CN104469786B - A kind of LTE and WIFI cobasis station Interference Suppression System and method - Google Patents
A kind of LTE and WIFI cobasis station Interference Suppression System and method Download PDFInfo
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- CN104469786B CN104469786B CN201410724867.1A CN201410724867A CN104469786B CN 104469786 B CN104469786 B CN 104469786B CN 201410724867 A CN201410724867 A CN 201410724867A CN 104469786 B CN104469786 B CN 104469786B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/002—Mutual synchronization
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/003—Arrangements to increase tolerance to errors in transmission or reception timing
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Abstract
The invention discloses a kind of LTE and WIFI cobasis station Interference Suppression System and method, LTE transmitting antennas and the radiofrequency signal of WIFI transmitting antennas transmitting couple a and input feedback channel from its antenna opening respectively, one input terminal of LTE digital interference cancellation modules is connected with LTE radio channel, another input terminal is connect with feedback channel, and output end and the LTE of LTE digital interference cancellation modules receive baseband processing module and connect；One input terminal of WIFI digital interference cancellation modules is connected with the radio-frequency channels WIFI, another input terminal is connect with feedback channel, and output end and the WIFI of WIFI digital interference cancellation modules receive baseband processing module and connect；Feedback channel is also connect with LTE radio channel, the radio-frequency channels WIFI respectively.The present invention is by adjusting the length of cable between feedback channel and radio-frequency front-end interface, between feedback channel and IF interface, the wireless interference signal precise synchronization for making the signal that RF FEEDBACK channel is brought be received with LTE or WIFI, synchronization accuracy is improved, Interference Cancellation performance is improved.
Description
Technical field
The present invention relates to wireless communication fields, more particularly to a kind of LTE and WIFI cobasis station Interference Suppression System and side
Method.
Background technology
With the continuous development of the communication technology, communication speed is continuously improved, and band resource becomes more and more in short supply.How
Realize that higher transmission speed becomes a hot spot of industry research in limited frequency band, LTE and WIFI cobasis station AF panel are just
It is one of important branch.In order to improve capacity, for the market demand, the work of LTE and WIFI co-sited will be a kind of important
Trend.
Plan that WIFI works in 2400~2483.5MHz, not need the ISM of License according to the frequency spectrum of current country
Frequency range, and TD-LTE may operate in the E frequency ranges of 2320~2370MHz, still there is the isolation strip of 30MHz between two systems, select TD-
Channel (TD-LTE operating center frequencies 2360MHz, WIFI operating center frequency 2412MHz) most adjacent LTE and WIFI is drawn
Emit signal spectrum template, as shown in Figure 1, it can be seen that can exist with interior interference between LTE and WIFI, this can reduce them
Capacity.In the case of LTE and WIFI cobasis station, the two transceiver suffers closely, and interference signal can be much larger than useful signal.
In order to inhibit Communication Jamming, the prior art to take following several method.
One, the technical solution of the prior art one：
CIT Alcatel is that its micro-base station product proposes the autonomous interference management scheme in Microcell.It is demonstrate,proved by testing
It is bright compared with static shared interference management scheme, autonomous dynamic interference management scheme can obtain higher performance and increase
Benefit.Autonomous dynamic disturbance Managed Solution uses advanced technology, such as self-organizing network (SON) technology, automated power control, from
The enhancement type district interference coordination of dynamic reception gain control, uplink channel interference management and AT＆T Labs's innovation
(eICIC) function etc..
Interference management scheme under same frequency environment：
(1) when micro-base station recognizes that macro base station signal is weak, its power of micro-base station should be autonomous reduction；
(2) signal of micro-base station is very strong and when having flooded neighbouring macro base station, micro-base station should be able to notify its institute of mobile phone
The maximum power that can be transmitted adjusts itself sensitivity and avoids by powerful signal interference so as not to influence neighbouring macro base station；
(3) micro-base station can be found in the good covering in specified region and beyond the balance between the interference of its range.
The shortcomings that prior art one, is as follows：
Optimal energy allocation scheme is also the influence for taking a kind of round-about way to evade interference, and useless from basic
Eliminate interference.Therefore, in the case where application scenarios are severe, it will be difficult to achieve the purpose that inhibit interference.
Two, the technical solution of the prior art two：
Nokia Siemens Networks company proposes femtocell base in its femtocell (Femto) solution
The deployment special project stood needs new interference mitigation technology.The interference of femtocell derives from 6 paths：Femto base station
(uplink and downlink chain are respectively included to macro base station, macro base station to femto base station, femto base station to femto base station
Road).It is open or envelope that interference, which depends greatly on the whether shared frequency spectrum in minizone, common-channel interference and access port,
It closes.
It is similar with the prior art one, use autonomous interference management plan, this interference can be mitigated, enable operator into
The uncoordinated deployment of row.The technology of use mainly has adaptive peak power output control, macro base station to remind the UE upper limit of the power
Assist in ensuring that the band or " escape carrier " of acceptable performance and deployment-specific, it is also proposed that interference coordination in enhancement type district
(eICIC) plan, and for the adaptive antenna array of WIFI, select WIFI to transmit best signal path, avoid automatically
WIFI interference sources.
The shortcomings that prior art two, is as follows：
Equally it is the scheme using autonomous interference management, disadvantage is identical as the prior art one.
Three, the technical solution of the prior art three：
The first WIFI solutions merged entirely of industry that Huawei Company releases have the radio frequency resources such as channel, transmission power
Dynamic adjustment capability.First, in terms of automated power adjustment, watt level can be dynamically adjusted, ensures rational signal covering
And overlay region, prevent covering loophole and cross covering to generate interference, meanwhile, after neighbouring WIFI is moved, periphery WIFI is adjustable
Respective power, plugs a gap.Secondly, in automatic channel selection function, disturbed condition can be detected automatically, according to the frequency point of configuration
Number, channel selection is carried out automatically, to reduce the probability of shared channel collision.Furthermore it is possible to make full use of 11n double frequencies advantage and
The feature that 5GHz is more with respect to frequency point, interference is small, is initially accessed and uses 2.4GHz, be then switched to business on 5GHz from 2.4GHz
It goes to carry, realizes the navigation of different frequency range, to reduce interference.
Also inevitably there is air interference under WIFI and LTE Coexistence Situations, between them.In the feelings for having risk of interferences
Under condition, most directly interference removing measure is that certain frequency spectrum protection bandwidth is reserved between two wireless communication networks, this can
Farthest to reduce the generation of interference, but also result in a degree of waste of frequency resource.Specifically reserved protection band
Width, then need to be calculated according to the anti-interference ability of physical device and the disturbed condition now netted.In addition, comparing for some
Serious situation, it is necessary to consider to install filter and room for promotion isolation additional to reduce interference.
The shortcomings that prior art three, is as follows：
The methods of kinds of schemes is used to inhibit interference signal, be isolated by optimal energy allocation, space, reduce dry
Signal is disturbed, does not all eliminate interference signal from basic.And propose install additional filter scheme come eliminate interference, but it and can only
Inhibit out-of-band interference signal.
Four, the technical solution of the prior art four：
Fig. 2 is the interference cancellation systems brief configuration figure of the prior art four, have passed through two steps to the counteracting of interference signal
Suddenly：The first step rebuilds module using radio frequency interference, and time delay, amplitude and the phase by adjusting transmitting signal make it and receive interference
Then signal is offseted with width reverse phase by adder realization；Second step, after interference signal is by A/D, by the way that end group will be emitted
Band signal carries out digital interference counteracting as reconstruction signal and interference signal.
The shortcomings that prior art four, is as follows：
In the program, digital interference is to be introduced directly into reception end group by transmitting terminal base band when offsetting the reconstruction signal used
Band, such signal have ignored the non-linear and phase noise of radio-frequency channel introducing, thus can not be to the non-linear of interference signal
It mutually makes an uproar and is offset, cancelling capabilities will decline.
Five, the technical solution of the prior art five：
As shown in figure 3, the prior art five and the structure of the prior art four are almost the same, only difference is that digital interference
The reconstruction signal used in counteracting is become emitting RF FEEDBACK signal from original transmitting baseband signal.The program by it is anti-
Feedthrough road simulates the radio-frequency channel of interference signal, to overcome the prior art four can not eliminate radio frequency it is non-linear with mutually make an uproar
The problem of, improve digital interference cancelling capabilities.In the program, length of cable between feedback channel and radio-frequency front-end interface and anti-
Length of cable between feedthrough road and IF interface is fixed.
The shortcomings that prior art five：
In the program, the line between length of cable and feedback channel and IF interface between feedback channel and radio-frequency front-end interface
Cable length is fixed so that feedback signal is asynchronous with signal is received, and is synchronized in numeric field, can not ensure to synchronize essence
Degree, and then cause interference with rejection decline.In addition to this, line length is non-adjustable will also lead to phase of the receiving channel with feedback channel
It makes an uproar difference, to reduce Interference Cancellation performance.
In conclusion inhibiting the prior art one, two, three of interference signal this using power control, space isolation
Indirectly reduce the scheme of interference signal, these schemes are not easy to implement in the case where environmental resource is severe.And install filter additional
Method can only inhibit band outside interference, for enter band in interference signal it is helpless.The prior art four, five uses elder generation
Into digital interference cancellation technology, the prior art four using transmitting terminal baseband signal carry out digital interference counteracting, can not inhibit to penetrate
Frequently non-linear with the influence mutually made an uproar；The prior art five carries out digital interference counteracting using transmitting radiofrequency signal, and there are synchronization accuracies
Not enough cause interference with the problem of rejection declines.Therefore, by various conditionalities, the Interference Cancellation performance of existing program is also
It is not good enough, need to propose it is a kind of can in useful signal frequency band the more efficient method for eliminating interference signal.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of LTE and WIFI cobasis station AF panel system
System and method, it is effectively existing in the case of inhibition LTE and WIFI cobasis station to interfere with each other；Before adjusting feedback channel and radio frequency
Between end interface, feedback channel and length of cable between IF interface realize the synchronous of feedback channel and receiving channel, improve and synchronize
Precision improves Interference Cancellation performance.
The purpose of the present invention is achieved through the following technical solutions：A kind of LTE and WIFI cobasis station AF panel system
System, including LTE transceiver channels and WIFI transceiver channels, LTE transceiver channels include LTE dual-mode antennas, LTE reception bandpass filterings
Device, LTE radio channel, LTE transmitting baseband processing modules and LTE receive baseband processing module, and LTE reception antennas pass sequentially through
LTE reception bandpass filters connect LTE with LTE radio channel and receive baseband processing module, and LTE transmitting baseband processing modules pass through
LTE radio channel is connected with LTE transmitting antennas；WIFI transceiver channels include WIFI dual-mode antennas, WIFI reception bandpass filters,
The radio-frequency channels WIFI, WIFI transmitting baseband processing modules and WIFI receive baseband processing module, and WIFI reception antennas pass sequentially through
WIFI reception bandpass filters connect WIFI with the radio-frequency channels WIFI and receive baseband processing module, WIFI transmitting baseband processing modules
It is connected with WIFI transmitting antennas by the radio-frequency channels WIFI；
Further include feedback channel, LTE digital interferences cancellation module and WIFI digital interference cancellation modules, LTE transmitting antennas
And the radiofrequency signal of WIFI transmitting antennas transmitting couples a and input feedback channel from its antenna opening respectively, LTE numbers are dry
An input terminal for disturbing cancellation module is connected with LTE radio channel, another input terminal is connect with feedback channel, and LTE numbers are dry
It disturbs the output end of cancellation module and LTE receives baseband processing module and connect；One input terminal of WIFI digital interference cancellation modules
Be connected with the radio-frequency channels WIFI, another input terminal is connect with feedback channel, the output end of WIFI digital interference cancellation modules with
WIFI receives baseband processing module connection；Feedback channel is also connect with LTE radio channel, the radio-frequency channels WIFI respectively.
Length of cable l between feedback channel and radio-frequency front-end interfacei, length of cable m between feedback channel and IF interfacei
Be it is adjustable, according to LTE transmitting antennas between WIFI reception antennas, WIFI transmitting antennas and LTE reception antennas at a distance from it is big
It is small, determine liSize；According between LTE radio channel and LTE digital basebands, the radio-frequency channels WIFI and WIFI digital basebands away from
From size, m is determinediSize.
Feedback channel is total to local oscillator with LTE receiving channels, WIFI receiving channels.
LTE digital interferences cancellation module and WIFI digital interference cancellation modules include adaptive disturbance recognition unit and addition
Device, receiving channel are connected by ADC converters and the in-phase input end of adder, feedback channel pass sequentially through ADC converters and
Adaptive disturbance recognition unit and the inverting input of adder connect.
Adaptive disturbance recognition unit carries out adaptive disturbance identification using RLS algorithm, adaptive disturbance recognition unit
Two input terminal difference input reference signal yr(n), useful signal yfb(n), an output end output adaptive disturbance ecology knot
Fruit signal yrb(n)。
Adaptive disturbance recognition unit includes RLS algorithm module and adder, reference signal yr(n) with the reverse phase of adder
Input terminal connects, useful signal yfb(n) it is connect with an input terminal of RLS algorithm module, the signal of adder output output
It is connect with another input terminal of RLS algorithm module, an output end of RLS algorithm module and the in-phase input end of adder connect
It connects, another output end output adaptive disturbance ecology consequential signal y of RLS algorithm modulerb(n)；
Algorithm initialization：W (n)=0, P (n)=δ-1I；I is unit battle array, and δ values are constant；Forgetting factor value meets 0
λ≤1 ＜；Algorithm in each moment n=1,2 ... when calculate：
Output signal is：yrb(n)=wT(n)yfb(n)。
A kind of LTE and WIFI cobasis station disturbance restraining method, it includes the following steps：
S1：The radiofrequency signal that LTE transmitting antennas and WIFI transmitting antennas are emitted couples portion from antenna opening respectively,
By being total to the feedback channel of local oscillator with LTE receiving channels, WIFI receiving channels, the numeric field of LTE and WIFI is sent into line number
Word Interference Cancellation；
S2：Digital interference is offset, and carries out self-interference identification first, and LTE and WIFI identifications receiving channel interference signal are passed through
The amplitude and phase for going through channel recycle the channel magnitude and phase identified, joint feedback channel data to carry out interference letter
Number rebuild, then by the interference signal of reconstruction with receive signal subtraction, complete digital interference offset.
LTE and WIFI cobasis station disturbance restraining method further include one and adjust between feedback channel and radio-frequency front-end interface
Length of cable li, length of cable m between feedback channel and IF interfaceiThe step of, realize feedback channel by adjusting length of cable
It is synchronous with receiving channel.
The beneficial effects of the invention are as follows：
1) present invention can effectively inhibit existing in the case of LTE and WIFI cobasis station and interfere with each other, including due to receiver
The middle reception bandpass filter existed for useful signal, interference signal after useful signal bandpass filter, believe by interference
Number distorted by bandpass filter, formed at base band with the relevant interference signal of useful signal reception bandpass filter characteristic,
Also the interference signal of this distortion can effectively be offset；
2) by adjusting the length of cable between feedback channel and radio-frequency front-end interface, between feedback channel and IF interface, make
The wireless interference signal precise synchronization that the signal that RF FEEDBACK channel is brought is received with LTE or WIFI, improves and synchronizes essence
Degree, improves Interference Cancellation performance；
Length of cable is adjustable to be advantageous in that：It in time can be compared with the data of Accurate align receiving channel, i.e., in the time
On accomplish precise synchronization receive signal, accuracy be higher than digital synchronous techniques；Need not be done on numeric field feedback channel with
The time synchronization of receiving channel, has saved realization resource, is also equivalent to save departmental cost；Keep receiving channel logical with feedback
The phase noise in road is consistent, influence of the drop Low phase noise to Interference Cancellation performance.
It can well solve in the prior art five that net synchronization capability is bad to be caused interference under cancelling capabilities by adjusting line length
The problem of drop.
Description of the drawings
Fig. 1 is LTE signal interference WIFI signal spectrum masks；
Fig. 2 is the interference cancellation systems structure chart of the prior art four；
Fig. 3 is the digital interference counteracting method system construction drawing of the prior art five；
Fig. 4 is LTE and WIFI cobasis station inner model of system structural schematic diagram；
Fig. 5 is present system structural schematic diagram when LTE, WIFI dual-mode antenna detach；
Fig. 6 is present system structural schematic diagram when LTE, WIFI dual-mode antenna share；
Fig. 7 is digital interference cancellation module structural schematic diagram；
Fig. 8 is adaptive disturbance recognition unit interface structure schematic diagram；
Fig. 9 is adaptive disturbance recognition unit internal structure schematic diagram；
Figure 10 is that digital interference offsets simulation architecture schematic diagram.
Specific implementation mode
Technical scheme of the present invention is described in further detail below in conjunction with the accompanying drawings, but the scope of the present invention be not limited to
It is lower described.
For LTE and the case where the cobasis stations WIFI, inner model of system as shown in figure 4, according to this system model, into
When the base band of row interference offsets design, consideration solves the problems, such as following several big：
(1) LTE and existing interference between each other in the case of WIFI cobasis station are eliminated.
(2) in the case of LTE and WIFI cobasis station, due to there is the reception bandpass filtering for useful signal in receiver
Device, after useful signal bandpass filter, interference signal is distorted interference signal by bandpass filter, is formd at base band
With the relevant interference signal of useful signal reception bandpass filter characteristic, the interference signal of the distortion is offset.
(3) it on the basis of digital interference cancellation scheme, proposes improvement project, synchronization accuracy is further increased, to carry
High interference cancelling capabilities.
A kind of LTE and WIFI cobasis station Interference Suppression System, including LTE transceiver channels and WIFI transceiver channels, LTE transmitting-receivings
Channel includes that LTE dual-mode antennas, LTE reception bandpass filters, LTE radio channel, LTE transmitting baseband processing modules and LTE connect
Baseband processing module is received, LTE reception antennas pass sequentially through LTE reception bandpass filters and connect LTE reception bases with LTE radio channel
Tape handling module, LTE transmitting baseband processing modules are connected by LTE radio channel with LTE transmitting antennas；WIFI transceiver channel packets
WIFI dual-mode antennas, WIFI reception bandpass filters, the radio-frequency channels WIFI, WIFI transmitting baseband processing modules and WIFI is included to receive
Baseband processing module, WIFI reception antennas pass sequentially through WIFI reception bandpass filters and connect WIFI receptions with the radio-frequency channels WIFI
Baseband processing module, WIFI transmitting baseband processing modules are connected by the radio-frequency channels WIFI with WIFI transmitting antennas.Such as Fig. 5 institutes
Show, the separation of LTE, WIFI dual-mode antenna；As shown in fig. 6, LTE, WIFI dual-mode antenna share.
As shown in Figure 5 and Figure 6, LTE and WIFI cobasis station Interference Suppression System, further include feedback channel, LTE digital interferences
Cancellation module and WIFI digital interference cancellation modules, LTE transmitting antennas and WIFI transmitting antennas transmitting radiofrequency signal respectively from
A and input feedback channel, an input terminal and the LTE radio channel of LTE digital interference cancellation modules are coupled at its antenna opening
It is connected, another input terminal is connect with feedback channel, and output end and the LTE of LTE digital interference cancellation modules receive Base-Band Processing
Module connects；One input terminal of WIFI digital interference cancellation modules is connected with the radio-frequency channels WIFI, another input terminal with it is anti-
Feedthrough road connects, and output end and the WIFI of WIFI digital interference cancellation modules receive baseband processing module and connect；Feedback channel is also
It is connect respectively with LTE radio channel, the radio-frequency channels WIFI.
Length of cable l between the feedback channel and radio-frequency front-end interfacei(the cable between feedback channel and transmitting antenna
Length), the length of cable m between feedback channel and IF interfacei(cable between feedback channel and digital interference cancellation module is long
Degree) be it is adjustable, according to LTE transmitting antennas between WIFI reception antennas, WIFI transmitting antennas and LTE reception antennas at a distance from
Size, determine liSize；According between LTE radio channel and LTE digital basebands, the radio-frequency channels WIFI and WIFI digital basebands
Apart from size, determine miSize.
The ability that the net synchronization capability extreme influence digital interference of feedback channel and receiving channel is offset is tied from subsequent emulation
Fruit can also make interference cancellation capability decline 14dB or more it can also be seen that even synchronous error is 1/8 chip delay.Simultaneously
High-precision digital synchronous also means that the increase of complexity.Therefore, can be good at solving existing skill by adjusting line length
Net synchronization capability is bad in art five causes interference with the problem of cancelling capabilities decline.
The feedback channel is total to local oscillator with LTE receiving channels, WIFI receiving channels.
As shown in fig. 7, LTE digital interferences cancellation module and WIFI digital interference cancellation modules include adaptive disturbance identification
Unit and adder, receiving channel are connected by ADC converters and the in-phase input end of adder, and feedback channel passes sequentially through
ADC converters and the connection of adaptive disturbance recognition unit and the inverting input of adder.
As shown in figure 8, adaptive disturbance recognition unit carries out adaptive disturbance identification, adaptive disturbance using RLS algorithm
Two input terminals difference input reference signal y of recognition unitr(n), useful signal yfb(n), an output end output adaptive
Disturbance ecology consequential signal yrb(n)。
As shown in figure 9, adaptive disturbance recognition unit includes RLS algorithm module and adder, reference signal yr(n) and add
The inverting input of musical instruments used in a Buddhist or Taoist mass connects, useful signal yfb(n) it is connect with an input terminal of RLS algorithm module, adder output
The signal of output is connect with another input terminal of RLS algorithm module, an output end of RLS algorithm module and adder it is same
Phase input terminal connects, another output end output adaptive disturbance ecology consequential signal y of RLS algorithm modulerb(n)；
Algorithm initialization：W (n)=0, P (n)=δ-1I；I is unit battle array, and δ values are constant, generally take 0.1；Forgetting factor
Value meets 0 λ≤1 ＜；Algorithm in each moment n=1,2 ... when calculate：
Output signal is：
yrb(n)=wT(n)yfb(n)。
A kind of LTE and WIFI cobasis station disturbance restraining method, it includes the following steps：
S1：The radiofrequency signal that LTE transmitting antennas and WIFI transmitting antennas are emitted couples portion from antenna opening respectively,
By being total to the feedback channel of local oscillator with LTE receiving channels, WIFI receiving channels, the numeric field of LTE and WIFI is sent into line number
Word Interference Cancellation；
S2：Digital interference is offset, and carries out self-interference identification first, and LTE and WIFI identifications receiving channel interference signal are passed through
The amplitude and phase for going through channel recycle the channel magnitude and phase identified, joint feedback channel data to carry out interference letter
Number rebuild, then by the interference signal of reconstruction with receive signal subtraction, complete digital interference offset.
LTE and WIFI cobasis station disturbance restraining method further include one and adjust between feedback channel and radio-frequency front-end interface
Length of cable li, length of cable m between feedback channel and IF interfaceiThe step of, realize feedback channel by adjusting length of cable
It is synchronous with receiving channel.
Influence below by way of simulation analysis synchronization accuracy to Interference Cancellation performance, it is as shown in Figure 10 to establish simulation model.
Simulated conditions such as the following table 1：
Table 1 emulates entry
Table 2 emulates 1 result of entry record
It is more than that 1 data continues that the result emulated from table 2, which can be seen that when feedback channel signal falls behind receiving channel signal,
Time, interference suppressioning effect decline very serious.
Table 3 emulates 2 result of entry record
From simulated conditions it is found that channel and receiving filter are characterized with a path filter, and the channel wave in emulation
The exponent number of device is 18 ranks.It can be seen that from the simulation result of table 3 and be less than 2 when receiving channel signal falls behind feedback channel signal
When data duration, interference suppressioning effect is all greater than 43dB's.But surpass when receiving channel signal falls behind feedback channel signal
When crossing 2 data durations, interference suppressioning effect drastically declines.This is because the exponent number 18+2 of path filter (is received logical
Road signal falls behind the length of feedback channel signal)=20, and the longest tap of our RLS sef-adapting filters and most short tap
Between time difference just be 20, as long as it means that receiving channel signal fall behind feedback channel signal add path filter
Group delay is included in RLS sef-adapting filter longest taps in the time window of most short tap, and interference suppressioning effect will be kept
Higher level.
It is can be seen that from emulation above even synchronous error is 1/8 chip delay, can also be made under interference cancellation capability
14dB or more drops.Therefore feedback channel and the synchronization accuracy of receiving channel influence Interference Cancellation performance very big.
The above is only a preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form is not to be taken as excluding other embodiments, and can be used for other combinations, modifications, and environments, and can be at this
In the text contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art institute into
Capable modifications and changes do not depart from the spirit and scope of the present invention, then all should be in the protection domain of appended claims of the present invention
It is interior.
Claims (5)
1. a kind of LTE and WIFI cobasis station Interference Suppression System, including LTE transceiver channels and WIFI transceiver channels, LTE transmitting-receivings are logical
Road includes that LTE dual-mode antennas, LTE reception bandpass filters, LTE radio channel, LTE transmitting baseband processing modules and LTE are received
Baseband processing module, LTE reception antennas pass sequentially through LTE reception bandpass filters and connect LTE reception base band with LTE radio channel
Processing module, LTE transmitting baseband processing modules are connected by LTE radio channel with LTE transmitting antennas；WIFI transceiver channels include
WIFI dual-mode antennas, WIFI reception bandpass filters, the radio-frequency channels WIFI, WIFI transmitting baseband processing modules and WIFI receive base
Tape handling module, WIFI reception antennas pass sequentially through WIFI reception bandpass filters and connect WIFI reception bases with the radio-frequency channels WIFI
Tape handling module, WIFI transmitting baseband processing modules are connected by the radio-frequency channels WIFI with WIFI transmitting antennas；
It is characterized in that：Further include feedback channel, LTE digital interferences cancellation module and WIFI digital interference cancellation modules, LTE hairs
The radiofrequency signal for penetrating antenna and the transmitting of WIFI transmitting antennas couples a and input feedback channel, LTE from its antenna opening respectively
One input terminal of digital interference cancellation module is connected with LTE radio channel, another input terminal is connect with feedback channel, LTE
The output end of digital interference cancellation module receives baseband processing module with LTE and connect；One of WIFI digital interference cancellation modules
Input terminal is connected with the radio-frequency channels WIFI, another input terminal is connect with feedback channel, WIFI digital interference cancellation modules it is defeated
Outlet receives baseband processing module with WIFI and connect；Feedback channel is also connect with LTE radio channel, the radio-frequency channels WIFI respectively；
Length of cable l between the feedback channel and radio-frequency front-end interfacei, length of cable m between feedback channel and IF interfacei
Be it is adjustable, according to LTE transmitting antennas between WIFI reception antennas, WIFI transmitting antennas and LTE reception antennas at a distance from it is big
It is small, determine liSize；According between LTE radio channel and LTE digital basebands, the radio-frequency channels WIFI and WIFI digital basebands away from
From size, m is determinediSize.
2. a kind of LTE according to claim 1 and WIFI cobasis station Interference Suppression System, it is characterised in that：Described is anti-
Feedthrough road is total to local oscillator with LTE receiving channels, WIFI receiving channels.
3. a kind of LTE according to claim 1 and WIFI cobasis station Interference Suppression System, it is characterised in that：The LTE
Digital interference cancellation module and WIFI digital interference cancellation modules include adaptive disturbance recognition unit and adder, receiving channel
It is connected by ADC converters and the in-phase input end of adder, feedback channel passes sequentially through ADC converters and adaptive disturbance is known
Other unit and the inverting input of adder connect.
4. a kind of LTE according to claim 3 and WIFI cobasis station Interference Suppression System, it is characterised in that：It is described from
It adapts to disturbance ecology unit and adaptive disturbance identification, two input terminals of adaptive disturbance recognition unit is carried out using RLS algorithm
Input reference signal y respectivelyr(n), useful signal yfb(n), an output end output adaptive disturbance ecology consequential signal yrb
(n)。
5. a kind of LTE according to claim 4 and WIFI cobasis station Interference Suppression System, it is characterised in that：It is described from
It includes RLS algorithm module and adder, reference signal y to adapt to disturbance ecology unitr(n) connect with the inverting input of adder
It connects, useful signal yfb(n) it is connect with an input terminal of RLS algorithm module, the signal and RLS algorithm of adder output output
Another input terminal of module connects, and an output end of RLS algorithm module and the in-phase input end of adder connect, and RLS is calculated
Another output end output adaptive disturbance ecology consequential signal y of method modulerb(n)；
Algorithm initialization：W (n)=0, P (n)=δ-1I；I is unit battle array, and δ values are constant；0 ＜ λ of forgetting factor value satisfaction≤
1；Algorithm is in each moment n=1,2 ... when calculate：
γ (n)=yr(n)-wH(n-1)yfb(n)
W (n)=w (n-1)+k (n) γ*(n)
Output signal is：
yrb(n)=wT(n)yfb(n)。
Priority Applications (1)
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| CN106304226A (en) * | 2015-06-25 | 2017-01-04 | 深圳市中兴微电子技术有限公司 | A kind of WIFI cut-in method and device |
| CN107659954A (en) * | 2016-07-25 | 2018-02-02 | 中兴通讯股份有限公司 | A kind of terminal communication management method and device, mobile terminal |
| WO2018022052A1 (en) | 2016-07-28 | 2018-02-01 | Hewlett-Packard Development Company, L.P. | Regulating assignment of a wireless local area network communication channel |
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| CN103427872A (en) * | 2013-09-03 | 2013-12-04 | 电子科技大学 | Same-time same-frequency full duplex multi-tap radio frequency self-interference offset system and method |
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