CN103181094A - A radio base station and a method therein for estimating a doppler spread - Google Patents

A radio base station and a method therein for estimating a doppler spread Download PDF

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CN103181094A
CN103181094A CN201080069929XA CN201080069929A CN103181094A CN 103181094 A CN103181094 A CN 103181094A CN 201080069929X A CN201080069929X A CN 201080069929XA CN 201080069929 A CN201080069929 A CN 201080069929A CN 103181094 A CN103181094 A CN 103181094A
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signal
base station
radio base
channel
estimating
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CN103181094B (en
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O.莫里茨
G.彼得斯
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Telefonaktiebolaget LM Ericsson AB
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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
    • 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
    • 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
    • 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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  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

Embodiments herein relate to a method in a radio base station (12) for estimating Doppler spread of a signal transmitted by a user equipment (10) over a channel in a radio communications network. The radio base station (12) and user equipment (10) are comprised in the radio communications network. The radio base station (12) receives a first signal and a second signal from the user equipment (10), which first signal and second signal are based on the signal transmitted by the user equipment (10). The first and second signals are separated in space, time and/or polarisation. The radio base station (12) estimates a first channel estimate of the received first signal by comparing the received first signal to a known signal, and a second channel estimate of the received second signal by comparing the received second signal to the known signal. The radio base station (12) determines a ratio of the first channel estimate to the second channel estimate, and estimates an autocorrelation function of a function of the determined ratio. The radio base station (12) then estimates the Doppler spread based on the estimated autocorrelation function.

Description

Radio base station and the method that wherein is used for the estimating Doppler expansion
Technical field
Embodiment herein relates to radio base station and method wherein.Specifically, herein embodiment 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 the radio base station transmission of information, and radio base station along other direction in so-called down link (DL) transmission to the subscriber equipment transmission of information.Doppler frequency shift is the frequency displacement of the radio signal that run into by receiver when conveyer and receiver move each other.Doppler spread is a plurality of expansions that enter the Doppler frequency shift of office signaling ray from the conveyer to the receiver.Doppler spread causes the variation of the propagation channel between conveyer and receiver.The knowledge of doppler spread obtains many application in mobile communication system.This class is used and comprised: the receiver algorithm for example is used 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 duration of being correlated with, 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 effect for the multipath fading of scheduling and link circuit self-adapting coherence time, for example is used for using the time correlation scheduling of the mobile communication system such as evolved universal terrestrial radio access (E-UTRA) system and the Closed-Loop Spatial Multiplexing in down link.The period that is used for from subscriber equipment to radio base station transfer channel quality information report should be shorter coherence time than channel, is downlink channel status information accurately in order to be provided at 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, in order to realize the efficient uplink channel quality estimation between sounding reference signal transmission enhancement.
Doppler spread can be estimated with the doppler spread estimator according to many modes.One class doppler spread estimator is based on the time character of the channel estimating that receives 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 the 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 C c:
Figure 801922DEST_PATH_IMAGE001
Wherein
E is expected value operator,
c *The expression complex conjugate,
T is the time, and
τ postpones.
In theory, another auto-correlation function R of rayleigh fading channel tap cBe expressed as
Figure 594429DEST_PATH_IMAGE002
Wherein
C is constant,
J 0First kind zero Bessel function, and
f DIt is doppler spread.
From the estimation of auto-correlation function and the form known of auto-correlation function, doppler spread can be for example from
Figure 374166DEST_PATH_IMAGE003
The time
Figure 122769DEST_PATH_IMAGE004
Second dervative
Figure 812507DEST_PATH_IMAGE005
With
Figure 634970DEST_PATH_IMAGE006
Ratio:
Figure 275904DEST_PATH_IMAGE007
Perhaps estimate from maximal possibility estimation,
Wherein
Figure 474804DEST_PATH_IMAGE008
The expression doppler spread is estimated.
Doppler spread is estimated
Figure 19049DEST_PATH_IMAGE008
Also 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 usually.If there is the continuous or periodic transfer on 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 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 mobile communication system, for example E-UTRA, travelling carriage can change the delivering power between subsequent transmission.The phase place that this change changes amplitude and may also change the signal that transmits.Radio base station is estimated the composite channel by conveyer gains (being amplitude and phase place) and propagation channel forms.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 character can be from the auto-correlation function of propagation channel and character is very different At All Other Times At All Other Times, and therefore estimate it may is wrong based on the doppler spread of channel estimating.In general, the 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
The purpose of embodiment herein is to provide with reliable fashion comes estimating Doppler to expand to cause the mechanism of the better performance of radio circuit.
According to the aspect of herein embodiment, the method for the doppler spread of this purpose by being used for estimating the signal that the channel by radio circuit transmits by subscriber equipment in radio base station realizes.Radio base station and subscriber equipment are included in radio circuit.Radio base station receives first signal and secondary signal from subscriber equipment, and wherein first signal and secondary signal are based on the signal that is transmitted by subscriber equipment.In addition, the first and second signals are separating aspect space, time and/or polarization.
Radio base station is by comparing reception first signal and known signal to estimate the first channel estimating of the first signal that receives, and by reception secondary signal and known signal being compared to estimate the second channel of the secondary signal that receives 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 comes the estimating Doppler expansion based on estimated auto-correlation function.
In order to carry out the method, provide radio base station to be used for estimation by the doppler spread of subscriber equipment by the signal that channel was transmitted of radio circuit.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 secondary signal are based on the signal that is transmitted by subscriber equipment, and 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 by reception first signal and known signal being compared to estimate the first channel estimating of the first signal that receives.In addition, radio base station comprises the second estimating circuit, and this second estimating circuit is configured to estimate by the second channel that reception secondary signal and known signal is compared to estimate the secondary signal that receives.
Radio base station also comprises determining unit, and this determining unit is configured to determine the ratio of the first channel estimating and second channel estimation.In addition, radio base station comprises estimates the auto-correlation circuit, this estimate auto-correlation Circnit Layout become to estimate the auto-correlation function of function of definite ratio.Radio base station also comprises the estimating Doppler expanded circuit, and this estimating Doppler expanded circuit is configured to come the estimating Doppler expansion based on estimated auto-correlation function.
The estimation of doppler spread is based on the ratio of the channel estimating of the reception signal of two separation, and wherein signal is based on the identical reference signal that transmits.This is by for example using two reception antennas to carry out.When thus, estimating Doppler is expanded, 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, can realize more high-throughput and data transfer rate in radio circuit.
Description of 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 of chart that 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.
Embodiment
Fig. 1 illustrates the schematic diagram of radio circuit, for example Long Term Evolution (LTE), senior LTE, third generation partner program (3GPP) Wideband Code Division Multiple Access (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) are only enumerated be used to realizing that some of embodiment disclosed herein may options.
Subscriber equipment (UE) 10 that is 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 down link (DL) transmission.Doppler frequency shift is the frequency displacement of the radio signal that run into by radio base station 12 when 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 the 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 are based on primary signal, but separate aspect for example space, time and/or polarization.When 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 from the resulting channel automatic correlative property of single reception signal.The mechanism that current embodiment herein provides the variation through-put power that is not subjected to subscriber equipment 10 to affect.Radio base station 12 is by comparing reception 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 reception secondary signal and initialize signal being compared estimate the second channel of secondary signal.In the reference signal that for example, the first signal that receives 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.Then the ratio of channel estimating is used for estimating auto-correlation function in function.Then the auto-correlation function of this estimation is used for the estimating Doppler expansion.
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 the known reference of radio base station 12 or frequency pilot sign.Signal is divided into first signal s1 and secondary signal s2 along the route to 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 that spatially separates is distinguished with the distance between it by reception antenna.The signal that separates aspect polarization is distinguished by the cross polarization reception antenna.The signal that separates 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 by at first estimating first signal the first channel estimating and the second channel of secondary signal estimate to come the estimating Doppler expansion.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 comes the estimating Doppler expansion based on estimated auto-correlation function.
Radio base station 12 is by having eliminated the conveyer impact with the estimation of doppler spread based on the ratio of the channel estimating of the first and second signals.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 antenna
Figure 12413DEST_PATH_IMAGE009
With the second antenna
Figure 940311DEST_PATH_IMAGE010
The baseband equivalence signal
Figure 677323DEST_PATH_IMAGE011
To pass through antenna
Figure 279337DEST_PATH_IMAGE012
The compound expression of the signal that receives.Antenna
Figure 709181DEST_PATH_IMAGE012
The baseband equivalence signal of the sampled signal that receives
Figure 950807DEST_PATH_IMAGE011
Because the transmission from the reference signal S of subscriber equipment 10 is expressed as
Figure 599832DEST_PATH_IMAGE013
(equation 1)
Wherein
K represents sample,
lExpression postpones index,
T represents the time,
A is the quantity of reception antenna,
Figure 243303DEST_PATH_IMAGE014
The composite channel coefficient,
C is propagation channel, and
N is Noise and Interference.
To pass through antenna
Figure 979494DEST_PATH_IMAGE016
The baseband equivalence signal that receives, and
Figure 638402DEST_PATH_IMAGE017
To pass through antenna
Figure 136380DEST_PATH_IMAGE018
The baseband equivalence signal that receives, that is, in this example
The signal that transmits be reference signal S and between the transmission period of reference signal be the constant channel estimating that is used for channel but may be different between subsequent transmission have an amplitude
Figure 530769DEST_PATH_IMAGE020
And phase place
Figure 413274DEST_PATH_IMAGE021
The composite gain factor
Figure 342922DEST_PATH_IMAGE022
Product.
Should be noted that the composite channel coefficient
Figure 285470DEST_PATH_IMAGE023
By
Figure 723405DEST_PATH_IMAGE024
Comprise the composite gain factor Because
Figure 288695DEST_PATH_IMAGE026
Unknown in receiver, so channel estimating is the estimation of composite channel.
To synthetic channel coefficients, for example has delay for arbitrary l 1Antenna
Figure 778976DEST_PATH_IMAGE027
The composite channel coefficient
Figure 704207DEST_PATH_IMAGE028
And has a delay l 0Antenna
Figure 928514DEST_PATH_IMAGE029
The composite channel coefficient
Figure 865378DEST_PATH_IMAGE030
, two composite channel coefficients all with the composite gain factor of transmission
Figure 149728DEST_PATH_IMAGE031
Proportional.The ratio of two independent composite channel coefficients
Figure 936157DEST_PATH_IMAGE032
Auto-correlation will reflect and the coherence of the channel of getting rid of gain factor variations make the estimation of doppler spread can not be subjected to the amplitude of the reference signal that transmits and the variable effect of phase place.Specifically, according to some embodiment of this paper, 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, 303 pairs of the first channel estimators pass through antenna
Figure 964155DEST_PATH_IMAGE029
The baseband equivalence signal that receives Carry out channel estimating.Therefore, the first channel estimator 303 will comprise the baseband equivalence signal of reference signal
Figure 210777DEST_PATH_IMAGE034
Compare with the known reference signal of storage in radio base station 12.This produces the first channel estimating
Figure 110600DEST_PATH_IMAGE035
305 pairs of second channel estimators pass through antenna
Figure 676711DEST_PATH_IMAGE027
The baseband equivalence signal that receives
Figure 355210DEST_PATH_IMAGE036
Carry out channel estimating.Therefore, second channel estimator 305 will comprise the baseband equivalence signal of reference signal
Figure 715784DEST_PATH_IMAGE037
Compare with the known reference signal of storage in radio base station 12.This produces second channel and estimates
Figure 978269DEST_PATH_IMAGE038
In the embodiment of this paper, consider the normalization ratio g (t) of composite channel coefficient.Normalization ratio g (t) can be expressed as
(equation 2).
Calculate Ratio Estimation in being called again the channel tap radio calculator 307 of determining circuit
Figure 238666DEST_PATH_IMAGE040
Ratio Estimation The estimation of g (t), and according to the following formula from channel estimating
Figure 18458DEST_PATH_IMAGE042
With
Figure 67317DEST_PATH_IMAGE043
Obtain
(equation 3).
In certain embodiments,
Figure 422785DEST_PATH_IMAGE045
, and l 0, l 1Two antennas
Figure 518917DEST_PATH_IMAGE046
With
Figure 105888DEST_PATH_IMAGE047
lMinimum value, make
Figure 344977DEST_PATH_IMAGE048
The auto-correlation function of g (t) is expressed as
Figure 359200DEST_PATH_IMAGE049
, and by normalized autocorrelation functions With doppler spread f DExpression:
(equation 4)
Wherein
Figure 554449DEST_PATH_IMAGE052
To postpone, that is, and two time instance t in the demonstration of g (t) 0With t 1Between time difference, and thereby
Figure 864207DEST_PATH_IMAGE052
Dimension be the time.
Suppose the first and second signals of separation
Figure 934932DEST_PATH_IMAGE053
With
Figure 972027DEST_PATH_IMAGE054
Be independent identically distributed stochastic variable, infer from symmetry
Figure 811807DEST_PATH_IMAGE055
Be 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
Figure 292467DEST_PATH_IMAGE056
-at first the channel estimating from signal obtains.Postpone to be called again sampling (k=0,1 ..., K-1) evenly spaced delay estimate auto-correlation function from following formula
Figure 582951DEST_PATH_IMAGE058
(equation 5)
Wherein
K is the quantity that sampling postpones,
L is the quantity of estimated channel samples,
Figure 654068DEST_PATH_IMAGE059
Be the Ratio Estimation of normalization ratio g, and obtain from channel estimating according to (equation 3),
Figure 305629DEST_PATH_IMAGE060
The delay sampling interval,
lThe delay index relevant to the time of reception of the first and second signals,
Figure 350946DEST_PATH_IMAGE061
The expression Ratio Estimation
Figure 621521DEST_PATH_IMAGE062
Complex conjugate, and
K carries out index to delay sample.
In case 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 of maximum probability that provides the estimation of auto-correlation function.
The gap function
Figure 632257DEST_PATH_IMAGE064
Can be calculated as estimated auto-correlation function
Figure 899291DEST_PATH_IMAGE065
With precalculated desirable auto-correlation function
Figure 707978DEST_PATH_IMAGE066
Set between mean square error:
Figure 111277DEST_PATH_IMAGE067
Wherein
Figure 370220DEST_PATH_IMAGE068
Doppler spread is estimated as makes the gap function
Figure 790397DEST_PATH_IMAGE069
F for minimum DValue.
Herein embodiment allows the healthy and strong doppler spread estimation in system that the amplitude of the signal that transmits wherein and phase place change because of the variation of through-put power between transmitting.By using the ratio of channel estimating, can eliminate the composite gain factor of estimating from different channels
Figure 527409DEST_PATH_IMAGE070
Above-mentioned normalized autocorrelation functions
Figure 660582DEST_PATH_IMAGE071
Can calculate for uncorrelated rayleigh fading channel coefficient in number, and draw in Fig. 4.Normalized autocorrelation functions Value define along the y axle, and x defines along the x axle.The auto-correlation function of different doppler spreads (namely
Figure 66472DEST_PATH_IMAGE071
Zoom version) can compare with estimated auto-correlation function, and from coming 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 flow chart shown in Figure 5, method step according to doppler spread that be used for to estimate the signal that the channel by radio circuit transmits by subscriber equipment 10 in some general embodiment, radio base station 12 is described.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 secondary signal are based on the signal that is 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.Receive by comparing in different spatial point from secondary signal, polarize by comparing by different way with secondary signal, and/or postpone by comparing with secondary signal in time, first signal can be separated with secondary signal.
Step 502.Radio base station 12 is estimated the first channel estimating of the first signal that receives by institute's reception first signal and known signal are compared.
Step 503.Radio base station 12 estimates that by institute's reception secondary signal and known signal are compared the second channel of the secondary signal that receives 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 the 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 the signal that transmits based on estimated auto-correlation function.Can by estimated auto-correlation function and at least one precalculated auto-correlation function are compared, come the estimating Doppler expansion.In addition, in certain embodiments, can come the estimating Doppler expansion by making the gap function for minimum, wherein the 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 illustrates for the radio base station 12 of the doppler spread of estimating the signal that the channel by radio circuit transmits by subscriber equipment 10.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 secondary signal are based on the signal that is 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 signal 0And the second antenna α that is configured to receive secondary signal 1In certain embodiments, first signal can separate with secondary signal by comparing from secondary signal to be received in different spatial point, and can be by antenna α 0And α 1Distinguish with the distance between it.As an alternative or supplement, first signal can be by different polarization is received to be separated with secondary signal to compare from secondary signal, and can be distinguished by cross polarised antenna.Therefore, the first antenna α 0With the second antenna α 1Can be cross-polarized.As an alternative or supplement, first signal can be delayed to separate by comparing with secondary signal in time, and then these signals are distinguished in channel estimator.Any combination that should be appreciated that separation is also possible.
Radio base station 12 comprises that also the first estimating circuit 602, the first estimating circuits 602 are corresponding with the first channel estimator 303 of Fig. 3, is configured to by reception first signal and known signal being compared to estimate the first channel estimating of the first signal that receives.Radio base station 12 comprises the second estimating circuit 603, the second estimating circuits 603 corresponding to the second channel estimator 305 of Fig. 3, is configured to estimate by the second channel that reception secondary signal and known signal is compared to estimate the secondary signal that receives.In addition, radio base station 12 comprises determines circuit 604, determines circuit 604 corresponding to the channel tap ratio calculator 307 of 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 the normalization ratio.
Radio base station 12 also comprises estimates auto-correlation circuit 605, estimates auto-correlation circuit 605 corresponding to the autocorrelation estimation device 309 of 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 is configured to come the estimating Doppler expansion based on estimated auto-correlation function corresponding to the analyzer 311 of Fig. 3.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 the estimating Doppler expansion.In addition, estimating Doppler expanded circuit 606 can be configured by and makes the gap function is that minimum is come the estimating Doppler expansion, and wherein the gap function calculation is the mean square error between estimated auto-correlation function and at least one precalculated auto-correlation function.
One or more processors of be used for estimating treatment circuit 607 that the current mechanism of the doppler spread of the signal that transmitted by subscriber equipment can be by all radio base stations 12 as shown in Figure 6 and so on come together to realize together with the computer program code of the function of the embodiment that is used for carrying out this paper.The said procedure code also can be used as computer program and provides, and for example takes to carry the form for the data medium of the computer program code of carrying out this solution when being loaded into radio base station 12.A kind of such carrier can be taked the form of CD ROM 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 with the memory circuitry 608 of the embodiment that carries out this paper etc.
Here should be understood that, radio base station 12 can be called again for example NodeB, evolution Node B (eNB, eNode B), base station transceiver, access point base station, base station router or the residential quarter that can serve with radio base station 12 in any other network element of communicating of subscriber equipment, this depends on radio access technologies and the term that for example uses.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 modification to these embodiment, and basically not deviate from principle of the present invention.Therefore, although adopt concrete term,, they only use with general and describing significance, rather than limit, and scope of the present invention is limited by following claim.

Claims (12)

1. method of be used for estimating the doppler spread of the signal that the channel by radio circuit transmits by subscriber equipment (10) 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 receiving first signal and known signal compares with described, estimate (502) described first channel estimating that receives first signal,
-by receiving secondary signal and described known signal compares with described, estimate that (503) described second channel that receives secondary signal estimates,
The ratio that-definite (504) described first channel estimating and described second channel are estimated,
-estimate (505) described the auto-correlation function of function of definite ratio, and
-estimate (506) described doppler spread based on described estimated auto-correlation function.
The method of claim 1, wherein described first signal the first antenna ( ) receive, and described secondary signal the second antenna (
Figure DEST_PATH_IMAGE004
) receive.
3. method as described in any one in claim 1-2, wherein, receive by comparing in different spatial point from described secondary signal, polarize by comparing by different way with described secondary signal, and/or postpone by comparing with described secondary signal in time, described first signal is separated with described secondary signal.
4. method as described in any one in claim 1-3, wherein, described ratio is the normalization ratio.
5. method as described in any one in claim 1-4, wherein, by described estimated auto-correlation function and at least one precalculated auto-correlation function are compared, estimate described doppler spread.
6. method as claimed in claim 5, wherein, by making the gap function for minimum, estimate described doppler spread, described gap function calculation is the mean square error between described estimated auto-correlation function and described at least one precalculated auto-correlation function.
7. radio base station (12) of be used for estimating the doppler spread of the signal that the channel by radio circuit transmits by subscriber equipment (10), 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 by receiving first signal and known signal compares to estimate described the first channel estimating that receives first signal with described,
The second estimating circuit (603,305) is configured to by described secondary signal and the described known signal of receiving compared to estimate that the described second channel that receives 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 the function of described definite ratio, and
Estimating Doppler expanded circuit (606,311) is configured to estimate described doppler spread based on described estimated auto-correlation function.
8. radio base station as claimed in claim 7 (12), wherein, described receiving circuit comprise the first antenna of being configured to receive described first signal (
Figure DEST_PATH_IMAGE002A
) and be configured to receive described secondary signal the second antenna ( ).
9. radio base station as described in any one in claim 7-8 (12), wherein, receive by comparing in different spatial point from described secondary signal, polarize by comparing by different way with described secondary signal, and/or postpone by comparing with described secondary signal in time, described first signal is separated with described secondary signal.
10. radio base station as described in any one in claim 7-9 (12), wherein, described ratio is the normalization ratio.
11. radio base station as described in any one in claim 7-10 (12), wherein, described estimating Doppler expanded circuit (311,606) is configured to by described estimated auto-correlation function and at least one precalculated auto-correlation function are compared the estimating Doppler expansion.
12. radio base station as described in any one in claim 7-11 (12), wherein, described estimating Doppler expanded circuit (311,606) being configured to by making the gap function is that minimum is come the estimating Doppler expansion, and described gap function calculation is the mean square error between described estimated auto-correlation function and described at least one precalculated auto-correlation function.
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