CN109120560A - Adaptive ICI inter-carrier interference elimination method and device - Google Patents
Adaptive ICI inter-carrier interference elimination method and device Download PDFInfo
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- CN109120560A CN109120560A CN201710481060.3A CN201710481060A CN109120560A CN 109120560 A CN109120560 A CN 109120560A CN 201710481060 A CN201710481060 A CN 201710481060A CN 109120560 A CN109120560 A CN 109120560A
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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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03821—Inter-carrier interference cancellation [ICI]
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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
- H04L25/0202—Channel estimation
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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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
-
- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03312—Arrangements specific to the provision of output signals
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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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03592—Adaptation methods
- H04L2025/03598—Algorithms
- H04L2025/03611—Iterative algorithms
- H04L2025/03617—Time recursive algorithms
- H04L2025/03624—Zero-forcing
Abstract
The present invention provides a kind of adaptive ICI inter-carrier interference elimination methods and device characterized by comprising handles to obtain the processing result of the first order to the data progress first order is received；First order signal-to-noise ratio result is calculated using the processing result of the first order；ICI inter-carrier interference value is estimated using the processing result of the first order, is accordingly eliminated based on this ICI inter-carrier interference value to data are received, obtains data after level-one is eliminated；Data carry out second level processing after being eliminated using the level-one, obtain the processing result of the second level；Second level signal-to-noise ratio result is calculated using the processing result of the second level；And compare the size of first order signal-to-noise ratio result and second level signal-to-noise ratio result, wherein the corresponding processing result of the greater is exported for selection, the present invention selects the corresponding equilibrium result of high SNR by comparing the size of SNR twice, avoids because ICI estimation is not allowed to decline to system bring performance.
Description
Technical field
The present invention relates to multimedia transmissions, mobile communication technology, and in particular, to one kind is in OFDM (Orthogonal
Frequency Division Multiplexing, orthogonal frequency division multiplexing) ICI (Inter-Carrier is eliminated in system
Interference, inter-carrier interference) device.
Background technique
OFDM eats dishes without rice or wine technology as a kind of physical layer with higher frequency spectrum utilization rate, be widely used to DVB-T2,
In the multimedia transmissions such as ATSC3.0, LTE, mobile communication standard and system.
In an ofdm system, channel is divided into several orthogonal subchannels (i.e. subcarrier), so as to by high speed
Data-signal is converted into parallel low speed sub-data flow, is modulated to and is transmitted on each subcarrier.Due to subcarrier bandwidth
It is relatively narrow, therefore each sub-data stream is all equivalent to flat fading propagation, and due to having orthogonality between each subcarrier, so respectively
It is not interfere with each other between sub-data stream.
However, frequency shift (FS) and system transmitter and receiver in the time variation of wireless channel, signals transmission
The factors such as the frequency error between crystal oscillator may all destroy the orthogonality between ofdm system subcarrier, so that ICI is generated, shadow
Ring ofdm system performance.So from being born from ofdm system, research of the people to ICI technology is eliminated just never stops
It crosses.
Currently used ICI technology for eliminating is all after original channel estimation and balance module mostly, and addition is only
Vertical ICI cancellation module.As shown in Figure 1, this module utilizes the domain channel response H of channel estimation output, balanced device output
Planisphere X estimates the additivity ICI of each subcarrier, then in the frequency domain data of original subcarrier by certain method
On subtracted each other, with realize frequency domain received data ICI eliminate.Then the frequency domain data eliminated after ICI is again passed by
Channel estimation and balance module, the equilibrium result after the ICI that has been eliminated improve to reduce the influence of ICI
Weigh demodulation performance.
In these methods, ICI eliminate validity place one's entire reliance upon system for ICI estimate it is accurate whether, and this
The accuracy with the module results such as channel estimation has direct association again.When channel condition is preferable, channel estimation it is accurate
Property is guaranteed, and ICI cancellation module can provide postiive gain；And when channel condition is bad, the accuracy of channel estimation may
Poor, ICI cancellation module may provide negative gain to system at this time.
Summary of the invention
The present invention proposes the ICI removing method and device of a kind of adaptive structure, can be according to the eradicating efficacy of ICI, certainly
Adaptively selection ICI eliminate before or after, twice in equilibrium result preferable one send subsequent module to, to avoid
Because ICI estimation is not allowed to give the decline of system bring performance.
The present invention provides a kind of adaptive ICI inter-carrier interference elimination methods characterized by comprising to reception
Data carry out the first order and handle to obtain the processing result of the first order；The first order is calculated using the processing result of the first order
Signal-to-noise ratio result；ICI inter-carrier interference value is estimated using the processing result of the first order, is based on this ICI inter-carrier interference
Value is accordingly eliminated to data are received, and obtains data after level-one is eliminated；Data carry out the second level after being eliminated using the level-one
Processing, obtains the processing result of the second level；Second level signal-to-noise ratio result is calculated using the processing result of the second level；With
And compare the size of first order signal-to-noise ratio result and second level signal-to-noise ratio result, select the wherein corresponding processing result of the greater
It is exported.
Still optionally further, in adaptive ICI inter-carrier interference elimination method provided by the invention, feature exists
In, wherein the reception data are frequency domain input data, and first order processing includes: first order channel estimation obtains first order frequency
Domain channel result, and then first order equilibrium obtains the processing result of the first order；Second level processing includes: may be selected directly to utilize
The level-one frequency domain channel result or using ICI eliminate after second level frequency domain channel result as the second level equilibrium
Input, obtains the processing result of the second level.
Still optionally further, in adaptive ICI inter-carrier interference elimination method provided by the invention, feature exists
In, wherein first order equilibrium includes: utilizing frequency domain channel as a result, noise power estimation value and frequency domain input data are made
Weighing apparatus processing；Second level equilibrium includes: using the level-one frequency domain channel result or second level frequency domain channel as a result, noise power
Frequency domain input data makees equilibrium treatment after estimated value and ICI are eliminated.
Still optionally further, in adaptive ICI inter-carrier interference elimination method provided by the invention, feature exists
In, wherein equilibrium treatment includes breaking zero method, MMSE minimum mean square error method by ZF.
Still optionally further, in adaptive ICI inter-carrier interference elimination method provided by the invention, feature exists
In, wherein using the processing result and first order frequency domain channel result, the processing result of the first order of the first order, estimate
Count the ICI inter-carrier interference value of each subcarrier.
Still optionally further, in adaptive ICI inter-carrier interference elimination method provided by the invention, feature exists
In, wherein using corresponding processing result and standard planisphere, to respectively correspond to obtain first order signal-to-noise ratio result and the
Second level signal-to-noise ratio result.
Still optionally further, in adaptive ICI inter-carrier interference elimination method provided by the invention, feature exists
In, wherein signal-to-noise ratio result computational method includes: pilot portion in extraction process result and standard planisphere, between transmission star
Seat figure carries out overpower normalized, signal-to-noise ratio result is calculated.
In addition, the present invention also provides a kind of adaptive ICI inter-carrier interference cancellation elements, which is characterized in that packet
Include: first order processing module handles to obtain the processing result of the first order for carrying out the first order to reception data；First order letter
It makes an uproar compared estimate module, first order signal-to-noise ratio result is calculated for the processing result using the first order；ICI cancellation module,
ICI inter-carrier interference value is estimated using the processing result of the first order, based on this ICI inter-carrier interference value to reception number
According to accordingly being eliminated, data after level-one is eliminated are obtained；Second level processing module, data carry out after being eliminated using the level-one
Second level processing, obtains the processing result of the second level；Second level signal-to-noise ratio (SNR) estimation module, utilizes the processing result of the second level
Second level signal-to-noise ratio result is calculated；And compare selector, compare first order signal-to-noise ratio result and second level signal-to-noise ratio knot
The size of fruit, wherein the corresponding processing result of the greater is exported for selection.
Still optionally further, in adaptive ICI inter-carrier interference cancellation element provided by the invention, feature exists
In, wherein the reception data are frequency domain input data, and first order processing module includes: cascade first order channel estimation
Module and first order equilibrium submodule, first order channel estimation obtains first order frequency domain channel as a result, the first order is balanced in turn
To the processing result of the first order；Second level processing module includes: second level equilibrium submodule and further the second of optional setting
Second after directly eliminating using the level-one frequency domain channel result or using ICI may be selected in grade channel estimation submodule
Input of the grade frequency domain channel result as second level equilibrium, obtains the processing result of the second level.
Still optionally further, in adaptive ICI inter-carrier interference cancellation element provided by the invention, feature exists
In, wherein first order equilibrium submodule includes: utilizing frequency domain channel as a result, noise power estimation value and frequency domain input number
According to making equilibrium treatment；Second level equilibrium submodule includes: utilizing the level-one frequency domain channel result or second level frequency domain channel knot
Frequency domain input data makees equilibrium treatment after fruit, noise power estimation value and ICI are eliminated.
Function and effect of the invention
The present invention eliminates front and back balanced obtained planisphere twice using ICI, Signal to Noise Ratio (SNR) is calculated, by comparing twice
The size of SNR selects the corresponding equilibrium result of high SNR, avoids because ICI estimation is not allowed to decline to system bring performance.
Detailed description of the invention
Fig. 1 is existing ICI cancellation element structure；
Fig. 2 is the adaptive ICI cancellation element structural schematic diagram in the embodiment of the present invention；And
Fig. 3 is the adaptive ICI cancellation element processing flow schematic diagram in the embodiment of the present invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the skill of this field
Art personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the common of this field
For technical staff, without departing from the inventive concept of the premise, various modifications and improvements can be made.These are belonged to
Protection scope of the present invention.
For convenience of description, the specific estimation method of ICI and the specific estimation method of SNR being related in the present invention, are adopted
It is described with currently more common scheme, but the scope of the present invention is not limited to described in the text.
In conjunction with Figure of description 2,3, to adaptive ICI inter-carrier interference elimination method and dress provided by the invention
It sets and is illustrated.
In the present embodiment, adaptive ICI inter-carrier interference elimination method comprising the steps of:
Step 1: first order channel estimation module obtain the frequency domain channel of first time as a result, the first order frequency domain channel knot
Fruit H1；
Step 2: first order balance module utilizes the frequency domain channel result H1, noise power estimation value σ of first time2, and
Frequency domain input data R, by ZF, (Zero Force: broken zero), (Minimum Mean Squared Error: minimum is by MMSE
Square error) the methods of obtain the first order it is balanced after result X1；
Step 3: first order SNR estimation module is calculated using result X1 and standard planisphere of the first order after balanced
Obtain the corresponding first order signal-to-noise ratio result SNR1 of first order equilibrium result.Wherein, estimation method is illustrated are as follows: extracts first
Pilot portion in result X1 and standard planisphere after grade is balanced, is denoted as X1 respectivelyPilotAnd DPilot, thenOverpower normalization is often carried out due to sending planisphere again, therefore
Step 4:ICI cancellation module estimates each sub- load using first order channel estimation and the first order equilibrium result H1, X1
The ICI value of wave, and subtracted on frequency domain data R.
Wherein, the specific ICI estimation method that should be reduced on frequency domain data R based on ICI value, can be used and announced
Paper " ICI Mitigation for Pilot-Aided OFDM Mobile Systems, Yasamin Mostofi,
Donald C.Cox " the scheme carries out, it may be assumed that using the channel estimation results of this and last time OFDM symbol, obtains the change of H1
Change situation H1slope=H1-H1pre.Then it is filtered, obtains the ICI estimated value of subcarrier i:
Wherein, filter factorN, G are respectively represented
The length of OFDM symbol and the length of cyclic prefix, L represent filter length, are artificially arranged,It is that X1 is corresponding to sentence firmly
As a result.
The elimination of ICI: R'(i is carried out to frequency domain data)=R (i)-ICI (i), obtain data after level-one is eliminated.
Step 5: data R' after being eliminated using level-one is carried out second level channel estimation, obtains result H2.
Step 6: data R', H2 after being eliminated using level-one are carried out second level equilibrium treatment, obtain the processing knot of the second level
Fruit X2.
Step 7: using the processing result X2 and standard planisphere of the second level, carrying out second level SNR estimation, obtain second
Grade signal-to-noise ratio result SNR2.Estimation method need to be consistent with first order SNR estimation module: extracting leading in X1 and standard planisphere
Frequency part, is denoted as X2 respectivelyPilotAnd DPilot, thenIt repeats no more.
Step 8: comparing SNR1, SNR2 size, if SNR1 > SNR2, X1 is exported to subsequent module；If SNR1≤
SNR2 then exports X2 to subsequent module, that is, select wherein the corresponding processing result of the greater exported, SNR1, SNR2 are big
Small equal, then the processing result of an optional first order or the processing result of the second level are exported.
It is worth noting that first order equilibrium and second level equilibrium have to, it is in channel estimation principle in Fig. 2
Two-stage is needed, but in actual implementation, the difference is that can there was only first order channel in embodiment corresponding with above-mentioned Fig. 2
Estimation, (at this point, second level equilibrium also directlys adopt the H that first order channel estimation obtains.That is, second level processing packet
Contain: may be selected directly using level-one frequency domain channel result or using ICI elimination after second level frequency domain channel result as
The input of second level equilibrium, obtains the processing result of the second level.
The present embodiment additionally provides a kind of adaptive ICI inter-carrier interference cancellation element in Fig. 2, comprising:
First order processing module, first order signal-to-noise ratio (SNR) estimation module, ICI cancellation module, first order processing module, second
Grade signal-to-noise ratio (SNR) estimation module compares selector.
Wherein, first order processing module includes first order channel estimation submodule and first order equilibrium treatment submodule, the
Two stage treatment module includes second level channel estimation submodule and second level equilibrium treatment submodule.
First order processing module handles to obtain the processing result of the first order for carrying out the first order to reception data；First
Grade signal-to-noise ratio (SNR) estimation module, is calculated first order signal-to-noise ratio result for the processing result using the first order；ICI is eliminated
Module estimates ICI inter-carrier interference value using the processing result of the first order, is docked based on this ICI inter-carrier interference value
It receives data accordingly to be eliminated, obtains data after level-one is eliminated；Second level processing module, data after being eliminated using the level-one
Second level processing is carried out, the processing result of the second level is obtained；Second level signal-to-noise ratio (SNR) estimation module, utilizes the processing of the second level
As a result second level signal-to-noise ratio result is calculated；And compare selector, compare first order signal-to-noise ratio result and second level noise
Than the size of result, wherein the corresponding processing result of the greater is exported for selection.
Data are as second level equilibrium after second level frequency domain channel result and level-one after being eliminated using ICI are eliminated
Input, obtains the processing result of the second level.
In addition, also can choose in Second processing module in addition to the embodiment in Fig. 2 and be not provided with second level channel estimation
Submodule may be selected directly to carry out second level equilibrium using the level-one frequency domain channel result.
As shown in Fig. 2, increasing by two SNR estimators for Fig. 1 compared to the prior art, front and back is eliminated to ICI
Equilibrium result carry out SNR estimation, since SNR can directly react the quality of equilibrium result, it is possible to utilize subsequent ratio
Compared with device, the equilibrium result of SNR high is selected, to realize adaptively ICI.
Claims (10)
1. a kind of adaptive ICI inter-carrier interference elimination method characterized by comprising
It handles to obtain the processing result of the first order to the data progress first order is received；
First order signal-to-noise ratio result is calculated using the processing result of the first order；
ICI inter-carrier interference value is estimated using the processing result of the first order, based on this ICI inter-carrier interference value to reception
Data are accordingly eliminated, and data after level-one is eliminated are obtained；
Data carry out second level processing after being eliminated using the level-one, obtain the processing result of the second level；
Second level signal-to-noise ratio result is calculated using the processing result of the second level；And
Compare the size of first order signal-to-noise ratio result and second level signal-to-noise ratio result, selects the wherein corresponding processing result of the greater
It is exported.
2. adaptive ICI inter-carrier interference elimination method as described in claim 1, which is characterized in that
Wherein, the reception data are frequency domain input data,
First order processing includes: first order channel estimation obtains first order frequency domain channel as a result, first order equilibrium obtains the in turn
The processing result of level-one；
Second level processing includes: the after directly eliminating using the level-one frequency domain channel result or using ICI may be selected
Input of the second level frequency domain channel result as second level equilibrium, obtains the processing result of the second level.
3. adaptive ICI inter-carrier interference elimination method as claimed in claim 2, which is characterized in that
Wherein, first order equilibrium includes: utilizing frequency domain channel as a result, noise power estimation value and frequency domain input data are made
Weighing apparatus processing；
Second level equilibrium includes: using the level-one frequency domain channel result or second level frequency domain channel as a result, noise power estimation
Frequency domain input data makees equilibrium treatment after value and ICI are eliminated.
4. adaptive ICI inter-carrier interference elimination method as claimed in claim 3, which is characterized in that
Wherein, equilibrium treatment includes breaking zero method, MMSE minimum mean square error method by ZF.
5. adaptive ICI inter-carrier interference elimination method as described in claim 1, which is characterized in that
Wherein, using the processing result of the first order and first order frequency domain channel result, the processing result of the first order, estimate
Count the ICI inter-carrier interference value of each subcarrier.
6. adaptive ICI inter-carrier interference elimination method as described in claim 1, which is characterized in that
Wherein, using corresponding processing result and standard planisphere, to respectively correspond to obtain first order signal-to-noise ratio result and
Second level signal-to-noise ratio result.
7. adaptive ICI inter-carrier interference elimination method as claimed in claim 6, which is characterized in that
Wherein, signal-to-noise ratio result computational method includes: pilot portion in extraction process result and standard planisphere, between transmission star
Seat figure carries out overpower normalized, signal-to-noise ratio result is calculated.
8. adaptive ICI inter-carrier interference elimination method as described in claim 1, which is characterized in that
Wherein, the size for comparing first order signal-to-noise ratio result and second level signal-to-noise ratio result selects wherein any one if equal
A first order signal-to-noise ratio result or the corresponding processing result of corresponding second level signal-to-noise ratio result are exported.
9. a kind of adaptive ICI inter-carrier interference cancellation element characterized by comprising
First order processing module handles to obtain the processing result of the first order for carrying out the first order to reception data；
First order signal-to-noise ratio result is calculated for the processing result using the first order in first order signal-to-noise ratio (SNR) estimation module；
ICI cancellation module estimates ICI inter-carrier interference value using the processing result of the first order, is based on this ICI intercarrier
Interference value is accordingly eliminated to data are received, and obtains data after level-one is eliminated；
Second level processing module, data carry out second level processing after being eliminated using the level-one, obtain the processing result of the second level；
Second level signal-to-noise ratio result is calculated using the processing result of the second level in second level signal-to-noise ratio (SNR) estimation module；And
Compare selector, compare the size of first order signal-to-noise ratio result and second level signal-to-noise ratio result, selects wherein the greater pair
The processing result answered is exported.
10. adaptive ICI inter-carrier interference cancellation element as claimed in claim 9, which is characterized in that
Wherein, the reception data are frequency domain input data,
First order processing module includes: cascade first order channel estimation submodule and first order equilibrium submodule, first order letter
Road is estimated to obtain first order frequency domain channel as a result, first order equilibrium obtains the processing result of the first order in turn；
Second level processing module includes: the second level channel estimation submodule of second level equilibrium submodule and further optional setting
The second level frequency domain channel result after directly eliminating using the level-one frequency domain channel result or using ICI may be selected in block
As the input of second level equilibrium, the processing result of the second level is obtained.
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