CN109450827A - Channel estimation methods and system based on next-generation wireless waveform FBMC-OQAM - Google Patents
Channel estimation methods and system based on next-generation wireless waveform FBMC-OQAM Download PDFInfo
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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
- H04L25/0224—Channel estimation using sounding 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
- H04L25/0202—Channel estimation
- H04L25/024—Channel estimation channel estimation algorithms
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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
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Abstract
The invention discloses a kind of channel estimation methods and system based on next-generation wireless waveform FBMC-OQAM, are related to next generation mobile communication technical field.Method includes the following steps: interfering enhancing receiving end pilot beacon energy using intrinsic imaginary number, the channel estimation accuracy of FBMC-OQAM is improved.The present invention can effectively improve the channel estimation accuracy of FBMC-OQAM.
Description
Technical field
The present invention relates to next generation mobile communication technical fields, are specifically related to a kind of based on next-generation wireless waveform
The channel estimation methods and system of FBMC-OQAM.
Background technique
In the 4G epoch, radio physical layer basic waveform technology uses CP-OFDM (Cyclic Prefix-
Orthogonal Frequency Division Multiplexing, the orthogonal frequency division multiplexing with cyclic prefix) technology.But
It is that OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing) is brought much not
Foot place.
Such as: the filtering mode of ofdm system be rectangle window filtering, and in the signal be inserted into CP (Cyclic Prefix,
Cyclic prefix), the defects of with to anti-multipath fading, this results in the waste of radio resource and impaired data transmission bauds.
Further, since OFDM technology uses square wave as basic waveform, carrier wave secondary lobe is larger, thus in each carrier synchronization
In the case where being unable to strict guarantee, so that the interference between adjacent carrier is than more serious.
There are many harm of OFDM secondary lobe, mainly there is the following aspects:
(1) higher secondary lobe can seriously affect the frequency spectrum perception precision and efficiency of system, because side-lobe energy is excessive, because
This, when being perceived by traditional Energy-aware method, can not judge to detect signal on earth be useful signal or
Secondary lobe, this will cause a series of consequences such as erroneous judgement；
(2) in general, the signal energy sent in communication system is limited, higher secondary lobe can account for the energy of main signal
Amount, leads to the consumption and waste of energy；
(3) ofdm signal secondary lobe is excessive, and the protection interval that will lead to adjacent sub-carrier is elongated, this can reduce the frequency spectrum of system
Utilization rate and user density；
(4) OFDM is higher to the sensibility of carrier wave frequency deviation, peak-to-average force ratio with higher；
(5) each subcarrier must bandwidth having the same, must keep synchronous between each subcarrier, it is necessary to keep orthogonal,
Which has limited the flexibilities that frequency spectrum uses.
In Next-Generation Wireless Communication Systems, due to supporting the needs of high data rate, it would be possible to need to be more than 1GHz's
Spectral bandwidth.But in certain lower frequency ranges, it is difficult to obtain continuous wide-band spectrum resources, and in these frequency ranges, it is certain wireless
In Transmission system, such as television system, there are some frequency spectrum resources (blank frequency spectrum) being not used by.
But the position of these blank frequency spectrums may be discontinuous, and available bandwidth is also not necessarily identical, use
OFDM technology is difficult to realize the use to these usable spectrums.These blank frequency spectrums are flexibly and effectively utilized, are next-generation wireless
Communication system mainly considers the problems of.
In order to overcome multipath channel and high-speed wideband to wirelessly communicate bring frequency selective fading, one very naturally
Idea is exactly that multiple subbands are divided on frequency domain, so that all near flats of the spectral characteristic on each sub-channels, make simultaneously
With multiple mutually independent subband transmitting data in parallel, this lance with regard to effective solution elongation sign period and transmission rate
Shield.
In receivers using between subband orthogonality or near orthogonality separate respective information, and can be with
The frequency diversity that signal is carried out between subband, further enhances the reliability of signal, here it is the basic think ofs of multi-carrier modulation
Think.FBMC (Filter-bank Based Multicarrier, multicarrier based on wave filter group) scheme is considered as solving
The effective means of problem above.
In the implementation of the present invention, at least there are the following problems in the prior art: traditional CP- for inventor's discovery
Ofdm system becomes frequency selective fading channels with independent noise since the length of CP is greater than maximum multipath delay spread
The parallel flat fading channels of distribution.So receiving end passes through classical least square (LS, Least Square) channel estimation
Algorithm or Minimum Mean Square Error (MMSE, Minimum Mean Square Error) channel estimation method, can acquire channel and exist
The frequency response of pilot frequency locations, and then the frequency response of time frequency plane is obtained by interpolation algorithm.
But FBMC-OQAM (Orthogonally multiplexed QAM system, orthogonal multiplex QAM system,
QAM:Quadrature Amplitude Modulation: quadrature amplitude modulation) system data is after multipath channel, reception
End signal parses band demodulated signal by AFB (Analysis Filter Bank, analysis filter group), by three parts group
At: first is the product of frequency pilot sign and channel frequency response, and second is imaginary number distracter, and third is white Gaussian noise.
As it can be seen that due to the presence of imaginary number distracter, so that tradition OFDM channel estimation method is no longer desirable for FBMC system,
The accuracy of channel estimation is affected, thus in FBMC-OQAM system the key of channel estimation method be to solve how
It eliminates imaginary number distracter or carries out channel estimation using imaginary number distracter, the channel estimation that could improve FBMC-OQAM is accurate
Degree.
Summary of the invention
The purpose of the invention is to overcome the shortcomings of above-mentioned background technique, provide a kind of based on next-generation wireless waveform
The channel estimation methods and system of FBMC-OQAM interfere enhancing receiving end pilot beacon energy using intrinsic imaginary number, can effectively mention
The channel estimation accuracy of high FBMC-OQAM.
In a first aspect, providing a kind of channel estimation methods based on next-generation wireless waveform FBMC-OQAM, including following step
It is rapid:
Enhancing receiving end pilot beacon energy is interfered using intrinsic imaginary number, improves the channel estimation accuracy of FBMC-OQAM.
According in a first aspect, in the first possible implementation of the first aspect, this method specifically includes following step
It is rapid:
In transmitting terminal, the protection symbol on the left of frequency pilot sign is replaced with into data symbol, by data symbol carry out caching and
After the data that subcarrier number is even number are transformed to opposite number, it is placed in the right side of frequency pilot sign, obtains pilot beacon data, eliminated
Imaginary number interference at left and right sides of frequency pilot sign.
According to the first possible implementation of first aspect, in second of possible implementation of first aspect
In, the format of the pilot beacon data are as follows:
The arrangement regulation of data at left and right sides of frequency pilot sign are as follows:
When subcarrier number is even number, right side data are the opposite numbers of left data；
When subcarrier number is odd number, right side data are identical as left data.
According to the first possible implementation of first aspect, in the third possible implementation of first aspect
In, this method is further comprising the steps of:
Transmitting terminal eliminates the imaginary number interference of the frequency pilot sign or more two sides using interference cancellation algorithm ICM.
According to the first possible implementation of first aspect, in the 4th kind of possible implementation of first aspect
In, this method is further comprising the steps of:
In receiving end, after phase compensation, pseudo pilot symbol is obtained, is formulated as follows:
Wherein, c is time-frequency lattice point frequency pilot sign,Expression pseudo pilot symbol, line number of the p for time-frequency lattice point, p=0,
1 ..., M-1, M are subcarrier number, and j is imaginary unit, and a indicates that the numerical value of certain moment frequency pilot sign, β indicate interference weight system
Number, mod represent complementation operation.
Second aspect provides a kind of channel estimation system based on next-generation wireless waveform FBMC-OQAM, including transmitting terminal
And receiving end, the system improve the channel estimation of FBMC-OQAM using the pilot beacon energy of intrinsic imaginary number interference enhancing receiving end
Accuracy.
According to second aspect, in the first possible implementation of the second aspect, the transmitting terminal is by frequency pilot sign
The protection symbol in left side replaces with data symbol, and data symbol is carried out caching and converts the data that subcarrier number is even number
After opposite number, it is placed in the right side of frequency pilot sign, obtains pilot beacon data, eliminates the imaginary number interference at left and right sides of frequency pilot sign.
According to the first possible implementation of second aspect, in second of possible implementation of second aspect
In, the format of the pilot beacon data are as follows:
The arrangement regulation of data at left and right sides of frequency pilot sign are as follows:
When subcarrier number is even number, right side data are the opposite numbers of left data；
When subcarrier number is odd number, right side data are identical as left data.
According to the first possible implementation of second aspect, in the third possible implementation of second aspect
In, the transmitting terminal eliminates the imaginary number interference of the frequency pilot sign or more two sides using ICM algorithm.
According to the first possible implementation of second aspect, in the 4th kind of possible implementation of second aspect
In, the receiving end obtains pseudo pilot symbol after phase compensation, it is formulated as follows:
Wherein, c is time-frequency lattice point frequency pilot sign,Expression pseudo pilot symbol, line number of the p for time-frequency lattice point, p=0,
1 ..., M-1, M are subcarrier number, and j is imaginary unit, and a indicates that the numerical value of certain moment frequency pilot sign, β indicate interference weight system
Number, mod represent complementation operation.
Compared with prior art, advantages of the present invention is as follows:
The embodiment of the present invention is arranged with reference to the intermediate pilot of classical IAM algorithm, proposes a kind of bulk of high-efficiency frequency spectrum
Pilot tone algorithm for estimating IAM-EP interferes enhancing receiving end pilot beacon energy using intrinsic imaginary number, to improve the channel of FBMC-OQAM
Accuracy of estimation.By test, IAM-EP algorithm provided in an embodiment of the present invention than traditional IAM method with better performance with
Channel estimation accuracy.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the pilot beacon data of IAM-EP algorithm in the embodiment of the present invention.
Fig. 2 is the structural schematic diagram of FBMC-OQAM channel estimation and channel equalization model in the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described in further detail.
Embodiment 1
The embodiment of the present invention provides a kind of channel estimation methods based on next-generation wireless waveform FBMC-OQAM, including with
Lower step:
Enhancing receiving end pilot beacon energy is interfered using intrinsic imaginary number, improves the channel estimation accuracy of FBMC-OQAM.
This method specifically includes the following steps:
In transmitting terminal, the protection symbol on the left of frequency pilot sign is replaced with into data symbol, by data symbol carry out caching and
After the data that subcarrier number is even number are transformed to opposite number, it is placed in the right side of frequency pilot sign, obtains pilot beacon data, eliminated
Imaginary number interference at left and right sides of frequency pilot sign.
It is shown in Figure 1, the format of pilot beacon data are as follows:
The arrangement regulation of data at left and right sides of frequency pilot sign are as follows:
When subcarrier number is even number, right side data are the opposite numbers of left data；
When subcarrier number is odd number, right side data are identical as left data.
Further, this method is further comprising the steps of: transmitting terminal uses ICM (Interference Cancellation
Method, interference cancellation algorithm) algorithm eliminate the frequency pilot sign up and down two sides imaginary number interference.
Further, shown in Figure 2, this method is further comprising the steps of:
In receiving end, after phase compensation, pseudo pilot symbol is obtained, is formulated as follows:
Wherein, c is time-frequency lattice point frequency pilot sign,Expression pseudo pilot symbol, line number of the p for time-frequency lattice point, p=0,
1 ..., M-1, M are subcarrier number, and j is imaginary unit, and α indicates that the numerical value of certain moment frequency pilot sign, β indicate interference weight system
Number, mod represent complementation operation.
The embodiment of the present invention designs an IAM-EP (Interference Approximation Method-Extend
Pilot, enhancing pilot beacon interference are approximate) algorithm, so that each frequency pilot sign on time-frequency lattice point in FBMC-OQAM system
It can reduce and be interfered by the imaginary number of surrounding symbol, can effectively solve the problem that intrinsic imaginary number is interfered to channel estimation under non-ideal communication channel
With the larger problem of channel equalization bring.
Embodiment 2
The embodiment of the present invention provides a kind of channel estimation system based on next-generation wireless waveform FBMC-OQAM, including hair
Sending end and receiving end, the system improve the channel of FBMC-OQAM using the pilot beacon energy of intrinsic imaginary number interference enhancing receiving end
Accuracy of estimation.
Specifically, the protection symbol on the left of frequency pilot sign is replaced with data symbol by transmitting terminal, and data symbol is carried out
After caching and the data that subcarrier number is even number being transformed to opposite number, it is placed in the right side of frequency pilot sign, obtains pilot beacon number
According to the imaginary number at left and right sides of elimination frequency pilot sign interferes.
It is shown in Figure 1, the format of pilot beacon data are as follows:
The arrangement regulation of data at left and right sides of frequency pilot sign are as follows:
When subcarrier number is even number, right side data are the opposite numbers of left data；
When subcarrier number is odd number, right side data are identical as left data.
Further, transmitting terminal eliminates the imaginary number interference of the frequency pilot sign or more two sides using ICM algorithm.
Further, shown in Figure 2, receiving end obtains pseudo pilot symbol after phase compensation, be formulated as
Under:
Wherein, c is time-frequency lattice point frequency pilot sign,Expression pseudo pilot symbol, line number of the p for time-frequency lattice point, p=0,
1 ..., M-1, M are subcarrier number, and j is imaginary unit, and a indicates that the numerical value of certain moment frequency pilot sign, β indicate interference weight system
Number, mod represent complementation operation.
The embodiment of the present invention designs an enhancing pilot beacon and interferes approximate algorithm IAM-EP, so that in FBMC-OQAM system
Each frequency pilot sign can reduce the imaginary number interference by surrounding symbol on middle time-frequency lattice point, can effectively solve the problem that non-ideal
Intrinsic imaginary number is interfered to channel estimation and the larger problem of channel equalization bring under channel.
Embodiment 3
The embodiment of the present invention proposes a kind of Block-type pilot algorithm for estimating of high-efficiency frequency spectrum, designs an IAM-EP algorithm, this
Inventive embodiments are accurate with the channel estimation for improving FBMC-OQAM using intrinsic imaginary number interference enhancing receiving end pilot beacon energy
Degree, and performance is then similar to traditional IAM scheduling algorithm.
In traditional IAM algorithm, it can be used to estimate an only intermediate column frequency pilot sign for the frequency response of channel, and its
The frequency pilot sign of two column of left and right is the intrinsic imaginary part interference for being used merely to be calculated intermediate pilot symbol, can not be used to calculate
The channel frequency response of character position where it.The embodiment of the present invention is mentioned using the pilot symbol information of this two column zero setting of left and right
The precision of high radio channel estimation.
Symbol time-frequency lattice point in wireless signal transmissionWherein, ap,qFor the symbol of transmission
Number, jup,qIt is interfered for intrinsic imaginary part,It being properly termed as again " pilot beacon " (pseudo pilot), p is the line number of time-frequency lattice point,
Q is the columns of time-frequency lattice point.
If channel frequency response coefficient can be estimated by reasonable pilot design, ignore the influence of white Gaussian noise,
LS channel estimation and equalization algorithm (least square method) are then directly utilized, can be obtainedReal part is taken to it again, can be obtained
The symbol a of transmissionp,q。
It is shown in Figure 2, in the channel estimation and channel equalization model of FBMC-OQAM system, under normal circumstances, send
End is in C2RmIt is inserted into pilot tone after (Complex-to-Real, multiple real-turn are changed) module, by SFB after phase bias
(Synthesis Filter Bank, synthesis filter group), data pass through multipath channel after parallel-serial conversion.
Receiving end receives signal r (t), after serioparallel exchange, using AFB matched filtering, exports complex dataIts
In, r (t) is the signal function that time t is received, and m is m-th of carrier wave, and n is nth path.
Complex data at this time, on the one hand, by known pilot symbols and pilot frequency locations, channel estimation module obtains channel
Parameter；On the other hand, it is carried out after channel equalization module processing using receiving end using the channel parameter estimated
After phase compensation, complex signal is obtained, obtained complex signal is by taking real part and R2Cm(Real-to-Complex, real multiple conversion)
Symbol to be demodulated can be obtained in module.
Specifically, least square method or lms algorithm can be used, pilot frequency locations are estimated.Estimate pilot tone
Behind position, channel is obtained in the frequency response of pilot frequency locations using interpolation calculation.
The embodiment of the present invention uses the channel estimation methods of Block-type pilot, combines the approximate elimination algorithm of classical interference
The advantages of (IAM, Interference Approximation Method), devises a kind of high-efficiency frequency spectrum and utilizes Block-type pilot
The new algorithm IAM-EP of channel estimation.
According to " immediate neighbor " of time-frequency lattice point (p, q) to the relationship and subcarrier base letter of interference weight coefficient presentation
The number interference weight coefficient regularity of distribution, it is known that: frequency pilot sign ap,q" immediate neighbor " four angles to Pilot Interference weight coefficient
It is identical, and frequency pilot sign or so and upper and lower symbol are opposite to frequency pilot sign interference weight coefficient.Therefore, in pilot tone
The unknown data symbol of filling certain rule arrangement, makes unknown data symbol to frequency pilot sign in " immediate neighbor " range of symbol
Interference cancel out each other, therefore, can be in three symbol periods of needs that pilot tone occupies in classic algorithm IAM and ICM algorithm
Portion transfers data symbol can significantly improve the availability of frequency spectrum.
The embodiment of the present invention interferes particular kind of relationship existing for weight coefficient between utilizing subcarrier basic function, will be in IAM algorithm
Complete zero " protection symbol " on the left of frequency pilot sign replaces with unknown, random data symbol, the data on the left of frequency pilot sign
Symbol is placed on the right side of frequency pilot sign, at this point, frequency pilot sign by data buffer storage and after carrying out sign reversing to partial data
Left and right sides data arrangement rule are as follows: when subcarrier number is even number, right side data are the opposite numbers in left side；Subcarrier number is
When odd number, right side data are identical as left data.
Two side datas are mutually supported according to the interference that arrangement mode above generates the pilot tone that intermediate subcarrier number is odd number
Disappear, therefore, " immediate neighbor " interference of intermediate pilot symbol comes solely from the pilot tone up and down of frequency pilot sign column.
If the arrangement mode of the arrangement selection ICM algorithm of middle column frequency pilot sign, then intermediate pilot symbol is " directly adjacent
The interference up and down in residence " is also eliminated.
So far, the imaginary number interference up and down of " immediate neighbor " of intermediate pilot symbol is completely eliminated.It is calculated using LS
After method estimates pilot frequency locations, by interpolation method, the frequency response of channel can be obtained.
It is to be noted that the imaginary number interference in " immediate neighbor " of intermediate pilot symbol is only odd number in subcarrier number
Pilot tone on cancel out each other.
Embodiment 4
Shown in Figure 1 by taking IAM-EP algorithm as an example as preferred embodiment, transmitting terminal will be on the left of frequency pilot sign
Protection symbol replace with data symbol, by data symbol carry out caching and by subcarrier number be even number data be transformed to phase
After anti-number, it is placed in the right side of frequency pilot sign, obtains pilot beacon data, eliminates the imaginary number interference at left and right sides of frequency pilot sign.
F in Fig. 10For sub-carrier frequencies interval, τ0Indicate the time delay in arrival path, ordinate F represents frequency, abscissa T
Represent the time.
It is shown in Figure 1, the format of pilot beacon data are as follows:
The arrangement regulation of data at left and right sides of frequency pilot sign are as follows:
When subcarrier number is even number, right side data are the opposite numbers of left data；
When subcarrier number is odd number, right side data are identical as left data.
For frequency pilot sign, receiving end obtains pseudo pilot symbol after phase compensation, can be indicated with following equation:
Wherein, c is time-frequency lattice point frequency pilot sign,Expression pseudo pilot symbol, line number of the p for time-frequency lattice point, p=0,
1 ..., M-1, M are subcarrier number, and j is imaginary unit, and a indicates that the numerical value of certain moment frequency pilot sign, β indicate interference weight system
Number, mod represent complementation operation.
The pilot beacon ability of IAM-EP algorithm is bigger than traditional IAM algorithm energy, but frequency pilot sign introduces in IAM-EP algorithm
Pure imaginary number can generate real number interference to leftward position data symbol, need to eliminate interference after taking real part by extra process,
Increase certain complexity.
In practical engineering applications, the prototype of more excellent performance can be selected to filter by the range of increase " immediate neighbor "
Wave device and the higher channel estimation of choice accuracy and Channel Equalization Algorithm, to eliminate the expense of performance, bring cost therewith
It is the reduction of spectrum efficiency and the promotion of system complexity.
General nearest " immediate neighbor " refers to the row, column (p, q) of pilot tones a respectively plus 1, such as: ap+1,q+1It is exactly one
A " immediate neighbor " increases " immediate neighbor " and refers to such as ap+2,q+2Or ap-2,q-2Deng.
Shown in Figure 2, the channel estimation steps of practical FBMC-OQAM are as follows:
In transmitting terminal, wireless signal enters C2R after ovennodulationmComplex signal is become real signal, is inserted into later by module
Pilot data；By SFB module after phase bias, SFB module runs IAM-EP algorithm, pilot beacon data is added, and go here and there and turn
Rear data are changed by multipath channel.
In receiving end, receives signal r (t) and pass through serioparallel exchange, then analyze pilot beacon data using AFB, and match
Filtering output complex dataOn the one hand the complex data obtains letter by known pilot symbols and pilot frequency locations channel estimation module
On the other hand road parameter using the channel parameter and pilot beacon data estimated after channel equalization module processing, then passes through
It crosses after receiving end carries out phase compensation and obtains complex signal, obtained complex signal is by taking real part and R2CmModule can be obtained wait solve
The symbol of tune.
The embodiment of the present invention is arranged with reference to the intermediate pilot of classical IAM algorithm, proposes a kind of bulk of high-efficiency frequency spectrum
Pilot tone algorithm for estimating IAM-EP interferes enhancing receiving end pilot beacon energy using intrinsic imaginary number, to improve the channel of FBMC-OQAM
Accuracy of estimation.By test, IAM-EP algorithm provided in an embodiment of the present invention than traditional IAM method with better performance with
Channel estimation accuracy.
Those skilled in the art can carry out various modifications to the embodiment of the present invention and modification, if these modifications and change
For type within the scope of the claims in the present invention and its equivalent technologies, then these modifications and variations are also in protection scope of the present invention
Within.
The prior art that the content being not described in detail in specification is known to the skilled person.
Claims (10)
1. a kind of channel estimation methods based on next-generation wireless waveform FBMC-OQAM, which comprises the following steps:
Enhancing receiving end pilot beacon energy is interfered using intrinsic imaginary number, improves the channel estimation accuracy of FBMC-OQAM.
2. the channel estimation methods as described in claim 1 based on next-generation wireless waveform FBMC-OQAM, it is characterised in that:
This method specifically includes the following steps:
In transmitting terminal, the protection symbol on the left of frequency pilot sign is replaced with into data symbol, by data symbol carry out caching and will be sub
Carrier index is after the data of even number are transformed to opposite number, to be placed in the right side of frequency pilot sign, obtains pilot beacon data, eliminates pilot tone
Imaginary number interference at left and right sides of symbol.
3. the channel estimation methods as claimed in claim 2 based on next-generation wireless waveform FBMC-OQAM, it is characterised in that:
The format of the pilot beacon data are as follows:
The arrangement regulation of data at left and right sides of frequency pilot sign are as follows:
When subcarrier number is even number, right side data are the opposite numbers of left data；
When subcarrier number is odd number, right side data are identical as left data.
4. the channel estimation methods as claimed in claim 2 based on next-generation wireless waveform FBMC-OQAM, it is characterised in that:
This method is further comprising the steps of:
Transmitting terminal eliminates the imaginary number interference of the frequency pilot sign or more two sides using interference cancellation algorithm ICM.
5. the channel estimation methods as claimed in claim 2 based on next-generation wireless waveform FBMC-OQAM, it is characterised in that:
This method is further comprising the steps of:
In receiving end, after phase compensation, pseudo pilot symbol is obtained, is formulated as follows:
Wherein, c is time-frequency lattice point frequency pilot sign,Indicate pseudo pilot symbol, p is the line number of time-frequency lattice point, p=0,1 ..., M-
1, M is subcarrier number, and j is imaginary unit, and a indicates that the numerical value of certain moment frequency pilot sign, β indicate interference weight coefficient, mod generation
Table complementation operation.
6. a kind of channel estimation system based on next-generation wireless waveform FBMC-OQAM, including transmitting terminal and receiving end, feature
It is:
The system enhances the pilot beacon energy of receiving end using the interference of intrinsic imaginary number, and the channel estimation for improving FBMC-OQAM is accurate
Degree.
7. the channel estimation system as claimed in claim 6 based on next-generation wireless waveform FBMC-OQAM, it is characterised in that:
Protection symbol on the left of frequency pilot sign is replaced with data symbol by the transmitting terminal, data symbol is carried out caching and by subcarrier
Number is after the data of even number are transformed to opposite number, to be placed in the right side of frequency pilot sign, obtains pilot beacon data, eliminates frequency pilot sign
The imaginary number of the left and right sides interferes.
8. the channel estimation system as claimed in claim 7 based on next-generation wireless waveform FBMC-OQAM, it is characterised in that:
The format of the pilot beacon data are as follows:
The arrangement regulation of data at left and right sides of frequency pilot sign are as follows:
When subcarrier number is even number, right side data are the opposite numbers of left data；
When subcarrier number is odd number, right side data are identical as left data.
9. the channel estimation system as claimed in claim 7 based on next-generation wireless waveform FBMC-OQAM, it is characterised in that:
The transmitting terminal eliminates the imaginary number interference of the frequency pilot sign or more two sides using ICM algorithm.
10. the channel estimation system as claimed in claim 7 based on next-generation wireless waveform FBMC-OQAM, it is characterised in that:
The receiving end obtains pseudo pilot symbol after phase compensation, is formulated as follows:
Wherein, c is time-frequency lattice point frequency pilot sign,Indicate pseudo pilot symbol, p is the line number of time-frequency lattice point, p=0,1 ..., M-
1, M is subcarrier number, and j is imaginary unit, and a indicates that the numerical value of certain moment frequency pilot sign, β indicate interference weight coefficient, mod generation
Table complementation operation.
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