CN106160906A - Signal processing method and device - Google Patents
Signal processing method and device Download PDFInfo
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- CN106160906A CN106160906A CN201510142487.1A CN201510142487A CN106160906A CN 106160906 A CN106160906 A CN 106160906A CN 201510142487 A CN201510142487 A CN 201510142487A CN 106160906 A CN106160906 A CN 106160906A
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Abstract
The present invention proposes a kind of signal processing method and device, and this signal processing method includes: the interference type of detection current environment；Select and the corresponding anti-interference processing method of this interference type according to interference type.The present invention is by judging to interference type, result according to judgement, select corresponding synchronization scenario, the inaccurate problem that or cannot synchronize of time synchronized under the conditions of burst interference, single tone jamming and broadband interference can be effectively improved, it is applicable to burst interference, the interference of single-tone band and broadband interference the environment deposited, it is greatly improved the performance of time synchronized, thus promote systematic function.
Description
Technical field
The present invention relates to signal transacting field, it particularly relates to a kind of signal processing method and device.
Background technology
Synchronization is the premise of all communication system proper communications, in order to reach preferable time synchronized performance, and one
As use related method of sliding, calculate receiving sequence and the correlation of the sequence that prestores, then ask the end to make an uproar, it
Ratio and the thresholding made an uproar by correlation and the end afterwards contrast, if greater than thresholding, then it is assumed that detect with
Beans-and bullets shooter, otherwise, then do not have.This method is referred to as the method for synchronizing time of full word length, sees Fig. 1 for associating
Time synchronized module diagram when dependency number is N, in Fig. 1, D is that a burst receives letter current
Number of samples under number sample rate, N is associating relative number, time delay 0=(N-1) D, time delay 1=(N-2) D ...,
Time delay N-1=0.In the local sequence of N group corresponding frame structure respectively, burst #0, burst #1, burst #2 ... dash forward
Send out the local sequence that the Midamble code of #N-1 use is generated.Receipt signal is first local with N group pre-
Deposit sequence and carry out the calculating of correlation, afterwards N group correlation squared results is overlapped, and then handle is folded
Add result send into the end make an uproar calculating and detection judging module, finally obtain time synchronized position.For list shown in figure
The synchronization module of root reception antenna, if many reception antennas, then every antenna is all through the phase shown in figure
Close result computing module, finally the Coherent addition result of many antennas is sent into laminating module together and carry out the end and make an uproar
Calculate and detection judging module.The synchronous method that sign bit quantifies refers to carry out sign bit amount to receiving sequence
Changing, only needing a word length just can represent receiving sequence in the implementation, it is multiple that sign bit computing greatly reduces exploitation
Miscellaneous degree.
The Time Synchronizing that each communication system generally uses is the method for synchronizing time of full word length, i.e. directly counts
Calculate received training sequence and the correlation of the sequence that prestores, then ask the end to make an uproar, the ratio made an uproar by correlation and the end afterwards
Value and thresholding are compared, if greater than thresholding, then it is assumed that detect synchronous point, otherwise, then do not have.
This thresholding is to be obtained by emulation, and relevant with actual environment.
But, actual environment there will be the violent time domain impulse interference of shake, compare at this communication environment
When severe, the Time synchronization algorithm of full word length is due to can be because the violent interference of shake during calculating
Existence so that the related performance number obtaining is relatively big and exceedes thresholding, is mistaken for synchronous point so that erroneous judgement
Probability increases, thus deterioration times net synchronization capability.
Thus, the long-time synchronized algorithm of the full word under adverse circumstances lost efficacy, and failure cause is the work(of receiving sequence
Rate is shaken.
The Time synchronization algorithm that sign bit quantifies is by carrying out sign bit quantization to receiving sequence so that related knot
Fruit is not affected by receiving sequence power jitter, and, only need a word length just can represent reception in the implementation
Sequence, and greatly reduce exploitation complexity.
Emulate correlation comparing result under full word length and two kinds of synchronous method of sign bit for certain data, see figure
2 and Fig. 3.
The time synchronized performance that the method that sign bit quantifies can be effectively improved under adverse circumstances, but compared to
The long method of full word, sign bit quantization method lost more amplitude information in terms of receipt signal.Therefore,
In the case of glitch-free, the performance of the method meeting deterioration times synchronization that sign bit quantifies.That is, full word is long
Time synchronization algorithm be applicable to glitch-free environment, the method that sign bit quantifies is applicable to the ring of shaking interference
Border.When burst interference, single tone jamming and broadband interference are simultaneous, simple full word is rectangular
Method or sign bit quantization method all can deterioration times synchronization performance.
For the problem in correlation technique, effective solution is not yet proposed at present.
Content of the invention
For the problem in correlation technique, the present invention proposes a kind of signal processing method and device, can be suitable for
In multiple interference environments and in the case of deposit, the synchronousness of system can be effectively improved.
The technical scheme is that and be achieved in that:
According to an aspect of the invention, it is provided a kind of signal processing method.
This signal processing method includes:
The interference type of detection current environment；
Select and the corresponding anti-interference processing method of interference type according to interference type.
Wherein, the interference type detecting current environment includes:
Whether detection current environment exists time domain impulse disturbances.
Wherein, according to interference type selection, corresponding anti-interference processing method includes with interference type:
In the case that current environment exists time domain impulse disturbances, the method being quantified by sign bit carries out anti-dry
Disturb process.
Wherein, according to interference type selection, corresponding anti-interference processing method farther includes with interference type:
In the case that current environment does not exist time domain impulse disturbances, carried out anti-dry by the long synchronous method of full word
Disturb process.
Additionally, whether detection current environment exists time domain impulse disturbances and includes:
The data of one slot length are divided into M detection window, M >=0；
Calculate the average power content P of each detection windowm；
Calculate the performance number of the sampled point of each detection window
If current detection windowThen judge that current detection window exists time domain impulse disturbances, wherein a
It is a predetermined threshold；
If data existing the quantity of the detection window of time domain impulse disturbances more than the half of detection window sum, then sentence
Determine current environment and there is time domain impulse disturbances.
According to a further aspect in the invention, additionally providing a kind of signal processing apparatus, this device includes:
Detection module, for detecting the interference type of current environment；
Select module, for selecting and the corresponding anti-interference processing method of interference type according to interference type.
Wherein, detection module is further used for whether detection current environment exists time domain impulse disturbances.
Wherein, module is selected to include:
First process submodule, in the case that current environment exists time domain impulse disturbances, passes through symbol
The method that position quantifies carries out anti-interference process.
Wherein, module is selected to farther include:
Second process submodule, in the case of there is not time domain impulse disturbances in current environment, by entirely
Word length synchronous method carries out anti-interference process.
Additionally, detection module farther includes:
Divide submodule, for the data of a slot length are divided into M detection window, M >=0；
First calculating sub module, for calculating the average power content P of each detection windowm；
Second calculating sub module, for calculating the performance number of the sampled point of each detection window
First determination module, if for current detection windowIn the presence of then judging current detection window
Territory impulse disturbances, wherein a is a predetermined threshold；
Second determination module, if the quantity of the detection window for there is time domain impulse disturbances in data is more than detection
The half of window sum, then judge that current environment exists time domain impulse disturbances.
The present invention, by judging interference type, according to the result of judgement, selects corresponding synchronization scenario,
Can be effectively improved burst interference, time synchronized is inaccurate under the conditions of single tone jamming and broadband interference or nothing
The problem of method synchronization, it is adaptable to burst interference, the interference of single-tone band and broadband interference the environment deposited, greatly
Improve greatly the performance of time synchronized, thus promote systematic function.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example, the accompanying drawing of required use is briefly described, it should be apparent that, the accompanying drawing in describing below is only
Some embodiments of the present invention, for those of ordinary skill in the art, are not paying creative work
Under the premise of, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram combining time synchronized module when dependency number is N in prior art；
Fig. 2 is the emulation schematic diagram of the full word length synchronization correlation of certain data in prior art；
Fig. 3 is the emulation schematic diagram of the sign bit quantization synchronization correlation of certain data in prior art；
Fig. 4 is the schematic flow sheet of the signal processing method of the embodiment of the present invention；
Fig. 5 is the flow chart of signal processing method according to embodiments of the present invention；
Fig. 6 be interpolation impulse disturbances according to embodiments of the present invention after time-domain received signal waveform diagram；
Fig. 7 be according to embodiments of the present invention carry out Interference Detection and carry out anti-interference after time domain receive
Signal waveform schematic diagram；
Fig. 8 is the schematic diagram of burst structure according to embodiments of the present invention；
Fig. 9 is the block diagram of signal processing apparatus according to embodiments of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
It Chu, is fully described by, it is clear that described embodiment is only a part of embodiment of the present invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art obtained all its
His embodiment, broadly falls into the scope of protection of the invention.
Based on produced problem in prior art, inventor have found that two kinds of time synchronized correlation techniques for
Different interference modes has respective advantage: for the impulse disturbances that bursty jitter is violent, sign bit quantization side
The anti-jamming effectiveness of method is relatively good, for the interference of other single-tone, broadbands etc., due to sign bit quantization
Method makes amplitude information lose, and its performance is less than the long synchronous method of full word.Based on above reason, permissible
Propose a solution and i.e. consider first to carry out before the synchronization interference type judgement, be then based on disturbing class
The result of type judgement carries out associative mode selection, after time domain Interference Detection completes, examines according to impulse disturbances
The result surveyed, if be detected that impulse disturbances, uses sign bit quantification method, without detecting that pulse is done
Disturb, use full word regular way, carry out time synchronized afterwards.Its flow process as shown in Figure 4, resists for time synchronized
Data storage section in jamming program Fig. 4, owing to not finding accurately before synchronous point, if pressed
Do Interference Detection according to next burst-length every, it is impossible to comprise all complete same in ensureing the data segment chosen
Step sequence, therefore, the data after finishing Interference Detection every time are put in buffering area storage, enter line slip phase
Guan Shi, synchronous window slip over each Interference Detection successively after data block, window sliding to be synchronized goes out above
During data, this data block can be abandoned in this buffering area.
According to embodiments of the invention, provide a kind of signal processing method.
As it is shown in figure 5, signal processing method according to embodiments of the present invention includes:
Step S501, the interference type of detection current environment；
Step S503, selects and the corresponding anti-interference processing method of interference type according to interference type.
Concrete, can detect whether current environment exists time domain arteries and veins when detecting the interference type of current environment
Punching interference.
If be detected that current environment exists time domain impulse disturbances, then resisted by the method that sign bit quantifies
Interference process.
If be detected that current environment does not exist time domain impulse disturbances, then resisted by the long synchronous method of full word
Interference process.
Wherein, detecting when whether current environment exists time domain impulse disturbances and can realized by detection algorithm,
Specifically comprise the following steps that
A: the data of a slot length are divided into M detection window, M >=0；
B: obtain each window m (m=0,1 ..., M-1) average power content Pm；
C: the performance number of each sampled point in obtaining each window
D: for each window m, contrastWith aPm(wherein coefficient a is obtained by emulation, and threshold value is with allusion quotation
Interference type under type environment such as number, duration, intensity etc. have direct relation, therefore the choosing of thresholding
Also need to combine actual conditions to consider) size；
E: for each window m, if there isThen think and detect that time domain impulse disturbs in this window,
Otherwise, then it is assumed that it is not detected by time domain impulse interference in this window；
F: if be detected that the number of the window of impulse disturbances is more than the half of total window number, then it is assumed that have pulse to do
Disturb existence, otherwise, then without.
Then, subsequent treatment is carried out according to interference judged result, if there is impulse disturbances, then symbolization
The method that position quantifies carries out anti-interference process, exists without impulse disturbances, then use full word length synchronization side
Method carries out anti-interference process.Impulse disturbances detection algorithm effect is shown in Fig. 6 and Fig. 7.For characterizing the effect of algorithm,
Zero setting process is done in impulse disturbances position by Fig. 7.
In addition, to detecting that impulse disturbances position can also have zero setting and two kinds of processing methods of not zero setting in place, originally
Zero-setting operation is not done in invention, in theory for zero setting follow-up related algorithm can be made to lose some amplitude priori letter
Breath, not zero setting has gain relative to zero setting to the present invention also by simulating, verifying.It is understood that this
Bright also can be suitable in due course selection do zero setting or not zero setting process.
Prior art can improve the inaccurate problem of the time synchronized under adverse circumstances, but for noiseless
The time synchronized performance of environment have a certain degree of deterioration, this is because the method that sign bit quantifies is compared
Have lost some amplitude informations in traditional long synchronous method of full word.
Having each different advantages based on different method for synchronizing time to different interference types, the present invention carries
Go out the time synchronized anti-interference method selecting based on associative mode.First whether concrete scheme for depositing in environment
Judge in the violent time domain impulse interference of shake, then according to court verdict, if there is impulse disturbances,
The method for synchronizing time that then symbolization position quantifies, if there is no time domain impulse interference, then uses full word long
Method for synchronizing time.Carry out time synchronized afterwards.
Compared to existing technical scheme, the present invention is applicable to multiple interference type the environment deposited, Ke Yigui
Keep away prior art under noiseless environment, for the deterioration of time synchronized performance, to reach disturbance is not existed together
The effect of reason, it is adaptable to various interference environments.
The time synchronized interference free performance of the Simulation Evaluation present invention, wherein simulated conditions and hypothesis are as follows:
Table 1 simulated conditions and hypothesis
Note: associating dependency number is for participating in the group number of training sequence in synchronization related operation.This numerical value is bigger, synchronism
Can be better.
The 2nd, comprehensive prior art and time synchronized thresholding under each disturbed condition for the present invention, see table
Table the 3rd, table 4 and table 5.
The synchronization thresholding of lower each method that table 2 is noiseless
| Time domain Interference Detection algorithm | OFF | ON |
| Correlation technique | Sign bit | Select |
| Synchronization thresholding Es/N0 (dB) | -9 | -9 |
The synchronization thresholding of each method under table 3 impulse disturbances
| Relevant way selects | OFF | ON | ON |
| Interference position zero setting | OFF | OFF | ON |
| Correlation technique | Sign bit | Select | Select |
| Synchronization thresholding Es/N0 (dB) | -8 | -8 | -7 |
Synchronization thresholding under each method under table 4 SIR=-2dB single tone jamming
| Time domain Interference Detection algorithm | OFF | ON |
| Correlation technique | Sign bit | Select |
| Synchronization thresholding Es/N0 (dB) | 0 | -5 |
Synchronization thresholding under each method under table 5 SIR=-12.5dB broadband interference
| Time domain Interference Detection algorithm | OFF | ON |
| Correlation technique | Sign bit | Select |
| Synchronization thresholding Es/N0 (dB) | 13 | 7 |
Can learn from table the 2nd, table the 3rd, table the 4th, table 5 and emulation experiment:
1), under noiseless, compared to prior art, the present invention and prior art have identical time synchronized
Performance；
2) under single tone jamming, compared to prior art, the present invention has the gain of 5 dB；
3) under broadband interference, compared to prior art, the present invention has the gain of 6 dB；
4) under the conditions of impulse disturbances, compared to existing scheme, the present invention has the deterioration of 0.5 dB.
Thus, under the conditions of impulse disturbances, owing to the present invention has at time domain impulse noise detecting section a little
Erroneous judgement or fail to judge, a little performance loss can be brought, but, same under other white noise interference environments
Step performance has greatly to be improved.Thus, the present invention can be substantially improved prior art for noiseless
Time synchronized performance under environment, without deteriorating the time synchronized performance under interference environment, it is adaptable to multiple
The environment disturbing and depositing.
Additionally, jamproof processing method and process are also optimized by the present invention, herein below will be in detail
Illustrate that the embodiment of the present invention is realizing the anti-interference of synchronous method that sign bit quantifies and the long synchronous method of full word
Process.
The target of time synchronized is intended to find timing reference point, and then each data in locating frame head and structure of time slot
The position of section.Burst structure figure in the present invention refers to Fig. 8.
First the present invention judges to whether there is time domain impulse disturbances in environment, then according to result of determination
The method determining to use the long synchronous method of full word or sign bit to quantify.
The long synchronous method of full word of the present invention is as follows:
Assume xiFor sending signal, niFor white Gaussian noise, then receive signal expression such as following formula:
ri=xi+ni, i=0,1 ... L-1
Wherein, L is receipt signal length.
Assume skPrestoring sequence for this locality, carrying out related calculation receiving sequence and the sequence that prestores, correlation represents
For:
Wherein,
Under the noiseless environment of white noise, work as xk≠skWhen, due to skLess cross correlation, ε1, ε2It is
Smaller value, CiIt is worth also less, synchronous point will not be detected as.
If there is bursty interference, then now nkPower can be very big so that ε2Increase, work as CiIt is worth sufficiently large,
Will flase drop be synchronous point.
Can be drawn by above-mentioned derivation, the power jitter of receiving sequence r is to cause synchronizing the former of flase drop
Cause.Thus, it is proposed that the synchronous method that sign bit quantifies.
The synchronous method that sign bit quantifies refers to carry out sequence sign bit quantization, only needs a word in the implementation
Length just can represent sequence, and sign bit computing greatly reduces exploitation complexity.
The sequence that prestores receiving sequence and this locality respectively carries out sign bit quantization:
It is constant in steps that synchronous point detects other institutes.S after quantizationkStill there are good cross correlation and auto-correlation
Property, therefore, no matter rkPower how to shake, sign bit quantify after correlation power value but shake very little,
Only rk=skWhen just there will be bigger correlation, such that it is able to substantially increase time synchronized just examining probability,
Effectively reduce flase drop.
Another aspect according to embodiments of the present invention, additionally provides a kind of signal processing apparatus, as shown in Figure 9
This device includes:
Detection module 91, for detecting the interference type of current environment；
Select module 92, for selecting and the corresponding anti-interference processing method of interference type according to interference type.
Wherein, detection module 91 is further used for whether detection current environment exists time domain impulse disturbances.
Wherein, module 92 is selected to may include that further
First process submodule (not shown), is used in the case that current environment exists time domain impulse disturbances,
The method being quantified by sign bit carries out anti-interference process.
Wherein, module 92 is selected to may further include:
, for there is not the situation of time domain impulse disturbances when current environment in the second process submodule (not shown)
Under, carry out anti-interference process by the long synchronous method of full word.
Additionally, detection module 91 can further include:
Divide submodule (not shown), for the data of a slot length are divided into M detection window, M
≥0；
First calculating sub module (not shown), for calculating the average power content P of each detection windowm；
Second calculating sub module (not shown), for calculating the performance number of the sampled point of each detection window
First determination module (not shown), if for current detection windowThen judge current detection
There is time domain impulse disturbances in window, wherein a is a predetermined threshold；
Second determination module (not shown), if the number of the detection window for there is time domain impulse disturbances in data
Amount more than the half of detection window sum, then judges that current environment exists time domain impulse disturbances.
In sum, the technique scheme by means of the present invention, the present invention is by carrying out to interference type
Judge, according to the result of judgement, select corresponding synchronization scenario, burst can be effectively improved and do
Disturb, the inaccurate problem that or cannot synchronize of time synchronized under the conditions of single tone jamming and broadband interference, be suitable for
It in burst interference, the interference of single-tone band and broadband interference the environment deposited, is greatly improved the time same
The performance of step, thus promote systematic function.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Within bright spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included in this
Within bright protection domain.
Claims (10)
1. a signal processing method, it is characterised in that include:
The interference type of detection current environment；
Select and the corresponding anti-interference processing method of described interference type according to described interference type.
2. method according to claim 1, it is characterised in that doing of described detection current environment
Disturb type to include:
Detect whether described current environment exists time domain impulse disturbances.
3. method according to claim 1, it is characterised in that described according to described interference type
Corresponding anti-interference processing method includes with described interference type in selection:
In the case of there is time domain impulse disturbances in described current environment, the method being quantified by sign bit
Carry out anti-interference process.
4. method according to claim 1, it is characterised in that described according to described interference type
Corresponding anti-interference processing method farther includes with described interference type in selection:
In the case that described current environment does not exist time domain impulse disturbances, by the long synchronous method of full word
Carry out anti-interference process.
5. method according to claim 2, it is characterised in that the described current environment of described detection
Whether there is time domain impulse disturbances to include:
The data of one slot length are divided into M detection window, M >=0；
Calculate the average power content P of each detection windowm；
Calculate the performance number of the sampled point of each detection window described
If current detection windowThen judge that described current detection window exists time domain impulse disturbances,
Wherein a is a predetermined threshold；
If described data existing the quantity of the detection window of time domain impulse disturbances more than the one of detection window sum
Half, then judge that described current environment exists time domain impulse disturbances.
6. a signal processing apparatus, it is characterised in that include:
Detection module, for detecting the interference type of current environment；
Select module, for selecting corresponding with described interference type anti-interference according to described interference type
Processing method.
7. device according to claim 6, it is characterised in that described detection module is used further
Whether there is time domain impulse disturbances in the described current environment of detection.
8. device according to claim 6, it is characterised in that described selection module includes:
First process submodule, is used in the case that described current environment exists time domain impulse disturbances,
The method being quantified by sign bit carries out anti-interference process.
9. device according to claim 6, it is characterised in that described selection module is wrapped further
Include:
Second process submodule, is used in the case that described current environment does not exist time domain impulse disturbances,
Carry out anti-interference process by the long synchronous method of full word.
10. device according to claim 7, it is characterised in that described detection module is further
Including:
Divide submodule, for the data of a slot length are divided into M detection window, M >=0；
First calculating sub module, for calculating the average power content P of each detection windowm；
Second calculating sub module, for calculating the performance number of the sampled point of each detection window described
First determination module, if for current detection windowThen judge described current detection window
There is time domain impulse disturbances, wherein a is a predetermined threshold；
Second determination module, if the quantity of the detection window for there is time domain impulse disturbances in described data
More than the half of detection window sum, then judge that described current environment exists time domain impulse disturbances.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110022182A (en) * | 2018-01-10 | 2019-07-16 | 富士通株式会社 | Interference source prediction model method for building up, method for interference source identification, device and terminal device |
| CN111614593A (en) * | 2020-05-07 | 2020-09-01 | 重庆金美通信有限责任公司 | Synchronization method for resisting single-tone interference of OFDM system |
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Application publication date: 20161123 |