CN107026673A - The analog domain interference cancellation method and device of a kind of digital assistant - Google Patents
The analog domain interference cancellation method and device of a kind of digital assistant Download PDFInfo
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- H—ELECTRICITY
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- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
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Abstract
The invention discloses the analog domain interference cancellation method and device of a kind of digital assistant, this method includes signal transmitting, signal feedback, signal reconstruction and signal and receives four steps, using non-linear extraction unit estimation nonlinear parameter vector in signal feedback step, reconstructing digital transmission signal is calculated using non-linear reconstruction unit in signal reconstruction step；The device includes signal launching circuit, signal feedback loop, signal reconstruction loop and signal receiving circuit.This method can effectively suppress to launch the Nonlinear perturbations that radio-frequency channel is introduced, non-linear estimations and parameter adjustment can be easily carried out in numeric field, it can easily estimate to launch the multipath channel between radio-frequency channel and receiving RF channel in numeric field, and adjusting parameter, it is more conducive to expand to other application scene, robustness is stronger.
Description
Technical field
The present invention relates to radio art, the analog domain interference cancellation method and device of particularly a kind of digital assistant.
Background technology
Current wireless communication system carries out two-way communication using the method for time division duplex or FDD.Time division duplex system
System, using identical frequency, but different time-gap transmits data, so that the interference between isolating uplink downlink.FDD system
System, using identical time slot, but different frequency transmits data, so that the interference between isolating uplink downlink.Both duplexs
Method, during isolation uplink and downlink link, sacrifices time resource and frequency resource, causes the availability of frequency spectrum low respectively
Under.
Today's society increasingly increases wireless data service demand, and the spatial wireless channels degree of crowding is but more protruded, this
People are forced constantly to seek new method to improve frequency spectrum resource utilization rate and equipment interference free performance.If Wireless Telecom Equipment makes
Launched with same time, the full duplex technology of identical frequency and receive wireless signal, certainly this will cause radio communication
The spectrum efficiency of link is doubled.
However, the working method of co-channel full duplex is in same carrier frequency while transmitting is with receiving radio frequency letter simultaneously
Number.Therefore, transmission signal can also travel to receiving terminal, so as to form strong self-interference signal, jamming receiver analog-digital converter is led
Receiver is caused to receive useful signal, what the self-interference intensity was much better than that receiving terminal receives comes from remote wireless communications equipment
The intensity of signal, so as to have a strong impact on the reception that receiving terminal sends signal to far-end wireless device.Normal conditions, this will be reduced
The sensitivity of receiving terminal, increases the bit error rate, causes communication performance to decline；Under serious conditions, receiving terminal receiving channel will be blocked,
Cause receive capabilities to completely lose, or even burn receiver front end.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of analog domain Interference Cancellation side of digital assistant
Method and device, this method can effectively suppress to launch the Nonlinear perturbations that radio-frequency channel is introduced, and can easily enter in numeric field
Row non-linear estimations and parameter adjustment, can easily estimate between transmitting radio-frequency channel and receiving RF channel in numeric field
Multipath channel, and adjusting parameter, are more conducive to expand to other application scene, robustness is stronger.
The purpose of the present invention is achieved through the following technical solutions：A kind of analog domain Interference Cancellation side of digital assistant
Method, it includes signal transmitting, signal feedback, signal reconstruction and signal and receives four steps；
Described signal step of transmitting includes following sub-step：
S11：Signal to be transmitted carries out Digital Signal Processing by transmitting baseband unit and obtains data signal x [n], wherein n
Represent discrete time；
S12：Data signal x [n] is respectively fed to the first digital analog converter, non-linear extraction unit and non-linear reconstruction unit
In；
S13：The data signal x [n] for sending into the first digital analog converter is converted to radiofrequency signal x by transmitting radio-frequency channel
(t), wherein t represents continuous time；Radiofrequency signal x (t) is respectively fed to antenna element and feedback radio-frequency channel；
S14：The radiofrequency signal x (t) of feeding antenna element launches through antenna element；
Described signal feedback step includes following sub-step：
S21：Feed back radio-frequency channel and receive the radiofrequency signal x (t) for coming spontaneous emission radio-frequency channel, carry out after down coversion, filtering
It is sent to the first analog-digital converter and is converted to digital feedback signal xfb[n]；
S22:Digital feedback signal y [n] sends into non-linear extraction unit, believes with the output digital transmission of transmitting baseband unit
Number x [n], carries out time synchronized, power normalization operation, obtain it is equal on, power synchronous in time with x [n] (or very
Digital feedback signal y [n] approximately)；
S23:The nonlinear characteristic for launching radio-frequency channel is modeled with the memory polynomial model comprising even order terms,
Wherein the memory polynomial model comprising even order terms can be expressed as：
Wherein K represents the maximum non-linear exponent number of memory polynomial model, and Q represents the maximal memory of memory polynomial model
Depth, wkqRepresent nonlinear parameter of the memory polynomial model in kth rank q memory depths；
S24:When the both members of formula (1) take N group data to be arranged simultaneously, the matrix table of formula (1) can be obtained
Up to formula：
Y=XW (2)
WhereinDigital feedback signal y [n], n=0,1 are represented ..., N-1 compositions
Column vector, symbol T represent transposition operate；X represents the matrix that digital reflection signals x [n] composition dimensions are N × KQ, and it is defined
For：
X=[X0,X1,…,XN-1]T
Wherein
W represents the parameter vector of nonlinear parameter composition, is defined as：
W=[w00,…,wkq,…,w(K-1)(Q-1)]T
S25:Formula (2) is solved, nonlinear parameter vector W estimated result is calculated
S26:Non-linear extraction unit is by nonlinear parameter vector W estimated resultSend into non-linear reconstruction unit；
Described signal reconstruction step includes following sub-step：
S31：Non-linear reconstruction unit receives the data signal x [n] and non-linear extraction unit of transmitting baseband unit output
The estimated result of output, and signal x [n] is handled according to formula (3), obtain reconstructing digital transmission signal xtx[n], is represented
For：
Reconstructing digital transmission signal xtx[n] sends into channel reconstructing unit；
S32：Channel reconstructing unit obtains signal xtxThe output digital received signals r [n] of [n] and the second analog-digital converter,
To estimate to launch the multipath channel response h (t) between radio-frequency channel and receiving RF channel；Multipath channel response h (t) from
Dissipate estimated result h [n] and carry out convolution operation with reconstructing digital transmission signal, obtain digital reconstruction signal xtc[n], is used as channel weight
Build the output signal of unit；
S33：Digital reconstruction signal xtc[n] sends into the second digital analog converter, is converted to simulation reconstruction signal xtc(t)；
S34：Simulate reconstruction signal xtc(t) AF panel unit is sent into；
Described signal receiving step includes following sub-step：
S41：Reception signal s (t) from distal end enters AF panel unit by antenna element；
S42：AF panel unit subtracts each other it with radio frequency reconstruction signal z (t) after receiving signal s (t), to disappear
Except the analog receiving signal that low-frequency range is obtained after self-interference signal；
S44：Analog receiving signal, which is sent into after the second analog-to-digital conversion module, to be obtained receiving data signal s [n]；Receive numeral letter
Number s [n] obtains desired reception signal after receiving Base Band Unit processing.
Calculate nonlinear parameter vector W estimated resultMethod include least square method and iterative algorithm.
A kind of analog domain Interference Cancellation device of digital assistant, it includes signal launching circuit, signal feedback loop, signal
Rebuild loop and signal receiving circuit；
Described signal launching circuit includes transmitting baseband unit, the first digital analog converter, transmitting radio-frequency channel and antenna
Signal to be transmitted is carried out being transferred to the first digital analog converter after Digital Signal Processing, non-linear carried by unit, transmitting baseband unit
Unit and non-linear reconstruction unit are taken, the data signal process transmitting radio-frequency channel into the first digital analog converter is converted to radio frequency
Signal is launched through antenna element；
Described signal feedback loop includes feedback radio-frequency channel, the first analog-digital converter and non-linear extraction unit, instead
Feedback radio-frequency channel receive transmitting radio-frequency channel output radiofrequency signal it is downconverted and filtering after be transferred to the first analog-digital converter
Be converted to digital feedback signal and be transferred to non-linear extraction unit, non-linear extraction unit is by digital feedback signal and transmitting baseband
The data signal of unit output is handled, and obtains nonlinear parameter vector W estimated resultAnd it is single to send into non-linear reconstruction
Member；
Described signal reconstruction loop includes non-linear reconstruction unit, channel reconstructing unit, the second digital analog converter and again
Radio-frequency channel is built, what the data signal and non-linear extraction unit that non-linear reconstruction unit receives the output of transmitting baseband unit were exported
Estimated result calculates reconstructing digital transmission signal, and sends into channel reconstructing unit, and channel reconstructing unit obtains reconstructing digital transmitting
Signal and the digital received signals of the second analog-digital converter output calculate digital reconstruction signal and input the second digital analog converter, the
Digital reconstruction signal is converted to simulation reconstruction signal and is transferred to AF panel unit by two digital analog converters；
Described signal receiving circuit includes antenna element, AF panel unit, the second analog-digital converter and receives base band
Unit, the reception signal that antenna element is received is transferred to AF panel unit, and AF panel unit completes to incite somebody to action after AF panel
Analog receiving signal to low-frequency range sends into the second analog-to-digital conversion module, and the second analog-to-digital conversion module is converted to reception numeral letter
Reception Base Band Unit number is transferred to, desired reception signal is obtained after receiving Base Band Unit processing.
Described antenna element includes circulator and dual-mode antenna, the radiofrequency signal feeding annular of transmitting radio-frequency channel output
No. 1 port of device, then transmit to No. 2 ports output of circulator, and be sent to dual-mode antenna and launched；What dual-mode antenna was received
No. 2 ports that signal enters circulator are received, then AF panel unit are output to from No. 3 ports.
Described antenna element includes separate transmitting antenna and reception antenna, the radio frequency of transmitting radio-frequency channel output
Signal, which is transmitted to transmitting antenna, to be launched；The reception signal output that reception antenna is received is to AF panel unit.
Described AF panel unit includes rebuilding radiofrequency signal, radio frequency combiner and receiving RF channel, the second digital-to-analogue
Converter output simulation reconstruction signal is transferred to reconstruction radio-frequency channel, and radio frequency reconstruction signal is obtained simultaneously after rebuilding radio-frequency channel processing
Input radio frequency combiner, the reception signal that antenna element is received is transferred to radio frequency combiner, radio frequency combiner will receive signal with
Radio frequency reconstruction signal is exported after subtracting each other elimination self-interference signal, and the simulation that low-frequency range is obtained after receiving RF channel receives letter
Number feeding the second analog-to-digital conversion module.
Described AF panel unit includes combiner and receiving RF channel, the reception signal transmission that antenna element is received
To receiving RF channel, the analog receiving signal feeding combiner of low-frequency range is obtained after receiving RF channel processing, combiner will
Analog receiving signal and the second digital analog converter output simulation reconstruction signal are output to the second mould after subtracting each other elimination self-interference signal
Number modular converter.
The beneficial effects of the invention are as follows：The invention provides the Radio frequency interference counteracting method and device of a kind of digital assistant,
This method can effectively suppress to launch the Nonlinear perturbations that radio-frequency channel is introduced, and can easily carry out non-linear estimating in numeric field
Meter and parameter adjustment, can easily estimate to launch the multipath channel between radio-frequency channel and receiving RF channel in numeric field,
And adjusting parameter, it is more conducive to expand to other application scene, robustness is stronger.
Brief description of the drawings
Fig. 1 is the analog domain self-interference offset device block diagram of digital assistant；
Fig. 2 is the analog domain self-interference offset device embodiment one of digital assistant；
Fig. 3 is the analog domain self-interference offset device embodiment two of digital assistant；
Fig. 4 is the analog domain self-interference offset device embodiment three of digital assistant；
Fig. 5 is the analog domain self-interference offset device example IV of digital assistant.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to
It is as described below.
A kind of analog domain interference cancellation method of digital assistant, it includes signal transmitting, signal feedback, signal reconstruction and letter
Number receive four steps；
Described signal step of transmitting includes following sub-step：
S11：Signal to be transmitted carries out Digital Signal Processing by transmitting baseband unit and obtains data signal x [n], wherein n
Represent discrete time；
S12：Data signal x [n] is respectively fed to the first digital analog converter, non-linear extraction unit and non-linear reconstruction unit
In；
S13：The data signal x [n] for sending into the first digital analog converter is converted to radiofrequency signal x by transmitting radio-frequency channel
(t), wherein t represents continuous time；Radiofrequency signal x (t) is respectively fed to antenna element and feedback radio-frequency channel；
S14：The radiofrequency signal x (t) of feeding antenna element launches through antenna element；
Described signal feedback step includes following sub-step：
S21：Feed back radio-frequency channel and receive the radiofrequency signal x (t) for coming spontaneous emission radio-frequency channel, carry out after down coversion, filtering
It is sent to the first analog-digital converter and is converted to digital feedback signal xfb[n]；
S22:Digital feedback signal y [n] sends into non-linear extraction unit, believes with the output digital transmission of transmitting baseband unit
Number x [n], carries out time synchronized, power normalization operation, obtain it is equal on, power synchronous in time with x [n] (or very
Digital feedback signal y [n] approximately)；
S23:The nonlinear characteristic for launching radio-frequency channel is modeled with the memory polynomial model comprising even order terms,
Wherein the memory polynomial model comprising even order terms can be expressed as：
Wherein K represents the maximum non-linear exponent number of memory polynomial model, and Q represents the maximal memory of memory polynomial model
Depth, wkqRepresent nonlinear parameter of the memory polynomial model in kth rank q memory depths；
S24:When the both members of formula (1) take N group data to be arranged simultaneously, the matrix table of formula (1) can be obtained
Up to formula：
Y=XW (4)
WhereinDigital feedback signal y [n], n=0,1 are represented ..., N-1 compositions
Column vector, symbol T represent transposition operate；X represents the matrix that digital reflection signals x [n] composition dimensions are N × KQ, and it is defined
For：
X=[X0,X1,…,XN-1]T
Wherein
W represents the parameter vector of nonlinear parameter composition, is defined as：
W=[w00,…,wkq,…,w(K-1)(Q-1)]T
S25:Formula (2) is solved, nonlinear parameter vector W estimated result is calculatedComputational methods are included most
Small square law and iterative algorithm, use least square method can obtain parameter vector W least square solution for：
Wherein
Nonlinear parameter vector W estimated result is calculated using iterative algorithmMethod be
Wherein, k (n) is the gain vector at current time, and its expression formula is
ξ (n) is the prior estimate error at current time, and its expression formula is
In formula (6),
T (n)=P (n-1) Xn (8)
Wherein,
λ is the forgetting factor of iterative least square RLS algorithm, and value is 0~1 numerical value, and different values affect algorithm
Convergence rate, should be chosen according to actual needs.
Set in recursive algorithm initial phaseWith P (0)=I, priori is set during algorithm iteration
Evaluated error threshold value is compared with ξ (n), and parameter is completed when error ξ (n) is less than threshold valueCalculating.Come in this way
Power amplifier model of fit is set to reach different precision；
S26:Non-linear extraction unit is by nonlinear parameter vector W estimated resultSend into non-linear reconstruction unit；
Described signal reconstruction step includes following sub-step：
S31：Non-linear reconstruction unit receives the data signal x [n] and non-linear extraction unit of transmitting baseband unit output
The estimated result of output, and signal x [n] is handled according to formula (3), obtain reconstructing digital transmission signal xtx[n], is represented
For：
Reconstructing digital transmission signal xtx[n] sends into channel reconstructing unit；
S32：Channel reconstructing unit obtains signal xtxThe output digital received signals r [n] of [n] and the second analog-digital converter,
To estimate to launch the multipath channel response h (t) between radio-frequency channel and receiving RF channel；Multipath channel response h (t) from
Dissipate estimated result h [n] and carry out convolution operation with reconstructing digital transmission signal, obtain digital reconstruction signal xtc[n], is used as channel weight
Build the output signal of unit；
S33：Digital reconstruction signal xtc[n] sends into the second digital analog converter, is converted to simulation reconstruction signal xtc(t)；
S34：Simulate reconstruction signal xtc(t) AF panel unit is sent into；
Described signal receiving step includes following sub-step：
S41：Reception signal s (t) from distal end enters AF panel unit by antenna element；
S42：AF panel unit subtracts each other it with radio frequency reconstruction signal z (t) after receiving signal s (t), to disappear
Except the analog receiving signal that low-frequency range is obtained after self-interference signal；
S44：Analog receiving signal, which is sent into after the second analog-to-digital conversion module, to be obtained receiving data signal s [n]；Receive numeral letter
Number s [n] obtains desired reception signal after receiving Base Band Unit processing.
When antenna element be circulator and dual-mode antenna, radiofrequency signal x (t) feeding circulator No. 1 port transmit again to
No. 2 ports output of circulator, and be sent to dual-mode antenna and launched；Reception signal r (t) from distal end passes through dual-mode antenna
Into No. 2 ports of circulator, then AF panel unit is output to from No. 3 ports.Because circulator isolation is limited, radio frequency
Signal x (t) can be leaked to No. 3 ports, and enter receiving RF channel, form self-interference signal.Now the second digital-to-analogue conversion
Device output simulation reconstruction signal xtc(t) feeding rebuilds radio-frequency channel and obtains radio frequency reconstruction signal z (t), and sends into radio frequency combiner
In, radio frequency combiner receives signal r (t) and subtracted each other afterwards with radio frequency reconstruction signal z (t), to eliminate self-interference signal, penetrates
The analog receiving signal that the output of frequency combiner obtains low-frequency range after receiving RF channel sends into the second analog-to-digital conversion module.
When the output signal power of antenna element is in receiving RF channel within the tolerance range of power sensitive device, and
When can guarantee that receiving RF channel will not additionally introduce interference (non-linear distortion of such as low-noise amplifier) to the signal, interference
Suppress unit and only include combiner and receiving RF channel, the reception signal that antenna element is received is transferred to receiving RF channel,
Obtain the analog receiving signal feeding combiner of low-frequency range after receiving RF channel processing, combiner is by analog receiving signal and the
Two digital analog converters output simulation reconstruction signal is output to the second analog-to-digital conversion module after subtracting each other elimination self-interference signal.
As shown in figure 1, a kind of analog domain Interference Cancellation device of digital assistant, it is anti-that it includes signal launching circuit, signal
It is fed back to road, signal reconstruction loop and signal receiving circuit；
Described signal launching circuit includes transmitting baseband unit, the first digital analog converter, transmitting radio-frequency channel and antenna
Signal to be transmitted is carried out being transferred to the first digital analog converter after Digital Signal Processing, non-linear carried by unit, transmitting baseband unit
Unit and non-linear reconstruction unit are taken, the data signal process transmitting radio-frequency channel into the first digital analog converter is converted to radio frequency
Signal is launched through antenna element；
Described signal feedback loop includes feedback radio-frequency channel, the first analog-digital converter and non-linear extraction unit, instead
Feedback radio-frequency channel receive transmitting radio-frequency channel output radiofrequency signal it is downconverted and filtering after be transferred to the first analog-digital converter
Be converted to digital feedback signal and be transferred to non-linear extraction unit, non-linear extraction unit is by digital feedback signal and transmitting baseband
The data signal of unit output is handled, and obtains nonlinear parameter vector W estimated resultAnd send into non-linear reconstruction
Unit；
Described signal reconstruction loop includes non-linear reconstruction unit, channel reconstructing unit, the second digital analog converter and again
Radio-frequency channel is built, what the data signal and non-linear extraction unit that non-linear reconstruction unit receives the output of transmitting baseband unit were exported
Estimated result calculates reconstructing digital transmission signal, and sends into channel reconstructing unit, and channel reconstructing unit obtains reconstructing digital transmitting
Signal and the digital received signals of the second analog-digital converter output calculate digital reconstruction signal and input the second digital analog converter, the
Digital reconstruction signal is converted to simulation reconstruction signal and is transferred to AF panel unit by two digital analog converters；
Described signal receiving circuit includes antenna element, AF panel unit, the second analog-digital converter and receives base band
Unit, the reception signal that antenna element is received is transferred to AF panel unit, and AF panel unit completes to incite somebody to action after AF panel
Analog receiving signal to low-frequency range sends into the second analog-to-digital conversion module, and the second analog-to-digital conversion module is converted to reception numeral letter
Reception Base Band Unit number is transferred to, desired reception signal is obtained after receiving Base Band Unit processing.
As shown in Fig. 2 antenna element includes circulator and dual-mode antenna in one embodiment of the invention, launch radio frequency
The radiofrequency signal of passage output sends into No. 1 port of circulator, then transmits to No. 2 ports output of circulator, and is sent to transmitting-receiving
Antenna is launched；What dual-mode antenna was received receives No. 2 ports that signal enters circulator, is then output to from No. 3 ports dry
Disturb suppression unit.
As shown in figure 3, antenna element includes separate transmitting antenna and connect in another embodiment of the present invention
Antenna is received, radio signal transmission to the transmitting antenna of transmitting radio-frequency channel output is launched；The reception letter that reception antenna is received
Number it is output to AF panel unit.
As shown in figure 4, AF panel unit includes rebuilding radiofrequency signal, radio frequency in the third embodiment of the present invention
Combiner and receiving RF channel, the second digital analog converter output simulation reconstruction signal are transferred to reconstruction radio-frequency channel, and reconstruction is penetrated
Radio frequency reconstruction signal and input radio frequency combiner are obtained after the processing of frequency passage, the reception signal that antenna element is received is transferred to radio frequency
Combiner, radio frequency combiner will be received after signal subtracts each other elimination self-interference signal with radio frequency reconstruction signal and exported, and be penetrated by reception
The analog receiving signal that low-frequency range is obtained after frequency passage sends into the second analog-to-digital conversion module.
As shown in figure 5, AF panel unit includes combiner and receives radio frequency in the 4th kind of embodiment of the present invention
Passage, the reception signal that antenna element is received is transferred to receiving RF channel, and low-frequency range is obtained after receiving RF channel processing
Analog receiving signal sends into combiner, and analog receiving signal and the output of the second digital analog converter are simulated reconstruction signal phase by combiner
The second analog-to-digital conversion module is output to after subtracting elimination self-interference signal.
Claims (7)
1. a kind of analog domain interference cancellation method of digital assistant, it is characterised in that：It includes signal transmitting, signal feedback, letter
Number rebuild and signal receive four steps；
Described signal step of transmitting includes following sub-step：
S11：Signal to be transmitted carries out Digital Signal Processing by transmitting baseband unit and obtains data signal x [n], and wherein n is represented
Discrete time；
S12：Data signal x [n] is respectively fed in the first digital analog converter, non-linear extraction unit and non-linear reconstruction unit；
S13：The data signal x [n] for sending into the first digital analog converter is converted to radiofrequency signal x (t) by transmitting radio-frequency channel, its
Middle t represents continuous time；Radiofrequency signal x (t) is respectively fed to antenna element and feedback radio-frequency channel；
S14：The radiofrequency signal x (t) of feeding antenna element launches through antenna element；
Described signal feedback step includes following sub-step：
S21：Feed back radio-frequency channel and receive the radiofrequency signal x (t) for coming spontaneous emission radio-frequency channel, be sent to after carrying out down coversion, filtering
First analog-digital converter is converted to digital feedback signal xfb[n]；
S22:Digital feedback signal y [n] sends into non-linear extraction unit, the output digitally transmitted signals x with transmitting baseband unit
[n], carries out time synchronized, power normalization operation, obtains equal on, power synchronous in time with x [n] (or very near
Digital feedback signal y [n] seemingly)；
S23:The nonlinear characteristic for launching radio-frequency channel is modeled with the memory polynomial model comprising even order terms, wherein
Memory polynomial model comprising even order terms can be expressed as：
Wherein K represents the maximum non-linear exponent number of memory polynomial model, and Q represents that the maximal memory of memory polynomial model is deep
Degree, wkqRepresent nonlinear parameter of the memory polynomial model in kth rank q memory depths；
S24:When the both members of formula (1) take N group data to be arranged simultaneously, the matrix expression of formula (1) can be obtained：
Y=XW (2)
WhereinDigital feedback signal y [n], n=0,1 are represented ..., the row of N-1 compositions
Vector, symbol T represents that transposition is operated；X represents the matrix that digital reflection signals x [n] composition dimensions are N × KQ, and it is defined as：
X=[X0,X1,…,XN-1]T
Wherein
W represents the parameter vector of nonlinear parameter composition, is defined as：
W=[w00,…,wkq,…,w(K-1)(Q-1)]T
S25:Formula (2) is solved, nonlinear parameter vector W estimated result is calculated
S26:Non-linear extraction unit is by nonlinear parameter vector W estimated resultSend into non-linear reconstruction unit；
Described signal reconstruction step includes following sub-step：
S31：Non-linear reconstruction unit receives data signal x [n] and the output of non-linear extraction unit of transmitting baseband unit output
Estimated result, and signal x [n] is handled according to formula (3), obtains reconstructing digital transmission signal xtx[n], is expressed as：
Reconstructing digital transmission signal xtx[n] sends into channel reconstructing unit；
S32：Channel reconstructing unit obtains signal xtxThe output digital received signals r [n] of [n] and the second analog-digital converter, is used to
Multipath channel response h (t) between estimation transmitting radio-frequency channel and receiving RF channel；Multipath channel response h (t) discrete estimating
Count result h [n] and carry out convolution operation with reconstructing digital transmission signal, obtain digital reconstruction signal xtc[n], is used as channel reconstructing list
The output signal of member；
S33：Digital reconstruction signal xtc[n] sends into the second digital analog converter, is converted to simulation reconstruction signal xtc(t)；
S34：Simulate reconstruction signal xtc(t) AF panel unit is sent into；
Described signal receiving step includes following sub-step：
S41：Reception signal s (t) from distal end enters AF panel unit by antenna element；
S42：AF panel unit subtracts each other it with radio frequency reconstruction signal z (t) after receiving signal s (t), to eliminate certainly
The analog receiving signal of low-frequency range is obtained after interference signal；
S44：Analog receiving signal, which is sent into after the second analog-to-digital conversion module, to be obtained receiving data signal s [n]；Receive data signal s
[n] obtains desired reception signal after receiving Base Band Unit processing.
2. a kind of analog domain interference cancellation method of digital assistant according to claim 1, it is characterised in that：Calculate non-thread
Property parameter vector W estimated resultMethod include least square method and iterative algorithm.
3. the dress that a kind of analog domain interference cancellation method of digital assistant as described in any one in claim 1-2 is used
Put, it is characterised in that：It includes signal launching circuit, signal feedback loop, signal reconstruction loop and signal receiving circuit；
Described signal launching circuit includes transmitting baseband unit, the first digital analog converter, transmitting radio-frequency channel and antenna element,
Transmitting baseband unit is transferred to the first digital analog converter, non-linear extraction unit after signal to be transmitted is carried out into Digital Signal Processing
With non-linear reconstruction unit, the data signal process transmitting radio-frequency channel into the first digital analog converter is converted to radiofrequency signal warp
Antenna element is launched；
Described signal feedback loop includes feedback radio-frequency channel, the first analog-digital converter and non-linear extraction unit, and feedback is penetrated
Frequency channel reception transmitting radio-frequency channel output radiofrequency signal it is downconverted and filtering after be transferred to the first analog-digital converter conversion
Non-linear extraction unit is transferred to for digital feedback signal, and non-linear extraction unit is by digital feedback signal and transmitting baseband unit
The data signal of output is handled, and obtains nonlinear parameter vector W estimated resultAnd send into non-linear reconstruction unit；
Described signal reconstruction loop is penetrated including non-linear reconstruction unit, channel reconstructing unit, the second digital analog converter and reconstruction
Frequency passage, non-linear reconstruction unit receives the data signal of transmitting baseband unit output and the estimation of non-linear extraction unit output
As a result reconstructing digital transmission signal is calculated, and sends into channel reconstructing unit, channel reconstructing unit obtains reconstructing digital transmission signal
Digital reconstruction signal is calculated with the digital received signals that the second analog-digital converter is exported and inputs the second digital analog converter, the second number
Digital reconstruction signal is converted to simulation reconstruction signal and is transferred to AF panel unit by weighted-voltage D/A converter；
Described signal receiving circuit includes antenna element, AF panel unit, the second analog-digital converter and receives Base Band Unit,
The reception signal that antenna element is received is transferred to AF panel unit, and AF panel unit will obtain low frequency after completing AF panel
The analog receiving signal of section sends into the second analog-to-digital conversion module, and the second analog-to-digital conversion module is converted to reception digital data transmission
To Base Band Unit is received, desired reception signal is obtained after receiving Base Band Unit processing.
4. a kind of analog domain Interference Cancellation device of digital assistant according to claim 3, it is characterised in that：Described day
Line unit includes circulator and dual-mode antenna, and the radiofrequency signal of transmitting radio-frequency channel output sends into No. 1 port of circulator, then passes
No. 2 ports output of circulator is transported to, and is sent to dual-mode antenna and is launched；The reception signal that dual-mode antenna is received enters annular
No. 2 ports of device, are then output to AF panel unit from No. 3 ports.
5. a kind of analog domain Interference Cancellation device of digital assistant according to claim 3, it is characterised in that：Described day
Line unit includes separate transmitting antenna and reception antenna, and the radio signal transmission of transmitting radio-frequency channel output is to launching day
Line is launched；The reception signal output that reception antenna is received is to AF panel unit.
6. a kind of analog domain Interference Cancellation device of digital assistant according to claim 3, it is characterised in that：Described is dry
Disturbing suppression unit includes rebuilding radiofrequency signal, radio frequency combiner and receiving RF channel, the second digital analog converter output simulation weight
Build signal and be transferred to reconstruction radio-frequency channel, radio frequency reconstruction signal and input radio frequency combiner are obtained after rebuilding radio-frequency channel processing,
The reception signal that antenna element is received is transferred to radio frequency combiner, and radio frequency combiner subtracts each other signal is received with radio frequency reconstruction signal
Eliminate and exported after self-interference signal, the analog receiving signal that low-frequency range is obtained after receiving RF channel sends into the second modulus turn
Change the mold block.
7. a kind of analog domain Interference Cancellation device of digital assistant according to claim 3, it is characterised in that：Described is dry
Disturbing suppression unit includes combiner and receiving RF channel, and the reception signal that antenna element is received is transferred to receiving RF channel,
Obtain the analog receiving signal feeding combiner of low-frequency range after receiving RF channel processing, combiner is by analog receiving signal and the
Two digital analog converters output simulation reconstruction signal is output to the second analog-to-digital conversion module after subtracting each other elimination self-interference signal.
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