CN102892152B - A kind of adaptive transmission method and system - Google Patents
A kind of adaptive transmission method and system Download PDFInfo
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- CN102892152B CN102892152B CN201110201951.1A CN201110201951A CN102892152B CN 102892152 B CN102892152 B CN 102892152B CN 201110201951 A CN201110201951 A CN 201110201951A CN 102892152 B CN102892152 B CN 102892152B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
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Abstract
The present invention relates to a kind of adaptive transmission method, including, according to the down converted frequencies of reception system and the adaptive parameter that tests the speed of pilot data interval time constructionWherein T to construct during corresponding first kind Oth order Bessel function under each channel cross-correlation time interval, it is determined that the outer corresponding maximal function value of first monotony interval of each curve；The cross-correlation time interval for being channel is τiWhen, the upper limit of effective speed can be estimated；M ternary real number group is selected from the adaptive parameter that tests the speed according to practical application factor, according to selected ternary real number group, calculating obtains channel cross-correlation time interval for τiThe average R of Shi Xindao cross correlation valuesi, and autocorrelation value average Ai；According to Ri/AiWhether speed class that T judge mobile terminal is more than；Adaptive Transmission is carried out according to the speed of mobile terminal grade.The present invention also provides a kind of Adaptive Transmission system.Using technical scheme, the False Rate of speed type is reduced.
Description
Technical field
The present invention relates to wireless communication field, particularly a kind of adaptive transmission method and system.
Background technology
3GPP LTE (Long Term Evolution, long evolving system) technology is used as UMTS (Universal
Mobile Telecommunications System, UMTS) technology evolution, be high-speed mobile use
Family provides high-quality multimedia access service.Descending use OFDMA (Orthogonal Frequency in LTE system
Division Multiple Access, OFDMA technology), up use SC-FDMA (Single-carrier
Frequency-Division Multiple Access, single-carrier frequency division multiple access technology).But OFDMA technologies, high speed is moved
The Doppler spread of movable property life is very sensitive, because Doppler spread can result in the interference between subcarrier so that systematicness
It can degenerate.Therefore enter to eliminate the influence of Doppler spread it is necessary to the translational speed to Doppler spread mobile terminal in other words
The effective estimation of row.Effective estimation of translational speed, while preferable channel change message can be also provided for upper strata, and these
Information can be used in a series of Adaptive Transmission decision-makings such as handover, dynamic channel resource allocation, Power Control.
The velocity measuring technique for being currently based on Rayleigh channels is, according to such as drag (1), to estimate to move terminal velocity
Meter.
Wherein h is channel response, J0It is first kind Oth order Bessel function, as shown in figure 1, fd is maximum Doppler frequency
Rate, τ is channel cross-correlation time interval, and t is initial time.
Particular technique based on the model is：Obtain channel autocorroelation function E { h (t) h*} and cross-correlation function E { h (t)
(t)h*(t+ τ) }, maximum doppler frequency fd is obtained so that it is determined that translational speed by LUT Method.
Research is found, during toward upper strata transmission speed information, is not usually required to the exact value of transmission speed；But to mobile whole
Do a high speed, middling speed, the judgement of low speed in end.Current way be withFunctional value, it is counter to solve the first kind
The value of independent variable in first monotony interval of Oth order Bessel function, obtains maximum doppler frequency fd, is then asked by fd
Go out the speed of mobile terminal, judge the speed type of mobile terminal finally according to the threshold value of the high, medium and low speed of setting, adopt
With this method, when judging low by accident at a high speed, low speed just judges height by accident, when low speed on the contrary judges low by accident, just judges by accident at a high speed high, it is impossible to effectively right
The speed of mobile terminal is estimated.
The content of the invention
Present invention solves the technical problem that being the provision of a kind of adaptive transmission method, to solve in the prior art to moving
Dynamic terminal velocity estimates the problem of accuracy is low, in addition, present invention also offers a kind of Adaptive Transmission system.
To solve the above problems, the invention provides a kind of adaptive transmission method, including,
According to the down converted frequencies of reception system and the adaptive parameter that tests the speed of pilot data interval time constructionWherein T is to construct corresponding first kind zeroth order under each channel cross-correlation time interval
During Bessel functions, it is determined that the outer corresponding maximal function value of first monotony interval of each curve；It is the mutual of channel
Pass time interval is τiWhen, the upper limit of effective speed can be estimated；
M ternary real number group is selected from the adaptive parameter that tests the speed according to practical application factor, according to selected
Ternary real number group, calculating obtains channel cross-correlation time interval for τiThe average R of Shi Xindao cross correlation valuesi, and autocorrelation value is equal
Value Ai；According to Ri/AiWhether speed class that T judge mobile terminal is more than；
Adaptive Transmission is carried out according to the speed of mobile terminal grade.
Above-mentioned method, wherein, the down converted frequencies and pilot symbol interval time construction according to reception system are certainly
Adaptation is tested the speed parameterSpecifically,
The down converted frequencies of reception system are obtained, while according between the frame structure acquisition pilot data time for receiving data
Every the pilot data time interval is used as channel cross-correlation time interval；
According to the down converted frequencies of acquisition, corresponding first kind zeroth order under the various channel cross-correlation time intervals is obtained
Bessel functions with velocity variations curve；
Determine outside first monotony interval of each curve, corresponding maximal function value T；
Maximal function value T is intersected as decision threshold with each curve in first monotony interval, a ternary is constituted
The set of real number group (Ω, T, τ), is the parameter that adaptively tests the speedWherein Ω is intersection point
Abscissa, τ is the corresponding channel cross-correlation time interval of curve where intersection point.
Above-mentioned method, wherein, the practical application factor includes, and transmission mode switching and frequency select the defined low speed upper limit
With the middling speed upper limit.
Above-mentioned method, wherein, when m ternary real number group of selection is 2 from the adaptive parameter that tests the speed, according to institute
The ternary real number group of selection, calculating obtains channel cross-correlation time interval for τiThe average R of Shi Xindao cross correlation valuesi, and auto-correlation
The average A of valuei；According to Ri/AiWhether be more than T judge mobile terminal speed class specifically,
Choose two ternary real number group (Ω1, T, τ1) and (Ω2, T, τ2), wherein Ω1It is also that channel is mutual for the upper limit of low speed
Relevant periods are τ1When effective estimating speed the upper limit；Ω2It is also channel cross-correlation time interval for the upper limit of middling speed
For τ2When effective estimating speed the upper limit, wherein τ1＞ τ2；
Frequency pilot sign is chosen in data are received and is mutually divided into τ1And τ2Frequency pilot sign corresponding channel impulse response value difference
Stored；
According to the channel impulse response value of storage, it is τ to calculate channel cross-correlation time interval1Shi Xindao cross correlation values it is equal
Value R1With the average A of autocorrelation value1；And channel cross-correlation time interval is τ2When, the average R of channel cross correlation value2With from phase
The average A of pass value2；
Judge R1/A1Whether T is more than, if so, the speed for being judged as tested mobile terminal is low speed；Otherwise, R is judged2/A2
Whether T is more than, if so, the speed of mobile terminal is middling speed, otherwise at a high speed.
Above-mentioned method, wherein, the calculating obtains channel cross-correlation time interval for τiShi Xindao cross correlation values it is equal
Value Ri, and autocorrelation value average AiSpecifically,
The average R of the cross correlation valueiFor,
The average A of autocorrelation valueiFor
Wherein h*Represent plural number h conjugation；Rung for the corresponding channel frequency of k-th of subcarrier of i-th of ofdm symbol
Should, N is ofdm symbol lengths.
Present invention also offers a kind of Adaptive Transmission system, including,
Auto-adaptive parameter constructing module, is constructed for the down converted frequencies according to reception system and pilot data interval time
The adaptive parameter that tests the speedWherein T is corresponding under each channel cross-correlation time interval to construct
The first kind Oth order Bessel function when, it is determined that the outer corresponding maximal function value of first monotony interval of each curve；
The cross-correlation time interval for being channel is τiWhen, the upper limit of effective speed can be estimated；
Adaptive speed measuring module, for selecting m ternary from the adaptive parameter that tests the speed according to practical application factor
Real number group, according to selected ternary real number group, calculating obtains channel cross-correlation time interval for τiShi Xindao cross correlation values
Average Ri, and autocorrelation value average Ai；According to Ri/AiWhether speed class that T judge mobile terminal is more than；
Adaptive Transmission module, for carrying out Adaptive Transmission according to the speed of mobile terminal grade.
Above-mentioned system, wherein, the auto-adaptive parameter constructing module is according to the down converted frequencies and pilot tone of reception system
The adaptive parameter that tests the speed of symbol interval constructionSpecifically,
The down converted frequencies of reception system are obtained, while according between the frame structure acquisition pilot data time for receiving data
Every the pilot data time interval is used as channel cross-correlation time interval；
According to the down converted frequencies of acquisition, corresponding first kind zeroth order under the various channel cross-correlation time intervals is obtained
Bessel functions with velocity variations curve；
Determine outside first monotony interval of each curve, corresponding maximal function value T；
Maximal function value T is intersected as decision threshold with each curve in first monotony interval, a ternary is constituted
The set of real number group (Ω, T, τ), is the parameter that adaptively tests the speedWherein Ω is intersection point
Abscissa, τ is the corresponding channel cross-correlation time interval of curve where intersection point.
Above-mentioned system, wherein, the adaptive speed measuring module is used for selection m three from the adaptive parameter that tests the speed
When first real number group is 2, according to selected ternary real number group, calculating obtains channel cross-correlation time interval for τiShi Xindao is mutual
The average R of correlationi, and autocorrelation value average Ai；According to Ri/AiWhether judge that the speed class of mobile terminal is specific more than T
For,
Choose two ternary real number group (Ω1, T, τ1) and (Ω2, T, τ2), wherein Ω1It is also that channel is mutual for the upper limit of low speed
Relevant periods are τ1When effective estimating speed the upper limit；Ω2It is also channel cross-correlation time interval for the upper limit of middling speed
For τ2When effective estimating speed the upper limit, wherein τ1＞ τ2；
Frequency pilot sign is chosen in data are received and is mutually divided into τ1And τ2Frequency pilot sign corresponding channel impulse response value difference
Stored；
According to the channel impulse response value of storage, it is τ to calculate channel cross-correlation time interval1Shi Xindao cross correlation values it is equal
Value R1With the average A of autocorrelation value1；And channel cross-correlation time interval is τ2When, the average R of channel cross correlation value2With from phase
The average A of pass value2；
Judge R1/A1Whether T is more than, if so, the speed for being judged as tested mobile terminal is low speed；Otherwise, R is judged2/A2
Whether T is more than, if so, the speed of mobile terminal is middling speed, otherwise at a high speed.
Using technical scheme, by being configured to the relevant parameter adaptively tested the speed, speed type is reduced
False Rate；Under conditions of first monotony interval negates function, utilized not to first kind Oth order Bessel function in addition
Judgement of the realization of these parameter adaptives to speed of mobile terminal grade, further adaptively realizes that mobile terminal is high
Speed, middling speed, the judgement of low speed.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the present invention, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is first kind Oth order Bessel function curve；
Fig. 2 is a kind of adaptive transmission method flow chart of the invention；
Fig. 3 is the flow chart that the embodiment of the present invention constructs adaptive judgement parameter；
Graph of a relation between Fig. 4 theoretical velocities and channel cross-correlation time interval；
Fig. 5 is the adaptive parametric configuration schematic diagram that tests the speed；
Fig. 6 is effective speed area schematic；
Fig. 7 is the flow chart that the embodiment of the present invention adaptively tests the speed；
Fig. 8 is that the basic, normal, high three kinds of speed parameters of estimation choose schematic diagram；
Fig. 9 is a kind of Adaptive Transmission system construction drawing of the invention.
Embodiment
In order that technical problems, technical solutions and advantages to be solved are clearer, clear, tie below
Drawings and examples are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
As shown in Fig. 2 be a kind of adaptive transmission method flow chart of the invention, including,
Step S201, according to the down converted frequencies of reception system and the adaptive parameter that tests the speed of pilot data interval time constructionWherein T is to construct corresponding first kind zeroth order under each channel cross-correlation time interval
During Bessel functions, it is determined that the outer corresponding maximal function value of first monotony interval of each curve；It is the mutual of channel
Pass time interval is τiWhen, the upper limit of effective speed can be estimated；
Step S202, m ternary real number group is selected according to practical application factor from the adaptive parameter that tests the speed, according to
Selected ternary real number group, calculating obtains channel cross-correlation time interval for τiThe average R of Shi Xindao cross correlation valuesi, and from phase
The average A of pass valuei；According to Ri/AiWhether speed class that T judge mobile terminal is more than；
Step S203, Adaptive Transmission is carried out according to the speed of mobile terminal grade.
As described in Figure 3, it is the flow chart of construction adaptive judgement parameter of the embodiment of the present invention, specifically includes,
Step S301, the down converted frequencies f used when system receives data is obtained according to current systemcHz, while root
Pilot symbol interval time set t is obtained according to the frame structure for receiving data1, t2, t3, t4, t5, t6, t7, t8, t9, t10, this time
It is spaced the cross-correlation time interval as channel；
Step S302, according to the down converted frequencies f of reception systemcHz, the first kind zeroth order carried by Matlab
Bessel functions, draw with upper signal channel cross-correlation time interval, with the curve of velocity variations, wherein t respectively1＜ t2＜ t3＜
t4＜ t5＜ t6＜ t7＜ t8＜ t9＜ t10, as shown in figure 4, being the relation between theoretical velocity and channel cross-correlation time interval
Figure；
As can be seen from Figure 4, the cross-correlation time interval of every kind of channel, all corresponds to a maximum tachometric survey scope.And
With being gradually reduced for channel cross-correlation time interval, the scope of this measurement gradually increases；But corresponding curve part during low speed
Slope is divided to taper into, if at this moment with τ=t as shown in Figure 41Channel cross-correlation time interval, do low speed estimation, by mistake
Difference is just very big.
Step S303, statistical channel cross-correlation time interval is t1, t2, t3, t4, t5, t6, t7, t8, t9, t10Corresponding song
Maximal function value T outside line, first monotony interval；
Step S304, draws horizontal line, with each curve in first monotony interval using maximal function value T as decision threshold
Intersect as shown in figure 5, the corresponding channel cross-correlation time interval of curve where the coordinate of each intersection point, and intersection point is constituted one
Ternary real number is to gathering as adaptive judgement parameter：
WhereinThe cross-correlation time interval for being channel is τiWhen, the upper limit of the corresponding effective speed that can be estimated, tool
Body is as shown in Figure 6.
As shown in fig. 7, be the flow chart that the embodiment of the present invention adaptively tests the speed, including,
Step S701, according to the requirement of application (such as defined in transmission mode switching and frequency choosing in the low speed upper limit and middling speed
Limit), chosen in parameter sets (2), The ginseng judged as high, medium and low three kinds of speed adaptives
Number, it is specific as shown in Figure 8；
Step S702, reception system chooses pilot symbol interval for τ from the data of reception10=t10And τ3=t3Pilot tone is accorded with
Number, and their corresponding channel impulse response values are calculated, they are stored respectively；
Step S703, according to the channel impulse response value of storage, it is τ to calculate channel cross-correlation time interval10=t10When
Shown in the average of channel cross correlation value such as formula (3), shown in the average such as formula (4) of autocorrelation value：
WhereinRepresent τ10Corresponding OFDM symbol number
Wherein h*Plural number h conjugation is represented,Represent that the corresponding channel frequency of k-th of subcarrier of i-th of ofdm symbol rings
Should, N represents ofdm symbol lengths；
Step S704, judgesWhether T is more than, if it is, the speed for being judged as tested mobile terminal is low speed；Such as
Fruit is less than or equal to, and it is τ to calculate channel cross-correlation time interval3When, the average of channel cross correlation valueWith the average of autocorrelation valueJudgeWhether T is more than, if it is, the speed of mobile terminal is middling speed, otherwise at a high speed.
Embodiments of the invention are not limited in the adaptive judgement of three kinds of speed of low speed, middling speed and high speed, can also
Two, the speed class of four or more are divided into, it judges that principle is identical with the embodiment of the above method, falls within the present invention
Claimed scope.
As shown in figure 9, present invention also offers a kind of Adaptive Transmission system, including,
Auto-adaptive parameter constructing module, is constructed for the down converted frequencies according to reception system and pilot data interval time
The adaptive parameter that tests the speedWherein T is corresponding under each channel cross-correlation time interval to construct
The first kind Oth order Bessel function when, it is determined that the outer corresponding maximal function value of first monotony interval of each curve；
The cross-correlation time interval for being channel is τiWhen, the upper limit of effective speed can be estimated；
Adaptive speed measuring module, for selecting m ternary from the adaptive parameter that tests the speed according to practical application factor
Real number group, according to selected ternary real number group, calculating obtains channel cross-correlation time interval for τiShi Xindao cross correlation values
Average Ri, and autocorrelation value average Ai；According to Ri/AiWhether speed class that T judge mobile terminal is more than；
Adaptive Transmission module, for carrying out Adaptive Transmission according to the speed of mobile terminal grade.
In above-mentioned system, wherein,
The auto-adaptive parameter constructing module is according to the down converted frequencies and pilot symbol interval time construction of reception system
The adaptive parameter that tests the speedSpecifically,
The down converted frequencies of reception system are obtained, while according between the frame structure acquisition pilot data time for receiving data
Every the pilot data time interval is used as channel cross-correlation time interval；
According to the down converted frequencies of acquisition, corresponding first kind zeroth order under the various channel cross-correlation time intervals is obtained
Bessel functions with velocity variations curve；
Determine outside first monotony interval of each curve, corresponding maximal function value T；
Maximal function value T is intersected as decision threshold with each curve in first monotony interval, a ternary is constituted
The set of real number group (Ω, T, τ), is the parameter that adaptively tests the speedWherein Ω is intersection point
Abscissa, τ is the corresponding channel cross-correlation time interval of curve where intersection point.
When the adaptive speed measuring module is 2 for selecting m ternary real number group from the adaptive parameter that tests the speed,
According to selected ternary real number group, calculating obtains channel cross-correlation time interval for τiThe average R of Shi Xindao cross correlation valuesi, and
The average A of autocorrelation valuei；According to Ri/AiWhether be more than T judge mobile terminal speed class specifically,
Choose two ternary real number group (Ω1, T, τ1) and (Ω2, T, τ2), wherein Ω1It is also that channel is mutual for the upper limit of low speed
Relevant periods are τ1When effective estimating speed the upper limit；Ω2It is also channel cross-correlation time interval for the upper limit of middling speed
For τ2When effective estimating speed the upper limit, wherein τ1＞ τ2；
Frequency pilot sign is chosen in data are received and is mutually divided into τ1And τ2Frequency pilot sign corresponding channel impulse response value difference
Stored；
According to the channel impulse response value of storage, it is τ to calculate channel cross-correlation time interval1Shi Xindao cross correlation values it is equal
Value R1With the average A of autocorrelation value1；And channel cross-correlation time interval is τ2When, the average R of channel cross correlation value2With from phase
The average A of pass value2；
Judge R1/A1Whether T is more than, if so, the speed for being judged as tested mobile terminal is low speed；Otherwise, R is judged2/A2
Whether T is more than, if so, the speed of mobile terminal is middling speed, otherwise at a high speed.
A preferred embodiment of the present invention has shown and described in described above, but as previously described, it should be understood that the present invention
Be not limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and available for various other combinations,
Modification and environment, and above-mentioned teaching or the technology or knowledge of association area can be passed through in invention contemplated scope described herein
It is modified., then all should be in this hair and the change and change that those skilled in the art are carried out do not depart from the spirit and scope of the present invention
In the protection domain of bright appended claims.
Claims (8)
1. a kind of adaptive transmission method, it is characterised in that including,
According to the down converted frequencies of reception system and the adaptive parameter that tests the speed of pilot data interval time constructionWherein T is to construct corresponding first kind zeroth order under each channel cross-correlation time interval
During Bessel functions, it is determined that the outer corresponding maximal function value of first monotony interval of each curve；It is the mutual of channel
Pass time interval is τiWhen, the upper limit of effective speed can be estimated；
M ternary real number group is selected from the adaptive parameter that tests the speed according to practical application factor, according to selected ternary
Real number group, calculating obtains channel cross-correlation time interval for τiThe average R of Shi Xindao cross correlation valuesi, and autocorrelation value average
Ai；According to Ri/AiWhether speed class that T judge mobile terminal is more than；
Adaptive Transmission is carried out according to the speed of mobile terminal grade.
2. according to the method described in claim 1, it is characterised in that described to be accorded with according to the down converted frequencies and pilot tone of reception system
The adaptive parameter that tests the speed of number interval time constructionSpecifically,
The down converted frequencies of reception system are obtained, while obtaining pilot data time interval, institute according to the frame structure for receiving data
Pilot data time interval is stated as channel cross-correlation time interval；
According to the down converted frequencies of acquisition, corresponding first kind zeroth order under each described channel cross-correlation time interval is obtained
Bessel functions with velocity variations curve；
Determine outside first monotony interval of each curve, corresponding maximal function value Τ；
Maximal function value T is intersected as decision threshold with each curve in first monotony interval, a ternary real number is constituted
The set of group (Ω, T, τ), is the parameter that adaptively tests the speedWherein Ω is the horizontal seat of intersection point
Mark, τ is the corresponding channel cross-correlation time interval of curve where intersection point.
3. method according to claim 2, it is characterised in that the practical application factor includes, transmission mode switching and
Frequency selects the defined low speed upper limit and the middling speed upper limit.
4. method according to claim 3, it is characterised in that m ternary of selection is real from the adaptive parameter that tests the speed
When array is 2, according to selected ternary real number group, calculating obtains channel cross-correlation time interval for τiShi Xindao cross-correlation
The average R of valuei, and autocorrelation value average Ai；According to Ri/AiWhether be more than T judge mobile terminal speed class specifically,
Choose two ternary real number group (Ω1,T,τ1) and (Ω2,T,τ2), wherein Ω1It is also channel cross-correlation for the upper limit of low speed
Time interval is τ1When effective estimating speed the upper limit；Ω2It is also that channel cross-correlation time interval is τ for the upper limit of middling speed2
When effective estimating speed the upper limit, wherein τ1>τ2；
Frequency pilot sign is chosen in data are received and is mutually divided into τ1And τ2The corresponding channel impulse response value of frequency pilot sign carry out respectively
Storage；
According to the channel impulse response value of storage, it is τ to calculate channel cross-correlation time interval1The average R of Shi Xindao cross correlation values1
With the average A of autocorrelation value1；And channel cross-correlation time interval is τ2When, the average R of channel cross correlation value2And autocorrelation value
Average A2；
Judge R1/A1Whether T is more than, if so, the speed for being judged as tested mobile terminal is low speed；Otherwise, R is judged2/A2It is whether big
In T, if so, the speed of mobile terminal is middling speed, otherwise at a high speed.
5. the method according to claim 1 or 4, it is characterised in that the calculating obtains channel cross-correlation time interval for τi
The average R of Shi Xindao cross correlation valuesi, and autocorrelation value average AiSpecifically,
The average R of the cross correlation valueiFor,
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Wherein h*Represent plural number h conjugation；For the corresponding channel frequency domain response of k-th of subcarrier of i-th of ofdm symbol, N is
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6. a kind of Adaptive Transmission system, it is characterised in that including,
Auto-adaptive parameter constructing module, it is adaptive for the down converted frequencies according to reception system and pilot data interval time construction
Should be tested the speed parameterWherein T is constructs corresponding the under each channel cross-correlation time interval
During one class Oth order Bessel function, it is determined that the outer corresponding maximal function value of first monotony interval of each curve；It is letter
The cross-correlation time interval in road is τiWhen, the upper limit of effective speed can be estimated；
Adaptive speed measuring module, for selecting m ternary real number from the adaptive parameter that tests the speed according to practical application factor
Group, according to selected ternary real number group, calculating obtains channel cross-correlation time interval for τiThe average of Shi Xindao cross correlation values
Ri, and autocorrelation value average Ai；According to Ri/AiWhether speed class that T judge mobile terminal is more than；
Adaptive Transmission module, for carrying out Adaptive Transmission according to the speed of mobile terminal grade.
7. system according to claim 6, it is characterised in that the auto-adaptive parameter constructing module is according to reception system
Down converted frequencies and pilot symbol interval time construction adaptively test the speed parameterSpecifically,
The down converted frequencies of reception system are obtained, while obtaining pilot data time interval, institute according to the frame structure for receiving data
Pilot data time interval is stated as channel cross-correlation time interval；
According to the down converted frequencies of acquisition, corresponding first kind zeroth order under each described channel cross-correlation time interval is obtained
Bessel functions with velocity variations curve；
Determine outside first monotony interval of each curve, corresponding maximal function value T；
Maximal function value T is intersected as decision threshold with each curve in first monotony interval, a ternary real number is constituted
The set of group (Ω, T, τ), is the parameter that adaptively tests the speedWherein Ω is the horizontal seat of intersection point
Mark, τ is the corresponding channel cross-correlation time interval of curve where intersection point.
8. system according to claim 7, it is characterised in that the adaptive speed measuring module is used for from the adaptive survey
When m ternary real number group of selection is 2 in fast parameter, according to selected ternary real number group, when calculating obtains channel cross-correlation
Between at intervals of τiThe average R of Shi Xindao cross correlation valuesi, and autocorrelation value average Ai；According to Ri/AiWhether it is more than T and judges movement
The speed class of terminal specifically,
Choose two ternary real number group (Ω1,T,τ1) and (Ω2,T,τ2), wherein Ω1It is also channel cross-correlation for the upper limit of low speed
Time interval is τ1When effective estimating speed the upper limit；Ω2It is also that channel cross-correlation time interval is τ for the upper limit of middling speed2
When effective estimating speed the upper limit, wherein τ1>τ2；
Frequency pilot sign is chosen in data are received and is mutually divided into τ1And τ2The corresponding channel impulse response value of frequency pilot sign carry out respectively
Storage；
According to the channel impulse response value of storage, it is τ to calculate channel cross-correlation time interval1The average R of Shi Xindao cross correlation values1
With the average A of autocorrelation value1；And channel cross-correlation time interval is τ2When, the average R of channel cross correlation value2And autocorrelation value
Average A2；
Judge R1/A1Whether T is more than, if so, the speed for being judged as tested mobile terminal is low speed；Otherwise, R is judged2/A2It is whether big
In T, if so, the speed of mobile terminal is middling speed, otherwise at a high speed.
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| CN102123127A (en) * | 2010-12-31 | 2011-07-13 | 意法·爱立信半导体（北京）有限公司 | Coefficient calculation method and coefficient calculation device of time-domain channel estimation filter |
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| CN101917363A (en) * | 2010-08-10 | 2010-12-15 | 上海华为技术有限公司 | Method and device for estimating Doppler frequency shift |
| CN102123127A (en) * | 2010-12-31 | 2011-07-13 | 意法·爱立信半导体（北京）有限公司 | Coefficient calculation method and coefficient calculation device of time-domain channel estimation filter |
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