CN106411336A - Terminal and interference elimination circuit and method thereof - Google Patents
Terminal and interference elimination circuit and method thereof Download PDFInfo
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- CN106411336A CN106411336A CN201610860045.5A CN201610860045A CN106411336A CN 106411336 A CN106411336 A CN 106411336A CN 201610860045 A CN201610860045 A CN 201610860045A CN 106411336 A CN106411336 A CN 106411336A
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- signal
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- interference
- main collection
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
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Abstract
The invention relates to a terminal and an interference elimination circuit and method thereof. The interference elimination circuit is applied to the terminal. The terminal comprises a master receiving path and a diversity receiving path. The interference elimination circuit comprises a signal synthesizing unit and a signal superposition unit, wherein the signal synthesizing unit is used for compensating and synthesizing a first path signal and/or a second path signal to generate a synthetic signal; and the signal superposition unit is used for performing interference offset processing on the synthetic signal to obtain an interference offset signal, and feeding the interference offset signal back to the master receiving path and/or the diversity receiving path, so that the interference offset signal and a master received signal and/or a diversity received signal are counteracted in order to eliminate interference in the master receiving path and/or the diversity receiving path. Through adoption of the interference elimination circuit and method, interference in the terminal can be eliminated effectively, so that the problem of severe EMC (Electro Magnetic Compatibility) in the terminal is solved.
Description
Technical field
It relates to mobile communication technology field, more particularly, to a kind of terminal and its interference cancellation circuit, interference eliminate
Method.
Background technology
With the progressively development of mobile communication technology, in terminal (such as smart mobile phone), integrated function gets more and more,
And the frequency range supported gets more and more so that the circuit structure of terminal inner also becomes increasingly complex.However, the space of the whole machine of terminal is
Limited, when this results in the work of terminal whole machine, the electromagnetic environment around main diversity antenna is increasingly complicated, if cannot be effectively
Eliminate the interference in terminal, terminal will be led to there is more serious EMC (Electro Magnetic Compatibility) problem, for example, terminal is some
During frequency range, antenna sensitivity drastically deteriorates, and affects Consumer's Experience.
At present, manufacturer terminal mainly has three kinds carrying out interference elimination method to terminal：The first, detecting interference
After source, by shielding measure, interference source is shielded as far as possible, to reduce the interference to disturbed object for the interference source；Second,
Cut-out interference path it is impossible to the produced interference of the terminal itself that is applied to, for example, do by harmonic wave produced by the Touch Screen of terminal
Disturb；The third, be protected by disturbed object by quarantine measures, to reduce the interference suffered by disturbed object.
But, or said method yet suffers from least a portion of interference leakage, and it is undesirable to cause interference with eradicating efficacy,
The scope of application is not wide, and all cannot ensure the concordance of radio performance of terminal index.Therefore, how effectively to eliminate in terminal
Interference is still manufacturer terminal problem demanding prompt solution now.
Content of the invention
Based on this, a purpose of the disclosure is to provide a kind of terminal and its interference cancellation circuit, existing for solving
Method is there is no effectively to eliminate the problem of interference in terminal in technology.
Additionally, another object of the present disclosure is to provide a kind of interference elimination method, for solving in prior art still
The problem of interference in terminal cannot effectively be eliminated.
In order to solve above-mentioned technical problem, the technical scheme that the disclosure is adopted is：
A kind of interference cancellation circuit, is applied to terminal, and described terminal includes main collection receiving path and diversity reception path, institute
State interference cancellation circuit and include signal synthesis unit and Signal averaging unit, wherein, described signal synthesis unit is used for first
Path signal and/or alternate path signal compensate synthesis after process, generate composite signal, described first path signal is logical
Cross and gather what the described main main collection receipt signal collecting receiving path transmission obtained, described alternate path signal is described by collection
The diversity reception signal of diversity reception tunnel obtains；Described Signal averaging unit is used for described composite signal is done
Disturb counteracting and process and obtain interference-cancelled signals, and feed back to described main collection receiving path and/or diversity reception path, make described dry
Disturb offseting signal to be offset with described main collection receipt signal and/or diversity reception signal, to eliminate described main collection receiving path
And/or disturb present in diversity reception path.
A kind of terminal, including main collection receiving path and diversity reception path, wherein, described terminal also includes as above
Interference Cancellation circuit, described Interference Cancellation is electrically connected between described main collection receiving path and diversity reception path.
A kind of interference elimination method, is applied to terminal, and described terminal includes main collection receiving path and diversity reception path, its
In, methods described includes：First path signal and/or alternate path signal are compensated with synthesis after process, generates synthesis letter
Number, described first path signal is to be obtained by the main collection receipt signal gathering described main collection receiving path transmission, described the
Two path signal are to be obtained by gathering the diversity reception signal of described diversity reception tunnel；Described composite signal is entered
Row interference-cancellation process obtains interference-cancelled signals；By described interference-cancelled signals feed back to described main collection receiving path and/or
Diversity reception path, makes described interference-cancelled signals be offset with described main collection receipt signal and/or diversity reception signal, with
Eliminate and disturb present in described main collection receiving path and/or diversity reception path.
Compared with prior art, the disclosure has the advantages that：
The disclosure has abandoned the mode of adopted to interference in terminal shielding in prior art or isolation, and novelty
Employ the mode of signal cancellation, by arranging Interference Cancellation between the main collection receiving path of terminal and diversity reception path
Circuit, is acquired using the signal that Interference Cancellation circuit is transmitted to main collection receiving path and diversity reception path, and processes
Obtain interference-cancelled signals, then feed back to main collection receiving path and diversity reception path is offset, thus effectively eliminating eventually
Interference in end, solves the problems, such as more serious EMC present in terminal, improves Consumer's Experience.
It should be appreciated that above general description and detailed description hereinafter are only exemplary and explanatory, not
The disclosure can be limited.
Brief description
Accompanying drawing herein is merged in description and constitutes the part of this specification, shows the enforcement meeting the disclosure
Example, and be used for together explaining the principle of the disclosure in description.
Fig. 1 is a kind of block diagram of the interference cancellation circuit according to an exemplary embodiment；
Fig. 2 be in the corresponding embodiment of Fig. 1 signal synthesis unit in the block diagram of an embodiment；
Fig. 3 be in the corresponding embodiment of Fig. 2 acquisition module in the block diagram of an embodiment；
Fig. 4 be in the corresponding embodiment of Fig. 1 Signal averaging unit in the block diagram of an embodiment；
Fig. 5 is the block diagram of another kind of interference cancellation circuit according to an exemplary embodiment；
Fig. 6 a is a kind of circuit theory diagrams of interference cancellation circuit in application scenarios；
Fig. 6 b is the circuit theory diagrams of another kind of interference cancellation circuit in application scenarios；
Fig. 7 is a kind of flow chart of the interference elimination method according to an exemplary embodiment；
Fig. 8 is a kind of hardware block diagram of the terminal according to an exemplary embodiment.
By above-mentioned accompanying drawing it has been shown that the clear and definite embodiment of the disclosure, hereinafter will be described in more detail, these accompanying drawings
It is not intended to limit the scope of disclosure design by any mode with word description, but by reference to specific embodiment be
Those skilled in the art illustrate the concept of the disclosure.
Specific embodiment
Here in detail explanation will be executed to exemplary embodiment, its example is illustrated in the accompanying drawings.Explained below is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the disclosure.On the contrary, they be only with such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, the disclosure.
Refer to Fig. 1, in one exemplary embodiment, a kind of interference cancellation circuit 100 is applied to terminal 10, and terminal 10 is wrapped
Include interference cancellation circuit 100, main collection receiving path 200, diversity reception path 300 and baseband processing unit 400.
Wherein, main collection receiving path 200 includes main collection antenna and its match circuit, and this match circuit can include filtering
Device, amplifier, converter etc..Main collection receiving path 200 is used for receiving radiofrequency signal by main collection antenna, and makes radiofrequency signal
Transmit to baseband processing unit 400 through corresponding match circuit.
Diversity reception path 300 includes diversity antenna and its match circuit, and this match circuit can include wave filter, amplification
Device, converter etc..Diversity reception path 300 is used for receiving radiofrequency signal by diversity antenna, and makes radiofrequency signal through correspondence
Match circuit transmit to baseband processing unit 400.
Baseband processing unit 400 is used for the radiofrequency signal (including main collection receipt signal and diversity reception signal) receiving
It is amplified and demodulate.
Because main collection antenna and diversity antenna all may be interfered the interference in source, therefore, in main collection receipt signal except
The radiofrequency signal including it is also possible to comprise useless and harmful radiofrequency signal, that is, is disturbed；In the same manner, in diversity reception signal
Except the radiofrequency signal including is it is also possible to comprise useless and harmful radiofrequency signal, that is, disturb.
In order to eliminate above-mentioned interference present in terminal 10, for example, persistently produce during baseband processing unit 400 work is dry
Disturb.Interference cancellation circuit 100 includes signal synthesis unit 110 and Signal averaging unit 130.
Specifically, signal synthesis unit 110 is used for compensating process to the first path signal and/or alternate path signal
After synthesize, generate composite signal.
First path signal is to be obtained by the main collection receipt signal gathering main collection receiving path 200 transmission, and second leads to
Road signal is to be obtained by gathering the diversity reception signal of diversity reception path 300 transmission.
After collecting the first path signal and alternate path signal, you can to the first path signal and/or second
Path signal compensates, to ensure the signal intensity phase of the first path signal after compensated process and alternate path signal
When.
Further, when the radiofrequency signal receiving is weak signal, to the first path signal and/or alternate path signal
Compensate.For example, receiving sensitivity threshold value is set to -90dBm, when the signal intensity of radiofrequency signal is less than -90dBm, should
Radiofrequency signal is considered weak signal.
If that is, main collection receiving path 200 transmission main collection receipt signal signal intensity do not meet reception sensitive
During degree threshold value, then the first path signal is compensated.In the same manner, if the diversity reception signal of diversity reception path 300 transmission
When signal intensity does not meet receiving sensitivity threshold value, then alternate path signal is compensated.
Further, compensating can be to carry out some multiples to the first path signal and/or alternate path signal to put
Greatly, can also be that carrying out some numerical value to the first path signal and/or alternate path signal adds up.
After completing to the first path signal and/or alternate path signal compensation, you can to first after compensation deals
Path signal and alternate path signal are synthesized.Further, synthesis can be the former with the latter is directly added it is also possible to
It is that the reverse signal of the former with the latter is added, can also be and the former with the latter is directly subtracted each other.
Signal averaging unit 130 obtains interference-cancelled signals for carrying out interference-cancellation process to composite signal, and feeds back
To main collection receiving path 200 and/or diversity reception path 300, interference-cancelled signals are made to connect with main collection receipt signal and/or diversity
The collection of letters number is offset, and is disturbed present in main collection receiving path 200 and/or diversity reception path 300 with eliminating.
After signal synthesis unit 110 generates composite signal, Signal averaging unit 130 can obtain this composite signal simultaneously
Interference-cancellation process is carried out to it.Further, interference-cancellation process refers to make the signal of the interference-cancelled signals of generation strong
Degree is suitable with the signal intensity of useless and harmful radiofrequency signal present in terminal, so that interference-cancelled signals and main collection
The useless and harmful radiofrequency signal comprising in receipt signal and/or diversity reception signal is offset, and reaches effective elimination eventually
The purpose of interference in end 10.
Further, counteracting can be carried out in main collection receiving path 200 and diversity reception path 300 simultaneously, also may be used
To be only to carry out in a path wherein.For example, if interference source, near main collection antenna, can be considered as diversity antenna not
Be interfered the interference in source, thus only needing to make interference-cancelled signals and the main collection of transmission in main collection receiving path 200 receive letter
Number offset, disturbed present in main collection receiving path 200 with eliminating.
By setting as above it is achieved that effectively eliminating interference in terminal so that solution in baseband processing unit
The sensitivity adjusting signal reaches optimum, thus solving the problems, such as more serious EMC present in terminal, effectively improves use
Family is experienced.
Refer to Fig. 2, in one exemplary embodiment, signal synthesis unit 110 includes acquisition module 111, first and amplifies
Module 113 and the first addition module 115.
Wherein, acquisition module 111 is connected with main collection receiving path 200 and diversity reception path 300 respectively, for gathering master
The main collection receipt signal of collection receiving path 200 transmission obtains the first path signal, and, collection diversity reception path 300 transmission
Diversity reception signal obtains alternate path signal.
Further, as shown in figure 3, acquisition module 111 includes the first power splitter 1111 and the second power splitter 1113.Each
Individual power splitter all includes input, the first outfan and the second outfan.
Specifically, the input of the first power splitter 1111 receives main collection receipt signal, and main collection receipt signal is divided two-way, its
In a road main collection receipt signal exported to the first addition module 115, Ling Yilu by the first outfan of the first power splitter 1111
The second outfan that main collection receipt signal passes through the first power splitter 1111 continues to transmit in main collection receiving path 200.
The input of the second power splitter 1113 receives diversity reception signal, and diversity reception signal is divided two-way, wherein one tunnel
Diversity reception signal is exported to the first amplification module 113 by the first outfan of the second power splitter 1113, and another road diversity connects
Number second outfan passing through the second power splitter 1113 of collecting mail continues to transmit in diversity reception path 300.
It is noted that main collection receipt signal and diversity reception signal are divided by the first power splitter 1111 and the second work(respectively
Device 1113 is divided into two-way, and so that the signal intensity of the transmission signal in winner's collection/diversity reception path 200,300 all can be reduced to
The half of the signal intensity of branch front signal, i.e. signal intensity attenuation 3dB, but because baseband processing unit 400 is to reception
To radiofrequency signal be demodulated process before, also can carry out synthesis process to this radiofrequency signal, therefore, above-mentioned power splitter is entered
The receipt signal branch of row can't produce any impact to the demodulation process of follow-up baseband processing unit 400.
First amplification module 113 is connected to acquisition module 111, for amplifying the first path signal and/or alternate path letter
Number.In the present embodiment, the first amplification module 113 is connected with the second power splitter 1113, for amplifying alternate path signal, such as Fig. 3
Shown.
Further, the first amplification module 113 includes the first amplifier, and the amplification of the first amplifier is controlled by terminal
10 baseband processing unit 400.
In the present embodiment, the signal intensity collecting receipt signal based on the amplification K setting of the first amplifier is connect with diversity
The ratio of the signal intensity of the collection of letters number.
This amplification K feeds back to the first amplifier after being calculated by baseband processing unit 400, and then passes through the first amplifier
Alternate path signal is amplified K times, for example, homophase amplifies K times or K times of anti-phase amplification, and second after ensureing to amplify with this is led to
The signal intensity of road signal is suitable with the signal intensity of the first path signal.Wherein, baseband processing unit 400 can be by demodulation
Thresholding and path gain subtraction calculations obtain the signal intensity of receipt signal, and then are calculated according to the signal intensity of receipt signal
To amplification K.
First addition module 115 is connected between acquisition module 111 and the first amplification module 113, leads to for being added first
Alternate path signal after road signal and amplification, obtains composite signal.
In the present embodiment, the first addition module 115 includes adder, and this adder is by after the first path signal and amplification
The reverse signal of alternate path signal is added.In other words, the additive process that this adder completes actually first leads to
The subtraction of the alternate path signal after road signal and amplification, and the alternate path signal after amplifying is reversely then by base band
Processing unit 400 controls the first amplifier to carry out what anti-phase amplification was realized.
Refer to Fig. 4, in one exemplary embodiment, Signal averaging unit 130 includes the second amplification module 131 and second
Addition module 133.
Wherein, the second amplification module 131 is connected between signal synthesis unit 110 and the second addition module 133, is used for putting
Big composite signal obtains interference-cancelled signals.
Further, the second amplification module 131 includes the second amplifier, and the amplification of the second amplifier is controlled by terminal
10 baseband processing unit 400.
As an example it is assumed that interference source is produced harmonic wave interference during the Touch Screen work of terminal, this interference source with
As a, the distance between itself and diversity antenna are b to main the distance between the antenna that integrates, then the signal strength expression of main collection receipt signal
For Io1=Ior1+a × Ioc, the signal strength expression of diversity reception signal is Io2=Ior2+b × Ioc.Wherein, Iori(i=
1,2) represent the signal intensity of useful radiofrequency signal, Ioc represents the signal intensity of useless and harmful radiofrequency signal.
In signal synthesis unit 110, the letter of the first path signal that the first outfan output through the first power splitter obtains
Number intensity is expressed as Io1 '=Ior1 '+a × Ioc ', the alternate path letter that the first outfan output through the second power splitter obtains
Number signal strength expression be Io2 '=Ior2 '+b × Ioc '.
After alternate path signal amplifies through the first amplifier, the signal strength expression of the alternate path signal after amplification is
KIo2 '=K (Ior2 '+b × Ioc ').Wherein, K=Io1 '/Io2 '.
Further, when the signal intensity of useless and harmful radiofrequency signal is strong much smaller than the signal of useful radiofrequency signal
When spending, K=Io1 '/Io2 ' ≈ Ior1 '/Ior2 '.Correspondingly, the signal intensity of the alternate path signal after amplification is then expressed as
KIo2 '=Ior1 '+Kb × Ioc '.
Phase is carried out to the reverse signal of the alternate path signal after the first path signal and amplification by the first addition module
Plus, obtain composite signal, the signal strength expression of this composite signal is Io1 '-KIo2 '=Ior1 '+a × Ioc '-(Ior1 '+Kb
× Ioc ')=(a-Kb) × Ioc '.
Because power splitter is for receipt signal is divided into the equal two paths of signals of energy, therefore, the of the first power splitter
The signal of the first path signal that the signal intensity of main collection receipt signal of two outfan outputs is exported with its first outfan is strong
Degree is consistent, is expressed as Io1 '=Ior1 '+a × Ioc '.In the same manner, the diversity reception letter of the second outfan output of the second power splitter
Number signal strength expression be Io2 '=Ior2 '+b × Ioc '.
Illustrated with Io1 '=Ior1 '+a × Ioc ' it will be understood that a × Ioc ' corresponding be useless and harmful penetrating
The signal intensity of frequency signal, after only effectively eliminating it, can only transmit useful radio frequency letter in main collection receiving path 200
Number, its corresponding signal intensity is Ior1 '.
Therefore, in the present embodiment, amplification C of the second amplifier is set to C=-a/ (a-Kb), and then makes synthesis
After the second amplifier amplifies, the signal strength expression obtaining interference-cancelled signals is C (a-Kb) × Ioc '=[- a/ to signal
(a-Kb)] × (a-Kb) × Ioc '=- a × Ioc ', collects useless and harmful radiofrequency signal in receiving path 200 with main just
Signal intensity a × Ioc ' opposite number each other.
This amplification C feeds back to the second amplifier after being calculated by baseband processing unit 400, and then passes through the second amplifier
Composite signal is amplified C times, collects useless in receiving path 200 with the signal intensity that this ensures the interference-cancelled signals obtaining with main
And the signal intensity of harmful radiofrequency signal is quite, thus realizing effective elimination of interference in main collection receiving path 200.
Wherein, baseband processing unit 400 carries out the scanning of different amplification C by controlling the second amplifier, to pass through
Exhaust algorithm is calculated this amplification C.
In the same manner, in diversity reception path 300, amplification C of the second amplifier is set to C=-b/ (a-Kb), remaining mistake
Consistent described by Cheng Yuzhu collection receiving path 200, will not be described here.
It should be noted that because, in main collection/diversity reception path 200,300, amplification C of the second amplifier corresponds to
Numerical value differ, therefore, two the second amplifiers can be set in the second amplification module 131, be respectively used to main collection receive logical
Road 200 and diversity reception path 300, now, the amplification to composite signal can be carried out simultaneously, thus being conducive to raising interference to disappear
The treatment effeciency removing.
Or, second amplifier, now, the amplification of composite signal can also be only set in the second amplification module 131
It is that timesharing completes, or that is, the baseband processing unit 400 of terminal 10 is logical by controlling this second amplifier to be only used for main collection reception
Road 200, or being only used for diversity reception path 300, reduces the circuit scale of the whole machine of terminal 10 with this, thus advantageously reducing end
The hardware power consumption at end 10.For example, baseband processing unit 400 passes through to control pin outputs level signals, if level signal is detected
For high level then it represents that the second amplifier is used for main collection receiving path 200, if conversely, level signal is detected is low level,
Represent the second amplifier for diversity reception path 300.
Second addition module 133 is connected with main collection receiving path 200 and diversity reception path 300 respectively, for disturbing
Offseting signal is added with main collection receipt signal and diversity reception signal respectively.
Wherein, the second addition module 133 can include two adders.One of adder is arranged at main collection and receives leads to
Road 200, for being added interference-cancelled signals and main collection receipt signal.Another adder is arranged at diversity reception path 300, uses
In addition interference-cancelled signals and diversity reception signal.Now, interference-cancelled signals can simultaneously with main collection receipt signal and divide
Collection receipt signal is added, thus being conducive to improving the treatment effeciency that interference eliminates.
Or, the second addition module 133 can also only include an adder, and this adder is controlled by the base band of terminal 10
Processing unit 400, or control adder to export interference-cancelled signals to main collection receiving path by baseband processing unit 400
200, or exporting to diversity reception path 300.Now, timesharing is connect by interference-cancelled signals with main collection receipt signal or diversity
The collection of letters number is added, and reduces the circuit scale of the whole machine of terminal 10 with this, thus advantageously reducing the hardware power consumption of terminal 10.For example,
Baseband processing unit 400 passes through to control pin outputs level signals, if level signal is detected is high level then it represents that interference is supported
The signal output that disappears to main collection receiving path 200, if conversely, level signal is detected is low level then it represents that interference-cancelled signals
Export to diversity reception path 300.
Further, as shown in figure 4, in one exemplary embodiment, Signal averaging unit 130 also includes switch module
135, it is connected between the second amplification module 131 and the second addition module 133.
Wherein, switch module 135 is used for controlling whether interference-cancelled signals collect receipt signal and diversity reception signal with main
It is added.Switch module 135 is controlled by the baseband processing unit 400 of terminal 10.
In the present embodiment, switch module 135 includes a single-pole double-throw switch (SPDT).Correspondingly, the second addition module 133 includes
Two adders, one of adder is arranged in main collection receiving path 200, and another adder is arranged on diversity reception and leads to
In road 300.
Between the adder that this single-pole double-throw switch (SPDT) is connected in the second amplification module 131 and main collection receiving path 200
During path, interference-cancelled signals are added with main collection receipt signal, disturb present in main collection receiving path 200 in order to eliminate.
Between the adder that this single-pole double-throw switch (SPDT) is connected in the second amplification module 131 and diversity reception path 300
During path, interference-cancelled signals are added with diversity reception signal, in order to eliminate interference present in diversity reception path 300.
Further, the connection of single-pole double-throw switch (SPDT) is controlled by baseband processing unit 400.For example, baseband processing unit 400
By controlling pin outputs level signals, if level signal is detected is high level then it represents that single-pole double-throw switch (SPDT) connects second
The path between adder in amplification module 131 and main collection receiving path 200, if conversely, level signal is detected is low electricity
Put down then it represents that leading between the adder in the second amplification module 131 and diversity reception path 300 connected by single-pole double-throw switch (SPDT)
Road.
Refer to Fig. 5, in one exemplary embodiment, interference cancellation circuit 100 also includes and signal synthesis unit 110
The by-pass unit 150 that input connects.
Wherein, by-pass unit 150 eliminates for whether control terminal 10 carries out interference.By-pass unit 150 is controlled by terminal
10 baseband processing unit 400.
Further, by-pass unit 150 can be made up of the components and parts or circuit with switching characteristic, for example, bypass
Unit 150 can be diode, audion, field-effect transistor, relay, single-pole double-throw switch (SPDT) etc..
For example, by-pass unit 150 includes single-pole double-throw switch (SPDT), and correspondingly, baseband processing unit 400 passes through to control hilted broadsword double
Throw switch on and off interference cancellation circuit, realizes whether terminal 10 carries out interference elimination.
Baseband processing unit 400 can control the connection of single-pole double-throw switch (SPDT) by controlling pin outputs level signals.
If level signal is detected for high level then it represents that terminal 10 needs to carry out interference elimination, now, single-pole double-throw switch (SPDT) is connected and is done
Disturb elimination circuit, if conversely, level signal is detected for low level then it represents that terminal 10 does not need to carry out interference elimination, now,
Single-pole double-throw switch (SPDT) turns off interference cancellation circuit.
Further, baseband processing unit 400 can be received with path gain subtraction calculations by demodulation threshold
The signal intensity of signal, and then receiving sensitivity is obtained according to the signal intensity calculating of receipt signal.If receiving sensitivity is normal,
Then enable bypass functionality, by-pass unit 150 control terminal 10 stops interference and eliminates, if conversely, receiving sensitivity is abnormal, enabling
Interference cancellation circuit 100, carries out interference and eliminates to terminal 10.
For example, during the Touch Screen work of terminal 10, receiving sensitivity can be led to occur relatively due to shielding bright going out with screen
Big difference, calculates the bright receiving sensitivity gone out under two states with screen of screen by baseband processing unit 400, if difference satisfaction property
Energy index, then enable bypass functionality, and by-pass unit 150 control terminal 10 stops interference and eliminates, if conversely, differing greatly, opening
With interference cancellation circuit 100, terminal 10 is carried out with interference and eliminates.
By setting as above it is achieved that interference cancellation circuit only just carries out interference when receiving sensitivity is abnormal disappears
Remove, significantly reduce the hardware power consumption of terminal.
It should be noted that the interference cancellation circuit that above-described embodiment is provided is when carrying out interference elimination, only with above-mentioned
The division of each functional module is illustrated, and in actual applications, can distribute above-mentioned functions by difference as desired
Functional module complete, that is, the internal structure of interference cancellation circuit will be divided into different functional modules, to complete above description
All or part of function.
Fig. 6 a to Fig. 6 b is the basic circuit diagram of the interference cancellation circuit in application scenarios, in conjunction with Fig. 6 a and Fig. 6 b couple
Interference cancellation circuit is illustrated as follows.
As shown in figures 6 a and 6b, the match circuit of main collection antenna includes receiving prime wave filter Z1, low-noise amplifier
(LNA) L1, reception rear class filtering device Z2, low-converter Q1 and low pass filter Z3, Z4.When not carrying out interference elimination, main collection
Antenna receive radiofrequency signal through each components and parts of its match circuit after, by output be amplified to baseband processing unit and
Demodulation.
The match circuit of diversity antenna includes receiving prime wave filter Z5, low-noise amplifier (LNA) L2, receives rear class filter
Ripple device Z6, low-converter Q2 and low pass filter Z7, Z8.When not carrying out interference elimination, the radiofrequency signal that diversity antenna receives
After each components and parts of its match circuit, output is amplified to baseband processing unit and demodulates.
Interference Cancellation circuit includes signal synthesis unit and Signal averaging unit.Signal synthesis unit include power splitter P1,
Power splitter P2, amplifier M1 and adder A1.Signal averaging unit includes amplifier M2, single-pole double-throw switch (SPDT) S1, adder A2
With adder A3.
Wherein, the input 1 of power splitter P1 and outfan 2 are arranged in main collection receiving path, the input 2 of adder A2
It is arranged in main collection receiving path with outfan 3, in the same manner, the input 1 of power splitter P2 and outfan 2 are arranged at diversity reception and lead to
Lu Zhong, the input 2 of adder A3 and outfan 3 are arranged in main collection receiving path.The output of interference-cancelled signals is then by list
Double-pole double throw switch S1 determines.
Interference Cancellation circuit also includes by-pass unit.Wherein, by-pass unit includes single-pole double-throw switch (SPDT) S2, S3, S4, S5.
When bypass functionality comes into force, power splitter P1 is bypassed by single-pole double-throw switch (SPDT) S2, S3, and single-pole double-throw switch (SPDT) S4, S5 are by by power splitter P2
Road, meanwhile, the input 1 of adder A1, A2 does not have signal input, and then makes winner's collection/diversity reception signal directly by receiving
Rear class filtering device Z2, Z6 transmit to low-converter Q1, Q2.
Following for method of disclosure embodiment, go for the interference cancellation circuit involved by the disclosure.For this public affairs
The details not disclosed in extraction of root embodiment, refer to the interference cancellation circuit embodiment involved by the disclosure.
Refer to Fig. 7, in one exemplary embodiment, a kind of interference elimination method is applied to the terminal 10 shown in Fig. 1, eventually
End 10 includes interference cancellation circuit 100, main collection receiving path 200 and diversity reception path 300.This interference cancellation circuit 100 is even
It is connected between main collection receiving path 200 and diversity reception path 300.
Correspondingly, this interference elimination method can be executed by interference cancellation circuit 100, may comprise steps of：
Step 710, compensates synthesis after process to the first path signal and/or alternate path signal, generates synthesis letter
Number.
Wherein, the first path signal is to be obtained by the main collection receipt signal gathering main collection receiving path transmission, second
Path signal is to be obtained by gathering the diversity reception signal of diversity reception tunnel.
Step 730, carries out interference-cancellation process to composite signal and obtains interference-cancelled signals.
Step 750, interference-cancelled signals is fed back to main collection receiving path and/or diversity reception path, makes Interference Cancellation
Signal is offset with main collection receipt signal and/or diversity reception signal, is led to eliminating main collection receiving path and/or diversity reception
Disturb present in road.
Refer to Fig. 8, Fig. 8 applies to a kind of hardware block diagram of terminal of interference elimination method.Need explanation
It is that this terminal 800 is that an example adapting to the disclosure there is provided appointing of range of this disclosure it is impossible to think
What limits.This terminal 800 nor be construed to need to rely on or must have the exemplary terminal 800 shown in Fig. 8
One of or multiple part.
As shown in figure 8, terminal 800 includes memorizer 801, storage control 803, one or more (in figure only illustrates one
Individual) processor 805, Peripheral Interface 807, radio-frequency module 809, locating module 811, photographing module 813, audio-frequency module 815, touch-control
Screen 817 and key-press module 819.These assemblies are mutually communicated by one or more communication bus/holding wire 821.
It is appreciated that the hardware configuration shown in Fig. 8 is only illustrating, terminal 800 may also include more more than shown in Fig. 8 or more
Few assembly, or there are the assemblies different from shown in Fig. 8.Each assembly shown in Fig. 8 can using hardware, software or its
Combine and to realize.
Wherein, memorizer 801 can be used for storing software program and module, the such as interference in disclosure exemplary embodiment
The corresponding programmed instruction of removing method and module, processor 805 passes through to run the programmed instruction being stored in memorizer 801, from
And execute various functions and data processing, that is, realize above-mentioned interference elimination method.
The carrier that memorizer 801 stores as resource, can be random storage medium, such as high speed random access memory, non-
Volatile memory, such as one or more magnetic storage devices, flash memory or other solid-state memory.Storage mode can be
Of short duration store or permanently store.
Peripheral Interface 807 can include at least one wired or wireless network interface, at least one connection in series-parallel translation interface, at least
One input/output interface and at least one USB interface etc., for being coupled to memorizer by outside various input/output devices
801 and processor 805, to realize the communication with outside various input/output devices.
Radio-frequency module 809 is used for transceiving electromagnetic ripple, realizes the mutual conversion of electromagnetic wave and the signal of telecommunication, thus passing through communication network
Network is communicated with other equipment.Communication network includes cellular telephone networks, WLAN or Metropolitan Area Network (MAN), above-mentioned communication network
Network can be using various communication standards, agreement and technology.
Locating module 811 is used for obtaining the geographical position being currently located of terminal 800.The example of locating module 811 includes
But it is not limited to GPS (GPS), the location technology based on WLAN or mobile radio communication.
Photographing module 813 is under the jurisdiction of photographic head, for shooting picture or video.The picture shooting or video can be deposited
Store up to memorizer 801, can also be sent to host computer by radio-frequency module 809.
Audio-frequency module 815 provides a user with audio interface, and it may include one or more microphone interfaces, one or more
Speaker interface and one or more earphone interface.Interacting of voice data is carried out with miscellaneous equipment by audio interface.Sound
Frequency, according to storing to memorizer 801, can also be sent by radio-frequency module 809.
Touch Screen 817 provides an I/O Interface between terminal 800 and user.Specifically, user can pass through
Touch Screen 817 carries out input operation, for example, the gesture operation such as click on, touch, sliding, so that electronic equipment is to this input operation
Responded.The output content that any one form of word, picture or video or combination are then formed by terminal 800 is passed through
Touch Screen 817 displays to the user that output.
Key-press module 819 includes at least one button, in order to the interface providing user to be inputted to terminal 800, user
Terminal 800 can be made to execute different functions by pressing different buttons.For example, sound regulating key be available for user realize right
The regulation of the wave volume that terminal 800 is play.
It should be noted that the interference elimination method that above-described embodiment is provided belongs to same with interference cancellation circuit embodiment
One design, the concrete executive mode of wherein each step has been described in detail in interference cancellation circuit embodiment, this
Place repeats no more.
The preferable examples embodiment of the above, the only disclosure, the embodiment being not intended to limit the disclosure, this
Field those of ordinary skill, according to the central scope of the disclosure and spirit, can very easily carry out flexible accordingly or repair
Change, therefore the protection domain of the disclosure should the protection domain required by by claims be defined.
Claims (10)
1. a kind of interference cancellation circuit, is applied to terminal, and described terminal includes main collection receiving path and diversity reception path, and it is special
Levy and be, described interference cancellation circuit includes signal synthesis unit and Signal averaging unit, wherein,
Described signal synthesis unit is used for the first path signal and/or alternate path signal are compensated with synthesis after process, raw
Become composite signal, described first path signal is to obtain by the main collection receipt signal gathering described main collection receiving path transmission
, described alternate path signal is to be obtained by gathering the diversity reception signal of described diversity reception tunnel；
Described Signal averaging unit obtains interference-cancelled signals for carrying out interference-cancellation process to described composite signal, and feeds back
To described main collection receiving path and/or diversity reception path, make described interference-cancelled signals and described main collection receipt signal and/or
Diversity reception signal is offset, and is disturbed present in described main collection receiving path and/or diversity reception path with eliminating.
2. circuit as claimed in claim 1 is it is characterised in that described signal synthesis unit includes acquisition module, the first amplification
Module and the first addition module, wherein,
Described acquisition module is connected with described main collection receiving path and diversity reception path respectively, receives for gathering described main collection
The main collection receipt signal of tunnel obtains described first path signal, and, gather the diversity of described diversity reception tunnel
Receipt signal obtains described alternate path signal；
Described first amplification module is connected to described acquisition module, for amplifying described alternate path signal；
Described first addition module is connected between described acquisition module and the first amplification module, for being added described first path
Alternate path signal after signal and amplification, obtains described composite signal.
3. circuit as claimed in claim 2 is it is characterised in that described acquisition module includes the first power splitter and the second work(divides
Device, each power splitter all includes input, the first outfan and the second outfan, wherein,
The input of the first power splitter receives described main collection receipt signal, and described main collection receipt signal is divided two-way, wherein one tunnel
Main collection receipt signal is exported to described first addition module by the first outfan of the first power splitter, and another road is main to collect reception letter
Number by the first power splitter second outfan continue described main collection receiving path in transmit；
The input of the second power splitter receives described diversity reception signal, and described diversity reception signal is divided two-way, wherein one tunnel
Diversity reception signal is exported to described first amplification module by the first outfan of the second power splitter, and the diversity reception of another road is believed
Number by the second power splitter second outfan continue in described diversity reception path transmit.
4. circuit as claimed in claim 2 is it is characterised in that described first amplification module includes the first amplifier, and described
The amplification of one amplifier is controlled by the baseband processing unit of described terminal.
5. circuit as claimed in claim 1 is it is characterised in that described Signal averaging unit includes the second amplification module and second
Addition module, wherein,
Described second amplification module is connected between described signal synthesis unit and the second addition module, for amplifying described synthesis
Signal obtains described interference-cancelled signals；
Described second addition module is connected with described main collection receiving path and diversity reception path respectively, for supporting described interference
The signal that disappears is added with main collection receipt signal and diversity reception signal respectively.
6. circuit as claimed in claim 5, it is characterised in that described Signal averaging unit also includes switch module, is connected to
Between described second amplification module and the second addition module, for controlling whether described interference-cancelled signals are received with described main collection
Signal is added with diversity reception signal, and described switch module is controlled by the baseband processing unit of described terminal.
7. circuit as claimed in claim 5 is it is characterised in that described second amplification module includes the second amplifier, and described
The amplification of two amplifiers is controlled by the baseband processing unit of described terminal.
8. the circuit described in claim 1 is it is characterised in that described interference cancellation circuit also includes and described signal synthesis unit
The by-pass unit that connects of input, eliminate for controlling described terminal whether to carry out interference, described by-pass unit is controlled by institute
State the baseband processing unit of terminal.
9. a kind of terminal, including main collection receiving path and diversity reception path it is characterised in that described terminal is also included as right
Require the Interference Cancellation circuit described in 1 to 8 any one, described Interference Cancellation is electrically connected to described main collection receiving path and diversity
Between receiving path.
10. a kind of interference elimination method, is applied to terminal, and described terminal includes main collection receiving path and diversity reception path, its
It is characterised by, methods described includes：
First path signal and/or alternate path signal are compensated with synthesis after process, generates composite signal, described first leads to
Road signal is to be obtained by the main collection receipt signal gathering described main collection receiving path transmission, and described alternate path signal is logical
Cross and gather what the diversity reception signal of described diversity reception tunnel obtained；
Interference-cancellation process is carried out to described composite signal and obtains interference-cancelled signals；
Described interference-cancelled signals are fed back to described main collection receiving path and/or diversity reception path, makes described Interference Cancellation
Signal is offset with described main collection receipt signal and/or diversity reception signal, to eliminate described main collection receiving path and/or to divide
Disturb present in collection receiving path.
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| CN201610860045.5A CN106411336B (en) | 2016-09-28 | 2016-09-28 | Terminal and its interference cancellation circuit, interference elimination method |
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| CN201610860045.5A CN106411336B (en) | 2016-09-28 | 2016-09-28 | Terminal and its interference cancellation circuit, interference elimination method |
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