CN110365348A - A kind of remove inhibits system and method with frequency self-interference while being difficult to resoluting signal - Google Patents
A kind of remove inhibits system and method with frequency self-interference while being difficult to resoluting signal Download PDFInfo
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- CN110365348A CN110365348A CN201910636155.7A CN201910636155A CN110365348A CN 110365348 A CN110365348 A CN 110365348A CN 201910636155 A CN201910636155 A CN 201910636155A CN 110365348 A CN110365348 A CN 110365348A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—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
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- 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
- H04B1/525—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 with means for reducing leakage of transmitter signal into the receiver
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Abstract
The invention discloses system and method is inhibited with frequency self-interference while a kind of removal is difficult to resoluting signal, the system comprises digital signal processing unit, emitting module, receiving unit, transmitting antenna, receiving antenna and disturbance reconstruction units；The input terminal of the emitting module is connect with digital signal processing unit, and the output end of emitting module is connect with transmitting antenna and disturbance reconstruction unit respectively；The output end of the disturbance reconstruction unit and receiving antenna is all connect with receiving unit, and the output end of the receiving unit is connect with digital signal processing unit；The digital signal processing unit is also connect with the control signal of receiving unit.The present invention can be when satisfaction be difficult to the existence condition of resoluting signal, stop the reception to signal, when being unsatisfactory for being difficult to the existence condition of resoluting signal, is normally carried out signal reception, and then effectively inhibit self-interference and remove to be difficult to resoluting signal, be conducive to the reception of useful signal.
Description
Technical field
The present invention relates to self-interference inhibition, press down while being difficult to resoluting signal more particularly to a kind of removal with frequency self-interference
System and method processed.
Background technique
Today's society increasingly increases wireless data service demand, and the spatial wireless channels degree of crowding is but more prominent, this
People are forced to seek new method constantly to improve frequency spectrum resource utilization rate and equipment interference free performance.If wireless telecom equipment makes
Emit and receive wireless signal with same time, the full duplex technology of identical frequency, unquestionably this will be so that wireless communication
The spectrum efficiency of link doubles.However, can make to send out when the transmitting terminal of wireless telecom equipment and receiving end work with frequency simultaneously
The transmission signal that sending end generates enters the receiving channel of receiving end, is formed from signal interference, which, which is much better than, connects
The intensity from remote wireless communications device signal that receiving end receives sends far-end wireless device to seriously affect receiving end
The reception of signal.Usual situation, this will reduce the sensitivity of receiving end, increase the bit error rate, communication performance is caused to decline.Cause
This, inhibits extremely important for the self-interference for receiving signal progress radio frequency domains of full-duplex transceiver.
Under complicated wireless channel environment, self-interference channel has high power, the characteristics such as time-varying, near full duplex receiver
Reflection, scattering will lead to high power self-interference interference contribution abundant.Shaggy single reflector can also produce
Time delay differs very small multiple subpaths.When the difference of time delay is much smaller than the inverse of signal bandwidth, receiving end can not be them
It separates.In self-interference inhibition, especially radio frequency domains inhibit, and are limited to AF panel cost, complexity and spatial volume
Deng generalling use limited tap filter to rebuild the self-interference signal containing rich multipath ingredient, this mode can not press down
System is difficult to resoluting signal, this is also very big reason existing for remaining self-interference.
Summary of the invention
With frequency while being difficult to resoluting signal it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of removal
Self-interference inhibits system and method, can effectively inhibit self-interference and remove to be difficult to resoluting signal, be conducive to useful signal
It receives.
The purpose of the present invention is achieved through the following technical solutions: a kind of to remove while being difficult to resoluting signal with frequency
Self-interference inhibits system, including digital signal processing unit, emitting module, receiving unit, transmitting antenna, receiving antenna and interference
Reconstruction unit；The input terminal of the emitting module is connect with digital signal processing unit, the output end of emitting module respectively with hair
Antenna is penetrated to connect with disturbance reconstruction unit；The output end of the disturbance reconstruction unit and receiving antenna is connect with receiving unit,
The output end of the receiving unit is connect with digital signal processing unit；The digital signal processing unit also with receiving unit
Control signal connection；
The digital signal processing unit is transferred to emitting module and is handled, simultaneously for generating baseband digital signal
Receiving unit is controlled, the signal of receiving unit output is received；
The emitting module, for carrying out DA conversion, upper change to the baseband digital signal from digital signal processing unit
Frequency and enhanced processing, and by the way that transmitting antenna will treated that signal launches outward, at the same signal of inciting somebody to action that treated be transferred to it is dry
Reconstruction unit is disturbed, provides local self-interference information for disturbance reconstruction unit；
The disturbance reconstruction unit, the local self-interference information for being provided according to emitting module rebuild local self-interference
Offseting signal, and it is transferred to receiving unit；
The receiving unit, for being received to the signal that receiving antenna exports, and in digital signal processing unit
Under control, using local self-interference cancellation signal, local self-interference is carried out to the signal of receiving antenna output and is inhibited, then remove difficulty
After resoluting signal, obtained signal is subjected to down coversion and analog-to-digital conversion process, and be transferred to digital signal processing unit.
The emitting module includes DAC module, up-converter module, amplification module and coupler；The input of the DAC module
End is connect with digital signal processing unit, and the output end of DAC module passes sequentially through up-converter module and connect with amplification module, described
The output end of amplification module is connect with transmitting antenna and disturbance reconstruction unit respectively by coupler.
The receiving unit includes combiner, receives switch, down conversion module and ADC module；The input of the combiner
End is connect with disturbance reconstruction unit and receiving antenna respectively, and the output end of combiner passes sequentially through reception switch, down conversion module
It is connect with ADC module with digital signal processing unit；The control signal for receiving switch and digital signal processing unit connect
It connects.
The digital signal processing unit includes:
Signal transmitting and receiving module is transferred to emitting module and is handled, and to receiving unit for generating baseband digital signal
The signal of output is received；
Condition determining module, for determining the existence condition for being difficult to resoluting signal；
Switch control unit, switch control unit, for judging that being difficult to resoluting signal currently whether there is, and be difficult to differentiate
It in the presence of signal, controls and receives switch and disconnects, stop receiving signal, in the absence of being difficult to resoluting signal, control and receive out
It closes and closes, be normally carried out signal reception, and then realize the removal for being difficult to resoluting signal.
It is a kind of to remove while being difficult to resoluting signal with frequency self-interference suppressing method, comprising the following steps:
S1. digital signal processing unit generates baseband digital signal, is transferred to after DAC module converted, through up-conversion
Module and amplifier are sent into coupler, export two paths of signals by coupler, and emitted antenna launches outward all the way, all the way as this
Ground self-interference information is transferred to disturbance reconstruction unit；
S2. the local self-interference information that disturbance reconstruction unit is provided according to emitting module is rebuild self-interference signal and is transferred to
Combiner；
S3. combiner is carried out using the self-interference signal rebuild to self-interference signal present in antenna output signal is received
Inhibit, and the received switch of the signal after inhibition, down conversion module and ADC module are transferred to digital signal processing unit；
S4. digital signal processing unit judgement, which is difficult to resoluting signal, currently whether there is, if being difficult to resoluting signal presence, control
System receives switch and disconnects, and stops receiving signal, is not present if being difficult to resoluting signal, controls and receives and close the switch, be normally carried out
Signal receives, and then realizes the removal for being difficult to resoluting signal.
The step S4 includes:
S401. it sets self-interference signal to be made of the sum of distinguishable multipath component of M item, wherein the m articles distinguishable multipath be not by
Distinguishable NmSingle sub path composition, NmThe collection of the time delay composition of single sub path is combined intoReceive from
Interference signal are as follows:
Wherein, fcFor carrier frequency, am,nFor the amplitude of the nth subpath in the m articles multipath, θm,nFor the m articles multipath
In nth subpath phase shift, u (t) be emitting module send symbol, z (t) be white Gaussian noise, without loss of generality, it is believed that
The duration of current symbol is 0≤t≤Ts, TsFor symbol width；
By sine wave composition principle, if current symbol and previous symbol are different, in current symbol width
N in time, in the m articles distinguishable multipathmSingle sub path forms NmSynthesis sine；Due to this NmThe maximum of single sub path
Time delay and the difference of minimal time delay are far smaller than a symbol width Ts, it may be assumed that
Because of N before thism- 1 sine wave continues total time as TmIt is very small, it is unable to receiving end resolution, so in interference signal weight
When building, a sine wave r can only be generated by a tapm(t) rebuild and offset the m articles multipath signal, that is,
WhereinTherefore, the m articles multipath, which exists, offsets remnants:
That is, if a upper symbol and current symbol difference, τm,min≤t≤τm,min+Tm, when m=1,2 ..., M
Between the multipath self-interference of section can not be cancelled, therefore determine the existence condition for being difficult to resoluting signal:
Current symbol is different from a upper symbol and τm,min≤t≤τm,min+Tm, m=1,2 ..., M；
S402. it sets at the beginning of current symbol as t=0, end time t=Ts, judge that emitting module is currently transmitted
Symbol and previous symbol it is whether identical:
If it is different, then digital signal processing unit controls and receives the time that switch disconnects are as follows:
τm,min≤t≤τm,min+Tm, m=1,2 ... M；
Remaining time figure signal processing unit, which controls and receives, to be closed the switch, in which:
τm,nIt can for the m articles
Differentiate the time delay of the nth subpath in multipath, n=1,2,3 ..., m；
If identical, 0≤t of current symbol time≤TsInterior, digital signal processing unit controls and receives switch and closes always
It closes.
The beneficial effects of the present invention are: the present invention can stop when satisfaction is difficult to the existence condition of resoluting signal to letter
Number reception be normally carried out signal reception when being unsatisfactory for being difficult to the existence condition of resoluting signal, and then effectively inhibit from dry
It disturbs and removes and be difficult to resoluting signal, be conducive to the reception of useful signal；Simultaneously as be difficult to resoluting signal there are the times very
Short, the scheme of the application does not have excessive influence to useful signal is received.
Detailed description of the invention
Fig. 1 is system principle diagram of the invention；
Fig. 2 is flow chart of the method for the present invention；
Fig. 3 is the embodiment of the present invention schematic illustration；
In figure, 1- digital signal processing unit, 2-DAC module, 3- up-converter module, 4- amplification module, 5- coupler, 6-
Transmitting antenna, 7- disturbance reconstruction unit, 8- receiving antenna, 9- combiner, 10- down conversion module, 11-ADC module, 12- are received
Switch.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing, but protection scope of the present invention is not limited to
It is as described below.
As shown in Figure 1, a kind of removal is difficult to inhibit at system, including digital signal while resoluting signal with frequency self-interference
Manage unit 1, emitting module, receiving unit, transmitting antenna 6, receiving antenna 8 and disturbance reconstruction unit 7；The emitting module it is defeated
Enter end to connect with digital signal processing unit 1, the output end of emitting module connects with transmitting antenna 6 and disturbance reconstruction unit 7 respectively
It connects；The output end of the disturbance reconstruction unit 7 and receiving antenna 8 is connect with receiving unit, the output end of the receiving unit
It is connect with digital signal processing unit 1；The digital signal processing unit 1 is also connect with the control signal of receiving unit；
The digital signal processing unit 1 is transferred to emitting module and is handled, together for generating baseband digital signal
When receiving unit is controlled, to receiving unit output signal receive；
The emitting module, for carrying out DA conversion, upper change to the baseband digital signal from digital signal processing unit 1
Frequency and enhanced processing, and by the way that transmitting antenna 6 will treated that signal launches outward, at the same signal of inciting somebody to action that treated be transferred to it is dry
Reconstruction unit 7 is disturbed, provides local self-interference information for disturbance reconstruction unit 7；
The disturbance reconstruction unit 7, the local self-interference information for being provided according to emitting module rebuild local self-interference
Offseting signal, and it is transferred to receiving unit；
The receiving unit, the signal for exporting to receiving antenna 8 receive, and in digital signal processing unit 1
Control under, using local self-interference cancellation signal, local self-interference is carried out to the signal that receiving antenna 8 exports and is inhibited, then is gone
After being difficult to resoluting signal, obtained signal is subjected to down coversion and analog-to-digital conversion process, and be transferred to Digital Signal Processing list
Member 1.
The emitting module includes DAC module 2, up-converter module 3, amplification module 4 and coupler 5；The DAC module 2
Input terminal connect with digital signal processing unit 1, the output end of DAC module 2 passes sequentially through up-converter module 3 and amplification module
The output end of 4 connections, the amplification module 4 is connect with transmitting antenna 6 and disturbance reconstruction unit 7 respectively by coupler.
The receiving unit includes combiner 9, receives switch 12, down conversion module 10 and ADC module 11；The combiner
9 input terminal is connect with disturbance reconstruction unit 7 and receiving antenna 8 respectively, the output end of combiner pass sequentially through receive switch 12,
Down conversion module 10 and ADC module 11 are connect with digital signal processing unit 1；The control signal and number for receiving switch 12
The connection of word signal processing unit.
The digital signal processing unit 1 includes:
Signal transmitting and receiving module is transferred to emitting module and is handled, and to receiving unit for generating baseband digital signal
The signal of output is received；
Condition determining module, for determining the existence condition for being difficult to resoluting signal；
Switch control unit, switch control unit, for judging that being difficult to resoluting signal currently whether there is, and be difficult to differentiate
It in the presence of signal, controls and receives switch and disconnects, stop receiving signal, in the absence of being difficult to resoluting signal, control and receive out
It closes and closes, be normally carried out signal reception, and then realize the removal for being difficult to resoluting signal.
As shown in Fig. 2, a kind of remove while being difficult to resoluting signal with frequency self-interference suppressing method, comprising the following steps:
S1. digital signal processing unit 1 generates baseband digital signal, is transferred to after DAC module 2 converted, through upper change
Frequency module 3 and amplifier 4 are sent into coupler 5, export two paths of signals by coupler 5, and emitted antenna 6 launches outward all the way, and one
Road is transferred to disturbance reconstruction unit 7 as local self-interference information；
S2. the local self-interference information that disturbance reconstruction unit 7 is provided according to emitting module is rebuild self-interference signal and is transferred to
Combiner 9；
S3. combiner 9 using rebuild self-interference signal to self-interference signal present in 8 output signal of receiving antenna into
Row inhibits, and the received switch 12 of signal, down conversion module 10 and the ADC module 11 after inhibition are transferred to Digital Signal Processing
Unit 1；In embodiments herein, combiner 9 passes through by self-interference signal present in 8 output signal of receiving antenna and again
The self-interference signal built subtracts each other, and completes self-interference and inhibits.
S4. the judgement of digital signal processing unit 1, which is difficult to resoluting signal, currently whether there is, if being difficult to resoluting signal presence,
The disconnection of switch 12 is controlled and received, stops receiving signal, is not present if being difficult to resoluting signal, controls and receives the closure of switch 12, just
Signal reception is often carried out, and then realizes the removal for being difficult to resoluting signal.
The step S4 includes:
S401. self-interference signal is set to be made of the sum of distinguishable multipath component of M item, wherein the m articles distinguishable multipath by when
Prolong difference very little, and indistinguishable NmSingle sub path composition, NmThe collection of the time delay composition of single sub path is combined intoThe self-interference signal received are as follows:
Wherein, fcFor carrier frequency, am,nFor the amplitude of the nth subpath in the m articles multipath, θm,nFor the m articles multipath
In nth subpath Doppler phase shift, u (t) be emitting module send symbol, without loss of generality, it is believed that work as former code
The duration of member is 0≤t≤Ts, z (t) is white Gaussian noise；
By sine wave composition principle, if current symbol and previous symbol are different, in current symbol width
Interior, in the m articles distinguishable multipath NmSingle sub path forms NmSynthesis sine；Due to this NmThe maximum delay of single sub path
It is far smaller than a symbol width T with the difference of minimal time delays, it may be assumed that
Because of N before thism- 1 sine wave continues total time as TmIt is very small, it is unable to receiving end resolution, the signal of this period is
To be difficult to resoluting signal, when interference signal is rebuild, a sine wave r can only be generated by a tapm(t) it rebuilds and supports
Disappear the m articles multipath signal, that is,
WhereinTherefore, the m articles multipath, which exists, offsets remnants:
That is, if a upper symbol and current symbol difference, τm,min≤t≤τm,min+Tm, when m=1,2 ..., M
Between the multipath self-interference of section can not be cancelled, as shown in figure 3, illustrating and being closed by three single sub paths in embodiments herein
At a multipath, it can be seen that this synthesis diameter by three sinusoidal wave components, but due to the first two sine wave it is lasting when
Between it is very short, so transceiver can not detect, and a sine wave can only be rebuild when radio frequency domains are rebuild, it is difficult to resoluting signal without
Method is cancelled.τm,minSize be can in advance by receiver (receiving unit) detection obtain, therefore determination be difficult to resoluting signal
Existence condition:
Current symbol is different from a upper symbol and τm,min≤t≤τm,min+Tm, m=1,2 ..., M；
S402. it sets at the beginning of current symbol as t=0, end time t=Ts, judge that emitting module is currently transmitted
Symbol and previous symbol it is whether identical:
If it is different, then digital signal processing unit 1 controls and receives the time of the disconnection of switch 12 are as follows:
τm,min≤t≤τm,min+Tm, m=1,2 ... M；
Remaining time figure signal processing unit 1 controls and receives the closure of switch 12, in which:
τm,nIt can for the m articles
Differentiate the time delay of the nth subpath in multipath, n=1,2,3 ..., m；
If identical, 0≤t of current symbol time≤TsInterior, digital signal processing unit 1 controls and receives switch 12 always
Closure.
To sum up, the present invention can stop the reception to signal, discontented when satisfaction is difficult to the existence condition of resoluting signal
Foot is normally carried out signal reception when being difficult to the existence condition of resoluting signal, and then self-interference and removing effectively is inhibited to be difficult to point
It distinguishes signal, is conducive to the reception of useful signal；Simultaneously as be difficult to resoluting signal there are the time is very short, the scheme of the application
There is no excessive influence to useful signal is received.
The above is a preferred embodiment of the present invention, it should be understood that the present invention is not limited to shape described herein
Formula should not be viewed as excluding other embodiments, and can be used for other combinations, modification and environment, and can be in this paper institute
It states in contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And what those skilled in the art were carried out
Modifications and changes do not depart from the spirit and scope of the present invention, then all should be within the scope of protection of the appended claims of the present invention.
Claims (6)
1. inhibiting system with frequency self-interference while a kind of removal is difficult to resoluting signal, it is characterised in that: at digital signal
Manage unit (1), emitting module, receiving unit, transmitting antenna (6), receiving antenna (8) and disturbance reconstruction unit (7)；The transmitting
The input terminal of component is connect with digital signal processing unit (1), the output end of emitting module respectively with transmitting antenna (6) and interference
Reconstruction unit (7) connection；The output end of the disturbance reconstruction unit (7) and receiving antenna (8) is connect with receiving unit, described
The output end of receiving unit is connect with digital signal processing unit (1)；The digital signal processing unit (1) is gone back and receiving unit
Control signal connection；
The digital signal processing unit (1) is transferred to emitting module and is handled, simultaneously for generating baseband digital signal
Receiving unit is controlled, the signal of receiving unit output is received；
The emitting module, for carrying out DA conversion, up-conversion to the baseband digital signal from digital signal processing unit (1)
And enhanced processing, and by the way that transmitting antenna (6) will treated that signal launches outward, while will treated that signal is transferred to is dry
Reconstruction unit (7) are disturbed, provide local self-interference information for disturbance reconstruction unit (7)；
The disturbance reconstruction unit (7), the local self-interference information for being provided according to emitting module are rebuild local self-interference and are supported
Disappear signal, and is transferred to receiving unit；
The receiving unit, the signal for exporting to receiving antenna (8) receive, and in digital signal processing unit (1)
Control under, using local self-interference cancellation signal, local self-interference is carried out to the signal of receiving antenna (8) output and is inhibited, then
After removal is difficult to resoluting signal, obtained signal is subjected to down coversion and analog-to-digital conversion process, and be transferred to Digital Signal Processing
Unit (1).
2. inhibiting system, feature with frequency self-interference while a kind of removal according to claim 1 is difficult to resoluting signal
Be: the emitting module includes DAC module (2), up-converter module (3), amplification module (4) and coupler (5)；The DAC
The input terminal of module (2) is connect with digital signal processing unit (1), and the output end of DAC module (2) passes sequentially through up-converter module
(3) connect with amplification module (4), the output end of the amplification module (4) by coupler respectively with transmitting antenna (6) and interference
Reconstruction unit (7) connection.
3. inhibiting system, feature with frequency self-interference while a kind of removal according to claim 1 is difficult to resoluting signal
Be: the receiving unit includes combiner (9), receives switch (12), down conversion module (10) and ADC module (11)；It is described
The input terminal of combiner (9) is connect with disturbance reconstruction unit (7) and receiving antenna (8) respectively, and the output end of combiner successively leads to
Reception switch (12), down conversion module (10) and ADC module (11) is crossed to connect with digital signal processing unit (1)；The reception
The control signal of switch (12) is connect with digital signal processing unit.
4. inhibiting system, feature with frequency self-interference while a kind of removal according to claim 3 is difficult to resoluting signal
Be: the digital signal processing unit (1) includes:
Signal transmitting and receiving module is transferred to emitting module and is handled, and export to receiving unit for generating baseband digital signal
Signal received；
Condition determining module, for determining the existence condition for being difficult to resoluting signal；
Switch control unit, switch control unit, for judging that being difficult to resoluting signal currently whether there is, and be difficult to resoluting signal
In the presence of, it controls and receives switch and disconnects, stop receiving signal, in the absence of being difficult to resoluting signal, control and receive switch and close
It closes, is normally carried out signal reception, and then realize the removal for being difficult to resoluting signal.
5. a kind of remove while being difficult to resoluting signal with frequency self-interference suppressing method, it is characterised in that: the following steps are included:
S1. digital signal processing unit (1) generates baseband digital signal, is transferred to after DAC module (2) converted, through upper change
Frequency module (3) and amplifier (4) are sent into coupler (5), export two paths of signals by coupler (5), all the way emitted antenna (6) to
Outer transmitting is transferred to disturbance reconstruction unit (7) as local self-interference information all the way；
S2. the local self-interference information that disturbance reconstruction unit (7) is provided according to emitting module rebuilds self-interference signal and is transferred to conjunction
Road device (9)；
S3. combiner (9) using rebuild self-interference signal to self-interference signal present in receiving antenna (8) output signal into
Row inhibits, and the received switch (12) of the signal after inhibition, down conversion module (10) and ADC module (11) are transferred to digital letter
Number processing unit (1)；
S4. digital signal processing unit (1) judgement, which is difficult to resoluting signal, currently whether there is, if being difficult to resoluting signal presence, control
System receives switch (12) and disconnects, and stops receiving signal, be not present if being difficult to resoluting signal, controls and receives switch (12) closure,
It is normally carried out signal reception, and then realizes the removal for being difficult to resoluting signal.
With frequency self-interference suppressing method, feature while 6. a kind of removal according to claim 5 is difficult to resoluting signal
Be: the step S4 includes:
S401. it sets self-interference signal to be made of the sum of distinguishable multipath component of M item, wherein the m articles distinguishable multipath is by inseparable
The N distinguishedmSingle sub path composition, NmThe collection of the time delay composition of single sub path is combined intoThe self-interference received
Signal are as follows:
Wherein, fcFor carrier frequency, am,nFor the amplitude of the nth subpath in the m articles multipath, θm,nFor in the m articles multipath
N single sub path phase shift, u (t) are the symbol that emitting module is sent, and z (t) is white Gaussian noise, without loss of generality, it is believed that work as former code
The duration of member is 0≤t≤Ts, TsFor symbol width；
By sine wave composition principle, if current symbol and previous symbol are different, in current symbol spaced time
Interior, in the m articles distinguishable multipath NmSingle sub path forms NmSynthesis sine；Due to this NmThe maximum delay of single sub path
It is far smaller than a symbol width T with the difference of minimal time delays, it may be assumed that
Because of N before thism- 1 sine wave continues total time as TmIt is very small, it is unable to receiving end resolution, so rebuilding in interference signal
When, a sine wave r can only be generated by a tapm(t) rebuild and offset the m articles multipath signal, that is,
WhereinTherefore, the m articles multipath, which exists, offsets remnants:
That is, if a upper symbol and current symbol difference, τm,min≤t≤τm,min+Tm, m=1,2 ..., the M period
Multipath self-interference can not be cancelled, therefore determine and be difficult to the existence condition of resoluting signal:
Current symbol is different from a upper symbol and τm,min≤t≤τm,min+Tm, m=1,2 ..., M；
S402. it sets at the beginning of current symbol as t=0, end time t=Ts, judge the currently transmitted symbol of emitting module
It is whether identical with previous symbol:
If it is different, then digital signal processing unit (1) controls and receives the time of switch (12) disconnection are as follows:
τm,min≤t≤τm,min+Tm, m=1,2 ... M；
Remaining time figure signal processing unit (1) controls and receives switch (12) closure, in which:
τm,nIt is distinguishable for the m articles
The time delay of nth subpath in multipath, n=1,2,3 ..., m；
If identical, 0≤t of current symbol time≤TsInterior, digital signal processing unit (1) controls and receives switch (12) always
Closure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910636155.7A CN110365348B (en) | 2019-07-15 | 2019-07-15 | System and method for removing signals difficult to distinguish and simultaneously inhibiting same-frequency self-interference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910636155.7A CN110365348B (en) | 2019-07-15 | 2019-07-15 | System and method for removing signals difficult to distinguish and simultaneously inhibiting same-frequency self-interference |
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| Publication Number | Publication Date |
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| CN110365348A true CN110365348A (en) | 2019-10-22 |
| CN110365348B CN110365348B (en) | 2021-04-13 |
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| CN201910636155.7A Active CN110365348B (en) | 2019-07-15 | 2019-07-15 | System and method for removing signals difficult to distinguish and simultaneously inhibiting same-frequency self-interference |
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| CN114336050A (en) * | 2022-03-04 | 2022-04-12 | 中国人民解放军海军工程大学 | Multi-mode field cancellation coupling interference suppression method |
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| CN114336050A (en) * | 2022-03-04 | 2022-04-12 | 中国人民解放军海军工程大学 | Multi-mode field cancellation coupling interference suppression method |
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