CN113556206B - Anti-interference communication system, method, computer device and storage medium - Google Patents
Anti-interference communication system, method, computer device and storage medium Download PDFInfo
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- CN113556206B CN113556206B CN202010320009.6A CN202010320009A CN113556206B CN 113556206 B CN113556206 B CN 113556206B CN 202010320009 A CN202010320009 A CN 202010320009A CN 113556206 B CN113556206 B CN 113556206B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
- H04L1/0043—Realisations of complexity reduction techniques, e.g. use of look-up tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0052—Realisations of complexity reduction techniques, e.g. pipelining or use of look-up tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—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
Abstract
The application relates to an anti-interference communication system, an anti-interference communication method, a computer device and a storage medium. The system comprises: the transmitting end is used for carrying out spread spectrum repetition on the transmitting signal to obtain a spread spectrum signal; the transmitting end is also used for interleaving the spread spectrum signals according to a preset signal interleaving table to obtain interleaved signals, and transmitting the interleaved signals to the receiving end through a plurality of frequency points; the receiving end is used for receiving the interleaved signals, determining interfered frequency points in the plurality of frequency points, deleting the interleaved signals corresponding to the interfered frequency points, and obtaining interference-free signals; the receiving end is also used for obtaining a transmitting signal according to the interference-free signal. The method can reduce the operation complexity, is easy to calculate in parallel and is realized in a broadband system.
Description
Technical Field
The present application relates to the field of wireless communications technologies, and in particular, to an anti-interference communication system, a method, a computer device, and a storage medium.
Background
Complicated electromagnetic interference exists in a wireless communication environment, and the interference is easily caused by deliberate interference of enemy in the field of military communication, so that the performance of a received signal is reduced, and thus, anti-interference communication is an important technology in the field of wireless communication.
The traditional wireless communication system realizes anti-interference by using time diversity through an interleaving spread spectrum technology, a transmitter spreads a modulation signal, a scrambling code whitens, then random interleaving is disturbed, and the modulation signal is transmitted through an antenna. After receiving the signals, the receiver identifies the undisturbed signals, de-interleaves, descrambles and despreads the undisturbed signals, and then sends the signals to a demodulation decoder.
However, in the conventional anti-interference communication system, random interleaving is used, the generation of the random interleaver depends on random number seeds, and in the interleaving and de-interleaving process, the operation complexity is high, and parallel processing is difficult, so that the method is not beneficial to implementation in a broadband communication system.
Therefore, the conventional anti-interference communication has a problem of high operation complexity.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an anti-interference communication system, method, computer device, and storage medium that can reduce the complexity of operations.
An interference-free communication system, the system comprising: a transmitting end and a receiving end,
the transmitting end is used for carrying out spread spectrum repetition on the transmitting signal to obtain a spread spectrum signal;
the transmitting end is further configured to interleave the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal, and transmit the interleaved signal to the receiving end through a plurality of frequency points;
The receiving end is used for receiving the interleaved signal, determining an interfered frequency point in the plurality of frequency points, deleting the interleaved signal corresponding to the interfered frequency point, and obtaining an interference-free signal;
the receiving end is further configured to obtain the transmission signal according to the interference-free signal.
In one embodiment, the transmitting end is further configured to number the spread spectrum signal to obtain a signal number, and obtain the interleaved signal according to the signal number.
In one embodiment, the receiving end is further configured to deinterleave the interference-free signal to obtain a deinterleaved signal;
the receiving end is further used for despreading the deinterleaved signals to obtain despread signals;
the receiving end is further configured to perform channel decoding on the despread signal to obtain the transmission signal.
In one embodiment, the signal interleaving table is obtained by traversing a search method, so that performance degradation caused by deleting the interleaved signal corresponding to the interfered frequency point is matched with performance gain caused by the channel decoding.
In one embodiment, the transmission signal comprises a modulated signal; the transmitting end is further used for carrying out channel coding on the transmitting signal to obtain a coded signal;
The transmitting end is further configured to modulate the encoded signal to obtain the modulated signal.
In one embodiment, the transmitting end is further configured to number the transmitting signal to obtain a signal number, and obtain the interleaved signal according to the signal number and the signal interleaving table.
A method of tamper-resistant communication, the method comprising:
performing spread spectrum repetition on the transmission signal to obtain a spread spectrum signal;
interleaving the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal;
transmitting the interweaved signals to a receiving end through a plurality of frequency points; the receiving end is used for determining an interfered frequency point in the plurality of frequency points after receiving the interleaved signal, deleting the interleaved signal corresponding to the interfered frequency point to obtain an interference-free signal, and obtaining the transmitting signal according to the interference-free signal.
A method of tamper-resistant communication, the method comprising:
receiving an interleaved signal; the interleaving signals are obtained by performing spread spectrum repetition on the transmission signals through a transmitting end to obtain spread spectrum signals and interleaving the spread spectrum signals according to a preset signal interleaving table; the interleaving signal is sent to a receiving end through a plurality of frequency points;
Determining an interfered frequency point in the plurality of frequency points, and deleting the interweaved signals corresponding to the interfered frequency point to obtain an interference-free signal;
and obtaining the sending signal according to the interference-free signal.
A computer device comprising a memory storing a computer program and a processor which when executing the computer program performs the steps of:
performing spread spectrum repetition on the transmission signal to obtain a spread spectrum signal;
interleaving the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal;
transmitting the interweaved signals to a receiving end through a plurality of frequency points; the receiving end is used for determining an interfered frequency point in the plurality of frequency points after receiving the interleaved signal, deleting the interleaved signal corresponding to the interfered frequency point to obtain an interference-free signal, and obtaining the transmitting signal according to the interference-free signal.
A computer device comprising a memory storing a computer program and a processor which when executing the computer program performs the steps of:
receiving an interleaved signal; the interleaving signals are obtained by performing spread spectrum repetition on the transmission signals through a transmitting end to obtain spread spectrum signals and interleaving the spread spectrum signals according to a preset signal interleaving table; the interleaving signal is sent to a receiving end through a plurality of frequency points;
Determining an interfered frequency point in the plurality of frequency points, and deleting the interweaved signals corresponding to the interfered frequency point to obtain an interference-free signal;
and obtaining the sending signal according to the interference-free signal.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
performing spread spectrum repetition on the transmission signal to obtain a spread spectrum signal;
interleaving the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal;
transmitting the interweaved signals to a receiving end through a plurality of frequency points; the receiving end is used for determining an interfered frequency point in the plurality of frequency points after receiving the interleaved signal, deleting the interleaved signal corresponding to the interfered frequency point to obtain an interference-free signal, and obtaining the transmitting signal according to the interference-free signal.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
receiving an interleaved signal; the interleaving signals are obtained by performing spread spectrum repetition on the transmission signals through a transmitting end to obtain spread spectrum signals and interleaving the spread spectrum signals according to a preset signal interleaving table; the interleaving signal is sent to a receiving end through a plurality of frequency points;
Determining an interfered frequency point in the plurality of frequency points, and deleting the interweaved signals corresponding to the interfered frequency point to obtain an interference-free signal;
and obtaining the sending signal according to the interference-free signal.
According to the anti-interference communication system, the anti-interference communication method, the computer equipment and the storage medium, the transmitting end is used for carrying out spread spectrum repetition on the transmitting signal to obtain the spread spectrum signal, a copy of the transmitting signal can be obtained, and when the transmitting signal is interfered, the receiving end can receive the copy of the transmitting signal, so that the signal transmission performance is ensured; interleaving the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal, and transmitting the interleaved signal to a receiving end through a plurality of frequency points, so that the operation complexity can be reduced, and as many signals or signal copies as possible are ensured to be received on fewer frequency points, and the signal transmission performance is ensured; the receiving end receives the interleaved signal, determines the interfered frequency point in the plurality of frequency points, deletes the interleaved signal corresponding to the interfered frequency point to obtain an interference-free signal, and obtains a transmitting signal according to the interference-free signal, thereby eliminating the influence of interference on signal decoding, improving the anti-interference performance of the system, reducing the operation complexity of the system, being easy to calculate in parallel and being realized in a broadband system.
Drawings
FIG. 1 is a block diagram of an interference-free communication system in one embodiment;
FIG. 2 is a diagram of simulation results of the number of data blocks after combining the undisturbed scrambling points in one embodiment;
FIG. 3 is a simulated comparison of block interleaving and random interleaving immunity in one embodiment;
FIG. 4 is a flow chart of an anti-interference communication method in one embodiment;
FIG. 5 is a flow chart of an anti-interference communication method according to another embodiment;
fig. 6 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In one embodiment, as shown in fig. 1, an anti-interference communication system is provided, which includes a transmitting end 102 and a receiving end 104, wherein the transmitting end 102 transmits a wireless communication signal to the receiving end 104. The transmitting end 102 may be a terminal device in a public mobile communication system or a base station in a public mobile communication system. The receiving end 104 may be a terminal device in a public mobile communication system or a base station in a public mobile communication system.
And the transmitting end 102 is configured to perform spread spectrum repetition on the transmission signal to obtain a spread spectrum signal.
Wherein the transmission signal is a signal bit sequence to be transmitted.
The spread spectrum repetition is a spread spectrum method for copying the signal and generating a plurality of copies of the transmitted signal.
In a specific implementation, when the transmitting end 102 needs to transmit a signal, the transmitting end may perform channel coding on the transmitting signal to obtain a coded signal, then modulate the coded signal to obtain a modulated signal, and copy the modulated signal into multiple copies through spread spectrum repetition to obtain a spread spectrum signal.
In practical applications, in order to increase the signal processing speed, the modulated signal may be converted into a plurality of modulated signal blocks, and then the modulated signal blocks are processed later, so that the symbol-by-symbol processing manner is replaced by the code-block-by-symbol processing manner. Specifically, a modulation signal sequence can be uniformly divided into n subsequences, each subsequence is subjected to row-column interleaving to obtain n modulation signal blocks, and k times of spread spectrum repetition can be performed on the n modulation signal blocks to obtain n×k spread spectrum signal blocks; the method can also directly perform row-column interleaving on the modulated signal sequence to obtain an interleaving block, and then uniformly divide the interleaving block into m sub-blocks, wherein each sub-block is a modulated signal block, and then m modulated signal blocks can be subjected to spread spectrum repetition to obtain m multiplied by k spread spectrum signal blocks.
For example, for a series of signal sequences with a length of 2048 bits, after passing through a Turbo encoder with a 1/2 code rate, the signal sequences with a length of 4096 bits are modulated by QPSK (Quadrature Phase Shift Keying ), so as to obtain 2048 symbols, the 2048 symbols are interleaved in rows and columns, and the signals are uniformly divided into 16 modulated signal blocks, wherein each modulated signal block has 128 symbols, and the 16 modulated signal blocks are 8 times spread, so as to obtain 128 spread signal blocks.
The transmitting end 102 is further configured to interleave the spread spectrum signal according to a preset signal interleaving table, obtain an interleaved signal, and send the interleaved signal to the receiving end through a plurality of frequency points.
The signal interleaving table is a table for recording the mapping relation between frequency points and spread spectrum signals.
In a specific implementation, after a series of spread spectrum signal sequences are obtained by the transmitting end 102, spread spectrum signals in the series of spread spectrum signal sequences may be numbered in sequence to obtain signal numbers, and the signal interleaving table may record a mapping relationship between frequency points and signal numbers of the spread spectrum signals, so that frequency points corresponding to each signal number may be searched according to the signal interleaving table, an interleaved signal may be generated, and the corresponding spread spectrum signals may be transmitted through corresponding frequency points, where the transmitting frequency points may be N frequency points f of the transmitting end 102 in fig. 1 1 ，f 2 ，……f N 。
In practical application, as shown in table 1, an example of a signal interleaving table is provided, in which a mapping relationship between a transmission frequency point (or a reception frequency point) and a signal number of a spread spectrum signal is recorded. After the 2048-bit signal passes through a Turbo encoder with a 1/2 code rate, a 4096-bit coded signal is generated, 2048 symbols are obtained through QPSK modulation, the 2048 symbols can be uniformly divided into 16 modulated signal blocks, and the modulated signal blocks are numbered by {1, 2, 3, … …, 16}, wherein each modulated signal block has 128 symbols. The 8-times spread spectrum repetition is performed on the 16 modulated signal blocks, so that 128 spread spectrum signal blocks can be obtained, wherein the signal numbers of the spread spectrum signal blocks can be {1, … …, 1, 2, … …, 2, 3 … … }. According to table 1, 16 transmission frequency points (or reception frequency points) respectively correspond to 8 designated signal numbers for transmitting 8 spread spectrum signal blocks. After determining the signal number corresponding to the frequency point, the corresponding spread spectrum signal block can be determined according to the signal number, and the spread spectrum signal block is sent out through the frequency point. For example, according to table 1, the signal numbers corresponding to the frequency bin 1 are 1, 2, 6, 7, 8, 9, 10, 13, and the spread signal block corresponding to the signal number can be obtained and transmitted to the receiving end 104 through the frequency bin 1.
TABLE 1
The signal interleaving table may be obtained by traversing a search method, and the search target may be set such that when the number of interference frequency points does not exceed a certain number, the receiving end 104 deletes the signal (or signal block) at the interference frequency point, and de-interleaves and despreads the residual signal (or signal block), so that the minimum number of signals (or signal block) input to the decoder is the largest. As shown in table 1, it is assumed that the number of interference frequency points is not more than 14, that is, it is necessary to perform deinterleaving, despreading, and further decoding based on signals at least 2 frequency points in table 1. For example, when only the frequency point 15 and the frequency point 16 are not interfered, after deinterleaving and despreading, the obtained signal numbers are 2, 4, 5, 6, 7, 8, 9, 11, 12, 14 and 16, namely, the signal blocks need to be decoded according to the 11 signal blocks, and the signal block deletion ratio can be calculated to be 31.25%, and simulation shows that the Turbo code with the 1/2 code rate can resist 31.25% of signal deletion, so that the signal transmission quality can be ensured when the signal is received only through the frequency point 15 and the frequency point 16, and the channel interference can be effectively resisted.
And the receiving end 104 is configured to receive the interleaved signal, determine an interfered frequency point from the multiple frequency points, and delete the interleaved signal corresponding to the interfered frequency point to obtain an interference-free signal.
In a specific implementation, the receiving end 104 may compare N frequency points f of the receiving end 104 in fig. 1 1 ，f 2 ，……f N As a receiving frequency point, the receiving end 102 receives the interleaved signal and identifies whether the receiving frequency point is interfered, when the interference is serious and the correct decoding is not facilitated, the signal on the frequency point can be deleted, and the signal on the remaining frequency points is used for decoding. The receiving end 104 may also set the signal on the interfered frequency point to zero, and decode the signal on the remaining frequency point and the set zero frequency point.
For example, when frequency bins 1-12 in table 1 are disturbed, affecting proper decoding, only the signals on frequency bins 15 and 16 may be deinterleaved, despread, and fed to a decoder for decoding. Alternatively, as shown in table 2, the signals at frequency bins 1-12 may be zeroed, then the signals at frequency bins 1-16 may be deinterleaved, despread, and fed to a decoder for decoding.
| Frequency point | Signal numbering |
| 1-12 | 0 0 0 0 0 0 0 0 |
| 15 | 2 4 5 7 9 12 14 16 |
| 16 | 4 5 6 8 9 11 12 14 |
TABLE 2
The receiving end 104 is further configured to obtain a transmission signal according to the interference-free signal.
In a specific implementation, after obtaining the interference-free signal, the receiving end 104 equalizes, demodulates and deinterleaves the interference-free signal to obtain a deinterleaved signal sequence, despreads the deinterleaved signal sequence to obtain a despread signal sequence, and then inputs the despread signal sequence to a decoder for decoding. For example, according to table 2, after obtaining the interference-free signal, the interference-free signal may be deinterleaved to obtain deinterleaved signal sequences 2, 4, 5, 6, 7, 8, 9, 12, 11, 14, 12, 16, 14, and then despread to obtain despread signal sequences 2, 4, 5, 6, 7, 8, 9, 11, 12, 14, 16, and the despread signal sequences may be input to a decoder to be decoded, thereby obtaining the transmission signal of the transmitting terminal 102.
According to the anti-interference communication system, the sending end performs spread spectrum repetition on the sending signal to obtain the spread spectrum signal, so that a copy of the sending signal can be obtained, and when the sending signal is interfered, the receiving end can receive the copy of the sending signal, and the signal transmission performance is guaranteed; interleaving the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal, and transmitting the interleaved signal to a receiving end through a plurality of frequency points, so that the operation complexity can be reduced, and as many signals or signal copies as possible are ensured to be received on fewer frequency points, and the signal transmission performance is ensured; the receiving end receives the interleaved signal, determines the interfered frequency point in the plurality of frequency points, deletes the interleaved signal corresponding to the interfered frequency point to obtain an interference-free signal, and obtains a transmitting signal according to the interference-free signal, thereby eliminating the influence of interference on signal decoding, improving the anti-interference performance of the system, reducing the operation complexity of the system, being easy to calculate in parallel and being realized in a broadband system.
The following detailed description is presented to facilitate a thorough understanding of embodiments of the application by those skilled in the art.
The anti-interference communication system uniformly blocks the coded modulation signals to different frequency points after spread spectrum interleaving, and the data blocks can be correctly received by a receiver for the frequency points without interference, and the frequency points with interference can not be correctly received. The decoding output can be finally completed by identifying the interfered frequency points, setting the corresponding data blocks to zero, de-interleaving, de-spreading and sending the data blocks to a demodulation decoder.
The interference-free communication system may comprise the steps of:
a) The transmitting end codes and modulates the data, repeatedly spreads the modulation information, interweaves and scrambles the scrambling code, uniformly divides the modulation information into a plurality of blocks, transmits the blocks to different frequency points, and transmits the blocks through the transmitting antenna.
b) The receiving end sequentially receives signals at different frequency points, judges whether the signals on the frequency points are interfered or not, performs equalization and demodulation according to a normal flow if no interference exists, and sets all information on the interfered frequency points to zero if the signals are interfered.
c) And (3) collecting information on all frequency points including the zero frequency point, descrambling, deinterleaving and despreading the information, and then sending the information to a decoder.
In order to ensure the real-time performance of transmission, data is generally scattered to 16 frequency points for frequency hopping and transmission, and if each frequency point is interfered with a probability p, if all 16 frequency points are interfered with (the probability is p 16 ) The whole packet data cannot be received correctly, if 15 frequency points are interfered (probability is 16p 15 (1-p)), in which case the data cannot be correctly received due to insufficient redundancy of encoding, it is desirable that the data be successfully decoded when data of at least 2 frequency points are correctly received. Because the data of the two frequency points are scattered randomly after spreading, the less and better the data of the spreading repetition in any two frequency points are expected, the more and better the different data are, thus being beneficial to final decoding. For the convenience of explanation, assume that the information length is 2048 bits, 4096 bits are obtained after 1/2Turbo coding, QPSK is modulated into 2048 symbols, the 2048 symbol row-column interleaving is uniformly divided into 16 blocks, 128 symbols are each block, the spreading multiple is 8 times, and 128 blocks are obtained after 8 times of spreading interleaving scrambling According to the above, 8 data blocks are effectively transmitted per frequency bin. Block interleaving is adopted to maximize the minimum number of data blocks after any 2 frequency points are combined. By traversing the search, a block interleaving manner as shown in table 1 can be found, and the minimum number of data blocks after any 2 frequency points are combined is 11. The 1/2Turbo codes have 16 blocks of data, and at least receiving 11 blocks of data means that the deletion rate is at most 31.25%, and the 1/2Turbo codes can resist 31.25% deletion.
Fig. 2 provides simulation results of the number of data blocks after any 2 frequency points are combined, and it can be seen that the minimum number of data blocks after any 2 frequency points are combined is 11.
Fig. 3 provides simulation comparison results of interference resistance of block interleaving and random interleaving, assuming that the interference probability is p, applying interference to 16 frequency points according to the interference probability p, assuming that the identification of the interference is 100% accurate, deleting information of interference frequency points, despreading and descrambling according to an interleaving mode of table 1, and then sending the information to a decoder. The demodulation threshold is set as the minimum signal-to-noise ratio when the packet success rate is more than 90%, as can be seen from fig. 3, the performance of block interleaving and random interleaving is equivalent under the condition of spread spectrum anti-interference, but the block interleaving mode can greatly reduce the operation complexity of interleaving and de-interleaving, is suitable for parallel calculation, and is more beneficial to realizing broadband waveforms.
In an embodiment, the transmitting end is further configured to number the spread spectrum signal to obtain a spread spectrum signal number, and obtain an interleaved signal according to the spread spectrum signal number.
The interleaving signals are signals corresponding to a plurality of frequency points and are output by interleaving according to a signal interleaving table.
In a specific implementation, after a series of spread spectrum signal sequences are obtained by a transmitting end, spread spectrum signals in the series of spread spectrum signal sequences can be numbered in sequence to obtain signal numbers, and a mapping relation between frequency points and the signal numbers of the spread spectrum signals can be recorded by a signal interleaving table, so that the frequency points corresponding to the signal numbers can be searched according to the signal interleaving table to generate interleaved signals, and the interleaved signals are transmitted through a plurality of frequency points.
In this embodiment, the transmitting end numbers the spread spectrum signal to obtain the number of the spread spectrum signal, and obtains the interleaved signal according to the number of the spread spectrum signal, so that the interleaved signal can be transmitted through the preset frequency point according to the signal interleaving table, and the anti-interference performance of signal transmission is improved.
In one embodiment, the receiving end is further configured to deinterleave the interference-free signal to obtain a deinterleaved signal; the receiving end is also used for despreading the deinterleaved signals to obtain despread signals; the receiving end is further configured to perform channel decoding on the despread signal to obtain a transmission signal.
In a specific implementation, after obtaining an interference-free signal, a receiving end deinterleaves the interference-free signal to obtain a deinterleaved signal sequence, despreads the deinterleaved signal sequence to obtain a despread signal sequence, and then inputs the despread signal sequence to a decoder for decoding. For example, according to table 2, after obtaining the interference-free signal, the interference-free signal may be deinterleaved to obtain deinterleaved signal sequences 2, 4, 5, 6, 7, 8, 9, 12, 11, 14, 12, 16, 14, and then despread to obtain despread signal sequences 2, 4, 5, 6, 7, 8, 9, 11, 12, 14, 16, and the despread signal sequences may be input to a decoder to be decoded, thereby obtaining a transmission signal at the transmitting end.
In this embodiment, the receiver deinterleaves the interference-free signal to obtain a deinterleaved signal, so that the deleted signal is as few as possible by using the randomness of the interfered frequency point; despreading the deinterleaved signal to obtain a despread signal, and removing the signal with repeated spread spectrum; and performing channel decoding on the despread signal to obtain a transmission signal, and obtaining an original signal transmitted by a transmitting end.
In one embodiment, the signal interleaving table is obtained by traversing a search method, so that performance degradation caused by deleting interleaved signals corresponding to the interfered frequency points is matched with performance gain caused by channel decoding.
In a specific implementation, the signal interleaving table can be obtained by traversing a search method, and the search target can be set to be that when the number of interference frequency points is not more than a certain number, the signal (or the signal block) on the interference frequency point is deleted at the receiving end, the de-interleaving and the de-spreading are performed through the residual signal (or the signal block), and the minimum value of the number of the signals (or the signal block) input into the decoder is maximum. Since the channel coding can bring performance gain to the signal transmission by adding redundancy, the performance of the signal transmission can be ensured when the performance gain can resist the performance degradation caused by the signal deletion at the interference frequency point.
For example, as shown in table 1, it is assumed that the number of interference frequency points is not more than 14, that is, it is necessary to perform deinterleaving, despreading, and further decoding based on signals at least at 2 frequency points in table 1. For example, when only the signals (or signal blocks) of the frequency point 15 and the frequency point 16 are subjected to deinterleaving and despreading, the obtained signal numbers are 2, 4, 5, 6, 7, 8, 9, 11, 12, 14 and 16, namely, the signals need to be decoded according to the 11 signal blocks, and the signal block deletion ratio can be calculated to be 31.25%, and simulation shows that the Turbo coding with the 1/2 code rate can resist 31.25% of signal deletion, so that the signal transmission quality can be ensured when the signals are received only through the frequency point 15 and the frequency point 16, and the channel interference can be effectively resisted.
In this embodiment, the signal interleaving table is obtained by traversing the search method, so that signal deletion on the interfered frequency point can be matched with channel decoding gain, and signal transmission performance of the system can be ensured.
In one embodiment, the transmitting end is further configured to perform channel coding on a transmission signal to obtain a coded signal; the transmitting end is also used for modulating the coded signal to obtain a modulated signal.
In a specific implementation, when the transmitting end needs to transmit a signal, the signal can be firstly subjected to channel coding to obtain a coded signal, and then the coded signal is modulated to obtain a modulated signal.
In practical applications, in order to increase the signal processing speed, the modulated signal may be converted into a plurality of modulated signal blocks, and then the modulated signal blocks are processed later, so that the symbol-by-symbol processing manner is replaced by the code-block-by-symbol processing manner. Specifically, a modulation signal sequence can be uniformly divided into n subsequences, and each subsequence is subjected to row-column interleaving to obtain n modulation signal blocks; the modulated signal sequence can also be directly subjected to row-column interleaving to obtain an interleaving block, and then the interleaving block is uniformly divided into m sub-blocks, wherein each sub-block is a modulated signal block.
In this embodiment, the transmitting end performs channel coding on the transmitting signal to obtain a coded signal, so that the error rate of signal transmission can be reduced; modulating the coded signal to obtain a modulated signal; the encoded signal may be modulated onto a carrier wave for transmission.
In one embodiment, the transmitting end is further configured to number the transmission signal to obtain a signal number, and obtain an interleaved signal according to the signal number and the signal interleaving table.
In a specific implementation, when a transmitting end needs to transmit a signal, the transmitting end can firstly perform channel coding on the transmitting signal to obtain a coded signal, then modulate the coded signal to obtain a modulated signal, and then directly number the modulated signal without spreading and repeating, and generate an interleaving signal according to the obtained signal number and a signal interleaving table. For example, after obtaining 16 modulated signals, the modulated signals may be numbered in sequence {1, 2, 3, … …, 16}, and an interleaved signal may be generated directly according to the signal interleaving table shown in table 1, for example, modulated signals numbered 1, 2, 6, 7, 8, 9, 10, 13 are placed in sequence at frequency point 1, and so on. Accordingly, the receiving end can directly de-interleave according to the signal interleaving table without performing de-spreading processing.
In this embodiment, the transmitting end numbers the transmitting signal to obtain a signal number, and obtains an interleaved signal according to the signal number and the signal interleaving table, so that the operation complexity can be reduced.
In one embodiment, as shown in fig. 4, an anti-interference communication method is provided, and the method is applied to the transmitting end 102 in fig. 1 for illustration, and includes the following steps:
step S410, spread spectrum repetition is carried out on the transmitted signal to obtain a spread spectrum signal;
step S420, interleaving the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal;
step S430, transmitting the interleaved signal to the receiving end through a plurality of frequency points; and the receiving end is used for determining an interfered frequency point in the plurality of frequency points after receiving the interleaved signal, deleting the interleaved signal corresponding to the interfered frequency point to obtain an interference-free signal, and obtaining a transmitting signal according to the interference-free signal.
In a specific implementation, when the transmitting end 102 needs to transmit a signal, the transmitting end may perform channel coding on the transmitting signal to obtain a coded signal, then modulate the coded signal to obtain a modulated signal, and copy the modulated signal into multiple copies through spread spectrum repetition, so as to obtain a spread spectrum signal. After obtaining a series of spread spectrum signal sequences, the transmitting end 102 may sequentially number the spread spectrum signals therein to obtain signal numbers, and the signal interleaving table may record a mapping relationship between frequency points and the signal numbers of the spread spectrum signals, so as to search frequency points corresponding to each signal number according to the signal interleaving table, generate interleaved signals, and transmit the interleaved signals through corresponding frequency points. After receiving the interleaved signal, the receiving end 104 identifies whether the receiving frequency point is interfered, and when the interference is serious and the correct decoding is not facilitated, the signal on the frequency point can be deleted, and the signal on the remaining frequency points is used for decoding. The receiving end 104 may also set the signal on the interfered frequency point to zero, and decode the signal on the remaining frequency point and the set zero frequency point. After obtaining a series of interference-free signal sequences, the receiving end 104 deinterleaves the interference-free signal sequences to obtain deinterleaved signal sequences, despreads the deinterleaved signal sequences to obtain despread signal sequences, and the despread signal sequences can be input to a decoder for decoding.
Since the processing procedure of the transmitting end 102 is described in detail in the foregoing embodiments, the details are not repeated here.
In this embodiment, the transmitting end performs spread spectrum repetition on the transmitting signal to obtain a spread spectrum signal, so that a copy of the transmitting signal can be obtained, and when the transmitting signal is interfered, the receiving end can receive the copy of the transmitting signal, so as to ensure signal transmission performance; interleaving the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal, and transmitting the interleaved signal to a receiving end through a plurality of frequency points, so that the operation complexity can be reduced, and as many signals or signal copies as possible are ensured to be received on fewer frequency points, and the signal transmission performance is ensured; the receiving end receives the interleaved signal, determines the interfered frequency point in the plurality of frequency points, deletes the interleaved signal corresponding to the interfered frequency point to obtain an interference-free signal, and obtains a transmitting signal according to the interference-free signal, thereby eliminating the influence of interference on signal decoding, improving the anti-interference performance of the system, reducing the operation complexity of the system, being easy to calculate in parallel and being realized in a broadband system.
In one embodiment, as shown in fig. 5, another anti-interference communication method is provided, and the method is applied to the receiving end 104 in fig. 1 for illustration, and includes the following steps:
Step S510, receiving an interleaving signal; the interleaving signal is obtained by performing spread spectrum repetition on the transmission signal through the transmission end to obtain a spread spectrum signal and interleaving the spread spectrum signal according to a preset signal interleaving table; the interleaving signal is sent to a receiving end through a plurality of frequency points;
step S520, determining an interfered frequency point in a plurality of frequency points, deleting an interleaving signal corresponding to the interfered frequency point, and obtaining an interference-free signal;
step S530, according to the interference-free signal, a transmission signal is obtained.
In a specific implementation, when the transmitting end 102 needs to transmit a signal, the transmitting end may perform channel coding on the transmitting signal to obtain a coded signal, then modulate the coded signal to obtain a modulated signal, and copy the modulated signal into multiple copies through spread spectrum repetition, so as to obtain a spread spectrum signal. After obtaining a series of spread spectrum signal sequences, the transmitting end 102 may sequentially number the spread spectrum signals therein to obtain signal numbers, and the signal interleaving table may record a mapping relationship between frequency points and the signal numbers of the spread spectrum signals, so as to search frequency points corresponding to each signal number according to the signal interleaving table, generate interleaved signals, and transmit the interleaved signals through corresponding frequency points. After receiving the interleaved signal, the receiving end 104 identifies whether the receiving frequency point is interfered, and when the interference is serious and the correct decoding is not facilitated, the signal on the frequency point can be deleted, and the signal on the remaining frequency points is used for decoding. The receiving end 104 may also set the signal on the interfered frequency point to zero, and decode the signal on the remaining frequency point and the set zero frequency point. After obtaining a series of interference-free signal sequences, the receiving end 104 deinterleaves the interference-free signal sequences to obtain deinterleaved signal sequences, despreads the deinterleaved signal sequences to obtain despread signal sequences, and the despread signal sequences can be input to a decoder for decoding.
Since the processing procedure of the receiving end 104 is described in detail in the foregoing embodiments, the details are not repeated here.
In this embodiment, the transmitting end performs spread spectrum repetition on the transmitting signal to obtain a spread spectrum signal, so that a copy of the transmitting signal can be obtained, and when the transmitting signal is interfered, the receiving end can receive the copy of the transmitting signal, so as to ensure signal transmission performance; interleaving the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal, and transmitting the interleaved signal to a receiving end through a plurality of frequency points, so that the operation complexity can be reduced, and as many signals or signal copies as possible are ensured to be received on fewer frequency points, and the signal transmission performance is ensured; the receiving end receives the interleaved signal, determines the interfered frequency point in the plurality of frequency points, deletes the interleaved signal corresponding to the interfered frequency point to obtain an interference-free signal, and obtains a transmitting signal according to the interference-free signal, thereby eliminating the influence of interference on signal decoding, improving the anti-interference performance of the system, reducing the operation complexity of the system, being easy to calculate in parallel and being realized in a broadband system.
It should be understood that, although the steps in the flowcharts of fig. 4-5 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 4-5 may include multiple steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the steps or stages in other steps or other steps.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 6. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a method of tamper-resistant communication. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 6 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:
performing spread spectrum repetition on the transmission signal to obtain a spread spectrum signal;
interleaving the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal;
transmitting the interweaving signals to a receiving end through a plurality of frequency points; and the receiving end is used for determining an interfered frequency point in the plurality of frequency points after receiving the interleaved signal, deleting the interleaved signal corresponding to the interfered frequency point to obtain an interference-free signal, and obtaining a transmitting signal according to the interference-free signal.
In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:
Receiving an interleaved signal; the interleaving signal is obtained by performing spread spectrum repetition on the transmission signal through the transmission end to obtain a spread spectrum signal and interleaving the spread spectrum signal according to a preset signal interleaving table; the interleaving signal is sent to a receiving end through a plurality of frequency points;
determining an interfered frequency point in the plurality of frequency points, deleting an interweaved signal corresponding to the interfered frequency point, and obtaining an interference-free signal;
and obtaining a transmitting signal according to the interference-free signal.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
performing spread spectrum repetition on the transmission signal to obtain a spread spectrum signal;
interleaving the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal;
transmitting the interweaving signals to a receiving end through a plurality of frequency points; and the receiving end is used for determining an interfered frequency point in the plurality of frequency points after receiving the interleaved signal, deleting the interleaved signal corresponding to the interfered frequency point to obtain an interference-free signal, and obtaining a transmitting signal according to the interference-free signal.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
Receiving an interleaved signal; the interleaving signal is obtained by performing spread spectrum repetition on the transmission signal through the transmission end to obtain a spread spectrum signal and interleaving the spread spectrum signal according to a preset signal interleaving table; the interleaving signal is sent to a receiving end through a plurality of frequency points;
determining an interfered frequency point in the plurality of frequency points, deleting an interweaved signal corresponding to the interfered frequency point, and obtaining an interference-free signal;
and obtaining a transmitting signal according to the interference-free signal.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. An interference-free communication system, the system comprising: a transmitting end and a receiving end, characterized in that,
the transmitting end is used for carrying out spread spectrum repetition on the transmitting signal to obtain a spread spectrum signal;
the transmitting end is further configured to interleave the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal, and transmit the interleaved signal to the receiving end through a plurality of frequency points; the signal interleaving table is used for recording the mapping relation between the frequency points and the signal numbers of the spread spectrum signals; the transmitting end further determines a signal number corresponding to the frequency point according to the signal interleaving table, and transmits a spread spectrum signal corresponding to the signal number to the receiving end through the frequency point;
The receiving end is used for receiving the interleaved signal, determining an interfered frequency point in the plurality of frequency points, deleting the interleaved signal corresponding to the interfered frequency point, and obtaining an interference-free signal;
the receiving end is further configured to obtain the transmission signal according to the interference-free signal.
2. The system of claim 1, wherein the transmitting end is further configured to number the spread spectrum signal to obtain a spread spectrum signal number, and obtain the interleaved signal according to the spread spectrum signal number.
3. The system of claim 1, wherein the receiving end is further configured to deinterleave the interference-free signal to obtain a deinterleaved signal;
the receiving end is further used for despreading the deinterleaved signals to obtain despread signals;
the receiving end is further configured to perform channel decoding on the despread signal to obtain the transmission signal.
4. The system of claim 3 wherein said signal interleaving table is obtained by traversing a search method to match a performance degradation caused by said removing said interleaved signal corresponding to said interfered frequency point to a performance gain caused by said channel decoding.
5. The system of claim 1, wherein the transmitted signal comprises a modulated signal; the transmitting end is further used for carrying out channel coding on the transmitting signal to obtain a coded signal;
the transmitting end is further configured to modulate the encoded signal to obtain the modulated signal.
6. The system of claim 1, wherein the transmitting end is further configured to number the transmission signal to obtain a signal number, and obtain the interleaved signal according to the signal number and the signal interleaving table.
7. A method of tamper-resistant communication, the method comprising:
performing spread spectrum repetition on the transmission signal to obtain a spread spectrum signal;
interleaving the spread spectrum signal according to a preset signal interleaving table to obtain an interleaved signal, and transmitting the interleaved signal to a receiving end through a plurality of frequency points; the signal interleaving table is used for recording the mapping relation between the frequency points and the signal numbers of the spread spectrum signals; the transmitting end further determines a signal number corresponding to the frequency point according to the signal interleaving table, and transmits a spread spectrum signal corresponding to the signal number to the receiving end through the frequency point; the receiving end is used for determining an interfered frequency point in the plurality of frequency points after receiving the interleaved signal, deleting the interleaved signal corresponding to the interfered frequency point to obtain an interference-free signal, and obtaining the transmitting signal according to the interference-free signal.
8. A method of tamper-resistant communication, the method comprising:
receiving an interleaved signal; the method comprises the steps that a sending end conducts spread spectrum repetition on a sending signal to obtain a spread spectrum signal, the spread spectrum signal is interleaved according to a preset signal interleaving table to obtain an interleaved signal, and the interleaved signal is sent to a receiving end through a plurality of frequency points; the signal interleaving table is used for recording the mapping relation between the frequency points and the signal numbers of the spread spectrum signals; the transmitting end further determines a signal number corresponding to the frequency point according to the signal interleaving table, and transmits a spread spectrum signal corresponding to the signal number to the receiving end through the frequency point;
determining an interfered frequency point in the plurality of frequency points, and deleting the interweaved signals corresponding to the interfered frequency point to obtain an interference-free signal;
and obtaining the sending signal according to the interference-free signal.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 7 to 8 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 7 to 8.
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