CN103209006A - Method and device for eliminating impulse noise - Google Patents
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Abstract
The invention discloses a method and a device for eliminating impulse noise, and belongs to the field of communication. The method comprises the following steps of: acquiring a carrier wave periodically to acquire time-domain signals which are included within a period; selecting a time-domain signal of which the signal power is smaller than a preset power threshold value from the time-domain signals which are included within the period; calculating average power according to the signal power of the selected time-domain signal; and detecting and eliminating the impulse noise in the time-domain signals which are included within the period according to the average power. The device comprises an acquisition module, a first selection module, a first calculation module and a first elimination module. According to the method and the device, the average power is calculated according to the selected time-domain signal of which the signal power is smaller than the preset power threshold value; and the impulse noise in the time-domain signals is detected and eliminated according to the average power to improve the accuracy of detecting the impulse noise, so that the influence of the impulse noise on the time-domain signals can be eliminated better.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for eliminating impulse noise.
Background
In a PLC (Power-Line Communication) system, impulse noise is a very typical and common disturbance. The impulse noise has the characteristics of abrupt change, high energy and wide coverage frequency range, has great influence on carrier signals, and is the main reason influencing the normal work of the whole system in data communication.
The prior art provides a method for eliminating impulse noise, which specifically comprises the following steps: the method comprises the steps of periodically collecting carriers, obtaining time domain signals included in one period, respectively calculating the signal power of the time domain signals included in the one period according to the signal values of the time domain signals included in the one period, further calculating the average power according to the signal power, detecting the time domain signals affected by impulse noise from the time domain signals included in the one period according to the average power, and further setting the detected signal values of the time domain signals affected by the impulse to be zero or the maximum value of a system so as to eliminate the influence of the impulse noise on the time domain signals.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
under the influence of impulse noise with high peak-to-average ratio or longer duration, the signal values of a part of time domain signals in the acquired time domain signals included in one period become very large, so that the calculated average power is too large, some time domain signals influenced by the impulse noise cannot be detected, and the influence of the impulse noise on the time domain signals cannot be eliminated better.
Disclosure of Invention
In order to improve the accuracy of pulse noise detection and better eliminate the influence of pulse noise on a time domain signal, the invention provides a method and a device for eliminating pulse noise. The technical scheme is as follows:
in a first aspect, a method of canceling impulse noise, the method comprising:
the method comprises the steps of periodically collecting carriers to obtain time domain signals included in a period;
selecting a time domain signal of which the signal power is smaller than a preset power threshold value from the time domain signals included in the period;
calculating the average power according to the signal power of the selected time domain signal;
according to the average power, impulse noise is detected and removed from a time domain signal included in the one period.
With reference to the first aspect, in a first possible implementation manner of the first aspect, before the selecting, from the time domain signals included in the one period, a time domain signal whose signal power is smaller than a preset power threshold, the method further includes:
respectively calculating the signal power of each time domain signal included in the period according to the signal value of each time domain signal included in the period;
selecting a maximum signal power from signal powers of time domain signals included in the one period;
setting the power threshold according to the maximum signal power.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the setting the power threshold according to the maximum signal power includes:
calculating the product of the maximum signal power and a preset coefficient, setting the product of the maximum signal power and the preset coefficient as the power threshold, and setting the product of the maximum signal power and the preset coefficient as the preset power threshold; or,
and setting the maximum signal power as the power threshold, wherein the maximum signal power is the preset power threshold.
With reference to the first aspect, in a third possible implementation manner of the first aspect, the detecting and removing impulse noise from the time-domain signal included in the one period according to the average power includes:
respectively determining the symbol of each time domain signal included in the period;
detecting and acquiring a time domain signal influenced by impulse noise in any symbol according to the average power;
selecting time domain signals with continuous sequence numbers from the time domain signals affected by the impulse noise in the symbol, and counting the number of the selected time domain signals;
and if the number of the selected time domain signals is greater than or equal to a preset first number, discarding the symbol to eliminate the impulse noise.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the method further includes:
and if the number of the selected time domain signals is less than the preset first number and greater than or equal to the preset second number, setting the signal value of the time domain signal affected by the impulse noise in the symbol as a preset signal value so as to eliminate the impulse noise.
With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the method further includes:
if the number of the selected time domain signals is smaller than the preset second number, two time domain signals which are not influenced by impulse noise and are closest to any one time domain signal influenced by impulse noise in the symbol are obtained, the signal value of the time domain signal influenced by the impulse noise is estimated according to the obtained signal values of the two time domain signals, and the signal value of the time domain signal influenced by the impulse noise is set as the estimated signal value so as to eliminate the impulse noise.
In a second aspect, an apparatus for canceling impulse noise, the apparatus comprising:
the acquisition module is used for periodically acquiring the carrier waves to acquire a time domain signal included in one period;
the first selection module is used for selecting a time domain signal of which the signal power is smaller than a preset power threshold value from the time domain signals included in the period;
the first calculation module is used for calculating the average power according to the signal power of the selected time domain signal;
and the first eliminating module is used for detecting and eliminating impulse noise from the time domain signal included in the period according to the average power.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the apparatus further includes:
a second calculating module, configured to calculate, according to the signal value of each time-domain signal included in the one period, a signal power of each time-domain signal included in the one period respectively;
a second selecting module, configured to select a maximum signal power from signal powers of the time-domain signals included in the one period;
and the setting module is used for setting the power threshold according to the maximum signal power.
With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the setting module includes:
the first setting unit is used for calculating the product of the maximum signal power and a preset coefficient, setting the product of the maximum signal power and the preset coefficient as the power threshold, and setting the product of the maximum signal power and the preset coefficient as the preset power threshold; or,
and the second setting unit is used for setting the maximum signal power as the power threshold, wherein the maximum signal power is the preset power threshold.
With reference to the second aspect, in a third possible implementation manner of the second aspect, the first eliminating module includes:
a determining unit, configured to determine a symbol in which each time domain signal included in the one period is located, respectively;
the detection unit is used for detecting and acquiring a time domain signal influenced by impulse noise in any symbol according to the average power;
a selecting unit, configured to select time domain signals with consecutive sequence numbers from the time domain signals affected by the impulse noise in the symbol, and count the number of the selected time domain signals;
and the elimination unit is used for discarding the symbol to eliminate the impulse noise if the number of the selected time domain signals is greater than or equal to a preset first number.
With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the apparatus further includes:
and the second eliminating module is used for setting the signal value of the time domain signal affected by the impulse noise in the symbol as a preset signal value to eliminate the impulse noise if the number of the selected time domain signals is less than the preset first number and is greater than or equal to a preset second number.
With reference to the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the apparatus further includes:
a third eliminating module, configured to, if the number of the selected time domain signals is smaller than the preset second number, obtain two time domain signals that are not affected by impulse noise and are closest to any one of the time domain signals affected by impulse noise in the symbol, estimate a signal value of the time domain signal affected by impulse noise according to the obtained signal values of the two time domain signals, and set the signal value of the time domain signal affected by impulse noise as the estimated signal value to eliminate impulse noise.
In a third aspect, an apparatus for impulse noise cancellation includes a first memory and a first processor, and is configured to perform a method for impulse noise cancellation according to any one of the first aspect.
In the embodiment of the invention, the carrier waves are periodically collected, the time domain signals included in one period are obtained, the time domain signals with the signal power smaller than the preset power threshold value are selected from the time domain signals included in the one period, the average power of the selected time domain signals is calculated, and the impulse noise is eliminated from the time domain signals included in the one period according to the average power.
Drawings
Fig. 1 is a flowchart of a method for eliminating impulse noise according to embodiment 1 of the present invention;
fig. 2 is a flowchart of a method for eliminating impulse noise according to embodiment 2 of the present invention;
fig. 3 is a flowchart of a method for eliminating impulse noise according to embodiment 2 of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for removing impulse noise according to embodiment 3 of the present invention;
fig. 5 is a schematic structural diagram of an apparatus for eliminating impulse noise according to embodiment 4 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a method for eliminating impulse noise, where the method includes:
step 101: the method comprises the steps of periodically collecting carriers to obtain time domain signals included in a period;
step 102: selecting a time domain signal of which the signal power is smaller than a preset power threshold value from the time domain signals included in the period;
step 103: calculating the average power according to the signal power of the selected time domain signal;
step 104: impulse noise is detected and removed from the time domain signal included in the one period based on the average power.
In the embodiment of the invention, the carrier waves are periodically collected, the time domain signals included in one period are obtained, the time domain signals with the signal power smaller than the preset power threshold value are selected from the time domain signals included in the one period, the average power of the selected time domain signals is calculated, and the impulse noise is detected and eliminated from the time domain signals included in the one period according to the average power.
Example 2
As shown in fig. 2, an embodiment of the present invention provides a method for eliminating impulse noise, where the method includes:
step 201: the method comprises the steps of periodically collecting carriers to obtain time domain signals included in a period;
specifically, the time domain signal acquisition device periodically acquires a carrier, and acquires a time domain signal included in one period of the carrier.
Step 202: calculating the signal power of each time domain signal included in the period according to the signal value of each time domain signal included in the period;
specifically, the signal power of the time domain signal included in one period acquired from the carrier is calculated from the signal value of the time domain signal and formula (1).
p=|x|2……（1）
Where x is a signal value of any time-domain signal included in one period, and p is a signal power of the time-domain signal.
For each time domain signal included in the one period, the signal power thereof is obtained according to equation (1).
Step 203: setting a power threshold value according to the signal power of each time domain signal included in the one period;
specifically, the maximum signal power is selected from the signal powers of the time-domain signals included in the one period based on the signal power of each time-domain signal included in the one period, the product of the maximum signal power and a preset first coefficient is calculated, and the product of the maximum signal power and the preset first coefficient is set as a power threshold, or
The maximum signal power is set to a power threshold.
The preset first coefficient may be any value between 0 and 1, a value of the preset first coefficient may be specifically determined according to an actual situation, and when the duration of impulse noise received by the system is long or a peak value of the impulse noise is large in one period, a smaller preset first coefficient may be selected.
Preferably, the preset first coefficient may be a peak-to-average value of the system.
For example, assume that 10 time domain signals are acquired from a carrier in one period, which are: x1, x2, x3, x4, … … and x10, and the signal power of each time domain signal is p1, p2, p3, p4, … … and p10 respectively, if the signal power p9 of the 9 th time domain signal is the maximum signal power and the preset first coefficient is the peak-to-average value 0.25 of the system, the product of the maximum signal power p9 and the preset first coefficient 0.25 is set as the power threshold.
Step 204: selecting a time domain signal of which the signal power is smaller than a set power threshold value from the time domain signals included in the period;
specifically, the power of each time domain signal included in the one period calculated in step 202 is respectively compared with the set power threshold, and the time domain signal whose signal power is smaller than the set power threshold is selected from all the time domain signals included in the one period.
For example, assume that 10 time domain signals are acquired from the carrier in the one period, which are: x1, x2, x3, x4, … … and x10, the signal power of each time domain signal is p1, p2, p3, p4, … … and p10 respectively, the set power threshold is 0.25p9, and if p1, p2, p5, p6 and p7 are smaller than the set power threshold, x1, x2, x5, x6 and x7 are selected.
The time domain signals with the signal power smaller than the set power threshold are selected from the time domain signals included in the period, so that the time domain signals included in the period and greatly affected by impulse noise can be eliminated.
Step 205: calculating the average power according to the signal power of the selected time domain signal;
for example, assuming that the selected time domain signals are x1, x2, x5, x6, and x7, and the signal powers of the selected time domain signals are p1, p2, p5, p6, and p7, respectively, the average values of p1, p2, p5, p6, and p7 are calculated as average powers.
The selected time domain signal is the time domain signal of which the signal power is smaller than the set power threshold value in the time domain signal included in the period, and the calculated average power is closer to an actual value because the time domain signal which is greatly influenced by impulse noise and included in the period is eliminated, so that the time domain signal influenced by the impulse noise can be more accurately detected.
Step 206: impulse noise is detected and removed from the time domain signal included in the one period based on the average power.
As shown in fig. 3, the step may include the following steps (1) to (5), which are respectively:
step (1): respectively determining the symbol of each time domain signal included in the period;
for example, suppose that 2000 time domain signals are acquired from a carrier in one period, which are: x1, x2, x3, x4, … … and x2000, wherein x1, x2, x3, x4, … … and x1024 are located at the symbol 1, and x1025, x1026, x1027, x1028, … … and x2000 are located at the symbol 2.
Step (2): detecting and acquiring a time domain signal influenced by impulse noise in any symbol according to the average power;
specifically, an average power threshold is first set according to the average power, then the signal power of each time domain signal in any one symbol is compared with the set average power threshold, and if the signal power of the time domain signal is greater than the set average power threshold, the time domain signal is determined to be the time domain signal affected by impulse noise.
Wherein the product of the average power and the preset second coefficient may be calculated and the product of the average power and the preset second coefficient may be set as the average power threshold, or the average power may be set as the average power threshold.
The preset second coefficient may be any value between 0 and 1, a value of the preset second coefficient may be specifically determined according to an actual situation, and when the duration of impulse noise received by the system is long or a peak value of the impulse noise is large in one cycle, a smaller preset second coefficient may be selected.
Preferably, the preset second coefficient may be a peak-to-average value of the system.
For example, assume that the average power is paveIf the preset second coefficient is the peak-to-average value of the system 0.25, the average power p is calculatedaveAnd a preset second coefficient of 0.25, the signal power p1, p2, p3, p4, … …, p1024 of each time domain signal x1, x2, x3, x4, … …, x1024 in the symbol 1 and the set average power threshold of 0.25paveAnd in comparison, if the signal power of the time domain signal is greater than the set average power threshold value, determining the time domain signal as the time domain signal affected by the impulse noise.
And (3): selecting time domain signals with continuous sequence numbers from time domain signals affected by impulse noise in one symbol, and counting the number of the selected time domain signals;
if a plurality of groups of time domain signals with continuous sequence numbers and influenced by impulse noise possibly exist in one symbol, selecting all time domain signals with continuous sequence numbers, and counting the number of the selected time domain signals.
For example, assume that the time domain signals affected by impulse noise in symbol 1 are x1, x3, x4, … …, x10, x1001, x1002, … …, and x1024, the time domain signals with consecutive sequence numbers are x3, x4, … …, x10, and x1001, x1002, … …, and x1024, and the number of the time domain signals selected is 32.
And (4): judging whether the number of the selected time domain signals is larger than or equal to a preset first number, if so, executing the step (5), and if so, executing the step (6);
and (5): discarding the symbol to eliminate impulse noise, and ending;
when the number of the selected time domain signals is greater than or equal to the preset first number, it is indicated that a lot of time domain signals influenced by impulse noise exist in the symbol, and the impulse noise can be better eliminated by adopting a method of discarding the symbol.
And (6): judging whether the number of the selected time domain signals is larger than or equal to a preset second number or not, if so, executing the step (7), and if not, executing the step (8);
and (7): setting the signal value of the time domain signal affected by the impulse noise in the symbol as a preset signal value to eliminate the impulse noise, and ending;
wherein the preset signal value may be zero or a maximum value allowable by the system.
And (8): acquiring two time domain signals which are not influenced by impulse noise and are closest to any one time domain signal influenced by impulse noise in the symbol, estimating the signal value of the time domain signal influenced by the impulse noise according to the acquired signal values of the two time domain signals, and setting the signal value of the time domain signal influenced by the impulse noise as the estimated signal value so as to eliminate the impulse noise.
The values of the preset first number and the preset second number can be specifically determined according to actual conditions.
The method for eliminating the impulse noise on the symbol in different modes is determined according to the number of the selected time domain signals, so that the influence of the impulse noise can be eliminated better, and particularly under the condition that the duration time of the impulse noise is longer, the method for eliminating the influence of the impulse noise in different modes according to the number of the time domain signals influenced by the impulse noise on different symbols can achieve the better effect of eliminating the influence of the impulse noise.
For example, assuming that the preset first number is 100 and the preset second number is 70, if the number of the time domain signals selected in symbol 1 is 118, the symbol 1 is discarded to eliminate the impulse noise;
if the number of the time domain signals selected in the symbol 2 is 87, setting the signal value of the time domain signal affected by the impulse noise in the symbol 2 as a preset signal value to eliminate the impulse noise;
if the number of the time domain signals selected in the symbol 3 is 35, acquiring two time domain signals which are not affected by impulse noise and are closest to any one of the time domain signals affected by the impulse noise in the symbol 3, estimating a signal value of the time domain signal affected by the impulse noise according to the acquired signal values of the two time domain signals, setting the signal value of the time domain signal affected by the impulse noise as an estimated signal value, estimating the signal value of the time domain signal affected by the impulse noise by acquiring two time domain signals which are not affected by the impulse noise and are closest to the time domain signal affected by the impulse noise for each time domain signal affected by the impulse noise in the symbol 3, and setting the signal value of the time domain signal affected by the impulse noise as the estimated signal value to eliminate the impulse noise.
Wherein step 206 is performed for the time domain signal on each symbol included in the one period, and the impulse noise is eliminated from the time domain signal included in the one period.
In the embodiment of the invention, the carrier wave is periodically collected, the time domain signal included in one period is obtained, the time domain signal of which the signal power is smaller than the preset power threshold value is selected from the time domain signal included in the one period, the average power of the selected time domain signal is calculated, and the impulse noise is detected and eliminated from the time domain signal included in the one period according to the average power, because the average power is calculated according to the time domain signal of which the selected signal power is smaller than the preset power threshold value, the time domain signal greatly influenced by the impulse noise is eliminated, the calculated average power is closer to the actual value, thereby the accuracy of impulse noise detection can be improved, the influence of the impulse noise on the time domain signal is better eliminated, and simultaneously, the impulse noise is eliminated by adopting different methods according to the difference of the number of the time domain signals influenced by the impulse noise on each symbol, the influence of impulse noise can be better eliminated.
In the case of the example 3, the following examples are given,
as shown in fig. 4, an embodiment of the present invention provides an apparatus for removing impulse noise, including:
an acquisition module 301, configured to periodically acquire a carrier, and acquire a time domain signal included in one period;
a first selecting module 302, configured to select a time domain signal with a signal power smaller than a preset power threshold from the time domain signals included in the period;
a first calculating module 303, configured to calculate an average power according to the signal power of the selected time-domain signal;
a first removing module 304, configured to detect and remove impulse noise from the time domain signal included in the one period according to the average power.
Further, the apparatus further comprises:
a second calculating module 305, configured to calculate a signal power of each time domain signal included in the one period according to a signal value of each time domain signal included in the one period;
a second selecting module 306, configured to select a maximum signal power from the signal powers of the time-domain signals included in the period;
a setting module 307, configured to set a power threshold according to the maximum signal power.
Wherein the setting module 307 comprises:
a first setting unit 3071, configured to calculate a product of the maximum signal power and a preset coefficient, set the product of the maximum signal power and the preset coefficient as a power threshold, where the product of the maximum signal power and the preset coefficient is a preset power threshold; or,
the second setting unit 3072 is configured to set the maximum signal power as a power threshold, where the maximum signal power is a preset power threshold.
Wherein the first cancellation module 304 comprises:
a determining unit 3041, configured to determine a symbol in which each time domain signal included in the one period is located;
a detecting unit 3042, configured to detect and obtain a time domain signal affected by impulse noise in any symbol according to the average power;
a selecting unit 3043, configured to select a time domain signal with a continuous sequence number from the time domain signals affected by the impulse noise in the symbol, and count the number of the selected time domain signals;
a removing unit 3044, configured to discard the symbol to remove the impulse noise if the number of the selected time domain signals is greater than or equal to a preset first number.
Further, the apparatus further comprises:
the second eliminating module 308 is configured to set a signal value of the time domain signal affected by the impulse noise in the symbol to a preset signal value if the number of the selected time domain signals is smaller than the preset first number and greater than or equal to the preset second number, so as to eliminate the impulse noise.
Further, the apparatus further comprises:
a third eliminating module 309, configured to, if the number of the selected time domain signals is smaller than the preset second number, obtain two time domain signals that are not affected by the impulse noise and are closest to any one of the time domain signals affected by the impulse noise in the symbol, estimate a signal value of the time domain signal affected by the impulse noise according to the obtained signal values of the two time domain signals, and set the signal value of the time domain signal affected by the impulse noise as the estimated signal value to eliminate the impulse noise.
In the embodiment of the invention, the carrier waves are periodically collected, the time domain signals included in one period are obtained, the time domain signals with the signal power smaller than the preset power threshold value are selected from the time domain signals included in the one period, the average power of the selected time domain signals is calculated, and the impulse noise is detected and eliminated from the time domain signals included in the one period according to the average power.
Example 4
As shown in fig. 5, an embodiment of the present invention provides an apparatus for removing impulse noise, including:
a first memory 401 and a first processor 402 for performing the following method of canceling impulse noise:
the method comprises the steps of periodically collecting carriers to obtain time domain signals included in a period;
selecting a time domain signal of which the signal power is smaller than a preset power threshold value from the time domain signals included in the period;
calculating the average power according to the signal power of the selected time domain signal;
impulse noise is detected and removed from the time domain signal included in the one period based on the average power.
Further, before selecting a time domain signal with a signal power smaller than a preset power threshold from the time domain signals included in the one period, the method further includes:
calculating the signal power of each time domain signal included in the period according to the signal value of each time domain signal included in the period;
selecting a maximum signal power from signal powers of time domain signals included in the one period;
the power threshold is set according to the maximum signal power.
Wherein, setting the power threshold according to the maximum signal power comprises:
calculating the product of the maximum signal power and a preset coefficient, setting the product of the maximum signal power and the preset coefficient as a power threshold, and setting the product of the maximum signal power and the preset coefficient as a preset power threshold; or,
and setting the maximum signal power as a power threshold, wherein the maximum signal power is a preset power threshold.
Wherein detecting and removing impulse noise from a time domain signal included in the one period according to the average power includes:
respectively determining the symbol of each time domain signal included in the period;
detecting and acquiring a time domain signal influenced by impulse noise in any symbol according to the average power;
selecting time domain signals with continuous sequence numbers from the time domain signals affected by the impulse noise in the symbol, and counting the number of the selected time domain signals;
and if the number of the selected time domain signals is greater than or equal to the preset first number, discarding the symbol to eliminate the impulse noise.
Further, the method further comprises:
and if the number of the selected time domain signals is less than the preset first number and greater than or equal to the preset second number, setting the signal value of the time domain signal affected by the impulse noise in the symbol as the preset signal value so as to eliminate the impulse noise.
Further, the method further comprises:
if the number of the selected time domain signals is smaller than the preset second number, two time domain signals which are not influenced by the impulse noise and are closest to any one time domain signal influenced by the impulse noise in the symbol are obtained, the signal value of the time domain signal influenced by the impulse noise is estimated according to the obtained signal values of the two time domain signals, and the signal value of the time domain signal influenced by the impulse noise is set as the estimated signal value so as to eliminate the impulse noise.
In the embodiment of the invention, the carrier waves are periodically collected, the time domain signals included in one period are obtained, the time domain signals with the signal power smaller than the preset power threshold value are selected from the time domain signals included in the one period, the average power of the selected time domain signals is calculated, and the impulse noise is detected and eliminated from the time domain signals included in the one period according to the average power.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
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 (13)
1. A method of canceling impulse noise, the method comprising:
the method comprises the steps of periodically collecting carriers to obtain time domain signals included in a period;
selecting a time domain signal of which the signal power is smaller than a preset power threshold value from the time domain signals included in the period;
calculating the average power according to the signal power of the selected time domain signal;
according to the average power, impulse noise is detected and removed from a time domain signal included in the one period.
2. The method of claim 1, wherein before the selecting the time domain signal having the signal power smaller than the preset power threshold from the time domain signals included in the one period, further comprising:
respectively calculating the signal power of each time domain signal included in the period according to the signal value of each time domain signal included in the period;
selecting a maximum signal power from signal powers of time domain signals included in the one period;
setting the power threshold according to the maximum signal power.
3. The method of claim 2, wherein said setting the power threshold in accordance with the maximum signal power comprises:
calculating the product of the maximum signal power and a preset coefficient, setting the product of the maximum signal power and the preset coefficient as the power threshold, and setting the product of the maximum signal power and the preset coefficient as the preset power threshold; or,
and setting the maximum signal power as the power threshold, wherein the maximum signal power is the preset power threshold.
4. The method of claim 1, wherein said detecting and removing impulse noise from a time domain signal included in said one period based on said average power comprises:
respectively determining the symbol of each time domain signal included in the period;
detecting and acquiring a time domain signal influenced by impulse noise in any symbol according to the average power;
selecting time domain signals with continuous sequence numbers from the time domain signals affected by the impulse noise in the symbol, and counting the number of the selected time domain signals;
and if the number of the selected time domain signals is greater than or equal to a preset first number, discarding the symbol to eliminate the impulse noise.
5. The method of claim 4, wherein the method further comprises:
and if the number of the selected time domain signals is less than the preset first number and greater than or equal to the preset second number, setting the signal value of the time domain signal affected by the impulse noise in the symbol as a preset signal value so as to eliminate the impulse noise.
6. The method of claim 5, wherein the method further comprises:
if the number of the selected time domain signals is smaller than the preset second number, two time domain signals which are not influenced by impulse noise and are closest to any one time domain signal influenced by impulse noise in the symbol are obtained, the signal value of the time domain signal influenced by the impulse noise is estimated according to the obtained signal values of the two time domain signals, and the signal value of the time domain signal influenced by the impulse noise is set as the estimated signal value so as to eliminate the impulse noise.
7. An apparatus for canceling impulse noise, the apparatus comprising:
the acquisition module is used for periodically acquiring the carrier waves to acquire a time domain signal included in one period;
the first selection module is used for selecting a time domain signal of which the signal power is smaller than a preset power threshold value from the time domain signals included in the period;
the first calculation module is used for calculating the average power according to the signal power of the selected time domain signal;
and the first eliminating module is used for detecting and eliminating impulse noise from the time domain signal included in the period according to the average power.
8. The apparatus of claim 7, wherein the apparatus further comprises:
a second calculating module, configured to calculate, according to the signal value of each time-domain signal included in the one period, a signal power of each time-domain signal included in the one period respectively;
a second selecting module, configured to select a maximum signal power from signal powers of the time-domain signals included in the one period;
and the setting module is used for setting the power threshold according to the maximum signal power.
9. The apparatus of claim 8, wherein the setup module comprises:
the first setting unit is used for calculating the product of the maximum signal power and a preset coefficient, setting the product of the maximum signal power and the preset coefficient as the power threshold, and setting the product of the maximum signal power and the preset coefficient as the preset power threshold; or,
and the second setting unit is used for setting the maximum signal power as the power threshold, wherein the maximum signal power is the preset power threshold.
10. The apparatus of claim 7, wherein the first cancellation module comprises:
a determining unit, configured to determine a symbol in which each time domain signal included in the one period is located, respectively;
the detection unit is used for detecting and acquiring a time domain signal influenced by impulse noise in any symbol according to the average power;
a selecting unit, configured to select time domain signals with consecutive sequence numbers from the time domain signals affected by the impulse noise in the symbol, and count the number of the selected time domain signals;
and the elimination unit is used for discarding the symbol to eliminate the impulse noise if the number of the selected time domain signals is greater than or equal to a preset first number.
11. The apparatus of claim 10, wherein the apparatus further comprises:
and the second eliminating module is used for setting the signal value of the time domain signal affected by the impulse noise in the symbol as a preset signal value to eliminate the impulse noise if the number of the selected time domain signals is less than the preset first number and is greater than or equal to a preset second number.
12. The apparatus of claim 11, wherein the apparatus further comprises:
a third eliminating module, configured to, if the number of the selected time domain signals is smaller than the preset second number, obtain two time domain signals that are not affected by impulse noise and are closest to any one of the time domain signals affected by impulse noise in the symbol, estimate a signal value of the time domain signal affected by impulse noise according to the obtained signal values of the two time domain signals, and set the signal value of the time domain signal affected by impulse noise as the estimated signal value to eliminate impulse noise.
13. An apparatus for canceling impulse noise, the apparatus comprising a first memory and a first processor, configured to perform a method of canceling impulse noise according to any one of claims 1 to 6.
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