CN103856423A - Communication terminal and self interference signal elimination method - Google Patents
Communication terminal and self interference signal elimination method Download PDFInfo
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- CN103856423A CN103856423A CN201210497246.5A CN201210497246A CN103856423A CN 103856423 A CN103856423 A CN 103856423A CN 201210497246 A CN201210497246 A CN 201210497246A CN 103856423 A CN103856423 A CN 103856423A
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Abstract
The invention provides a communication terminal and a self interference signal elimination method. The method comprises: after receiving signals comprising residual self interference signals are converted to intermediate frequency receiving signals through a simulation processing module, an analog-to-digital conversion module converting the intermediate frequency receiving signals comprising the residual self interference signals from an analog domain to a digit domain; then a digit interference elimination module obtaining the original signals of the self interference signals generated in an intermediate frequency digit domain by a digit modulation module, determining the channel estimation value of a channel between the nodes of the original signals and the output end of the analog-to-digital conversion module, according to the original signals and the channel estimation values, obtaining the offset signals of the residual self interference signals, and eliminating the residual self interference signals by use of the offset signals; and a digit demodulation module processing the intermediate frequency receiving signals whose residual self interference signals are eliminated, such that the residual self interference signals in the receiving signals after simulation elimination can be further eliminated and processed, thus the influences exerted by the residual self interference signals on useful signals are reduced to the maximum.
Description
Technical field
The embodiment of the present invention relates to communication technical field, relates in particular to a kind of communication terminal and self interference signal clearing method.
Background technology
When two communication terminals carry out communication with frequency at the same time, the reception antenna of communication terminal not only can receive the useful signal that opposite end sends, and also can receive the signal that oneself sends, and is self-interference signal.And because the distance of transmitting antenna and reception antenna is quite near, the intensity of self-interference signal is often far above the useful signal of opposite end, thereby useful signal is caused to interference.
The method that solves at present self-interference problem is communication terminal at analog domain, and the self-interference signal in is to received signal simulated elimination, but, simulation is eliminated with certain frequency-selecting, and it is fine that some frequency band is eliminated performance, and it is relatively poor that other frequency band is eliminated performance.Therefore,, if system is a broadband system, after simulation is eliminated, the residual interference on the different frequency point in whole bandwidth differs greatly, and is unfavorable for reducing useful signal.
Summary of the invention
The embodiment of the present invention provides a kind of communication terminal and self interference signal clearing method, so that the remaining self-interference signal receiving in signal after simulation is eliminated is carried out to Processing for removing further, the impact of the minimizing self-interference signal of maximum possible on useful signal.
First aspect, the embodiment of the present invention provides a kind of communication terminal, comprising:
Simulation process module, for the reception signal that comprises remaining self-interference signal being converted to received IF signal at analog domain, wherein, described remaining self-interference signal is the self-interference signal that the reception signal that comprises self-interference signal is not eliminated after simulation interference cancellation module is processed;
An analog-to-digital conversion module, for being transformed into numeric field the received IF signal that comprises remaining self-interference signal from analog domain;
One is coupled to the digital interference cancellation module of described analog-to-digital conversion module, for obtaining the primary signal of digital modulation module at the self-interference signal of intermediate frequency numeric field generation, and determine from obtaining the node of described primary signal to the channel guess value of transmission channel described analog-to-digital conversion module output, obtain the offseting signal of described remaining self-interference signal according to described primary signal and described channel guess value, utilize described offseting signal to eliminate through the remaining self-interference signal in the received IF signal of digital translation;
One is coupled to the digital demodulation module of described digital interference cancellation module, obtains baseband digital signal for the received IF signal of eliminating remaining self-interference signal is carried out to down-converted.
In the possible implementation of the first, described digital interference cancellation module specifically for: to described primary signal and described in comprise remaining self-interference signal received IF signal carry out auto-correlation processing, obtain node from the obtaining described primary signal channel guess value to transmission channel described analog-to-digital conversion module output.
In conjunction with the implementation of first aspect, in the possible implementation of the second, described digital modulation module comprises: the Digital Up Convert unit that generates intermediate frequency transmitted signal for baseband digital signal being carried out to upconversion process, and for described intermediate frequency transmitted signal being carried out to the digital pre-distortion unit of distortion compensation processing, wherein, the output of described Digital Up Convert unit is connected with the input of described digital pre-distortion unit, the described node that obtains described primary signal is positioned at the output of described Digital Up Convert unit, described primary signal is intermediate frequency transmitted signal,
Described digital interference cancellation module, carries out linear channel valuation specifically for the output to from described Digital Up Convert unit to the transmission channel described analog-to-digital conversion module output.
In conjunction with the implementation of first aspect, in the third possible implementation, described digital modulation module comprises: the Digital Up Convert unit that generates intermediate frequency transmitted signal for baseband digital signal being carried out to upconversion process, and for described intermediate frequency transmitted signal being carried out to the digital pre-distortion unit of distortion compensation processing, wherein, the output of described Digital Up Convert unit is connected with the input of described digital pre-distortion unit, the described node that obtains described primary signal is positioned at the output of described digital pre-distortion unit, described primary signal is the intermediate frequency transmitted signal after distortion compensation,
Described digital interference cancellation module, carries out nonlinear channel valuation specifically for the output to from described digital pre-distortion unit to the transmission channel described analog-to-digital conversion module output.
In conjunction with the implementation of first aspect, in the 4th kind of possible implementation, described digital interference cancellation module is specifically for the offseting signal using the negative value of the product of described channel guess value and described primary signal as described remaining self-interference signal, by described offseting signal with described in comprise remaining self-interference signal received IF signal be added and process the remaining self-interference signal of eliminating through in the received IF signal of digital translation.
Second aspect, the self interference signal clearing method that the embodiment of the present invention provides a kind of communication terminal of applying above-mentioned first aspect and providing to carry out, comprising:
Described simulation process module is converted to received IF signal the reception signal that comprises remaining self-interference signal in analog domain, wherein, described remaining self-interference signal is the self-interference signal that the reception signal that comprises self-interference signal is not eliminated after simulation interference cancellation module is processed;
Described analog-to-digital conversion module is transformed into numeric field the received IF signal that comprises remaining self-interference signal from analog domain;
Described digital interference cancellation module obtains the primary signal of digital modulation module at the self-interference signal of intermediate frequency numeric field generation, and determine from obtaining the node of described primary signal to the channel guess value of transmission channel described analog-to-digital conversion module output, obtain the offseting signal of described remaining self-interference signal according to described primary signal and described channel guess value, utilize described offseting signal to eliminate through the remaining self-interference signal in the received IF signal of digital translation;
Described digital demodulation module is carried out down-converted and is obtained baseband digital signal eliminating the received IF signal of remaining self-interference signal.
In the possible implementation of the first, described determine specifically comprise to the channel guess value of transmission channel described analog-to-digital conversion module output from the node that obtains described primary signal:
To described primary signal and described in comprise remaining self-interference signal received IF signal carry out auto-correlation processing, obtain node from the obtaining described primary signal channel guess value to transmission channel described analog-to-digital conversion module output.
In conjunction with the implementation of second aspect, in the possible implementation of the second, described digital modulation module comprises: the Digital Up Convert unit that generates intermediate frequency transmitted signal for baseband digital signal being carried out to upconversion process, and for described intermediate frequency transmitted signal being carried out to the digital pre-distortion unit of distortion compensation processing, wherein, the output of described Digital Up Convert unit is connected with the input of described digital pre-distortion unit, the described node that obtains described primary signal is positioned at the output of described Digital Up Convert unit, described primary signal is intermediate frequency transmitted signal,
Described determine specifically comprise to the channel guess value of transmission channel described analog-to-digital conversion module output from the node that obtains described primary signal:
Output from described Digital Up Convert unit is carried out to linear channel valuation to the transmission channel described analog-to-digital conversion module output.
In conjunction with the implementation of second aspect, in the third possible implementation, described digital modulation module comprises: the Digital Up Convert unit that generates intermediate frequency transmitted signal for baseband digital signal being carried out to upconversion process, and for described intermediate frequency transmitted signal being carried out to the digital pre-distortion unit of distortion compensation processing, wherein, the output of described Digital Up Convert unit is connected with the input of described digital pre-distortion unit, the described node that obtains described primary signal is positioned at the output of described digital pre-distortion unit, described primary signal is the intermediate frequency transmitted signal after distortion compensation,
Described determine specifically comprise to the channel guess value of transmission channel described analog-to-digital conversion module output from the node that obtains described primary signal:
Output from described digital pre-distortion unit is carried out to nonlinear channel valuation to the transmission channel described analog-to-digital conversion module output.
In conjunction with the implementation of second aspect, in the 4th kind of possible implementation, the described offseting signal that obtains described remaining self-interference signal according to described primary signal and described channel guess value, utilizes described offseting signal to eliminate through the remaining self-interference signal in the received IF signal of digital translation and specifically comprises:
Offseting signal using the negative value of the product of described channel guess value and described primary signal as described remaining self-interference signal, by described offseting signal with described in comprise remaining self-interference signal received IF signal be added and process the remaining self-interference signal of eliminating through in the received IF signal of digital translation.
As shown from the above technical solution, the communication terminal that the embodiment of the present invention provides and self interference signal clearing method, the reception signal that comprises remaining self-interference signal is converted to after received IF signal in analog domain by simulation process module, analog-to-digital conversion module is transformed into numeric field the received IF signal that comprises remaining self-interference signal from analog domain, then digital interference cancellation module obtains the primary signal of digital modulation module at the self-interference signal of intermediate frequency numeric field generation, and determine from obtaining the node of primary signal to the channel guess value of transmission channel analog-to-digital conversion module output, obtain the offseting signal of remaining self-interference signal according to primary signal and channel guess value, utilize offseting signal to eliminate through the remaining self-interference signal in the received IF signal of digital translation, digital demodulation module is carried out down-converted and is obtained baseband digital signal eliminating the received IF signal of remaining self-interference signal, thereby the remaining self-interference signal of having realized receiving in signal after simulation is eliminated carries out Processing for removing further, the impact of the minimizing self-interference signal of maximum possible on useful signal.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of an embodiment of communication terminal of the present invention;
The flow chart of the self interference signal clearing method embodiment that Fig. 2 carries out for 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
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the structural representation of an embodiment of communication terminal of the present invention, as shown in Figure 1, this communication terminal 1 comprises: simulation process module 11, for the reception signal that comprises remaining self-interference signal being converted to received IF signal at analog domain, wherein, remaining self-interference signal is the self-interference signal that the reception signal that comprises self-interference signal is not eliminated after simulation interference cancellation module 12 is processed; An analog-to-digital conversion module 13, for being transformed into numeric field the received IF signal that comprises remaining self-interference signal from analog domain; One is coupled to the digital interference cancellation module 14 of analog-to-digital conversion module 13, for obtaining the primary signal of digital modulation module 15 at the self-interference signal of intermediate frequency numeric field generation, and determine from obtaining the node of primary signal to the channel guess value of transmission channel analog-to-digital conversion module 13 outputs, obtain the offseting signal of remaining self-interference signal according to primary signal and channel guess value, utilize offseting signal to eliminate through the remaining self-interference signal in the received IF signal of digital translation; One is coupled to the digital demodulation module 16 of digital interference cancellation module 14, obtains baseband digital signal for the received IF signal of eliminating remaining self-interference signal is carried out to down-converted.
Particularly, the flow chart of the self interference signal clearing method embodiment that Fig. 2 carries out for the communication terminal shown in application drawing 1, the method specifically comprises:
Step 100, simulation process module is converted to received IF signal the reception signal that comprises remaining self-interference signal in analog domain, wherein, described remaining self-interference signal is the self-interference signal that the reception signal that comprises self-interference signal is not eliminated after simulation interference cancellation module is processed;
The communication terminal that the embodiment of the present invention provides is applicable to multiple communications network system, comprise Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, WCDMA) system, TD SDMA (Time Division-Synchronous Code Division Multiple Access, TD-SCDMA) system, worldwide interoperability for microwave access (Worldwide Interoperability forMicrowave Access, WiMax) system etc.When two communication terminals carry out communication with frequency at the same time, the signal that communication terminal receives by reception antenna not only comprises the useful signal that opposite end sends, and also comprises the self-interference signal that oneself sends.In order to reduce the impact of self-interference signal on useful signal, first communication terminal simulates Processing for removing by simulation cancellation module to self-interference signal, after simulation Processing for removing, self-interference signal on some frequency can be eliminated, but the self-interference signal on some frequency is not eliminated and is remaining self-interference signal.Then after the reception signal that comprises remaining self-interference signal being converted to received IF signal by the simulation process module of communication terminal in analog domain, send to analog-to-digital conversion module.
Step 101, analog-to-digital conversion module is transformed into numeric field the received IF signal that comprises remaining self-interference signal from analog domain;
Owing to having eliminated a part of self-interference signal by the processing of simulation interference cancellation module before, thereby ensure that useful signal can not blocked by remaining self-interference signal in the time that analog-to-digital conversion module carries out analog-to-digital conversion, therefore, the received IF signal that comprises remaining self-interference signal from analog domain is transformed into numeric field, is sent to digital interference cancellation module by analog-to-digital conversion module.
Step 102, digital interference cancellation module obtains the primary signal of digital modulation module at the self-interference signal of intermediate frequency numeric field generation, and determine from obtaining the node of described primary signal to the channel guess value of transmission channel described analog-to-digital conversion module output, obtain the offseting signal of described remaining self-interference signal according to described primary signal and described channel guess value, utilize described offseting signal to eliminate through the remaining self-interference signal in the received IF signal of digital translation;
The offseting signal of digital interference cancellation module by obtaining remaining self-interference signal is to utilize offseting signal to eliminate through the remaining self-interference signal in the received IF signal of digital translation, be specially: first, because current remaining self-interference signal is digital medium-frequency signal, and remaining self-interference signal refers to that communication terminal has received by reception antenna the signal self sending, the signal self sending is through simulation interference cancellation module, it after simulation process module and analog-to-digital conversion module, is exactly remaining self-interference signal, therefore, digital interference cancellation module obtains the intermediate frequency transmitted signal that digital modulation module produces, it is digital interference cancellation module is obtained from interference signal primary signal at intermediate frequency numeric field.Then digital interference cancellation module is determined from obtaining the node of primary signal to the channel guess value of transmission channel analog-to-digital conversion module output, and obtain the offseting signal of remaining self-interference signal according to primary signal and channel guess value, thereby utilize offseting signal to eliminate through the remaining self-interference signal in the received IF signal of digital translation.Be understandable that, those of ordinary skill in the art can utilize channel guess value method of the prior art to carry out channel estimating to above-mentioned transmission channel, concrete channel guess value method comprises: LMS channel estimation method, LS channel estimation method etc. because belonging to prior art, repeat no more herein.The offseting signal of remaining self-interference signal is obtained in the logical relation computings such as the offseting signal that obtains remaining self-interference signal according to primary signal and channel guess value specifically can need to multiply each other to primary signal and channel guess value according to system applies, weighting, to utilize offseting signal to balance out through the remaining self-interference signal in the received IF signal of digital translation, thereby reduce to greatest extent remaining self-interference signal, especially after simulation interference elimination treatment, disturb the remaining self-interference signal of eliminating on poor frequency.
Step 103, digital demodulation module is carried out down-converted and is obtained baseband digital signal eliminating the received IF signal of remaining self-interference signal.
Digital demodulation module is obtained the received IF signal that remaining self-interference signal is carried out to Processing for removing from digital interference cancellation module, useful signal in received IF signal now can not be subject to the impact of remaining self-interference signal, and digital demodulation module is carried out down-converted to obtain the baseband digital signal of opposite end communication terminal be useful signal eliminating the received IF signal of remaining self-interference signal.
As shown from the above technical solution, the communication terminal that the embodiment of the present invention provides and self interference signal clearing method, the reception signal that comprises remaining self-interference signal is converted to after received IF signal in analog domain by simulation process module, analog-to-digital conversion module is transformed into numeric field the received IF signal that comprises remaining self-interference signal from analog domain, then digital interference cancellation module obtains the primary signal of digital modulation module at the self-interference signal of intermediate frequency numeric field generation, and determine from obtaining the node of primary signal to the channel guess value of transmission channel analog-to-digital conversion module output, obtain the offseting signal of remaining self-interference signal according to primary signal and channel guess value, utilize offseting signal to eliminate through the remaining self-interference signal in the received IF signal of digital translation, digital demodulation module is carried out down-converted and is obtained baseband digital signal eliminating the received IF signal of remaining self-interference signal, thereby the remaining self-interference signal of having realized receiving in signal after simulation is eliminated carries out Processing for removing further, the impact of the minimizing self-interference signal of maximum possible on useful signal.
Can adopt the above-mentioned LMS channel estimation method mentioned from the node that obtains primary signal to the channel guess value of transmission channel analog-to-digital conversion module output for digital interference cancellation module 14 how to confirms, LS channel estimation method, or adaptive training method, preferably, digital interference cancellation module 14 is determined channel guess value by relevant treatment, be digital interference cancellation module 14 specifically for: primary signal and the received IF signal that comprises remaining self-interference signal are carried out to auto-correlation processing, obtain node from the obtaining primary signal channel guess value to transmission channel analog-to-digital conversion module output.
How obtain the offseting signal of remaining self-interference signal according to primary signal and channel guess value for digital interference cancellation module 14, utilizing offseting signal to eliminate through the logical calculation method of the remaining self-interference signal in the received IF signal of digital translation has a lot, the mode of simple optimizing is, digital interference cancellation module 14 is specifically for the offseting signal using the negative value of the product of channel guess value and primary signal as remaining self-interference signal, offseting signal and the received IF signal that comprises remaining self-interference signal are added and process the remaining self-interference signal of eliminating through in the received IF signal of digital translation.
For the node 16 that obtains primary signal in the embodiment shown in Fig. 1, because primary signal refers to the transmitted signal that digital modulation module produces at intermediate frequency numeric field, therefore the specific functional units that the position of node 16 can comprise according to digital modulation module is selected, be not limited to one, describe below by the communication terminal structural representation shown in Fig. 3, specific 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 embodiment illustrated in fig. 1, digital modulation module 15 comprises: Digital Up Convert (the Digital Up Converter that generates intermediate frequency transmitted signal for baseband digital signal being carried out to upconversion process, DUC) unit 151, and for centering digital pre-distortion (the Digital Pre-Distortio that transmitted signal is carried out distortion compensation processing frequently, DPD) unit 152, wherein, the output of Digital Up Convert unit 151 is connected with the input of digital pre-distortion unit 152.
The first implementation, when the output that obtains the node of primary signal and be positioned at Digital Up Convert unit 151 is A point, primary signal is intermediate frequency transmitted signal.In this implementation owing to being to obtain primary signal from DPD, need modeling from the output terminals A point of Digital Up Convert unit 151 to the transmission channel analog-to-digital conversion module 13 output C points, the channel distortion causing due to the power amplifier of the transmitting terminal to communication terminal by DPD on this transmission channel is proofreaied and correct, channel is approximately linear characteristic substantially, the transmission channel that digital interference cancellation module 14 is put between analog-to-digital conversion module 13 output C points specifically for the output terminals A to from Digital Up Convert unit 151 carries out linear channel valuation, concrete linear channel is estimated can by training or adaptive mode realizes.The major advantage of this implementation is that Channel Modeling is simple, and shortcoming is changed by DPD operating state, requires high or need consider DPD carrys out project training sequence to the follow-up control of adaptive algorithm.It should be noted that, Fig. 3 is transformed into the process of remaining self-interference signal for the transmitted signal of communication terminal self is clearly described, the transmitting processing module that comprises power amplifier is schematically shown, this transmitting processing module has only identified the module that the present embodiment relates to, and the module that all the other do not identify and unit are not inventive point of the present invention or the module arriving that relates to.
The second implementation, when the output that obtains the node of primary signal and be positioned at digital pre-distortion unit 152 is B point, primary signal is the intermediate frequency transmitted signal after distortion compensation.In this implementation owing to being to obtain primary signal from DPD, need modeling from the output B point of digital pre-distortion unit 152 to the transmission channel analog-to-digital conversion module 13 output C points, on this transmission channel due to the channel distortion that is subject to the power amplifier of transmitting terminal of communication terminal and causes, channel is nonlinear characteristic, digital interference cancellation module 14 carries out nonlinear channel valuation specifically for the output B point to from digital pre-distortion unit 152 to the transmission channel analog-to-digital conversion module 13 output C points, concrete nonlinear channel is estimated can by training or adaptive mode realizes.The major advantage of this implementation is the impact that not changed by DPD operating state, and shortcoming is nonlinear channel algorithm for estimating complexity.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, in the time carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a communication terminal, is characterized in that, comprising:
Simulation process module, for the reception signal that comprises remaining self-interference signal being converted to received IF signal at analog domain, wherein, described remaining self-interference signal is the self-interference signal that the reception signal that comprises self-interference signal is not eliminated after simulation interference cancellation module is processed;
An analog-to-digital conversion module, for being transformed into numeric field the received IF signal that comprises remaining self-interference signal from analog domain;
One is coupled to the digital interference cancellation module of described analog-to-digital conversion module, for obtaining the primary signal of digital modulation module at the self-interference signal of intermediate frequency numeric field generation, and determine from obtaining the node of described primary signal to the channel guess value of transmission channel described analog-to-digital conversion module output, obtain the offseting signal of described remaining self-interference signal according to described primary signal and described channel guess value, utilize described offseting signal to eliminate through the remaining self-interference signal in the received IF signal of digital translation;
One is coupled to the digital demodulation module of described digital interference cancellation module, obtains baseband digital signal for the received IF signal of eliminating remaining self-interference signal is carried out to down-converted.
2. communication terminal according to claim 1, is characterized in that,
Described digital interference cancellation module specifically for: to described primary signal and described in comprise remaining self-interference signal received IF signal carry out auto-correlation processing, obtain node from the obtaining described primary signal channel guess value to transmission channel described analog-to-digital conversion module output.
3. communication terminal according to claim 1, it is characterized in that, described digital modulation module comprises: the Digital Up Convert unit that generates intermediate frequency transmitted signal for baseband digital signal being carried out to upconversion process, and for described intermediate frequency transmitted signal being carried out to the digital pre-distortion unit of distortion compensation processing, wherein, the output of described Digital Up Convert unit is connected with the input of described digital pre-distortion unit, the described node that obtains described primary signal is positioned at the output of described Digital Up Convert unit, and described primary signal is intermediate frequency transmitted signal;
Described digital interference cancellation module, carries out linear channel valuation specifically for the output to from described Digital Up Convert unit to the transmission channel described analog-to-digital conversion module output.
4. communication terminal according to claim 1, it is characterized in that, described digital modulation module comprises: the Digital Up Convert unit that generates intermediate frequency transmitted signal for baseband digital signal being carried out to upconversion process, and for described intermediate frequency transmitted signal being carried out to the digital pre-distortion unit of distortion compensation processing, wherein, the output of described Digital Up Convert unit is connected with the input of described digital pre-distortion unit, the described node that obtains described primary signal is positioned at the output of described digital pre-distortion unit, described primary signal is the intermediate frequency transmitted signal after distortion compensation,
Described digital interference cancellation module, carries out nonlinear channel valuation specifically for the output to from described digital pre-distortion unit to the transmission channel described analog-to-digital conversion module output.
5. according to the arbitrary described communication terminal of claim 1-4, it is characterized in that,
Described digital interference cancellation module is specifically for the offseting signal using the negative value of the product of described channel guess value and described primary signal as described remaining self-interference signal, by described offseting signal with described in comprise remaining self-interference signal received IF signal be added and process the remaining self-interference signal of eliminating through in the received IF signal of digital translation.
6. the self interference signal clearing method that application communication terminal as claimed in claim 1 carries out, is characterized in that, described method comprises:
Described simulation process module is converted to received IF signal the reception signal that comprises remaining self-interference signal in analog domain, wherein, described remaining self-interference signal is the self-interference signal that the reception signal that comprises self-interference signal is not eliminated after simulation interference cancellation module is processed;
Described analog-to-digital conversion module is transformed into numeric field the received IF signal that comprises remaining self-interference signal from analog domain;
Described digital interference cancellation module obtains the primary signal of digital modulation module at the self-interference signal of intermediate frequency numeric field generation, and determine from obtaining the node of described primary signal to the channel guess value of transmission channel described analog-to-digital conversion module output, obtain the offseting signal of described remaining self-interference signal according to described primary signal and described channel guess value, utilize described offseting signal to eliminate through the remaining self-interference signal in the received IF signal of digital translation;
Described digital demodulation module is carried out down-converted and is obtained baseband digital signal eliminating the received IF signal of remaining self-interference signal.
7. self interference signal clearing method according to claim 6, is characterized in that, described determine specifically comprise to the channel guess value of transmission channel described analog-to-digital conversion module output from the node that obtains described primary signal:
To described primary signal and described in comprise remaining self-interference signal received IF signal carry out auto-correlation processing, obtain node from the obtaining described primary signal channel guess value to transmission channel described analog-to-digital conversion module output.
8. self interference signal clearing method according to claim 6, it is characterized in that, described digital modulation module comprises: the Digital Up Convert unit that generates intermediate frequency transmitted signal for baseband digital signal being carried out to upconversion process, and for described intermediate frequency transmitted signal being carried out to the digital pre-distortion unit of distortion compensation processing, wherein, the output of described Digital Up Convert unit is connected with the input of described digital pre-distortion unit, the described node that obtains described primary signal is positioned at the output of described Digital Up Convert unit, described primary signal is intermediate frequency transmitted signal,
Described determine specifically comprise to the channel guess value of transmission channel described analog-to-digital conversion module output from the node that obtains described primary signal:
Output from described Digital Up Convert unit is carried out to linear channel valuation to the transmission channel described analog-to-digital conversion module output.
9. self interference signal clearing method according to claim 6, it is characterized in that, described digital modulation module comprises: the Digital Up Convert unit that generates intermediate frequency transmitted signal for baseband digital signal being carried out to upconversion process, and for described intermediate frequency transmitted signal being carried out to the digital pre-distortion unit of distortion compensation processing, wherein, the output of described Digital Up Convert unit is connected with the input of described digital pre-distortion unit, the described node that obtains described primary signal is positioned at the output of described digital pre-distortion unit, described primary signal is the intermediate frequency transmitted signal after distortion compensation,
Described determine specifically comprise to the channel guess value of transmission channel described analog-to-digital conversion module output from the node that obtains described primary signal:
Output from described digital pre-distortion unit is carried out to nonlinear channel valuation to the transmission channel described analog-to-digital conversion module output.
10. according to the arbitrary described self interference signal clearing method of claim 6-9, it is characterized in that,
The described offseting signal that obtains described remaining self-interference signal according to described primary signal and described channel guess value, utilizes described offseting signal to eliminate through the remaining self-interference signal in the received IF signal of digital translation and specifically comprises:
Offseting signal using the negative value of the product of described channel guess value and described primary signal as described remaining self-interference signal, by described offseting signal with described in comprise remaining self-interference signal received IF signal be added and process the remaining self-interference signal of eliminating through in the received IF signal of digital translation.
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| CN105530059A (en) * | 2015-12-10 | 2016-04-27 | 南方科技大学 | Communication method and communication system |
| CN105934889A (en) * | 2014-08-20 | 2016-09-07 | 华为技术有限公司 | Analog compensation circuit and method |
| CN110731053A (en) * | 2019-04-29 | 2020-01-24 | Oppo广东移动通信有限公司 | Self-interference estimation method and terminal equipment |
| WO2020093332A1 (en) * | 2018-11-08 | 2020-05-14 | 华为技术有限公司 | Method, device and system for interference elimination |
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