention, the bit number of the bit may be identified by i, and the bit number of different bit numbers may be represented by bi; wherein i is more than or equal to 1 and less than or equal to 16. For example, bi in any piece of information may represent the i-th bit in the piece of information.
Since the step of modulating any one of the pieces of information in the target information based on the information modulation method provided by the present invention is the same as the step of modulating the first piece of information in the target information, the information modulation method provided by the present invention will be described below taking the modulation of the first piece of information in the target information as an example.
Fig. 3 is a schematic structural diagram of a first information segment of target information in the information modulation method provided by the present invention. As shown in fig. 3, the first piece of information includes byte 1 and byte 2 arranged in sequence, including b1, b2, b3, …, b15, and b16 arranged in the order from beginning to end; wherein byte 1 includes b1 through b8 arranged in a head-to-tail order and byte 2 includes b9 through b15 arranged in a head-to-tail order.
Step 102, interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments.
It should be noted that, each information segment in the target information is interleaved to obtain each content symbol corresponding to each information segment, so that each information segment is whitened, thereby being more beneficial to information transmission.
Specifically, the first information segment is subjected to interleaving processing, so that four content symbols corresponding to the first information segment can be obtained.
In the embodiment of the invention, j can be used for identifying the bit of the content symbol; wherein j is more than or equal to 1 and less than or equal to 4. The content symbol 1 corresponding to the first information segment may represent a first content symbol corresponding to the first information segment, the content symbol 2 corresponding to the first information segment may represent a second content symbol corresponding to the first information segment, and so on.
It will be appreciated that in the embodiment of the present invention, the order of the content symbols in the first information segment is determined based on the order in which the bits of the first information segment are interleaved.
Fig. 3 is a schematic diagram of an interleaving process for a first information segment in the information modulation method according to the present invention. As shown in fig. 3, the content symbol 1, the content symbol 2, the content symbol 3, and the content symbol 4 corresponding to the first information fragment each include four bits, b1, b2, b3, and b4, which are sequentially arranged from beginning to end.
It will be appreciated that b1 in content symbol 1 may represent the first bit in content symbol 1; b2 in content symbol 1 may represent the second bit in content symbol 1.
B1 in the content symbol 1 is b1 in the first information segment; b2 in the content symbol 1 is b5 in the first information fragment; b3 in the content symbol 1 is b9 in the first information fragment; b4 in the content symbol 1 is b13 in the first information fragment.
Similarly, b1 in the content symbol 2 is b2 in the first information segment; b2 in the content symbol 2 is b6 in the first information fragment; b3 in the content symbol 2 is b10 in the first information fragment; b4 in the content symbol 2 is b14 in the first information fragment.
By analogy, b1, b2, b3, and b4 in the content symbol 3, and b1, b2, b3, and b4 in the content symbol 4 can be obtained by the interleaving process.
Step 103, carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining an MFSK signal corresponding to the information fragment;
the symbol templates are constructed based on the coding mode of Gray codes and are used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols with different bit numbers and carriers with different frequencies, mapping relations between bits with different bit numbers in check symbols and carriers with different frequencies, and mapping relations between check symbols and carriers with different bit numbers Lei Mazi;
The change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in the content symbols of any two different bits is different.
Specifically, after each content symbol corresponding to the first information segment is obtained, the check symbol corresponding to the first information segment may be generated by performing hamming code encoding on the content symbol 1, the content symbol 2, the content symbol 3, and the content symbol 4 corresponding to the first information segment.
Fig. 4 is a schematic diagram of hamming code encoding for each content symbol corresponding to the first information segment in the information modulation method provided by the present invention. As shown in fig. 4, the check symbol corresponding to the first information fragment includes four bits, b1, b2, b3 and b4, which are sequentially arranged from beginning to end.
It can be understood that b1 in the check symbol corresponding to the first information segment may represent the first bit in the check symbol corresponding to the first information segment; b2 in the check symbol corresponding to the first information segment may represent a second bit in the check symbol corresponding to the first information segment; b3 in the check symbol corresponding to the first information segment may represent a third bit in the check symbol corresponding to the first information segment; b4 in the check symbol corresponding to the first information segment may represent the fourth bit in the check symbol corresponding to the first information segment.
B1 in the check symbol corresponding to the first information fragment is obtained by performing exclusive or on b1 in the content symbol 1, b1 in the content symbol 2, b1 in the content symbol 3 and b1 in the content symbol 4 corresponding to the first information fragment;
similarly, b2 in the check symbol corresponding to the first information fragment is obtained by performing exclusive or on b2 in the content symbol 1, b2 in the content symbol 2, b2 in the content symbol 3 and b2 in the content symbol 4 corresponding to the first information fragment;
and so on, b3 and b4 in the check symbol corresponding to the first information fragment can be obtained by bitwise exclusive or.
It should be noted that, in the embodiment of the present invention, q may be used to identify a carrier existing in MFSK, and fq may be used to identify a frequency of a q-th carrier in MFSK; wherein, Q is more than or equal to 1 and less than or equal to Q, and Q represents the total number of carriers existing in the MFSK modulation; for example, f1 represents the frequency of the first carrier in MFSK modulation, and f2 represents the frequency of the second carrier.
It should be noted that, in the embodiment of the present invention, the frequency of each carrier wave in the MFSK satisfies f1 < f2 < f3 < … < FQ-1 < FQ.
In the embodiment of the present invention, an example is taken that 16 carriers with different frequencies (i.e. q=16) exist when MFSK modulation is performed, which illustrates the information modulation method provided by the present invention. Accordingly, the frequency of each carrier wave in the MFSK satisfies f1 < f2 < f3 < … < FQ-1 < f16.
After the content symbols and check symbols corresponding to the first information segment are obtained, a gray codeword corresponding to each bit in each bit of the content symbols corresponding to the first information segment and a gray codeword corresponding to each bit in the check symbols corresponding to the first information segment may be determined based on a predefined symbol template.
After determining the gray code word corresponding to each bit in the content symbol of each bit corresponding to the first information segment in the target information and the gray code word corresponding to each bit in the check symbol of each bit in the first information segment, the MFSK modulation may be performed on the content symbol of each bit and the check symbol of each bit in the check symbol of the first information segment based on the gray code word corresponding to each bit in the content symbol of each bit in the first information segment, the gray code word corresponding to each bit in the check symbol of the first information segment, and the symbol target, so as to determine the carrier frequency corresponding to the content symbol of each bit and the carrier frequency corresponding to the check symbol, and further generate the MFSK signal corresponding to the first information segment.
It will be appreciated that the MFSK signal corresponding to the first piece of information is a superposition of a series of carriers of different frequencies.
It can be appreciated that the code rate of the MFSK signal corresponding to the first information segment is 80%, which is far higher than the normal level.
It should be noted that, since only one bit of the adjacent code words of the gray codes is different, and only one bit of the code words of the gray codes is different between the maximum number and the minimum number, the coding mode of the gray codes can reduce errors occurring in the information modulation process, so in the embodiment of the invention, according to the coding mode based on the gray codes, symbol templates for describing mapping relations between content symbols of different bit numbers, bits of different bit numbers in the content symbols of different bit numbers and carriers of different frequencies and different lattices Lei Mazi are constructed.
It should be noted that, since the check symbol corresponding to the first information segment is obtained by means of hamming code based on each content symbol corresponding to the first information segment, in the process of demodulating the MFSK signal corresponding to the first information segment based on the information demodulation method provided by the present invention, it may be checked whether the carrier frequency drift occurs in the process of satellite communication in the MFSK signal corresponding to the first information segment based on the check function of hamming code.
It will be appreciated that if it is determined that the MFSK signal corresponding to the first information segment has carrier frequency drift based on the hamming code checking function, the bit order of the erroneous bits may be further determined based on the hamming code checking function.
Since each content symbol corresponding to the first information segment includes b1, b2, b3, and b4 arranged in sequence, after determining the bit level of the error, it is not possible to directly determine the content symbol in which the error occurs in each content symbol corresponding to the first information segment.
In order to determine the content symbol with error in each content symbol corresponding to the first information fragment based on the bit number of the bit with error, in the embodiment of the present invention, when the symbol template is constructed, the target bit number corresponding to the content symbol with each bit number may be determined according to priori knowledge and/or actual conditions, and it is ensured that the target bit numbers corresponding to any two content symbols with different bit numbers are different.
Optionally, in the embodiment of the present invention, the target rank corresponding to the content symbol 1 may be determined as 1, the target rank corresponding to the content symbol 2 may be determined as 4, the target rank corresponding to the content symbol 3 may be determined as 3, and the target rank corresponding to the content symbol 4 may be determined as 2;
Accordingly, the bit of the target rank in the content symbol 1 is b1, the bit of the target rank in the content symbol 2 is b4, the bit of the target rank in the content symbol 3 is b3, and the bit of the target rank in the content symbol 4 is b2.
After determining the target bit number corresponding to the content symbol of each bit number, a symbol template satisfying the change frequency of each gray codeword corresponding to the carrier wave of each frequency of the bit number of the target bit in the content symbol of any bit number and being larger than the change frequency of each gray codeword corresponding to the carrier wave of each frequency of the bit number of the non-target bit number in the content symbol of the bit number can be constructed based on the coding mode of the gray code.
The target bit number corresponding to the check symbol may be any bit number.
Optionally, in the embodiment of the present invention, the target bit number corresponding to the check symbol is 1, that is, the bit number of the target bit number in the check symbol is b1.
Table 1 is one of the schematic tables of the symbol templates described above, and is used to describe the mapping relationship between the content symbol 1, the bits of each bit and the carrier of each frequency in the content symbol 1, and the gray code word.
TABLE 1 one of the schematic tables of symbol templates
Figure SMS_1
Table 2 is a second schematic table of the symbol templates, and is used for describing the mapping relationship between the content symbol 2, the bits of each bit and the carrier of each frequency in the content symbol 2, and the gray code word.
TABLE 2 schematic form of symbol templates
Figure SMS_2
Table 3 is a third schematic table of the symbol templates for describing the mapping relationship between the content symbol 3, the bits of each bit and the carrier of each frequency in the content symbol 3, and the gray code word.
TABLE 3 third schematic form of symbol templates
Figure SMS_3
Table 4 is a fourth schematic table of the symbol templates described above, and is used to describe the mapping relationship between the content symbol 4, the bits of each bit and the carrier of each frequency in the content symbol 4, and the gray code word.
TABLE 4 schematic form of symbol templates
Figure SMS_4
Table 5 is a fifth schematic table of the symbol templates, and is used for describing the mapping relationship between the check symbol, the bit of each bit in the check symbol and the carrier wave of each frequency, and the gray code word.
TABLE 5 schematic form of symbol templates
Figure SMS_5
If the frequency of a certain carrier shifts due to the dynamic doppler effect of the satellite, the frequency of the carrier will typically shift from the original frequency to a frequency adjacent to the original frequency. For example, if the dynamic doppler effect of a satellite causes a shift in the frequency of a carrier with an original frequency f1, the frequency of the carrier will typically shift from f1 to f2 only.
Therefore, after determining the bit order of the bit having the error, the gray code word corresponding to the bit of the bit order and the gray code word corresponding to the adjacent carrier frequency of the bit order and the carrier frequency can be searched in the symbol template based on the carrier frequency corresponding to each content symbol corresponding to the first information fragment, and the content symbol having the code distance of 1 between the gray code words corresponding to the adjacent carrier frequency of the bit order and the carrier frequency can be used as the content symbol having the error possibly.
For example, when it is determined that the bit order of the bit having the error is 1, and the carrier frequency corresponding to the content symbol 1 corresponding to the first information segment is f2, it may be found in table 1 that the gray code word corresponding to the b1 bit carrier frequency f2 in the content symbol 1 is 1 and the gray code word corresponding to the b1 bit carrier frequency f1 in the content symbol 1 is 0, it may be determined that the content symbol 1 corresponding to the first information segment may have the error, and the carrier frequency corresponding to the content symbol 1 corresponding to the first information segment may be shifted from f1 to f2.
However, if the frequency of the gray code words corresponding to the carriers of the frequencies of the bits in each of the content symbols in each of the symbol templates is the same, the number of the obtained content symbols which may have errors is generally plural and the content symbols which have errors cannot be actually determined based on the table look-up method.
Therefore, the change frequency of each gray codeword corresponding to the carrier of each frequency b1 in the content symbol 1 in the symbol template in the embodiment of the present invention is greater than the change frequency of each gray codeword corresponding to the carrier of each frequency b2, b3 and b4 in the content symbol 1; the change frequency of each Gray code word corresponding to the carrier wave of each frequency b4 in the content symbol 2 is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency b1, b2 and b3 in the content symbol 2; the change frequency of each Gray code word corresponding to the carrier wave of each frequency b3 in the content symbol 3 is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency b1, b2 and b4 in the content symbol 3; the change frequency of each gray code word corresponding to the carrier wave of each frequency b2 in the content symbol 4 is larger than the change frequency of each gray code word corresponding to the carrier wave of each frequency b1, b3 and b4 in the content symbol 4, so that the number of the content symbols which are determined based on the table look-up mode and possibly have errors can be obviously reduced.
It should be noted that, if the number of content symbols that may have errors and are determined based on the symbol templates in the embodiment of the present invention is a plurality of content symbols, the traversal calculation may be performed based on the CRC algorithm, and the content symbol that may have an error may be determined from among the content symbols that may have errors.
It should be noted that, after the MFSK signal corresponding to each information segment is obtained based on the information modulation method provided by the present invention, the ground transmitting terminal may transmit the MFSK signal corresponding to each information segment to the satellite terminal. Under the condition that the satellite end receives the MFSK signals corresponding to each information fragment, the MFSK signals corresponding to each information fragment can be sequentially sent to the ground receiving end in sequence from beginning to end.
After receiving the MFSK signal corresponding to any information segment in the target information, the ground receiving end may demodulate the MFSK signal corresponding to the information segment based on the information demodulation method provided by the present invention, so as to obtain the information segment.
After each content symbol and check symbol corresponding to each information fragment are generated through interleaving processing and hamming code encoding, the MFSK signal corresponding to each information fragment is obtained by carrying out MFSK modulation on each content symbol and check symbol based on a predefined symbol template, the symbol template is constructed based on a Gray code encoding method and is used for describing the capacity of the MFSK signal obtained by modulation for resisting satellite dynamic Doppler effect in satellite communication, and the mapping relation between different bits and different frames Lei Mazi, wherein the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in any one of the symbol templates is larger than the change frequency of each Gray code corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol, and the target bit in any two different bit in the symbol template is different, so that the capacity of the MFSK signal obtained by modulation for resisting satellite dynamic Doppler effect in satellite communication can be improved, the influence of the MFSK signal on the MFSK signal obtained by modulation on the satellite communication dynamic Doppler effect in satellite communication can be reduced, the accuracy of the MFSK signal can be improved, the communication rate can be improved, and the communication bandwidth can be increased.
According to the embodiment of the invention, the target information is obtained by generating the CRC information of the original information and splicing the CRC information to the tail part of the original information, so that the situation that the wrong content symbols are difficult to determine when the number of the obtained content symbols which are likely to be wrong is determined to be a plurality of content symbols can be avoided.
Fig. 5 is a flow chart of an information demodulation method provided by the invention. The information demodulation method of the present invention is described below with reference to fig. 5. As shown in fig. 5, the method includes: step 501, acquiring an MFSK signal corresponding to an information fragment, and verifying the information fragment based on a predefined symbol template and a carrier frequency of the MFSK signal;
the MFSK signals corresponding to the information fragments are modulated based on the information modulation method;
the symbol template is constructed based on the coding mode of Gray codes and is used for describing the content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols and carriers with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols and carriers with different bit numbers and different frequencies, and mapping relations between the check symbols and carriers with different cells Lei Mazi;
the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in the content symbols of any two different bits is different;
The MFSK signal corresponding to the information fragment is modulated based on the following steps:
dividing the target information into a plurality of information fragments by taking two bytes as an interval according to the sequence from beginning to end;
interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments;
and carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining an MFSK signal corresponding to the information fragment.
It should be noted that, the execution body of the embodiment of the present invention is an information demodulation device.
It should be noted that the information demodulation method provided by the invention is used for satellite communication.
Accordingly, the information demodulation device may be a ground receiving end, or the ground receiving end may send the MFSK signal to be demodulated to the information demodulation device after receiving the MFSK signal to be demodulated, so that the information demodulation device demodulates the MFSK signal to be demodulated.
It should be noted that, the information segment in the embodiment of the present invention may be any one of the information segments in the above-mentioned target information.
The MFSK signal corresponding to the information fragment is a demodulation object of the information demodulation method provided by the invention. The MFSK signal corresponding to the information fragment is modulated based on the information modulation method provided by the invention. The specific process of modulating the MFSK signal corresponding to the information fragment based on the information modulation method provided by the present invention may refer to the content of each embodiment, which is not described in detail in the embodiments of the present invention.
The step of demodulating the MFSK signal corresponding to the information segment in the target information according to the information demodulation method provided by the present invention is the same as the step of demodulating the MFSK signal corresponding to the first information segment in the target information, so that the information demodulation method provided by the present invention will be described below by taking demodulation of the MFSK signal corresponding to the first information segment in the target information as an example.
It is understood that the MFSK signal corresponding to the first information segment is a superposition of five carriers with different frequencies, and the carrier frequency based on the MFSK signal may include a carrier frequency corresponding to each content symbol of each bit corresponding to the first information segment and a carrier frequency corresponding to a check symbol corresponding to the first information segment.
Specifically, when the MFSK signal corresponding to the first information segment transmitted by the satellite terminal or transmitted by the terrestrial receiving terminal is received, the first information segment may be verified based on the symbol template, the carrier frequency corresponding to the content symbol of each bit, and the carrier frequency corresponding to the verification symbol corresponding to the first information segment.
Under the condition that the first information fragment passes the verification, it can be explained that the carrier frequency drift of the MFSK signal corresponding to the first information fragment does not occur in the satellite communication process, and the first information fragment can be obtained by demodulating the MFSK signal;
in the case that the first information segment fails to pass the verification, it may be stated that the first information segment corresponds to a carrier frequency shift of the MFSK signal during satellite communication, and information obtained by demodulating the MFSK signal is not the first information segment.
Based on the symbol template, the carrier frequency corresponding to the content symbol of each bit, and the carrier frequency corresponding to the check symbol of the first information segment, a gray codeword corresponding to the bit of each bit in the content symbol of each bit corresponding to the first information segment and a gray codeword corresponding to the bit of each bit in the check symbol of the first information segment may be obtained.
After the gray code word corresponding to each bit in each bit of the content symbol corresponding to the first information segment and the gray code word corresponding to each bit in each bit of the check symbol corresponding to the first information segment are obtained, MFSK demodulation may be performed based on the gray code word corresponding to each bit in each bit of the content symbol corresponding to the first information segment and the gray code word corresponding to each bit in each bit of the check symbol corresponding to the first information segment, so as to obtain each content symbol and check symbol corresponding to the first information segment, and further, the check function of hamming code may be used to check the first information segment.
Based on the content of the above embodiments, verifying the information segment based on the predefined symbol template and the carrier frequency of the MFSK signal includes: and acquiring Gray code words corresponding to the bits of each bit in the content symbols of each bit corresponding to the information fragment and Gray code words corresponding to the bits of each bit in the check symbols corresponding to the information fragment based on the symbol templates and carrier frequencies of the MFSK signals.
And acquiring the content symbol and the check symbol of each bit corresponding to the information fragment based on each Gray code word.
Specifically, after the gray code word corresponding to each bit in each bit of the content symbol corresponding to the first information segment and the gray code word corresponding to each bit in each bit of the check symbol corresponding to the first information segment are obtained based on the symbol template, the carrier frequency corresponding to each bit of the content symbol and the carrier frequency corresponding to each bit of the check symbol corresponding to the first information segment, the gray code word corresponding to each bit in each bit of the content symbol corresponding to the first information segment and the gray code word corresponding to each bit in each bit of the check symbol corresponding to the first information segment may be obtained.
And carrying out Hamming code encoding on each content symbol to obtain a verification symbol corresponding to the information fragment.
Specifically, the hamming code is performed on the content symbol of each bit corresponding to the first information segment, so as to generate a verification symbol corresponding to the first information segment.
It should be noted that, in the embodiment of the present invention, the method for performing hamming code encoding on the content symbol of each bit corresponding to the first information segment may refer to the content of each embodiment, which is not repeated in the embodiment of the present invention.
Based on whether the verification symbol and the check symbol are identical, it is determined whether the piece of information passes the check.
Specifically, after the verification symbol corresponding to the first information segment is obtained, whether the verification symbol corresponding to the first information segment is consistent with the verification symbol can be compared.
In the case that the verification symbol and the check symbol are inconsistent, it may be determined that the first information piece fails verification;
in case the verification symbol and the check symbol coincide, it may be determined that the first piece of information passes the check.
Step 502, determining an error symbol with an error in each content symbol corresponding to the information fragment when it is determined that the information fragment fails to pass the verification.
Specifically, when it is determined that the first information piece does not pass the verification, an error symbol in which an error occurs may be determined in each content symbol corresponding to the first information piece based on a gray codeword corresponding to a bit of each bit in each content symbol corresponding to the first information piece and a gray codeword corresponding to a bit of each bit in each verification symbol corresponding to the first information piece.
Based on the content of each embodiment, when it is determined that the information segment fails to pass the verification, determining an error symbol in which an error occurs in each content symbol corresponding to the information segment includes: based on the verification symbol and the number of bits in the verification symbol where inconsistent values occur, a suspected number of bits where errors may occur is determined.
Specifically, in the case where the verification symbol and the check symbol corresponding to the first information fragment are inconsistent, the suspected bit number of the bit in which the error may occur may be determined based on the bit number of the inconsistent value in the verification symbol and the check symbol.
For example, if the check symbol includes "1110" and the check symbol includes "1111", it may be determined that the suspected bit number of the bit in which the error may occur is 1.
If the code distance between the gray code word corresponding to the carrier frequency and the bit of the suspected bit corresponding to the content symbol of any bit corresponding to the information fragment and the gray code word corresponding to the adjacent carrier frequency and the bit of the suspected bit of the carrier frequency corresponding to the content symbol of any bit corresponding to the information fragment is 1 in the content symbol of any bit in the symbol template based on the suspected bit, determining that the content symbol of any bit corresponding to the information fragment is the suspected content symbol.
Specifically, after determining the suspected bit number of the bit in which an error may occur, for each content symbol in each bit number, it may be searched in the symbol template whether the code distance between the carrier frequency corresponding to the content symbol corresponding to the first information segment and the gray code word corresponding to the bit in the suspected bit number, and the adjacent carrier frequency of the carrier frequency corresponding to the content symbol corresponding to the first information segment and the gray code word corresponding to the bit in the suspected bit number are 1.
For example, if it is determined that the suspected bit number of the bit in which the error may occur is 1 and the carrier frequency corresponding to the content symbol 1 corresponding to the first information segment is f1, the gray code words corresponding to the content symbols 1, b1, and f1 may be found to be 0 in the symbol template, and the gray code words corresponding to the content symbols 1, b1, and f2 may be found to be 1 in the symbol template, and since the code distance between the gray code words corresponding to the content symbols 1, b1, and f1 and the gray code words corresponding to the content symbols 1, b1, and f2 is 1, it may be determined that the content symbol 1 corresponding to the first information segment is the suspected content symbol in which the error may occur.
It should be noted that the number of suspected content symbols in each content symbol corresponding to the information fragment may be one or more.
It should be noted that, based on the suspected bit number of the bit where the error may occur, by querying the symbol template, it may be possible to find out, in the check symbol, whether the code distance between the adjacent carrier frequency of the carrier frequency corresponding to the suspected bit number corresponding to the first information segment and the gray code word corresponding to the bit of the suspected bit number is 1.
For example, if it is determined that the suspected bit number of the bit in which the error may occur is 1 and the carrier frequency corresponding to the check symbol corresponding to the first information fragment is f8, the gray code words corresponding to the check symbols, b1 and f8 may be found to be 0 in the symbol template, and the gray code words corresponding to the check symbols, b1 and f7 may be found to be 1 in the symbol template, and since the code distance between the gray code words corresponding to the check symbols, b1 and f8 and the gray code words corresponding to the check symbols, b1 and f7 is 1, it may be determined that the check symbol corresponding to the first information fragment is the suspected content symbol in which the error may occur.
When it is determined that the check symbol corresponding to the first information segment is a suspected content symbol in which an error may occur and the number of the suspected content symbols is 1, it may be stated that each content symbol corresponding to the first information segment is not in error, and the first information segment may be obtained directly based on each content symbol corresponding to the first information segment.
Based on the suspected content symbols, error symbols are determined.
Specifically, after determining a plurality of content symbols of each level corresponding to the first information segment as suspected content symbols, an error symbol may be determined from the plurality of suspected content symbols.
Based on the content of the above embodiments, determining an error symbol based on the suspected content symbol includes: when the number of the suspected content symbols is 1, the suspected content symbols are determined to be error symbols, and when the number of the suspected content symbols is a plurality of the suspected content symbols, the traversal calculation is performed by the CRC algorithm, and the error symbols are determined in each of the suspected content symbols.
Specifically, if the number of suspected content symbols, which may have errors, in each content symbol corresponding to the first information fragment is determined to be 1, the suspected content symbol may be determined to be an error symbol with an error;
if the number of suspected content symbols which are possibly wrong in each content symbol corresponding to the first information fragment is determined to be a plurality of, performing traversal calculation through a CRC algorithm, and determining the wrong symbol which is wrong in each suspected content symbol.
Step 503, correcting the error symbol.
Specifically, after determining an error symbol in which an error occurs in each content symbol corresponding to the first information piece, the carrier frequency and the bin Lei Mazi corresponding to the error symbol may be corrected.
Based on the content of the above embodiments, correcting the error symbol includes: and modifying the carrier frequency corresponding to the error symbol into the adjacent carrier frequency, wherein the code distance of the Gray code word corresponding to the bit of the suspected bit in the error symbol is increased by 1 or reduced by 1.
For example, if it is determined that the content symbol 1 corresponding to the first information segment is an error symbol in which an error occurs, the carrier frequency corresponding to the content symbol 1 corresponding to the first information segment is f1, the gray code words corresponding to the content symbols 1, b1, and f1 are 0, and the gray code words corresponding to the content symbols 1, b1, and f2 are 1, the carrier frequency corresponding to the content symbol 1 corresponding to the first information segment may be modified to f2, and the gray code words corresponding to the content symbols 1, b1, and f1 may be modified to 1.
Step 504, based on each corrected content symbol, obtaining an information fragment.
After correcting the carrier frequency and the bin Lei Mazi corresponding to the error symbol, the first information segment may be obtained based on the carrier frequency and the gray code word of each corrected content symbol corresponding to the first information segment.
According to the embodiment of the invention, under the condition that the MFSK signal corresponding to the information fragment in the MFSK signal to be demodulated is obtained, based on a predefined symbol template, the carrier frequency corresponding to the content symbol of each bit corresponding to the information fragment and the carrier frequency corresponding to the check symbol, the Gray code word corresponding to the bit of each bit in the content symbol of each bit corresponding to the information fragment and the Gray code word corresponding to the bit of each bit in the check symbol corresponding to the information fragment are obtained, and further, under the condition that the error symbol with errors is determined in each content symbol corresponding to the information fragment based on each Gray code word, the error symbol is corrected, and further, the information fragment can be obtained based on each corrected content symbol corresponding to the information fragment, carrier frequency drift caused by satellite dynamic Doppler effect can be found in information demodulation, images of the MFSK signal by satellite dynamic Doppler effect in satellite communication can be reduced, the accuracy rate of the MFSK signal in satellite communication can be improved, and the satellite communication efficiency and the satellite transmission bandwidth utilization rate can be improved.
Based on the foregoing embodiments, after verifying the information segment based on the predefined symbol template and the carrier frequency of the MFSK signal, the method further includes: in the case where it is determined that the information piece passes the verification, the information piece is acquired based on each content symbol.
Specifically, in the case where the verification symbol and the check symbol coincide, it may be determined that the first piece of information passes the check.
When it is determined that the first information piece passes the verification, the first information piece may be acquired based on a carrier frequency and a gray code word of each content symbol corresponding to the first information piece.
Fig. 6 is a schematic structural diagram of an information modulation apparatus provided by the present invention. The information modulation apparatus provided by the present invention will be described below with reference to fig. 6, and the information modulation apparatus described below and the information modulation method provided by the present invention described above may be referred to correspondingly. As shown in fig. 6, the apparatus includes: an information segmentation module 601, a hamming code encoding module 602, and an MFSK modulation module 603.
An information dividing module 601, configured to divide target information into a plurality of information pieces in order from beginning to end with two bytes as an interval;
The hamming code encoding module 602 is configured to perform interleaving processing on the information segment, obtain content symbols of each bit corresponding to the information segment, and perform hamming code encoding on each content symbol to generate a check symbol corresponding to the information segment;
the MFSK modulation module 603 is configured to perform multi-system digital frequency modulation MFSK on each content symbol and the check symbol based on a predefined symbol template, to obtain an MFSK signal corresponding to the information segment;
the symbol templates are constructed based on the coding mode of Gray codes and are used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi;
the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in the content symbols of any two different bits is different.
Specifically, the information dividing module 601, the hamming code encoding module 602, and the MFSK modulation module 603 are electrically connected.
After each content symbol and check symbol corresponding to each information segment are generated through interleaving processing and hamming code encoding, MFSK modulation is performed on each content symbol and check symbol based on a predefined symbol template, the MFSK signal corresponding to each information segment is obtained, the symbol template is constructed based on a gray code encoding method, and is used for describing mapping relations between content symbols with different bit numbers and carrier waves with different frequency in symbols with different bit numbers, and each gray code word change frequency corresponding to carrier waves with different frequency in a target bit number in a content symbol with any bit number in the symbol template is larger than each gray code change frequency corresponding to carrier waves with different frequency in a non-target bit number in the content symbol, and the target bit number in any two content symbols with different bit numbers in the symbol template is different, so that the capability of resisting satellite dynamic doppler effect of the modulated MFSK signal in satellite communication can be improved, the capability of the satellite dynamic doppler effect of the satellite sk signal can be reduced, the communication efficiency of the satellite sk signal can be improved, the communication accuracy of the satellite communication can be improved, and the communication bandwidth of the MFSK signal can be further improved, and the communication rate of the satellite sk signal can be improved.
Fig. 7 is a schematic diagram of the structure of the information demodulating apparatus according to the present invention. The information demodulation apparatus provided by the present invention will be described below with reference to fig. 7, and the information demodulation apparatus described below and the information demodulation method provided by the present invention described above may be referred to correspondingly with each other. As shown in fig. 7, the apparatus includes: an information fragment verification module 701, an error symbol determination module 702, an error symbol correction module 703, and an information demodulation module 704.
The information segment verification module 701 is configured to obtain a multi-system digital frequency modulation MFSK signal corresponding to an information segment, and verify the information segment based on a predefined symbol template and a carrier frequency of the MFSK signal;
an error symbol determining module 702, configured to determine, in the case where it is determined that the information segment fails to pass the verification, an error symbol in which an error occurs in each content symbol corresponding to the information segment;
an error symbol correction module 703, configured to correct an error symbol;
an information demodulation module 704, configured to obtain an information segment based on each corrected content symbol;
the symbol templates are constructed based on the coding mode of Gray codes and are used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi;
The change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in the content symbols of any two different bits is different;
the MFSK signal corresponding to the information fragment is modulated based on the following steps:
dividing the target information into a plurality of information fragments by taking two bytes as an interval according to the sequence from beginning to end;
interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments;
and carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining an MFSK signal corresponding to the information fragment.
Specifically, the information fragment verification module 701, the error symbol determination module 702, the error symbol correction module 703, and the information demodulation module 704 are electrically connected.
According to the information demodulation device in the embodiment of the invention, when the MFSK signal corresponding to the information fragment in the MFSK signal to be demodulated is acquired, based on a predefined symbol template, the carrier frequency corresponding to the content symbol of each bit corresponding to the information fragment and the carrier frequency corresponding to the check symbol, the Gray code word corresponding to the bit of each bit in the content symbol of each bit corresponding to the information fragment and the Gray code word corresponding to the bit of each bit in the check symbol corresponding to the information fragment are acquired, and further, when the error symbol with the error is determined in each content symbol corresponding to the information fragment based on each Gray code word, the error symbol is corrected, and further, the information fragment can be acquired based on each corrected content symbol corresponding to the information fragment, carrier frequency drift caused by satellite dynamic Doppler effect can be found in information demodulation, images of the MFSK signal by satellite dynamic Doppler effect in satellite communication can be reduced, satellite communication accuracy rate of the MFSK signal can be improved, and satellite communication efficiency and satellite transmission bandwidth utilization rate can be improved.
Fig. 8 illustrates a physical structure diagram of an electronic device, as shown in fig. 8, which may include: processor 810, communication interface (Communications Interface) 820, memory 830, and communication bus 840, wherein processor 810, communication interface 820, memory 830 accomplish communication with each other through communication bus 840. Processor 810 may invoke logic instructions in memory 830 to perform information modulation methods and/or information demodulation methods. The information modulation method comprises the following steps: dividing the target information into a plurality of information fragments by taking two bytes as an interval according to the sequence from beginning to end; interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments; carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining an MFSK signal corresponding to the information fragment; the symbol templates are constructed based on the coding mode of Gray codes and are used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi; the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in the content symbols of any two different bits is different. The information demodulation method comprises the following steps: acquiring a multi-system digital frequency Modulation (MFSK) signal corresponding to the information fragment, and checking the information fragment based on a predefined symbol template and the carrier frequency of the MFSK signal; under the condition that the information fragment is determined to pass the verification, determining an error symbol with error in each content symbol corresponding to the information fragment; correcting the error symbol; acquiring an information fragment based on each corrected content symbol; the symbol templates are constructed based on the coding mode of Gray codes and are used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi; the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in the content symbols of any two different bits is different; the MFSK signal corresponding to the information fragment is modulated based on the following steps: dividing the target information into a plurality of information fragments by taking two bytes as an interval according to the sequence from beginning to end; interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments; and carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining an MFSK signal corresponding to the information fragment.
Further, the logic instructions in the memory 830 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program, the computer program being storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of performing the information modulation method and/or the information demodulation method provided by the methods described above. The information modulation method comprises the following steps: dividing the target information into a plurality of information fragments by taking two bytes as an interval according to the sequence from beginning to end; interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments; carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining an MFSK signal corresponding to the information fragment; the symbol templates are constructed based on the coding mode of Gray codes and are used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi; the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in the content symbols of any two different bits is different. The information demodulation method comprises the following steps: acquiring a multi-system digital frequency Modulation (MFSK) signal corresponding to the information fragment, and checking the information fragment based on a predefined symbol template and the carrier frequency of the MFSK signal; under the condition that the information fragment is determined to pass the verification, determining an error symbol with error in each content symbol corresponding to the information fragment; correcting the error symbol; acquiring an information fragment based on each corrected content symbol; the symbol templates are constructed based on the coding mode of Gray codes and are used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi; the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in the content symbols of any two different bits is different; the MFSK signal corresponding to the information fragment is modulated based on the following steps: dividing the target information into a plurality of information fragments by taking two bytes as an interval according to the sequence from beginning to end; interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments; and carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining an MFSK signal corresponding to the information fragment.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the information modulation method and/or the information demodulation method provided by the above methods. The information modulation method comprises the following steps: dividing the target information into a plurality of information fragments by taking two bytes as an interval according to the sequence from beginning to end; interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments; carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining an MFSK signal corresponding to the information fragment; the symbol templates are constructed based on the coding mode of Gray codes and are used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi; the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in the content symbols of any two different bits is different. The information demodulation method comprises the following steps: acquiring a multi-system digital frequency Modulation (MFSK) signal corresponding to the information fragment, and checking the information fragment based on a predefined symbol template and the carrier frequency of the MFSK signal; under the condition that the information fragment is determined to pass the verification, determining an error symbol with error in each content symbol corresponding to the information fragment; correcting the error symbol; acquiring an information fragment based on each corrected content symbol; the symbol templates are constructed based on the coding mode of Gray codes and are used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi; the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency of the bit of the non-target bit in the content symbol of any bit, and the target bit in the content symbols of any two different bits is different; the MFSK signal corresponding to the information fragment is modulated based on the following steps: dividing the target information into a plurality of information fragments by taking two bytes as an interval according to the sequence from beginning to end; interleaving the information fragments to obtain content symbols of each bit corresponding to the information fragments, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information fragments; and carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining an MFSK signal corresponding to the information fragment.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (12)

1. An information modulation method, comprising:
dividing the target information into a plurality of information fragments with two bytes as intervals according to the sequence from beginning to end, wherein each information fragment comprises 16 bits arranged according to the sequence from beginning to end;
interleaving the 16 bits in each information segment to obtain content symbols with 4 bit numbers corresponding to each information segment, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information segments, wherein the content symbols with different bit numbers are formed by bit arrangements with different bit numbers in each information segment;
Performing multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and acquiring an MFSK signal corresponding to the information fragment;
the symbol template is constructed based on the coding mode of Gray codes and is used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi;
the change frequency of each Gray code word corresponding to the carrier wave of each frequency corresponding to the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency corresponding to the bit of the non-target bit in the content symbol of any bit, and the target bit in any two content symbols of different bit are different.
2. The information modulation method according to claim 1, wherein the method further comprises, before dividing the target information into pieces of information in order from beginning to end at intervals of two bytes:
Acquiring original information;
generating Cyclic Redundancy Check (CRC) information of the original information, and splicing the CRC information to the tail of the original information to obtain the target information.
3. The information modulation method according to claim 1 or 2, characterized in that the information modulation method is used for satellite communication.
4. An information demodulation method, comprising:
acquiring a multi-system digital frequency Modulation (MFSK) signal corresponding to an information fragment, and checking the information fragment based on a predefined symbol template and the carrier frequency of the MFSK signal;
under the condition that the information fragment is determined to not pass the verification, determining an error symbol with error in each content symbol corresponding to the information fragment;
correcting the error symbol;
acquiring the information fragment based on the carrier frequency and Gray code word of each content symbol after correction corresponding to the information fragment;
the symbol template is constructed based on the coding mode of Gray codes and is used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi;
The change frequency of each Gray code word corresponding to the carrier wave of each frequency corresponding to the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency corresponding to the bit of the non-target bit in the content symbol of any bit, and the target bit in any two content symbols of different bit are different;
the MFSK signal corresponding to the information fragment is modulated based on the following steps:
dividing the target information into a plurality of information fragments with two bytes as intervals according to the sequence from beginning to end, wherein each information fragment comprises 16 bits arranged according to the sequence from beginning to end;
interleaving the 16 bits in each information segment to obtain content symbols with 4 bit numbers corresponding to each information segment, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information segments, wherein the content symbols with different bit numbers are formed by bit arrangements with different bit numbers in each information segment;
and carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on the symbol template, and obtaining the MFSK signal corresponding to the information fragment.
5. The method of information demodulation according to claim 4, wherein the verifying the information piece based on a predefined symbol template and a carrier frequency of the MFSK signal comprises:
based on the symbol template and the carrier frequency of the MFSK signal, acquiring a Gray code word corresponding to each bit in each bit of the content symbol corresponding to the information fragment and a Gray code word corresponding to each bit in the check symbol corresponding to the information fragment;
based on each Gray code word, acquiring a content symbol and a check symbol of each bit corresponding to the information fragment;
carrying out Hamming code encoding on each content symbol to obtain a verification symbol corresponding to the information fragment;
and determining whether the information fragment passes verification based on whether the verification symbol and the verification symbol are consistent.
6. The method according to claim 5, wherein the determining, in the case where it is determined that the information piece does not pass the verification, an error symbol in which an error occurs in each content symbol corresponding to the information piece includes:
determining suspected bit times of bits with possible errors based on the verification symbol and the bit times of inconsistent values in the verification symbol;
If the code distance between the adjacent carrier frequency of the carrier frequency corresponding to the content symbol of any bit corresponding to the information fragment and the gray code word corresponding to the bit of the suspected bit in the content symbol of any bit found in the symbol template based on the suspected bit is 1, determining that the content symbol of any bit corresponding to the information fragment is a suspected content symbol;
and determining the error symbol based on the suspected content symbol.
7. The method of information demodulation according to claim 6, wherein the determining the error symbol based on the suspected content symbol comprises:
determining the suspected content symbols as error symbols when the number of the suspected content symbols is 1, performing traversal calculation through a CRC algorithm when the number of the suspected content symbols is a plurality of the suspected content symbols, and determining the error symbols in the suspected content symbols;
wherein the target information is obtained by:
Acquiring original information;
generating Cyclic Redundancy Check (CRC) information of the original information, and splicing the CRC information to the tail of the original information to obtain the target information.
8. The method of information demodulation according to claim 5, wherein after the verification of the information piece based on a predefined symbol template and a carrier frequency of the MFSK signal, the method further comprises:
and acquiring the information fragment based on each content symbol under the condition that the information fragment passes the verification.
9. The method of information demodulation according to claim 6, wherein said correcting the error symbol comprises:
and modifying the carrier frequency corresponding to the error symbol into the adjacent carrier frequency, wherein the code distance of the Gray code word corresponding to the bit of the suspected bit in the error symbol is increased by 1 or reduced by 1.
10. The information demodulation method according to any one of claims 4 to 9, wherein the information demodulation method is used for satellite communication.
11. An information modulation apparatus, comprising:
the information segmentation module is used for segmenting the target information into a plurality of information fragments with two bytes as intervals according to the sequence from beginning to end, and each information fragment comprises 16 bits arranged according to the sequence from beginning to end;
The Hamming code coding module is used for conducting interleaving processing on 16 bits in each information fragment, after obtaining content symbols with 4 bit numbers corresponding to each information fragment, conducting Hamming code coding on the content symbols to generate check symbols corresponding to the information fragments, wherein the content symbols with different bit numbers are formed by bit arrangements with different bit numbers in each information fragment;
the MFSK modulation module is used for carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on a predefined symbol template, and obtaining an MFSK signal corresponding to the information fragment;
the symbol template is constructed based on the coding mode of Gray codes and is used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi;
the change frequency of each Gray code word corresponding to the carrier wave of each frequency corresponding to the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency corresponding to the bit of the non-target bit in the content symbol of any bit, and the target bit in any two content symbols of different bit are different.
12. An information demodulation apparatus, comprising:
the information fragment verification module is used for acquiring a multi-system digital frequency Modulation (MFSK) signal corresponding to an information fragment, and verifying the information fragment based on a predefined symbol template and the carrier frequency of the MFSK signal;
the error symbol determining module is used for determining error symbols with errors in the content symbols corresponding to the information fragments under the condition that the information fragments are determined to not pass the verification;
the error symbol correction module is used for correcting the error symbol;
the information demodulation module is used for acquiring the information fragment based on the carrier frequency and Gray code word of each content symbol after correction corresponding to the information fragment;
the symbol template is constructed based on the coding mode of Gray codes and is used for describing content symbols with different bit numbers, bits with different bit numbers in the content symbols and carriers with different frequencies, mapping relations between the content symbols with different bit numbers in different cells Lei Mazi, and mapping relations between the check symbols with different bit numbers and carriers with different frequencies and different cells Lei Mazi;
the change frequency of each Gray code word corresponding to the carrier wave of each frequency corresponding to the bit of the target bit in the content symbol of any bit in the symbol template is larger than the change frequency of each Gray code word corresponding to the carrier wave of each frequency corresponding to the bit of the non-target bit in the content symbol of any bit, and the target bit in any two content symbols of different bit are different;
The MFSK signal corresponding to the information fragment is modulated based on the following steps:
dividing the target information into a plurality of information fragments with two bytes as intervals according to the sequence from beginning to end, wherein each information fragment comprises 16 bits arranged according to the sequence from beginning to end;
interleaving the 16 bits in each information segment to obtain content symbols with 4 bit numbers corresponding to each information segment, and then carrying out Hamming code encoding on each content symbol to generate check symbols corresponding to the information segments, wherein the content symbols with different bit numbers are formed by bit arrangements with different bit numbers in each information segment;
and carrying out multi-system digital frequency Modulation (MFSK) on each content symbol and each check symbol based on the symbol template, and obtaining the MFSK signal corresponding to the information fragment.
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