CN101621842A - MIMO base station system, method and device for correcting time-delay deviation among channels - Google Patents
MIMO base station system, method and device for correcting time-delay deviation among channels Download PDFInfo
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Abstract
The invention relates to a method for correcting time-delay deviation among channels in an MIMO base station system, comprising the following steps: obtaining reference synchronous time of each outdoor unit relative to other outdoor units according to a synchronous sequence received and transmitted by each outdoor unit; determining the transmission time-delay compensation parameter and reception time-delay compensation parameter of a channels corresponding to each outdoor unit according to the reference synchronous time of each outdoor unit relative to other outdoor units; and correcting the time-delay deviation among channels corresponding to each outdoor unit according to the transmission time-delay compensation parameter and the reception time-delay compensation parameter. The embodiment of the invention also provides an MIMO base station system, and a device for correcting time-delay deviation among channels. The invention can realize time-delay compensation for transmitting all channels, requires no segmenting measurement and reduces the complexity for correcting time-delay deviation among channels according to the transmission time-delay compensation parameter and the reception time-delay compensation parameter obtained by the outdoor unit relative to other outdoor units.
Description
Technical field
The embodiment of the invention relates to communication technical field, relates in particular to the method and the device of a kind of MIMO base station system, correcting time-delay deviation among channels.
Background technology
In the distributed base station system of using MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) technology, the corresponding middle radio frequency link of each antenna is responsible for middle radio frequency link by the outdoor unit of distributed base station and is handled.The link of forming between the indoor unit-outdoor unit of distributed base station-antenna constitutes a passage, described indoor unit is used to carry out base band signal process, can be IDU (the Indoor Unit in the microwave telecommunication devices, indoor unit), or BBU (Building Base band Unite, indoor baseband processing unit); Described outdoor unit is used to receive and dispatch radiofrequency signal, and radiofrequency signal is carried out frequency-conversion processing, can be the ODU (Outdoor Unit, outdoor unit) in the microwave telecommunication devices, or RRU (Remote radio Unit, Remote Radio Unit).There is transmission delay in the indoor unit of distributed base station to indoor unit, and middle radio frequency link is handled also to exist and postponed, and radio frequency link postpones in being referred to as here.Different middle radio frequency links postpones there are differences in the base station, introduces time-delay deviation when causing the MIMO transmitting-receiving between passage, thereby influences final MIMO effect.
In order to reduce the influence that time-delay deviation causes system, existing a kind of scheme is that the channel transfer time delay is directly measured.Specifically be to pour into signal, use instrument that each device or every section link of passage are measured, obtain time delay value, at transmitting terminal or receiving terminal the delay compensation parameter is set then, time-delay deviation is compensated to passage.
The inventor finds that there are the following problems at least in this implementation: need test propagation delay time, intermediate frequency process time delay and the radio frequency processing time delay of the IDU of each passage to ODU respectively, this sectionalization test is comparatively complicated, and then has increased the complexity that the interchannel time-delay deviation is proofreaied and correct.
Summary of the invention
Embodiments of the invention provide a kind of MIMO base station system, reach the method and the device of correcting time-delay deviation among channels in the MIMO base station system, thereby can proofread and correct interchannel time-delay deviation easily.
The objective of the invention is to be achieved through the following technical solutions:
The method of correcting time-delay deviation among channels in a kind of MIMO base station system comprises:
According to the synchronizing sequence that each outdoor unit is received and dispatched mutually, obtain the reference lock in time of relative other outdoor units of described each outdoor unit;
According to the reference lock in time of relative other outdoor units of described each outdoor unit, determine the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of described each outdoor unit correspondence;
According to described transmission delay compensating parameter and described receive time delay compensating parameter the time-delay deviation of the passage of described each outdoor unit correspondence is proofreaied and correct.
The device of correcting time-delay deviation among channels in a kind of MIMO base station system comprises:
Signal acquisition module is used to obtain the synchronizing sequence that other outdoor units that each outdoor unit receives send;
Signal processing module, the synchronizing sequence that is used for obtaining according to described signal acquisition module obtains the reference lock in time of relative other outdoor units of described each outdoor unit;
The parameter determination module is used for the reference lock in time according to relative other outdoor units of described each outdoor unit, determines the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of described each outdoor unit correspondence;
The offset correction module is used for according to described transmission delay compensating parameter and described receive time delay compensating parameter that described parameter determination module is determined the time-delay deviation of the passage of described each outdoor unit correspondence being proofreaied and correct.
A kind of MIMO base station system comprises above-mentioned time-delay deviation means for correcting, at least three outdoor units:
Described at least three outdoor units are used for receiving and dispatching synchronizing sequence mutually by the passage of correspondence;
Described time-delay deviation means for correcting is used to obtain the synchronizing sequence of receiving and dispatching mutually between described at least three outdoor units, and obtains the reference lock in time of relative other outdoor units of each outdoor unit according to described synchronizing sequence; According to the reference lock in time of relative other outdoor units of described each outdoor unit, determine the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of each outdoor unit correspondence; According to described transmission delay compensating parameter and described receive time delay compensating parameter the time-delay deviation of the passage of described each outdoor unit correspondence is proofreaied and correct.
The technical scheme that is provided by the embodiment of the invention described above as can be seen, in the embodiment of the invention, because according to the relative transmission delay compensating parameter and the receive time delay compensating parameter that obtain lock in time of the reference of other outdoor units of outdoor unit, can realize transmitting the delay compensation of full tunnel, need not areal survey, therefore reduced the complexity of correction channel time-delay deviation.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the accompanying drawing of required use is done an introduction simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The processing procedure schematic diagram that Fig. 1 provides for one embodiment of the invention;
The MIMO base station system structural representation of the technical scheme using the embodiment of the invention and provide is provided Fig. 2;
The processing procedure schematic diagram that Fig. 3 provides for the embodiment of the invention;
The apparatus structure schematic diagram that Fig. 4 provides for the embodiment of the invention;
The MIMO base station system structural representation that Fig. 5 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The distributed base station system of using MIMO technique (hereinafter to be referred as the MIMO base station system) is made up of outdoor unit, indoor unit and antenna, and an indoor unit can be supported a plurality of outdoor units, the respectively corresponding antenna of each outdoor unit.In order to proofread and correct the time-delay deviation between each passage in the MIMO base station system, the method that the embodiment of the invention provides specifically comprises following operation as shown in Figure 1:
S101, according to the synchronizing sequence that each outdoor unit is received and dispatched mutually, obtain described each outdoor unit relative reference lock in time of other outdoor units;
S102, according to described each outdoor unit relative reference lock in time of other outdoor units, determine the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of described each outdoor unit correspondence;
S103, the time-delay deviation of the passage of described each outdoor unit correspondence is proofreaied and correct according to described transmission delay compensating parameter and described receive time delay compensating parameter.
Wherein, the reference of relative other outdoor units of outdoor unit is meant the synchronizing time point of this outdoor unit synchronizing sequence that obtains lock in time on other outdoor units, this is with reference to transmitting time+synchronizing sequence transmission delay+synchronizing sequence the passage of transmitter side outdoor unit correspondence in the receive time delay the passage of receiver side outdoor unit correspondence in of lock in time=synchronizing sequence in transmitter side indoor unit side.
Described indoor unit can be IDU or BBU; Described outdoor unit can be ODU or RRU.
The technical scheme that the embodiment of the invention provides, according to the reference lock in time of relative other outdoor units of each outdoor unit, can obtain the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of each outdoor unit correspondence, and then the delay compensation of realization transmission full tunnel, need not areal survey, therefore reduce the complexity of parameter measurement, and then reduced the complexity of correcting time-delay deviation among channels.
Among the invention described above embodiment, the implementation of receiving and dispatching synchronizing sequence between each outdoor unit in the MIMO base station system mutually can comprise: for each outdoor unit is provided with identical transmitting-receiving frequency; An outdoor unit in above-mentioned each outdoor unit sends synchronizing sequence; Other outdoor units in above-mentioned each outdoor unit are set to accepting state, receive the synchronizing sequence that this outdoor unit sends successively, and perhaps, other outdoor units are set to accepting state simultaneously, receive the synchronizing sequence that this outdoor unit sends.In this way, each outdoor unit all sends synchronizing sequence to other outdoor units, so that obtain the reference lock in time of its relative other outdoor units of each outdoor unit.
Outdoor unit passes through corresponding channel transfer synchronizing sequence, and by corresponding antenna reception/transmission synchronizing sequence.
Among the invention described above embodiment, obtain each outdoor unit relatively the implementation of reference lock in time of other outdoor units comprise: the synchronizing channel search to radio frames is obtained synchronizing sequence, obtain the reference lock in time of relative other outdoor units of each outdoor unit according to the synchronizing sequence (for example and without limitation, described synchronizing sequence carries by the synchronizing channel of radio frames) of each outdoor unit reception.When finishing this operation by indoor unit, specific implementation is: indoor unit carries out synchronous searching, obtain the synchronizing sequence that the receiver side outdoor unit receives, and obtain the reference lock in time of relative this receiver side outdoor unit of outdoor unit of this synchronizing sequence of transmission according to described synchronizing sequence; When finishing this operation by the time-delay deviation means for correcting, specific implementation is: described time-delay deviation means for correcting obtains the synchronizing sequence that the receiver side outdoor unit receives, and receives the reference lock in time of unit outside the side room relatively according to the outdoor unit that described synchronizing sequence acquisition sends described synchronizing sequence.
Among the invention described above embodiment, described according to described each outdoor unit relative reference lock in time of other outdoor units, determine that the transmission delay compensating parameter of passage of each outdoor unit correspondence and the implementation of receive time delay compensating parameter specifically comprise: the transmission delay compensating parameter and the receive time delay compensating parameter of the benchmark passage of appointment in each outdoor unit are configured to constant (being configured to 0 usually); According to the reference lock in time of relative other outdoor units of above-mentioned each outdoor unit, and the transmission delay compensating parameter of the benchmark passage of appointment and receive time delay compensating parameter, determine the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of above-mentioned each outdoor unit correspondence.Wherein, the transmission delay compensating parameter of the benchmark passage of the transmission delay-appointment of the benchmark passage of the transmission delay-appointment of the passage of the transmission delay compensating parameter of the passage of described each outdoor unit correspondence=this outdoor unit correspondence; The receive time delay compensating parameter of the benchmark passage of the receive time delay-appointment of the benchmark passage of the receive time delay-appointment of the passage of the receive time delay compensating parameter of the passage of described each outdoor unit correspondence=this outdoor unit correspondence, the transmission delay of described passage and receive time delay basis are accordingly with reference to obtaining lock in time.
To be further detailed with another embodiment below.
The technical scheme that the embodiment of the invention provides is applicable to that any port number is more than or equal to 3 MIMO base station system.In following embodiment, will be example with 4 * 4MIMO base station system shown in Figure 2, the embodiment of the invention is elaborated, the implementation of correcting time-delay deviation among channels is similar in other multichannel MIMO base station systems, will repeat no more.In the following description, the indoor unit in the MIMO base station system all is example with IDU, and outdoor unit all is example with ODU.
In 4 * 4MIMO base station system shown in Figure 2, comprise IDU, ODU0～ODU3, and the antenna of each ODU correspondence.Wherein, IDU sets up with ODU0～ODU3 by CPRI (Common Public Radio Interface, common radio-frequency interface) and links.Be called the passage of an ODU correspondence by the link of forming between the IDU-ODU-antenna, then ODU0～DOU3 respective channel 0～passage 3 respectively.
Under test pattern, the transmitting-receiving frequency unanimity of ODU0～ODU3 is set.In the MIMO base station system, a kind of implementation of correcting time-delay deviation among channels as shown in Figure 3, specific implementation is as follows:
S301, ODU0 is set is accepting state;
The radio frames that S302, ODU1 carry synchronizing sequence by its corresponding antenna transmission;
S303, IDU carry out synchronous searching, obtain by ODU0 and receive the radio frames of carrying synchronizing sequence, and obtain reference T lock in time of the relative ODU0 of ODU1 according to the synchronizing sequence in the described radio frames
10
S304, ODU2 and ODU3 carry the radio frames of synchronizing sequence successively by the antenna transmission of correspondence;
S305, obtain reference T lock in time of the relative ODU0 side of ODU2 respectively with ODU3
20And T
30
Specifically be the operation according to S303, IDU carries out synchronous searching, obtains the radio frames of carrying synchronizing sequence of the ODU2 transmission that receives by ODU0, and obtains reference T lock in time of the relative ODU0 of ODU2 according to the synchronizing sequence in this radio frames
20IDU carries out synchronous searching, obtains the radio frames of carrying synchronizing sequence of the ODU3 transmission that receives by ODU0, and obtains reference T lock in time of the relative ODU0 of ODU3 according to the synchronizing sequence in this radio frames
30
S306, set gradually ODU1, ODU2 and ODU3 is an accepting state;
S307, can obtain reference T lock in time of ODU0, ODU2 and the relative ODU1 of ODU3 respectively with reference to the operation of S302～S303
01, T
21And T
31, reference T lock in time of ODU0, ODU1 and the relative ODU2 of ODU3
02, T
12And T
32, and reference T lock in time of ODU0, ODU1 and the relative ODU3 of ODU2
03, T
13And T
23
S308, be benchmark passage (the transmission delay compensating parameter of passage 0 and receive time delay compensating parameter are constant), obtain the transmission delay compensating parameter and the receive time delay compensating parameter of passage 1～passage 3 with passage 0.
Wherein with reference to T lock in time
10=T
⊿+ T
T1+ T
R0T
20=T
⊿+ T
T2+ T
R0T
30=T
⊿+ T
T3+ T
R0
T
01＝T
⊿+T
t0+T
r1；T
21＝T
⊿+T
t2+T
r1；T
31＝T
⊿+T
t3+T
r1；
T
02＝T
⊿+T
t0+T
r2；T
12＝T
⊿+T
t1+T
r2；T
32＝T
⊿+T
t3+T
r2；
T
03＝T
⊿+T
t0+T
r3；T
13＝T
⊿+T
t1+T
r3；T
23＝T
⊿+T
t2+T
r3
Wherein, T
⊿Be the transmitting time of synchronizing sequence in the IDU side; T
T0, T
T1, T
T2And T
T3Be respectively transmission delay, the T of passage 0～passage 3
R0, T
R1, T
R2And T
R3Be respectively the receive time delay of passage 0～passage 3.
When being the benchmark passage with passage 0, the transmission delay compensating parameter of passage n (n=1,2,3) is: the transmission delay compensating parameter of the transmission delay-passage 0 of transmission delay-passage 0 of passage n; The receive time delay compensating parameter of passage n is: the receive time delay compensating parameter of the receive time delay-passage 0 of receive time delay-passage 0 of passage n.With the transmission delay compensating parameter of passage 0 and receive time delay compensating parameter is 0 to be example, and then the transmission delay compensating parameter of passage 1～passage 3 is respectively: T
12-T
02, T
21-T
01And T
31-T
01, the receive time delay compensating parameter of passage 1～passage 3 is respectively: T
21-T
20, T
12-T
10And T
13-T
10
In the technical scheme that the embodiment of the invention provides, any passage in passage 1～passage 3 can also be set as the benchmark passage, the implementation that obtains the transmission delay compensating parameter of passage and receive time delay compensating parameter is the same.
By above-mentioned processing procedure, realized in full tunnel, carrying out passage transmission delay/receive time delay compensation, the more accurate correction that realizes the interchannel time-delay deviation, in addition, owing to need not areal survey, and then reduced the complexity of parameter measurement and the complexity of correcting time-delay deviation among channels, and reduced the difficulty of parameter measurement.Above-mentioned processing procedure can be carried out after outdoor unit initially powers on.In addition, according to the above-mentioned derivation of equation as can be known, in 4 * 4MIMO base station system, when being the benchmark passage with passage 0, the reference that actual needs is measured only is lock in time: T
01, T
02, T
10, T
12, T
13, T
20, T
21And T
31Therefore, in the actual measurement process, can only measure above-mentioned with reference to T lock in time
01, T
02, T
10, T
12, T
13, T
20, T
21And T
31Get final product, and then reduce and measure the required time, improve and proofread and correct efficient.
In the above-mentioned processing procedure, ODU0～ODU3 receives the synchronizing sequence that other ODU send respectively, in the MIMO base station system, realizes in the processing procedure of correcting time-delay deviation among channels, can also be when certain ODU send synchronizing sequence, other ODU receive described synchronizing sequence simultaneously.And other treatment steps and above-mentioned processing procedure are similar, repeat no more here.
The all or part of step of realization said method embodiment can be finished by the relevant hardware of program command, and aforesaid program can be stored in the computer read/write memory medium, and this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as read only memory ROM, random access memory ram, magnetic disc or CD.
The embodiment of the invention also provides the device of correcting time-delay deviation among channels in a kind of MIMO base station system, its structure as shown in Figure 4, the specific implementation structure comprises:
Signal acquisition module 41 is used to obtain the synchronizing sequence that other outdoor units that each outdoor unit receives send;
Signal processing module 42 is used for obtaining each outdoor unit relative reference lock in time of other outdoor units according to the synchronizing sequence that described signal acquisition module 41 obtains;
Parameter determination module 43 is used for the reference lock in time according to relative other outdoor units of described each outdoor unit, determines the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of described each outdoor unit correspondence;
The offset correction module is used for according to described transmission delay compensating parameter and described receive time delay compensating parameter that described parameter determination module is determined the time-delay deviation of the passage of described each outdoor unit correspondence being proofreaied and correct.
Wherein, the reference of relative other outdoor units of outdoor unit is meant the synchronizing time point of this outdoor unit that obtains lock in time on other outdoor units, this is with reference to transmitting time+synchronizing sequence transmission delay+synchronizing sequence the passage of transmitter side outdoor unit correspondence in the receive time delay the passage of receiver side outdoor unit correspondence in of lock in time=synchronizing sequence in the indoor unit side.
For example and without limitation, the synchronizing channel of described synchronizing sequence radio frames is carried, and described signal acquisition module 41 specifically is used for the synchronizing channel search of radio frames is obtained synchronizing sequence; Signal processing module specifically is used for obtaining according to the described synchronizing sequence that described signal receiving module obtains the reference lock in time of relative other outdoor units of described each outdoor unit.In the MIMO base station system, each outdoor unit is received and dispatched synchronizing sequence mutually, and what described signal acquisition module 41 obtained is that each outdoor unit is received and dispatched in the synchronizing sequence process synchronizing sequence that the receiver side outdoor unit receives mutually.
In the device that the invention described above embodiment provides, described delay compensation module 43 specifically is used for the transmission delay compensating parameter of the benchmark passage of appointment and receive time delay compensating parameter are configured to constant (for example, can be configured to 0); According to the reference lock in time of relative other outdoor units of each outdoor unit, and the transmission delay compensating parameter of the benchmark passage of described configuration and receive time delay compensating parameter, determine the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of each outdoor unit correspondence.Wherein, the transmission delay compensating parameter of the benchmark passage of the transmission delay-appointment of the benchmark passage of the transmission delay-appointment of the passage of the transmission delay compensating parameter of the passage of described outdoor unit correspondence=this outdoor unit correspondence; The receive time delay compensating parameter of the benchmark passage of the receive time delay-appointment of the benchmark passage of the receive time delay-appointment of the passage of the receive time delay compensating parameter of the passage of described outdoor unit correspondence=this outdoor unit correspondence, the transmission delay of described passage and receive time delay basis are accordingly with reference to obtaining lock in time.
The time-delay deviation means for correcting that the embodiment of the invention provides, according to the reference lock in time of relative other outdoor units of each outdoor unit, can obtain the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of each outdoor unit correspondence, and then the delay compensation of realization transmission full tunnel, need not areal survey, therefore reduce the complexity of parameter measurement, and then reduced the complexity of correcting time-delay deviation among channels, and reduced the difficulty of parameter measurement.
The embodiment of the invention also provides a kind of MIMO base station system, and its system constitutes as shown in Figure 5, and the specific implementation structure comprises above-mentioned time-delay deviation means for correcting 310, at least three outdoor unit 320～32n, wherein:
Described outdoor unit 320～32n is used for sending out synchronizing sequence mutually by other outdoor units of the passage 0～n of correspondence and MIMO base station system;
Described time-delay deviation means for correcting 310 is used to obtain the synchronizing sequence of receiving and dispatching mutually between described at least three outdoor units, and obtains the reference lock in time of relative other outdoor units of each outdoor unit according to described synchronizing sequence; According to the reference lock in time of relative other outdoor units of described each outdoor unit, determine the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of each outdoor unit correspondence; According to described transmission delay compensating parameter and described receive time delay compensating parameter the time-delay deviation of the passage of described each outdoor unit correspondence is proofreaied and correct.Wherein, the reference of relative other outdoor units of outdoor unit is meant the synchronizing time point of this outdoor unit that obtains lock in time on other outdoor units, this is with reference to transmitting time+synchronizing sequence transmission delay+synchronizing sequence the passage of this outdoor unit correspondence in the receive time delay the passage of receiver side outdoor unit correspondence in of lock in time=synchronizing sequence in the IDU side.Described outdoor unit can be ODU or RRU.
The system that the embodiment of the invention provides comprises in the operation of carrying out interchannel time-delay deviation timing: for each outdoor unit in the MIMO base station system is provided with identical transmitting-receiving frequency, and send synchronizing sequence successively; When an outdoor unit sent synchronizing sequence, other outdoor units received described synchronizing sequence successively, and perhaps, other outdoor units receive described synchronizing sequence simultaneously.In this way, each outdoor unit all sends synchronizing sequence to other outdoor units, so that obtain the reference lock in time of its relative other outdoor units.Be set up identical transmitting-receiving frequency by each outdoor unit, guaranteed successfully to receive and dispatch synchronizing sequence mutually between each outdoor unit.
Wherein, outdoor unit passes through corresponding channel transfer synchronizing sequence, and by corresponding antenna reception/transmission synchronizing sequence.
In the MIMO base station system that the embodiment of the invention provides, described time-delay deviation means for correcting 310 both can be the device that is provided with separately, also can be the functional module in the indoor unit.
The MIMO base station system that the embodiment of the invention provides, because the time-delay deviation means for correcting is according to the reference lock in time of relative other outdoor units of each outdoor unit, can obtain the transmission delay compensating parameter and the receive time delay compensating parameter of each outdoor unit, and then the delay compensation of realization transmission full tunnel, need not areal survey, therefore reduce the complexity of parameter measurement, and then reduced the complexity of correcting time-delay deviation among channels, and reduced the difficulty of parameter measurement.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (9)
1, the method for correcting time-delay deviation among channels in a kind of MIMO base station system is characterized in that, comprising:
According to the synchronizing sequence that each outdoor unit is received and dispatched mutually, obtain the reference lock in time of relative other outdoor units of described each outdoor unit;
According to the reference lock in time of relative other outdoor units of described each outdoor unit, determine the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of described each outdoor unit correspondence;
According to described transmission delay compensating parameter and described receive time delay compensating parameter the time-delay deviation of the passage of described each outdoor unit correspondence is proofreaied and correct.
2, method according to claim 1 is characterized in that, described method also comprises:
Described each outdoor unit is provided with identical transmitting-receiving frequency;
An outdoor unit in described each outdoor unit sends synchronizing sequence;
Other outdoor units in described each outdoor unit are set to accepting state, receive described synchronizing sequence successively, and perhaps described other outdoor units receive described synchronizing sequence simultaneously.
3, method according to claim 2 is characterized in that, described synchronizing sequence carries by the synchronizing channel of radio frames, and described each outdoor unit of described acquisition is the reference lock in time of other outdoor units relatively, comprising:
Synchronizing channel search to described radio frames is obtained synchronizing sequence, obtains the reference lock in time of relative other outdoor units of described each outdoor unit according to described synchronizing sequence.
4, according to any described method of claim 1～3, it is characterized in that, described according to described each outdoor unit relative reference lock in time of other outdoor units, determine the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of described each outdoor unit correspondence, comprising:
The transmission delay compensating parameter and the receive time delay compensating parameter of the benchmark passage of appointment in described each outdoor unit are configured to constant;
According to the reference lock in time of relative other outdoor units of described each outdoor unit, and the transmission delay compensating parameter of the benchmark passage of appointment and receive time delay compensating parameter, determine the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of described each outdoor unit correspondence, the transmission delay compensating parameter of the benchmark passage of the transmission delay-appointment of the benchmark passage of the transmission delay-appointment of the passage of the transmission delay compensating parameter of the passage of described each outdoor unit correspondence=this outdoor unit correspondence, the receive time delay compensating parameter of the benchmark passage of the receive time delay-appointment of the benchmark passage of the receive time delay-appointment of the passage of the receive time delay compensating parameter of the passage of described each outdoor unit correspondence=this outdoor unit correspondence.
5, the device of correcting time-delay deviation among channels in a kind of MIMO base station system is characterized in that, comprising:
Signal acquisition module is used to obtain the synchronizing sequence that other outdoor units that each outdoor unit receives send;
Signal processing module, the synchronizing sequence that is used for obtaining according to described signal acquisition module obtains the reference lock in time of relative other outdoor units of described each outdoor unit;
The parameter determination module is used for the reference lock in time according to relative other outdoor units of described each outdoor unit, determines the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of described each outdoor unit correspondence;
The offset correction module is used for according to described transmission delay compensating parameter and described receive time delay compensating parameter that described parameter determination module is determined the time-delay deviation of the passage of described each outdoor unit correspondence being proofreaied and correct.
6, device according to claim 5 is characterized in that, described synchronizing sequence carries by the synchronizing channel of radio frames, and described signal acquisition module specifically is used for the synchronizing channel of described radio frames is searched for the acquisition synchronizing sequence; Signal processing module specifically is used for obtaining according to the described synchronizing sequence that described signal receiving module obtains the reference lock in time of relative other outdoor units of described each outdoor unit.
According to claim 5 or 6 described devices, it is characterized in that 7, described delay compensation module specifically is used for the transmission delay compensating parameter of the benchmark passage of appointment and receive time delay compensating parameter are configured to constant; According to the reference lock in time of relative other outdoor units of each outdoor unit, and the transmission delay compensating parameter of the benchmark passage of described configuration and receive time delay compensating parameter, determine the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of each outdoor unit correspondence.
8, a kind of MIMO base station system is characterized in that, comprises aforesaid right requirement 5～7 any described time-delay deviation means for correctings, at least three outdoor units:
Described at least three outdoor units are used for receiving and dispatching synchronizing sequence mutually by the passage of correspondence;
Described time-delay deviation means for correcting is used to obtain the synchronizing sequence of receiving and dispatching mutually between described at least three outdoor units, and obtains the reference lock in time of relative other outdoor units of each outdoor unit according to described synchronizing sequence; According to the reference lock in time of relative other outdoor units of described each outdoor unit, determine the transmission delay compensating parameter and the receive time delay compensating parameter of the passage of each outdoor unit correspondence; According to described transmission delay compensating parameter and described receive time delay compensating parameter the time-delay deviation of the passage of described each outdoor unit correspondence is proofreaied and correct.
9, base station system according to claim 8 is characterized in that, described each outdoor unit is set to identical transmitting-receiving frequency, and sends synchronizing sequence successively; When an outdoor unit sent synchronizing sequence, other outdoor units received described synchronizing sequence successively, and perhaps other outdoor units receive described synchronizing sequence simultaneously.
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Cited By (6)
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| WO2016074442A1 (en) * | 2014-11-14 | 2016-05-19 | 中兴通讯股份有限公司 | Method and device for conducting downlink correction in massive multiple-input multiple-output system |
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