CN106789762B - FBMC pilot-based channel estimation method and device - Google Patents
FBMC pilot-based channel estimation method and device Download PDFInfo
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- CN106789762B CN106789762B CN201610319285.4A CN201610319285A CN106789762B CN 106789762 B CN106789762 B CN 106789762B CN 201610319285 A CN201610319285 A CN 201610319285A CN 106789762 B CN106789762 B CN 106789762B
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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 method and device, the described method includes: receiving data transfer signal, and from the symbol demodulated in the data transfer signal on the corresponding resource block of the first pilot signal, the resource block includes first resource block and Secondary resource block, and 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 for estimating to obtain, the amplitude of the pilot channel is estimated；According to the phase and amplitude of the pilot channel, the pilot channel is estimated.Above 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 technique
Filter bank multi-carrier (Filtered Bank Multi-Carrier, FBMC) be the frequency spectrum based on subcarrier at
Type technology obtains filter group by a ptototype filter and its frequency displacement, to realize parallel multi-carrier transmission.It is inclined with FBMC
Transposition system combines, and can use its I/Q independence and expands transmission rate, so that spectrum efficiency is more than orthogonal frequency division multiplexing
(Orthogonal Frequency Division Multiplexing, OFDM).
FBMC removes the interference of time domain, frequency domain adjacent signals using real orthogonality, but when channel frequency domain response is plural number
When, real orthogonality is just unable to satisfy.To meet real orthogonality, in the prior art, using auxiliary pilot (Auxiliary Pilot,
Interference on the position of auxiliary pilot symbols from imaginary part is set to 0 by AP) method.
Existing auxiliary pilot method carries out in channel estimation, needs to distribute biggish power for auxiliary pilot symbols, lead
It causes to be that the power that data symbol distributes is smaller, the equivalent Signal to Interference plus Noise Ratio for the data symbol for then causing receiving end to receive is lower.
Summary 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 pilot symbols
Power, improve 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 method, comprising: receive
Data transfer signal, and from the symbol demodulated in the data transfer signal on the corresponding resource block of the first pilot signal, institute
Stating resource block includes first resource block and Secondary resource block, and the first resource block is the real part for transmitting first pilot signal
x1Resource block, and the symbol demodulated on the first resource block be the first symbol；The Secondary resource block is described in transmission
The imaginary part x of first pilot signal2Resource block, and the symbol demodulated on the Secondary resource block be the second symbol；Described
The real part x of one pilot signal1With imaginary part x2It is 0；According to first symbol and second symbol, the pilot tone is estimated
The phase of channel；According to the phase of the pilot channel for estimating to obtain, the amplitude of the pilot channel is estimated；According to institute
The phase and amplitude for stating pilot channel, estimate the pilot channel.
Optionally, the phase of the estimation pilot channel includes: to calculate first symbol and second symbol
Number rotatable phase so that according to projected length of postrotational first symbol of the rotatable phase on real axis with it is postrotational
Projected length of second symbol in the imaginary axis is equal；The rotatable phase is negated, obtained inverted value is believed as the pilot tone
The phase in road.
Optionally, the rotatable phase are as follows: all projected lengths for enabling to postrotational first symbol on real axis
In the phase value equal with projected length of postrotational second symbol in the imaginary axis, the smallest phase value of projected length.
Optionally, described according to first symbol and second symbol, estimate the phase packet of the pilot channel
It includes:: when the imaginary part of first symbol and the real part product of second symbol are greater than or equal to 0, estimated using following formula
Count the phase of the pilot channel:Imaginary part and second symbol when first symbol
Number real part product be less than or equal to 0 when, the phase of the pilot channel is estimated using following formula:Wherein,For the phase of the pilot channel, y1For the first symbol, y2For 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 further include: the second pilot signal, the corresponding resource of second pilot signal
Block includes information resources block and the 4th resource block, and the information resources block is the real part x for transmitting second pilot signal3's
Resource block, and the symbol demodulated on the information resources block is third symbol；4th resource block is transmission described second
The imaginary part x of pilot signal4Resource block, and the symbol demodulated on the 4th resource block be the 4th symbol；Described second leads
The real part x of frequency signal3With imaginary part x4It is not all 0, and the corresponding pilot channel of second pilot signal and first pilot tone are believed
Number corresponding pilot channel is identical.
Optionally, the amplitude of the estimation pilot channel includes: by the third symbol and the 4th symbol
It is rotated according to the phase of the pilot channel；According to postrotational third symbol and postrotational 4th symbol, estimation
The amplitude of the pilot channel.
Optionally, the amplitude of the estimation pilot channel, is carried out using following formula:Wherein, hampFor the amplitude of the pilot channel, y3For third
Symbol, y4For the 4th symbol,For postrotational third symbol y3,For postrotational 4th symbol
Number y4。
Optionally, the phase and amplitude according to the pilot channel, estimates the pilot channel, using as follows
Formula carries out:Wherein, hampFor the amplitude of the pilot channel, h is the pilot tone letter estimated
Road,For the phase of the pilot channel.
Optionally, the phase and amplitude according to the pilot channel, estimates the pilot channel, using as follows
Formula carries out:Wherein: hampFor the amplitude of the pilot channel, h is the pilot tone letter estimated
Road,For hampReal part,For the phase of the pilot channel.
To solve the above problems, the embodiment of the invention also provides a kind of FBMC pilot channel estimation devices, comprising: receive
Unit transmits signal for receiving data: demodulating unit, for demodulating the first pilot signal from the data transfer signal
Symbol on corresponding resource block, the resource block include first resource block and Secondary resource block, and the first resource block is to pass
The real part x of defeated first pilot signal1Resource block, and the symbol demodulated on the first resource block be the first symbol；
The Secondary resource block is the imaginary part x for transmitting first pilot signal2Resource block, and demodulated on the Secondary resource block
Symbol be the second symbol；The real part x of first pilot signal1With imaginary part x2It is 0；Phase estimation unit, for according to institute
The first symbol and second symbol are stated, estimates the phase of the pilot channel；Amplitude Estimation unit, for estimating according to
The phase for counting the obtained pilot channel, estimates the amplitude of the pilot channel；Pilot channel estimation unit, for according to institute
The phase and amplitude for stating pilot channel, estimate the pilot channel.
Optionally, the phase estimation unit, for calculating the rotation phase of first symbol and second symbol
Position, so that existing according to projected length of postrotational first symbol of the rotatable phase on real axis and postrotational second symbol
Projected length in the imaginary axis is equal；The rotatable phase is negated, phase of the obtained inverted value as the pilot channel.
Optionally, the rotatable phase are as follows: all projected lengths for enabling to postrotational first symbol on real axis
In the phase value equal with projected length of postrotational second symbol in the imaginary axis, the smallest phase value of projected length.
Optionally, the phase estimation unit, for when the imaginary part of first symbol and the real part of second symbol
When product is greater than or equal to 0, the phase of the pilot channel is estimated using following formula:
When the imaginary part of first symbol and the real part product of second symbol are less than or equal to 0, institute is estimated using following formula
State the phase of pilot channel:Wherein,For the phase of the pilot channel, y1It is first
Symbol, y2For the second symbol,To take y2Imaginary part function,To take y1Real part function,For
Take y2Real part function,To take y1Imaginary part function.
Optionally, the data transfer signal further include: the second pilot signal, the corresponding resource of second pilot signal
Block includes information resources block and the 4th resource block, and the information resources block is the real part x for transmitting second pilot signal3's
Resource block, and the symbol demodulated on the information resources block is third symbol；4th resource block is transmission described second
The imaginary part x of pilot signal4Resource block, and the symbol demodulated on the 4th resource block be the 4th symbol；Described second leads
The real part x of frequency signal3With imaginary part x4It is not all 0, and the corresponding pilot channel of second pilot signal and first pilot tone are believed
Number corresponding pilot channel is identical.
Optionally, the amplitude Estimation unit, for leading the third symbol and the 4th symbol according to described
The phase of frequency channel is rotated；According to postrotational third symbol and postrotational 4th symbol, the pilot tone letter is estimated
The amplitude in road.
Optionally, the amplitude Estimation unit, for estimating the amplitude of the pilot channel using following formula:Wherein, hampFor the amplitude of the pilot channel, y3For third symbol
Number, y4For the 4th symbol,For postrotational third symbol y3,For postrotational 4th symbol
y4。
Optionally, the pilot channel estimation unit, for estimating the pilot channel using following formula:Wherein, hampFor the amplitude of the pilot channel,For the inverted value of the phase of the pilot channel, h
For the pilot channel estimated.
Optionally, the pilot channel estimation unit, for estimating the pilot channel using following formula:Wherein: hampFor the amplitude of the pilot channel,For the inverted value of the phase of the pilot channel, h
For the pilot channel estimated,For hampReal part.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
When carrying out pilot channel estimation, the real and imaginary parts of the first pilot signal are disposed as 0.In the number received
According in transmission signal, the second symbol on the first symbol and Secondary resource block on first resource block is obtained, based on the first symbol
Number and the second sign estimation pilot channel phase, and the amplitude of the phase estimation pilot channel according to pilot channel, thus
It is estimated that pilot channel.From the foregoing, it will be observed that above scheme is without setting special auxiliary pilot symbols to eliminate frequency pilot sign
From the interference of imaginary part on position, so as to reduce the power of auxiliary pilot symbols, the equivalent letter for improving data symbol dry is made an uproar
Than.In addition, above scheme is compatible with the pilot frequency configuration of LTE, it is modified without the pilot frequency configuration to LTE.
Further, when calculating rotatable phase, from all projections for enabling to postrotational first symbol on real axis
In the length phase value equal with projected length of postrotational second symbol in the imaginary axis, the smallest phase of projected length is chosen
Value is used as rotatable phase, and the precision of phase estimation can be improved.
Detailed description of the invention
Fig. 1 is a kind of symbol distribution map of existing data transfer signal；
Fig. 2 is the flow chart of one of embodiment of the present invention FBMC pilot-based channel estimation method；
Fig. 3 is the structural schematic diagram of one of embodiment of the present invention FBMC pilot channel estimation device.
Specific embodiment
FBMC removes the interference of time domain, frequency domain adjacent signals using real orthogonality, but when channel frequency domain response is plural number
When, real orthogonality is just unable to satisfy.To meet real orthogonality, in the prior art, using auxiliary pilot (Auxiliary Pilot,
Interference on the position of auxiliary pilot symbols from imaginary part is set to 0 by AP) method.
Referring to Fig.1, symbol x is sent on the corresponding resource block of the real part of pilot tone (the black square region in Fig. 1)0, warp
It crosses after FBMC modulation and demodulation, the symbol on the corresponding resource block of the real part of pilot tone becomes y0, in the ideal case,Wherein,For the corresponding resource block of data symbol sent around pilot tone；For fixation
Coefficient, corresponding FBMC is sent plus shock response of the receiving filter in two domain of time-frequency, k=1, and 2 ... ..., 44.
In existing auxiliary pilot method, in resource block s2Upper transmission auxiliary pilot, remaining skUpper transmission data symbol.
To guarantee y0In imaginary part be 0, be calculatedSo that y0In only include x0。
However, in existing auxiliary pilot method, resource block s2On symbol be a stochastic variable, transmitting terminal is being sent
Resource block s2On auxiliary pilot when, need for resource block s2More transmission power is distributed, is caused for the distribution of other data symbols
Transmission power it is smaller, the equivalent Signal to Interference plus Noise Ratio for the data symbol for then causing receiving end to receive is lower.
In embodiments of the present invention, when carrying out pilot channel estimation, the real and imaginary parts of the first pilot signal are all provided with
It is set to 0.In the data transfer signal received, the on the first symbol and Secondary resource block on first resource block is obtained
Two symbols, the phase based on the first symbol and the second sign estimation pilot channel, and led according to the phase estimation of pilot channel
The amplitude of frequency channel, so as to estimate pilot channel.From the foregoing, it will be observed that above scheme is not necessarily to set special auxiliary pilot symbol
It number eliminates the interference on pilot frequency symbol position from imaginary part, so as to reduce the power of auxiliary pilot symbols, improves data
The equivalent Signal to Interference plus Noise Ratio of symbol.In addition, above scheme is compatible with the pilot frequency configuration of LTE, carried out more without the pilot frequency configuration to LTE
Change.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to the accompanying drawing to this
The specific embodiment of invention is described in detail.
The embodiment of the invention provides a kind of FBMC pilot-based channel estimation method, referring to Fig. 2, below by way of specific steps into
Row is described in detail.
Step S201 receives data transfer signal, and demodulates the first pilot signal pair from the data transfer signal
The symbol on resource block answered.
In specific implementation, transmitting terminal can be according to existing communication protocol, in some pre-set fixation
The first pilot signal is sent on subcarrier, the first pilot signal may include real part x1With imaginary part x2.Transmitting terminal can be by data symbols
Number data transfer signal is generated together with the first pilot signal, data transfer signal is after FBMC is modulated, by wireless channel
It is sent to receiving end.
Receiving end carries out demodulation process after the data transfer signal for receiving transmitting terminal transmission, to data transfer signal,
It can be from the symbol demodulated in data transfer signal on the corresponding resource block of the first pilot signal.Due to the first pilot signal packet
Include real part x1With imaginary part x2, therefore the corresponding resource block of the first pilot signal may include first resource block and Secondary resource block,
Wherein: first resource block is the real part x for transmitting the first pilot signal1Resource block, the symbol demodulated on first resource block is
First symbol；Secondary resource block is the imaginary part x for transmitting the first pilot signal2Resource block, the symbol demodulated on Secondary resource block
Number be the second symbol.
In embodiments of the present invention, the real part x of the first pilot signal1With imaginary part x2It can be set to 0.Utilize FBMC's
Orthogonality, the first symbol y on available first resource block1And the second symbol y on Secondary resource block2, specifically:
Wherein, n1、n2For real number, the data symbol bring respectively on surrounding resources block is interfered；H is that the present invention is implemented
The pilot channel to be estimated in example.
Step S202 estimates the phase of the pilot channel according to first symbol and second symbol.
In embodiments of the present invention, in the phase of estimating pilot frequency channel, the first symbol y can first be calculated1And second
Symbol y2Rotatable phaseSo that according to rotatable phaseProjected length and rotation of postrotational first symbol on real axis
Projected length of second symbol in the imaginary axis after turning is equal.Rotatable phase is being calculatedAfterwards, rotatable phase is negated,
Obtained inverted value 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, the rotation that is calculated
Phase inversion positionFollowing relationship should be met:
Wherein,To takeThe function of real part,To takeThe function of imaginary part.
Due to including two equations and a unknown number in formula (2), the equation in formula (2) is excessively fixed, in ideal situation
Under the rotatable phase that is solved by two equationsIt is equal.But in practical applications, exist in data transmission procedure
The interference of noise, correspondingly, the first symbol y being disturbed1And the second symbol y2Expression formula are as follows:
Wherein, ν1And ν2For multiple noise.
At this point, what two equations in formula (2) solvedValue may be unequal.In embodiments of the present invention, for formula
(3), following goal expression can be provided:
The meaning of formula (4) are as follows: take all projected lengths and rotation for enabling to postrotational first symbol on real axis
In the equal phase value of projected length of second symbol in the imaginary axis afterwards, the smallest phase value of projected length.Namely it may deposit
Enable to projected length of postrotational first symbol on real axis and postrotational second symbol in the imaginary axis multiple
The equal phase value of projected length, but the smallest phase value of projected length is therefrom only chosen as rotatable phase.
According to formula (4), in an embodiment of the present invention, when the imaginary part of the first symbolWith the real part of the second symbolProduct be greater than or equal to 0 when, using the phase of following formula (5) estimating pilot frequency channel
When the imaginary part of the first symbolWith the real part of the second symbolProduct be less than or equal to 0 when, use
The phase of following formula (6) estimating pilot frequency channel
In the phase for obtaining pilot channelAfterwards, step S203 is executed.
It can be seen that when calculating rotatable phase, from all throwings for enabling to postrotational first symbol on real axis
In the shadow length phase value equal with projected length of postrotational second symbol in the imaginary axis, the smallest phase of projected length is chosen
The precision of phase estimation can be improved as rotatable phase in place value.
It is understood that in practical applications, can also adopt with other methods, to acquire rotatable phaseNot
The rotatable phase acquiring method provided in the above embodiment of the present invention is provided.
Step S203 estimates the amplitude of the pilot channel according to the phase of the pilot channel for estimating to obtain.
In specific implementation, can according to the imaginary part of the real part of postrotational first symbol and postrotational second symbol,
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 further according to
The amplitude of one pilot signal estimating pilot frequency channel.Therefore, it is also desirable to adopt the amplitude for carrying out estimating pilot frequency channel with other methods.
In embodiments of the present invention, the second pilot signal, and the second pilot signal can be set in data transfer signal
Occupied resource block and the occupied resource block of the first pilot signal be not identical.Namely in data transfer signal, including
Two pilot signals: the first pilot signal and the second pilot signal.
Second pilot signal equally includes real and imaginary parts, and the occupied resource block of the second pilot signal includes information resources
Block and the 4th resource block, in which: information resources block is the real part x for transmitting the second pilot signal3Resource block, and information resources
The symbol demodulated on block is third symbol；4th resource block is the imaginary part x for transmitting the second pilot signal4Resource block, and
The symbol demodulated on four resource blocks is the 4th symbol.It should be noted that the real part x of the second pilot signal3With imaginary part x4It cannot
All 0, and the corresponding pilot channel of the second pilot signal pilot channel corresponding with the first pilot signal is identical.
In practical applications, the identical channel gain that can refer to two pilot channels of pilot channel is equal or extremely connects
Closely.For example, it is same for carrying the subcarrier of the first pilot signal and the subcarrier of the second pilot signal of carrying on frequency domain
Adjacent sub-carrier in FBMC symbol, in this way, two corresponding pilot channels of subcarrier can approximately regard identical as
Pilot channel.For another example, the first pilot signal and the position of the second pilot signal in the time domain are respectively in adjacent FBMC symbol
Identical sub-carrier positions, then the corresponding pilot channel of the first pilot signal pilot channel corresponding with the second pilot signal can be with
Approximately regard identical pilot channel as.
In embodiments of the present invention, the third symbol y using the orthogonality of FBMC, on available information resources block3Are as follows:
y3=h (x3+in3)；The 4th symbol y on 4th resource block4Are as follows: y4=h (n4+ix4), wherein n3、n4It is respectively all for real number
Data symbol bring interference on the resource block of side.
Estimate to obtain the phase of pilot channel using step S202Afterwards, third symbol and the 4th symbol can be pressed
It obtains by estimateIt is rotated, according to postrotational third symbol and postrotational 4th sign estimation pilot channel
Amplitude.
In an embodiment of the present invention, using the amplitude of following formula (7) estimating pilot frequency channel:
Wherein, hampFor the amplitude of the pilot channel,For postrotational third symbol y3,For postrotational 4th symbol y4。
It is understood that in practical applications, can also adopt with other methods, to acquire the amplitude of pilot channel,
The acquiring method of amplitude provided in the above embodiment of the present invention is provided.
Step S204 estimates the pilot channel according to the phase and amplitude of the pilot channel.
In specific implementation, the amplitude h of pilot channel can first be extractedampReal part, later further according to hampEstimation is led
Frequency channel；It can also be directly according to pilot channel come estimating pilot frequency channel.
In an embodiment of the present invention, pilot channel is estimated by following formula (8) are as follows:
In an alternative embodiment of the invention, pilot channel is estimated by following formula (9) are as follows:
Wherein: h is the pilot channel estimated,For hampReal part.
According to formula (8) or formula (9), pilot channel can be estimated.In comparison, believed according to the pilot tone that formula (8) estimates
Road is more nearly with actual channel, and according to the pilot channel that formula (9) estimates, there is a certain error with actual channel.
In existing auxiliary pilot method, resource block s2On symbol be a stochastic variable, transmitting terminal is sending resource
Block s2On auxiliary pilot when, need for resource block s2More transmission power is distributed, the hair distributed for other data symbols is caused
The equivalent Signal to Interference plus Noise Ratio for penetrating the data symbol that power is smaller, and receiving end is then caused to receive is lower.
And in embodiments of the present invention, it is when carrying out pilot channel estimation, the real and imaginary parts of the first pilot signal are equal
It is set as 0.In the data transfer signal received, 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 according to the phase estimation of pilot channel
The amplitude of pilot channel, so as to estimate pilot channel.It can be seen that above scheme is without setting special auxiliary pilot
Symbol eliminates the interference on pilot frequency symbol position from imaginary part, so as to reduce the power of auxiliary pilot symbols, improves number
According to the equivalent Signal to Interference plus Noise Ratio of symbol.
In addition, since to auxiliary pilot symbols, there are special demands, being configured in existing auxiliary pilot method
When auxiliary pilot symbols, the FBMC pilot tone that the pilot frequency configuration of LTE is modified, and is provided in the above embodiment of the present invention is needed
In channel estimation methods, it is not necessary that auxiliary pilot symbols are carried out with special setting, therefore can be with the pilot frequency configuration of existing LTE
It is compatible, it is modified without the pilot frequency configuration to LTE.
Referring to Fig. 3, the embodiment of the invention provides a kind of FBMC pilot channel estimation devices 30, comprising: receiving unit
301, demodulating unit 302, phase estimation unit 303, amplitude Estimation unit 304 and pilot channel estimation unit 305, in which:
Receiving unit 301, transmits signal for receiving data:
Demodulating unit 302, for demodulating the corresponding resource block of the first pilot signal from the data transfer signal
Symbol, the resource block includes first resource block and Secondary resource block, and the first resource block is to transmit first pilot tone
The real part x of signal1Resource block, and the symbol demodulated on the first resource block be the first symbol；The Secondary resource block
For the imaginary part x for transmitting first pilot signal2Resource block, and the symbol demodulated on the Secondary resource block be second symbol
Number；The real part x of first pilot signal1With imaginary part x2It is 0；
Phase estimation unit 303, for estimating the pilot channel according to first symbol and second symbol
Phase；
Amplitude Estimation unit 304 estimates the pilot tone for the phase according to the pilot channel for estimating to obtain
The amplitude of channel；
Pilot channel estimation unit 305 estimates the pilot tone for the phase and amplitude according to the pilot channel
Channel.
In specific implementation, the phase estimation unit 303 can be used for calculating first symbol and described second
The rotatable phase of symbol, so that after according to projected length and rotation of postrotational first symbol of the rotatable phase on real axis
Projected length of second symbol in the imaginary axis it is equal；The rotatable phase is negated, obtained inverted value is as the pilot tone
The phase of channel.
In embodiments of the present invention, the rotatable phase can be with are as follows: all to enable to postrotational first symbol in reality
In projected length on the axis phase value equal with projected length of postrotational second symbol in the imaginary axis, projected length is minimum
Phase value.
In embodiments of the present invention, the phase estimation unit 303 can be used for imaginary part and institute when first symbol
When stating the real part product of the second symbol more than or equal to 0, the phase of the pilot channel is estimated using following formula:
When the imaginary part of first symbol and the real part product of second symbol are less than or equal to 0, using following public affairs
Formula estimates the phase of the pilot channel:
Wherein,For the phase of the pilot channel, y1For the first symbol, y2For the second symbol,To take y2Void
The function in portion,To take y1Real part function,To take y2Real part function,To take y1Imaginary part
Function.
It in specific implementation, include the second pilot signal in the data transfer signal, second pilot signal is corresponding
Resource block include information resources block and the 4th resource block, the information resources block is the reality for transmitting second pilot signal
Portion x3Resource block, and the symbol demodulated on the information resources block be third symbol；4th resource block is transmission institute
State the imaginary part x of the second pilot signal4Resource block, and the symbol demodulated on the 4th resource block be the 4th symbol；It is described
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 third symbol and the 4th symbol
It number is rotated according to the phase of the pilot channel；According to postrotational third symbol and postrotational 4th symbol, estimate
Count the amplitude of the pilot channel.
In embodiments of the present invention, the amplitude Estimation unit 304 can be used for estimating the pilot tone using following formula
The amplitude of channel:
Wherein, hampFor the amplitude of the pilot channel, y3For third symbol, y4For the 4th symbol,For
Postrotational third symbol y3,For postrotational 4th symbol y4。
In embodiments of the present invention, the pilot channel estimation unit 305 can be used for using described in the estimation of following formula
Pilot channel:Wherein, hampFor the amplitude of the pilot channel,For the phase of the pilot channel,
H is the pilot channel estimated.
In embodiments of the present invention, the pilot channel estimation unit 305 can be used for using described in the estimation of following formula
Pilot channel:Wherein: hampFor the amplitude of the pilot channel,For the phase of the pilot channel,
H is the pilot channel estimated,For hampReal part.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: ROM, RAM, disk or CD etc..
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (10)
1. a kind of filter bank multi-carrier FBMC pilot-based channel estimation method characterized by comprising
Data transfer signal is received, and from being demodulated on the corresponding resource block of the first pilot signal in the data transfer signal
Symbol, the resource block include first resource block and Secondary resource block, and the first resource block is to transmit the first pilot tone letter
Number real part x1Resource block, and the symbol demodulated on the first resource block be the first symbol；The Secondary resource block is
Transmit the imaginary part x of first pilot signal2Resource block, and the symbol demodulated on the Secondary resource block be second symbol
Number；The real part x of first pilot signal1With imaginary part x2It is 0；The data transfer signal further include: the second pilot signal,
The corresponding resource block of second pilot 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 be third symbol；Institute
Stating the 4th resource block is the imaginary part x for transmitting 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 second pilot signal is corresponding
Pilot channel pilot channel corresponding with first pilot signal it is identical；
According to first symbol and second symbol, the phase of the pilot channel is estimated, comprising: when first symbol
Number imaginary part and second symbol real part product be greater than or equal to 0 when, the pilot channel is estimated using following formula
Phase:When the imaginary part of first symbol and the real part product of second symbol are less than
Or when being equal to 0, the phase of the pilot channel is estimated using following formula:Wherein,
For the phase of the pilot channel, y1For the first symbol, y2For the second symbol,To take y2Imaginary part function,
To take y1Real part function,To take y2Real part function,To take y1Imaginary part function；
According to the phase of the pilot channel for estimating to obtain, the amplitude of the pilot channel is estimated, comprising: by described the
Three symbols and the 4th symbol are rotated according to the phase of the pilot channel；According to postrotational third symbol and
Postrotational 4th symbol, the amplitude of the pilot channel is calculated using following formula:Wherein, hampFor the amplitude of the pilot channel, y3For third symbol
Number, y4For the 4th symbol,For postrotational third symbol y3,For postrotational 4th symbol
y4；
According to the phase and amplitude of the pilot channel, the pilot channel is estimated.
2. FBMC pilot-based channel estimation method as described in claim 1, which is characterized in that the estimation pilot channel
Phase includes:
The rotatable phase of first symbol and second symbol is calculated, so that according to the rotatable phase postrotational
Projected length of one symbol on real axis is equal with projected length of postrotational second symbol in the imaginary axis；
The rotatable phase is negated, phase of the obtained inverted value as the pilot channel.
3. FBMC pilot-based channel estimation method as claimed in claim 2, which is characterized in that the rotatable phase are as follows: Suo Youneng
Enough so that projected length of postrotational first symbol on real axis and projected length of postrotational second symbol in the imaginary axis
In equal phase value, the smallest phase value of projected length.
4. FBMC pilot-based channel estimation method as described in claim 1, which is characterized in that described according to the pilot channel
Phase and amplitude estimate the pilot channel, are carried out using following formula:
Wherein, hampFor the amplitude of the pilot channel, h is the pilot channel estimated,For the phase of the pilot channel
Position.
5. FBMC pilot-based channel estimation method as described in claim 1, which is characterized in that described according to the pilot channel
Phase and amplitude estimate the pilot channel, are carried out using following formula:
Wherein: hampFor the amplitude of the pilot channel, h is the pilot channel estimated,For hampReal part,For
The phase of the pilot channel.
6. a kind of filter bank multi-carrier FBMC pilot channel estimation device characterized by comprising
Receiving unit transmits signal for receiving data:
Demodulating unit, for from the symbol demodulated in the data transfer signal on the corresponding resource block of the first pilot signal,
The resource block includes first resource block and Secondary resource block, and the first resource block is the reality for transmitting first pilot signal
Portion x1Resource block, and the symbol demodulated on the first resource block be the first symbol；The Secondary resource block is transmission institute
State the imaginary part x of the first pilot signal2Resource block, and the symbol demodulated on the Secondary resource block be the second symbol；It is described
The real part x of first pilot signal1With imaginary part x2It is 0；And the second pilot signal is demodulated from the data transfer signal,
The corresponding resource block of second pilot 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 be third symbol；Institute
Stating the 4th resource block is the imaginary part x for transmitting 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 second pilot signal is corresponding
Pilot channel pilot channel corresponding with first pilot signal it is identical；
Phase estimation unit, for estimating the phase of the pilot channel according to first symbol and second symbol,
It include: to be estimated when the real part product of the imaginary part of first symbol and second symbol is greater than or equal to 0 using following formula
Count the phase of the pilot channel:Imaginary part and second symbol when first symbol
Number real part product be less than or equal to 0 when, the phase of the pilot channel is estimated using following formula:Wherein,For the phase of the pilot channel, y1For the first symbol, y2For the second symbol,To take y2Imaginary part function,To take y1Real part function,To take y2Real part function,To take y1Imaginary part function；
Amplitude Estimation unit estimates the pilot channel for the phase according to the pilot channel for estimating to obtain
Amplitude, comprising: rotate the third symbol and the 4th symbol according to the phase of the pilot channel；According to rotation
Third symbol and postrotational 4th symbol after turning, the amplitude of the pilot channel is calculated using following formula:Wherein, hampFor the amplitude of the pilot channel, y3For third symbol
Number, y4For the 4th symbol,For postrotational third symbol y3,For postrotational 4th symbol
y4；
Pilot channel estimation unit estimates the pilot channel for the phase and amplitude according to the pilot channel.
7. FBMC pilot channel estimation device as claimed in claim 6, which is characterized in that the phase estimation unit is used for
The rotatable phase of first symbol and second symbol is calculated, so that according to postrotational first symbol of the rotatable phase
Projected length number on real axis is equal with projected length of postrotational second symbol in the imaginary axis；The rotatable phase is taken
Instead, phase of the inverted value obtained as the pilot channel.
8. FBMC pilot channel estimation device as claimed in claim 7, which is characterized in that the rotatable phase are as follows: Suo Youneng
Enough so that projected length of postrotational first symbol on real axis and projected length of postrotational second symbol in the imaginary axis
In equal phase value, the smallest phase value of projected length.
9. FBMC pilot channel estimation device as claimed in claim 6, which is characterized in that the pilot channel estimation unit,
For estimating the pilot channel using following formula:
Wherein, hampFor the amplitude of the pilot channel,For the phase of the pilot channel, h is the pilot tone letter estimated
Road.
10. FBMC pilot channel estimation device as claimed in claim 6, which is characterized in that the pilot channel estimation unit,
For estimating the pilot channel using following formula:
Wherein: hampFor the amplitude of the pilot channel,For the phase of the pilot channel, h is the pilot tone letter estimated
Road,For hampReal part.
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| CN103888406A (en) * | 2014-03-28 | 2014-06-25 | 华中科技大学 | Data transmission method for filter bank multi-carrier system |
| WO2015196408A1 (en) * | 2014-06-26 | 2015-12-30 | 华为技术有限公司 | Fbmc-based pilot sending method, channel estimating method and related devices |
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