CN103181094B - Radio base station and the method for wherein expanding for estimating Doppler - Google Patents
Radio base station and the method for wherein expanding for estimating Doppler Download PDFInfo
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- CN103181094B CN103181094B CN201080069929.XA CN201080069929A CN103181094B CN 103181094 B CN103181094 B CN 103181094B CN 201080069929 A CN201080069929 A CN 201080069929A CN 103181094 B CN103181094 B CN 103181094B
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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
- H04L25/0222—Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/10—Polarisation diversity; Directional diversity
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Abstract
Embodiment herein relates to the method for the doppler spread of the signal being transmitted by the channel of radio circuit by subscriber equipment (10) for estimation in radio base station (12). Radio base station 12 and subscriber equipment 10 are included in radio circuit. Radio base station (12) receives first signal and secondary signal, wherein first signal and the secondary signal signal based on being transmitted by subscriber equipment (10) from subscriber equipment (10). The first and second signals are separating aspect space, time and/or polarization. Radio base station (12) is by received first signal and known signal being compared to estimate the first channel estimating of received first signal, and by received secondary signal and known signal being compared to estimate the second channel of received secondary signal estimates. Radio base station (12) is determined the ratio that the first channel estimating and second channel are estimated, and estimate the auto-correlation function of function of definite ratio. Radio base station (12) then carrys out estimating Doppler expansion based on estimated auto-correlation function.
Description
Technical field
Embodiment herein relates to radio base station and method wherein. Specifically, embodiment herein relates to the estimation of the doppler spread in radio circuit.
Background technology
In current radio circuit, subscriber equipment by radio link in so-called up-link (UL) transmission to radio base station transmission of information, and radio base station along other direction in so-called downlink (DL) transmission to subscriber equipment transmission of information. Doppler frequency shift is the frequency displacement of the radio signal that run into by receiver in the time that conveyer and receiver move each other. Doppler spread be from conveyer to receiver multiple enter the expansion of Doppler frequency shift of office signaling ray. Doppler spread causes the variation of the propagation channel between conveyer and receiver. The knowledge of doppler spread obtains many application in GSM. The application of this class comprises: receiver algorithm, for example, for the smoothing filter of channel estimating; And radio resource management algorithms, for example selection of link circuit self-adapting, scheduling and closed loop or Open-Loop Spatial Multiplexing. The doppler spread of radio link and channel are inversely proportional to coherence time. Channel coherence time is to think that channel impulse response is the relevant duration, that is, the one other channel impulse response of carrying out during channel impulse response and channel coherence time is relevant. Long channel allows receiver, for example radio base station to follow for dispatching and the effect of the multipath fading of link circuit self-adapting coherence time, for example, for using the Closed-Loop Spatial Multiplexing in time correlation scheduling and the downlink of the GSM such as evolved universal terrestrial radio access (E-UTRA) system. For period from from subscriber equipment to radio base station transfer channel quality information report should be shorter coherence time than channel, be downlink channel status information accurately to provide during the report period. Similarly, the periodicity of the institute's transfer channel detection reference signal in up-link should be shorter coherence time than channel, to realize the efficient uplink channel quality estimation between sounding reference signal transmission enhancement.
Doppler spread can be estimated with doppler spread estimator according to many modes. The time character of the channel estimating of one class doppler spread estimator based on reception signal. In time domain, propagation channel can be modeled as the tapped delay line with time correlation channel tap. Suppose that channel tap C is rayleigh fading channel tap, doppler spread can be estimated from the measured level crossing rate of channel tap C. Some estimators rely on the auto-correlation function R of channel tap Cc：
Wherein
E is expected value operator,
c*Represent complex conjugate,
T is the time, and
τ postpones.
In theory, another auto-correlation function R of rayleigh fading channel tapcBe expressed as
Wherein
C is constant,
J0First kind zero Bessel function, and
fDIt is doppler spread.
From the estimation of auto-correlation function and the form known of auto-correlation function, doppler spread can be for example fromTimeSecond dervativeWithRatio:
Or estimate from maximal possibility estimation,
WhereinRepresent doppler spread estimation.
Doppler spread is estimatedAlso can obtain from the auto-covariance function of the function of channel tap. The example of this function of channel tap is the squared magnitude of channel tap.
The channel estimating of certain time instance obtains from the transmission of pilot tone or reference signal conventionally. If there is the continuous or periodic transfer in fixed frequency, channel estimator is through simplifying and being more effective. The periodicity of transmission is shorter, can estimate more much higherly generally to strangle expansion or shorter channel coherence time, thereby cause the better resolution ratio of estimation.
Accurately channel estimating require the signal that transmits be known at receiver. In general, transmit with reference to or pilot signal be known, except being constant amplitude and phase place between single transmission period. In some GSMs, for example E-UTRA, travelling carriage can change the delivering power between subsequent transmission. This change changes amplitude and may also change the phase place of transmitted signal. Radio base station is estimated the composite channel being made up of conveyer gain (being amplitude and phase place) and propagation channel. Composite channel is correlated with for the compensation in receiver, but uncorrelated for the propagation of estimating transmission. The auto-correlation function of composite channel and At All Other Times character can be from the auto-correlation functions of propagation channel and character is very different At All Other Times, and therefore the doppler spread based on channel estimating estimates it may is wrong. In general, doppler spread estimator comprise with reception antenna on the time character of time correlation of reception signal, thereby cause and cause the wrong doppler spread of inefficient transmission plan to be estimated.
Summary of the invention
An object of embodiment is herein to provide the mechanism of carrying out estimating Doppler and expand the better performance that causes radio circuit with reliable fashion.
According to an aspect of embodiment herein, this object realizes by the method for the doppler spread of estimating the signal being transmitted by the channel of radio circuit by subscriber equipment in radio base station. Radio base station and subscriber equipment are included in radio circuit. Radio base station receives first signal and secondary signal, wherein first signal and the secondary signal signal based on being transmitted by subscriber equipment from subscriber equipment. In addition, the first and second signals are separating aspect space, time and/or polarization.
Radio base station is by received first signal and known signal being compared to estimate the first channel estimating of received first signal, and by received secondary signal and known signal being compared to estimate the second channel of received secondary signal estimates. In addition, radio base station is determined the ratio that the first channel estimating and second channel are estimated, and estimate the auto-correlation function of function of definite ratio. Then radio base station carrys out estimating Doppler expansion based on estimated auto-correlation function.
In order to carry out the method, provide radio base station for estimating the doppler spread of the signal being transmitted by the channel in radio circuit by subscriber equipment. Radio base station is arranged to be included in radio circuit. In addition, radio base station comprises receiving circuit, and this receiving circuit is configured to receive first signal and secondary signal from subscriber equipment. First signal and the secondary signal signal based on being transmitted by subscriber equipment, wherein first signal is separating aspect space, time and/or polarization with secondary signal. In addition, radio base station comprises the first estimating circuit, and this first estimating circuit is configured to the first channel estimating by received first signal and known signal being compared to estimate received first signal. In addition, radio base station comprises the second estimating circuit, and this second estimating circuit is configured to by received secondary signal and known signal being compared estimate that the second channel of received secondary signal estimates.
Radio base station also comprises determining unit, and this determining unit is configured to the ratio of determining that the first channel estimating and second channel are estimated. In addition, radio base station comprises estimates auto-correlation circuit, this estimation auto-correlation Circnit Layout become to estimate the auto-correlation function of function of definite ratio. Radio base station also comprises estimating Doppler expanded circuit, and this estimating Doppler expanded circuit is configured to carry out estimating Doppler expansion based on estimated auto-correlation function.
The ratio of the channel estimating of the reception signal of the estimation of doppler spread based on two separation, wherein signal is based on identical transmitted reference signal. This is by using for example two reception antennas to carry out. Thus, estimating Doppler when expansion the amplitude of the reference signal that transmits and the variation of phase place do not affect. Therefore, it is more accurate that doppler spread is estimated, thereby cause more effective transmission plan, link circuit self-adapting, scheduling etc., and these cause the improvement performance of radio circuit. In addition, estimate by more accurate doppler spread, in radio circuit, can realize higher throughput and data transfer rate.
Brief description of the drawings
To describe in more detail embodiment with respect to accompanying drawing now, accompanying drawing comprises:
Fig. 1 is the block diagram that radio circuit is shown,
Fig. 2 illustrates combination flow chart in radio circuit and the schematic diagram of signaling schemes,
Fig. 3 is the block diagram that radio base station is shown,
Fig. 4 is the schematic diagram that the chart of the curve of auto-correlation function is shown,
Fig. 5 is the block diagram of the method in radio base station, and
Fig. 6 is the block diagram of radio base station.
Detailed description of the invention
Fig. 1 illustrates the schematic diagram of radio circuit, for example Long Term Evolution (LTE), senior LTE, third generation partner program (3GPP) WCDMA (WCDMA) system, global system for mobile communications/enhancing data transfer rate GSM evolution (GSM/EDGE), World Interoperability for Microwave Access, WiMax (WiMax) or Ultra-Mobile Broadband (UMB), only enumerate some the possibility options for realizing embodiment disclosed herein.
Subscriber equipment (UE) 10 being served by radio base station 12 communicates by radio link and radio base station 12, and wherein communication is so-called up-link (UL) transmission. Radio base station 12 communicates with subscriber equipment 10 in so-called downlink (DL) transmission. Doppler frequency shift is the frequency displacement of the radio signal that run into by radio base station 12 in the time that subscriber equipment 10 and radio base station 12 move with speed v each other. That is to say, radio base station 12 can be fixing or mobile, and subscriber equipment 10 can be static or mobile, and the difference of speed between them is v along a direction.
Subscriber equipment 10 in UL to radio base station 12 original signal. Propagated and reflex time along the route to radio base station 12 when signal, the unlike signal (i.e. the first and second signals) that derives from primary signal will receive at radio base station 12. Therefore, radio base station 12 receives first signal and secondary signal from subscriber equipment 10. The first and second signals, based on primary signal, are still separating aspect for example space, time and/or polarization. In the time that the through-put power of subscriber equipment 10 affects amplitude and phase place, the variation through-put power of subscriber equipment 10 will change as the channel automatic correlative property being obtained from single reception signal. The mechanism that current embodiment herein provides the variation through-put power that is not subject to subscriber equipment 10 to affect. Radio base station 12 is by comparing received first signal and the initialize signal that is called again known signal to estimate the first channel estimating of first signal. In addition, radio base station 12 is estimated by received secondary signal and initialize signal being compared estimate the second channel of secondary signal. For example, in the reference signal that, received first signal and secondary signal can be comprised and radio base station 12, the known reference signal of storage compares.
Radio base station 12 is then by estimating that the first channel estimating determine divided by second channel the ratio of channel estimating. This ratio is to offset the transmission amplitude of doppler spread estimation and the dimensionless parameter of phase correlation. The ratio of channel estimating then in function for estimating auto-correlation function. Then the auto-correlation function of this estimation is expanded for estimating Doppler.
The doppler spread of so more accurately estimating can be used for the modulation of multiple-input and multiple-output (MIMO) pattern, DL transmission and coding, link circuit self-adapting, frequency selective scheduling etc.
Fig. 2 illustrates signal combined signalling and the flow chart in radio circuit. Radio circuit comprises mobile each other radio base station 12 and subscriber equipment 10.
Step 201. Subscriber equipment 10 transmits signal s to radio base station 12. Signal can be included in reference or the frequency pilot sign that radio base station 12 is known. Signal is along be divided into first signal s1 and secondary signal s2 to the route of radio base station. Therefore the first and second signal s1, s2 derive from same transmission signal, i.e. initial spike, and separating aspect space, polarization and/or time. The signal spatially separating is distinguished with the distance between it by reception antenna. The signal separating aspect polarization is distinguished by cross polarization reception antenna. The signal separating is in time distinguished in channel estimator. In addition, its combination can be used for distinguishing the first and second signals.
In the example shown, radio base station 12 is at the first antenna reception first signal s1 and at the second antenna reception secondary signal s2.
Step 202. Radio base station 12 estimates to come estimating Doppler expansion by first estimating the first channel estimating of first signal and the second channel of secondary signal. Then, radio base station is determined the ratio that the first channel estimating and second channel are estimated, and estimate the auto-correlation function of function of definite ratio. Then radio base station 12 carrys out estimating Doppler expansion based on estimated auto-correlation function.
Radio base station 12 has been eliminated conveyer impact by the ratio of the channel estimating based on the first and second signals by the estimation of doppler spread. That is to say, amplitude and the phase place of the signal that transmits are offset the impact of estimated doppler spread.
The block diagram of the radio base station 12 shown in Fig. 3 in radio circuit. In the example shown, radio base station 12 comprises the first antennaWith the second antenna. Baseband equivalence signalTo pass through antennaThe compound expression of the signal receiving. AntennaThe baseband equivalence signal of the sampled signal that receivesBecause the transmission of the reference signal S from subscriber equipment 10 is expressed as
(equation 1)
Wherein
K represents sample,
lRepresent to postpone index,
T represents the time,
A is the quantity of reception antenna,
Composite channel coefficient,
C is propagation channel, and
N is Noise and Interference.
To pass through antennaThe baseband equivalence signal receiving, andTo pass through antennaThe baseband equivalence signal receiving, that is, in this example。
The signal that transmits be reference signal S and between the transmission period of reference signal, be constant channel estimating for channel but may be different between subsequent transmission there is amplitudeAnd phase placeThe composite gain factorProduct.
It should be noted that composite channel coefficientPass throughComprise the composite gain factor. BecauseIn receiver, be unknown, so channel estimating is the estimation of composite channel.
To synthetic channel coefficients, for example, there is delay for arbitraryl 1AntennaComposite channel coefficientAnd there is delayl 0AntennaComposite channel coefficient, two composite channel coefficients all with the composite gain factor of transmissionProportional. The ratio of two independent composite channel coefficientsAuto-correlation reflection is got rid of to the coherence of channel of gain factor variations, make the estimation of doppler spread can not be subject to the variable effect of amplitude and the phase place of transmitted reference signal. Specifically, according to some embodiment herein, radio base station 12 comprises at least two reception antennas, thereby the separation of implementation space and/or polarization aspect provides at least two channel coefficients, one of each reception antenna thus all the time. In the example shown, the first channel estimator 303 is to passing through antennaThe baseband equivalence signal receivingCarry out channel estimating. Therefore, the first channel estimator 303 will comprise the baseband equivalence signal of reference signalCompare with the known reference signal of storage in radio base station 12. This produces the first channel estimating. Second channel estimator 305 is to passing through antennaThe baseband equivalence signal receivingCarry out channel estimating. Therefore, second channel estimator 305 will comprise the baseband equivalence signal of reference signalCompare with the known reference signal of storage in radio base station 12. This produces second channel and estimates. In embodiment herein, consider the normalization ratio g (t) of composite channel coefficient. Normalization ratio g (t) can be expressed as
(equation 2).
In the channel tap radio calculator 307 that is called again definite circuit, calculate Ratio Estimation. Ratio EstimationThe estimation of g (t), and according to the following formula from channel estimatingWithObtain
(equation 3).
In certain embodiments,, andl 0、l 1Two antennasWith'slMinimum of a value, make。
The auto-correlation function of g (t) is expressed as, and by normalized autocorrelation functionsWith doppler spread fDRepresent:
(equation 4)
Wherein
To postpone, that is, and two time instance t in the demonstration of g (t)0With t1Between time difference, and therebyDimension be the time.
Suppose the first and second signals of separationWithBe independent identically distributed stochastic variable, infer from symmetryFor real number. In addition R,g(0) equal 1 according to definition.
In estimate of autocorrelation device 309, the estimation of the auto-correlation function of g (t)-be expressed as-first obtain from the channel estimating of signal. Postpone to be called again sampling(k=0,1 ..., K-1) evenly spaced delay estimate auto-correlation function from following formula
(equation 5)
Wherein
K is the quantity that sampling postpones,
L is the quantity of estimated channel samples,
Be the Ratio Estimation of normalization ratio g, and obtain from channel estimating according to (equation 3),
Delay sampling interval,
lThe delay index relevant to the time of reception of the first and second signals,
Represent Ratio EstimationComplex conjugate, and
K carries out index to delay sample.
Once obtain the estimation of auto-correlation function, doppler spread can be estimated in analyzer 311. In one embodiment, doppler spread can be maximal possibility estimation, that is, maximal possibility estimation is the doppler spread that provides the maximum probability of the estimation of auto-correlation function.
Gap functionCan be calculated as estimated auto-correlation functionWith precalculated desirable auto-correlation functionSet between mean square error:
Wherein
Doppler spread is estimated as and makes gap functionFor minimum fDValue.
Embodiment herein allows the healthy and strong doppler spread in the amplitude of the signal that transmits wherein and system that phase place changes because of the variation of through-put power between transmission to estimate. By using the ratio of channel estimating, can eliminate the composite gain factor of estimating from different channels。
Above-mentioned normalized autocorrelation functionsCan calculate for uncorrelated rayleigh fading channel coefficient in number, and draw in Fig. 4. Normalized autocorrelation functionsValue define along y axle, and x defines along x axle. The auto-correlation function of different doppler spreads (Zoom version) can compare with estimated auto-correlation function, and from carrying out estimating Doppler expansion with the most similar auto-correlation function of estimated auto-correlation function. That is to say, have with estimated auto-correlation function the doppler spread of similar auto-correlation function be estimated doppler spread.
Now with reference to the flow chart shown in Fig. 5 describe according in some general embodiment, radio base station 12 for estimating the method step of doppler spread of the signal being transmitted by the channel of radio circuit by subscriber equipment 10. Step needn't be carried out according to the following stated order, but can carry out according to any suitable order. Radio base station 12 and subscriber equipment 10 are included in radio circuit.
Step 501. Radio base station 12 receives first signal and secondary signal from subscriber equipment 10. First signal and the secondary signal signal based on being transmitted by subscriber equipment 10, and first signal is separating aspect space, time and/or polarization with secondary signal. In certain embodiments, first signal can receive at the first antenna, and secondary signal can receive at the second antenna. By comparing in different spatial point and receive from secondary signal, by polarizing by different way compared with secondary signal, and/or by postponing in time compared with secondary signal, first signal can be separated with secondary signal.
Step 502. Radio base station 12, by received first signal and known signal are compared, is estimated the first channel estimating of received first signal.
Step 503. Radio base station 12, by received secondary signal and known signal are compared, estimates that the second channel of received secondary signal is estimated.
Step 504. Radio base station 12 is determined the ratio that the first channel estimating and second channel are estimated. In certain embodiments, ratio can be normalization ratio.
Step 505. Radio base station 12 estimate the auto-correlation function of function of definite ratio.
Step 506. Radio base station 12 is estimated the doppler spread of transmitted signal based on estimated auto-correlation function. Can be by estimated auto-correlation function and at least one precalculated auto-correlation function be compared, carry out estimating Doppler expansion. In addition, in certain embodiments, can, by making gap function for minimum, carry out estimating Doppler expansion, wherein gap function can be calculated as the mean square error between estimated auto-correlation function and at least one precalculated auto-correlation function.
In order to carry out the method, provide a kind of radio base station. Fig. 6 is the block diagram that the radio base station 12 of the doppler spread for estimating the signal being transmitted by the channel of radio circuit by subscriber equipment 10 is shown. Radio base station 12 is arranged to be included in radio circuit. Radio base station 12 comprises receiving circuit 601, and receiving circuit 601 is configured to receive first signal and secondary signal from subscriber equipment 10. First signal and the secondary signal signal based on being transmitted by subscriber equipment 10, and first signal is separating aspect space, time and/or polarization with secondary signal. Receiving circuit 601 can comprise the first antenna α that is configured to receive first signal0And be configured to receive the second antenna α of secondary signal1. In certain embodiments, first signal can be received to separate with secondary signal by comparing from secondary signal in different spatial point, and can be by antenna α0And α1Distinguish with the distance between it. As an alternative or supplement, first signal can be by compare from secondary signal, different polarization is received to be separated with secondary signal, and can be distinguished by cross polarised antenna. Therefore, the first antenna α0With the second antenna α1Can be cross-polarized. As an alternative or supplement, first signal can be by comparing and be delayed in time to separate with secondary signal, and then these signals are distinguished in channel estimator. Any combination that should be appreciated that separation is also possible.
Radio base station 12 also comprises that the first estimating circuit 602, the first estimating circuits 602 are corresponding with the first channel estimator 303 of Fig. 3, is configured to the first channel estimating by received first signal and known signal being compared to estimate received first signal. Radio base station 12 comprises the second channel estimator 305 of the second estimating circuit 603, the second estimating circuits 603 corresponding to Fig. 3, is configured to by received secondary signal and known signal being compared estimate that the second channel of received secondary signal estimates. In addition, radio base station 12 comprises determines circuit 604, determines the channel tap ratio calculator 307 of circuit 604 corresponding to Fig. 3, is configured to the ratio of determining that the first channel estimating and second channel are estimated. In certain embodiments, ratio can be normalization ratio.
Radio base station 12 also comprises estimates auto-correlation circuit 605, estimates the autocorrelation estimation device 309 of auto-correlation circuit 605 corresponding to Fig. 3, be configured to estimate the auto-correlation function of function of definite ratio. In addition, radio base station 12 comprises estimating Doppler expanded circuit 606, and doppler spread circuit 606, corresponding to the analyzer 311 of Fig. 3, is configured to carry out estimating Doppler expansion based on estimated auto-correlation function. In certain embodiments, estimating Doppler expanded circuit 606 can be configured by estimated auto-correlation function and at least one precalculated auto-correlation function are compared estimating Doppler expansion. In addition, estimating Doppler expanded circuit 606 can be configured by and makes gap function is that minimum is carried out estimating Doppler expansion, and wherein gap function is calculated as the mean square error between estimated auto-correlation function and at least one precalculated auto-correlation function.
The current mechanism that is used for the doppler spread of estimating the signal being transmitted by subscriber equipment can come together to realize together with the computer program code of the function for carrying out embodiment herein by one or more processors for the treatment of circuit 607 of all radio base stations 12 as shown in Figure 6 and so on. Said procedure code also can be used as computer program and provides, for example, take the form of the data medium of carrying the computer program code for carry out this solution in the time being loaded into radio base station 12. A kind of such carrier can be taked the form of CDROM dish. But it is feasible adopting other data medium such as memory stick. The pure program code that computer program code also can be used as on server provides, and downloads to radio base station 12.
In addition, radio base station 12 can comprise and is arranged for storage estimation, data, application to carry out the memory circuitry 608 of embodiment herein etc.
Here should be understood that, radio base station 12 can be called again for example NodeB, evolution NodeB (eNB, eNodeB), base station transceiver, access point base station, base station router or the community that can serve with radio base station 12 in any other NE of communicating of subscriber equipment, this depends on the radio access technologies and the term that for example used. Can or can represent subscriber equipment 10 with the device that radio base station 12 carries out any other kind of radio communication by for example wireless communication terminal, mobile cellular telephone, personal digital assistant (PDA), wireless platform, laptop computer, computer.
In drawing and description, example embodiment of the present invention is disclosed. But, can carry out many changes and amendment to these embodiment, and substantially not deviate from principle of the present invention. Therefore, although adopt concrete term,, they only use with general and describing significance, instead of limit, and scope of the present invention is limited by following claim.
Claims (12)
1. the method for the doppler spread of the signal being transmitted by the channel of radio circuit by subscriber equipment (10) for estimation in radio base station (12), described radio base station (12) and subscriber equipment (10) are included in described radio circuit, and described method comprises
-receive (501) first signal and secondary signal from described subscriber equipment (10), the signal that described first signal and secondary signal transmit based on described subscriber equipment (10), wherein said the first and second signals are separating aspect space, time and/or polarization
-by received first signal and known signal are compared, estimate the first channel estimating of (502) first signal that receives,
-by received secondary signal and described known signal are compared, estimate that the second channel of (503) secondary signal that receives is estimated,
The ratio that-definite (504) described first channel estimating and described second channel are estimated,
-estimate (505) the auto-correlation function of definite ratio, and
-estimate (506) described doppler spread based on estimated auto-correlation function.
The method of claim 1, wherein described first signal the first antenna () receive, and described secondary signal the second antenna () receive.
3. the method as described in any one in claim 1-2, wherein, by comparing in different spatial point and receive from described secondary signal, by polarizing by different way compared with described secondary signal, and/or by postponing in time compared with described secondary signal, described first signal is separated with described secondary signal.
4. the method as described in any one in claim 1-2, wherein, described ratio is normalization ratio.
5. the method as described in any one in claim 1-2, wherein, by estimated auto-correlation function and at least one precalculated auto-correlation function are compared, estimates described doppler spread.
6. method as claimed in claim 5, wherein, by making gap function for minimum, estimates described doppler spread, and described gap function is calculated as the mean square error between estimated auto-correlation function and described at least one precalculated auto-correlation function.
7. the radio base station (12) of the doppler spread of the signal being transmitted by the channel of radio circuit by subscriber equipment (10) for estimation, described radio base station (12) is arranged to be included in described radio circuit, and described radio base station (12) comprising:
Receiving circuit (601), be configured to receive first signal and secondary signal from described subscriber equipment (10), the signal that described first signal and secondary signal transmit based on described subscriber equipment (10), and wherein said the first and second signals are separating aspect space, time and/or polarization
The first estimating circuit (602,303), is configured to the first channel estimating by received first signal and known signal being compared to estimate received first signal,
The second estimating circuit (603,305), is configured to by received secondary signal and described known signal being compared estimate that the second channel of received secondary signal estimates,
Determine circuit (604,307), be configured to determine the ratio of described the first channel estimating and the estimation of described second channel,
Estimate auto-correlation circuit (605,309), be configured to estimate the auto-correlation function of definite ratio, and
Estimating Doppler expanded circuit (606,311), is configured to estimate described doppler spread based on estimated auto-correlation function.
8. radio base station as claimed in claim 7 (12), wherein, described receiving circuit comprise be configured to receive described first signal the first antenna () and be configured to receive described secondary signal the second antenna ()。
9. the radio base station (12) as described in any one in claim 7-8, wherein, by comparing in different spatial point and receive from described secondary signal, by polarizing by different way compared with described secondary signal, and/or by postponing in time compared with described secondary signal, described first signal is separated with described secondary signal.
10. the radio base station (12) as described in any one in claim 7-8, wherein, described ratio is normalization ratio.
11. radio base stations (12) as described in any one in claim 7-8, wherein, described estimating Doppler expanded circuit (311,606) is configured to by estimated auto-correlation function and at least one precalculated auto-correlation function are compared estimating Doppler expansion.
12. radio base stations as claimed in claim 11 (12), wherein, described estimating Doppler expanded circuit (311,606) being configured to by making gap function is that minimum is carried out estimating Doppler expansion, and described gap function is calculated as the mean square error between estimated auto-correlation function and described at least one precalculated auto-correlation function.
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| PCT/SE2010/051203 WO2012060751A1 (en) | 2010-11-04 | 2010-11-04 | A radio base station and a method therein for estimating a doppler spread |
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| US9112737B2 (en) * | 2013-03-06 | 2015-08-18 | Qualcomm Incorporated | Systems and methods for determining a channel variation metric |
| WO2017025116A1 (en) * | 2015-08-07 | 2017-02-16 | Huawei Technologies Co., Ltd. | Analog beamforming devices |
| CN106100692A (en) * | 2016-08-29 | 2016-11-09 | 东南大学 | MIMO OFDM underwater sound communication system doppler spread method of estimation |
| US11038719B2 (en) | 2019-04-30 | 2021-06-15 | Qualcomm Incorporated | Channel estimation for systems with PLL phase discontinuities |
| CN114244655B (en) * | 2021-12-16 | 2023-09-12 | 哲库科技(北京)有限公司 | Signal processing method and related device |
| WO2024033810A1 (en) * | 2022-08-08 | 2024-02-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Autocorrelation function characteristics estimation and reporting |
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| US8897385B2 (en) * | 2009-10-20 | 2014-11-25 | Maxlinear, Inc. | Doppler estimator for OFDM systems |
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2010
- 2010-11-04 WO PCT/SE2010/051203 patent/WO2012060751A1/en active Application Filing
- 2010-11-04 CN CN201080069929.XA patent/CN103181094B/en not_active Expired - Fee Related
- 2010-11-04 EP EP10859336.9A patent/EP2636158A4/en not_active Withdrawn
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| CN1351781A (en) * | 1999-03-22 | 2002-05-29 | 艾利森公司 | Doppler spread estimation system |
| US6680969B1 (en) * | 1999-03-22 | 2004-01-20 | Ericsson, Inc. | Methods for estimating doppler spreads including autocorrelation function hypotheses and related systems and receivers |
| WO2001013537A1 (en) * | 1999-08-12 | 2001-02-22 | Ericsson Inc | Doppler spread estimation using channel autocorrelation function hypotheses |
| CN1529970A (en) * | 2001-05-31 | 2004-09-15 | Ħ��������˾ | Poppler spread/velcocity estimation in mobile wireless communication device and methods thereof |
| WO2010008245A2 (en) * | 2008-07-17 | 2010-01-21 | Lg Electronics Inc. | Method and apparatus for transmitting reference signal in multiple antenna system |
Also Published As
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| WO2012060751A1 (en) | 2012-05-10 |
| CN103181094A (en) | 2013-06-26 |
| EP2636158A4 (en) | 2016-02-17 |
| EP2636158A1 (en) | 2013-09-11 |
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