CN109818718A - Joint interlacing system for data link communications system - Google Patents
Joint interlacing system for data link communications system Download PDFInfo
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Abstract
The present invention provides a kind of joint interlacing systems for data link communications system, including interleave parameter control module, transmission signal processing module and reception signal processing module；Interleave parameter control module includes sending intertexture control unit and reception intertexture control unit；It sends signal processing module and is located at transmitting terminal, including source coding unit, information source interleave unit, direct expansion unit, channel encoding unit, channel interleaving unit and modulation frequency hopping unit, sends interleave parameter control unit and be respectively electrically connected to information source interleave unit and channel interleaving unit；It receives signal processing module and is located at receiving end, unit, despread unit, channel decoding unit, channel deinterleaving unit and solution are deinterleaved including source coding unit, information source and jumps demodulating unit, and reception interleave parameter control unit is respectively electrically connected to information source and deinterleaves unit and channel deinterleaving unit.
Description
Technical field
The present invention relates to fields of communication technology, interweave in particular to a kind of joint for data link communications system
System.
Background technique
Modern war is the Information System confrontation under information high polymeric and strong electronic countermeasure.It needs in information network
Under support, by the close hinge such as belligerent each weapon platform, weapons and ammunitions at a combat system, war is quickly and accurately realized
Field information, scouting, monitoring, command and control, precision strike are integrated with recruitment evaluation.Data-link can be military by multiple and different types
Sensor, guidance unit of device platform etc. link together, and comprehensive coordination uses multi-platform fire control system, and it is flat to solve multiple weapons
The problems such as target information of platform, firepower resource-sharing.
Due to the abominable of working environment, data link communications system receiving is more from extraneous interference, in particular for property
Interference, challenge for the steady operation of data link communications system, therefore, how to improve the anti-dry of data link communications system
Ability is disturbed as technical problem urgently to be resolved.
Summary of the invention
The present invention is based at least one above-mentioned technical problem, proposes a kind of new for data link communications system
Joint interlacing system can effectively improve system rejection to disturbance ability, it is ensured that the stability of system communication.
In view of this, the invention proposes a kind of new joint interlacing systems for data link communications system, comprising: hand over
Parameter control module is knitted, signal processing module is sent and receives signal processing module；Wherein, the interleave parameter control module packet
It includes and sends intertexture control unit and reception intertexture control unit；The transmission signal processing module is located at transmitting terminal, including letter
Source encoding unit, information source interleave unit, direct expansion unit, channel encoding unit, channel interleaving unit and modulation frequency hopping unit, institute
State source coding unit be electrically connected to the information source interleave unit be connected, the information source interleave unit is electrically connected to the direct expansion list
Member, the direct expansion unit are electrically connected to the channel encoding unit, and the channel encoding unit is electrically connected to the channel interleaving
Unit, the channel interleaving unit are electrically connected to the modulation frequency hopping unit, and the transmission interleave parameter control unit is electric respectively
It is connected to the information source interleave unit and the channel interleaving unit；The reception signal processing module is located at receiving end, including
Source coding unit, information source deinterleave unit, despread unit, channel decoding unit, channel and deinterleave unit and solution jump demodulation
Unit, wherein the source coding unit is electrically connected the information source and deinterleaves unit, and the information source deinterleaves unit and is electrically connected to
The despread unit, the despread unit are electrically connected to the channel decoding unit, and the channel decoding unit is electrically connected to institute
It states channel deinterleaving unit to be connected, the channel deinterleaves unit and is electrically connected to the solution jump demodulating unit, and the reception interweaves
Parameter control unit is respectively electrically connected to the information source and deinterleaves unit and channel deinterleaving unit.
In the above-mentioned technical solutions, it is preferable that the source coding unit is to data to be sent in data link communications system
Message sink coding is carried out to obtain source symbol, and sends it to the information source interleave unit, the information source interleave unit docking
The source symbol received is interleaved to obtain the symbol after information source interweaves, and is sent to the direct expansion unit, described straight
Expand the symbol after unit interweaves to the information source and carry out Direct Sequence Spread Spectrum operation, and export symbol after direct expansion, the channel is handed over
It knits unit to carry out channel coding to symbol after the direct expansion and export channel symbol, the channel interleaving unit is to the channel
Symbol is interleaved, and exports channel symbol after intertexture, and the modulation frequency hopping unit adjusts channel symbol after the intertexture
System, and modulated data are subjected to frequency hopping processing, symbol after output modulation frequency hopping, and symbol after the modulation frequency hopping is sent out
It send to the receiving end.
In any of the above-described technical solution, it is preferable that the modulation frequency hopping unit will be described based on different Frequency points
Symbol is sent after modulation frequency hopping, reaches the receiving end via wireless channel.
In any of the above-described technical solution, it is preferable that the information source interleave unit and the channel interleaving unit carry out
Used interleaving address is the controllable prime codes family sequence of the parameter for sending the output of interleave parameter control unit when intertexture.
In any of the above-described technical solution, it is preferable that the direct expansion unit is specifically to the symbol after information source intertexture
It carries out mutually completing Direct Sequence Spread Spectrum operation with operation with locally generated pseudo noise code, to obtain symbol after the direct expansion,
In, the pseudo noise code includes Pseudo-Noise code.
In any of the above-described technical solution, it is preferable that the solution jumps demodulating unit correction receiving end clock and transmitting terminal
After clock is consistent, transmitting terminal frequency hopping pattern is obtained, and will be after the transmitting terminal frequency hopping pattern and the modulation frequency hopping received
Symbol is multiplied, then is demodulated, and exports solution and jump demodulated signal, and the channel deinterleaves unit and uses and the channel interleaving list
The identical interleaving address of member jumps demodulated signal to the solution and carries out channel deinterleaving, and exports symbol after channel deinterleaves, channel
Symbol carries out channel decoding process after decoding unit deinterleaves the channel, to obtain symbol after channel decoding, the despreading
Symbol is de-spread after unit decodes the channel, with symbol after de-spread, the information source deinterleave unit using and institute
State the identical interleaving address of information source interleave unit to after the despreading symbol carry out information source deinterleaving, and export information source deinterleave after
Symbol, symbol carries out source coding processing after the source coding unit deinterleaves the information source, to obtain receiving data.
In any of the above-described technical solution, it is preferable that the despread unit is specifically used for obtaining the direct expansion unit expansion
Used pseudo noise code when frequency, and the obtained pseudo noise code is multiplied with symbol after channel decoding, it obtains described
Symbol after despreading.
By above technical scheme, system rejection to disturbance ability can be effectively improved, it is ensured that the stability of system communication.
Detailed description of the invention
Fig. 1 shows the schematic block of the joint interlacing system for data link communications system of embodiment according to the present invention
Figure；
Fig. 2 shows the flow diagrams that Fig. 1 combines deinterleaving method used by interlacing system；
Fig. 3 shows the simulation result of the data link communications system rejecting single-tone jamming performance of embodiment according to the present invention.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Below in conjunction with Fig. 1 to Fig. 3, technical scheme is described further:
Fig. 1 shows the schematic block diagram of the joint interlacing system for data link communications system of embodiment according to the present invention.
As shown in Figure 1, the joint interlacing system for data link communications system of embodiment according to the present invention includes: to hand over
Parameter control module is knitted, signal processing module is sent and receives signal processing module.
Wherein, interleave parameter control module includes sending intertexture control unit and receiving intertexture control unit, is used for root
According to the prime codes family sequence of different signal-to-noise ratio demand output different parameters, as the address of transmitting terminal information source and channel interleaving,
The address deinterleaved simultaneously as receiving end information source and channel；
It sends signal processing module and is located at transmitting terminal, compiled including the information source for being performed the encoding operation to source symbol at transmitting terminal
Code unit, the prime codes family sequence for being exported based on interleave parameter control module carry out information source portion to source symbol as address
Point intertexture information source interleave unit, for according to pseudo noise code to source symbol carry out Direct Sequence Spread Spectrum direct expansion unit,
Channel encoding unit for being performed the encoding operation to the channel symbol at transmitting terminal, for defeated based on interleave parameter control module
Prime codes family sequence out as address to channel symbol carry out channel strip intertexture channel interleaving unit and for pair
Transmitting terminal channel symbol is modulated and data after modulation is carried out with the modulation frequency hopping unit of frequency hopping processing；
It receives signal processing module and is located at receiving end, the information source solution including being decoded operation for the source symbol to receiving end
Code unit, the prime codes family sequence for being exported based on interleave parameter control module carry out information source portion to source symbol as address
The information source of the deinterleaving divided deinterleaves unit, for carrying out de-spreading operation to base band data is received according to transmitting terminal pseudo noise code,
With restore the despread unit of data symbol, the channel decoding unit for being decoded operation to the channel symbol at receiving end,
Prime codes family sequence for being exported based on interleave parameter control module carries out the solution of channel strip as address to channel symbol
The channel of intertexture deinterleaves unit and carries out solution jump and demodulation for receiving data to receiving end to obtain the solution of base band data
Jump demodulating unit.
Connection relationship between above-mentioned each unit is as shown in Figure 1, wherein the transmission in interleave parameter control module interweaves
Control unit is connected with information source interleave unit and channel interleaving unit respectively, knits the reception interleave parameter in parameter control module
Control unit deinterleaves unit with information source respectively and channel deinterleaves unit and is connected, processing and list of each unit to data
Interaction between member is specific as follows:
Step 1: the data progress message sink coding that source coding unit is to be sent to data link communications system, exports source symbol；
Wherein, source coding unit is located in the transmission signal processing module of transmitting terminal；
It is interleaved Step 2: sending the source symbol after the message sink coding of step 1 output to information source interleave unit, obtains letter
Symbol after the intertexture of source；
Wherein, information source interleave unit use send the controllable prime codes family sequence of parameter of interleave parameter control unit output as
Interleaving address is interleaved source symbol；
Step 3: the symbol after direct expansion unit interweaves the information source exported through step 2 carries out phase with locally generated pseudo noise code
Direct Sequence Spread Spectrum operation is completed with operation, exports symbol after direct expansion；
Wherein, pseudo noise code, i.e. Pseudo-Noise code, abbreviation PN code；
Step 4: channel encoding unit carries out channel coding to symbol after the direct expansion after the operation of step 3 Direct Sequence Spread Spectrum, it is defeated
Channel symbol out；
Step 5: the channel symbol after step 4 channel coding is interleaved by channel interleaving unit, channel code after output interweaves
Member；
Wherein, the interleaving address used that interweaves is the controllable prime codes race sequence of the parameter of transmission interleave parameter control unit output
Column；
Step 6: modulation frequency hopping unit to after the intertexture that step 5 exports channel symbol be modulated, then by modulated number
According to frequency hopping processing is carried out, symbol after output modulation frequency hopping is then sent through on different Frequency points and sends, reaches through wireless channel
Receiving end；
Step 7: receiving end solution jump demodulating unit is consistent with transmitting terminal clock by correction local clock realization, that is, realize synchronization
Afterwards, transmitting terminal frequency hopping pattern is obtained, then the signal for the arrival receiving end that obtained transmitting terminal frequency hopping pattern and step 6 are exported
It is multiplied, completes to jump received Frequency Hopping Signal solution, then demodulated, output solution jumps demodulated signal；
Step 8: the reception interleave parameter control unit of receiving end exports prime codes family sequence identical with step 5 to step 7
Signal carries out channel deinterleaving after the demodulation of output, and output channel deinterleaves symbol；
Step 9: the resulting channel de-interleaved signal of step 8 is carried out channel decoding process by channel decoding unit, channel is obtained
Symbol after decoding；
Step 10: receiving end is after realization synchronizes, obtain the PN code that transmitting terminal Direct Sequence Spread Spectrum uses, by obtained PN code and
The decoded channel symbol of channel is multiplied in step 9, symbol after being de-spread, and completes to de-spread received signal；
Step 11: two identical prime sequence codes of the step of receiving end reception interleave parameter control unit exports are defeated to step 10
Symbol carries out information source deinterleaving, symbol after output information source deinterleaves after despreading out；
Step 12: symbol carries out source coding processing after the resulting information source of step 10 is deinterleaved, obtain receiving data.
In the above process, the principle for being related to deinterleaving method is specific as shown in Fig. 2, information sequence is first transformed to dimension conjunction
The matrix of suitable m × n then generates the prime codes matrix being adapted to therewith, according to this according to signal sequence institute transformation matrix size
Prime codes matrix is interleaved signal matrix.Interleaving process may be selected corresponding by row or correspond to by column, be interweaved using prime codes
Signal matrix afterwards is issued after being transformed to signal sequence by transmitting terminal, and receiving end is after receiving signal sequence first by signal sequence
It is transformed to the m * n matrix with transmitting terminal identical dimensional, then with the prime codes matrix with transmitting terminal stringent synchronization to this signal square
Battle array is deinterleaved, and the signal matrix after deinterleaving can be carried out follow-up signal processing after being transformed to signal sequence.
With the data link communications system of single tone jamming, (for the system centre frequency for 400MHz, single tone jamming is frequently in detail below
Rate offset be 1MHz, interference signal jamming-to-signal ratio be 30, noise is white Gaussian noise) for it is further to technical solution of the present invention
Illustrate:
Step 1: the source symbol after data link communications system message sink coding is used random sequence, 1000 points, symbol are sent altogether
Number rate 2.5kbps；
Step 2: sending the prime codes matrix interleaver to parameter P=37 to carry out information source intertexture source symbol；
The specific implementation rule of prime sequence codes is as follows:
Prime codes are finite field gf (P2) upper mold P multiplication as a result, it is k (m, l)=ml (modP) that it, which generates expression formula, and 0 <
M, l < P, wherein P is prime number, and k indicates that ordinate label, m indicate code word serial number, and l indicates abscissa label.
Deinterleaving method interleaving address sequence uses nonzero value and non-natural collating sequence in the matrix of prime codes, as friendship
Address sequence in organization method.The value of prime P is determined according to every group information symbol numbers in interleaving process, as long as guaranteeing prime number
The element of code matrix is greater than the number of information symbol.When interweave last column for proceeding to prime codes matrix when often information
The inadequate column of the number of symbol, as long as successively choosing the element group no more than remaining information symbol number in corresponding column at this time
At address sequence.And ranks intertexture will form complete matrix according to the number of the information symbol to interweave every time, because of this journey
It to be determined by accurately calculating with the value of column.
Step 3: by above-mentioned information source interweave after signal carry out Direct Sequence Spread Spectrum, spread spectrum use length for 1024 PN
Code.Channel coding is carried out to the signal after spread spectrum, coding uses code rate for 1/2 convolutional code, and re-encoded symbol rate is
5.12Mbps.The prime codes matrix interleaver to parameter P=47 is sent to carry out channel interleaving, element the channel symbol after channel coding
It is consistent in digital matric generating method and step 2；
Step 4: the signal after above-mentioned information source is interweaved carries out BPSK modulation and frequency hopping, data are sent on different Frequency points
It sends.Design parameter and operation are as follows: the base-band spread-spectrum signal after intertexture carries out dipole inversion, send to interpolation filter and carries out base band
Interpolation and intermediate frequency interpolation, intermediate frequency nominal frequency are 400MHz.BPSK modulation then is carried out using frequency-hopping carrier, and with frequency hopping
Mode sends signal.Frequency hopping rate is 20000hop/s, totally 80 frequency point random selections, and frequency hopping bandwidth is 200MHz,
Frequency point starts for 350MHz, and 2.5MHz is interval, until 450MHz.If signal sampling rate is 1024MHz, baseband data samples
Rate is 25.6MHz；
Step 4: the frequency hopping pattern and direct sequence for having obtained transmitting terminal expand after the receiving end of data link communications system synchronizes
PN code used in frequency；After the signal containing interference and noise for receiving transmitting terminal sending, Frequency Hopping Signal solution is jumped and is demodulated；
Step 5: the signal jumped using prime codes matrix identical with originator parameter P=47 to solution after signal carries out the friendship of channel solution
It knits；
Step 6: carrying out despreading and channel decoding process to the signal after deinterleaving, reuse identical as originator parameter P=37
Prime codes matrix to solution jump signal after signal carry out information source deinterleaving, obtain information source transmission symbol.
The simulation result of data link communications system rejecting single-tone jamming performance is as shown in figure 3, plus single tone jamming in the present embodiment
Jamming-to-signal ratio be JSR=30, frequency deviation fp is 1MHz, and Eb/No variation range is 15 to arrive 20dB, in table bit error rate numerical value be all through
10 times, every time 106 data volumes are crossed emulate and averagely obtain.From figure 3, it can be seen that in Eb/No from 15dB to 20dB
When variation, bit error rate value highest when using no deinterleaving method, performance is worst, and it is most unknown with signal-to-noise ratio to increase downward trend
It is aobvious；The bit error rate that ranks interweave is close with no intertexture bit error rate, and performance is slightly good, but bit error rate is reduced relatively limited；
The performance of BER that prime codes and Quadratic Prime Codes interweave is better than ranks intertexture, and two groups of data have overlapping, both shows property
It can be quite；Pseudo random interleaving performance is best, but increases with signal-to-noise ratio, and prime codes and Quadratic Prime Codes felt properties gradually approach puppet
Random interleaving.As can be seen from Figure 3 the deinterleaving method that the present embodiment proposes has preferable inhibitory effect to single tone jamming, presses down
The performance of system interference is better than common ranks deinterleaving method, and ranks intertexture is especially better than in amount of storage, is handed over pseudorandom
It knits and compares, certain advantage is also occupied on interleaving delay and amount of storage.
Compared with prior art, the application has the advantages that
1. generating interleaving address sequence using prime codes race to realize the intertexture in data link communications system, realizes flexibly, do not have to
Deliberately consider the Dimension Characteristics of matrix；
2. information source and channel strip interleave parameter can jointly control, extensive using adaptability, requirement of being close to the users；
3. the higher and big amount of storage situation of the delay for improving interleaving technology in existing frequency hopping communications, can relax system complex
Degree demand simultaneously simplifies equipment；
4. slightly increase complexity compared with the unused communication system for interweaving and deinterleaving, however it can improve and connects
Error-resilient performance beyond Error Correction of Coding error correcting capability when string mistake, and the probability that signal cracks is reduced, improve signal transmission
Ability of anti-interception and information hiding；
5. especially there is preferable inhibitory effect to single tone jamming and narrowband interference.
The technical scheme of the present invention has been explained in detail above with reference to the attached drawings, and technical solution of the present invention proposes a kind of new
For the joint interlacing system of data link communications system, system rejection to disturbance ability can be effectively improved, it is ensured that system communication it is steady
It is qualitative.
It is merely a preferred embodiment of the present invention, is not intended to restrict the invention, for the technology of this field described in upper
For personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of joint interlacing system for data link communications system characterized by comprising
Interleave parameter control module sends signal processing module and receives signal processing module；
Wherein, the interleave parameter control module includes sending intertexture control unit and reception intertexture control unit；
The transmission signal processing module is located at transmitting terminal, including source coding unit, information source interleave unit, direct expansion unit, letter
Road coding unit, channel interleaving unit and modulation frequency hopping unit, the source coding unit are electrically connected to the information source and interweave
Unit is connected, and the information source interleave unit is electrically connected to the direct expansion unit, and the direct expansion unit is electrically connected to the channel and compiles
Code unit, the channel encoding unit are electrically connected to the channel interleaving unit, and the channel interleaving unit is electrically connected to described
Frequency hopping unit is modulated, the transmission interleave parameter control unit is respectively electrically connected to the information source interleave unit and the channel is handed over
Knit unit；
The reception signal processing module is located at receiving end, including source coding unit, information source deinterleave unit, despread unit,
Channel decoding unit, channel deinterleave unit and solution jumps demodulating unit, wherein the source coding unit is electrically connected the letter
Source deinterleaves unit, and the information source deinterleaves unit and is electrically connected to the despread unit, and the despread unit is electrically connected to described
Channel decoding unit, the channel decoding unit are electrically connected to the channel deinterleaving unit and are connected, and the channel deinterleaves single
Member is electrically connected to the solution and jumps demodulating unit, and the reception interleave parameter control unit is respectively electrically connected to the information source and deinterleaves
Unit and the channel deinterleave unit.
2. the joint interlacing system according to claim 1 for data link communications system, which is characterized in that the information source
Coding unit carries out message sink coding to data to be sent in data link communications system to obtain source symbol, and sends it to institute
Information source interleave unit is stated, after the information source interleave unit is interleaved the source symbol received to obtain information source intertexture
Symbol, and be sent to the direct expansion unit, the symbol after the direct expansion unit interweaves to the information source carries out direct sequence expansion
Frequency operates, and exports symbol after direct expansion, and the channel interleaving unit carries out channel coding to symbol after the direct expansion and exports letter
Road symbol, the channel interleaving unit are interleaved the channel symbol, and export channel symbol after intertexture, and the modulation is jumped
Frequency unit is modulated channel symbol after the intertexture, and modulated data are carried out frequency hopping processing, and output modulation is jumped
Symbol after frequency, and symbol after the modulation frequency hopping is sent to the receiving end.
3. the joint interlacing system according to claim 2 for data link communications system, which is characterized in that the modulation
Frequency hopping unit is sent symbol after the modulation frequency hopping based on different Frequency points, reaches the reception via wireless channel
End.
4. the joint interlacing system according to claim 2 for data link communications system, which is characterized in that the information source
Interleave unit and the channel interleaving unit when being interleaved used interleaving address be the transmissions interleave parameter control singly
The controllable prime codes family sequence of the parameter of member output.
5. the joint interlacing system according to claim 2 for data link communications system, which is characterized in that the direct expansion
Symbol after unit specifically interweaves to the information source carries out mutually completing direct sequence expansion with operation with locally generated pseudo noise code
Frequency operates, to obtain symbol after the direct expansion, wherein the pseudo noise code includes Pseudo-Noise code.
6. being used for the joint interlacing system of data link communications system according to any one of claim 2 to 5, feature exists
In, the solution jump demodulating unit correction receiving end clock it is consistent with transmitting terminal clock after, acquisition transmitting terminal frequency hopping pattern, and by institute
It states transmitting terminal frequency hopping pattern to be multiplied with symbol after the modulation frequency hopping received, then is demodulated, and export solution and jump demodulation letter
Number, the channel deinterleave unit using interleaving address identical with the channel interleaving unit to solution jump demodulated signal into
Row channel deinterleaves, and exports symbol after channel deinterleaves, and symbol carries out letter after channel decoding unit deinterleaves the channel
Road decoding process, to obtain symbol after channel decoding, symbol is de-spread after the despread unit decodes the channel, with
Symbol after to despreading, the information source deinterleave unit using interleaving address identical with the information source interleave unit to the despreading
Symbol carries out information source deinterleaving afterwards, and exports symbol after information source deinterleaves, and the source coding unit deinterleaves the information source
Symbol carries out source coding processing afterwards, to obtain receiving data.
7. the joint interlacing system according to claim 6 for data link communications system, which is characterized in that the despreading
Used pseudo noise code when unit is specifically used for obtaining direct expansion unit spread spectrum, and by the obtained pseudo noise code and institute
Symbol is multiplied after stating channel decoding, obtains symbol after the despreading.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111130594A (en) * | 2019-12-30 | 2020-05-08 | 华南理工大学 | Direct sequence spread spectrum-based heat hidden channel communication method |
| CN111934714A (en) * | 2020-07-21 | 2020-11-13 | 桂林理工大学 | Anti-interference communication method and device |
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| CN102299727A (en) * | 2011-07-31 | 2011-12-28 | 北京理工大学 | Interlacing method used for WLAN frequency hopping system |
| CN109039538A (en) * | 2018-08-01 | 2018-12-18 | 北京理工大学 | A kind of prime codes race joint deinterleaving method for the fast frequency hopping system that is concerned with |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102299727A (en) * | 2011-07-31 | 2011-12-28 | 北京理工大学 | Interlacing method used for WLAN frequency hopping system |
| CN109039538A (en) * | 2018-08-01 | 2018-12-18 | 北京理工大学 | A kind of prime codes race joint deinterleaving method for the fast frequency hopping system that is concerned with |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111130594A (en) * | 2019-12-30 | 2020-05-08 | 华南理工大学 | Direct sequence spread spectrum-based heat hidden channel communication method |
| CN111934714A (en) * | 2020-07-21 | 2020-11-13 | 桂林理工大学 | Anti-interference communication method and device |
| CN111934714B (en) * | 2020-07-21 | 2022-04-12 | 桂林理工大学 | Anti-interference communication method and device |
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Application publication date: 20190528 |