CN107547105B - It is a kind of for offsetting the full duplex radio frequency self-interference suppressing method that can not differentiate multipath - Google Patents
It is a kind of for offsetting the full duplex radio frequency self-interference suppressing method that can not differentiate multipath Download PDFInfo
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Abstract
The invention discloses a kind of for offsetting the full duplex radio frequency self-interference suppressing method that can not differentiate multipath, comprising the following steps: for S1. before carrying out co-channel full duplex communication simultaneously, measurement identification self-interference channel can not differentiate the time delay distribution of multipath；S2. for the distribution of multipath time delay that can not differentiate of identification, arrangement radio frequency self-interference inhibits tap framework, completes the configuration of self-interference cancellation device；S3. inhibit model using the self-interference cancellation device building full duplex radio frequency self-interference of configuration, complete self-interference inhibition based on this model during full-duplex communication.The present invention is designed for can not differentiate multipath in self-interference channel, and multipath signal can not be differentiated by effectively inhibiting in radio frequency self-interference, improve full duplex radio frequency self-interference rejection ability.
Description
Technical field
The present invention relates to full duplex AF panel fields, can not differentiate the complete double of multipath for offsetting more particularly to a kind of
Work radio frequency self-interference suppressing method.
Background technique
The limitation of the existing time division duplex of co-channel full duplex technological break-through simultaneously and frequency division duplex to the time-frequency utilization of resources, tool
There is the ability for promoting one times of spectrum efficiency.Since local transmitter and receiver are received and dispatched simultaneously in same time identical frequency,
The transmitting signal of local transmitter can cause strong self-interference to local receiver, and to guarantee normal communication, receiver is needed to certainly
Interference is effectively inhibited.
Traditional radio frequency self-interference cancellation framework is not directed to the multipath that can not differentiate in channel and is specially designed, but
According to classical communication theory, can not differentiate multipath approximate merging is a plurality of distinguishable multipath, carries out AF panel, does not examine
Consider the influence that can not differentiate multipath in self-interference inhibition, and then have ignored in channel and can not differentiate multipath, so that finally taking
The radio frequency interference rejection ability obtained is limited.
Summary of the invention
The complete double of multipath can not be differentiated for offsetting it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of
Work radio frequency self-interference suppressing method effectively inhibits the multipath signal that can not differentiate in radio frequency self-interference, promotes full duplex radio frequency certainly
Interference rejection capability.
The purpose of the present invention is achieved through the following technical solutions: a kind of to differentiate the complete double of multipath for offsetting
Work radio frequency self-interference suppressing method, comprising the following steps:
S1. before carrying out co-channel full duplex communication simultaneously, measurement identification self-interference channel can not differentiate the time delay of multipath
Distribution；Wherein, the step S1 includes following sub-step: before carrying out co-channel full duplex communication simultaneously, distal end emits S101.
Machine is in non-working condition, and synchronizing sequence is placed in transmitting signal frame structure by local transmitter；S102. local receiver receives
To after the self-interference signal locally emitted, the signal received is handled, obtains the estimated value C (τ) of time-delay deviation；
S103. according to preset dependent threshold P, determine can not to differentiate the range of Multipath distribution for τ ∈ { τ | C (τ) >=P }.
S2. for the distribution of multipath time delay that can not differentiate of identification, arrangement radio frequency self-interference inhibits tap framework, completes from dry
Disturb the configuration of Canceller；Wherein, the step S2 includes following sub-step:
S201. according to time delay distribution feature in τ ∈ { τ | C (τ) >=P }, by the time delay stroke in set A={ τ | C (τ) >=P }
It is divided into N number of subset A1,A2,...,AN, each subset meets Ai∩Aj=φ, i, j=1,2 ..., N and A1∪A2∪…∪AN=A；
S202. according to the time delay section A that can not differentiate Multipath distributioni, i=1,2 ..., N determine the tap distribution of self-interference cancellation device
Time range, in each time delay section AiInside targetedly arrangement includes MiThe tap group of a tap completes self-interference cancellation device
Configuration.
S3. inhibit model using the self-interference cancellation device building full duplex radio frequency self-interference of configuration, in full-duplex communication
Self-interference inhibition is completed in journey based on this model.Specifically, the step S3 includes following sub-step: S301. utilization is described certainly
Interference offset device, building full duplex radio frequency self-interference inhibit model；S302. inhibit mould using the full duplex radio frequency self-interference
Type realizes that the full duplex radio frequency self-interference that can not differentiate multipath inhibits during full-duplex communication.
Preferably, the step S102 includes: after local receiver receives the self-interference signal locally emitted, right
The signal received carries out A/D transformation and down-converted；Down-sampling is carried out to the signal that down-converted obtains, and will be local
It is related that the synchronizing sequence of storage and the signal that down-sampling obtains carry out sliding, completes pseudo- synchro measure, obtains estimating for time-delay deviation
Evaluation C (τ)；
Preferably, the characteristics of Disjunct distribution is presented in the range τ ∈ { τ | C (τ) >=P } that can not differentiate Multipath distribution, one
Cluster can not differentiate Multipath distribution in delay, τ1≤τ≤τ2On, another cluster can not differentiate Multipath distribution in τ3≤τ≤τ4On, wherein τ1
< τ2< τ3< τ4。
Preferably, the self-interference cancellation device configured in the step S202 includes first adder and N number of tap group, each
Tap group corresponds to a time delay section Ai, after each tap group of local transmitting signal input is handled, it is transferred to the first addition
Device carries out add operation, obtains self-interference cancellation signal.Each time delay section AiCorresponding MiIn a tap, each tap includes
One delayer, a phase shifter and an attenuator, the local transmitting signal of input terminal access of the delayer, delayer
Output end is connected to first adder after passing sequentially through phase shifter, attenuator.
Preferably, it includes: transmitter, receiver, coupler, isolation that the self-interference constructed in step S301, which inhibits model,
Device, full-duplex antenna, second adder, adaptive-filtering module and the self-interference cancellation device；
The output end of transmitter passes sequentially through coupler, isolator is connected to full-duplex antenna, carries out signal transmitting；It is described
The first input end of second adder is connect by isolator with full-duplex antenna, and the second input terminal of second adder is dry with oneself
The output end connection of Canceller is disturbed, the output end of second adder is connect with receiver；The input of the adaptive-filtering module
End is connect with receiver, and the output end of adaptive-filtering module and coupler is connect with self-interference cancellation device.
Preferably, the step S302 includes following sub-step:
By local transmitting, signal passes sequentially through coupler to transmitter, isolator is transferred to full-duplex antenna, while coupler
Local transmitting signal is transferred to the self-interference cancellation device；
Local transmitting signal is handled using self-interference cancellation device, obtains self-interference cancellation signal, and by self-interference
Offseting signal is transferred to second adder；
During carrying out received to remote signaling, the signal that isolator receives antenna is exported to the second addition
Device；
Self-interference cancellation signal and signal from isolator are carried out add operation by second adder, realize the machine from dry
Inhibition is disturbed, and obtained signal will be inhibited to be transferred to receiver；
Adaptive-filtering module handles the signal that receiver exports according to traditional adaptive filter algorithm, and according to
Processing result is adjusted the parameter configuration value of phase shifter in each tap in self-interference cancellation device, attenuator, so that interference
Power is minimum.
The beneficial effects of the present invention are: the present invention is designed for can not differentiate multipath in self-interference channel, effectively press down
Multipath signal can not be differentiated by having made in radio frequency self-interference, improve full duplex radio frequency self-interference rejection ability.
Detailed description of the invention
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is self-interference cancellation device schematic illustration of the invention；
Fig. 3 is that full duplex radio frequency self-interference of the invention inhibits model schematic.
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 for offsetting the full duplex radio frequency self-interference suppressing method that can not differentiate multipath including following
Step:
S1. before carrying out co-channel full duplex communication simultaneously, measurement identification self-interference channel can not differentiate the time delay of multipath
Distribution；
Due to carrying out before step S1 at the same time co-channel full duplex communication, therefore only local transmitter works, remote target
Transmitter does not work, therefore the interference signal only locally emitted that local receiver receives, in this step, time delay
Distribution measuring, optional method have Wiener filtering, the filtering of extension karr wave, pseudo-code sliding correlation based on all-digital phase-locked loop etc.
Method carries out relevant Delay Estima-tion；In this application, using the PN synchronization method based on training sequence；It may be noted that
It is that distribution of multipath time delay measurement herein only needs to estimate a time delay distribution range, without excessively accurate.
Specifically, the step S1 includes following sub-step: S101. is before carrying out co-channel full duplex communication simultaneously, far
End transmitter is in non-working condition, and synchronizing sequence is placed in transmitting signal frame structure by local transmitter；S102. local reception
After machine receives the self-interference signal locally emitted, the signal received is handled, obtains the estimated value C of time-delay deviation
(τ)；S103. according to preset dependent threshold P, determine can not to differentiate the range of Multipath distribution for τ ∈ { τ | C (τ) >=P },
The range is the time delay distribution that can not differentiate multipath.
Wherein, the step S102 includes: docking after local receiver receives the self-interference signal locally emitted
The signal received carries out A/D transformation and down-converted；Down-sampling is carried out to the signal that down-converted obtains, and will locally be deposited
It is related that the synchronizing sequence of storage and the signal that down-sampling obtains carry out sliding, completes pseudo- synchro measure, obtains the estimation of time-delay deviation
Value C (τ)；
S2. for the distribution of multipath time delay that can not differentiate of identification, arrangement radio frequency self-interference inhibits tap framework, completes from dry
Disturb the configuration of Canceller；
In general, self-interference channel is typical multipath channel there are multiple obstacles in self-interference channel, it is described to differentiate
The characteristics of Disjunct distribution is presented in the range τ ∈ { τ | C (τ) >=P } of Multipath distribution, cluster can not differentiate Multipath distribution in delay, τ1≤
τ≤τ2On, another cluster can not differentiate Multipath distribution in τ3≤τ≤τ4On, wherein τ1< τ2< τ3< τ4。
Specifically, the step S2 includes following sub-step:
S201. according to time delay distribution feature in τ ∈ { τ | C (τ) >=P }, by the time delay stroke in set A={ τ | C (τ) >=P }
It is divided into N number of subset A1,A2,...,AN, each subset meets Ai∩Aj=φ, i, j=1,2 ..., N and A1∪A2∪…∪AN=A；
S202. according to the time delay section A that can not differentiate Multipath distributioni, i=1,2 ..., N determine the tap distribution of self-interference cancellation device
Time range, in each time delay section AiInside targetedly arrangement includes MiThe tap group of a tap completes self-interference cancellation device
Configuration.
As shown in Fig. 2, the self-interference cancellation device of configuration includes first adder and N number of pumping in embodiments herein
Head group, each tap group correspond to a time delay section Ai, after each tap group of local transmitting signal input is handled, it is transferred to
First adder carries out add operation, obtains self-interference cancellation signal.Each time delay section AiCorresponding MiIn a tap, each pumping
Head includes a delayer, a phase shifter and an attenuator, and the input terminal access of the delayer is local to emit signal,
The output end of delayer is connected to first adder after passing sequentially through phase shifter, attenuator.The self-interference cancellation device of configuration is compared
In traditional approach, the distribution of tap has more specific aim, does not easily cause tap to waste.
S3. inhibit model using the self-interference cancellation device building full duplex radio frequency self-interference of configuration, in full-duplex communication
Self-interference inhibition is completed in journey based on this model.Specifically, the step S3 includes following sub-step: S301. utilization is described certainly
Interference offset device, building full duplex radio frequency self-interference inhibit model；S302. inhibit mould using the full duplex radio frequency self-interference
Type realizes that the full duplex radio frequency self-interference that can not differentiate multipath inhibits during full-duplex communication.
As shown in figure 3, the self-interference that is constructed in step S301 inhibit model include: transmitter, receiver, coupler, every
From device, full-duplex antenna, second adder, adaptive-filtering module and the self-interference cancellation device；The output end of transmitter according to
It is secondary that full-duplex antenna is connected to by coupler, isolator, carry out signal transmitting；The first input end of the second adder is logical
Isolator to be crossed to connect with full-duplex antenna, the second input terminal of second adder is connect with the output end of self-interference cancellation device, the
The output end of two adders is connect with receiver；The input terminal of the adaptive-filtering module is connect with receiver, adaptive to filter
The output end of wave module and coupler is connect with self-interference cancellation device.In embodiments herein, the transmitter includes
DAC module and radio-frequency module, the local signal that emits are transferred to complete double after DA is converted after radio-frequency module, coupler, isolator
Work antenna is emitted；The receiver includes ADC module and radio-frequency module, and second adder utilizes self-interference cancellation signal,
After the signal received to full-duplex antenna carries out AF panel, then through radio-frequency module it is transferred to ADC module, the letter that will be received
It number is AD converted.
Correspondingly, the step S302 includes following sub-step: transmitter will local transmitting signal pass sequentially through coupler,
Isolator is transferred to full-duplex antenna, while local transmitting signal is transferred to the self-interference cancellation device by coupler；Using certainly
Interference offset device handles local transmitting signal, obtains self-interference cancellation signal, and self-interference cancellation signal is transferred to
Second adder；During carrying out received to remote signaling, the signal that isolator receives antenna is exported to be added to second
Musical instruments used in a Buddhist or Taoist mass；Self-interference cancellation signal and signal from isolator are carried out add operation by second adder, realize the machine self-interference
Inhibit, and obtained signal will be inhibited to be transferred to receiver；The signal that adaptive-filtering module exports receiver is according to tradition
Adaptive filter algorithm is handled, and according to processing result to phase shifter, attenuator in each tap in self-interference cancellation device
Parameter configuration value be adjusted so that jamming power is minimum.Duplex radio frequency self-interference constructed by step S3 inhibits in model,
The input terminal of each tap group is connect with the coupler in self-interference cancellation device, the output end of each tap group with
First adder connection；The output end (output end as entire self-interference cancellation device) and second addition of first adder
Second input terminal of device connects；To sum up, the present invention is set for that can not differentiate multipath progress self-interference cancellation device in self-interference channel
Meter, multipath signal can not be differentiated by effectively inhibiting in radio frequency self-interference, improve full duplex radio frequency self-interference rejection ability.
Claims (6)
1. a kind of for offsetting the full duplex radio frequency self-interference suppressing method that can not differentiate multipath, it is characterised in that: including following
Step:
S1. before carrying out co-channel full duplex communication simultaneously, measurement identification self-interference channel can not differentiate the time delay distribution of multipath；
The step S1 includes following sub-step:
S101. before carrying out co-channel full duplex communication simultaneously, distant transmitter is in non-working condition, and local transmitter will be same
Step sequence is placed in transmitting signal frame structure；
S102. after local receiver receives the self-interference signal locally emitted, the signal received is handled, when acquisition
Prolong the estimated value C (τ) of deviation, the step S102 includes:
After local receiver receives the self-interference signal locally emitted, to the signal that receives carry out A/D transformation and under
Frequency-conversion processing；
Down-sampling, and the signal that the synchronizing sequence being locally stored and down-sampling are obtained are carried out to the signal that down-converted obtains
It is related to carry out sliding, completes pseudo- synchro measure, obtains the estimated value C (τ) of time-delay deviation；
S103. according to preset dependent threshold P, determine can not to differentiate the range of Multipath distribution for τ ∈ { τ | C (τ) >=P }；
S2. for the distribution of multipath time delay that can not differentiate of identification, arrangement radio frequency self-interference inhibits tap framework, completes self-interference and supports
Disappear the configuration of device；The step S2 includes following sub-step:
S201. according to time delay distribution feature in τ ∈ { τ | C (τ) >=P }, the time delay in set A={ τ | C (τ) >=P } is divided into N
A subset A1,A2,...,AN, each subset meets Ai∩Aj=φ, i, j=1,2 ..., N and A1∪A2∪…∪AN=A；φ is indicated
Empty set；
S202. according to the time delay section A that can not differentiate Multipath distributioni, i=1,2 ..., N determine the tap distribution of self-interference cancellation device
Time range, in each time delay section AiInside targetedly arrangement includes MiThe tap group of a tap completes self-interference cancellation device
Configuration, wherein MiFor integer, self-interference cancellation device includes first adder and N number of tap group, and each tap group corresponds to one
A time delay section Ai, after each tap group of local transmitting signal input is handled, it is transferred to first adder and carries out add operation,
Obtain self-interference cancellation signal；
S3. inhibit model using the self-interference cancellation device building full duplex radio frequency self-interference of configuration, during full-duplex communication
Self-interference is completed based on this model to inhibit.
2. it is according to claim 1 a kind of for offsetting the full duplex radio frequency self-interference suppressing method that can not differentiate multipath,
It is characterized by: the characteristics of Disjunct distribution is presented in the range τ ∈ { τ | C (τ) >=P } that can not differentiate Multipath distribution, cluster is not
Distinguishable Multipath distribution is in delay, τ1≤τ≤τ2On, another cluster can not differentiate Multipath distribution in τ3≤τ≤τ4On, wherein τ1< τ2
< τ3< τ4。
3. it is according to claim 1 a kind of for offsetting the full duplex radio frequency self-interference suppressing method that can not differentiate multipath,
It is characterized by: each time delay section AiCorresponding MiIn a tap, each tap include a delayer, a phase shifter and
One attenuator, the local transmitting signal of input terminal access of the delayer, the output end of delayer pass sequentially through phase shifter, decline
First adder is connected to after subtracting device.
4. it is according to claim 1 a kind of for offsetting the full duplex radio frequency self-interference suppressing method that can not differentiate multipath,
It is characterized by: the step S3 includes following sub-step:
S301. the self-interference cancellation device is utilized, building full duplex radio frequency self-interference inhibits model；
S302. inhibit model using the full duplex radio frequency self-interference, during full-duplex communication, realization can not differentiate more
The full duplex radio frequency self-interference of diameter inhibits.
5. it is according to claim 4 a kind of for offsetting the full duplex radio frequency self-interference suppressing method that can not differentiate multipath,
It is characterized by: the self-interference that constructs in step S301 inhibits model includes: transmitter, receiver, coupler, isolator, complete
Duplexed antenna, second adder, adaptive-filtering module and the self-interference cancellation device；
The output end of transmitter passes sequentially through coupler, isolator is connected to full-duplex antenna, carries out signal transmitting；Described second
The first input end of adder is connect by isolator with full-duplex antenna, and the second input terminal and the self-interference of second adder are supported
Disappear the output end connection of device, and the output end of second adder connect with receiver；The input terminal of the adaptive-filtering module with
The output end of receiver connection, adaptive-filtering module and coupler is connect with self-interference cancellation device.
6. it is according to claim 4 a kind of for offsetting the full duplex radio frequency self-interference suppressing method that can not differentiate multipath,
It is characterized by: the step S302 includes following sub-step:
By local transmitting, signal passes sequentially through coupler to transmitter, isolator is transferred to full-duplex antenna, while coupler incite somebody to action this
Ground transmitting signal is transferred to the self-interference cancellation device；
Local transmitting signal is handled using self-interference cancellation device, obtains self-interference cancellation signal, and by self-interference cancellation
Signal is transferred to second adder；
During carrying out received to remote signaling, the signal that isolator receives antenna is exported to second adder；
Self-interference cancellation signal and signal from isolator are carried out add operation by second adder, realize the suppression of the machine self-interference
System, and obtained signal will be inhibited to be transferred to receiver；
Adaptive-filtering module handles the signal that receiver exports according to traditional adaptive filter algorithm, and according to processing
As a result the parameter configuration value of phase shifter in each tap in self-interference cancellation device, attenuator is adjusted, so that jamming power
It is minimum.
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| CN109274388B (en) * | 2018-09-30 | 2021-06-04 | 中国人民解放军海军工程大学 | Radio frequency cancellation device and method for digital domain interference reconstruction |
| CN116318240A (en) * | 2019-04-25 | 2023-06-23 | 华为技术有限公司 | Full duplex self-interference elimination method and device |
| CN111107027B (en) * | 2019-12-05 | 2022-06-28 | 北京航空航天大学杭州创新研究院 | High-performance same-frequency full-duplex self-interference cancellation method |
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| EP1422850A4 (en) * | 2001-08-28 | 2006-04-05 | Matsushita Electric Ind Co Ltd | Multi-pass interference removal apparatus and multi-pass interference removal method |
| US20100283665A1 (en) * | 2009-05-05 | 2010-11-11 | Imran Bashir | Mitigation of RF Oscillator Pulling through Adjustable Phase Shifting |
| CN101655546B (en) * | 2009-09-22 | 2012-02-01 | 西北工业大学 | Method for estimating satellite navigation direct signal parameter and multipath signal number and parameter |
| US8842781B2 (en) * | 2010-02-15 | 2014-09-23 | Intel Mobile Communications GmbH | Device and method for selecting a path from an estimated delay profile of a radio signal |
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