CN115102577B - Single carrier time-frequency domain anti-interference method, system and storage medium - Google Patents
Single carrier time-frequency domain anti-interference method, system and storage medium Download PDFInfo
- Publication number
- CN115102577B CN115102577B CN202210775775.0A CN202210775775A CN115102577B CN 115102577 B CN115102577 B CN 115102577B CN 202210775775 A CN202210775775 A CN 202210775775A CN 115102577 B CN115102577 B CN 115102577B
- Authority
- CN
- China
- Prior art keywords
- signal
- data signal
- interference
- synchronization
- transmitter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
-
- 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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
- H04L7/007—Detection of the synchronisation error by features other than the received signal transition detection of error based on maximum signal power, e.g. peak value, maximizing autocorrelation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
- H04B2001/7152—Interference-related aspects with means for suppressing interference
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The application relates to a single carrier time-frequency domain anti-interference method, a system and a storage medium, which relate to the technical field of single carrier communication and are applied to a receiver of a frequency hopping system, wherein the method comprises the following steps: searching at least one synchronization header transmitted by a transmitter; establishing a synchronization connection with the transmitter based on at least one of the synchronization heads; establishing a communication channel based on the synchronous connection; receiving a first data signal transmitted by the transmitter over the communication channel, the first data signal including signal information; judging whether an interference signal exists in the first data signal or not based on the signal information; and if the interference signal exists in the first data signal, performing anti-interference processing on the first data signal, wherein the anti-interference processing comprises filtering and/or removing the interference signal. The method has the effect of reducing the influence of time-frequency domain interference when the receiver is in communication with the transmitter.
Description
Technical Field
The present disclosure relates to the field of single carrier communication technologies, and in particular, to a single carrier time-frequency domain anti-interference method, system, and storage medium.
Background
At present, a communication system is increasingly complex, and various communication devices are widely applied to various fields of national economy and daily life of people, wherein some communication devices realize data transmission through a single carrier.
In the related art, completing data transmission of a single carrier typically completes wireless communication using a frequency hopping communication system. The frequency hopping communication system is a communication system in which the carrier frequency of a transmission signal changes discretely according to a rule set by both parties of communication, and the carrier frequency used for wireless communication changes rapidly under the control of a set of pseudo-random codes that change at a high speed. When communication is established by using the frequency hopping communication system, if an jammer exists between the receiver and the transmitter, a wideband blocking jammer signal sent by the jammer occupies a channel of the frequency hopping communication system, so that the frequency spectrum in the channel is deteriorated, the communication is established between the receiver and the transmitter is affected, and the information sent by the transmitter cannot be identified by the receiver or is abnormal in identification, so that transmission errors are caused.
Disclosure of Invention
In order to reduce the influence of time-frequency domain interference when a receiver communicates with a transmitter, the application provides a single-carrier time-frequency domain anti-interference method, a system and a storage medium.
In a first aspect, the present application provides a single carrier time-frequency domain anti-interference method, which adopts the following technical scheme:
a single carrier time-frequency domain anti-interference method, applied to a receiver of a frequency hopping system, comprising:
searching at least one synchronization header transmitted by a transmitter;
establishing a synchronization connection with the transmitter based on at least one of the synchronization heads;
establishing a communication channel based on the synchronous connection;
receiving a first data signal transmitted by the transmitter over the communication channel, the first data signal including signal information; judging whether an interference signal exists in the first data signal or not based on the signal information;
and if the interference signal exists in the first data signal, performing anti-interference processing on the first data signal, wherein the anti-interference processing comprises filtering and/or removing the interference signal.
By adopting the technical scheme, the receiver searches the synchronous heads transmitted by the transmitter at different moments, and can resist the time domain interference of the channel in the interference signals, so that the probability of the received synchronous heads is increased, after the synchronous heads are searched, the receiver establishes synchronization with the transmitter, then judges whether the interference signals exist or not, if so, the interference signals are scratched and/or filtered, the stability of the transmission of the first data signals is enhanced, the interference is resisted by the simultaneous entry of the signals and the channel of the communication system, and the influence of the interference signals on the communication can be reduced.
Optionally, when searching for a plurality of synchronization heads transmitted by the transmitter, the establishing a synchronization connection with the transmitter based on at least one synchronization head includes:
calculating a first signal-to-noise ratio of each synchronization head to obtain a plurality of first signal-to-noise ratios;
selecting a first signal-to-noise ratio with the maximum value of the first signal-to-noise ratio from the plurality of first signal-to-noise ratios;
judging whether the selected first signal-to-noise ratio is not smaller than a first preset threshold value or not;
if yes, determining a synchronization head corresponding to the selected first signal-to-noise ratio, and establishing synchronization connection with the transmitter through the synchronization head.
Optionally, the signal information includes power and/or a second signal-to-noise ratio of the first data signal, and the determining whether an interference signal exists in the first data signal based on the signal information includes:
calculating a first power of the first data signal;
judging whether the first power is larger than a second preset threshold value or not;
if the first power is not greater than a second preset threshold value, filtering the first data signal to obtain a second data signal;
calculating a second power of the second data signal;
if the second power is larger than a third preset threshold value, determining that an interference signal exists in the second data signal; and/or the number of the groups of groups,
performing equalization processing on the first data signal to obtain a third data signal;
calculating a second signal-to-noise ratio of the third data signal;
judging whether the second signal-to-noise ratio is larger than a third preset threshold value or not;
and if the second signal-to-noise ratio is not greater than the third preset threshold value, judging that the third data signal has an interference signal.
Optionally, the determining whether the first data signal has an interference signal based on the signal information includes:
acquiring the signal length of the first data signal;
segmenting the first data signal based on the signal length and a preset length to obtain a plurality of data blocks;
continuously integrating the power of a plurality of data blocks to obtain a third power;
judging whether the third power is larger than a fourth preset threshold value or not;
and if the third power is larger than a fourth preset threshold value, judging that the interference signal exists in the current data block.
Optionally, after said determining whether the first data signal has an interference signal based on the signal information, the method further comprises:
acquiring a judging result of judging whether the first data signal has an interference signal or not based on the signal information, wherein the judging result comprises the presence of the interference signal and the absence of the interference signal;
acquiring a correlation peak shape of the first data signal based on the judgment result;
determining parameters of a matched filter based on the correlation peak shape;
judging whether the first data signal needs time offset compensation or not based on the parameters of the matched filter;
if the first data signal needs to be subjected to time offset compensation, tracking a time offset value of the first data signal at the last moment;
and maintaining the synchronous connection based on the time offset value.
In a second aspect, the present application provides a single carrier time-frequency domain anti-interference method, which adopts the following technical scheme:
a single carrier time-frequency domain anti-interference method, applied to a transmitter of a frequency hopping system, comprising:
transmitting at least one synchronization head, and establishing synchronization connection with a receiver according to at least one synchronization head;
establishing a communication channel with the receiver based on the synchronous connection;
a first data signal is transmitted to the receiver based on the communication channel.
By adopting the technical scheme, the probability that the receiver searches the synchronization head can be increased by sending at least one synchronization head, so that synchronization with the receiver is established more quickly, and a first data signal is transmitted to the receiver.
Optionally, the sending at least one synchronization header to the receiver includes:
acquiring the hopping speed of the frequency hopping system;
calculating the time t1 of each frequency hopping based on the hopping speed;
determining a period T1 for transmitting the synchronous head based on the time T1 of each frequency hopping and a preset interference time T2;
calculating the number of the synchronous heads based on the period T1 of the synchronous heads and the time T1 of each frequency hopping;
and determining the frequency point of the transmitter for transmitting the synchronization head based on the number of the synchronization heads.
Optionally, the determining, based on the number of the synchronization heads, a frequency point of the transmitter for sending the synchronization heads includes:
acquiring a frequency domain transmitted by the transmitter;
the synchronous heads are discretely distributed in the frequency domain;
and determining the frequency point for transmitting the synchronous head according to the discrete distribution.
In a third aspect, the present application provides a frequency hopping communication system, which adopts the following technical scheme:
a frequency hopping communication system includes a receiver and a transmitter;
the receiver comprises a signal processing unit, a first phase-locked loop, a second phase-locked loop, an analog switch, a PN code generator and a controller, wherein a 1 pin of the analog switch is electrically connected with the signal processing unit, a 2 pin of the analog switch is electrically connected with the output end of the first phase-locked loop, a 3 pin of the analog switch is electrically connected with the output end of the second phase-locked loop, the input end of the first phase-locked loop and the input end of the second phase-locked loop are both connected with the output end of the PN code generator, the PN code generator and the signal processing unit are both electrically connected with the controller, and a computer program of the method according to the first aspect is stored and processed on the controller;
the transmitter comprises a signal processing unit, a first phase-locked loop, a second phase-locked loop, an analog switch, a PN code generator and a controller, wherein a 1 pin of the analog switch is electrically connected with the signal processing unit, a 2 pin of the analog switch is electrically connected with the output end of the first phase-locked loop, a 3 pin of the analog switch is electrically connected with the output end of the second phase-locked loop, the input end of the first phase-locked loop and the input end of the second phase-locked loop are both connected with the output end of the PN code generator, the PN code generator and the signal processing unit are both electrically connected with the controller, and a computer program of the method according to the second aspect is stored and processed on the controller.
In a fourth aspect, the present application provides a computer readable storage medium, which adopts the following technical scheme:
a computer readable storage medium storing a computer program capable of being loaded by a processor and executing the method according to the first and second aspects.
Drawings
Fig. 1 is a flow chart of a single carrier time-frequency domain anti-interference method applied to a transmitter of a frequency hopping system according to an embodiment of the present application.
Fig. 2 is a flow chart of a single carrier time-frequency domain anti-interference method applied to a receiver of a frequency hopping system according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a single carrier time-frequency domain interference suppression device 300 applied to a receiver of a frequency hopping system according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a single-carrier time-frequency domain interference suppression device 400 applied to a transmitter of a frequency hopping system according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a receiver according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a transmitter according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of a frequency hopping system according to an embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
The embodiment of the application provides a single carrier time-frequency domain anti-interference method, which can be executed by a receiver, wherein the receiver can be a server or terminal equipment, the server can be an independent physical server, a server cluster or a distributed system formed by a plurality of physical servers, and a cloud server for providing cloud computing service. The terminal device may be, but is not limited to, a smart phone, a tablet computer, a desktop computer, etc.
As shown in fig. 1, a single carrier time-frequency domain anti-interference method is applied to a transmitter of a frequency hopping system, and the main flow of the method is described as follows (step S101 to step S103):
step S101, at least one synchronization head is sent to a receiver, and synchronization connection is established according to at least one synchronization head.
In this embodiment, the synchronization header includes four sets of PN codes, where the four sets of PN codes are generated by a PN code generator, and the transmitter generates a hopping pattern according to the PN codes, and the transmitter transmits the synchronization header according to a rule of the hopping pattern.
Specifically, the PN code generator generates a random code according to the m sequence, and can also generate the random code by using a gold sequence.
As an alternative implementation of this embodiment, transmitting at least one synchronization header to the receiver includes:
acquiring the jump speed of a frequency hopping system;
calculating time t1 of each frequency hopping based on the hopping speed;
determining a period T1 for transmitting the synchronous head based on the time T1 of each frequency hopping and the preset interference time T2;
calculating the number of the synchronous heads based on the period T1 of transmitting the synchronous heads and the time T1 of each frequency hopping;
and determining the frequency point of the transmitter for transmitting the synchronous heads based on the number of the synchronous heads.
Specifically, taking the preset interference time T2 as an example, the hop speed of the frequency hopping system is 10000 hops/s, the time T1 of each hop can be calculated to be 0.1ms according to the hop speed of the frequency hopping system, and one synchronization head is set to be sent every four hops, so that the time interval of every two synchronization heads is 0.4ms, if at least one synchronization head is required to be ensured to be out of the preset interference time, the period T1 of sending the synchronization heads is 1.6ms at the minimum, at the moment, the number of sending the synchronization heads can be calculated to be 4 according to the period T1 of sending the synchronization heads, namely the moment of sending the first synchronization head is the starting moment, and the moment of sending the fourth synchronization head is the ending moment. The synchronous heads are sent according to the period, so that at least one synchronous head sent at a certain moment can be searched by the receiver, the probability of synchronous connection between the receiver and the transmitter is increased, and the interference of broadband interference on the established signal is further reduced.
Further, determining the frequency point of the transmitter for transmitting the synchronization header based on the number of the synchronization header includes:
acquiring a frequency domain transmitted by a transmitter;
the synchronous heads are discretely distributed in a frequency domain;
and determining the frequency points of the transmitting synchronous heads according to the discrete distribution.
In this embodiment, the frequency domains transmitted by each transmitter are different, the frequency domain of the signal transmitted by the transmitter is obtained, and the synchronization heads are discretely distributed in the frequency domain of the signal transmitted by the transmitter, so that the frequency points with the synchronization head information are dispersed in the frequency domain of the signal transmitted by the transmitter; wherein the discrete distribution may be a degenerate distribution, a binomial distribution, a poisson distribution or a geometric distribution.
For example, the frequency domain of the transmitter is 50 MHZ-200 MHZ, the frequency domain of the broadband interference is 100 MHZ-170 MHZ, at this time, the frequency points of the transmitting synchronization heads are determined to be 70MHZ, 120MHZ, 140MHZ and 180MHZ according to the discrete distribution, then the frequency points are interfered by the synchronization heads of 120MHZ and 140MHZ, but the frequency points of 70MHZ and 180MHZ are not interfered by the frequency domain of the interference signal, at this time, the receiver and the transmitter can establish the synchronous connection according to the frequency points of 70MHZ or 180 MHZ.
Step S102, a communication channel is established with the receiver based on the synchronous connection.
When the synchronization head transmitted by the transmitter is searched by the receiver, the transmitter establishes frame synchronization and carrier synchronization with the receiver according to the data in the synchronization head, and after the initial synchronization, frame synchronization and carrier synchronization are established between the transmitter and the receiver, the transmitter and the receiver are indicated to keep consistent in time domain and frequency domain, and at this time, the receiver and the transmitter establish a communication channel.
Step S103, transmitting a first data signal to the receiver based on the communication channel.
Specifically, after the transmitter establishes a communication channel with the receiver, it indicates that the frequency hopping system has been established, at which time the transmitter continuously communicates with the receiver and the transmitter continuously transmits the first data signal to the receiver.
As shown in fig. 2, a single carrier time-frequency domain anti-interference method is applied to a transmitter of a frequency hopping system, and the main flow of the method is described as follows (step S201 to step S206):
step S201, searches for at least one synchronization header transmitted by the transmitter.
In this embodiment, the receiver and the transmitter have the same frequency hopping and frequency hopping patterns, the receiver can know the frequency point of the synchronization head transmitted by the transmitter at the current moment, and the receiver searches for the synchronization head by going to a specific frequency point, which can be according to the frequency point.
Step S202, a synchronization connection is established with the transmitter based on the at least one synchronization header.
Specifically, when the receiver searches only one synchronization head, the receiver establishes synchronization connection with the transmitter according to the received synchronization head;
further, when the receiver searches for a plurality of synchronization heads transmitted by the transmitter, establishing a synchronization connection with the transmitter based on the at least one synchronization head includes:
calculating a first signal-to-noise ratio of each synchronization head to obtain a plurality of first signal-to-noise ratios; selecting a first signal-to-noise ratio with the maximum value of the first signal-to-noise ratio from the plurality of first signal-to-noise ratios; judging whether the selected first signal-to-noise ratio is not smaller than a first preset threshold value or not; if yes, determining a synchronization head corresponding to the selected first signal-to-noise ratio, and establishing synchronization connection with the transmitter through the synchronization head.
Specifically, when the receiver receives three synchronization heads, the signal-to-noise ratio of the first synchronization head is-5 dB, the signal-to-noise ratio of the second synchronization head is 20dB, the signal-to-noise ratio of the third synchronization head is 40dB, the first preset threshold value is 0dB, at this time, because the signal-to-noise ratio of the first synchronization head is lower than the first preset threshold value, and the signal-to-noise ratio of the third synchronization head is the largest among the three synchronization heads, the receiver establishes synchronous connection with the transmitter according to the third synchronization head, and although the signal-to-noise ratio of the second synchronization head is greater than the first preset threshold value, the signal-to-noise ratio of the third synchronization head is greater than the signal-to-noise ratio of the second synchronization head, which means that the interference suffered by the third synchronization head is smaller than the interference suffered by the second synchronization head, and the synchronous connection established according to the third synchronization head is more firm. It should be noted that the above data are merely illustrative and are easy to understand.
Step S203, establishing a communication channel based on the synchronous connection.
When the synchronous connection is established according to the synchronous head with the maximum signal-to-noise ratio, the receiver performs the de-hopping of the data of the synchronous head, so that the receiver and the transmitter establish the frame synchronization and the carrier synchronization, thereby ensuring that the frequency hopping of the receiver and the frequency hopping of the transmitter keep synchronous in the time domain and the frequency domain.
In step S204, a first data signal transmitted by the transmitter is received over the communication channel, the first data signal including signal information.
In this embodiment, the signal information includes the power of the first data signal and/or the second signal to noise ratio, and although the receiver and the transmitter have established a synchronous connection, the possibility of the channel being interfered is reduced, the wideband interference signal may interfere with the first data signal when the first data signal is transmitted, so that the interference signal exists in the first data signal, so that after the first data signal transmitted by the transmitter is received, interference detection is performed on the first data signal, and the possibility of the first data signal being interfered is reduced.
Step S205, judge whether there is interference signal in the first data signal on the basis of the signal information, if there is interference signal in the first data signal, go to S206, if there is no interference signal in the first data signal, finish the communication.
In this embodiment, the signal information comprises the power of the first data signal and/or the second signal to noise ratio.
Further, determining whether an interfering signal is present in the first data signal based on the signal information includes:
calculating a first power of the first data signal; judging whether the first power is larger than a second preset threshold value or not; if the first power is not greater than a second preset threshold value, filtering the first data signal to obtain a second data signal; calculating a second power of the second data signal; if the second power is larger than a third preset threshold value, determining that an interference signal exists in the second data signal; and/or performing equalization processing on the first data signal to obtain a third data signal; calculating a second signal-to-noise ratio of the third data signal; judging whether the second signal-to-noise ratio is larger than a third preset threshold value or not; and if the second signal-to-noise ratio is not greater than the third preset threshold value, judging that the third data signal has an interference signal.
In this embodiment, in the frequency hopping system, the duration of the present hop is very short, so the power condition of the whole hop can be described by using the hop power, and the power calculation formula is applied to calculate the first power of the first data signal, where the power calculation formula is as follows:
wherein E is the power of the first data signal, S (t) is the instantaneous amplitude value, S 2 And (t) is an instantaneous power value.
In this embodiment, when the first power is not greater than the second preset threshold value, filtering the first data signal by using a baseband filter to obtain a second data signal, and at this time, if the signal of the second data signal, which is close to the lace, may remain an interference signal, further performing interference detection on the in-band signal, that is, calculating the second power of the second data signal, and comparing the second power with a third preset threshold value, and when the second power is greater than the third preset threshold value, determining that the interference signal exists in the second data signal; when the second power is not greater than the third preset threshold value, it is determined that no interference signal exists in the second data signal, the second data signal is not subjected to the interference signal, and the second data signal can be directly debounced.
As another optional implementation manner of this embodiment, the equalization processing is performed on the first data signal, so that the discrete first data signal obtained by the receiver becomes more balanced, so that the signal-to-noise ratio of the first data signal is more convenient to calculate, and further the interference detection side is more accurate.
In this embodiment, the signal to noise ratio is calculated from the following formula:
wherein SNR is signal-to-noise ratio, P signal For signal power, P noise In order for the noise power to be high,
for bit signal to noise ratio, M is the number of bit symbols, F S For sample rate, BW is signal bandwidth.
As another alternative implementation manner of this embodiment, determining whether the interference signal exists in the first data signal based on the signal information further includes:
acquiring a signal length of a first data signal; segmenting a first data signal based on the signal length and a preset length to obtain a plurality of data blocks; continuously integrating the power of the plurality of data blocks to obtain third power; judging whether the third power is larger than a fourth preset threshold value or not; if yes, determining that the interference signal exists in the current data block.
Specifically, in order to resist the time domain interference, it is required to detect whether the communication system receives the interference in real time, at this time, it is required to detect the intra-hop power in real time, for example, to break the length 12288 of each hop in the first data signal into 16 data blocks, where the length of each data block is 768, integrate each data block continuously to obtain a third power, then determine in real time whether the third power is greater than a fourth preset threshold value, and when the third power is greater than the fourth preset threshold value, determine that an interference signal exists in the current data block, mark the current data block, and then perform anti-interference processing on the current data block.
In this embodiment, after a preset period of time passes after communication is established, the transmitter may transmit the synchronization header again, so as to keep the receiver and the transmitter synchronized, but in the preset period of time, the transmitter and the receiver may gradually lose synchronization due to interference of a time domain or a frequency domain, which eventually leads to disconnection of communication between the transmitter and the receiver.
Specifically, after determining whether the first data signal has an interference signal based on the signal information, the method further includes:
acquiring a judging result of judging whether the first data signal has an interference signal or not based on the signal information, wherein the judging result comprises the presence of the interference signal and the absence of the interference signal;
acquiring a correlation peak shape of the first data signal based on the judgment result;
determining parameters of a matched filter based on the correlation peak shape;
judging whether the first data signal needs time offset compensation or not based on parameters of the matched filter;
if the first data signal needs to be subjected to time offset compensation, tracking a time offset value of the first data signal at a moment;
the synchronous connection is maintained based on the time offset value.
Specifically, in the process of judging whether the interference signal exists, the power detection of the first data signal, the power detection of the second data signal and the signal to noise ratio detection of the third data signal are completed, and the shape of the correlation peak can be judged according to the power detection of the first data signal and the power detection of the second data signal;
if the correlation peak is interfered, the last result is used; if the correlation peak is not interfered, but the surrounding noise of the correlation peak is large, denoising the first data signal; if the correlation peak has a good shape, the present correlation peak is used.
The time offset compensation loop can track the time offset of each hop according to the correlation peak used by the matched filter, so that the smaller time offset can be used for replacing the larger time offset, meanwhile, the time offset compensation loop judges whether to track the time offset value according to the signal-to-noise ratio detection of the third data signal, and if the first data signal needs to carry out time offset compensation, the time offset compensation loop tracks the time offset value of the last moment, so that the receiver and the transmitter are synchronously connected.
In step S206, the anti-interference process is performed on the first data signal.
In this embodiment, a low density sparse parity check (LDPC) array is used to encode a channel, and when a first data signal interferes, the signal that is interfered in the first data signal is scratched out, and then the first data signal is restored by using the LDPC array, so as to reduce interference of the interference signal on the first data signal.
Referring to fig. 3, the embodiment of the present application further discloses a single carrier time-frequency domain anti-interference device, which is applied to a receiver of a frequency hopping system, and the single carrier time-frequency domain anti-interference device 300 includes:
a search module 301 for searching at least one synchronization header transmitted by the transmitter;
a first establishing module 302, configured to establish a synchronous connection with the transmitter based on at least one synchronization header;
a second establishing module 303, configured to establish a communication channel based on the synchronous connection;
a receiving module 304, configured to receive, through a communication channel, a first data signal transmitted by a transmitter, where the first data signal includes signal information;
a judging module 305, configured to judge whether an interference signal exists in the first data signal based on the signal information;
the anti-interference module 306 is configured to perform anti-interference processing on the first data signal, where the anti-interference processing includes matting out the interference signal.
In this alternative embodiment, the second establishing module 303 is further specifically configured to, when searching for a plurality of synchronization headers transmitted by the transmitter, establish a synchronization connection with the transmitter based on at least one synchronization header, including: calculating a first signal-to-noise ratio of each synchronization head to obtain a plurality of first signal-to-noise ratios; selecting a first signal-to-noise ratio with the maximum value of the first signal-to-noise ratio from the plurality of first signal-to-noise ratios; judging whether the selected first signal-to-noise ratio is not smaller than a first preset threshold value or not; if yes, determining a synchronization head corresponding to the selected first signal-to-noise ratio, and establishing synchronization connection with the transmitter through the synchronization head.
In this alternative embodiment, the determining module 305 is further specifically configured to determine whether the signal information includes a power of the first data signal and/or a second signal-to-noise ratio, and determining whether the first data signal has an interference signal based on the signal information includes: calculating a first power of the first data signal; judging whether the first power is larger than a second preset threshold value or not; if the first power is not greater than the second preset threshold value, filtering the first data signal to obtain a second data signal; calculating a second power of the second data signal; if the second power is larger than a third preset threshold value, determining that an interference signal exists in the second data signal; and/or performing equalization processing on the first data signal to obtain a third data signal; calculating a second signal-to-noise ratio of the third data signal; judging whether the second signal-to-noise ratio is larger than a third preset threshold value or not; and if the second signal-to-noise ratio is not greater than the third preset threshold value, judging that the third data signal has an interference signal.
In this alternative embodiment, the determining module 305 is further specifically configured to determine whether the first data signal has an interference signal based on the signal information, including: acquiring a signal length of a first data signal; segmenting a first data signal based on the signal length and a preset length to obtain a plurality of data blocks; continuously integrating the power of the plurality of data blocks to obtain third power; judging whether the third power is larger than a fourth preset threshold value or not; and if the third power is larger than the fourth preset threshold value, determining that the interference signal exists in the current data block.
As an optional implementation manner of this embodiment, the single-carrier time-frequency domain anti-interference device 300 is further specifically configured to obtain a determination result that determines whether the first data signal has an interference signal based on the signal information, where the determination result includes that the interference signal has the interference signal and that the interference signal has not; acquiring a correlation peak shape of the first data signal based on the judgment result; determining parameters of a matched filter based on the correlation peak shape; judging whether the first data signal needs time offset compensation or not based on parameters of the matched filter; if the first data signal needs to be subjected to time offset compensation, tracking a time offset value of the first data signal at a moment; the synchronous connection is maintained based on the time offset value.
The functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part. The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored on a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, or in a software product, which is stored in a storage medium and includes several instructions to cause an electronic device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the single carrier time-frequency domain anti-interference method of the embodiments of the present application.
Referring to fig. 4, the embodiment of the present application further discloses a single carrier time-frequency domain anti-interference device, which is applied to a transmitter of a frequency hopping system, and the single carrier time-frequency domain anti-interference device 400 includes:
a transmitting module 401 for transmitting at least one synchronization header, and establishing a synchronization connection with the receiver according to the at least one synchronization header;
a third establishing module 402, configured to establish a communication channel with the receiver based on the synchronous connection;
the transmitting module 403 transmits the first data signal to the receiver based on the communication channel.
In this alternative embodiment, the sending module 401 is further specifically configured to send at least one synchronization header to a receiver, including: acquiring the jump speed of a frequency hopping system; calculating time t1 of each frequency hopping based on the hopping speed; determining a period T1 for transmitting the synchronous head based on the time T1 of each frequency hopping and the preset interference time T2; calculating the number of the synchronous heads based on the period T1 of transmitting the synchronous heads and the time T1 of each frequency hopping; and determining the frequency point of the transmitter for transmitting the synchronous heads based on the number of the synchronous heads.
In this optional embodiment, the sending module 401 is further specifically configured to determine, based on the number of synchronization headers, a frequency point at which the transmitter sends the synchronization header includes: acquiring a frequency domain transmitted by a transmitter; the synchronous heads are discretely distributed in a frequency domain; and determining the frequency points of the transmitting synchronous heads according to the discrete distribution.
The functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part. The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored on a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, or in a software product, which is stored in a storage medium and includes several instructions to cause an electronic device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the single carrier time-frequency domain anti-interference method of the embodiments of the present application.
Referring to fig. 5, an embodiment of the application discloses a receiver, which includes a signal processing unit, a first phase-locked loop, a second phase-locked loop, an analog switch, a PN code generator and a controller, wherein a 1 pin of the analog switch is electrically connected with the signal processing unit, a 2 pin of the analog switch is electrically connected with an output end of the first phase-locked loop, a 3 pin of the analog switch is electrically connected with an output end of the second phase-locked loop, an input end of the first phase-locked loop and an input end of the second phase-locked loop are both connected with an output end of the PN code generator, and the PN code generator and the signal processing unit are both electrically connected with the controller.
Referring to fig. 6, an embodiment of the application discloses a transmitter, including a signal processing unit, a first phase-locked loop, a second phase-locked loop, an analog switch, a PN code generator and a controller, 1 pin of the analog switch is electrically connected with the signal processing unit, 2 pin of the analog switch is electrically connected with the output end of the first phase-locked loop, 3 pin of the analog switch is electrically connected with the output end of the second phase-locked loop, the input end of the first phase-locked loop and the input end of the second phase-locked loop are both connected with the output end of the PN code generator, and the PN code generator and the signal processing unit are both electrically connected with the controller.
Specifically, the signal processing unit is configured to perform signal processing on a signal received by the receiver.
In this embodiment, when a synchronous connection with the transmitter needs to be established, the controller controls the PN code generator to output a random sequence, and then mixes the frequency output by the first phase-locked loop or the second phase-locked loop with the random sequence output by the PN code generator, thereby searching for a signal transmitted by the transmitter.
Meanwhile, in this embodiment, when the jump speed of the receiver needs to be improved, the controller controls the analog switch to be connected with the first phase-locked loop, and simultaneously controls the second phase-locked loop to be started, and when the output frequency of the second phase-locked loop is stable, the controller controls the analog switch to be conducted with the second phase-locked loop, so that the jump speed of the frequency hopping system is improved.
In this embodiment, the receiver and the transmitter have the same first phase-locked loop, second phase-locked loop, analog switch and controller, it is easy to understand that the first phase-locked loop and the second phase-locked loop alternate in ping-pong, so as to increase the jump speed for the receiver; the ping-pong alternation is that when the frequency output by the first phase-locked loop is used, the controller controls the second phase-locked loop to start, when the frequency output by the second phase-locked loop is stable, the controller controls the analog switch to be conducted with the second phase-locked loop, and the second phase-locked loop is used for outputting, so that the second phase-locked loop reciprocates, and the jump speed of the receiver is improved.
Referring to fig. 7, an embodiment of the present application provides a frequency hopping system, including the receiver and the transmitter described above.
The embodiment of the application provides a computer readable storage medium storing a computer program capable of being loaded by a processor and executing the single carrier time-frequency domain anti-interference method provided by the embodiment.
In this embodiment, the computer-readable storage medium may be a tangible device that holds and stores instructions for use by the instruction execution device. The computer readable storage medium may be, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination of the preceding. In particular, the computer readable storage medium may be a portable computer disk, hard disk, USB flash disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), podium random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital Versatile Disk (DVD), memory stick, floppy disk, optical disk, magnetic disk, mechanical coding device, and any combination of the foregoing.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the application referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or their equivalents is possible without departing from the spirit of the application. Such as the above-mentioned features and the technical features having similar functions (but not limited to) applied for in this application are replaced with each other.
Claims (8)
1. A single carrier time-frequency domain anti-interference method, characterized in that it is applied to a receiver of a frequency hopping system, said method comprising:
searching at least one synchronization header transmitted by a transmitter;
establishing a synchronization connection with the transmitter based on at least one of the synchronization heads;
establishing a communication channel based on the synchronous connection;
receiving a first data signal transmitted by the transmitter over the communication channel, the first data signal including signal information;
judging whether an interference signal exists in the first data signal or not based on the signal information;
if an interference signal exists in the first data signal, performing anti-interference processing on the first data signal, wherein the anti-interference processing comprises filtering and/or removing the interference signal;
when a plurality of synchronization heads transmitted by the transmitter are searched, the establishing a synchronization connection with the transmitter based on at least one of the synchronization heads includes:
calculating a first signal-to-noise ratio of each synchronization head to obtain a plurality of first signal-to-noise ratios;
selecting a first signal-to-noise ratio with the maximum value of the first signal-to-noise ratio from the plurality of first signal-to-noise ratios;
judging whether the selected first signal-to-noise ratio is not smaller than a first preset threshold value or not;
if yes, determining a synchronization head corresponding to the selected first signal-to-noise ratio, and establishing synchronization connection with the transmitter through the synchronization head.
2. The method of claim 1, wherein the signal information comprises a power of the first data signal and/or a second signal to noise ratio, and wherein determining whether the first data signal is subject to an interfering signal based on the signal information comprises:
calculating a first power of the first data signal;
judging whether the first power is larger than a second preset threshold value or not;
if the first power is not greater than a second preset threshold value, filtering the first data signal to obtain a second data signal;
calculating a second power of the second data signal;
if the second power is larger than a third preset threshold value, determining that an interference signal exists in the second data signal; and/or the number of the groups of groups,
performing equalization processing on the first data signal to obtain a third data signal;
calculating a second signal-to-noise ratio of the third data signal;
judging whether the second signal-to-noise ratio is larger than a third preset threshold value or not;
and if the second signal-to-noise ratio is not greater than the third preset threshold value, judging that the third data signal has an interference signal.
3. The method according to claim 1 or 2, wherein said determining whether the first data signal has an interfering signal based on the signal information comprises:
acquiring the signal length of the first data signal;
segmenting the first data signal based on the signal length and a preset length to obtain a plurality of data blocks;
continuously integrating the power of a plurality of data blocks to obtain a third power;
judging whether the third power is larger than a fourth preset threshold value or not;
and if the third power is larger than a fourth preset threshold value, judging that the interference signal exists in the current data block.
4. The method of claim 1, wherein after said determining whether said first data signal is an interfering signal based on said signal information, said method further comprises:
acquiring a judging result of judging whether the first data signal has an interference signal or not based on the signal information, wherein the judging result comprises the presence of the interference signal and the absence of the interference signal;
acquiring a correlation peak shape of the first data signal based on the judgment result;
determining parameters of a matched filter based on the correlation peak shape;
judging whether the first data signal needs time offset compensation or not based on the parameters of the matched filter;
if the first data signal needs to be subjected to time offset compensation, tracking a time offset value of the first data signal at the last moment;
and maintaining the synchronous connection based on the time offset value.
5. A single carrier time-frequency domain anti-interference method, characterized in that it is applied to a transmitter of a frequency hopping system, said method comprising:
transmitting at least one synchronization head to a receiver, and establishing synchronization connection with the receiver according to at least one synchronization head;
establishing a communication channel with the receiver based on the synchronous connection;
transmitting a first data signal to the receiver based on the communication channel;
the transmitting at least one synchronization header to the receiver comprises:
acquiring the hopping speed of the frequency hopping system;
calculating time t1 of each frequency hopping based on the hopping speed;
determining a period T1 for transmitting the synchronous head based on the time T1 of each frequency hopping and a preset interference time T2;
calculating the number of the synchronous heads based on the period T1 of the synchronous heads and the time T1 of each frequency hopping;
and determining the frequency point of the transmitter for transmitting the synchronization head based on the number of the synchronization heads.
6. The method of claim 5, wherein the determining the frequency point at which the transmitter transmits the synchronization header based on the number of synchronization headers comprises:
acquiring a frequency domain transmitted by the transmitter;
the synchronous heads are discretely distributed in the frequency domain;
and determining the frequency point for transmitting the synchronous head according to the discrete distribution.
7. A frequency hopping communication system comprising a receiver and a transmitter;
the receiver comprises a signal processing unit, a first phase-locked loop, a second phase-locked loop, an analog switch, a PN code generator and a controller, wherein a 1 pin of the analog switch is electrically connected with the signal processing unit, a 2 pin of the analog switch is electrically connected with an output end of the first phase-locked loop, a 3 pin of the analog switch is electrically connected with an output end of the second phase-locked loop, an input end of the first phase-locked loop and an input end of the second phase-locked loop are both connected with an output end of the PN code generator, the PN code generator and the signal processing unit are both electrically connected with the controller, and a computer program of the method of any one of claims 1 to 4 is stored and processed on the controller;
the transmitter comprises a signal processing unit, a first phase-locked loop, a second phase-locked loop, an analog switch, a PN code generator and a controller, wherein a 1 pin of the analog switch is electrically connected with the signal processing unit, a 2 pin of the analog switch is electrically connected with an output end of the first phase-locked loop, a 3 pin of the analog switch is electrically connected with an output end of the second phase-locked loop, an input end of the first phase-locked loop and an input end of the second phase-locked loop are both connected with an output end of the PN code generator, the PN code generator and the signal processing unit are both electrically connected with the controller, and a computer program of the method as claimed in claim 5 or 6 is stored and processed on the controller.
8. A computer readable storage medium, characterized in that a computer program is stored which can be loaded by a processor and which performs the method according to any of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210775775.0A CN115102577B (en) | 2022-07-01 | 2022-07-01 | Single carrier time-frequency domain anti-interference method, system and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210775775.0A CN115102577B (en) | 2022-07-01 | 2022-07-01 | Single carrier time-frequency domain anti-interference method, system and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115102577A CN115102577A (en) | 2022-09-23 |
| CN115102577B true CN115102577B (en) | 2023-06-16 |
Family
ID=83295390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210775775.0A Active CN115102577B (en) | 2022-07-01 | 2022-07-01 | Single carrier time-frequency domain anti-interference method, system and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115102577B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101442341A (en) * | 2007-11-19 | 2009-05-27 | 电子科技大学 | New method for capturing frequency-hopping signal |
| CN108934020A (en) * | 2018-05-24 | 2018-12-04 | 广州海格通信集团股份有限公司 | Microwave Net channel access method and system based on narrow-band beam directional aerial |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5722059A (en) * | 1995-02-24 | 1998-02-24 | Ntp Incorporated | Radio receiver for use in a radio tracking system and a method of operation thereof |
| US7580444B2 (en) * | 2004-05-04 | 2009-08-25 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Industry, Through The Communications Research Centre Canada | Frequency hopping communication system |
| US8831546B2 (en) * | 2011-11-07 | 2014-09-09 | Ibiquity Digital Corporation | MRC antenna diversity for FM IBOC digital signals |
| US20140073953A1 (en) * | 2012-09-11 | 2014-03-13 | Nellcor Puritan Bennett Llc | Methods and systems for determining physiological information based on the shape of autocorrelation peaks |
| CN104301006B (en) * | 2014-09-26 | 2016-05-04 | 西安空间无线电技术研究所 | A kind of multichannel slow frequency hopping signal anti-interference process system |
| CN111555773B (en) * | 2020-05-26 | 2021-08-31 | 上海无线电设备研究所 | Frequency hopping synchronization method |
| CN114189310B (en) * | 2021-12-07 | 2022-06-21 | 中国人民解放军32802部队 | Unmanned aerial vehicle measurement and control signal accurate interference method based on signal reconnaissance and prediction |
-
2022
- 2022-07-01 CN CN202210775775.0A patent/CN115102577B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101442341A (en) * | 2007-11-19 | 2009-05-27 | 电子科技大学 | New method for capturing frequency-hopping signal |
| CN108934020A (en) * | 2018-05-24 | 2018-12-04 | 广州海格通信集团股份有限公司 | Microwave Net channel access method and system based on narrow-band beam directional aerial |
Non-Patent Citations (1)
| Title |
|---|
| Feilong Li ; Zhiqiang Li ; Dekan Lou ; Yan Jiang.Analysis and research of synchronization technique for frequency-hopping communication systems.《IEEE》.2012,全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115102577A (en) | 2022-09-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Canberk et al. | Primary user activity modeling using first-difference filter clustering and correlation in cognitive radio networks | |
| RU2281609C2 (en) | Method for controlling transmission performance | |
| US8886148B2 (en) | Signal based gain control | |
| US8812063B2 (en) | Signal characteristic-based leading edge detection | |
| KR20040111347A (en) | An adaptive threshold algorithim for real-time wavelet de-nosing applications | |
| CN104821837B (en) | A kind of frequency hopping jamproof system for MF TDMA systems | |
| CN101951274A (en) | Cooperative spectrum sensing method of low complexity | |
| CN113746536B (en) | Scattering communication method, signal transmitting device, signal receiving device and system | |
| KR102390190B1 (en) | Recurrent neural network based spectrum sensing method and device for cognitive radio communications | |
| CN106656372B (en) | Frequency band interference detection method of frequency hopping system | |
| CN102064850A (en) | Data transmission method based on low-voltage power line | |
| CN115102577B (en) | Single carrier time-frequency domain anti-interference method, system and storage medium | |
| CN115051727B (en) | Frequency hopping frequency point adjusting method and device, electronic equipment and storage medium | |
| Chandra et al. | Optimizing information efficiency in a direct-sequence mobile packet radio network | |
| CN113078926B (en) | Data transmission method and device and electronic equipment | |
| Ni et al. | Adaptive cooperative spectrum sensing based on SNR estimation in cognitive radio networks | |
| KR20220038623A (en) | Method and apparatus for detecting | |
| US9338587B2 (en) | System and method for radio-tagging radio transmitters | |
| JP4335913B2 (en) | Method and system for capturing a received impulse radio signal | |
| KR101347885B1 (en) | Apparatus for cognitive radio and method thereof | |
| KR101494966B1 (en) | Method and apparatus for wideband spectrum sensing in cognitive radio | |
| CN109547129B (en) | Stepping weighting Tong detection method | |
| CN106533607B (en) | A kind of tracking interference identification method for narrowband low speed Frequency Hopping Signal | |
| Zhang et al. | Asynchronous cooperative spectrum sensing in cognitive radio | |
| EP1599983A2 (en) | Method, system and apparatus for acquiring a received impulse radio signal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |