CN107547105A - It is a kind of to be used to offset the full duplex radio frequency self-interference suppressing method that differentiate multipath - Google Patents
It is a kind of to be used to offset the full duplex radio frequency self-interference suppressing method that differentiate multipath Download PDFInfo
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Abstract
It is used to offset the full duplex radio frequency self-interference suppressing method that can not differentiate multipath the invention discloses a kind of, comprises the following steps：S1. before co-channel full duplex communication simultaneously is carried out, measurement identification self-interference channel can not differentiate the time delay distribution of multipath；S2. suppress tap framework for the distribution of multipath time delay that can not differentiate of identification, arrangement radio frequency self-interference, complete the configuration of self-interference cancellation device；S3. model is suppressed using the self-interference cancellation device structure full duplex radio frequency self-interference of configuration, completing self-interference based on the model during full-duplex communication suppresses.The present invention is designed for that 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 field, is used to offset complete pair that can not differentiate multipath more particularly to a kind of
Work radio frequency self-interference suppressing method.
Background technology
The limitation that co-channel full duplex technological break-through simultaneously existing time division duplex and FDD utilize to running time-frequency resource, tool
There is the ability of one times of spectrum efficiency of lifting.Because local transmitter and receiver are received and dispatched in the identical frequency of same time simultaneously,
The transmission signal of local transmitter can cause strong self-interference to local receiver, and to ensure proper communication, receiver is needed to certainly
Interference is effectively suppressed.
The multipath that can not differentiate that traditional radio frequency self-interference cancellation framework is not directed in channel is specially designed, but
According to the communication theory of classics, it is a plurality of distinguishable multipath that can not differentiate multipath approximate merging, carries out AF panel, does not examine
Consider the influence that can not differentiate multipath in self-interference suppression, and then have ignored in channel and can not differentiate multipath so that finally take
The Radio frequency interference rejection ability obtained is limited.
The content of the invention
It is used to offset complete pair that can not differentiate multipath 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 suppress the multipath signal that can not differentiate in radio frequency self-interference, lifting full duplex radio frequency is certainly
Interference rejection capability.
The purpose of the present invention is achieved through the following technical solutions：It is a kind of to be used to offset complete pair that differentiate multipath
Work radio frequency self-interference suppressing method, comprises the following steps：
S1. before co-channel full duplex communication simultaneously is carried out, measurement identification self-interference channel can not differentiate the time delay of multipath
Distribution；Wherein, the step S1 includes following sub-step：S101. before co-channel full duplex communication simultaneously is carried out, distal end is launched
Machine is in non-working condition, and synchronizing sequence is placed in transmission signal frame structure by local transmitter；S102. local receiver receives
To after the self-interference signal locally launched, the signal received is handled, obtains the estimate C (τ) of time-delay deviation；
S103. according to dependent threshold P set in advance, judge to differentiate the scope of Multipath distribution for τ ∈ { τ | C (τ) >=P }.
S2. suppress tap framework for the distribution of multipath time delay that can not differentiate of identification, arrangement radio frequency self-interference, complete 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 individual tap, complete self-interference cancellation device
Configuration.
S3. model is suppressed using the self-interference cancellation device structure full duplex radio frequency self-interference of configuration, in full-duplex communication
Self-interference is completed in journey based on the model to suppress.Specifically, the step S3 includes following sub-step：S301. described in certainly
Interference offset device, structure full duplex radio frequency self-interference suppress model；S302. described full duplex radio frequency self-interference is utilized to suppress mould
Type, during full-duplex communication, realize that the full duplex radio frequency self-interference that can not differentiate multipath suppresses.
Preferably, the step S102 includes：It is right after local receiver receives to the self-interference signal locally launched
The signal received carries out A/D conversion and down-converted；The signal obtained to down-converted carries out down-sampling, and will be local
It is related that the synchronizing sequence of storage and the signal that down-sampling obtains enter line slip, completes pseudo- synchro measure, obtains estimating for time-delay deviation
Evaluation C (τ)；
Preferably, the characteristics of Disjunct distribution is presented in the scope 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 transmission 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 individual tap, each tap includes
One delayer, a phase shifter and an attenuator, the input of the delayer access local transmission signal, delayer
Output end is connected to first adder after passing sequentially through phase shifter, attenuator.
Preferably, the self-interference built in step S301, which suppresses model, to be included：Emitter, receiver, coupler, isolation
Device, full-duplex antenna, second adder, adaptive-filtering module and the self-interference cancellation device；
The output end of emitter 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 connected by isolator with full-duplex antenna, and the second input of second adder with doing certainly
The output end connection of Canceller is disturbed, the output end of second adder is connected with receiver；The input of the adaptive-filtering module
End is connected with receiver, and the output end of adaptive-filtering module and coupler is connected with self-interference cancellation device.
Preferably, the step S302 includes following sub-step：
Local transmission signal is passed sequentially through coupler by emitter, isolator is transferred to full-duplex antenna, while coupler
Local transmission signal is transferred to the self-interference cancellation device；
Local transmission 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 being received to remote signaling, the signal output that isolator receives antenna gives 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
Suppression is disturbed, and the signal for suppressing to obtain is transferred to receiver；
Adaptive-filtering module is handled according to traditional adaptive filter algorithm the signal that receiver exports, and according to
Result is adjusted to 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 invention are as follows：The present invention is designed for that can not differentiate multipath in self-interference channel, effectively suppression
Multipath signal can not be differentiated by having made in radio frequency self-interference, improve full duplex radio frequency self-interference rejection ability.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is the self-interference cancellation device principle schematic of the present invention；
The full duplex radio frequency self-interference that Fig. 3 is the present invention suppresses model schematic.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to
It is as described below.
As shown in figure 1, a kind of be used to offset the full duplex radio frequency self-interference suppressing method that can not differentiate multipath, including it is following
Step：
S1. before co-channel full duplex communication simultaneously is carried out, measurement identification self-interference channel can not differentiate the time delay of multipath
Distribution；
Due to being carried out before step S1 at the same time co-channel full duplex communication, therefore only local transmitter works, remote target
Emitter does not work, therefore the interference signal only locally launched that local receiver receives, in this step, time delay
Distribution measuring, optional method have the Wiener filtering based on all-digital phase-locked loop, the filtering of extension karr ripple, pseudo-code to slide correlation 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 scope, without excessively accurate.
Specifically, the step S1 includes following sub-step：S101. before co-channel full duplex communication simultaneously is carried out, far
End emitter is in non-working condition, and synchronizing sequence is placed in transmission signal frame structure by local transmitter；S102. local reception
After machine receives the self-interference signal locally launched, the signal received is handled, obtains the estimate C of time-delay deviation
(τ)；S103. according to dependent threshold P set in advance, judge to differentiate the scope of Multipath distribution for τ ∈ { τ | C (τ) >=P },
The scope is the time delay distribution that can not differentiate multipath.
Wherein, the step S102 includes：After local receiver receives to the self-interference signal locally launched, docking
The signal received carries out A/D conversion and down-converted；The signal obtained to down-converted carries out down-sampling, and will locally deposit
It is related that the synchronizing sequence of storage and the signal that down-sampling obtains enter line slip, completes pseudo- synchro measure, obtains the estimation of time-delay deviation
Value C (τ)；
S2. suppress tap framework for the distribution of multipath time delay that can not differentiate of identification, arrangement radio frequency self-interference, complete from dry
Disturb the configuration of Canceller；
Generally, multiple obstacles in self-interference channel be present, self-interference channel is typical multipath channel, described to differentiate
The characteristics of Disjunct distribution is presented in the scope 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 individual tap, complete self-interference cancellation device
Configuration.
As shown in Fig. 2 in embodiments herein, the self-interference cancellation device of configuration includes first adder and N number of taken out
Head group, each tap group correspond to a time delay section Ai, after each tap group of local transmission 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 individual tap, each take out
Head includes a delayer, a phase shifter and an attenuator, and the input of the delayer accesses local transmission 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 waste.
S3. model is suppressed using the self-interference cancellation device structure full duplex radio frequency self-interference of configuration, in full-duplex communication
Self-interference is completed in journey based on the model to suppress.Specifically, the step S3 includes following sub-step：S301. described in certainly
Interference offset device, structure full duplex radio frequency self-interference suppress model；S302. described full duplex radio frequency self-interference is utilized to suppress mould
Type, during full-duplex communication, realize that the full duplex radio frequency self-interference that can not differentiate multipath suppresses.
Include as shown in figure 3, the self-interference built in step S301 suppresses model：Emitter, receiver, coupler, every
From device, full-duplex antenna, second adder, adaptive-filtering module and the self-interference cancellation device；The output end of emitter 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 leads to
Isolator to be crossed to be connected with full-duplex antenna, the second input of second adder is connected with the output end of self-interference cancellation device, the
The output end of two adders is connected with receiver；The input of the adaptive-filtering module is connected with receiver, adaptive filter
Ripple module and the output end of coupler are connected with self-interference cancellation device.In embodiments herein, the emitter includes
DAC module and radio-frequency module, local transmission signal are transferred to complete double after DA is converted after radio-frequency module, coupler, isolator
Work antenna is launched；The receiver includes ADC and radio-frequency module, and second adder utilizes self-interference cancellation signal,
After the signal that is received to full-duplex antenna carries out AF panel, then through radio-frequency module ADC is transferred to, the letter that will be received
Number it is AD converted.
Accordingly, the step S302 includes following sub-step：Emitter by local transmission signal pass sequentially through coupler,
Isolator is transferred to full-duplex antenna, while local transmission signal is transferred to the self-interference cancellation device by coupler；Using certainly
Interference offset device is handled local transmission signal, obtains self-interference cancellation signal, and self-interference cancellation signal is transferred to
Second adder；During being received to remote signaling, isolator adds the signal output that antenna receives 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
Suppress, and the signal for suppressing to obtain is transferred to receiver；The signal that adaptive-filtering module exports to receiver is according to tradition
Adaptive filter algorithm is handled, and according to 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 suppresses in model,
The input of each tap group is connected with the coupler in self-interference cancellation device, the output end of each tap group with
First adder connects；The output end (output end as whole self-interference cancellation device) of first adder and second addition
The second input connection of device；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 (10)
1. a kind of be used to offset the full duplex radio frequency self-interference suppressing method that can not differentiate multipath, it is characterised in that：Including following
Step：
S1. before co-channel full duplex communication simultaneously is carried out, measurement identification self-interference channel can not differentiate the time delay distribution of multipath；
S2. suppress tap framework for the distribution of multipath time delay that can not differentiate of identification, arrangement radio frequency self-interference, complete self-interference and support
Disappear the configuration of device；
S3. model is suppressed using the self-interference cancellation device structure full duplex radio frequency self-interference of configuration, during full-duplex communication
Self-interference is completed based on the model to suppress.
2. a kind of full duplex radio frequency self-interference suppressing method for being used for counteracting and can not differentiating multipath according to claim 1,
It is characterized in that：The step S1 includes following sub-step：
S101. before co-channel full duplex communication simultaneously is carried out, distant transmitter is in non-working condition, and local transmitter will be same
Step sequence is placed in transmission signal frame structure；
S102. after local receiver receives the self-interference signal locally launched, the signal received is handled, during acquisition
Prolong the estimate C (τ) of deviation；
S103. according to dependent threshold P set in advance, the scope for judging that Multipath distribution can not be differentiated is τ ∈ { τ C (τ) >=P }.
3. a kind of full duplex radio frequency self-interference suppressing method for being used for counteracting and can not differentiating multipath according to claim 2,
It is characterized in that：The step S102 includes：
After local receiver receives to the self-interference signal locally launched, the signal that receives is carried out A/D conversion and under
Frequency-conversion processing；
The signal obtained to down-converted carries out down-sampling, and the signal that the synchronizing sequence being locally stored and down-sampling are obtained
Enter line slip correlation, complete pseudo- synchro measure, obtain the estimate C (τ) of time-delay deviation.
4. a kind of full duplex radio frequency self-interference suppressing method for being used for counteracting and can not differentiating multipath according to claim 1,
It is characterized in that：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 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 individual tap, complete self-interference cancellation device
Configuration.
5. a kind of full duplex radio frequency self-interference suppressing method for being used for counteracting and can not differentiating multipath according to claim 4,
It is characterized in that：The characteristics of Disjunct distribution is presented in the scope τ ∈ { τ | C (τ) >=P } that Multipath distribution can not be differentiated, 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。
6. a kind of full duplex radio frequency self-interference suppressing method for being used for counteracting and can not differentiating multipath according to claim 4,
It is characterized in that：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 transmission signal input is handled, it is transferred to first adder and enters
Row add operation, obtain self-interference cancellation signal.
7. a kind of full duplex radio frequency self-interference suppressing method for being used for counteracting and can not differentiating multipath according to claim 4,
It is characterized in that：Each time delay section AiCorresponding MiIn individual tap, each tap include a delayer, a phase shifter and
One attenuator, the input of the delayer access local transmission signal, and the output end of delayer passes sequentially through phase shifter, declined
First adder is connected to after subtracting device.
8. a kind of full duplex radio frequency self-interference suppressing method for being used for counteracting and can not differentiating multipath according to claim 1,
It is characterized in that：The step S3 includes following sub-step：
S301. the self-interference cancellation device is utilized, structure full duplex radio frequency self-interference suppresses model；
S302. described full duplex radio frequency self-interference is utilized to suppress model, during full-duplex communication, realization can not differentiate more
The full duplex radio frequency self-interference in footpath suppresses.
9. a kind of full duplex radio frequency self-interference suppressing method for being used for counteracting and can not differentiating multipath according to claim 8,
It is characterized in that：The self-interference built in step S301, which suppresses model, to be included：It is emitter, receiver, coupler, isolator, complete
Duplexed antenna, second adder, adaptive-filtering module and the self-interference cancellation device；
The output end of emitter passes sequentially through coupler, isolator is connected to full-duplex antenna, carries out signal transmitting；Described second
The first input end of adder is connected by isolator with full-duplex antenna, and the second input and the self-interference of second adder are supported
Disappear the output end connection of device, and the output end of second adder is connected with receiver；The input of the adaptive-filtering module with
Receiver is connected, and the output end of adaptive-filtering module and coupler is connected with self-interference cancellation device.
10. a kind of full duplex radio frequency self-interference suppressing method for being used for counteracting and can not differentiating multipath according to claim 8,
It is characterized in that：The step S302 includes following sub-step：
Local transmission signal is passed sequentially through coupler by emitter, isolator is transferred to full-duplex antenna, while coupler incite somebody to action this
Ground transmission signal is transferred to the self-interference cancellation device；
Local transmission 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 being received to remote signaling, the signal output that isolator receives antenna is to second adder；
Self-interference cancellation signal and signal from isolator are carried out add operation by second adder, realize that the machine self-interference presses down
System, and the signal for suppressing to obtain is transferred to receiver；
Adaptive-filtering module is handled according to traditional adaptive filter algorithm the signal that receiver exports, 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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