CN106685867A - Upstream noise inhibiting method automatically adapting to noise thresholds in LTE-distributed relay system - Google Patents
Upstream noise inhibiting method automatically adapting to noise thresholds in LTE-distributed relay system Download PDFInfo
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- CN106685867A CN106685867A CN201710045415.4A CN201710045415A CN106685867A CN 106685867 A CN106685867 A CN 106685867A CN 201710045415 A CN201710045415 A CN 201710045415A CN 106685867 A CN106685867 A CN 106685867A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses an upstream noise inhibiting method automatically adapting to noise thresholds in an LTE-distributed relay system. The method comprises the steps of adding a base noise inhibiting module in a baseband digital signal processing unit of a remote unit in the direction of an uplink, getting a sub-band digital signal of each resource block after received an LTE upstream digital baseband signal passes an analysis filter bank, calculating power values of each digital signal in each resource block and a power value of current base noise, and getting an opening threshold and a closing threshold of noise after an automatically adapted noise threshold updates current noise threshold value. Then, calculated digital signal power in each resource block is compared with the noise thresholds in a judgment unit, after which, sub-band signals with low power are set to zero according to a corresponding comparison and judgment method to inhibit the base noise. After noise is inhibited, each sub-band signal in each resource block gets a restructured LTE digital baseline signal through a synthesis filter bank.
Description
Technical field
The present invention relates to the optimization that noise gate is arranged in a kind of uplink noise suppressing method based on wave filter group, application
In LTE distributed digital relay communications systems, belong to wireless communication field.
Background technology
Transmission characteristic and the restriction of various different terrains due to wireless signal, signal continues in signals transmission
It is weak, cause signal to reach some specific regions, these specific regions are referred to as into " blind area ", such as high building, basement, tunnel
The regions such as road, subway, urban fringe and suburb, the mobile device of people cannot realize efficient communication in blind area.For blind
The problem in area, at present in 3GPP (The 3rdGeneration Partnership Project, third generation partner program)
Introduce relaying Relay technologies in agreement LTE (Long Term Evolution, Long Term Evolution) to extend covering for wireless signal
Lid.
In the prior art, LTE distributed digitals relaying is to extend base station range, eliminates the good of signal coverage hole
It is good to select.Its effect be the radiofrequency signal that base station or mobile station send is received and amplified after forward again, play
The effect that one signal relay amplifies is the one kind in wireless communication system with frequency multiplying arrangement.LTE digital relay systems are usual
It is made up of a near-end unit and multiple distributed far-end units.
The ultimate principle of its work is：Near-end unit is that, towards base station end, the donor antenna of near-end unit is typically installed
In the preferable position of donor base station signal, this allows repeater to receive relatively stable signal source, so as to preferably send out
Wave the performance of relaying.Far-end unit is user oriented end, and its hardware circuit and function are substantially similar with near-end unit, the two it
Between be attached by optical fiber or cable.In the uplink, the radio-frequency (RF) receiving and transmission module of far-end unit passes through duplexer by one
Change upstream radio-frequency signal of the antenna reception from user side, radiofrequency signal Jing AD conversion is numeral by Jing integrated radio-frequencies transceiver
Digital base band processor module is passed to after signal；Digital signal is synchronized in digital base band processor module, automatic gain
After the process such as control, digital filtering, serial data is packaged into by certain frame format, is sent to digital interface module；Digital interface
According to the difference of the transmission medium for adopting, such as optical fiber, cable in module, corresponding digital signal is converted into into optical signal or ether
Net signal is sent to near-end unit.The digital interface module of near-end unit is by the optical signal received from far-end unit or Ethernet
Corresponding digital received signals are converted to after signal solution frame；Then multi-path digital signal is carried out numeral by digital base band processor module
After merging, then after Digital Signal Processing, digital signal DA is turned through the integrated radio-frequency transceiver of radio-frequency (RF) receiving and transmission module
Radiofrequency signal is changed to, base station is sent to by integral antenna finally by duplexer.Downlink operation flow process is up-link
The inverse process of workflow.
There are the coverage for expanding base station, the long-distance transmissions little, networking mode of decline clever although distributed digital is relayed
Living the advantages of, but, due to LTE digital optical fiber direct stations, it yet suffers from the shortcoming that base station bottom noise is lifted, and has a strong impact on
The uplink receiving sensitivity of base station, so as to reduce the utilization rate of base station.For the shortcoming of its back noise lifting, there has been proposed
Increase back noise suppression module in relay to suppress the impact of back noise, mainly principle is the LTE numeral bases that will be received
Band signal obtains each Resource Block sub-band digital signal by an analysis filter group；Then each Resource Block numeral is calculated
The energy of signal, and the energy for currently calculating is compared with the noise gate for arranging, when input signal energy spectrum is less than
Noise gate, then the Resource Block sub-band signal is output as 0, if input signal energy is more than noise gate, just by the Resource Block
Output that sub-band input signal is undistorted.Present invention is generally directed to further optimization has been done in the setting of noise gate therein.
The content of the invention
Goal of the invention：For above-mentioned prior art, a kind of uplink noise suppressing method based on wave filter group is proposed, be suitable for
In LTE communication system, for solving the problems, such as prior art in LTE digital relay systems exist base station bottom noise lifting.
Technical scheme：Uplink noise suppressing method with adaptive noise thresholding in a kind of LTE distributed relays system,
Comprise the steps：
In the back noise suppression module of far-end unit, the LTE upstream digital baseband signals for receiving are passed through first
One analysis filter group, obtains each Resource Block sub-band digital signal；Then by it by independent power calculation unit,
Calculate each Resource Block digital power signal and current back noise power；By adaptive noise threshold module according to calculated
Current back noise power updates current noise threshold value, obtains noise and opens thresholding and noise closing thresholding；Then differentiating single
Each Resource Block digital power signal will currently be calculated in unit to be compared with noise gate, when input signal detection performance number it is little
When noise closes thresholding, then the Resource Block sub-band signal is output as 0, if input signal detection performance number gradually increases and big
When noise opens thresholding, just by the undistorted output of Resource Block sub-band input signal；Each Resource Block sub-band signal passes through
After the power calculation and the judgement unit, then by the synthesis filter group corresponding with analysis filter group, so as to obtain
LTE digital baseband signals to after reconstruct.
Further, for the numeral letter of each Resource Block sub-band after a M multichannel analysis wave filter group filtering
Number, the power calculation unit calculates in real time the method for its signal power and is：Calculation window is observed for the window of N by size
The mean power of interior digit symbol, signal y to be calculatedkN () symbol is shifted through successively window, the power E of detectionk(n) table
It is shown as：
Wherein digital signal is yk(n), k=0,1 ..., M-1, it is that LTE digital baseband signals are filtered through M multichannel analysis
After device group, the signal of the k-th Resource Block sub-band for obtaining；N is power calculation unit window size；yk(n-i) represent that i is adopted
Y before sampling pointk(n) value；
The power calculation unit calculates the method for current back noise power：On the filtered non-LTE of analysis filter
The signal of row Resource Block sub-band is current back noise, and the power for calculating current back noise obtains the work(of ambient noise present
Rate Pn(i)。
Further, in the adaptive noise threshold module, the noise opens thresholding Pth1I (), is drawn by following formula：
Pth1(i)=Pth0+β(i)
Wherein, Pth0Thresholding initial value is opened for the noise that pre-sets, β (i) is noise gate variable quantity, Pn(i-1) it is
The environmental noise power at a upper moment, CpIt is two parameters for controlling threshold variation with α, α integrally fluctuates for changing thresholding
Gesture speed, CpFor changing the scope of thresholding instant jitter；
The noise closes thresholding Pth2I () is obtained by following formula：
Pth2(i)=Pth1(i)-Dif(dB)
Wherein, Dif is the difference that noise opens that thresholding and noise are closed between thresholding, and Dif takes 3~5dB.
Beneficial effect：(1) present invention is applied in the far-end unit of LTE distributed relay systems, and uplink direction increases
Plus back noise suppression module, the filtering of device group is filtered to uplink baseband digital signal can effectively remove signal out-of-band noise
Interference, the power detection and threshold discrimination to each Resource Block sub-band baseband signal after filtering, by with noise open thresholding and
Noise closes the comparison of thresholding, and back noise is suppressed.So that the LTE distributed relays system is only to up useful signal
It is amplified, so as to efficiently avoid the defect that base station bottom noise is lifted, the uplink receiving for greatly improving base station is sensitive
Degree.
(2) two noise gates, i.e. noise are set in the present invention and open thresholding and noise closing thresholding, rather than it is traditional
One noise gate, such being advantageous in that avoids decision device switch meeting frequent switching, causes to sentence the mistake of useful signal
What broken belt came blocks nonlinearity erron.
(3) real-time update is carried out to noise gate using adaptive noise thresholding setup module in the present invention, can makes to make an uproar
Glottis limit value changes with the change of environment noise, make the suppression of back noise more accurate, it is to avoid back noise is made an uproar when changing
The unreasonable setting of sound decision threshold.
Description of the drawings
Fig. 1 is the applicable LTE distributed digital relay system structured flowcharts of the present invention.
Fig. 2 is up back noise suppression module theory diagram in the present invention.
Fig. 3 is adaptive noise thresholding operating diagram in the present invention.
Fig. 4 is that the noise of adaptive threshold method in the present invention opens thresholding with noise energy update status analogous diagram.
Fig. 5 is the system bit error rate simulation comparison figure using noise suppression module in the present invention with traditional method.
Specific embodiment
The present invention is done below in conjunction with the accompanying drawings further is explained.
Fig. 1 is the applicable LTE distributed digital relay system structured flowcharts of the present invention.Such as Fig. 1, in LTE distributed digitals
Generally it is made up of a near-end unit and multiple distributed far-end units after system.Near-end unit is towards base station end, closely
The donor antenna of end unit is typically mounted at the preferable position of donor base station signal, and it is more steady that this allows repeater to receive
Fixed signal source, so as to preferably play the performance of relaying.Far-end unit is user oriented end, its hardware circuit and function with
Near-end unit is substantially similar, is attached by optical fiber or cable therebetween.Can be between each far-end unit and near-end unit
There is flexible networking mode, to meet the requirement of communication system.
Fig. 2 gives up back noise suppression module theory diagram in the present invention.Such as Fig. 2, LTE distributed relays of the present invention
Back noise suppressing method is carried out with following steps in system：
1) setting according to resource block number in LTE system needs analysis filter group port number as M, if the M path filters
The analysis filter group of group is H0(z),H1(z),...,HM-1Z (), corresponding synthesis filter group is G0(z),G1(z),...,
GM-1(z).By LTE digital baseband signals after the M multichannel analysis wave filter groups, each Resource Block sub-band digital signal is obtained
y0(n),y1(n),...,yM-1(n)。
2) in order to calculate digital signal y in real timekN the power of (), number in calculation window is observed by size for the window of N
The mean power of character number, signal ykN () symbol is shifted through successively window.The power E of detectionkN () is represented by：
Wherein, N is power calculation unit window size；yk(n-i) y before i sampled point is representedk(n) value.
3) signal of the filtered non-LTE ascending resources block sub-band of analysis filter is current back noise, calculates and works as
The power of front back noise obtains the power P of ambient noise presentn(i)。
4) noise arranged in adaptive noise threshold module opens thresholding initial value Pth0, control the parameter of threshold variation
CpAnd α, Pth0Non- white Gauss noise can be reduced, the interference caused when the harmonic wave, simple spectrum interference such as in band；By following formula
Show that current noise opens threshold value Pth1(i)。
Pth1(i)=Pth0+β(i)
And threshold value P is opened by the noise for obtainingth1I () is calculated as follows and obtains current noise closing threshold value Pth2(i)。
Pth2(i)=Pth1(i)-Dif(dB)
Wherein, β (i) be noise gate variable quantity, Pn(i-1) be a upper moment environmental noise power, Dif opens for noise
The difference that thresholding and noise are closed between thresholding is opened, Dif typically takes 3~5dB.When α obtains larger, thresholding PthChange with noise
Speed is slower, otherwise then very fast.And CpThe size that thresholding bounce amplitude is directly affected by input noise can be controlled.So, α master
Affect overall fluctuation tendency speed, CpMainly affect the scope of its instant jitter.α and CpValue should consider decision, and
System power detection window size, the Slot symbol number of LTE system have much relations, CpUsual value 0.5~3.0, α can use
Value 100~1000.
5) be compared with noise gate according to the performance number calculated in 2), if current system for noise suppressed state,
The energy value E for only calculatingkN () opens thresholding P more than noiseth1I (), just allows the Resource Block sub-band digital signal undistorted
Pass through, system entering signal is otherwise set to 0 by state；If current system passes through state for signal, the energy for only calculating
Value EkN () closes thresholding P less than noiseth2I (), just sets to 0 the Resource Block sub-band digital signal, system enters noise suppressed
State, it is otherwise undistorted to pass through.
6) by each Resource Block sub-band signal through noise suppressed obtained aboveThrough step 1) in synthesis
Wave filter group G0(z),G1(z),...,GM-1Z (), obtains digital baseband signal x ' (n) for reconstructing.X ' (n) is through back noise
Digital baseband signal after suppression module.
Fig. 3 is middle adaptive noise thresholding operating diagram.As shown in figure 3, y0(n),y1(n),...,yM-1(n) be from point
The digital signal of each subband of analysis wave filter group output, by calculating its quadratic sum power in each subband and current is obtained
The power P of environment noisen(i)；Power P of the adaptive threshold module according to ambient noise presentn(i) real-time update current noise
Threshold value；Decision device is compared to each subband self-energy with decision threshold, obtains court verdict.
Fig. 4 gives the noise of adaptive threshold method in the present invention and opens thresholding with the emulation of noise energy update status
Figure.As shown in figure 4, in emulation, the parameter alpha value for controlling threshold variation is 800, CpValue is 2, it is found that when environment is made an uproar
When sound changes, threshold value can be adaptively adjusted with the change of environment noise.
Fig. 5 gives the system bit error rate simulation comparison figure using noise suppression module in the present invention with traditional method.
As shown in figure 4, in emulation, n=2 represents in relay system there is 2 far-end units, from simulation curve as can be seen that using setting
The noise suppression module of the inventive method can be such that Signal-to-Noise is further lifted, so that the bit error rate of system is obtained more
Good improvement.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (3)
1. there is the uplink noise suppressing method of adaptive noise thresholding in a kind of LTE distributed relays system, it is characterised in that
Comprise the steps：
In the back noise suppression module of far-end unit, first the LTE upstream digitals baseband signal for receiving is passed through into one
Analysis filter group, obtains each Resource Block sub-band digital signal；Then it is calculated by independent power calculation unit
Go out each Resource Block digital power signal and current back noise power；By adaptive noise threshold module according to calculated current
Back noise power updates current noise threshold value, obtains noise and opens thresholding and noise closing thresholding；Then in judgement unit
Each Resource Block digital power signal will currently be calculated to be compared with noise gate, made an uproar when input signal detection performance number is less than
When sound closes thresholding, then the Resource Block sub-band signal is output as 0, if input signal detection performance number gradually increases and more than making an uproar
When sound opens thresholding, just by the undistorted output of Resource Block sub-band input signal；Each Resource Block sub-band signal is by described
After power calculation and the judgement unit, then by the synthesis filter group corresponding with analysis filter group, so as to obtain weight
LTE digital baseband signals after structure.
2. the upstream noise with adaptive noise thresholding suppresses in LTE distributed relays system according to claim 1
Method, it is characterised in that：For the numeral letter of each Resource Block sub-band after a M multichannel analysis wave filter group filtering
Number, the power calculation unit calculates in real time the method for its signal power and is：Calculation window is observed for the window of N by size
The mean power of interior digit symbol, signal y to be calculatedkN () symbol is shifted through successively window, the power E of detectionk(n) table
It is shown as：
Wherein digital signal is yk(n), k=0,1 ..., M-1, it is LTE digital baseband signals through M multichannel analysis wave filter groups
Afterwards, the signal of the k-th Resource Block sub-band for obtaining；N is power calculation unit window size；yk(n-i) i sampled point is represented
Front yk(n) value；
The power calculation unit calculates the method for current back noise power：The up moneys of the filtered non-LTE of analysis filter
The signal of source block sub-band is current back noise, and the power for calculating current back noise obtains the power P of ambient noise presentn
(i)。
3. the upstream noise with adaptive noise thresholding suppresses in LTE distributed relays system according to claim 1
Method, it is characterised in that：In the adaptive noise threshold module, the noise opens thresholding Pth1I (), is drawn by following formula：
Pth1(i)=Pth0+β(i)
Wherein, Pth0Thresholding initial value is opened for the noise that pre-sets, β (i) is noise gate variable quantity, Pn(i-1) it is upper one
The environmental noise power at moment, CpIt is two parameters for controlling threshold variation with α, α is fast for changing thresholding entirety fluctuation tendency
Slowly, CpFor changing the scope of thresholding instant jitter；
The noise closes thresholding Pth2I () is obtained by following formula：
Pth2(i)=Pth1(i)-Dif(dB)
Wherein, Dif is the difference that noise opens that thresholding and noise are closed between thresholding, and Dif takes 3~5dB.
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| CN108521657A (en) * | 2018-03-28 | 2018-09-11 | 京信通信系统（中国）有限公司 | Multi-service digital distribution system uplink bottom is made an uproar optimization method, device and system |
| CN108696927A (en) * | 2018-05-26 | 2018-10-23 | 四川省大见通信技术有限公司 | Digital junction equipment and the method for wireless network non-blind area covering and reducing power consumption |
| CN109428625A (en) * | 2017-08-24 | 2019-03-05 | 大唐移动通信设备有限公司 | A kind of the merging transmission method and device of cell signal |
| CN110572224A (en) * | 2019-08-22 | 2019-12-13 | 三维通信股份有限公司 | Method, device, system and readable storage medium for reducing base station receiving background noise |
| CN110784916A (en) * | 2019-10-30 | 2020-02-11 | 陕西天基通信科技有限责任公司 | Self-adaptive control method and system according to terminal user traffic |
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