CN106685446B - Reversed self-excitation Interference Detection and removing method in TDD system - Google Patents
Reversed self-excitation Interference Detection and removing method in TDD system Download PDFInfo
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- CN106685446B CN106685446B CN201611052912.9A CN201611052912A CN106685446B CN 106685446 B CN106685446 B CN 106685446B CN 201611052912 A CN201611052912 A CN 201611052912A CN 106685446 B CN106685446 B CN 106685446B
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- frequency point
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- trapper
- excitation interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B2001/1063—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal using a notch filter
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Abstract
The invention belongs to wideband time division duplexing transceiver single-frequency point interference filtering technical fields, more particularly to self-excitation Interference Detection reversed in a kind of TDD system and removing method, compared with prior art, the present invention provides a set of practicable detection and removing method for self-excitation interference reversed in TDD system.Utilize the TDD switch control on reverse link, in the detection cycle of agreement, reversed self-excitation interference is detected, it finds out self-excitation interference frequency point and obtains the corresponding trapper coefficient of the frequency point by searching for trapper coefficient table, reverse signal is filtered, to eliminate reversed self-excitation interference, the signal quality of reverse link is improved.
Description
Technical field
The invention belongs to the interference of wideband time division duplexing (Time Division Duplexing, TDD) transceiver single-frequency point
Filter out technical field, and in particular to reversed self-excitation Interference Detection and removing method in a kind of TDD system, this method is using adaptive
Digital trap cooperates the TDD switch control on communication link, detects and eliminates reversed self-excitation interference, improve reverse strand
The signal quality on road.
Background technique
Nonlinear device is used on communication transceiver analog link, inevitably there is self-excitation phenomena, this self-excitation
Caused interference is usually the narrowband interference of single-frequency point, and the frequency point of self-excitation interference and amplitude all can be with time, environment etc.
Factor and change.If interference frequency point is fallen within the scope of baseband signal bandwidth, the resolving of reverse signal will be affected, be dropped
The performance of low receiver, resulting even in receiver can not work normally.
Summary of the invention
(1) technical problems to be solved
The technical problem to be solved by the present invention is to：How reversed self-excitation Interference Detection and elimination in a kind of TDD system are provided
Method.
(2) technical solution
In order to solve the above technical problems, the present invention provides reversed self-excitation Interference Detection and removing method in a kind of TDD system,
This method comprises the following steps：
Step 1：TDD system powers on, and after having configured system parameter, enables TDD and controls signal；The system parameter packet
It includes：Frequency point parameters, bandwidth parameter；
Step 2：Receive TDD control signal slot in, according to the detection cycle of agreement, when detecting between then, shutdown
Radio frequency link reversely receives the control switch SW-A of TDD control signal, complete in the uplink frame TDD control signal slot of shutdown
The detection of reversed self-excitation interference frequency point in pairs of TDD system；
Step 3：By carrying out FFT transform to uplink frame signal, the maximum frequency point of amplitude is found, and judge this frequency point width
Whether degree is greater than preset threshold value, if bin magnitudes are greater than predetermined threshold value, so that it may assert reversed self-excitation interference frequency point
In the presence of then whether relatively more current reversed self-excitation interference frequency point and last reversed self-excitation interference frequency point position are identical, such as identical
Then trapper coefficient remains unchanged, such as different, then according to TDD system, currently reversed self-excitation interference frequency point updates trapper coefficient,
To obtain newest trapper coefficient table；If bin magnitudes are not more than predetermined threshold value, decide that in TDD system and be not present
Frequency point is interfered in reversed self-excitation, then bypasses trapper module, uplink frame signal is directly fed to baseband processing module；
Step 4：The configuration of trapper coefficient is completed, after obtaining newest trapper coefficient table, in next uplink frame signal
In, the reversed self-excitation interference frequency point found out according to step 3 searches trapper coefficient table and obtains the corresponding trapper coefficient of the frequency point,
Uplink frame signal is filtered with the trapper coefficient using trapper, to eliminate reversed self-excitation interference；
Step 5：According to the detection cycle of agreement, judge whether to start self-excitation Interference Detection next time, if detection time
It arrives, then repeatedly step 2~step 4.
Wherein, the trapper coefficient table is：For the baseband signal of different bandwidth, institute has been stored in advance in TDD system
The corresponding trapper coefficient of possible interference frequency point, to constitute trapper coefficient table.
Wherein, the trapper is single order Notch filter, and time-domain expression is：Y (n)=α1y(n-1)+β0x(n)+
β1x(n-1)；Wherein α1、β0、β1It is trapper coefficient, by searching for the acquisition of trapper coefficient table.
(3) beneficial effect
Compared with prior art, the present invention provides a set of practicable for self-excitation interference reversed in TDD system
Detection and removing method.Using the TDD switch control on reverse link, in the detection cycle of agreement, reversed self-excitation is interfered
It is detected, find out self-excitation interference frequency point and obtains the corresponding trapper coefficient of the frequency point by searching for trapper coefficient table, it is right
Reverse signal is filtered, to eliminate reversed self-excitation interference, improves the signal quality of reverse link.
Detailed description of the invention
Fig. 1 is TDD system architecture diagram.
Fig. 2 is trapper coefficient table content schematic diagram.
Fig. 3 is the method for the present invention workflow schematic diagram.
Specific embodiment
To keep the purpose of the present invention, content and advantage clearer, with reference to the accompanying drawings and examples, to of the invention
Specific embodiment is described in further detail.
In order to solve the above technical problems, the present invention provides reversed self-excitation Interference Detection and removing method in a kind of TDD system,
As shown in Figures 1 and 3, this method comprises the following steps：
Step 1：TDD system powers on, and after having configured system parameter, enables TDD and controls signal；The system parameter packet
It includes：Frequency point parameters, bandwidth parameter；
Step 2：Receive TDD control signal slot in, according to the detection cycle of agreement, when detecting between then, shutdown
Radio frequency link reversely receives the control switch SW-A of TDD control signal, complete in the uplink frame TDD control signal slot of shutdown
The detection of reversed self-excitation interference frequency point in pairs of TDD system；
Step 3：By carrying out FFT transform to uplink frame signal, the maximum frequency point of amplitude is found, and judge this frequency point width
Whether degree is greater than preset threshold value, if bin magnitudes are greater than predetermined threshold value, so that it may assert reversed self-excitation interference frequency point
In the presence of then whether relatively more current reversed self-excitation interference frequency point and last reversed self-excitation interference frequency point position are identical, such as identical
Then trapper coefficient remains unchanged, such as different, then according to TDD system, currently reversed self-excitation interference frequency point updates trapper coefficient,
To obtain newest trapper coefficient table；If bin magnitudes are not more than predetermined threshold value, decide that in TDD system and be not present
Frequency point is interfered in reversed self-excitation, then bypasses trapper module, uplink frame signal is directly fed to baseband processing module；
Wherein, as shown in Fig. 2, the trapper coefficient table is：It is pre- in TDD system for the baseband signal of different bandwidth
The corresponding trapper coefficient of all possible interference frequency point is first stored, to constitute trapper coefficient table；
Step 4：The configuration of trapper coefficient is completed, after obtaining newest trapper coefficient table, in next uplink frame signal
In, the reversed self-excitation interference frequency point found out according to step 3 searches trapper coefficient table and obtains the corresponding trapper coefficient of the frequency point,
Uplink frame signal is filtered with the trapper coefficient using trapper, to eliminate reversed self-excitation interference；
Wherein, the trapper is single order Notch filter, and time-domain expression is：Y (n)=α1y(n-1)+β0x(n)+
β1x(n-1)；Wherein α1、β0、β1It is trapper coefficient, by searching for the acquisition of trapper coefficient table；
Step 5：According to the detection cycle of agreement, judge whether to start self-excitation Interference Detection next time, if detection time
It arrives, then repeatedly step 2~step 4.
To sum up, the present invention provides a set of practicable detection and elimination side for self-excitation interference reversed in TDD system
Method.Using the TDD switch control on reverse link, in the detection cycle of agreement, reversed self-excitation interference is detected, is found out
Self-excitation interference frequency point simultaneously obtains the corresponding trapper coefficient of the frequency point by searching for trapper coefficient table, filters to reverse signal
Wave processing improves the signal quality of reverse link to eliminate reversed self-excitation interference.
Wherein, used trapper is single order Notch filter, and time-domain expression is：Y (n)=α1y(n-1)+β0x
(n)+β1x(n-1).Wherein α1、β0、β1It is the coefficient of filter, for the baseband signal of different bandwidth, is stored in advance in system
All possible interference frequency point corresponding trapper coefficient constitutes trapper coefficient table.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (2)
1. reversed self-excitation Interference Detection and removing method in a kind of TDD system, which is characterized in that this method comprises the following steps：
Step 1：TDD system powers on, and after having configured system parameter, enables TDD and controls signal；The system parameter includes：Frequently
Point parameter, bandwidth parameter；
Step 2：Receive TDD control signal slot in, according to the detection cycle of agreement, when detecting between then, turn off radio frequency
Link reversal receives the control switch SW-A of TDD control signal, in the uplink frame TDD control signal slot of shutdown, completion pair
The detection of reversed self-excitation interference frequency point in TDD system；
Step 3：By carrying out FFT transform to uplink frame signal, the maximum frequency point of amplitude is found, and judge that this bin magnitudes is
It is no to be greater than preset threshold value, if bin magnitudes are greater than predetermined threshold value, so that it may assert that reversed self-excitation interference frequency point exists,
Then whether relatively more current reversed self-excitation interference frequency point and last reversed self-excitation interference frequency point position are identical, the trap if identical
Device coefficient remains unchanged, such as different, then according to TDD system, currently reversed self-excitation interference frequency point updates trapper coefficient, to obtain
Obtain newest trapper coefficient table；If bin magnitudes are not more than predetermined threshold value, decide that and be not present in TDD system reversely certainly
Swash interference frequency point, then bypasses trapper module, uplink frame signal is directly fed to baseband processing module；
Step 4：The configuration of trapper coefficient is completed, after obtaining newest trapper coefficient table, in next uplink frame signal, root
The reversed self-excitation interference frequency point found out according to step 3 searches trapper coefficient table and obtains the corresponding trapper coefficient of the frequency point, uses
Trapper is filtered uplink frame signal with the trapper coefficient, to eliminate reversed self-excitation interference；
Step 5：According to the detection cycle of agreement, judge whether to start self-excitation Interference Detection next time, if detection time arrives,
Repeat step 2~step 4.
2. reversed self-excitation Interference Detection and removing method in TDD system as described in claim 1, which is characterized in that described to fall into
Wave device coefficient table is：For the baseband signal of different bandwidth, it is corresponding that all possible interference frequency point has been stored in advance in TDD system
Trapper coefficient, to constitute trapper coefficient table.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611052912.9A CN106685446B (en) | 2016-11-25 | 2016-11-25 | Reversed self-excitation Interference Detection and removing method in TDD system |
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| CN201611052912.9A CN106685446B (en) | 2016-11-25 | 2016-11-25 | Reversed self-excitation Interference Detection and removing method in TDD system |
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| CN106685446B true CN106685446B (en) | 2018-11-27 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7573267B1 (en) * | 2008-01-19 | 2009-08-11 | General Electric Company | System and method for active MR tracking |
| CN103209016A (en) * | 2012-01-17 | 2013-07-17 | 深圳国人通信有限公司 | Repeater and power amplifier thereof |
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- 2016-11-25 CN CN201611052912.9A patent/CN106685446B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7573267B1 (en) * | 2008-01-19 | 2009-08-11 | General Electric Company | System and method for active MR tracking |
| CN103209016A (en) * | 2012-01-17 | 2013-07-17 | 深圳国人通信有限公司 | Repeater and power amplifier thereof |
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| CN106685446A (en) | 2017-05-17 |
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