CN101437243A - Method and apparatus for measuring motion velocity of mobile station - Google Patents
Method and apparatus for measuring motion velocity of mobile station Download PDFInfo
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Abstract
The invention provides a method for measuring the moving speed of a mobile station, which is characterized by determining corresponding relation between correlated included angle values of channel vectors and the moving speed of the mobile station at each set time interval, subsequently, the method also comprises: A, obtaining a channel information evaluation values of pilot subcarriers in a downlink subframe and calculating the correlated included angle value of the channel vectors corresponding to the pilot subcarriers of a selected row in the corresponding time interval; and B, determining the moving speed of the mobile station according to calculating results and the corresponding relation. The invention simultaneously provides a device for measuring the moving speed of the mobile station. The method and the device can simply and efficiently measure the moving speed of the mobile station.
Description
Technical field
The present invention relates to the motion velocity of mobile station measuring technique, relate in particular to a kind of method and apparatus of measuring motion velocity of mobile station.
Background technology
In mobile communication system, the motion of travelling carriage causes the variation of Doppler frequency shift and channel quality, technology such as channel estimating in the mobile communication system and link circuit self-adapting are proposed very high requirement, therefore, in mobile communication system, need to measure the movement velocity of travelling carriage, to carry out the switching of mode of operation at different motion speed.
Because the motion of travelling carriage, the variation of phase place and amplitude can take place in the signal that send the base station that travelling carriage receives, and therefore, can utilize the variation of described measure of the change motion velocity of mobile station.Measurement at motion velocity of mobile station, had a lot of companies and research institution to carry out extensive studies at present, method of measurement mainly contains two big classes: a class is to utilize the frequency that changes with the mobile station signal best cell and mobile station speed correlation to adjudicate the movement velocity of travelling carriage; Another kind of is that utilization receives the time domain of signal or the correlation of frequency domain variation characteristic and Doppler frequency shift is obtained Doppler frequency shift, and then obtains the movement velocity of travelling carriage.Introduce two class method of measurement below in detail:
The first kind, the signal quality measured method of best cell.
If the movement velocity of travelling carriage is very fast, will inevitably carry out the switching of neighbor cell, therefore, the switch instances by the record travelling carriage can obtain the pairing movement velocity of travelling carriage.But, in the mobile communication system that adopts layered cell structure, be the movement velocity of travelling carriage to be judged, rather than the movement velocity of travelling carriage judged according to the switching times of reality according to the change frequency of the best microcell base station of the measured signal quality of travelling carriage in the unit interval.Therefore, in concrete measuring process, need preestablish the thresholding of the pairing change frequency of each speed, the movement velocity that can judge travelling carriage by the change frequency and the threshold value of the top-quality microcell base station of comparison signal.
This method need be utilized high-rise indication information, monitor the signal quality of a plurality of sub-districts simultaneously, the situation of change of the adjacent Microcell that the real time record signal quality is best, implementation procedure is complicated, and, because the sub-district switches the general experience long period, therefore, the cycle of measuring movement velocity is longer.
Second class is according to the method for measurement of received signal variation.
The motion of travelling carriage causes the variation of channel information, and then causes that the amplitude of received signal and channel information and phase place change, and utilizes described variation characteristic can obtain the variation of motion velocity of mobile station.Commonly used have following two kinds of methods:
A, zero passage method of measurement first:
Zero passage measurement first is the relation of utilizing between the Doppler frequency shift that relevant statistical property of channel and travelling carriage motion cause, and estimates the movement velocity of travelling carriage.
According to classical statistical theory, the time domain correlation properties of channel information satisfy following formula:
Wherein, τ express time interval, f
dThe expression maximum doppler frequency, J
0() expression first kind zero Bessel function,
The expression noise power spectral density.
Bessel function J
0(x) the x value during zero crossing is fixed value: x=2.405 first.If select the suitable τ can be so that J
0(x) equal zero, then can obtain maximum doppler frequency:
Therefore, by calculating
Can calculate maximum Doppler frequency shift, and then measure the movement velocity of travelling carriage.
The above-mentioned method of measurement of zero passage first need at first obtain correct mobile channel time domain impulse response information, so, to having relatively high expectations that mobile channel is estimated, it is bigger that its estimated accuracy is influenced by the mobile channel estimated result, and, in order to find first zero point, time interval τ chosen the comparison sensitivity, when movement velocity not simultaneously, the τ value during zero passage changes, and has increased the complexity of system.
B, Doppler's power spectrum measurement method:
For Doppler's power spectrum characteristic of mobile channel, suppose usually that in theory it satisfies classical Doppler's Power Spectrum Distribution figure as shown in Figure 1, maximum Doppler frequency shift-Fd and Fd are in the both sides of the longitudinal axis.Therefore, can utilize the maximum doppler frequency of Doppler's power spectrum estimation mobile channel of mobile channel, and then obtain the movement velocity of travelling carriage.
In the method, at first obtain the mobile channel parameter of time domain, then it is carried out Fourier transform, obtain Doppler's power spectrum of mobile channel, afterwards, seek the catastrophe point on the described power spectrum, try to achieve maximum Doppler frequency shift, and then obtain the movement velocity of travelling carriage.
Above-mentioned multispectral prerequisite of reining in the power spectrum measurement method is: Doppler's power spectrum of supposing movable signal satisfies classical Doppler's Power Spectrum Distribution figure, and under actual conditions, Doppler's power spectrum of mobile channel and classical Doppler's Power Spectrum Distribution figure have very big gap, the maximum doppler frequency of catastrophe point in the power spectrum and reality is also unequal, so measure error is bigger; Simultaneously, the pilot tone spacing must satisfy the requirement of the minimum sample rate of Doppler frequency spectrum.
By above introduction for motion velocity of mobile station method of measurement in the prior art as can be known, the implementation procedure of existing method of measurement is all comparatively complicated, is difficult for realizing.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and apparatus of measuring motion velocity of mobile station, can be simply, effectively the movement velocity of travelling carriage is measured.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of method of measuring motion velocity of mobile station, determine in the setting-up time interval, the relevant angle value of channel vector and the corresponding relation of motion velocity of mobile station, this method also comprises:
A, obtain the channel information estimated value of pilot sub-carrier in the descending sub frame, the pilot sub-carrier that calculates select column respectively in its pairing time interval, the relevant angle value of corresponding channel vector;
B, according to result of calculation and corresponding corresponding relation thereof, determine the movement velocity of travelling carriage.
Wherein, during only selected two row pilot sub-carriers, determine described in the step B that the movement velocity of travelling carriage is in each descending sub frame: the movement velocity of directly determining travelling carriage according to result of calculation and corresponding corresponding relation thereof;
During the above pilot sub-carrier of selected two row, determine described in the step B that the movement velocity of travelling carriage is: determine the movement velocity of the pairing travelling carriage of each result of calculation earlier, calculate final motion velocity of mobile station afterwards again in each descending sub frame.
Described definite corresponding relation is specially: estimate to determine described corresponding relation according to actual transmissions environment or emulation.
Described result of calculation is relevant angle value described in the steps A.
Further comprise between steps A and the step B:
A1, add up in some descending sub frames continuously, the relevant angle value of the pilot sub-carrier pairing channel vector identical with the moment of each pilot sub-carrier in the steps A and the pairing time interval thereof, and the relevant angle value by obtaining, the corresponding respectively relevant angle average of calculating in each time interval;
Accordingly, described result of calculation is relevant angle average.
Further comprise between steps A 1 and the step B:
A2, reject in the relevant angle value with after its corresponding relevant angle average departs from the relevant angle value of certain ratio respectively, recomputate each new relevant angle average respectively;
Accordingly, described result of calculation is described new relevant angle average.
Described corresponding channel vector is: the pairing channel vector of pairing two row pilot sub-carriers of each time interval.
The present invention provides a kind of device of measuring motion velocity of mobile station simultaneously, and this device comprises: corresponding relation obtains module, relevant angle mean value computation module and movement velocity determination module, wherein,
Corresponding relation obtains module, is used for determining the relevant angle value of the at interval interior channel vector of each setting-up time and the corresponding relation of motion velocity of mobile station, and the corresponding relation of determining is sent to the movement velocity determination module;
Relevant angle mean value computation module is used for obtaining the channel information estimated value of each descending sub frame pilot sub-carrier, according to the relevant angle value of described estimated value calculating channel vector, and result of calculation is sent to the movement velocity determination module;
The movement velocity determination module is used for determining the movement velocity of travelling carriage according to the corresponding relation that receives obtains module and the angle mean value computation module of being correlated with is sent respectively described corresponding relation and result of calculation.
Wherein, described result of calculation is: relevant angle value.
Relevant angle mean value computation module is further used for: add up the relevant accordingly angle value of some descending sub frames continuously, and calculate relevant angle average by the described relevant angle value that obtains;
Accordingly, described result of calculation is: relevant angle average.
Relevant angle mean value computation module is further used for: after rejecting the relevant angle value of the relevant angle average certain ratio that departs from its correspondence in the relevant angle value respectively, recomputate each new relevant angle average respectively;
Accordingly, described result of calculation is: new relevant angle average.
The method and apparatus of measurement motion velocity of mobile station provided by the present invention, utilize the pilot sub-carrier calculating channel information estimated value in the descending sub frame, the movement velocity of the travelling carriage of the relevant angle value of calculating channel vector, and then acquisition afterwards, realize simply need not complicated soft hardware equipment.The present invention is the relevant accordingly angle value of a plurality of descending sub frames of statistics continuously, perhaps calculate the pairing relevant angle value of multiple row pilot sub-carrier in each descending sub frame, the calculating of the line correlation angle average of going forward side by side has increased objectivity, the reliability of measuring motion velocity of mobile station.The present invention can reject departing from the relevant bigger relevant angle value of angle average after calculating relevant angle average, recomputates relevant angle average again, so, can further strengthen the motion velocity of mobile station measuring reliability.
Description of drawings
Fig. 1 is classical Doppler's Power Spectrum Distribution figure;
Fig. 2 uses the method flow schematic diagram of two row pilot signal measurement motion velocity of mobile station for the present invention;
Fig. 3 is motion velocity of mobile station and the corresponding curve synoptic diagram of relevant angle value;
Fig. 4 uses the method flow schematic diagram of multiple row pilot signal measurement motion velocity of mobile station for the present invention;
Fig. 5 measures the apparatus structure schematic diagram of motion velocity of mobile station for the present invention.
Embodiment
Basic thought of the present invention is: calculate in the descending sub frame the relevant angle value of certain hour two channel vectors at interval on the pilot sub-carrier, determine the movement velocity of travelling carriage by described relevant angle value.
Basic principle of the present invention is:
In OFDM (OFDM) system, the correlation function of a certain pilot sub-carrier upper signal channel value of information can be expressed as:
Wherein, f
dBe maximum doppler frequency skew, J
0() is first kind zero Bessel function.
Channel information estimated value for reality often contain noise signal, so following formula can be written as:
Wherein,
Be noise power spectral density, H is the channel information value, and k is the k moment, and τ is the time interval, f
dBe maximum doppler frequency, J
0() is first kind zero Bessel function,
Be noise power spectral density.
In order to overcome The noise, can use the mean value of the relevant angle value of k and k+ τ two moment channel vector smoothly to compensate.If the channel information value at adjacent pilot symbols place the time interval more in short-term, its angle is f
dWith the function of pilot tone time interval τ, and linear, then can obtain the Doppler frequency shift of travelling carriage, and then obtain the movement velocity of travelling carriage by asking relevant angle value.The expression of its angle is as follows:
If restriction f
dThe value of * τ makes relevant angle value in the scope of [0, π], wherein, in actual mobile communication system, be easy to satisfy above-mentioned condition, then can utilize the accumulation average of relevant angle value to judge the size of Doppler frequency shift, and then obtain the movement velocity of travelling carriage.
Below be described with reference to the accompanying drawings by specific embodiment.
Fig. 2 uses the method flow schematic diagram of two row pilot signal measurement motion velocity of mobile station for the present invention, and as shown in Figure 2, this method comprises:
Step 201: estimate according to actual transmissions environment or emulation, obtain under a certain Fixed Time Interval τ the relevant angle value of channel vector and the corresponding relation of motion velocity of mobile station.
Wherein, time interval τ can be selected according to the needs of certainty of measurement, without limits, still, sometime at interval during τ, promptly uses time interval τ selected in this step when selected in the following steps, can not change.
Wherein, for choosing of time interval τ, also can select two row pilot sub-carriers earlier, obtain time interval τ afterwards, at this moment, k in step 203 and k+ τ are pairing two moment of pilot sub-carrier selected in this step.
For example, in 3GPP Long Term Evolution (LTE) time division duplex (TDD) Type2 system, suppose that channel model is global system for mobile communications (GSM) TU channel, each subframe is 5ms, contain 7 time slots in each subframe, have only a time slot to be used for down channel in the subframe, the down public guide frequency frequency domain has two row OFDM symbols to have frequency pilot sign to insert, six OFDM symbols of frequency pilot sign time domain interval, signal to noise ratio 10dB.So, earlier, obtain as shown in Figure 3 motion velocity of mobile station and the corresponding curve chart of relevant angle value, obtain the corresponding relation of the motion velocity of mobile station shown in the table 1 and relevant angle value again according to Fig. 3 by the emulation statistics:
| Angle (degree) | [0-26] | [26-42] | [42-80] |
| Speed (km/hour) | Low speed (0-125) | Middling speed (75-230) | (170-400) at a high speed |
Table 1
Below just provided the example of LTETDD Type2 system, the method for the invention and device have more than and are limited to LTE TDD Type2 system, and it can be applied in TDD and Frequency Division Duplexing (FDD) (FDD) system.
Wherein, specifically how to estimate, obtain described motion velocity of mobile station and belong to known technology, repeat no more here with the corresponding relation of relevant angle value according to actual transmissions environment or emulation.
Step 202: the channel information estimated value that obtains pilot sub-carrier in the descending sub frame.
Here, the signal value of the pilot sub-carrier that is obtained can be expressed as:
Y＝Hx+n
Wherein, H is the channel information value, the frequency pilot sign value of x for sending, and n is a noise.
In descending sub frame,,, can obtain the channel information estimated value of pilot sub-carrier divided by pilot symbol transmitted x with pilot subcarrier signals value Y
Wherein, ignored the influence of noise n.
Step 203: according to the channel information estimated value of acquisition, getting is k constantly, time interval τ, the relevant angle value of the k of then calculating correspondence and k+ τ two moment pilot sub-carrier upper signal channel vector.
Wherein, channel vector is corresponding to described channel information estimated value.Relevant angle value is meant: the relevant angle value between the channel vector the when channel vector during constantly for k is k+ τ with the moment.
The relevant angle value of two channel vectors is calculated according to following formula:
Wherein, τ is the time interval, and k represents that k constantly.
Do not have certain restriction for choosing of moment k, can arbitrarily choose, but in case selected a certain moment k, when then carrying out the choosing of pilot sub-carrier in the next frame in the step 204, must choose the pilot sub-carrier of identical moment k yet.
Step 204: add up the relevant accordingly angle value of a plurality of descending sub frames continuously, calculate relevant angle average according to a plurality of relevant angle value that obtains.
Processing for the relevant angle value of adding up, several different methods can be arranged, for example: the relevant angle value of statistics before the relevant angle value part of current statistics can being covered, be exactly specifically, set the be correlated with calculating of angle average of the relevant accordingly angle value of each statistics 100 frames, when having added up the relevant accordingly angle value of 100 frames, calculate its relevant angle average, and when having added up 150 frames, calculate relevant angle average if desired, the corresponding part correlation angle of 0～100 frame value of statistics before then the relevant accordingly angle value of 100 frames～150 frames being covered, thus the be correlated with calculating of angle average of the relevant accordingly angle value of 100 frames still used; Perhaps, can only store the relevant accordingly angle value of 100 frames, after new relevant angle value of every statistics, promptly dynamically update the relevant accordingly angle value of 100 frames of being stored; Perhaps, when the memory space of storing relevant angle value is very big, then can preserve the more relevant angle value of multiframe, add up the be correlated with needs of angle mean value computation of the relevant angle value of multiframe more thereby satisfy, such as the calculating of angle average of being correlated with of: the relevant angle value of adding up 100 frames at every turn, and the relevant angle value of being stored can be far longer than 100 frames, then once measure motion velocity of mobile station and need add up 200 frames or the relevant accordingly angle value of multiframe more at certain, during the calculating of the angle average of being correlated with, still can provide abundant relevant angle value.
Wherein, add up the relevant accordingly angle value of a plurality of descending sub frames execution in step 202～203 that promptly circulates continuously, every execution once obtains the relevant accordingly angle value of a descending sub frame; Afterwards, according to the be correlated with calculating of angle average of the pairing relevant angle value of a plurality of descending sub frames of statistics.
Wherein, the quantity of the relevant angle value of the angle mean value computation of specifically need being correlated with depends on the certainty of measurement of actual needs and the signal to noise ratio of current received signal, and the quantity of the relevant angle value that need add up does not have the concrete upper limit.
In addition, used time interval τ was time interval τ selected in the step 201 during relevant angle value was calculated.
Step 205: reject departing from the relevant bigger relevant angle value of angle average, recomputate new relevant angle average then.
Wherein, depend on for the judgement of the data of required rejecting and for example, can be provided with the certainty of measurement of actual needs: reject and depart from the relevant angle value 20% or more of relevant angle average in relevant angle average.
Step 206:, determine the movement velocity of travelling carriage according to the new relevant angle average that obtains with reference to the corresponding relation shown in the table 1 that obtains.
The translational speed of described definite travelling carriage is specially: determine the described new relevant angle average that recomputates is in which angle interval in the corresponding relation, then the translational speed of travelling carriage is the interval pairing speed interval of this angle.
In the described motion velocity of mobile station computational process of Fig. 2, step 204,205 is optional step.
When removing step 204, step 205 must corresponding removing, and at this moment, in the step 206, determines the movement velocity of travelling carriage according to the relevant angle value of calculating in corresponding relation and the step 202.
When removing step 205, step 204 can keep, and at this moment, determines the movement velocity of travelling carriage in the step 206 according to the relevant angle average that calculates in corresponding relation and the step 204.
In the described motion velocity of mobile station computational process of Fig. 2, described relevant angle value, relevant angle average and the relevant angle average that recalculates can be referred to as result of calculation.
In addition, above-mentioned has provided the method flow of measuring a motion velocity of mobile station, when constantly carrying out the measurement of motion velocity of mobile station, only needs to return execution in step 202 and get final product after each execution of step 206, repeats no more here.
More than Figure 2 shows that the method flow schematic diagram that uses two row pilot signals to determine motion velocity of mobile station, further, in order to measure the movement velocity of travelling carriage more accurately, can use the multiple row pilot signal by finding the solution the relevant angle value of corresponding channel vector, and then obtain motion velocity of mobile station.Wherein, each corresponding row pilot sub-carrier of the moment.
When using the multiple row pilot signal to determine motion velocity of mobile station, promptly be in each descending sub frame, to calculate the multiple row pilot sub-carrier respectively in the time interval that it is set, the relevant angle value of institute's respective channels vector.Accordingly, on the basis of step 201～206, as shown in Figure 4, this use multiple row pilot channel determines that the method for motion velocity of mobile station comprises:
Step 401: estimate according to actual transmissions environment or emulation, obtain in time interval that per two row pilot sub-carriers are set the relevant angle value of channel vector and the corresponding relation of motion velocity of mobile station.
Per two row pilot sub-carriers all are set a time interval, and the time interval can be different, so need obtain in each time interval that is set the relevant angle value of channel vector and the corresponding relation of motion velocity of mobile station respectively.
The method that specifically obtains the corresponding relation in each time interval is identical with step 201.
Identical with step 201, also can select the pilot sub-carrier of certain row in this step earlier, calculate the time interval between per two pilot sub-carriers, the selected time interval of part or all conduct in the time interval of selecting afterwards to calculate, and determine pairing two row pilot sub-carriers of each chosen time interval.Wherein, when carrying out the choosing of the time interval, should choosing wherein, the numerical value in the time interval differs the bigger time interval.After the time interval, τ was chosen, its pairing pilot sub-carrier promptly was determined, and at this moment, needn't carry out the selected of pilot sub-carrier in the step 403, and the calculating of the angle value of directly being correlated with.
Step 402: identical with step 202.
Step 403: calculate the pilot sub-carrier in each chosen certain moment in the current descending sub frame respectively, and the pilot sub-carrier that is calculated is in the time interval that is set, the relevant angle value of pairing channel vector.
Wherein, the calculating of each relevant angle value is all identical with the computational methods of relevant angle value in the step 203.
Step 404: add up multiple row pilot sub-carrier in a plurality of descending sub frames and the corresponding relevant angle value in time interval of being set, afterwards, calculate in each time interval relevant accordingly angle average respectively.
Wherein, the computational methods of concrete statistical method and relevant angle average are all identical with step 204, and difference only is: need the relevant angle average of difference in a plurality of time intervals of double counting.
Step 405: respectively pairing relevant angle value in each time interval is correspondingly rejected, and recalculated pairing new relevant angle average of each time interval.
Wherein, elimination method, to recomputate the method for new relevant angle average identical with method in the step 205, and difference only is: need the corresponding new relevant angle average of a plurality of different times of double counting at interval.
Step 406: be foundation with pairing corresponding relation of each time interval respectively, determine the movement velocity of travelling carriage accordingly according to pairing new relevant angle average of each time interval.
Wherein, concrete processing method is identical with step 206, and difference only is: need repeat the new pairing speed interval of relevant angle average in definite each time interval.
Step 407:, calculate final motion velocity of mobile station according to the movement velocity of a plurality of travelling carriages that obtain in the step 406.
Because each new relevant angle average all can obtain a speed interval according to its corresponding corresponding relation, and described speed interval might not be identical, so need carry out certain processing to a plurality of speed intervals that obtain, thereby obtain the pairing speed interval of movement velocity of final travelling carriage.
Its concrete grammar can for: according to the speed interval of the correspondence of sequence arrangement from small to large in the time interval in the speed interval that obtains; Afterwards, carry out the crossing calculating of speed interval: relatively whether first speed interval and second speed interval have common factor, if do not occur simultaneously, then getting second speed interval is the effective speed interval, if common factor is arranged, the speed interval of then getting common factor is as the effective speed interval; Whether relatively effective speed is interval then has common factor with the third speed interval, if do not occur simultaneously, then getting third speed interval is the effective speed interval, if common factor is arranged, the speed interval of then getting common factor is as the effective speed interval, and use the interval judgment processing method of above-mentioned effective speed to carry out the processing of follow-up speed interval with the third speed interval, by that analogy, after speed interval to the last and effective speed interval are relatively intacter, obtain final effective speed interval, this final effective speed interval is the pairing speed interval of movement velocity of travelling carriage.
More than provided a kind of method that a plurality of speed intervals are handled, but be not limited to only adopt said method that speed interval is handled, in actual applications, also can carry out adaptations, perhaps use other processing method for the interval to above-mentioned processing method.
Wherein, same, step 404,405 is optional step.
When removing step 404, step 405 must corresponding removing, and at this moment, in the step 406, determines the movement velocity of travelling carriage according to the pairing relevant angle value of calculating in the corresponding relation in each time interval and the step 402 of each time interval.
When removing step 405, step 404 can keep, and at this moment, determines the movement velocity of travelling carriage in the step 406 according to the relevant angle average difference correspondence that calculates in corresponding relation and the step 404.
In the described motion velocity of mobile station computational process of Fig. 4, described relevant angle value, relevant angle average and new relevant angle average can be referred to as result of calculation.
Fig. 5 measures the apparatus structure schematic diagram of motion velocity of mobile station for the present invention, and as shown in Figure 5, this device comprises: corresponding relation obtains module 510, relevant angle mean value computation module 520 and movement velocity determination module 530, wherein,
Corresponding relation obtains module 510, is used for estimating according to actual transmissions environment or emulation, obtains the relevant angle value of channel vector and the corresponding relation of motion velocity of mobile station, and the corresponding relation that obtains is sent to movement velocity determination module 530.
When using the multiple row pilot signal, corresponding relation obtains module 510 need obtain the interior corresponding relation of a plurality of Fixed Time Intervals; When using two row pilot signals, corresponding relation obtains 510 need of module and obtains the interior corresponding relation of the time interval that this pilot signal is set.
Relevant angle mean value computation module 520, be used for obtaining the channel information estimated value on the descending sub frame pilot sub-carrier, and according to the relevant angle value of described estimated value calculating channel vector, after the relevant angle value of the descending sub frame that obtains some, calculate relevant angle average, and comparison each relevant angle value and its corresponding relevant angle average, rejecting departs from the relevant bigger relevant angle value of angle average, afterwards, the new relevant angle average that recalculates is sent to movement velocity determination module 530.
Wherein, when getting the multiple row pilot sub-carrier in each descending sub frame, the relevant angle value that calculates, relevant angle average and new relevant angle average are a plurality of, and the respectively corresponding per two row pilot sub-carrier and time intervals thereof.
Wherein, relevant angle mean value computation module 520 also can only calculate relevant angle value, and the angle value of directly will being correlated with sends to movement velocity determination module 530, and does not carry out the calculating of follow-up relevant angle average; Relevant angle mean value computation module 520 can also only calculate relevant angle average, and described relevant angle average is sent to movement velocity determination module 530, and does not carry out the follow-up step that relevant angle value is rejected and the angle average of being correlated with recomputates.
Here, relevant angle value, relevant angle average and new relevant angle average are referred to as result of calculation.
Movement velocity determination module 530 is used for determining the movement velocity of travelling carriage according to the corresponding relation that receives obtains module 510 and the angle mean value computation module 520 of being correlated with is sent respectively described corresponding relation and described result of calculation.
Wherein, when only selecting the pilot sub-carrier of two row in each descending sub frame, the movement velocity of described definite travelling carriage is: directly according to described result of calculation and described corresponding relation, obtain the movement velocity of travelling carriage; When selecting the multiple row pilot sub-carrier in each descending sub frame, the movement velocity of described definite travelling carriage is: at first according to each result of calculation and described corresponding relation, obtain the movement velocity of travelling carriage respectively; Because corresponding corresponding relation of each result of calculation, and then the movement velocity of a corresponding travelling carriage, so, obtain the movement velocity of travelling carriage respectively after, need calculate for the movement velocity of a plurality of travelling carriages that obtain, obtain the movement velocity of final travelling carriage.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (12)
1, a kind of method of measuring motion velocity of mobile station is characterized in that, determine in the setting-up time interval, and the relevant angle value of channel vector and the corresponding relation of motion velocity of mobile station, this method also comprises:
A, obtain the channel information estimated value of pilot sub-carrier in the descending sub frame, the pilot sub-carrier that calculates select column respectively in its pairing time interval, the relevant angle value of corresponding channel vector;
B, according to result of calculation and corresponding corresponding relation thereof, determine the movement velocity of travelling carriage.
2, the method for measurement motion velocity of mobile station according to claim 1, it is characterized in that, during only selected two row pilot sub-carriers, determine described in the step B that the movement velocity of travelling carriage is in each descending sub frame: the movement velocity of directly determining travelling carriage according to result of calculation and corresponding corresponding relation thereof;
During the above pilot sub-carrier of selected two row, determine described in the step B that the movement velocity of travelling carriage is: determine the movement velocity of the pairing travelling carriage of each result of calculation earlier, calculate final motion velocity of mobile station afterwards again in each descending sub frame.
3, the method for measurement motion velocity of mobile station according to claim 1 is characterized in that, described definite corresponding relation is specially: estimate to determine described corresponding relation according to actual transmissions environment or emulation.
According to the method for claim 1,2 or 3 described measurement motion velocity of mobile station, it is characterized in that 4, described result of calculation is relevant angle value described in the steps A.
5, according to the method for claim 1,2 or 3 described measurement motion velocity of mobile station, it is characterized in that, further comprise between steps A and the step B:
A1, add up in some descending sub frames continuously, the relevant angle value of the pilot sub-carrier pairing channel vector identical with the moment of each pilot sub-carrier in the steps A and the pairing time interval thereof, and the relevant angle value by obtaining, the corresponding respectively relevant angle average of calculating in each time interval;
Accordingly, described result of calculation is relevant angle average.
6, the method for measurement motion velocity of mobile station according to claim 5 is characterized in that, further comprises between steps A 1 and the step B:
A2, reject in the relevant angle value with after its corresponding relevant angle average departs from the relevant angle value of certain ratio respectively, recomputate each new relevant angle average respectively;
Accordingly, described result of calculation is described new relevant angle average.
According to the method for claim 1,2 or 3 described measurement motion velocity of mobile station, it is characterized in that 7, described corresponding channel vector is: the pairing channel vector of pairing two row pilot sub-carriers of each time interval.
8, a kind of device of measuring motion velocity of mobile station is characterized in that, this device comprises: corresponding relation obtains module, relevant angle mean value computation module and movement velocity determination module, wherein,
Corresponding relation obtains module, is used for determining the relevant angle value of the at interval interior channel vector of each setting-up time and the corresponding relation of motion velocity of mobile station, and the corresponding relation of determining is sent to the movement velocity determination module;
Relevant angle mean value computation module is used for obtaining the channel information estimated value of each descending sub frame pilot sub-carrier, according to the relevant angle value of described estimated value calculating channel vector, and result of calculation is sent to the movement velocity determination module;
The movement velocity determination module is used for determining the movement velocity of travelling carriage according to the corresponding relation that receives obtains module and the angle mean value computation module of being correlated with is sent respectively described corresponding relation and result of calculation.
9, the device of measurement motion velocity of mobile station according to claim 8 is characterized in that, described result of calculation is: relevant angle value.
10, the device of measurement motion velocity of mobile station according to claim 8, it is characterized in that, relevant angle mean value computation module is further used for: add up the relevant accordingly angle value of some descending sub frames continuously, and calculate relevant angle average by the described relevant angle value that obtains;
Accordingly, described result of calculation is: relevant angle average.
11, the device of measurement motion velocity of mobile station according to claim 10, it is characterized in that, relevant angle mean value computation module is further used for: after rejecting the relevant angle value of the relevant angle average certain ratio that departs from its correspondence in the relevant angle value respectively, recomputate each new relevant angle average respectively;
Accordingly, described result of calculation is: new relevant angle average.
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