CN106160906A - Signal processing method and device - Google Patents
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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 the field of signal processing, and in particular, to a signal processing method and apparatus.
Background
Synchronization is a prerequisite for normal communication of all communication systems, in order to achieve better time synchronization performance, a sliding correlation method is generally adopted, a correlation value between a received sequence and a pre-stored sequence is calculated, then background noise is solved, then the ratio of the correlation value to the background noise is compared with a threshold, if the ratio is greater than the threshold, a synchronization point is considered to be detected, otherwise, no synchronization point is detected. This method is called a full word length time synchronization method, and fig. 1 is a schematic diagram of a time synchronization module when the joint correlation number is N, in fig. 1, D is the number of samples of a burst at the current received signal sampling rate, N is the joint correlation number, 0-D, 1-D, …, and N-1-0. The N sets of local sequences correspond to local sequences generated by the Midamble code used in burst #0, burst #1, burst #2, and … burst # N-1, respectively, in the frame structure. The received signal is firstly calculated with N groups of local pre-stored sequences to obtain a correlation value, then the square results of the N groups of correlation values are superposed, and the superposed result is sent to a background noise calculation and detection judgment module to finally obtain a time synchronization position. The figure shows a synchronization module of a single receiving antenna, if the receiving antenna is a plurality of receiving antennas, each antenna passes through the correlation result calculation module shown in the figure, and finally, the correlation superposition results of the plurality of antennas are sent to the superposition module together for bottom noise calculation and detection judgment. The synchronization method of sign bit quantization refers to that the sign bit quantization is carried out on a receiving sequence, the receiving sequence can be represented by only one bit word length in the realization, and the sign bit operation greatly reduces the development complexity.
The time synchronization scheme adopted by each communication system is a full word length time synchronization method, namely, a correlation value of a received training sequence and a pre-stored sequence is directly calculated, then background noise is solved, then the ratio of the correlation value to the background noise is compared with a threshold, if the ratio is greater than the threshold, a synchronization point is considered to be detected, otherwise, no synchronization point is detected. The threshold is obtained by simulation and is related to the actual environment.
However, time domain pulse interference with severe jitter may occur in an actual environment, and when such a communication environment is relatively severe, a time synchronization algorithm with a full word length may cause a relatively large power value obtained by correlation to exceed a threshold due to the presence of the severe jitter interference in a calculation process, and may be misjudged as a synchronization point, so that a misjudgment probability is increased, and thus, a time synchronization performance is deteriorated.
Therefore, the full word long time synchronization algorithm in a severe environment fails, and the failure reason is the power jitter of the receiving sequence.
The time synchronization algorithm of sign bit quantization enables a correlation result not to be influenced by the jitter of the power of a receiving sequence by carrying out sign bit quantization on the receiving sequence, and can represent the receiving sequence by only one bit of word length in the realization, thereby greatly reducing the development complexity.
The comparison result of the correlation values of certain data under the two synchronization methods of the full word length and the sign bit is simulated, and the comparison result is shown in fig. 2 and fig. 3.
The sign bit quantization method can effectively improve the time synchronization performance under the severe environment, but compared with the full word length method, the sign bit quantization method loses more amplitude information on the aspect of receiving signals. Therefore, the method of sign bit quantization deteriorates the performance of time synchronization without interference. That is, the full word length time synchronization algorithm is suitable for the interference-free environment, and the sign bit quantization method is suitable for the jitter interference environment. When burst interference, single tone interference and wideband interference exist simultaneously, the pure full word length method or sign bit quantization method deteriorates the performance of time synchronization.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
Aiming at the problems in the related art, the invention provides a signal processing method and a signal processing device, which can be applied to the situation that various interference environments coexist and can effectively improve the time synchronism of a system.
The technical scheme of the invention is realized as follows:
according to an aspect of the present invention, a signal processing method is provided.
The signal processing method comprises the following steps:
detecting the interference type of the current environment;
and selecting an anti-interference processing method corresponding to the interference type according to the interference type.
Wherein detecting the interference type of the current environment comprises:
and detecting whether the current environment has time domain pulse interference.
The anti-interference processing method for selecting the corresponding interference type according to the interference type comprises the following steps:
and under the condition that the current environment has time domain pulse interference, performing anti-interference processing by a sign bit quantization method.
The method for selecting the anti-interference processing corresponding to the interference type according to the interference type further comprises the following steps:
and when the current environment has no time domain pulse interference, performing anti-interference processing by a full-word-length synchronization method.
In addition, detecting whether the current environment has time domain pulse interference comprises:
dividing data of a time slot length into M detection windows, wherein M is more than or equal to 0;
calculating the average power value P of each detection windowm；
Calculating the power value of each sampling point of each detection window
If the current detection window isJudging that the current detection window has time domain pulse interference, wherein a is a preset threshold value;
and if the number of the detection windows with the time domain pulse interference in the data is more than half of the total number of the detection windows, judging that the time domain pulse interference exists in the current environment.
According to another aspect of the present invention, there is also provided a signal processing apparatus including:
the detection module is used for detecting the interference type of the current environment;
and the selection module is used for selecting the anti-interference processing method corresponding to the interference type according to the interference type.
And the detection module is further used for detecting whether the current environment has time domain pulse interference.
Wherein the selection module comprises:
and the first processing submodule is used for performing anti-interference processing by a sign bit quantization method under the condition that time domain pulse interference exists in the current environment.
Wherein the selection module further comprises:
and the second processing submodule is used for carrying out anti-interference processing by a full-word-length synchronization method under the condition that the current environment has no time domain pulse interference.
In addition, the detection module further comprises:
the division submodule is used for dividing data with one time slot length into M detection windows, wherein M is more than or equal to 0;
a first calculation submodule for calculating an average power value P for each detection windowm；
A second calculation submodule for calculating power values of the sampling points of each detection window
A first determination module for determining if the window is currently detectedJudging that the current detection window has time domain pulse interference, wherein a is a preset threshold value;
and the second judging module is used for judging that the time domain pulse interference exists in the current environment if the number of the detection windows with the time domain pulse interference in the data is more than half of the total number of the detection windows.
According to the invention, by judging the interference type and selecting a corresponding synchronization scheme according to the judgment result, the problem that the time synchronization is inaccurate or cannot be synchronized under the conditions of burst interference, single-tone interference and broadband interference can be effectively solved, the method is suitable for the environment with coexistence of burst interference, single-tone broadband interference and broadband interference, the time synchronization performance is greatly improved, and the system performance is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a diagram of a prior art time synchronization module when the joint correlation number is N;
FIG. 2 is a diagram illustrating simulation of full-word-length synchronous correlation values of certain data in the prior art;
FIG. 3 is a diagram illustrating simulation of a sign bit quantization synchronization correlation value of certain data in the prior art;
FIG. 4 is a flow chart of a signal processing method according to an embodiment of the invention;
FIG. 5 is a flow chart of a signal processing method according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a time-domain received signal waveform after adding impulse interference according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a time-domain received signal waveform after performing interference detection and interference rejection according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a burst structure according to an embodiment of the present invention;
fig. 9 is a block diagram of a signal processing apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
Based on the problems occurring in the prior art, the inventors found that the two time synchronization correlation methods have respective advantages for different interference modes: for the pulse interference with violent burst jitter, the anti-interference effect of the sign bit quantization method is better, and for other interference such as single tone, broadband and the like, the amplitude information is lost due to the sign bit quantization method, and the performance of the method is inferior to that of a full-word-length synchronization method. For the above reasons, a solution may be proposed, which considers that the interference type judgment is first performed before the synchronization, and then the correlation mode selection is performed based on the result of the interference type judgment, and after the time domain interference detection is completed, according to the result of the impulse interference detection, if the impulse interference is detected, a sign bit quantization method is used, if the impulse interference is not detected, a full word length method is used, and then the time synchronization is performed. As shown in fig. 4, for the data storage portion in the time synchronization anti-interference scheme of fig. 4, before an accurate synchronization point is not found, if interference detection is performed according to a burst length each time, it cannot be guaranteed that all the complete synchronization sequences are included in the selected data segment, and therefore, data after interference detection is performed is stored in a buffer each time, when sliding correlation is performed, a synchronization window sequentially slides over each data block after interference detection, and when the synchronization window slides out of the previous data, the data block can be discarded in the buffer.
According to an embodiment of the present invention, there is provided a signal processing method.
As shown in fig. 5, the signal processing method according to the embodiment of the present invention includes:
step S501, detecting the interference type of the current environment;
and step S503, selecting an anti-interference processing method corresponding to the interference type according to the interference type.
Specifically, when detecting the interference type of the current environment, it may be detected whether the current environment has time-domain impulse interference.
And if the current environment is detected to have time domain pulse interference, performing anti-interference processing by a sign bit quantization method.
And if the current environment is detected to have no time domain pulse interference, carrying out anti-interference treatment by a full-word-length synchronization method.
The method can be realized by a detection algorithm when detecting whether the current environment has time domain pulse interference, and comprises the following specific steps:
a: dividing data of a time slot length into M detection windows, wherein M is more than or equal to 0;
b: the average power value P is determined for each window M (M is 0,1, …, M-1)m；
C: calculating the power value of each sampling point in each window
D: for each window m, compareAnd aPm(wherein the coefficient a is obtained by simulation, and the threshold value has a direct relation with the interference types such as number, duration, strength and the like in a typical environment, so that the selection of the threshold value needs to be considered in combination with the actual situation);
e: for each window m, if presentConsidering that the time domain pulse interference is detected in the window, otherwise, considering that the time domain pulse interference is not detected in the window;
f: if the number of windows in which the impulse interference is detected is more than half of the total number of windows, the existence of the impulse interference is considered, otherwise, the existence is not considered.
And then, carrying out subsequent processing according to the interference judgment result, if pulse interference exists, carrying out anti-interference processing by adopting a sign bit quantization method, and if no pulse interference exists, carrying out anti-interference processing by adopting a full-word length synchronization method. The effect of the impulse disturbance detection algorithm is shown in fig. 6 and 7. To characterize the effect of the algorithm, fig. 7 zeroes the impulse interference locations.
In addition, two processing methods of zero setting and non-zero setting can be carried out on the detected pulse interference position, zero setting operation is not carried out, theoretically, zero setting can cause a subsequent correlation algorithm to lose some amplitude prior information, and the non-zero setting has gain relative to zero setting through simulation verification. It should be understood that the invention may also be used to appropriately select the zeroing or non-zeroing process when appropriate.
The prior art can improve the problem of inaccurate time synchronization in a severe environment, but the time synchronization performance for a non-interference environment is deteriorated to a certain extent because the method of sign bit quantization loses some amplitude information compared with the traditional full word length synchronization method.
The invention provides a time synchronization anti-interference method based on relevant mode selection, which has different advantages for different interference types based on different time synchronization methods. The specific scheme is that whether time domain pulse interference with severe jitter exists in the environment is judged, then according to a judgment result, if the pulse interference exists, a sign bit quantization time synchronization method is adopted, and if the time domain pulse interference does not exist, a full word length time synchronization method is adopted. After which time synchronization is performed.
Compared with the prior art, the method is suitable for the environment with various interference types, can avoid the deterioration of the time synchronization performance of the prior art under the non-interference environment, achieves the effect of different processing on different interferences, and is suitable for various interference environments.
The time synchronization anti-interference performance of the invention is simulated and evaluated, wherein the simulation conditions and assumptions are as follows:
table 1 simulation conditions and assumptions
Note: the joint correlation number is the number of groups of training sequences participating in the synchronous correlation operation. The larger this value, the better the synchronization performance.
The time synchronization threshold under each interference condition is shown in table 2, table 3, table 4 and table 5 by integrating the prior art scheme and the invention.
TABLE 2 synchronization thresholds for methods without interference
| Time domain interference detection algorithm | OFF | ON |
| Correlation method | Sign bit | Selecting |
| Synchronization threshold Es/N0(dB) | -9 | -9 |
TABLE 3 synchronization thresholds for methods under impulse interference
| Correlation mode selection | OFF | ON | ON |
| Interference position nulling | OFF | OFF | ON |
| Correlation method | Sign bit | Selecting | Selecting |
| Synchronization threshold Es/N0(dB) | -8 | -8 | -7 |
Table 4 synchronization thresholds under each method under SIR-2 dB tone interference
| Time domain interference detection algorithm | OFF | ON |
| Correlation method | Sign bit | Selecting |
| Synchronization threshold Es/N0(dB) | 0 | -5 |
Table 5 synchronization thresholds under each method under-12.5 dB wide-band interference
| Time domain interference detection algorithm | OFF | ON |
| Correlation method | Sign bit | Selecting |
| Synchronization threshold Es/N0(dB) | 13 | 7 |
From tables 2, 3, 4, 5 and simulation experiments, it can be seen that:
1) compared with the prior art, the invention has the same time synchronization performance with the prior art scheme without interference;
2) compared with the prior art, the invention has 5dB gains under single-tone interference;
3) compared with the prior art, the invention has the advantages that under broadband interference, the gain of 6 dB is realized;
4) under impulse interference conditions, the present invention has a 0.5 dB penalty compared to the prior art schemes.
Therefore, under the condition of pulse interference, the invention has little misjudgment or missed judgment in the time domain pulse interference detection part, and can bring little performance loss, but the synchronization performance under other white noise interference environments can be greatly improved. Therefore, the invention can greatly improve the time synchronization performance of the prior art scheme under the interference-free environment without deteriorating the time synchronization performance under the interference environment, and is suitable for the environment with various interferences coexisting.
In addition, the present invention optimizes the processing method and process of resisting interference, and the following content will describe in detail the anti-interference process of the synchronization method for realizing sign bit quantization and the full word length synchronization method in the embodiments of the present invention.
The aim of time synchronization is to find a timing reference point and then locate the position of each data segment in the frame header and time slot structure. Fig. 8 shows a burst structure in the present invention.
The invention firstly judges whether time domain pulse interference exists in the environment, and then determines whether a full word length synchronization method or a sign bit quantization method is adopted according to the judgment result.
The full word length synchronization method of the invention comprises the following steps:
let x beiFor transmitting signals, niIf the received signal is white gaussian noise, the received signal is expressed as follows:
ri＝xi+ni,i＝0,1,…L-1
where L is the received signal length.
Suppose skPerforming correlation operation on the received sequence and the pre-stored sequence for a local pre-stored sequence, wherein the correlation value is represented as:
wherein,
in a white-noise-free environment, when xk≠skWhen due to skThe small cross-correlation of the signal to the signal,1，2are all relatively small values, CiThe value is also small and will not be detected as a synchronization point.
If there is bursty interference, then n is present at this timekWill be so great that2Increase when CiThe value is large enough to be falsely detected as a synchronization point.
It can be derived from the above derivation that the power jitter of the received sequence r is the cause of the synchronization error detection. Thus, a synchronization method of sign bit quantization is proposed.
The synchronization method of sign bit quantization refers to that the sign bit quantization is carried out on a sequence, the sequence can be represented by only one bit of word length in the realization, and the sign bit operation greatly reduces the development complexity.
Respectively carrying out sign bit quantization on the received sequence and the local prestored sequence:
the synchronization point detection is unchanged for all other steps. Quantized skThere is still very good cross-correlation and auto-correlation, and therefore, no matter rkThe power of the signal is jittered, the related power value after the sign bit quantization is jittered very little, and only rk＝skThe larger correlation value appears in the time, so that the time synchronization positive detection probability can be greatly improved, and the false detection is effectively reduced.
According to another aspect of the embodiments of the present invention, there is also provided a signal processing apparatus, as shown in fig. 9, including:
a detection module 91, configured to detect an interference type of a current environment;
and the selecting module 92 is configured to select an anti-interference processing method corresponding to the interference type according to the interference type.
Wherein, the detecting module 91 is further configured to detect whether there is time-domain impulse interference in the current environment.
Wherein, the selecting module 92 further comprises:
and a first processing sub-module (not shown) for performing anti-interference processing by a sign bit quantization method in the presence of time domain impulse interference in the current environment.
Wherein, the selecting module 92 may further include:
and a second processing sub-module (not shown) for performing anti-interference processing by a full-word length synchronization method when there is no time-domain pulse interference in the current environment.
In addition, the detection module 91 may further include:
a division submodule (not shown) for dividing data of a time slot length into M detection windows, wherein M is more than or equal to 0;
a first calculation submodule (not shown) for calculating the mean power value P for each detection windowm；
A second calculation submodule (not shown) for calculating power values of the sampling points of each detection window
A first decision module (not shown) for deciding if the window is currently detectedJudging that the current detection window has time domain pulse interference, wherein a is a preset threshold value;
and a second determining module (not shown) configured to determine that the time-domain impulse interference exists in the current environment if the number of detection windows in which the time-domain impulse interference exists in the data is greater than half of the total number of the detection windows.
In summary, according to the above technical solutions of the present invention, the interference type is determined, and a corresponding synchronization scheme is selected according to the result of the determination, so that the problem of inaccurate or unsynchronized time synchronization under the conditions of burst interference, single-tone interference and broadband interference can be effectively solved, and the method and the device are suitable for an environment in which burst interference, single-tone band interference and broadband interference coexist, and greatly improve the performance of time synchronization, thereby improving the system performance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A signal processing method, comprising:
detecting the interference type of the current environment;
and selecting an anti-interference processing method corresponding to the interference type according to the interference type.
2. The method of claim 1, wherein the detecting the type of interference in the current environment comprises:
and detecting whether the current environment has time domain pulse interference.
3. The method of claim 1, wherein the selecting the anti-interference processing method corresponding to the interference type according to the interference type comprises:
and when the current environment has time domain pulse interference, performing anti-interference processing by a sign bit quantization method.
4. The method of claim 1, wherein the selecting the anti-interference processing method corresponding to the interference type according to the interference type further comprises:
and when the current environment has no time domain pulse interference, performing anti-interference processing by a full-word length synchronization method.
5. The method of claim 2, wherein the detecting whether the current environment has time-domain impulse interference comprises:
dividing data of a time slot length into M detection windows, wherein M is more than or equal to 0;
calculating the average power value P of each detection windowm；
Calculating the power value of the sampling point of each detection window
If the current detection window isJudging that the current detection window has time domain pulse interference, wherein a is a preset threshold value;
and if the number of the detection windows with the time domain pulse interference in the data is more than half of the total number of the detection windows, judging that the time domain pulse interference exists in the current environment.
6. A signal processing apparatus, characterized by comprising:
the detection module is used for detecting the interference type of the current environment;
and the selection module is used for selecting an anti-interference processing method corresponding to the interference type according to the interference type.
7. The apparatus of claim 6, wherein the detecting module is further configured to detect whether there is time-domain impulse interference in the current environment.
8. The apparatus of claim 6, wherein the selection module comprises:
and the first processing submodule is used for performing anti-interference processing by a sign bit quantization method under the condition that time domain pulse interference exists in the current environment.
9. The apparatus of claim 6, wherein the selection module further comprises:
and the second processing submodule is used for carrying out anti-interference processing by a full-word-length synchronization method under the condition that the current environment has no time domain pulse interference.
10. The apparatus of claim 7, wherein the detection module further comprises:
the division submodule is used for dividing data with one time slot length into M detection windows, wherein M is more than or equal to 0;
a first calculation submodule for calculating an average power value P for each detection windowm；
A second calculation submodule for calculating the power value of the sampling point of each detection window
A first determination module for determining if the window is currently detectedJudging that the current detection window has time domain pulse interference, wherein a is a preset threshold value;
and the second judging module is used for judging that the time domain pulse interference exists in the current environment if the number of the detection windows with the time domain pulse interference in the data is more than half of the total number of the detection windows.
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Application publication date: 20161123 |