CN106301467B - Enhance the disturbance ecology suppressing method of JTIDS waveforms based on rate - Google Patents
Enhance the disturbance ecology suppressing method of JTIDS waveforms based on rate Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
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Abstract
The present invention provides a kind of disturbance ecology suppressing methods enhancing JTIDS waveforms based on rate, auxiliary sequencel is served as using existing header segment data, preamble segment RS decoders are entangled according to itself to be deleted limit of power and provides M correct result, estimate the mean power of signal, and then the signal-to-noise ratio of each pulse of estimated data section, the pulse by signal-to-noise ratio less than threshold value are deleted.The present invention saves resource overhead, and signal-to-noise ratio (SNR) estimation error is small, and precision is high, and complexity is low, can track fast become and interfere, to improve system rejection to disturbance ability.
Description
Technical field
The invention belongs to wireless communication technology field, it is related to communicating a kind of disturbance ecology inhibition side in anti-interference field
Method can be used for fighting partial-band barrage jamming in frequency-hopping system, and then improve system performance.
Background technology
Joint tactical information distribution system (Joint Tactical Information Distribution System,
JTIDS it) because of strong antijamming capability, disposes the features such as flexible coverage area is big and is widely used in situation of battlefield perception, but pass
Defeated rate is relatively low.To improve transmission rate, Wu Zhao etc. is in " the enhanced JTIDS Waveform Designs of rate based on LDPC code " ([J]
Tsinghua University's journal (natural science edition), 2015,55 (5)：A kind of rate enhancing based on LDPC is proposed in 520-525)
JTIDS waveform schemes.But the program still only is apparent not enough using LDPC code to anti-interference.Partial-band barrage jamming is by power collection
In on limited frequency, not only interference effect is good, but also easy to implement, constitutes and seriously threatens to JTIDS signals.
For the disturbance ecology problem in frequency hopping communications, Li Shaosheng is in " the crucial skill in military cognition radio communication system
Art research " (Beijing [D]：Beijing University of Post ＆ Telecommunication, 2011) it is that JTIDS systems devise a kind of interference based on cognitive radio
Recognition methods, it is assumed that interference at least keep a time slot it is constant, and in the protection interval of each time slot channel perception interference
Situation.But one time slot of this method just perceives a disturbed condition, it is difficult to which tracking is fast to become interference；Xue Minghao etc. " is being based on LDPC
The frequency hopping interference free performance of code " ([J] computer applications, 2011,31 (8)：It 2037-2039) proposes a kind of based on LDPC's
Disturbance ecology wipes algorithm, and the signal-to-noise ratio of pulse is estimated using auxiliary sequencel, and the pulse by signal-to-noise ratio less than threshold value is wiped.
But this method needs additional auxiliary sequencel, resource overhead big.Tsinghua University Yu etc. " is enhancing JTIDS waveforms based on rate
Interference Detection and method for deleting " ([J] Tsinghua University journal (natural science edition), 2015,55 (8)：It is proposed in 821-825)
Estimate signal-to-noise ratio based on blind estimating method.This method does not need additional auxiliary sequencel, but evaluated error is larger, and disturbing pulse
Location estimation is inaccurate.
Invention content
For overcome the deficiencies in the prior art, the present invention provides a kind of interference knowledge based on the enhanced JTIDS waveforms of rate
Other suppressing method serves as auxiliary sequencel using existing header segment data, estimates the mean power of signal, and then estimated data
The signal-to-noise ratio of each pulse of section, the pulse by signal-to-noise ratio less than threshold value is deleted, to improve system rejection to disturbance ability.
The technical solution adopted by the present invention to solve the technical problems includes the following steps：
(1) successively by 32 pulse despread result each twos in preamble segment be one group, merge into 16 groups, selected in every group
High one of correlation peak, obtains 16 despread result D1,D2,...D16；Receive corresponding 16 umber of pulses of 16 despread results
According to r1,r2,...r16, each pulse data totally 32 symbols；
(2) by despread result D1,D2,...D16Preamble segment RS decoders are sent into, preamble segment RS decoders are entangled according to itself to be deleted
Limit of power provides the index i of M correct result1,i2,...iM；As 7≤M≤16, (3), otherwise, this method are entered step
It reports an error and terminates；
(3) signal power is calculated, is included the following steps：
3.1) the corresponding pulse data r of preamble segment is read according to the index of correct resultm, wherein m=i1,i2,...,iM；
3.2) by the corresponding known local pseudo-code sequence PN of the index of correct resultmAs auxiliary sequencel, to PNmCCSK is followed
Ring moves to left DmPosition, the DmFor the corresponding numerical value of despread result, MSK modulation is then carried out, is as a result denoted as
3.3) the signal amplitude A of each symbol of m-th of average pulse is calculatedm, obtain each symbol of m-th of average pulse
Signal power Pm=Am 2；
3.4) average signal power of M pulse is calculated
(4) the reception general power of each symbol of j-th of average pulse of data segment is calculatedJ=1,2 ... 405；
(5) signal-to-noise ratio of j-th of pulse of estimated data section
(6) pulse by signal-to-noise ratio less than given threshold is judged to being disturbed, and carries out delete processing.
The enhancing wave setting that the threshold value is 1.1Mb/s for rate is 2dB, for the increasing that rate is 550kb/s
High-amplitude wave shape is set as -1dB.
The beneficial effects of the invention are as follows：
First, since directly signal-to-noise ratio (SNR) estimation can be carried out as auxiliary sequencel using the existing preamble segment of waveform, it is not required to
Additionally to increase auxiliary sequencel, therefore save resource overhead.
Second, since the present invention is that waveform has and known, and quantity for the auxiliary sequencel of signal-to-noise ratio (SNR) estimation
It is more, thus compared with blind estimate, signal-to-noise ratio (SNR) estimation error smaller of the present invention, precision higher.
Third is done since the present invention carries out signal-to-noise ratio (SNR) estimation one by one to each pulse of data segment as unit of pulse
Identification is disturbed, existing interference identification method is overcome and is difficult to track fast the shortcomings that becoming interference.
4th, disturbance ecology and inhibition are carried out since the already present data of waveform sheet are only utilized in the present invention, and judge
The threshold value whether pulse receives interference is fixed, therefore complexity of the present invention is low.
Description of the drawings
Fig. 1 is the specific implementation flow chart of step 3 of the present invention.
Fig. 2 is the fluctuation schematic diagram that signal-to-noise ratio (SNR) estimation value of the present invention surrounds actual value.
When Fig. 3 is that 20% frequency band of rate 1.1Mb/s waveforms is blocked interference, performance curve schematic diagram of the invention.
When Fig. 4 is that 50% frequency band of rate 550k b/s waveforms is blocked interference, performance curve schematic diagram of the invention
When Fig. 5 is that 0% frequency band of rate 1.1Mb/s waveforms is blocked interference, performance curve schematic diagram of the invention.
When Fig. 6 is that 0% frequency band of rate 550k b/s waveforms is blocked interference, performance curve schematic diagram of the invention.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples, and the present invention includes but are not limited to following implementations
Example.
The present invention calculates the signal power of averagely each symbol, then with pulse for singly using preamble segment as auxiliary sequencel
Position calculates data segment and be averaged the reception power of each symbol, then noise power is the difference of reception power and signal power, in turn
Signal-to-noise ratio is estimated, the pulse that signal-to-noise ratio is less than to anti-interference threshold value is judged to being disturbed, and is deleted.Implementation step is such as
Under：
Steps are as follows for the realization of the method for the present invention：
Step 1,32 pulse despread results in preamble segment are merged into 16 despreading knots by selection combining method
Fruit, and by this 16 despread result D1,D2,...D16Corresponding 16 pulse reception informations storage.16 pulse reception information notes
For r1,r2,...r16, each pulse totally 32 symbols.
Step 2, this 16 despread results are sent into preamble segment RS decoders, RS decoders are entangled at it to be deleted in limit of power,
Provide the index i of correct part in this 16 despread results1,i2,...iM, correct result sum is M, by entangling for preamble segment RS codes
Delete 7≤M≤16 known to ability；
Step 3, the signal power of this time slot is calculated.
3.1) the pulse reception information r that preamble segment corresponds to storage is read according to indexm, wherein m=i1,i2,...,iM。
3.2) corresponding known local pseudo-code sequence PN will be indexedm(each pseudo-code is 32 symbols) is as auxiliary sequence
Row, to PNmCCSK ring shift lefts DmPosition carries out MSK modulation, is as a result denoted as laterWherein m=i1,i2,...,iM。
3.3) with PNmAs auxiliary sequencel, the signal amplitude of each symbol of m-th of average pulse is calculated：
Wherein, rm(n) nth symbol of m-th of pulse of preamble segment is indicated,Indicate m-th of pulse pair of preamble segment
The pseudo-code sequence answeredNth symbol, then the signal power of each symbol of m-th of average pulse is：
Pm=Am 2, m=i1, i2..., iM
3.4) average signal power of M pulse is finally calculated
The header segment signal work(for being identical, i.e. enhanced JTIDS due to receiving signal signal power in a time slot
Rate is identical with data segment signal power, therefore preamble segment signal power PsAs data segment signal power.
Step 4, the reception general power of each symbol of j-th of average pulse of data segment is calculated
Wherein yj(n) nth symbol of expression data segment reception j-th of pulse of signal, j=1,2 ... 405；
Step 5, the signal-to-noise ratio of j-th of pulse of estimated data section
Indicate that signal-to-noise ratio is as unit of dB
Step 6, it is contemplated that the evaluated error and system performance of signal-to-noise ratio, rate 1.1Mb/s enhancings waveform threshold value are set as
2dB, rate 550kb/s enhancings waveform threshold value are set as -1dB.Rate 1.1Mb/s enhancing waveform signal-to-noise ratio is less than the pulse of 2dB
It is judged to being disturbed, delete processing；Pulse of the rate 550kb/s enhancing waveform signal-to-noise ratio less than -1dB is judged to being disturbed, and deletes
Except processing.
Beneficial effects of the present invention can be further illustrated by following emulation.
1. simulated conditions
A) jamming pattern is partial-band obstruction interference, and using Gauss white noises as interference signal；B) when there are parts
When frequency band obstruction interference, all symbols can be disturbed obstruction in the jump frequency coding of corresponding frequency band；C) preamble segment RS decoders are defeated
Enter correct symbolic number and be more than or equal to 7, concrete numerical value is 7 to 16 random number；D) sample rate of each symbol is 16.
2. emulation content and result
Method using the present invention under above-mentioned simulated conditions, to data segment true SNR ranges be -20dB~
Signal-to-noise ratio is estimated in 20dB.Fig. 2 gives the fluctuation that signal-to-noise ratio (SNR) estimation average value surrounds actual value.
Figure it is seen that signal-to-noise ratio is in -20dB~20dB, signal-to-noise ratio (SNR) estimation value approaching to reality value.Illustrate the present invention
Signal-noise ratio estimation method it is very superior.
To verify the superiority of disturbance ecology and suppressing method of the present invention, to the tradition again without additional auxiliary sequencel
Method is emulated under above-mentioned simulated conditions, and is compared with the simulation result of this programme.Fig. 3 and Fig. 4 are provided respectively
Rate 1.1Mb/s enhancings 20% frequency range of waveform is blocked interference and rate 550kb/s enhancings waveform 50% frequency range be blocked it is dry
When disturbing, disturbance ecology suppressing method of the present invention, traditional disturbance ecology suppressing method, ideal AF panel BER performance curves,
Middle ideal AF panel refers to like clockwork deleting all disturbing pulses when having interference, does not delete any arteries and veins when noiseless
Punching, best performance.
From Fig. 3 it is observed that under rate 1.1Mb/s enhancing waveforms, disturbance ecology suppressing method of the invention and reason
Think that AF panel BER performance curves essentially coincide, in BER=10-5When, improve 1.5dB than conventional method.It can be seen from Fig. 4
It observes, under rate 550kb/s enhancing waveforms, in BER=10-5When the present invention disturbance ecology suppressing method press down with ideal interference
System difference only has 0.3dB, and 2.2dB is improved than conventional method.Illustrate that the method for the present invention is substantially complete to disturbing pulse location estimation
It is complete accurate.
For analysis disturbance ecology suppressing method of the invention to the influence of system when noiseless, to again without additional
The conventional method of auxiliary sequencel is emulated under above-mentioned simulated conditions, and is compared with the simulation result of this programme.Fig. 5 and
When Fig. 6 is set forth rate 1.1Mb/s and 550kb/s enhancing 0% frequency range of waveform and is blocked interference, disturbance ecology suppression of the present invention
The BER performance curves of method processed, traditional disturbance ecology suppressing method, ideal AF panel.
From Fig. 5 it is observed that under rate 1.1Mb/s enhancing waveforms, disturbance ecology suppressing method of the invention and reason
Think that AF panel BER performance curves essentially coincide, in BER=10-5When, improve 0.5dB than conventional method.It can be seen from Fig. 6
It observes, under rate 550kb/s enhancing waveforms, in BER=10-5When the present invention disturbance ecology suppressing method press down with ideal interference
System difference only has 0.3dB, is compared than conventional method and improves 0.4dB.Illustrate the method for the present invention compared with conventional method without dry
System performance is set to be very significantly improved when disturbing.
Claims (2)
1. a kind of disturbance ecology suppressing method enhancing JTIDS waveforms based on rate, it is characterised in that include the following steps：
(1) by 32 pulse despread result each twos in preamble segment be successively one group, merge into 16 groups, every group select it is related
High one of peak value, obtains 16 despread result D1,D2,...D16；Receive the corresponding 16 pulse data r of 16 despread results1,
r2,...r16, each pulse data totally 32 symbols；
(2) by despread result D1,D2,...D16Preamble segment RS decoders are sent into, preamble segment RS decoders entangle the ability of deleting according to itself
Range provides the index i of M correct result1,i2,...iM；As 7≤M≤16, (3) are entered step, otherwise, this method reports an error
And it terminates；
(3) signal power is calculated, is included the following steps：
3.1) the corresponding pulse data r of preamble segment is read according to the index of correct resultm, wherein m=i1,i2,...,iM；
3.2) by the corresponding known local pseudo-code sequence PN of the index of correct resultmAs auxiliary sequencel, to PNmCCSK cycles are left
Move DmPosition, the DmFor the corresponding numerical value of despread result, MSK modulation is then carried out, is as a result denoted as
3.3) the pulse data r by receivingmAnd modulated signalCalculate the signal width of each symbol of m-th of average pulse
Value Am, obtain the signal power P of each symbol of m-th of average pulsem=Am 2；
3.4) average signal power of M pulse is calculated
(4) the reception general power of each symbol of j-th of average pulse of data segment is calculatedJ=1,2 ... 405；
(5) signal-to-noise ratio of j-th of pulse of estimated data section
(6) pulse by signal-to-noise ratio less than given threshold is judged to being disturbed, and carries out delete processing.
2. the disturbance ecology suppressing method according to claim 1 for enhancing JTIDS waveforms based on rate, it is characterised in that：
The enhancing wave setting that the threshold value is 1.1Mb/s for rate is 2dB, is set for the enhancing waveform that rate is 550kb/s
It is set to -1dB.
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