CN103856423B - Communication terminal and self interference signal clearing method - Google Patents
Communication terminal and self interference signal clearing method Download PDFInfo
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- CN103856423B CN103856423B CN201210497246.5A CN201210497246A CN103856423B CN 103856423 B CN103856423 B CN 103856423B CN 201210497246 A CN201210497246 A CN 201210497246A CN 103856423 B CN103856423 B CN 103856423B
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Abstract
The present invention provides a kind of communication terminal and self interference signal clearing method,After the reception signal comprising remaining self-interference signal is converted to received IF signal by simulation process module,Received IF signal comprising remaining self-interference signal is transformed into numeric field by analog-to-digital conversion module from analog domain,Then digital interference cancellation module obtains primary signal of the digital modulation module in self-interference signal caused by intermediate frequency digital domain,And determine from the node of primary signal is obtained to the channel guess value of channel analog-to-digital conversion module output end,The offseting signal of remaining self-interference signal is obtained according to primary signal and channel guess value,Remaining self-interference signal is eliminated using offseting signal,Digital demodulating block is handled the received IF signal for eliminating remaining self-interference signal,It is achieved thereby that further Processing for removing is carried out to the remaining self-interference signal in the reception signal after simulation eliminates,Influence of the reduction self-interference signal of maximum possible to useful signal.
Description
Technical field
The present embodiments relate to communication technical field, more particularly to a kind of communication terminal and self-interference signal elimination side
Method.
Background technology
For two communication terminals at the same time with when being communicated frequently, the reception antenna of communication terminal can not only receive opposite end
The useful signal of transmission, it can also receive the signal of oneself transmission, as self-interference signal.And due to transmitting antenna and receive day
The distance of line is quite near, then the intensity of self-interference signal is often far above the useful signal of opposite end, so as to be caused to useful signal
Interference.
The method for solving the problems, such as self-interference at present is that communication terminal enters in analog domain to the self-interference signal in reception signal
Simulation of going eliminates, and still, simulation eliminates and carries certain frequency-selecting, i.e., some frequency bands elimination performances are fine, and other frequency band disappears
Except performance is relatively poor.Therefore, if system is a broadband system, after simulation eliminates, the different frequencies in whole bandwidth
Residual interference on rate point differs greatly, and is unfavorable for reducing useful signal.
The content of the invention
The embodiment of the present invention provides a kind of communication terminal and self interference signal clearing method, with to being followed by by simulation elimination
Remaining self-interference signal in the collection of letters number carries out further Processing for removing, and the reduction self-interference signal of maximum possible is to useful letter
Number influence.
In a first aspect, the embodiment of the present invention provides a kind of communication terminal, including：
Simulation process module, connect for the reception signal comprising remaining self-interference signal to be converted to intermediate frequency in analog domain
The collection of letters number, wherein, the remaining self-interference signal is the reception signal comprising self-interference signal by simulation interference cancellation module
The self-interference signal not being eliminated after processing；
One analog-to-digital conversion module, for the received IF signal comprising remaining self-interference signal to be transformed into from analog domain
Numeric field；
One digital interference cancellation module for being coupled to the analog-to-digital conversion module, for obtaining digital modulation module in
The primary signal of self-interference signal caused by frequency numeric field, and determine to the modulus to turn from the node for obtaining the primary signal
The channel guess value of transmission channel between mold changing block output end, the remnants are obtained according to the primary signal and the channel guess value
The offseting signal of self-interference signal, using the remnants in received IF signal of the offseting signal elimination by numeral conversion certainly
Interference signal；
One digital demodulating block for being coupled to the digital interference cancellation module, for eliminating remaining self-interference signal
Received IF signal carry out down-converted obtain baseband digital signal.
In the first possible implementation, the digital interference cancellation module is specifically used for：To the primary signal
Auto-correlation processing is carried out with the received IF signal comprising remaining self-interference signal, is obtained from the acquisition primary signal
Channel guess value of the node to transmission channel between the analog-to-digital conversion module output end.
With reference to the implementation of first aspect, in second of possible implementation, the digital modulation module includes：
The Digital Up Convert unit of signal is sent for carrying out upconversion process generation intermediate frequency to baseband digital signal, and for institute
State intermediate frequency and send the digital predistortion unit that signal carries out distortion compensation processing, wherein, the output of the Digital Up Convert unit
End is connected with the input of the digital predistortion unit, the node for obtaining the primary signal be located at described in numerically
The output end of converter unit, the primary signal are that intermediate frequency sends signal；
The digital interference cancellation module, specifically for from the output end of the Digital Up Convert unit to the modulus
Transmission channel between modular converter output end carries out linear channel valuation.
With reference to the implementation of first aspect, in the third possible implementation, the digital modulation module includes：
The Digital Up Convert unit of signal is sent for carrying out upconversion process generation intermediate frequency to baseband digital signal, and for institute
State intermediate frequency and send the digital predistortion unit that signal carries out distortion compensation processing, wherein, the output of the Digital Up Convert unit
End is connected with the input of the digital predistortion unit, and the node for obtaining the primary signal is pre- positioned at the numeral
The output end of distortion unit, the primary signal are that the intermediate frequency after distortion compensation sends signal；
The digital interference cancellation module, specifically for the output end from the digital predistortion unit to the modulus
Transmission channel between modular converter output end carries out nonlinear channel valuation.
With reference to the implementation of first aspect, in the 4th kind of possible implementation, the digital interference cancellation module
It is specifically used for：Counteracting using the negative value of the channel guess value and the product of the primary signal as the remaining self-interference signal
Signal, the offseting signal is added processing with the received IF signal comprising remaining self-interference signal and eliminated by numeral
Remaining self-interference signal in the received IF signal of conversion.
Second aspect, the embodiment of the present invention provide it is a kind of using above-mentioned first aspect provide communication terminal carried out from
Interfering signal removing method, including：
Reception signal comprising remaining self-interference signal is converted to intermediate frequency in analog domain and connect by the simulation process module
The collection of letters number, wherein, the remaining self-interference signal is the reception signal comprising self-interference signal by simulation interference cancellation module
The self-interference signal not being eliminated after processing；
Received IF signal comprising remaining self-interference signal is transformed into numeral by the analog-to-digital conversion module from analog domain
Domain；
The digital interference cancellation module obtains original of the digital modulation module in self-interference signal caused by intermediate frequency digital domain
Beginning signal, and determine from the node of the primary signal is obtained to the letter of transmission channel the analog-to-digital conversion module output end
Road valuation, the offseting signal of the remaining self-interference signal is obtained according to the primary signal and the channel guess value, utilizes institute
Offseting signal is stated to eliminate by the remaining self-interference signal in the digital received IF signal changed；
The digital demodulating block carries out down-converted acquisition to the received IF signal for eliminating remaining self-interference signal
Baseband digital signal.
It is described to determine to the modulus to turn from the node for obtaining the primary signal in the first possible implementation
The channel guess value of transmission channel specifically includes between mold changing block output end：
Auto-correlation processing is carried out to the primary signal and the received IF signal comprising remaining self-interference signal, obtained
Take from the node of the primary signal is obtained to the channel guess value of transmission channel the analog-to-digital conversion module output end.
With reference to the implementation of second aspect, in second of possible implementation, the digital modulation module includes：
The Digital Up Convert unit of signal is sent for carrying out upconversion process generation intermediate frequency to baseband digital signal, and for institute
State intermediate frequency and send the digital predistortion unit that signal carries out distortion compensation processing, wherein, the output of the Digital Up Convert unit
End is connected with the input of the digital predistortion unit, the node for obtaining the primary signal be located at described in numerically
The output end of converter unit, the primary signal are that intermediate frequency sends signal；
It is described to determine from the node of the acquisition primary signal to transmission channel the analog-to-digital conversion module output end
Channel guess value specifically include：
To from the output end of the Digital Up Convert unit to the transmission channel the analog-to-digital conversion module output end
Carry out linear channel valuation.
With reference to the implementation of second aspect, in the third possible implementation, the digital modulation module includes：
The Digital Up Convert unit of signal is sent for carrying out upconversion process generation intermediate frequency to baseband digital signal, and for institute
State intermediate frequency and send the digital predistortion unit that signal carries out distortion compensation processing, wherein, the output of the Digital Up Convert unit
End is connected with the input of the digital predistortion unit, and the node for obtaining the primary signal is pre- positioned at the numeral
The output end of distortion unit, the primary signal are that the intermediate frequency after distortion compensation sends signal；
It is described to determine from the node of the acquisition primary signal to transmission channel the analog-to-digital conversion module output end
Channel guess value specifically include：
To from the output end of the digital predistortion unit to the transmission channel the analog-to-digital conversion module output end
Carry out nonlinear channel valuation.
It is described according to the primary signal in the 4th kind of possible implementation with reference to the implementation of second aspect
The offseting signal of the remaining self-interference signal is obtained with the channel guess value, is eliminated using the offseting signal and turned by numeral
Remaining self-interference signal in the received IF signal changed specifically includes：
Counteracting using the negative value of the channel guess value and the product of the primary signal as the remaining self-interference signal
Signal, the offseting signal is added processing with the received IF signal comprising remaining self-interference signal and eliminated by numeral
Remaining self-interference signal in the received IF signal of conversion.
As shown from the above technical solution, communication terminal and self interference signal clearing method provided in an embodiment of the present invention, lead to
Cross after the reception signal comprising remaining self-interference signal is converted to received IF signal by simulation process module in analog domain, mould
Received IF signal comprising remaining self-interference signal is transformed into numeric field by number modular converter from analog domain, then digital interference
Cancellation module obtains primary signal of the digital modulation module in self-interference signal caused by intermediate frequency digital domain, and determines former from obtaining
The node of beginning signal to transmission channel between analog-to-digital conversion module output end channel guess value, according to primary signal and channel guess value
The offseting signal of remaining self-interference signal is obtained, is eliminated using offseting signal residual in the received IF signal by numeral conversion
Remaining self-interference signal, digital demodulating block carry out down-converted acquisition to the received IF signal for eliminating remaining self-interference signal
Baseband digital signal, it is achieved thereby that being carried out further to the remaining self-interference signal in the reception signal after simulation eliminates
Processing for removing, the influence of the reduction self-interference signal of maximum possible to useful signal.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of communication terminal one embodiment of the present invention；
The flow chart for the self interference signal clearing method embodiment that Fig. 2 is carried out by the communication terminal shown in application drawing 1；
Fig. 3 is the structural representation of another embodiment of communication terminal of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is the structural representation of communication terminal one embodiment of the present invention, as shown in figure 1, the communication terminal 1 includes：
Simulation process module 11, for the reception signal comprising remaining self-interference signal to be converted to medium frequency reception letter in analog domain
Number, wherein, remaining self-interference signal is the reception signal comprising self-interference signal after simulation interference cancellation module 12 is handled
The self-interference signal not being eliminated；One analog-to-digital conversion module 13, for the medium frequency reception for including remaining self-interference signal
Signal from analog domain is transformed into numeric field；One digital interference cancellation module 14 for being coupled to analog-to-digital conversion module 13, for obtaining
Digital modulation module 15 is taken in the primary signal of self-interference signal caused by intermediate frequency digital domain, and is determined from acquisition primary signal
Node obtains residual to the channel guess value of transmission channel between the output end of analog-to-digital conversion module 13 according to primary signal and channel guess value
The offseting signal of remaining self-interference signal, eliminated using offseting signal remaining from dry in the received IF signal by numeral conversion
Disturb signal；One digital demodulating block 16 for being coupled to digital interference cancellation module 14, for eliminating remaining self-interference signal
Received IF signal carry out down-converted obtain baseband digital signal.
Specifically, the stream for the self interference signal clearing method embodiment that Fig. 2 is carried out by the communication terminal shown in application drawing 1
Cheng Tu, this method specifically include：
Step 100, during simulation process module is converted to the reception signal comprising remaining self-interference signal in analog domain
Frequency reception signal, wherein, the remaining self-interference signal is that the reception signal comprising self-interference signal eliminates by simulation interference
The self-interference signal not being eliminated after resume module；
Communication terminal provided in an embodiment of the present invention is applied to a variety of communications network systems, including WCDMA
（Wideband Code Division Multiple Access, WCDMA）System, TD SDMA（Time
Division-Synchronous Code Division Multiple Access, TD-SCDMA）System, worldwide interoperability for microwave
(Worldwide Interoperability forMicrowave Access, the WiMax) system of access etc..Two communication terminals
Not only include the useful of opposite end transmission with the signal that when being communicated frequently, communication terminal is received by reception antenna at the same time
Signal, in addition to the self-interference signal oneself sent.In order to reduce influence of the self-interference signal to useful signal, communication terminal is first
First pass through simulation cancellation module and simulation Processing for removing is carried out to self-interference signal, after simulating Processing for removing, on some frequencies
Self-interference signal can be eliminated, but the self-interference signal on some frequencies be not eliminated as remaining self-interference believe
Number.Then the reception signal comprising remaining self-interference signal is changed in analog domain by the simulation process module of communication terminal
To be sent to analog-to-digital conversion module after received IF signal.
Step 101, analog-to-digital conversion module is transformed into the received IF signal comprising remaining self-interference signal from analog domain
Numeric field；
Because the processing before by simulating interference cancellation module eliminates a part of self-interference signal, so as to ensure
Useful signal will not be blocked when analog-to-digital conversion module carries out analog-to-digital conversion by remaining self-interference signal, therefore, analog-to-digital conversion
Module is sent to digital interference after the received IF signal comprising remaining self-interference signal is transformed into numeric field from analog domain and disappeared
Except module.
Step 102, digital interference cancellation module obtains digital modulation module in self-interference signal caused by intermediate frequency digital domain
Primary signal, and determine from the node of the primary signal is obtained to transmission channel the analog-to-digital conversion module output end
Channel guess value, the offseting signal of the remaining self-interference signal, profit are obtained according to the primary signal and the channel guess value
The remaining self-interference signal in the received IF signal by numeral conversion is eliminated with the offseting signal；
Digital interference cancellation module utilizes offseting signal to eliminate warp by obtaining the offseting signal of remaining self-interference signal
The remaining self-interference signal crossed in the received IF signal of numeral conversion, it is specially：Firstly, since current remaining self-interference letter
Number it is digital medium-frequency signal, and remaining self-interference signal refers to that communication terminal have received the letter of itself transmission by reception antenna
Number, the signal itself sent be exactly after simulation interference cancellation module, simulation process module and analog-to-digital conversion module it is remaining oneself
Interference signal, therefore, digital interference cancellation module obtain intermediate frequency caused by digital modulation module and send signal, i.e. digital interference disappears
Except module is in the primary signal of intermediate frequency digital domain acquisition self-interference signal.Then digital interference cancellation module determines original from obtaining
The node of signal to transmission channel between analog-to-digital conversion module output end channel guess value, and according to primary signal and channel guess value
The offseting signal of remaining self-interference signal is obtained, so as to be eliminated using offseting signal in the received IF signal by numeral conversion
Remaining self-interference signal.It is understood that those of ordinary skill in the art can utilize channel guess value of the prior art
Method carries out channel estimation to above-mentioned transmission channel, and specific channel guess value method includes：LMS channel estimation methods, LS letters
Channel estimation algorithm etc., because belonging to prior art, here is omitted.Remaining self-interference is obtained according to primary signal and channel guess value
The offseting signal of signal such as can specifically need to be multiplied to primary signal with channel guess value, weight the logic according to system application
Relational calculus obtains the offseting signal of remaining self-interference signal, is connect with the intermediate frequency balanced out using offseting signal by numeral conversion
Remaining self-interference signal in the collection of letters number, so as to reduce remaining self-interference signal to greatest extent, especially by simulation interference
Interference eliminates the remaining self-interference signal on poor frequency after Processing for removing.
Step 103, digital demodulating block carries out down-converted to the received IF signal for eliminating remaining self-interference signal
Obtain baseband digital signal.
Digital demodulating block obtains the intermediate frequency that Processing for removing is carried out to remaining self-interference signal from digital interference cancellation module
Reception signal, the useful signal in received IF signal now will not be influenceed by remaining self-interference signal, digital demodulation
Module carries out the base band number that down-converted obtains opposite end communication terminal to the received IF signal for eliminating remaining self-interference signal
Word signal is useful signal.
As shown from the above technical solution, communication terminal and self interference signal clearing method provided in an embodiment of the present invention, lead to
Cross after the reception signal comprising remaining self-interference signal is converted to received IF signal by simulation process module in analog domain, mould
Received IF signal comprising remaining self-interference signal is transformed into numeric field by number modular converter from analog domain, then digital interference
Cancellation module obtains primary signal of the digital modulation module in self-interference signal caused by intermediate frequency digital domain, and determines former from obtaining
The node of beginning signal to transmission channel between analog-to-digital conversion module output end channel guess value, according to primary signal and channel guess value
The offseting signal of remaining self-interference signal is obtained, is eliminated using offseting signal residual in the received IF signal by numeral conversion
Remaining self-interference signal, digital demodulating block carry out down-converted acquisition to the received IF signal for eliminating remaining self-interference signal
Baseband digital signal, it is achieved thereby that being carried out further to the remaining self-interference signal in the reception signal after simulation eliminates
Processing for removing, the influence of the reduction self-interference signal of maximum possible to useful signal.
How to determine to export to analog-to-digital conversion module from the node for obtaining primary signal for digital interference cancellation module 14
The channel guess value of transmission channel can use the above-mentioned LMS channel estimation methods referred to, LS channel estimation methods between end, or
Adaptive training method, it is preferable that digital interference cancellation module 14 determines channel guess value by relevant treatment, i.e. digital interference eliminates
Module 14 is specifically used for：To primary signal and the received IF signal comprising remaining self-interference signal carries out auto-correlation processing, obtains
Take from the node of primary signal is obtained to the channel guess value of transmission channel analog-to-digital conversion module output end.
How remaining self-interference signal obtained according to primary signal and channel guess value for digital interference cancellation module 14
Offseting signal, the logic that the remaining self-interference signal in the received IF signal by numeral conversion is eliminated using offseting signal are transported
Calculation method has a lot, and the mode of most simple optimizing is that digital interference cancellation module 14 is specifically used for channel guess value and original letter
Number product offseting signal of the negative value as remaining self-interference signal, by offseting signal with comprising in remaining self-interference signal
Frequency reception signal is added the remaining self-interference signal in received IF signal of the processing elimination by numeral conversion.
Node 16 for obtaining primary signal in the embodiment shown in Fig. 1, because primary signal refers to digital modulation mould
Block is sending signal caused by intermediate frequency digital domain, thus the position of node 16 can be included according to digital modulation module it is specific
Functional unit selects, it is not limited to and it is a kind of, illustrate below by the communication terminal structural representation shown in Fig. 3, have
Body is as follows：
Fig. 3 is the structural representation of another embodiment of communication terminal of the present invention, as shown in figure 3, based on implementation shown in Fig. 1
Example, digital modulation module 15 include：The numeral of signal is sent for carrying out upconversion process generation intermediate frequency to baseband digital signal
Up-conversion（Digital Up Converter, DUC）Unit 151, and for centering take place frequently the number of delivering letters carry out distortion compensation at
The digital pre-distortion of reason（Digital Pre-Distortio, DPD）Unit 152, wherein, the output of Digital Up Convert unit 151
End is connected with the input of digital predistortion unit 152.
The first implementation, when the output end that the node for obtaining primary signal is located at Digital Up Convert unit 151 is A
Point, primary signal are that intermediate frequency sends signal.Due to being that primary signal is obtained before DPD, it is necessary to model from number in this implementation
The output terminals A point of word upconverting unit 151 is to the transmission channel between the output end C points of analog-to-digital conversion module 13, the transmission channel
On due to by DPD to the power amplifier of the transmitting terminal of communication terminal caused by channel distortion corrected, channel is basic
It is approximately linear characteristic, digital interference cancellation module 14 is specifically used for the output terminals A point from Digital Up Convert unit 151 to mould
Transmission channel between the number output end C points of modular converter 13 carries out linear channel valuation, and specific linear channel estimation can lead to
Cross training or adaptive mode is realized.The major advantage of the implementation is that Channel Modeling is simple, and shortcoming is worked by DPD
State change, high is required to the ability of tracking of adaptive algorithm or need to consider DPD carrys out project training sequence.Need to illustrate
, Fig. 3 is in order to clearly demonstrate the process that the transmission signal of communication terminal itself is transformed into remaining self-interference signal, schematically
The transmitting processing module for showing to include power amplifier, the transmitting processing module only identifies the mould that the present embodiment is related to
Block, remaining module not identified and unit and the inventive point of non-invention or the module arrived being related to.
Second of implementation, when the output end that the node for obtaining primary signal is located at digital predistortion unit 152 is B
Point, primary signal are that the intermediate frequency after distortion compensation sends signal.Due to being that primary signal is obtained after DPD in this implementation,
Modeling is needed from the output end B points of digital predistortion unit 152 to the transmission letter the output end C points of analog-to-digital conversion module 13
Road, the channel distortion caused by by the power amplifier of the transmitting terminal of communication terminal on the transmission channel, channel are non-thread
Property characteristic, digital interference cancellation module 14 be specifically used for from the output end B points of digital predistortion unit 152 to analog-to-digital conversion mould
Transmission channel between the output end C points of block 13 carries out nonlinear channel valuation, and specific nonlinear channel estimation can pass through instruction
Experienced or adaptive mode is realized.The major advantage of the implementation is not changed to be influenceed by DPD working conditions, and shortcoming is
Nonlinear channel algorithm for estimating is complicated.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can pass through
Programmed instruction related hardware is completed, and foregoing program can be stored in a computer read/write memory medium, the program
Upon execution, the step of execution includes above method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or light
Disk etc. is various can be with the medium of store program codes.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (8)
- A kind of 1. communication terminal, it is characterised in that including：Simulation process module, for the reception signal comprising remaining self-interference signal to be converted to medium frequency reception letter in analog domain Number, wherein, the remaining self-interference signal is the reception signal comprising self-interference signal by simulation interference cancellation module processing The self-interference signal not being eliminated afterwards；One analog-to-digital conversion module, for the received IF signal comprising remaining self-interference signal to be transformed into numeral from analog domain Domain；One digital interference cancellation module for being coupled to the analog-to-digital conversion module, for obtaining digital modulation module in middle frequency The primary signal of self-interference signal caused by word domain, and determine from the node of the acquisition primary signal to the analog-to-digital conversion mould The channel guess value of transmission channel between block output end, obtained according to the primary signal and the channel guess value described remaining from dry The offseting signal of signal is disturbed, the remaining self-interference in the received IF signal by numeral conversion is eliminated using the offseting signal Signal；One digital demodulating block for being coupled to the digital interference cancellation module, for eliminating in remaining self-interference signal Frequency reception signal carries out down-converted and obtains baseband digital signal；The digital interference cancellation module is specifically used for：To the primary signal and the intermediate frequency for including remaining self-interference signal Reception signal carries out auto-correlation processing, obtains from the node of the acquisition primary signal to the analog-to-digital conversion module output end it Between transmission channel channel guess value；The digital modulation module includes：The number of signal is sent for carrying out upconversion process generation intermediate frequency to baseband digital signal Word upconverting unit, and the digital predistortion unit for carrying out distortion compensation processing for sending signal to the intermediate frequency, wherein, The output end of the Digital Up Convert unit is connected with the input of the digital predistortion unit.
- 2. communication terminal according to claim 1, it is characterised in that the node for obtaining the primary signal is located at institute The output end of Digital Up Convert unit is stated, the primary signal is that intermediate frequency sends signal；The digital interference cancellation module, specifically for from the output end of the Digital Up Convert unit to the analog-to-digital conversion Transmission channel between module output end carries out linear channel valuation.
- 3. communication terminal according to claim 1, it is characterised in that the node for obtaining the primary signal is located at institute The output end of digital predistortion unit is stated, the primary signal is that the intermediate frequency after distortion compensation sends signal；The digital interference cancellation module, specifically for the output end from the digital predistortion unit to the analog-to-digital conversion Transmission channel between module output end carries out nonlinear channel valuation.
- 4. according to any described communication terminals of claim 1-3, it is characterised in thatThe digital interference cancellation module is specifically used for：Using the negative value of the channel guess value and the product of the primary signal as The offseting signal of the remaining self-interference signal, by the offseting signal and the medium frequency reception for including remaining self-interference signal Signal is added the remaining self-interference signal in received IF signal of the processing elimination by numeral conversion.
- A kind of 5. self interference signal clearing method for applying communication terminal as claimed in claim 1 to be carried out, it is characterised in that Methods described includes：Reception signal comprising remaining self-interference signal is converted to medium frequency reception letter by the simulation process module in analog domain Number, wherein, the remaining self-interference signal is the reception signal comprising self-interference signal by simulation interference cancellation module processing The self-interference signal not being eliminated afterwards；Received IF signal comprising remaining self-interference signal is transformed into numeric field by the analog-to-digital conversion module from analog domain；The digital interference cancellation module obtains original letter of the digital modulation module in self-interference signal caused by intermediate frequency digital domain Number, and the channel determined from the node to the transmission channel the analog-to-digital conversion module output end that obtain the primary signal is estimated Value, the offseting signal of the remaining self-interference signal is obtained according to the primary signal and the channel guess value, is supported using described The signal that disappears eliminates the remaining self-interference signal in the received IF signal by numeral conversion；The digital demodulating block carries out down-converted to the received IF signal for eliminating remaining self-interference signal and obtains base band Data signal；It is described to determine from the node of the primary signal is obtained to the letter of transmission channel the analog-to-digital conversion module output end Road valuation specifically includes：Auto-correlation processing is carried out to the primary signal and the received IF signal comprising remaining self-interference signal, obtain from The node of the primary signal is obtained to the channel guess value of transmission channel between the analog-to-digital conversion module output end；The Digital Up Convert unit carries out upconversion process generation intermediate frequency to baseband digital signal and sends signal；The digital predistortion unit sends signal to the intermediate frequency and carries out distortion compensation processing.
- 6. self interference signal clearing method according to claim 5, it is characterised in that the acquisition primary signal Node is located at the output end of the Digital Up Convert unit, and the primary signal is that intermediate frequency sends signal；It is described to determine from the node of the primary signal is obtained to the letter of transmission channel the analog-to-digital conversion module output end Road valuation specifically includes：To being carried out from the output end of the Digital Up Convert unit to the transmission channel the analog-to-digital conversion module output end Linear channel valuation.
- 7. self interference signal clearing method according to claim 5, it is characterised in that the acquisition primary signal Node is located at the output end of the digital predistortion unit, and the primary signal is that the intermediate frequency after distortion compensation sends signal；It is described to determine from the node of the primary signal is obtained to the letter of transmission channel the analog-to-digital conversion module output end Road valuation specifically includes：To being carried out from the output end of the digital predistortion unit to the transmission channel the analog-to-digital conversion module output end Nonlinear channel valuation.
- 8. according to any described self interference signal clearing methods of claim 5-7, it is characterised in thatThe offseting signal that the remaining self-interference signal is obtained according to the primary signal and the channel guess value, utilizes institute The remaining self-interference signal that offseting signal is eliminated in the received IF signal by numeral conversion is stated to specifically include：Offseting signal using the negative value of the channel guess value and the product of the primary signal as the remaining self-interference signal, The offseting signal is added into processing with the received IF signal comprising remaining self-interference signal to eliminate by numeral conversion Received IF signal in remaining self-interference signal.
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| CN201210497246.5A CN103856423B (en) | 2012-11-29 | 2012-11-29 | Communication terminal and self interference signal clearing method |
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| CN201210497246.5A CN103856423B (en) | 2012-11-29 | 2012-11-29 | Communication terminal and self interference signal clearing method |
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| WO2020093332A1 (en) * | 2018-11-08 | 2020-05-14 | 华为技术有限公司 | Method, device and system for interference elimination |
| CN110731053B (en) * | 2019-04-29 | 2020-12-11 | Oppo广东移动通信有限公司 | Self-interference estimation method and terminal equipment |
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| CN101359956A (en) * | 2008-09-12 | 2009-02-04 | 北京创毅视讯科技有限公司 | Repeater |
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| CN101359956A (en) * | 2008-09-12 | 2009-02-04 | 北京创毅视讯科技有限公司 | Repeater |
| CN101409581A (en) * | 2008-11-07 | 2009-04-15 | 武汉虹信通信技术有限责任公司 | Apparatus and method for reducing wireless discharging-directly station antenna insulated degree requirement |
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