CN106789762A - FBMC pilot-based channel estimation methods and device - Google Patents
FBMC pilot-based channel estimation methods and device Download PDFInfo
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- CN106789762A CN106789762A CN201610319285.4A CN201610319285A CN106789762A CN 106789762 A CN106789762 A CN 106789762A CN 201610319285 A CN201610319285 A CN 201610319285A CN 106789762 A CN106789762 A CN 106789762A
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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
Abstract
A kind of FBMC pilot-based channel estimation methods and device, methods described include：Data transfer signal is received, and the symbol on the corresponding Resource Block of the first pilot signal is demodulated from the data transfer signal, the Resource Block includes first resource block and Secondary resource block, the symbol demodulated on first resource block is the first symbol；The symbol demodulated on Secondary resource block is the second symbol；The real part x of first pilot signal1With imaginary part x2It is 0；According to first symbol and second symbol, the phase of the pilot channel is estimated；According to the phase of the pilot channel estimated and obtain, the amplitude of the pilot channel is estimated；According to the phase and amplitude of the pilot channel, the pilot channel is estimated.Such scheme can reduce the power of auxiliary pilot symbols, improve the equivalent Signal to Interference plus Noise Ratio of data symbol, while compatible with the pilot frequency configuration of LTE.
Description
Technical field
The present invention relates to wireless communication field, more particularly to a kind of FBMC pilot-based channel estimation methods and device.
Background technology
Filter bank multi-carrier (Filtered Bank Multi-Carrier, FBMC) is the frequency based on subcarrier
Spectrum forming technique, wave filter group is obtained by a ptototype filter and its frequency displacement, so as to realize parallel many
Carrier-wave transmission.Combined with FBMC offset modulations, it is possible to use its I/Q independence expands transmission rate, from
And cause that spectrum efficiency exceedes OFDM (Orthogonal Frequency Division
Multiplexing, OFDM).
FBMC removes time domain, the interference of frequency domain adjacent signals using real orthogonality, but when channel frequency rings
When should be plural number, real orthogonality cannot just meet.To meet real orthogonality, in the prior art, using auxiliary
Assistant director of a film or play's frequency (Auxiliary Pilot, AP) method, will come from imaginary part on the position of auxiliary pilot symbols
Interference is set to 0.
Existing auxiliary pilot method is carried out in channel estimation, it is necessary to for auxiliary pilot symbols distribute larger
Power, causes for the power of data symbol distribution is smaller, the data symbol for then causing receiving terminal to receive
Equivalent Signal to Interference plus Noise Ratio it is relatively low.
The content of the invention
Present invention solves the technical problem that being how to carry out auxiliary pilot to carry out channel estimation to reduce auxiliary
The power of frequency pilot sign, improves the equivalent Signal to Interference plus Noise Ratio of data symbol.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of FBMC pilot-based channel estimation methods,
Including：Data transfer signal is received, and the first pilot signal pair is demodulated from the data transfer signal
The symbol on Resource Block answered, the Resource Block includes first resource block and Secondary resource block, described first
Resource Block is the real part x for transmitting first pilot signal1Resource Block, and on the first resource block solve
The symbol for recalling is the first symbol；The Secondary resource block is the imaginary part x for transmitting first pilot signal2
Resource Block, and the symbol demodulated on the Secondary resource block be the second symbol；The first pilot tone letter
Number real part x1With imaginary part x2It is 0；According to first symbol and second symbol, institute is estimated
State the phase of pilot channel；According to the phase of the pilot channel estimated and obtain, led described in estimation
The amplitude of frequency channel；According to the phase and amplitude of the pilot channel, the pilot channel is estimated.
Optionally, the phase for estimating the pilot channel includes：Calculate first symbol and institute
State the rotatable phase of the second symbol so that according to postrotational first symbol of the rotatable phase on real axis
Projected length of the projected length with postrotational second symbol in the imaginary axis it is equal；By the rotatable phase
Negate, the inverted value for obtaining as the pilot channel phase.
Optionally, the rotatable phase is：It is all to enable to postrotational first symbol on real axis
In the equal phase value of projected length of the projected length with postrotational second symbol in the imaginary axis, projection length
Spend minimum phase value.
Optionally, it is described according to first symbol and second symbol, estimate the pilot channel
Phase include：：When the imaginary part of first symbol is more than or equal to the real part product of second symbol
When 0, the phase of the pilot channel is estimated using equation below：Work as institute
When the real part product of the imaginary part and second symbol of stating the first symbol is less than or equal to 0, using following public affairs
Formula estimates the phase of the pilot channel：Wherein,For the pilot tone is believed
The phase in road, y1It is the first symbol, y2It is the second symbol,To take y2Imaginary part function,
To take y1Real part function,To take y2Real part function,To take y1Imaginary part
Function.
Optionally, the data transfer signal also includes：Second pilot signal, second pilot signal
Corresponding Resource Block includes information resources block and the 4th Resource Block, and the information resources block is described for transmission
The real part x of the second pilot signal3Resource Block, and the symbol demodulated on the information resources block be the 3rd
Symbol；4th Resource Block is the imaginary part x for transmitting second pilot signal4Resource Block, it is and described
The symbol demodulated on 4th Resource Block is the 4th symbol；The real part x of second pilot signal3With imaginary part
x40 is not all, and the corresponding pilot channel of second pilot signal is corresponding with first pilot signal
Pilot channel is identical.
Optionally, the amplitude for estimating the pilot channel includes：By the 3rd symbol and described
4th symbol is rotated according to the phase of the pilot channel；According to postrotational 3rd symbol and rotation
The 4th symbol after turning, estimates the amplitude of the pilot channel.
Optionally, the amplitude for estimating the pilot channel, is carried out using equation below：Wherein, hampIt is the amplitude of the pilot channel,
y3It is the 3rd symbol, y4It is the 4th symbol,It is postrotational 3rd symbol y3,
It is postrotational 4th symbol y4。
Optionally, the phase and amplitude according to the pilot channel, estimates the pilot channel,
Carried out using equation below：Wherein, hampIt is the amplitude of the pilot channel, h is
The pilot channel for estimating,It is the phase of the pilot channel.
Optionally, the phase and amplitude according to the pilot channel, estimates the pilot channel,
Carried out using equation below：Wherein：hampIt is the amplitude of the pilot channel, h is
The pilot channel for estimating,It is hampReal part,It is the phase of the pilot channel.
To solve the above problems, the embodiment of the present invention additionally provides a kind of FBMC pilot channel estimations device,
Including：Receiving unit, for receiving data transfer signal：Demodulating unit, for from the data transfer
The symbol on the corresponding Resource Block of the first pilot signal is demodulated in signal, the Resource Block includes the first money
Source block and Secondary resource block, the first resource block are the real part x for transmitting first pilot signal1Money
The symbol demodulated in source block, and the first resource block is the first symbol；The Secondary resource block is biography
The imaginary part x of defeated first pilot signal2Resource Block, and the symbol demodulated on the Secondary resource block
It is the second symbol；The real part x of first pilot signal1With imaginary part x2It is 0；Phase estimation unit,
For according to first symbol and second symbol, estimating the phase of the pilot channel；Amplitude
Estimation unit, for the phase according to the pilot channel estimated and obtain, estimates the pilot tone letter
The amplitude in road；Pilot channel estimation unit, for phase and amplitude according to the pilot channel, estimates
Count out the pilot channel.
Optionally, the phase estimation unit, for calculating first symbol and second symbol
Rotatable phase so that according to projected length of postrotational first symbol of the rotatable phase on real axis
It is equal with projected length of postrotational second symbol in the imaginary axis；The rotatable phase is negated, is obtained
Inverted value as the pilot channel phase.
Optionally, the rotatable phase is：It is all to enable to postrotational first symbol on real axis
In the equal phase value of projected length of the projected length with postrotational second symbol in the imaginary axis, projection length
Spend minimum phase value.
Optionally, the phase estimation unit, for the imaginary part when first symbol and the described second symbol
Number real part product when being more than or equal to 0, the phase of the pilot channel is estimated using equation below：When the imaginary part of first symbol is small with the real part product of second symbol
When 0, the phase of the pilot channel is estimated using equation below：Wherein,It is the phase of the pilot channel, y1It is the first symbol, y2
It is the second symbol,To take y2Imaginary part function,To take y1Real part function,
To take y2Real part function,To take y1Imaginary part function.
Optionally, the data transfer signal also includes：Second pilot signal, second pilot signal
Corresponding Resource Block includes information resources block and the 4th Resource Block, and the information resources block is described for transmission
The real part x of the second pilot signal3Resource Block, and the symbol demodulated on the information resources block be the 3rd
Symbol；4th Resource Block is the imaginary part x for transmitting second pilot signal4Resource Block, it is and described
The symbol demodulated on 4th Resource Block is the 4th symbol；The real part x of second pilot signal3With imaginary part
x40 is not all, and the corresponding pilot channel of second pilot signal is corresponding with first pilot signal
Pilot channel is identical.
Optionally, the amplitude Estimation unit, for the 3rd symbol and the 4th symbol to be pressed
Phase according to the pilot channel is rotated；According to postrotational 3rd symbol and the postrotational 4th
Symbol, estimates the amplitude of the pilot channel.
Optionally, the amplitude Estimation unit, the width for estimating the pilot channel using equation below
Degree：Wherein, hampIt is the width of the pilot channel
Degree, y3It is the 3rd symbol, y4It is the 4th symbol,It is postrotational 3rd symbol y3,It is postrotational 4th symbol y4。
Optionally, the pilot channel estimation unit, for estimating the pilot channel using equation below：Wherein, hampIt is the amplitude of the pilot channel,It is the phase of the pilot channel
The inverted value of position, h is the pilot channel for estimating.
Optionally, the pilot channel estimation unit, for estimating the pilot channel using equation below：Wherein：hampIt is the amplitude of the pilot channel,It is the phase of the pilot channel
The inverted value of position, h is the pilot channel for estimating,It is hampReal part.
Compared with prior art, the technical scheme of the embodiment of the present invention has the advantages that：
When pilot channel estimation is carried out, the real part and imaginary part of the first pilot signal are disposed as 0.Connecing
In the data transfer signal for receiving, obtain on the first symbol and Secondary resource block on first resource block
Second symbol, the phase based on the first symbol and the second sign estimation pilot channel, and believed according to pilot tone
The amplitude of the phase estimation pilot channel in road, such that it is able to estimate pilot channel.From the foregoing, it will be observed that above-mentioned
Scheme need not set special auxiliary pilot symbols to eliminate the interference from imaginary part on pilot frequency symbol position,
Such that it is able to reduce the power of auxiliary pilot symbols, the equivalent Signal to Interference plus Noise Ratio of data symbol is improved.Additionally,
Such scheme is compatible with the pilot frequency configuration of LTE, is modified without the pilot frequency configuration to LTE.
Further, when rotatable phase is calculated, postrotational first symbol is enabled in real axis from all
On the equal phase value of projected length of the projected length with postrotational second symbol in the imaginary axis in, choosing
The minimum phase value of projected length is taken as rotatable phase, the precision of phase estimation can be improved.
Brief description of the drawings
Fig. 1 is a kind of symbol distribution map of existing data transfer signal；
Fig. 2 is a kind of flow chart of the FBMC pilot-based channel estimation methods in the embodiment of the present invention；
Fig. 3 is a kind of structural representation of the FBMC pilot channel estimations device in the embodiment of the present invention.
Specific embodiment
FBMC removes time domain, the interference of frequency domain adjacent signals using real orthogonality, but when channel frequency rings
When should be plural number, real orthogonality cannot just meet.To meet real orthogonality, in the prior art, using auxiliary
Assistant director of a film or play's frequency (Auxiliary Pilot, AP) method, will come from imaginary part on the position of auxiliary pilot symbols
Interference is set to 0.
Reference picture 1, sends on the corresponding Resource Block of real part (the black bars region in Fig. 1) of pilot tone
Symbol x0, after FBMC modulation and demodulation, the symbol on the corresponding Resource Block of real part of pilot tone becomes
y0, in the ideal case,Wherein,It is the data symbol sent around pilot tone
Corresponding Resource Block；It is fixed coefficient, correspondence FBMC sends plus receiving filter is in the domain of time-frequency two
Shock response, k=1,2 ... ..., 44.
In existing auxiliary pilot method, in Resource Block s2Upper transmission auxiliary pilot, remaining skUpper transmission
Data symbol.To ensure y0In imaginary part be 0, be calculatedSo that y0In only
Including x0。
However, in existing auxiliary pilot method, Resource Block s2On symbol be a stochastic variable, hair
Sending end is sending Resource Block s2On auxiliary pilot when, it is necessary to be Resource Block s2The more transmission power of distribution,
Cause for the transmission power of other data symbols distribution is smaller, the data symbols for then causing receiving terminal to receive
Number equivalent Signal to Interference plus Noise Ratio it is relatively low.
In embodiments of the present invention, when pilot channel estimation is carried out, by the real part of the first pilot signal and
Imaginary part is disposed as 0.In the data transfer signal for receiving, the first symbol on first resource block is obtained
And the second symbol on Secondary resource block, based on the first symbol and the second sign estimation pilot channel
Phase, and the phase estimation pilot channel according to pilot channel amplitude, such that it is able to estimate pilot tone letter
Road.From the foregoing, it will be observed that such scheme need not set special auxiliary pilot symbols to eliminate pilot frequency symbol position
On the interference from imaginary part, such that it is able to reduce the power of auxiliary pilot symbols, improve data symbol etc.
Effect Signal to Interference plus Noise Ratio.Additionally, such scheme is compatible with the pilot frequency configuration of LTE, match somebody with somebody without the pilot tone to LTE
Put and be modified.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to
Accompanying drawing is described in detail to specific embodiment of the invention.
A kind of FBMC pilot-based channel estimation methods are the embodiment of the invention provides, reference picture 2 is below led to
Specific steps are crossed to be described in detail.
Step S201, receives data transfer signal, and first is demodulated from the data transfer signal and lead
Symbol on the corresponding Resource Block of frequency signal.
In specific implementation, transmitting terminal can be pre-set at some according to existing communication protocol
Fixation subcarrier on send the first pilot signal, the first pilot signal can include real part x1And imaginary part
x2.Data symbol can be generated data transfer signal, data transfer by transmitting terminal together with the first pilot signal
Signal by wireless channel by after FBMC modulation, sending to receiving terminal.
Receiving terminal is solved after the data transfer signal for receiving transmitting terminal transmission to data transfer signal
Reason is mediated, the symbol on the corresponding Resource Block of the first pilot signal can be demodulated from data transfer signal.
Because the first pilot signal includes real part x1With imaginary part x2, therefore the corresponding Resource Block of the first pilot signal can
With including first resource block and Secondary resource block, wherein：First resource block is the first pilot signal of transmission
Real part x1Resource Block, the symbol demodulated on first resource block be the first symbol；Secondary resource block is
Transmit the imaginary part x of the first pilot signal2Resource Block, the symbol demodulated on Secondary resource block be second symbol
Number.
In embodiments of the present invention, the real part x of the first pilot signal1With imaginary part x2Could be arranged to 0.
Using the orthogonality of FBMC, the first symbol y on first resource block can be obtained1And Secondary resource block
On the second symbol y2, specially：
Wherein, n1、n2It is real number, the interference that respectively data symbol on surrounding resources block brings；H is
The pilot channel for obtaining is estimated in the embodiment of the present invention.
Step S202, according to first symbol and second symbol, estimates the pilot channel
Phase.
In embodiments of the present invention, in the phase of estimating pilot frequency channel, the first symbol y can first be calculated1With
And the second symbol y2Rotatable phaseSo that according to rotatable phasePostrotational first symbol is in reality
The projected length of projected length on axle with postrotational second symbol in the imaginary axis is equal.It is being calculated
Rotatable phaseAfterwards, rotatable phase is negated, the inverted value for obtaining can be used as the phase of pilot channel.
In the ideal case, according to the first symbol y provided in step S2011And the second symbol y2, meter
The rotatable phase for obtainingFollowing relation should be met：
Wherein,To takeThe function of real part,To takeThe function of imaginary part.
Because formula (2) includes that the equation in two equations and a unknown number, therefore formula (2) is excessively fixed,
The rotatable phase for being solved by two equations in the ideal caseIt is equal.But, in actual applications,
There is the interference of noise in data transmission procedure, correspondingly, the first symbol y being disturbed1And second
Symbol y2Expression formula be：
Wherein, ν1And ν2It is multiple noise.
Now, two equations in formula (2) are solvedValue may be unequal.In embodiments of the present invention,
For formula (3), following goal expression can be provided：
The implication of formula (4) is：Take all projections for enabling to postrotational first symbol on real axis long
Spend in the equal phase value of projected length with postrotational second symbol in the imaginary axis, projected length is minimum
Phase value.Namely there may be multiple enable to projection of postrotational first symbol on real axis long
The equal phase value of projected length with postrotational second symbol in the imaginary axis is spent, but is therefrom only chosen
The minimum phase value of projected length is used as rotatable phase.
According to formula (4), in an embodiment of the present invention, when the imaginary part of the first symbolWith the second symbol
Real partProduct be more than or equal to 0 when, using the phase of equation below (5) estimating pilot frequency channel
Position
When the imaginary part of the first symbolWith the real part of the second symbolProduct be less than or equal to 0
When, using the phase of equation below (6) estimating pilot frequency channel
Obtaining the phase of pilot channelAfterwards, step S203 is performed.
As can be seen here, when rotatable phase is calculated, postrotational first symbol is enabled in reality from all
In the equal phase value of the projected length of projected length on axle with postrotational second symbol in the imaginary axis,
The minimum phase value of projected length is chosen as rotatable phase, the precision of phase estimation can be improved.
It is understood that in actual applications, rotation phase can also be tried to achieve using other methods
PositionThe rotatable phase acquiring method provided in the above embodiment of the present invention is provided.
Step S203, according to the phase of the pilot channel estimated and obtain, estimates the pilot tone letter
The amplitude in road.
In specific implementation, can be according to the real part of postrotational first symbol and postrotational second symbol
Imaginary part, estimate the amplitude of the pilot channel.However, as the real part x of the first pilot signal1With imaginary part
x2When being 0, it is difficult to further according to the amplitude of the first pilot signal estimating pilot frequency channel.Therefore, it is also desirable to
Using other methods come the amplitude of estimating pilot frequency channel.
In embodiments of the present invention, the second pilot signal, and second can be set in data transfer signal
Resource Block shared by pilot signal and the Resource Block shared by the first pilot signal are simultaneously differed.Namely
In data transfer signal, including two pilot signals：First pilot signal and the second pilot signal.
Second pilot signal equally includes real part and imaginary part, and the Resource Block shared by the second pilot signal includes
Information resources block and the 4th Resource Block, wherein：Information resources block is the real part for transmitting the second pilot signal
x3Resource Block, and the symbol demodulated on information resources block be the 3rd symbol；4th Resource Block is transmission
The imaginary part x of the second pilot signal4Resource Block, and the symbol demodulated on the 4th Resource Block be the 4th symbol.
It should be noted that the real part x of the second pilot signal3With imaginary part x4Can not all 0, and the second pilot tone
The corresponding pilot channel of signal pilot channel corresponding with the first pilot signal is identical.
In actual applications, pilot channel it is identical can refer to two pilot channels channel gain it is equal or
It is very close to.For example, carrying the subcarrier of the first pilot signal on frequency domain and carrying the second pilot signal
Subcarrier be adjacent sub-carrier in same FBMC symbols, so, two subcarriers are each corresponded to
Pilot channel can be approximate regard identical pilot channel as.And for example, the first pilot signal and second
Position of the pilot signal in time domain is respectively identical sub-carrier positions in adjacent FBMC symbols, then and
The corresponding pilot channel of one pilot signal pilot channel corresponding with the second pilot signal approximate can be regarded as
It is identical pilot channel.
In embodiments of the present invention, using the orthogonality of FBMC, on information resources block can be obtained
Three symbol y3For：y3=h (x3+in3)；The 4th symbol y on 4th Resource Block4For：y4=h (n4+ix4),
Wherein, n3、n4It is real number, the interference that respectively data symbol on surrounding resources block brings.
Estimating to obtain the phase of pilot channel using step S202Afterwards, can be by the 3rd symbol and
Four symbols are obtained according to estimationRotated, according to postrotational 3rd symbol and the postrotational 4th
The amplitude of sign estimation pilot channel.
In an embodiment of the present invention, using the amplitude of equation below (7) estimating pilot frequency channel：
Wherein, hampIt is the amplitude of the pilot channel,It is postrotational 3rd symbol y3,It is postrotational 4th symbol y4。
It is understood that in actual applications, pilot tone letter can also be tried to achieve using other methods
The amplitude in road, is not limited in the acquiring method of the amplitude of offer in the above embodiment of the present invention.
Step S204, according to the phase and amplitude of the pilot channel, estimates the pilot channel.
In specific implementation, the amplitude h of pilot channel can be first extractedampReal part, afterwards further according to
hampEstimating pilot frequency channel；Can also be directly according to pilot channel come estimating pilot frequency channel.
In an embodiment of the present invention, estimating pilot channel by following formula (8) is：
In an alternative embodiment of the invention, estimating pilot channel by following formula (9) is：
Wherein：H is the pilot channel for estimating,It is hampReal part.
According to formula (8) or formula (9), you can estimate pilot channel.Comparatively speaking, according to formula (8)
The pilot channel for estimating is more nearly with the channel of reality, the pilot channel estimated according to formula (9) with
There is certain error in actual channel.
In existing auxiliary pilot method, Resource Block s2On symbol be a stochastic variable, transmitting terminal exists
Send Resource Block s2On auxiliary pilot when, it is necessary to be Resource Block s2The more transmission power of distribution, causes
For the transmission power of other data symbols distribution is smaller, then cause the data symbol that receiving terminal receives
Equivalent Signal to Interference plus Noise Ratio is relatively low.
And in embodiments of the present invention, when pilot channel estimation is carried out, by the real part of the first pilot signal
0 is disposed as with imaginary part.In the data transfer signal for receiving, the first symbol on first resource block is obtained
Number and Secondary resource block on the second symbol, based on the first symbol and the second sign estimation pilot channel
Phase, and the phase estimation pilot channel according to pilot channel amplitude, such that it is able to estimate pilot tone
Channel.As can be seen here, such scheme need not set special auxiliary pilot symbols to eliminate frequency pilot sign position
The interference from imaginary part is put, such that it is able to reduce the power of auxiliary pilot symbols, data symbol is improved
Equivalent Signal to Interference plus Noise Ratio.
Additionally, in existing auxiliary pilot method, due to there is special demand to auxiliary pilot symbols,
Therefore when auxiliary pilot symbols are configured, it is necessary to be modified to the pilot frequency configuration of LTE, and in the present invention
In stating the FBMC pilot-based channel estimation methods provided in embodiment, without carrying out spy to auxiliary pilot symbols
Different setting, therefore, it is possible to compatible with the pilot frequency configuration of existing LTE, without the pilot frequency configuration to LTE
It is modified.
Reference picture 3, the embodiment of the invention provides a kind of FBMC pilot channel estimations device 30, including：
Receiving unit 301, demodulating unit 302, phase estimation unit 303, amplitude Estimation unit 304 and lead
Frequency channel estimating unit 305, wherein：
Receiving unit 301, for receiving data transfer signal：
Demodulating unit 302, for demodulating the corresponding money of the first pilot signal from the data transfer signal
Symbol in source block, the Resource Block includes first resource block and Secondary resource block, the first resource block
To transmit the real part x of first pilot signal1Resource Block, and demodulate on the first resource block
Symbol is the first symbol；The Secondary resource block is the imaginary part x for transmitting first pilot signal2Resource
The symbol demodulated on block, and the Secondary resource block is the second symbol；The reality of first pilot signal
Portion x1With imaginary part x2It is 0；
Phase estimation unit 303, for according to first symbol and second symbol, estimating described
The phase of pilot channel；
Amplitude Estimation unit 304, for the phase according to the pilot channel estimated and obtain, estimates
The amplitude of the pilot channel；
Pilot channel estimation unit 305, for phase and amplitude according to the pilot channel, estimates
The pilot channel.
In specific implementation, the phase estimation unit 303, can be used for calculating first symbol and
The rotatable phase of second symbol so that according to postrotational first symbol of the rotatable phase in real axis
On projected length of the projected length with postrotational second symbol in the imaginary axis it is equal；By the rotation phase
Position negate, the inverted value for obtaining as the pilot channel phase.
In embodiments of the present invention, the rotatable phase can be：It is all to enable to postrotational first
The equal phase of projected length of projected length of the symbol on real axis with postrotational second symbol in the imaginary axis
In place value, the minimum phase value of projected length.
In embodiments of the present invention, the phase estimation unit 303, can be used for when first symbol
When imaginary part is more than or equal to 0 with the real part product of second symbol, led using described in equation below estimation
The phase of frequency channel：
When the imaginary part of first symbol is less than or equal to 0 with the real part product of second symbol, adopt
The phase of the pilot channel is estimated with equation below：
Wherein,It is the phase of the pilot channel, y1It is the first symbol, y2It is the second symbol,
To take y2Imaginary part function,To take y1Real part function,To take y2Real part
Function,To take y1Imaginary part function.
In specific implementation, the data transfer signal includes the second pilot signal, second pilot tone
The corresponding Resource Block of signal includes information resources block and the 4th Resource Block, and the information resources block is transmission
The real part x of second pilot signal3Resource Block, and the symbol demodulated on the information resources block is
3rd symbol；4th Resource Block is the imaginary part x for transmitting second pilot signal4Resource Block, and
The symbol demodulated on 4th Resource Block is the 4th symbol；The real part x of second pilot signal3With
Imaginary part x4It is not all 0.
In specific implementation, the amplitude Estimation unit 304 can be used for the 3rd symbol and institute
The 4th symbol is stated to be rotated according to the phase of the pilot channel；According to postrotational 3rd symbol and
Postrotational 4th symbol, estimates the amplitude of the pilot channel.
In embodiments of the present invention, the amplitude Estimation unit 304, can be used for estimating using equation below
The amplitude of the pilot channel：
Wherein, hampIt is the amplitude of the pilot channel, y3It is the 3rd symbol, y4It is the 4th symbol,It is postrotational 3rd symbol y3,It is postrotational 4th symbol y4。
In embodiments of the present invention, the pilot channel estimation unit 305, can be used for using equation below
Estimate the pilot channel：Wherein, hampIt is the amplitude of the pilot channel,For
The phase of the pilot channel, h is the pilot channel for estimating.
In embodiments of the present invention, the pilot channel estimation unit 305, can be used for using equation below
Estimate the pilot channel：Wherein：hampIt is the amplitude of the pilot channel,For
The phase of the pilot channel, h is the pilot channel for estimating,It is hampReal part.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment
Rapid to can be by program to instruct the hardware of correlation to complete, the program can be stored in a computer can
Read in storage medium, storage medium can include：ROM, RAM, disk or CD etc..
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art,
Without departing from the spirit and scope of the present invention, can make various changes or modifications, therefore guarantor of the invention
Shield scope should be defined by claim limited range.
Claims (18)
1. a kind of FBMC pilot-based channel estimation methods, it is characterised in that including：
Data transfer signal is received, and the corresponding money of the first pilot signal is demodulated from the data transfer signal
Symbol in source block, the Resource Block includes first resource block and Secondary resource block, the first resource block
To transmit the real part x of first pilot signal1Resource Block, and demodulate on the first resource block
Symbol is the first symbol；The Secondary resource block is the imaginary part x for transmitting first pilot signal2Resource
The symbol demodulated on block, and the Secondary resource block is the second symbol；The reality of first pilot signal
Portion x1With imaginary part x2It is 0；
According to first symbol and second symbol, the phase of the pilot channel is estimated；
According to the phase of the pilot channel estimated and obtain, the amplitude of the pilot channel is estimated；
According to the phase and amplitude of the pilot channel, the pilot channel is estimated.
2. FBMC pilot-based channel estimation methods as claimed in claim 1, it is characterised in that the estimation institute
The phase for stating pilot channel includes：
Calculate the rotatable phase of first symbol and second symbol so that revolve according to the rotatable phase
The projection of projected length of first symbol on real axis after turning with postrotational second symbol in the imaginary axis is long
Degree is equal；
The rotatable phase is negated, the inverted value for obtaining as the pilot channel phase.
3. FBMC pilot-based channel estimation methods as claimed in claim 2, it is characterised in that the rotation phase
Position is：It is all to enable to projected length of postrotational first symbol on real axis and postrotational second
In the equal phase value of projected length of the symbol in the imaginary axis, the minimum phase value of projected length.
4. FBMC pilot-based channel estimation methods as claimed in claim 3, it is characterised in that described according to institute
The first symbol and second symbol are stated, estimating the phase of the pilot channel includes：
When the imaginary part of first symbol is more than or equal to 0 with the real part product of second symbol, using such as
Lower formula estimates the phase of the pilot channel：
When the imaginary part of first symbol is less than or equal to 0 with the real part product of second symbol, using such as
Lower formula estimates the phase of the pilot channel：
Wherein,It is the phase of the pilot channel, y1It is the first symbol, y2It is the second symbol,To take
y2Imaginary part function,To take y1Real part function,To take y2Real part function,To take y1Imaginary part function.
5. FBMC pilot-based channel estimation methods as claimed in claim 1, it is characterised in that the data are passed
Defeated signal also includes：Second pilot signal, the corresponding Resource Block of second pilot signal includes the 3rd money
Source block and the 4th Resource Block, the information resources block are the real part x for transmitting second pilot signal3's
The symbol demodulated on Resource Block, and the information resources block is the 3rd symbol；4th Resource Block is
Transmit the imaginary part x of second pilot signal4Resource Block, and the symbol demodulated on the 4th Resource Block
Number be the 4th symbol；The real part x of second pilot signal3With imaginary part x4It is not all 0, and described second
The corresponding pilot channel of pilot signal pilot channel corresponding with first pilot signal is identical.
6. FBMC pilot-based channel estimation methods as claimed in claim 5, it is characterised in that the estimation institute
The amplitude for stating pilot channel includes：3rd symbol and the 4th symbol are believed according to the pilot tone
The phase in road is rotated；According to postrotational 3rd symbol and postrotational 4th symbol, institute is estimated
State the amplitude of pilot channel.
7. FBMC pilot-based channel estimation methods as claimed in claim 6, it is characterised in that the estimation institute
The amplitude of pilot channel is stated, is carried out using equation below：
Wherein, hampIt is the amplitude of the pilot channel, y3It is the 3rd symbol, y4It is the 4th symbol,
It is postrotational 3rd symbol y3,It is postrotational 4th symbol y4。
8. FBMC pilot-based channel estimation methods as claimed in claim 1, it is characterised in that described according to institute
The phase and amplitude of pilot channel are stated, the pilot channel is estimated, is carried out using equation below：
Wherein, hampIt is the amplitude of the pilot channel, h is the pilot channel for estimating,Led for described
The phase of frequency channel.
9. FBMC pilot-based channel estimation methods as claimed in claim 1, it is characterised in that described according to institute
The phase and amplitude of pilot channel are stated, the pilot channel is estimated, is carried out using equation below：
Wherein：hampIt is the amplitude of the pilot channel, h is the pilot channel for estimating,It is hamp's
Real part,It is the phase of the pilot channel.
10. a kind of FBMC pilot channel estimations device, it is characterised in that including：
Receiving unit, for receiving data transfer signal：
Demodulating unit, for demodulating the corresponding Resource Block of the first pilot signal from the data transfer signal
Symbol, the Resource Block include first resource block and Secondary resource block, the first resource block for transmission
The real part x of first pilot signal1Resource Block, and the symbol demodulated on the first resource block is
First symbol；The Secondary resource block is the imaginary part x for transmitting first pilot signal2Resource Block, and
The symbol demodulated on the Secondary resource block is the second symbol；The real part x of first pilot signal1With
Imaginary part x2It is 0；
Phase estimation unit, for according to first symbol and second symbol, estimating the pilot tone letter
The phase in road；
Amplitude Estimation unit, for the phase according to the pilot channel estimated and obtain, leads described in estimation
The amplitude of frequency channel；
Pilot channel estimation unit, for phase and amplitude according to the pilot channel, estimates described leading
Frequency channel.
11. FBMC pilot channel estimations devices as claimed in claim 10, it is characterised in that the phase
Estimation unit, the rotatable phase for calculating first symbol and second symbol so that according to
Projected length of postrotational first symbol of rotatable phase on real axis exists with postrotational second symbol
Projected length in the imaginary axis is equal；The rotatable phase is negated, the inverted value for obtaining is used as the pilot tone
The phase of channel.
12. FBMC pilot channel estimations devices as claimed in claim 11, it is characterised in that the rotation
Phase is：It is all to enable to projected length of postrotational first symbol on real axis with postrotational
In the equal phase value of projected length of two symbols in the imaginary axis, the minimum phase value of projected length.
13. FBMC pilot channel estimations devices as claimed in claim 12, it is characterised in that the phase
Estimation unit, is more than or waits for the imaginary part when first symbol with the real part product of second symbol
When 0, the phase of the pilot channel is estimated using equation below：
When the imaginary part of first symbol is less than or equal to 0 with the real part product of second symbol, using such as
Lower formula estimates the phase of the pilot channel：
Wherein,It is the phase of the pilot channel, y1It is the first symbol, y2It is the second symbol,To take
y2Imaginary part function,To take y1Real part function,To take y2Real part function,To take y1Imaginary part function.
14. FBMC pilot channel estimations devices as claimed in claim 10, it is characterised in that the data
Transmission signal also includes：Second pilot signal, the corresponding Resource Block of second pilot signal includes the 3rd
Resource Block and the 4th Resource Block, the information resources block are the real part x for transmitting second pilot signal3
Resource Block, and the symbol demodulated on the information resources block be the 3rd symbol；4th Resource Block
To transmit the imaginary part x of second pilot signal4Resource Block, and demodulate on the 4th Resource Block
Symbol is the 4th symbol；The real part x of second pilot signal3With imaginary part x4It is not all 0, and described
The corresponding pilot channel of two pilot signals pilot channel corresponding with first pilot signal is identical.
15. FBMC pilot channel estimations devices as claimed in claim 14, it is characterised in that the amplitude
Estimation unit, for by the 3rd symbol and the 4th symbol according to the pilot channel phase
Rotated；According to postrotational 3rd symbol and postrotational 4th symbol, the pilot tone letter is estimated
The amplitude in road.
16. FBMC pilot channel estimations devices as claimed in claim 15, it is characterised in that the amplitude
Estimation unit, the amplitude for estimating the pilot channel using equation below：
Wherein, hampIt is the amplitude of the pilot channel, y3It is the 3rd symbol, y4It is the 4th symbol,
It is postrotational 3rd symbol y3,It is postrotational 4th symbol y4。
17. FBMC pilot channel estimations devices as claimed in claim 10, it is characterised in that the pilot tone
Channel estimating unit, for estimating the pilot channel using equation below：
Wherein, hampIt is the amplitude of the pilot channel,It is the phase of the pilot channel, h is estimated
The pilot channel.
18. FBMC pilot channel estimations devices as claimed in claim 10, it is characterised in that the pilot tone
Channel estimating unit, for estimating the pilot channel using equation below：
Wherein：hampIt is the amplitude of the pilot channel,It is the phase of the pilot channel, h is estimated
The pilot channel,It is hampReal part.
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