CN102916734B - Antenna selection method and antenna selection device of distributed antenna system - Google Patents
Antenna selection method and antenna selection device of distributed antenna system Download PDFInfo
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- CN102916734B CN102916734B CN201210425268.0A CN201210425268A CN102916734B CN 102916734 B CN102916734 B CN 102916734B CN 201210425268 A CN201210425268 A CN 201210425268A CN 102916734 B CN102916734 B CN 102916734B
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Abstract
The invention discloses an antenna selection method and an antenna selection device of a distributed antenna system. The antenna selection method and the antenna selection device are applied to an antenna set to be selected in a preset communication zone, and the antenna set to be selected comprises at least two antennas. The method includes: acquiring timing capture inspection amount of a mobile terminal at a preset terminal position point in the communication zone with each antenna; determining a maximum value of the timing capture inspection amount of the mobile terminal with each antenna, and generating a maximum inspection amount set when the mobile terminal is positioned at the terminal position point; acquiring the number of elements of the maximum inspection amount set, and computing collaborative thresholds of the antennas corresponding to the number of the elements according to the number of the elements; and judging whether each element in the maximum inspection amount set is larger than or equal to the collaborative threshold of the antenna corresponding to the element or not, and if yes, selecting the antennas corresponding to the elements in the maximum inspection amount set as target antennas.
Description
Technical field
The application relates to the communications field, particularly a kind of antenna selecting method of distributing antenna system and device.
Background technology
Distributing antenna system is for such as reducing outage probability, saving transmitting power and increase the feature such as power system capacity, is the part in the 4th generation wireless communication system.For effectively using the distributed day antenna resource in system, improve the availability of frequency spectrum of system, generally adopt many antennas collaborative signal processing technology.But, in distributing antenna system, antenna in communication zone is generally at random to be put, thereby make directly to affect for the selection of the target antenna of mobile terminal service the performance of distributing antenna system, thereby how to carry out day line options in antenna set to be selected is the problem that distributing antenna system is needed solution badly.
Current antenna selecting plan is generally: suppose precise synchronization of time and frequency, timing acquisition process completes (signal that the antenna in antenna set to be selected all can capture mobile terminal transmitting), according to the radio channel state of each antenna, while ensureing that mobile terminal moves at random in communication zone, in the situation of channel capacity maximum or average error rate minimum, selection can reduce the quantity of radio frequency unit and can improve the antenna of spatial correlation.
But such scheme is in the time of practical application, the impossible precise synchronization of time and frequency, and distributing antenna system only has part antenna can capture the signal of mobile terminal transmitting conventionally, thus, scheme assumed conditions of the prior art is too desirable, make the antenna of choosing can not meet Practical Project demand, obviously reduce accuracy and the validity of day line options.
Summary of the invention
In view of this, the application provides a kind of antenna selecting method and device of distributing antenna system, assumed conditions while carrying out target antenna selection in order to solve prior art in distributing antenna system is too desirable, make the antenna of choosing can not meet Practical Project demand, obviously reduce day accuracy of line options and the technical problem of validity.
For solving the problems of the technologies described above, the application provides a kind of antenna selecting method of distributing antenna system, is applied to the antenna set to be selected that is arranged at default communication zone, and described antenna set to be selected comprises at least two antennas, and described method comprises:
Obtain respectively the default mobile terminal of terminal location point and the timing acquisition inspected number of each described antenna in described communication zone;
Determine the maximum of the timing acquisition inspected number of described mobile terminal and each described antenna, generate the maximum inspected number set of described mobile terminal in described terminal location point;
Obtain the element number of described maximum inspected number set, calculate the collaborative threshold value of the antenna corresponding with this element number according to described element number;
Judge that whether each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, if so, chooses the antenna corresponding with each element in this maximum inspected number set as target antenna.
Said method, preferred, the described mobile terminal of default terminal location point and the timing acquisition inspected number of each described antenna of obtaining respectively in default communication zone comprises:
Obtain respectively the sequence that described mobile terminal that each described antenna reception arrives sends, as receiving sequence;
Determine the correlation function of the receiving sequence obtained and default training sequence;
To described correlation function delivery side, obtain timing acquisition inspected number.
Said method, preferred, if each element is not all more than or equal to the collaborative threshold value of the antenna corresponding with this element in described maximum inspected number set, described method also comprises:
Delete the element of numerical value minimum in described maximum inspected number set;
Whether the maximum inspected number set that judges deletion element is empty, if, finish current day line options, otherwise, described in returning, obtain the element number of described maximum inspected number set, until each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element.
Said method, preferred, the collaborative threshold value that the described element number of described foundation calculates the antenna corresponding with this element number comprises:
Utilize
calculate the collaborative threshold value of the corresponding antenna of the element number of described maximum inspected number set;
Wherein, T
mfor the collaborative threshold value of the corresponding antenna of the element number of described maximum inspected number set, m=1,2 ..., M, M is the antenna amount in described antenna set to be selected, P
ffor default pre-alarm probability,
be the variance of the default timing acquisition inspected number of m root antenna, M
cfor the element number in described maximum inspected number set.
The application also provides a kind of antenna selection apparatus of distributing antenna system, is applied to the antenna set to be selected that is arranged at default communication zone, and described antenna set to be selected comprises at least two antennas, and described device comprises:
Inspected number acquiring unit, for obtaining respectively the mobile terminal of default terminal location point and the timing acquisition inspected number of each described antenna in the default comunication area;
Maximum determining unit, for determining the maximum of timing acquisition amount of described mobile terminal and each described antenna, generates the maximum inspected number set of described mobile terminal in described terminal location point;
Threshold calculations unit, for obtaining the element number of described maximum inspected number set, calculates the collaborative threshold value of the antenna corresponding with this element number according to described element number;
The first identifying unit, for judging whether described maximum each element of inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, if so, chooses the antenna corresponding with each element in this maximum inspected number set as target antenna.
Said apparatus, preferred, described inspected number acquiring unit comprises:
Retrieval subelement, the sequence sending for obtaining respectively described mobile terminal that each described antenna reception arrives, as receiving sequence;
Inspected number is obtained subelement, for determining the correlation function of the receiving sequence obtained and default training sequence, and to described correlation function delivery side, obtains timing acquisition inspected number.
Said apparatus, preferred, also comprise:
The second identifying unit, if be not all more than or equal to the collaborative threshold value of the antenna corresponding with this element for described maximum each element of inspected number set, delete the element of numerical value minimum in described maximum inspected number set, and whether the maximum inspected number set that judges deletion element is empty, if, finish current day line options, otherwise, trigger described threshold calculations unit, until each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element.
Said apparatus, preferred, described threshold calculations unit specifically for:
Utilize
calculate the collaborative threshold value of the corresponding antenna of the element number of described maximum inspected number set;
Wherein, Tm
forthe collaborative threshold value of the corresponding antenna of the element number of described maximum inspected number set, m=1,2 ..., M, M is the antenna amount in described antenna set to be selected, P
ffor default pre-alarm probability,
be the variance of the default timing acquisition inspected number of m root antenna, MC is the element number in described maximum inspected number set.
From such scheme, the antenna selecting method of a kind of distributing antenna system that the application provides and device, by obtaining respectively the default mobile terminal of terminal location point and the timing acquisition inspected number of each described antenna in described communication zone, determine the maximum of the timing acquisition inspected number of described mobile terminal and each described antenna, generate the maximum inspected number set of described mobile terminal in described terminal location point, obtain the element number of described maximum inspected number set, calculate the collaborative threshold value of the antenna corresponding with this element number according to described element number, and judge whether each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, if, choose the antenna corresponding with each element in this maximum inspected number set as target antenna, thereby realize the selection of the work antenna of mobile terminal in distributing antenna system.With respect to prior art supposition temporal frequency precise synchronization, timing acquisition process completes, the technical scheme that the application provides is carried out a day line options in the timing acquisition stage, obtain by the timing acquisition inspected number between mobile terminal and antenna in communication zone, and then work antenna in definite practical communication region is as target antenna, make the antenna of choosing can meet Practical Project demand, obviously improved accuracy and the validity of day line options.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present application, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiment of the application, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The flow chart of the antenna selecting method of a kind of distributing antenna system that Fig. 1 provides for the embodiment of the present application one;
Fig. 2 is communication zone in the embodiment of the present application one and the schematic diagram of antenna set to be selected;
The flow chart of the antenna selecting method of a kind of distributing antenna system that Fig. 3 provides for the embodiment of the present application two;
The part flow chart of the antenna selecting method of a kind of distributing antenna system that Fig. 4 provides for the embodiment of the present application three;
Fig. 5 is the structural representation that in the embodiment of the present application three, mobile terminal sends sequence;
The structural representation of the antenna selection apparatus of a kind of distributing antenna system that Fig. 6 provides for the embodiment of the present application four;
The structural representation of the antenna selection apparatus of a kind of distributing antenna system that Fig. 7 provides for the embodiment of the present application five;
The structural representation of the antenna selection apparatus of a kind of distributing antenna system that Fig. 8 provides for the embodiment of the present application six;
Another structural representation of the antenna selection apparatus of a kind of distributing antenna system that Fig. 9 provides for the embodiment of the present application six.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiment.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.
With reference to figure 1, it shows the flow chart of the antenna selecting method of a kind of distributing antenna system that the embodiment of the present application one provides, described method is applied to the antenna set to be selected that is arranged at default communication zone, described antenna set to be selected comprises at least two antennas, and described method can comprise the following steps:
Step 101: the timing acquisition inspected number of obtaining respectively mobile terminal and each described antenna of the default terminal location point in described communication zone;
Wherein, described terminal location point is for setting in advance in described communication zone, and the position of the described mobile terminal of described terminal location point general reference in communication zone, be not limited in described communication zone certain a bit.
It should be noted that, described communication zone refers to: Zone Full or subregion that in the antenna set to be selected in distributing antenna system, all antennas cover, for example: antenna set to be selected comprises three antennas, described three antennas cover region " Tian'anmen Square " completely, now select this region " Tian'anmen Square " as described communication zone.For example, with reference to figure 2, it shows the application's communication zone and the schematic diagram of antenna set to be selected, wherein, three stains shown in figure represent three antennas in described antenna set to be selected, and three circles shown in figure are respectively the covering circle that the covering radius of three antennas forms.
Step 102: determine the maximum of the timing acquisition inspected number of described mobile terminal and each described antenna, generate the maximum inspected number set of described mobile terminal in described terminal location point.
For example: in described step 101, obtain mobile terminal in mobile terminal point with in coordinate (x
i, y
i) i root antenna timing acquisition inspected number be | Corr
i(d) |
2, wherein, i=1,2 ..., N, N is the number of antenna in described antenna set to be selected, d=1,2 ..., D, D is that described i root antenna reception is to the length of sequence of described mobile terminal transmission and the difference of the length of default training sequence.
Suppose, N is 3, and the timing acquisition inspected number of the mobile terminal in described terminal location point and each described antenna is respectively so: | Corr
1(d) |
2, | Corr
2(d) |
2, | Corr
3(d) |
2in described step 102, generate described mobile terminal and be the set of the maximum composition extracting in inspected number sequence in the maximum inspected number set of described shift position point in above-mentioned 3 timing acquisition inspecteds number, if above-mentioned 3 timing acquisition inspected number sequence maximums are respectively: 6,6,4, thus, the maximum inspected number set of described mobile terminal is: { 6,6,4}.
Step 103: obtain the element number of described maximum inspected number set, calculate the collaborative threshold value of the antenna corresponding with this element number according to described element number;
Step 104: judge whether each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, if so, execution step 105, if not, does not deal with.
Step 105: choose the antenna corresponding with each element in this maximum inspected number set as target antenna.
It should be noted that, in above-mentioned steps 104, " if not, not dealing with " is in order to be convenient at picture, might not deal with, and can be other situations.For example, when each element is not all more than or equal to the collaborative threshold value of the antenna corresponding with this element in described maximum inspected number set, described maximum inspected number set is done to other and process, the antenna in described antenna set to be selected is selected.
Wherein, if each element is all more than or equal to the collaborative threshold value of the antenna corresponding with this element in described maximum inspected number set, illustrate that the antenna that in this maximum inspected number set, each element is corresponding all can capture the signal of launching when mobile terminal is positioned at described terminal location point, show that thus this antenna can be used as target antenna, thereby, choose antenna that this each element of maximum inspected number set is corresponding as target antenna.
For example: the collaborative threshold value of the antenna that in described maximum inspected number set, each element is corresponding is 4, in so described maximum inspected number set, each element is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, illustrate that the antenna that in this maximum inspected number set, each element is corresponding all can capture the signal of launching when mobile terminal is positioned at all terminal location points, show that thus this antenna can be used as target antenna, thereby, choose antenna that this each element of maximum inspected number set is corresponding as target antenna.
From such scheme, the antenna selecting method of a kind of distributing antenna system that the embodiment of the present application one provides, by obtaining respectively the default mobile terminal of terminal location point and the timing acquisition inspected number of each described antenna in described communication zone, determine the maximum of the timing acquisition inspected number of described mobile terminal and each described antenna, generate the maximum inspected number set of described mobile terminal in described terminal location point, obtain the element number of described maximum inspected number set, calculate the collaborative threshold value of the antenna corresponding with this element number according to described element number, and judge whether each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, if, choose the antenna corresponding with each element in this maximum inspected number set as target antenna, thereby realize the selection of the antenna of working in distributing antenna system, with respect to prior art supposition temporal frequency precise synchronization, timing acquisition process completes, the technical scheme that the embodiment of the present application provides is carried out a day line options in the timing acquisition stage, obtain by the timing acquisition inspected number between mobile terminal and antenna in communication zone, and then work antenna in definite practical communication region is as target antenna, make the antenna of choosing can meet Practical Project demand, accuracy and the validity of day line options are obviously improved.
Preferably, with reference to figure 3, it shows the flow chart of the antenna selecting method of a kind of distributing antenna system that the embodiment of the present application two provides, wherein, if each element is not all more than or equal to the collaborative threshold value of the antenna corresponding with this element in described maximum inspected number set, described method is further comprising the steps of:
Step S106: the element of deleting numerical value minimum in described maximum inspected number set.
Wherein, if each element in described maximum inspected number set is not the collaborative threshold value that is all more than or equal to the antenna that this element is corresponding, when judging thus described mobile terminal and being positioned at current terminal location point, antenna in described antenna set to be selected can not all capture transmitting of described mobile terminal, thus the element of numerical value minimum in described maximum inspected number set is deleted, deleted by the antenna transmitting that cannot capture described mobile terminal in described antenna set to be selected.
Step S107: whether the maximum inspected number set that judges deletion element is empty, if so, execution step S108, otherwise, return to described step 103, until each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element.
Step S108: finish current day line options.
Suppose, the antenna number in described antenna set to be selected is 3, and the timing acquisition amount of so described mobile terminal and each described antenna is respectively: | Corr
1(d) |
2, | Corr
2(d) |
2, | Corr
3(d) |
2, the maximum inspected number set now generating is the set of the maximum composition extracting in above-mentioned 3 timing acquisition inspecteds number in inspected number sequence, if above-mentioned 3 timing acquisition inspected number sequence maximums are respectively: 6, 6, 4, thus, the maximum inspected number set of described mobile terminal is: { 6, 6, 4}, the collaborative threshold value of supposing the antenna that in described maximum inspected number set, each element is corresponding is 5, need so element " 4 " to delete, return to described step 103, again the element number that obtains described maximum inspected number set is 2, calculate the collaborative threshold value of the antenna corresponding with this element number according to described element number, be assumed to be 6, each element in so described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, now, choose antenna that in described maximum inspected number set, each element " 6 " and " 6 " are corresponding as target antenna.
From such scheme, the antenna selecting method of a kind of distributing antenna system that the embodiment of the present application two provides, by obtaining respectively the default mobile terminal of terminal location point and the timing acquisition inspected number of each described antenna in described communication zone, determine the maximum of the timing acquisition inspected number of described mobile terminal and each described antenna, generate the maximum inspected number set of described mobile terminal in described terminal location point, obtain the element number of described maximum inspected number set, calculate the collaborative threshold value of the antenna corresponding with this element number according to described element number, and judge whether each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, if, choose the antenna corresponding with each element in this maximum inspected number set as target antenna, otherwise, element to numerical value minimum in described maximum inspected number is deleted, return to the element number that again obtains described maximum inspected number set, until whether each element is all more than or equal to the collaborative threshold value of the antenna corresponding with this element in described maximum inspected number set, obtain target antenna, thereby realize the selection of the antenna of working in distributing antenna system, with respect to prior art supposition temporal frequency precise synchronization, timing acquisition process completes, the technical scheme that the embodiment of the present application provides is carried out a day line options in the timing acquisition stage, obtain by the timing acquisition inspected number between mobile terminal and antenna in communication zone, and then work antenna in definite practical communication region is as target antenna, make the antenna of choosing can meet Practical Project demand, accuracy and the validity of day line options are obviously improved.
Preferably, with reference to figure 4, it shows the part flow chart of the antenna selecting method of a kind of distributing antenna system that the embodiment of the present application three provides, and described step 101 can comprise the following steps:
Step 401: obtain respectively the sequence that described mobile terminal that each described antenna reception arrives sends, as receiving sequence.
For example: as shown in Figure 5, training sequence is in time slot (TS for the structure of the sequence of mobile terminal transmitting
1or TS
2) in certain part, as can be in the beginning of a time slot; Meanwhile, can send other data in the front and back of training sequence, as protection interval, antenna receiving-sending switch intermittence etc.
Described receiving sequence can be used r
i(k) represent, for coordinate in described communication zone is (x
i, y
i) i root antenna reception to the sequence sent in described terminal location point of described mobile terminal, i=1,2 ..., N, N is the antenna number in described antenna set to be selected.
Step 402: the correlation function of determining the receiving sequence obtained and default training sequence.
For example: default m (k) is described default training sequence, r
i(k) be receiving sequence, the coordinate getting is (x
i, y
i) i root antenna reception to the sequence sent of described mobile terminal;
Determine the receiving sequence r obtaining
i(k) with the correlation function of default training sequence m (k): Corr
i(d) for coordinate is (x
i, y
i) i root antenna reception to the sequence sent of described mobile terminal and the correlation function of described default training sequence, k=1,2 ..., K, K is the length of described default training sequence, d=1,2 ... D, the length of receiving sequence of obtaining described in the value of D is chosen as and the difference of the length of default training sequence.
It should be noted that, from the definition of D, the value of D and the size of K have nothing to do (can be greater than K, be less than K or equal K).
Step 403: to described correlation function delivery side, obtain timing acquisition inspected number.
For example: to Corr
i(d) delivery side, obtains timing acquisition inspected number | Corr
i(d) |
2, being coordinate is (x
i, y
i) i root antenna and the timing acquisition inspected number of described mobile terminal.
From such scheme, the antenna selecting method of a kind of distributing antenna system that the embodiment of the present application three provides, by obtaining respectively mobile terminal in described terminal location point and the timing acquisition inspected number of each described antenna, afterwards determine the maximum of the timing acquisition inspected number of described mobile terminal and each described antenna, generate the maximum inspected number set of described mobile terminal, and obtain respectively the element number of described maximum inspected number set, calculate the collaborative threshold value of the antenna corresponding with this element number according to described element number, if each element is all more than or equal to the collaborative threshold value of the antenna corresponding with this element in described maximum inspected number set, choose the antenna corresponding with each element in this maximum inspected number set as target antenna, thereby realize the selection of the antenna of working in distributing antenna system.With respect to prior art supposition temporal frequency precise synchronization, timing acquisition process completes, the technical scheme that the embodiment of the present application provides is carried out a day line options in the timing acquisition stage, obtain by the timing acquisition inspected number between mobile terminal and antenna in communication zone, and then work antenna in definite practical communication region is as target antenna, make the antenna of choosing can meet Practical Project demand, obviously improved accuracy and the validity of day line options.
Preferably, in the application, the collaborative threshold value that the described element number of described foundation calculates the antenna corresponding with this element number specifically comprises:
Utilize
calculate the collaborative threshold value of the corresponding antenna of the element number of described maximum inspected number set;
Wherein, T
mfor the collaborative threshold value of the corresponding antenna of the element number of described maximum inspected number set, m=1,2 ..., M, M is the antenna amount in described antenna set to be selected, P
ffor default pre-alarm probability,
be the variance of the default timing acquisition inspected number of m root antenna, MC is the element number in described maximum inspected number set.
It should be noted that, described in
be the variance of the timing acquisition inspected number of m root antenna in the time not having mobile terminal to transmit, this value is preset value.
With reference to figure 6, it shows the structural representation of the antenna selection apparatus of a kind of distributing antenna system that the embodiment of the present application four provides, described application of installation is in the antenna set to be selected that is arranged at default communication zone, and described antenna set to be selected comprises at least two antennas, and described device comprises:
Inspected number acquiring unit 601, for obtaining respectively the mobile terminal of default terminal location point and the timing acquisition inspected number of each described antenna in the default comunication area;
It should be noted that, described communication zone refers to: Zone Full or subregion that in the antenna set to be selected in distributing antenna system, all antennas cover, for example: antenna set to be selected comprises three antennas, described three antennas cover region " Tian'anmen Square " completely, now select this region " Tian'anmen Square " as described communication zone, as shown in Figure 2, wherein, three stains shown in figure represent three antennas in described antenna set to be selected, and three circles shown in figure are respectively the covering circle that the covering radius of three antennas forms.
Maximum determining unit 602, for determining the maximum of timing acquisition amount of described mobile terminal and each described antenna, generates the maximum inspected number set of described mobile terminal in described terminal location point.
Wherein, described maximum determining unit 602 is connected with described inspected number acquiring unit 601.
For example: obtain mobile terminal in mobile terminal point with in coordinate (x
i, y
i) i root antenna timing acquisition inspected number be | Corr
i(d) |
2, wherein, i=1,2 ..., N, N is the number of antenna in described antenna set to be selected, d=1,2 ..., D, the value of D is chosen as described i root antenna reception to the length of sequence of described mobile terminal transmission and the difference of the length of default training sequence.
Suppose, N is 3, and the timing acquisition inspected number of the mobile terminal in described terminal location point and each described antenna is respectively so: | Corr
1(d) |
2, | Corr
2(d) |
2, | Corr
3(d) |
2in described step 102, generate described mobile terminal and be the set of the maximum composition extracting in inspected number sequence in the maximum inspected number set of described shift position point in above-mentioned 3 timing acquisition inspecteds number, if above-mentioned 3 timing acquisition inspected number sequence maximums are respectively: 6,6,4, thus, the maximum inspected number set of described mobile terminal is: { 6,6,4}.
Threshold calculations unit 603, for obtaining the element number of described maximum inspected number set, calculates the collaborative threshold value of the antenna corresponding with this element number according to described element number.
Wherein, described threshold calculations unit 603 is connected with described maximum determining unit 602.
The first identifying unit 604, for judging whether described maximum each element of inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, if so, choose the antenna corresponding with each element in this maximum inspected number set as target antenna.
It should be noted that, described the first identifying unit 604 is connected with described threshold calculations unit 603.
Wherein, if judging each element in described maximum inspected number set, described Antenna selection unit 604 is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, illustrate that the antenna that in this maximum inspected number set, each element is corresponding all can capture the signal of launching when mobile terminal is positioned at described terminal location point, show that thus this antenna can be used as target antenna, thereby described the first identifying unit 604 is chosen antenna that this each element of maximum inspected number set is corresponding as target antenna.
For example: the collaborative threshold value of the antenna that in described maximum inspected number set, each element is corresponding is 4, in so described maximum inspected number set, each element is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, illustrate that the antenna that in this maximum inspected number set, each element is corresponding all can capture the signal of launching when mobile terminal is positioned at all terminal location points, show that thus this antenna can be used as target antenna, thereby, choose antenna that this each element of maximum inspected number set is corresponding as target antenna.
From such scheme, the antenna selection apparatus of a kind of distributing antenna system that the embodiment of the present application four provides, by obtaining respectively the default mobile terminal of terminal location point and the timing acquisition inspected number of each described antenna in described communication zone, determine the maximum of the timing acquisition inspected number of described mobile terminal and each described antenna, generate the maximum inspected number set of described mobile terminal in described terminal location point, obtain the element number of described maximum inspected number set, calculate the collaborative threshold value of the antenna corresponding with this element number according to described element number, and judge whether each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, if, choose the antenna corresponding with each element in this maximum inspected number set as target antenna, thereby realize the selection of the antenna of working in distributing antenna system.With respect to prior art supposition temporal frequency precise synchronization, timing acquisition process completes, the technical scheme that the embodiment of the present application provides is carried out a day line options in the timing acquisition stage, obtain by the timing acquisition inspected number between mobile terminal and antenna in communication zone, and then work antenna in definite practical communication region is as target antenna, make the antenna of choosing can meet Practical Project demand, obviously improved accuracy and the validity of day line options.
Preferably, with reference to figure 7, it shows the structural representation of the antenna selection apparatus of a kind of distributing antenna system that the embodiment of the present application five provides, and described device also comprises:
The second identifying unit 605, if be not all more than or equal to the collaborative threshold value of the antenna corresponding with this element for described maximum each element of inspected number set, delete the element of numerical value minimum in described maximum inspected number set, and whether the maximum inspected number set that judges deletion element is empty, if, finish current day line options, otherwise, trigger described threshold calculations unit 603, until each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element.
Wherein, described the second identifying unit 605 is connected with described threshold calculations unit 603 and described the first identifying unit 604 respectively.
Wherein, if each element in described maximum inspected number set is not the collaborative threshold value that is all more than or equal to the antenna that this element is corresponding, when described the first identifying unit 604 is judged described mobile terminal and is positioned at current terminal location point thus, antenna in described antenna set to be selected can not all capture transmitting of described mobile terminal, described the second identifying unit 605 is deleted the element of numerical value minimum in described maximum inspected number set thus, delete by the antenna transmitting that cannot capture described mobile terminal in described antenna set to be selected, afterwards judge and judge that whether the maximum inspected number set of deleting element is as empty, if, finish current day line options, otherwise, trigger described threshold calculations unit 603, until each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element.
Suppose, the antenna number in described antenna set to be selected is 3, and the timing acquisition amount of so described mobile terminal and each described antenna is respectively: | Corr
1(d) |
2, | Corr
2(d) |
2, | Corr
3(d) |
2, the maximum inspected number set now generating is the set of the maximum composition extracting in above-mentioned 3 timing acquisition inspecteds number in inspected number sequence, if above-mentioned 3 timing acquisition inspected number sequence maximums are respectively: 6, 6, 4, thus, the maximum inspected number set of described mobile terminal is: { 6, 6, 4}, the collaborative threshold value of supposing the antenna that in described maximum inspected number set, each element is corresponding is 5, need so element " 4 " to delete, return to described step 103, again the element number that obtains described maximum inspected number set is 2, calculate the collaborative threshold value of the antenna corresponding with this element number according to described element number, be assumed to be 6, each element in so described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, now, choose antenna that in described maximum inspected number set, each element " 6 " and " 6 " are corresponding as target antenna.
From such scheme, the antenna selection apparatus of a kind of distributing antenna system that the embodiment of the present application five provides, by obtaining respectively the default mobile terminal of terminal location point and the timing acquisition inspected number of each described antenna in described communication zone, determine the maximum of the timing acquisition inspected number of described mobile terminal and each described antenna, generate the maximum inspected number set of described mobile terminal in described terminal location point, obtain the element number of described maximum inspected number set, calculate the collaborative threshold value of the antenna corresponding with this element number according to described element number, and judge whether each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, if, choose the antenna corresponding with each element in this maximum inspected number set as target antenna, otherwise, element to numerical value minimum in described maximum inspected number is deleted, return to the element number that again obtains described maximum inspected number set, until whether each element is all more than or equal to the collaborative threshold value of the antenna corresponding with this element in described maximum inspected number set, obtain target antenna, thereby realize the selection of the antenna of working in distributing antenna system.With respect to prior art supposition temporal frequency precise synchronization, timing acquisition process completes, the technical scheme that the embodiment of the present application provides is carried out a day line options in the timing acquisition stage, obtain by the timing acquisition inspected number between mobile terminal and antenna in communication zone, and then work antenna in definite practical communication region is as target antenna, make the antenna of choosing can meet Practical Project demand, obviously improved accuracy and the validity of day line options.
Preferably, with reference to figure 8, it shows the structural representation of the antenna selection apparatus of a kind of distributing antenna system that the embodiment of the present application six provides, and described inspected number acquiring unit 601 comprises:
Retrieval subelement 611, the sequence sending for obtaining respectively described mobile terminal that each described antenna reception arrives, as receiving sequence;
Inspected number is obtained subelement 612, for determining the correlation function of the receiving sequence obtained and default training sequence, and to described correlation function delivery side, obtains timing acquisition inspected number.
Wherein, described inspected number is obtained subelement 612 and is connected with described retrieval subelement 611.
For example: as shown in Figure 5, training sequence is in time slot (TS for the structure of the sequence of mobile terminal transmitting
1or TS
2) in certain part, as can be in the beginning of a time slot; Meanwhile, can send other data in the front and back of training sequence, as protection interval, antenna receiving-sending switch intermittence etc.
Described receiving sequence can be used r
i(k) represent, for coordinate in described communication zone is (x
i, y
i) i root antenna reception to the sequence sent in described terminal location point of described mobile terminal, i=1,2 ..., N, N is the antenna number in described antenna set to be selected.
For example: default m (k) is described default training sequence, r
i(k) be receiving sequence, the coordinate getting is (x
i, y
i) i root antenna reception to the sequence sent of described mobile terminal; Determine the receiving sequence r obtaining
i(k) with the correlation function of default training sequence m (k): Corr
i(d) for coordinate is (x
i, y
i) i root antenna reception to the sequence sent of described mobile terminal and the correlation function of described default training sequence, k=1,2 ... K, K is the length of described default training sequence, d=1,2,, D, the length of receiving sequence that D obtains described in being and the difference of the length of default training sequence.
It should be noted that, from the definition of D, the value of D and the size of K have nothing to do (can be greater than K, be less than K or equal K).
For example: to Corr
i(d) delivery side, obtains timing acquisition inspected number | Corr
i(d) |
2, being coordinate is (x
i, y
i) i root antenna and the timing acquisition inspected number of described mobile terminal.
From such scheme, the antenna selection apparatus of a kind of distributing antenna system that the embodiment of the present application six provides, by obtaining respectively mobile terminal in described terminal location point and the timing acquisition inspected number of each described antenna, afterwards determine the maximum of the timing acquisition inspected number of described mobile terminal and each described antenna, generate the maximum inspected number set of described mobile terminal, and obtain respectively the element number of described maximum inspected number set, calculate the collaborative threshold value of the antenna corresponding with this element number according to described element number, if each element is all more than or equal to the collaborative threshold value of the antenna corresponding with this element in described maximum inspected number set, choose the antenna corresponding with each element in this maximum inspected number set as target antenna, thereby realize the selection of the antenna of working in distributing antenna system.With respect to prior art supposition temporal frequency precise synchronization, timing acquisition process completes, the technical scheme that the embodiment of the present application provides is carried out a day line options in the timing acquisition stage, obtain by the timing acquisition inspected number between mobile terminal and antenna in communication zone, and then work antenna in definite practical communication region is as target antenna, make the antenna of choosing can meet Practical Project demand, obviously improved accuracy and the validity of day line options.
Preferably, with reference to figure 9, it shows another structural representation of the antenna selection apparatus of a kind of distributing antenna system that the embodiment of the present application six provides, and described device also comprises:
The second identifying unit 605, if be not all more than or equal to the collaborative threshold value of the antenna corresponding with this element for described maximum each element of inspected number set, delete the element of numerical value minimum in described maximum inspected number set, and whether the maximum inspected number set that judges deletion element is empty, if, finish current day line options, otherwise, trigger described threshold calculations unit 603, until each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element.
It should be noted that, described the second identifying unit 605, with consistent described in the embodiment of the present application five, is not described in detail at this.
Preferably, in the application, described collaborative threshold calculations unit 603 specifically for:
Utilize
calculate the collaborative threshold value of the corresponding antenna of the element number of described maximum inspected number set;
Wherein, T
mfor the collaborative threshold value of the corresponding antenna of the element number of described maximum inspected number set, m=1,2 ..., M, M is the antenna amount in described antenna set to be selected, P
ffor default pre-alarm probability,
be the variance of the default timing acquisition inspected number of m root antenna, MC is the element number in described maximum inspected number set.
It should be noted that, described in
be the variance of the timing acquisition inspected number of m root antenna in the time not having mobile terminal to transmit, this value is preset value.
It should be noted that, each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
Antenna selecting method to a kind of distributing antenna system provided by the present invention and device are described in detail above, to the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (4)
1. an antenna selecting method for distributing antenna system, is characterized in that, is applied to the antenna set to be selected that is arranged at default communication zone, and described antenna set to be selected comprises at least two antennas, and described method comprises:
Obtain respectively the default mobile terminal of terminal location point and the timing acquisition inspected number of each described antenna in described communication zone;
Determine the maximum of the timing acquisition inspected number of described mobile terminal and each described antenna, generate the maximum inspected number set of described mobile terminal in described terminal location point;
Obtain the element number of described maximum inspected number set, calculate the collaborative threshold value of the antenna corresponding with this element number according to described element number;
Judge that whether each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, if so, chooses the antenna corresponding with each element in this maximum inspected number set as target antenna;
Wherein, the described mobile terminal of default terminal location point and the timing acquisition inspected number of each described antenna of obtaining respectively in default communication zone comprises:
Obtain respectively the sequence that described mobile terminal that each described antenna reception arrives sends, as receiving sequence;
Determine the correlation function of the receiving sequence obtained and default training sequence;
To described correlation function delivery side, obtain timing acquisition inspected number;
Wherein, the described element number of described foundation calculates the collaborative threshold value of the antenna corresponding with this element number, comprising:
Utilize
calculate the collaborative threshold value of the corresponding antenna of the element number of described maximum inspected number set;
Wherein, T
mfor the collaborative threshold value of the corresponding antenna of the element number of described maximum inspected number set, m=1,2 ..., M, M is the antenna amount in described antenna set to be selected, P
ffor default pre-alarm probability,
be the variance of the default timing acquisition inspected number of m root antenna, M
cfor the element number in described maximum inspected number set.
2. method according to claim 1, is characterized in that, if each element is not all more than or equal to the collaborative threshold value of the antenna corresponding with this element in described maximum inspected number set, described method also comprises:
Delete the element of numerical value minimum in described maximum inspected number set;
Whether the maximum inspected number set that judges deletion element is empty, if, finish current day line options, otherwise, described in returning, obtain the element number of described maximum inspected number set, until each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element.
3. an antenna selection apparatus for distributing antenna system, is characterized in that, is applied to the antenna set to be selected that is arranged at default communication zone, and described antenna set to be selected comprises at least two antennas, and described device comprises:
Inspected number acquiring unit, for obtaining respectively the mobile terminal of default terminal location point and the timing acquisition inspected number of each described antenna in the default comunication area;
Maximum determining unit, for determining the maximum of timing acquisition amount of described mobile terminal and each described antenna, generates the maximum inspected number set of described mobile terminal in described terminal location point;
Threshold calculations unit, for obtaining the element number of described maximum inspected number set, calculates the collaborative threshold value of the antenna corresponding with this element number according to described element number;
The first identifying unit, for judging whether described maximum each element of inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element, if so, chooses the antenna corresponding with each element in this maximum inspected number set as target antenna
Wherein, described inspected number acquiring unit comprises:
Retrieval subelement, the sequence sending for obtaining respectively described mobile terminal that each described antenna reception arrives, as receiving sequence;
Inspected number is obtained subelement, for determining the correlation function of the receiving sequence obtained and default training sequence, and to described correlation function delivery side, obtains timing acquisition inspected number;
Wherein, described threshold calculations unit specifically for:
Utilize
calculate the collaborative threshold value of the corresponding antenna of the element number of described maximum inspected number set;
Wherein, T
mfor the collaborative threshold value of the corresponding antenna of the element number of described maximum inspected number set, m=1,2 ..., M, M is the antenna amount in described antenna set to be selected, P
ffor default pre-alarm probability,
be the variance of the default timing acquisition inspected number of m root antenna, M
cfor the element number in described maximum inspected number set.
4. device according to claim 3, is characterized in that, also comprises:
The second identifying unit, if be not all more than or equal to the collaborative threshold value of the antenna corresponding with this element for described maximum each element of inspected number set, delete the element of numerical value minimum in described maximum inspected number set, and whether the maximum inspected number set that judges deletion element is empty, if, finish current day line options, otherwise, trigger described threshold calculations unit, until each element in described maximum inspected number set is all more than or equal to the collaborative threshold value of the antenna corresponding with this element.
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| EP1885071A1 (en) * | 2005-05-20 | 2008-02-06 | Fujitsu Ltd. | Radio communication device, mobile terminal device, radio communication method |
| CN101631379A (en) * | 2009-06-19 | 2010-01-20 | 东南大学 | Method for power distribution and antenna selection of distributed type antenna mobile communication system |
| CN102231908A (en) * | 2011-07-11 | 2011-11-02 | 北京大学 | Uplink signal timing synchronous prediction compensation method used for satellite mobile communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1885071A1 (en) * | 2005-05-20 | 2008-02-06 | Fujitsu Ltd. | Radio communication device, mobile terminal device, radio communication method |
| CN101631379A (en) * | 2009-06-19 | 2010-01-20 | 东南大学 | Method for power distribution and antenna selection of distributed type antenna mobile communication system |
| CN102231908A (en) * | 2011-07-11 | 2011-11-02 | 北京大学 | Uplink signal timing synchronous prediction compensation method used for satellite mobile communication |
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