CN103905345A - Channel correction device, method and system - Google Patents
Channel correction device, method and system Download PDFInfo
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- CN103905345A CN103905345A CN201210578470.7A CN201210578470A CN103905345A CN 103905345 A CN103905345 A CN 103905345A CN 201210578470 A CN201210578470 A CN 201210578470A CN 103905345 A CN103905345 A CN 103905345A
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Abstract
The invention provides a channel correction device, method and system. The channel correction device includes a first communication interface, a signal conversion unit and at least two correction interfaces. The first communication interface is in communication connection with an indoor baseband unit BBU so as to receive baseband reference signals from the BBU. The signal conversion unit is connected with the first communication interface and the at least two correction interfaces so as to convert the baseband reference signals into radio-frequency reference signals and send the radio-frequency reference signals to the at least two correction interfaces. The at least two correction interfaces are in communication connection with at least two coupling units for sending the radio-frequency reference signals to the two coupling units respectively. Therefore, the BBU which is used for channel correction can obtain an estimation value of a channel response of a service sending channel of an RRU and thus unified channel correction on a service receiving channel or a service sending channel of each RRU through use of the BBU which is used for channel correction is realized.
Description
Technical field
The embodiment of the present invention relates to the communication technology, relates in particular to a kind of channel correcting device, method and system.
Background technology
Along with the development of the communication technology, the distributed base station being made up of indoor Base Band Unit (Building Base band Unit, BBU) and Remote Radio Unit (Radio Remote Unit, RRU) is widely used.In distributed base station, BBU is connected with one or more RRU by optical fiber, is provided with one or more business interfaces on each RRU, and RRU is connected with coupling unit by business interface.If coupling unit is the independent coupling disc arranging, RRU is connected with antenna by this coupling disc; If coupling unit is the coupled structure that is arranged at antenna inside, RRU is directly connected with antenna.Each business interface is connected with receives service channel and sending service passage, receives the radiofrequency signal that service channel reception coupling unit sends, or utilize sending service passage to send radiofrequency signal to coupling unit so that RRU utilizes.In time division duplex (Time Division Duplexing, TDD) system, each business interface is opened and is received service channel or sending service passage at synchronization.
In TDD system, the detection reference signal (Sounding Reference Signal, SRS) that BBU sends by detecting subscriber equipment (User Equipment, UE), channel response to up channel is estimated, wherein goes up the receipts service channel that includes RRU in lower channel.According to the reciprocity of the up channel in TDD system and down channel, BBU can utilize estimated go out the channel response of up channel, as the channel response of down channel, and utilize it to calculate weights, downstream signal is carried out to wave beam forming, so that the signal after wave beam forming is launched.
To receive service channel and sending service passage be to be made up of hardware independently due to each of RRU, and their channel response is different.And the wave beam forming of TDD system requires between each receipts service channel to have consistent channel response, also require to there is consistent channel response between each sending service passage, therefore, need to receive service channel and/or sending service passage carries out channel correcting to each of RRU.To respectively each the channel response of receiving service channel or sending service passage compensated, the receipts service channel that each business interface connected is identical with the ratio of the channel response of sending service passage.
Fig. 1 is the single RRU channel correcting schematic diagram with outer correction interface, as shown in Figure 1, not only comprises multiple business interfaces and the communication interface being connected with BBU on RRU, also comprises correction interface.Wherein, the annexation of each business interface and coupling unit represents by four-headed arrow, represents that each business interface is connected with receipts service channel and sending service passage; The annexation of correction interface and coupling unit also represents by four-headed arrow, represents that correction interface is connected with passage for receiving transmission and for sending out a passage for transmission, RRU realizes reception and the transmission to correction reference signal by correction interface; This correction interface is also connected with the correction channel of RRU inside.RRU, by the communication interface being connected with BBU, sends to BBU by signal received business interface, receives service channel carry out channel correcting for BBU to each; Or utilize correction channel to send to BBU signal received correction interface, for BBU, each sending service passage carried out to channel correcting.
In order to improve throughput and the average throughput of the UE in cell edge, utilize coordinate multipoint (Coordinative Multiple Point, CoMP) (the Joint Transmission of the joint transmission in technology, JT) technology, make in the UE of critical zone, multiple community can receive multiple communities RRU send send out data.
Under such application scenarios, in order to guarantee the effect of joint transmission technology, BBU not only needs in single RRU each to receive service channel or sending service passage carries out channel correcting, also need each of multiple RRU to carrying out joint transmission to receive service channel or sending service passage carries out unified channel correcting, but, BBU of the prior art only can realize the channel correcting of receiving service channel or sending service passage and carrying out in single RRU, and the method that there is no receives service channel to each in multiple RRU or channel correcting is carried out in the unification of sending service passage.
Summary of the invention
The invention provides a kind of channel correcting device, method and system, cannot be to each of the multiple RRU problem of receiving service channel or the unification of sending service passage and carry out channel correcting for solving.
First aspect of the present invention is to provide a kind of channel correcting device, comprising: the first communication interface, signal conversion unit and at least two correction interfaces;
Described the first communication interface and indoor Base Band Unit BBU communication connection, for receiving base band reference signal from described BBU;
Described signal conversion unit is connected with described the first communication interface and described at least two correction interfaces respectively, for described base band reference signal is converted to radio frequency reference signal, and at least two correction interfaces described in described radio frequency reference signal is sent to;
Described at least two correction interfaces respectively with the communication connection of at least two coupling units, at least two coupling units described in described radio frequency reference signal is sent to respectively.
The channel correcting device providing in conjunction with first aspect, in the possible implementation of the first, described channel correcting device also comprises at least one the second communication interface being connected with described signal conversion unit;
A coupling unit communication connection in described at least one second communication interface and described at least two coupling units, the radio-frequency (RF) FEEDBACK signal returning for receiving described coupling unit, and described radio-frequency (RF) FEEDBACK signal is sent to described signal conversion unit;
Correspondingly, described signal conversion unit also for, described radio-frequency (RF) FEEDBACK signal is converted to baseband feedback signal, and described baseband feedback signal is sent to described the first communication interface, for described the first communication interface, described baseband feedback signal is sent to described BBU.
In conjunction with first aspect or the possible implementation of the first, in the possible implementation of the second, described channel correcting device also comprises along separate routes or combiner unit;
Described shunt or combiner unit, be connected with described signal conversion unit and described at least two correction interfaces respectively, for the radio frequency reference signal of signal conversion unit output is assigned as at least two paths of signals, at least two correction interfaces described in sending to respectively.
Second aspect of the present invention is to provide a kind of channel correcting device, comprising: the first communication interface, signal conversion unit and at least two correction interfaces;
Described at least two correction interfaces, respectively with the communication connection of at least two coupling units, at least two at least two radio-frequency (RF) FEEDBACK signals that coupling unit sends respectively described in receiving;
Described signal conversion unit is connected with described at least two correction interfaces and described the first communication interface respectively, for described at least two radio-frequency (RF) FEEDBACK signals are converted to baseband feedback signal, and described baseband feedback signal is sent to described the first communication interface;
Described the first communication interface and BBU communication connection, for sending to described BBU by described baseband feedback signal.
The channel correcting device providing in conjunction with second aspect, in the possible implementation of the first, described channel correcting device also comprises at least one the second communication interface being connected with described signal conversion unit, a coupling unit communication connection in described at least one second communication interface and described at least two coupling units;
Correspondingly, described the first communication interface also for, receive base band reference signal from described BBU; Described signal conversion unit also for, described base band reference signal is converted to radio frequency reference signal, and sends to described at least one second communication interface; Described at least one second communication interface is used for, and described radio frequency reference signal is sent to described coupling unit, so that described coupling unit returns to the radio-frequency (RF) FEEDBACK signal of described radio frequency reference signal to a correction interface in described at least two correction interfaces.
In conjunction with second aspect or the possible implementation of the first, in the possible implementation of the second, described channel correcting device also comprises along separate routes or combiner unit;
Described shunt or combiner unit, be connected with described signal conversion unit and described at least two correction interfaces respectively, merge into a road signal at least two radio-frequency (RF) FEEDBACK signals that described at least two correction interfaces are received respectively, send to described signal conversion unit.
Third aspect of the present invention is to provide a kind of channel correcting method, comprising:
Receive the base band reference signal that BBU sends;
Described base band reference signal is converted to radio frequency reference signal;
Described radio frequency reference signal is sent to at least two coupling units, return at least two radio-frequency (RF) FEEDBACK signals of described radio frequency reference signal for described at least two coupling units.
In conjunction with the 3rd channel correcting method that aspect provides, in the possible implementation of the first, described method also comprises:
The radio-frequency (RF) FEEDBACK signal that a coupling unit described in reception at least two coupling units returns;
Described radio-frequency (RF) FEEDBACK signal is converted to baseband feedback signal, and described baseband feedback signal is sent to described BBU.
The 4th aspect of the present invention is to provide a kind of channel correcting method, comprising:
Receive at least two radio-frequency (RF) FEEDBACK signals that at least two coupling units send;
Described at least two radio-frequency (RF) FEEDBACK signals are converted to baseband feedback signal;
Described baseband feedback signal is sent to BBU.
In conjunction with the 4th channel correcting method that aspect provides, in the possible implementation of the first, described method also comprises:
Receive the base band reference signal that described BBU sends;
Described base band reference signal is converted to radio frequency reference signal;
A coupling unit described in described radio frequency reference signal is sent at least two coupling units, so that described coupling unit returns to the radio-frequency (RF) FEEDBACK signal of described radio frequency reference signal.
The 5th aspect of the present invention is to provide a kind of channel correcting system, comprises at least one BBU, above-mentioned channel correcting device, at least one radio frequency remote unit RRU and at least two coupling units; Between described BBU, described channel correcting device, described RRU and described coupling unit, communicate to connect.
The channel correcting device that the embodiment of the present invention provides, method and system, utilize two or more correction interfaces to connect respectively two or more coupling units, by radio frequency reference signal is sent to coupling unit by each correction interface, so that must be used for carrying out the BBU of channel correcting, can obtain the estimated value of the channel response of the receipts service channel of RRU, or by each correction interface from each coupling unit received RF feedback signal, so that must be used for carrying out the BBU of channel correcting, can obtain the estimated value of the channel response of the sending service passage of RRU, thereby realize and utilize this receipts service channel or sending service passage to each RRU carries out unified channel correcting for the BBU that carries out channel correcting.
Accompanying drawing explanation
Fig. 1 is the single RRU channel correcting schematic diagram with outer correction interface;
The structural representation of the channel correcting device that Fig. 2 provides for the embodiment of the present invention;
The structural representation of another channel correcting device that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the another channel correcting device that Fig. 4 provides for the embodiment of the present invention;
The structural representation of the another channel correcting device that Fig. 5 provides for the embodiment of the present invention;
The structural representation of the another channel correcting device that Fig. 6 provides for the embodiment of the present invention;
The structural representation of the channel correcting system that Fig. 7 a provides for the embodiment of the present invention;
The structural representation of another channel correcting system that Fig. 7 b provides for the embodiment of the present invention;
The flow chart of the channel correcting method that Fig. 8 provides for the embodiment of the present invention;
The flow chart of another channel correcting method that Fig. 9 provides for the embodiment of the present invention.
Embodiment
The structural representation of the channel correcting device that Fig. 2 provides for the embodiment of the present invention, as shown in Figure 2, this channel correcting device comprises the first communication interface 11, signal conversion unit 12 and at least two correction interfaces 13.
Wherein, described the first communication interface 11 and BBU communication connection, described signal conversion unit 12 is connected with described the first communication interface 11 and described at least two correction interfaces 13 respectively, and described at least two correction interfaces 13 communicate to connect with at least two coupling units respectively.
Concrete, channel correcting device is connected with BBU by the first communication interface 11, is connected with coupling unit by correction interface 13.Correction interface 13 on channel correcting device can be two or more, and each correction interface 13 is all connected with a coupling unit.
On each coupling unit, include a coupling unit correction interface for being connected with correction interface 13, and one or more coupling unit business interface for being connected with the business interface of RRU.Coupling unit can, for being arranged on the independently coupling disc between channel correcting device and antenna, can also be the coupled structure of antenna inside.In the time that coupling unit is the independently coupling disc being arranged between channel correcting device and antenna, on coupling unit, also comprise the interface for being connected with antenna.
Two or more coupling units are connected on each correction interface 13 of same channel correcting device by coupling unit correction interface separately respectively, and each coupling unit is connected on different RRU by coupling unit business interface separately.Each RRU can be connected to identical BBU above with channel correcting device, also can be connected on different BBU.
For receiving service channel and sending service passage, to carry out the method for channel correcting as follows.
The method of the channel correcting of concrete receipts service channel is that base band reference signal is sent to this channel correcting device by the BBU that channel correcting device connects; Channel correcting device receives base band reference signal by the first communication interface 11 from BBU, and this base band reference signal is sent to the signal conversion unit 12 in channel correcting device; This base band reference signal is converted to radio frequency reference signal by signal conversion unit 12, and this radio frequency reference signal is sent to the two or more correction interfaces 13 in channel correcting device; The radio frequency reference signal receiving is sent to connected coupling unit by the correction interface 13 that is connected with coupling unit, that is to say, when channel correcting device is connected with two or more coupling units, radio frequency reference signal is sent to respectively to this two or more coupling units.
Each coupling unit by coupling unit correction interface after channel correcting device receives radio frequency reference signal, a part of signal in radio frequency reference signal is sent to antenna or goes out by antenna transmission, and according to the structure of coupling unit, give connected RRU by the fraction signal feedback in radio frequency reference signal.Be that radio-frequency (RF) FEEDBACK signal is sent to connected RRU by each coupling unit.Wherein, coupling unit is launched the radio frequency reference signal receiving or the ratio fed back is by the structures shape of coupling unit.
Each RRU is by one or more business interface received RF feedback signals, that is to say that RRU is by one or more up receipts service channels received RF feedback signal respectively, the radio-frequency (RF) FEEDBACK signal that each up receipts service channel is received is respectively converted to baseband feedback signal, and the BBU that sends to it to connect baseband feedback signal.Due to the impact of the hardware configuration of RRU inside, make signal, through up receipts service channel or the descending sending service passage of RRU, certain change occur afterwards, that is to say, when signal each up receipts service channel of process or descending sending service passage, produce respectively different channel responses.
If each RRU and channel correcting device are connected on same BBU, by each RRU, baseband feedback signal is returned to this BBU, this RRU is according to the baseband feedback signal receiving, channel response to each up receipts service channel estimates, thereby can calculate the estimated value of the channel response of each the up receipts service channel of each RRU.This BBU is as the BBU for carrying out channel correcting, and therefore, this BBU, according to the each estimated value calculating, unifies to proofread and correct to each of each RRU up receipts service channel.
If each RRU is connected on different BBU from channel correcting device, each RRU sends to baseband feedback signal the BBU connecting separately, each BBU is respectively according to the baseband feedback signal receiving, and the channel response of each the up receipts service channel to connected RRU is estimated.In the BBU being connected with RRU or channel correcting device, using one of them BBU as the BBU for carrying out channel correcting.Correspondingly, the BBU being connected with RRU, after the estimated value of channel response that calculates each up receipts service channel, is sent to each estimated value respectively this for carrying out the BBU of channel correcting.Thereby this BBU that is used for carrying out channel correcting receives service channel to each of each RRU and carries out unified channel correcting.Wherein, can be the BBU being connected with channel correcting device for carrying out the BBU of channel correcting, can not also the BBU being connected with channel correcting device.
According to the Different treatments to above-mentioned two situations, because channel correcting device is connected with two or more coupling units, each coupling unit is connected with RRU respectively, therefore, no matter whether to be connected to identical BBU upper for each RRU and channel correcting device, for carrying out the estimated value of channel response of the each receipts service channel on RRU that the BBU of channel correcting all can know that each coupling unit connects respectively.Thereby, receive service channel by the BBU for carrying out channel correcting to each of each RRU and carry out unified channel correcting.
Concrete, the method that BBU estimates receiving the channel response of service channel according to baseband feedback signal, can adopt with prior art in similar implementation, this repeats no more.
The method of the channel correcting of concrete sending service passage is as follows.
If it is upper that each RRU and channel correcting device are connected to same BBU, by this BBU is unified, base band reference signal is sent to each RRU.
If each RRU is connected on different BBU from channel correcting device, one or more BBU that each RRU connects, according to the rule of the transmission base band reference signal setting in advance, utilize default time resource, frequency resource or code territory resource that base band reference signal is sent to each RRU.
Each RRU, receiving after base band reference signal, is converted to radio frequency reference signal by base band reference signal, and by least one business interface, radio frequency reference signal is sent to connected coupling unit; Coupling unit sends to the part in received radio frequency reference signal antenna or goes out by antenna transmission, and the sub-fraction in radio frequency reference signal, by the coupling unit correction interface on it, is fed back to connected channel correcting device.
Because radio frequency reference signal is that RRU sends to respectively coupling unit by multiple business interfaces, utilize multiple sending service passages to send, therefore the radio-frequency (RF) FEEDBACK signal that, coupling unit returns to channel correcting device by coupling unit correction interface comprises the radio-frequency (RF) FEEDBACK signal of multiple sending service passages.
After each coupling unit all feeds back, two or more correction interfaces 13 of this channel correcting device will receive respectively radio-frequency (RF) FEEDBACK signal, and multiple radio-frequency (RF) FEEDBACK signals have comprised the radio-frequency (RF) FEEDBACK signal of each sending service passage of multiple RRU.
The radio-frequency (RF) FEEDBACK signal that channel correcting device receives two or more correction interfaces 13 respectively, is converted to baseband feedback signal through signal conversion unit 12, and baseband feedback signal is sent to connected BBU by the first communication interface 11.Because baseband feedback signal has comprised the baseband feedback signal of each the sending service passage of multiple RRU, the mode of dividing according to time-division, frequency division or code according to the rule setting in advance again, baseband feedback signal is carried out to respective handling, obtain respectively the complete channel response estimated value of each the sending service passage of each RRU, thereby this BBU can calculate the estimated value of the channel response of each the sending service passage of each RRU.
Because channel correcting device is connected with two or more coupling units, each coupling unit is connected with RRU respectively, therefore, no matter whether to be connected to identical BBU upper for each RRU and channel correcting device, and the BBU being connected with channel correcting device can calculate the estimated value of the channel response of the each sending service passage on the RRU that each coupling unit connects respectively.
After the BBU being connected with channel correcting device calculates the estimated value of channel response of the sending service passage of each RRU, can carry out unified channel correcting to each the sending service passage of each RRU according to each estimated value.The BBU being connected with channel correcting device can also be sent to each estimated value other for carrying out the BBU of channel correcting, according to each estimated value, each the sending service passage of each RRU is carried out to unified channel correcting for this BBU.
Concrete, the method that BBU estimates the channel response of sending service passage according to baseband feedback signal, can adopt with prior art in similar implementation, this repeats no more.
The channel correcting device that the embodiment of the present invention provides, utilize two or more correction interfaces to connect respectively two or more coupling units, by radio frequency reference signal is sent to coupling unit by each correction interface, so that must be used for carrying out the BBU of channel correcting, can obtain the estimated value of the channel response of the receipts service channel of RRU, or by each correction interface from each coupling unit received RF feedback signal, so that must be used for carrying out the BBU of channel correcting, can obtain the estimated value of the channel response of the sending service passage of RRU, thereby realize and utilize this receipts service channel or sending service passage to each RRU carries out unified channel correcting for the BBU that carries out channel correcting.
The structural representation of another channel correcting device that Fig. 3 provides for the embodiment of the present invention, as shown in Figure 3, this channel correcting device also comprises at least one second communication interface 14.Wherein, at least one second communication interface 14 is connected with described signal conversion unit 12 in channel correcting device inside, communicates to connect with a coupling unit in described at least two coupling units in channel correcting device outside.
Concrete, on the basis of the channel correcting device shown in Fig. 2, on channel correcting device in the embodiment of the present invention, can also comprise at least one second communication interface 14, at least one second communication interface 14 is upper at least one business interface for being connected with the coupling unit business interface of coupling unit of RRU.
This channel correcting device can have the function of RRU, but RRU only comprises a correction interface, and channel correcting device in the embodiment of the present invention comprises at least two correction interfaces 13.Wherein, at least two correction interfaces 13 are all connected on signal conversion unit 12, specifically, between signal conversion unit 12 and at least two correction interfaces 13, realize the signal method on Huo He road along separate routes, can adopt with prior art in similar implementation, this time do not repeating.
In the situation that channel correcting device comprises at least one second communication interface 14, this channel correcting device can utilize this at least one second communication interface 14 to be directly connected with a coupling unit.That is to say that the coupling unit that at least one second communication interface 14 of channel correcting device connects is also connected on a correction interface 13 at least two correction interfaces 13 of this channel correcting device.The another one of this channel correcting device or multiple correction interface 13 can connect respectively other coupling unit, and these coupling units are connected on other RRU.
In embodiments of the present invention, using channel correcting device as a special RRU with RRU function, in the method for channel correcting of receiving service channel, on the basis of above-described embodiment, the coupling unit being connected with the second communication interface 14 of channel correcting device, after the coupling unit correction interface by coupling unit receives radio frequency reference signal, by the coupling unit business interface of coupling unit, the radio-frequency (RF) FEEDBACK signal of radio frequency reference signal is sent to the second communication interface 14 of channel correcting device.After second communication interface 14 receives radio-frequency (RF) FEEDBACK signal, be converted to baseband feedback signal through signal conversion unit 12, and by the first communication interface 11, the BBU that sends to it to connect baseband feedback signal.
Concrete, the coupling unit being connected with other correction interfaces of channel correcting device sends to radio-frequency (RF) FEEDBACK signal respectively the step of corresponding RRU, each RRU is converted to radio-frequency (RF) FEEDBACK signal baseband feedback signal and sends to the step of connected BBU, and follow-up operating procedure, can be referring to the implementation in above-described embodiment.
In the method for the channel correcting of sending service passage, on the basis of above-described embodiment, one or more BBU that not only each RRU connects, according to the rule of the transmission base band reference signal setting in advance, utilize default time resource, frequency resource or code territory resource that base band reference signal is sent to each RRU; The BBU being connected with channel correcting device, also according to the rule of the transmission base band reference signal setting in advance, utilizes default time resource, frequency resource or code territory resource that base band reference signal is sent to this channel correcting device.After channel correcting device receives base band reference signal, base band reference signal is converted to radio frequency reference signal, and by second communication interface 14, radio frequency reference signal is sent to connected coupling unit; Coupling unit by the coupling unit correction interface on it, feeds back to connected channel correcting device by the sub-fraction in received radio frequency reference signal.
Due to can be using channel correcting device as a special RRU, therefore channel correcting device be received or the method for the channel correcting of sending service passage, can be referring to the implementation in above-described embodiment.
The structural representation of the another channel correcting device that Fig. 4 provides for the embodiment of the present invention, as shown in Figure 4, this channel correcting device also comprises along separate routes or combiner unit 15.Wherein, described shunt or combiner unit 15, be connected with described signal conversion unit 12 and described at least two correction interfaces 13 respectively.
Shunt or combiner unit, be assigned as at least two paths of signals for the radio frequency reference signal that signal conversion unit 12 is exported, at least two correction interfaces 13 described in sending to respectively; Or, merge into a road signal at least two radio-frequency (RF) FEEDBACK signals that described at least two correction interfaces 13 are received respectively, send to described signal conversion unit 12.
Concrete, between the signal conversion unit 12 and at least two correction interfaces 13 of channel correcting device inside, also comprise along separate routes or combiner unit.This shunt or combiner unit be have more than one point or the shunt of All-in-One function/close road circuit, the quantity of concrete branch road equals the quantity of correction interface 13.
After base band reference signal is converted to radio frequency reference signal by signal conversion unit 12, through this shunt or combiner unit, radio frequency reference signal is divided into at least two paths of signals, send to coupling unit by correction interface 13 respectively.
This shunt or combiner unit can have the function of signal being carried out to shunt, can also have the function of power back-off, so that the signal through-put power on each branch road after obtaining is along separate routes identical with the through-put power of shunt signal before.
After at least two correction interfaces 13 receive respectively radio-frequency (RF) FEEDBACK signal, through this shunt or combiner unit, radio-frequency (RF) FEEDBACK signal is merged into a road signal, send to signal conversion unit 12.
The channel correcting device that the embodiment of the present invention provides, by utilizing along separate routes or combiner unit and the correction interface identical with branch road quantity, realize radio frequency reference signal can have been sent to two or more coupling units simultaneously, or the radio-frequency (RF) FEEDBACK signal that at least two correction interfaces are received is merged into a road signal, can receive service channel or sending service passage carries out unified channel correcting to each of each RRU so that must be used for carrying out the BBU of channel correcting.
The structural representation of the another channel correcting device that Fig. 5 provides for the embodiment of the present invention, as shown in Figure 5, this channel correcting device comprises:
Processor 21, memory 22, bus 23, the first communication interface 24 and at least two correction interfaces 25.Between processor 21, memory 22 and communication interface 24, connect by bus 23 and complete mutual communication.
Processor 21 may be monokaryon or multinuclear CPU (Central Processing Unit, CPU), or be specific integrated circuit (Application Specific Integrated Circuit, ASIC), or for being configured to implement one or more integrated circuits of the embodiment of the present invention.
Memory 22 can be high-speed RAM memory, can be also nonvolatile memory (non-volatile memory), for example at least one magnetic disc store.
Memory 22 is for depositing program 221.Concrete, in program 221, can comprise program code, described program code comprises computer-managed instruction.
The first communication interface 24, the base band reference signal sending for receiving BBU.
Processor 21 working procedures 221, to carry out:
Described base band reference signal is converted to radio frequency reference signal;
Described radio frequency reference signal is sent to at least two coupling units, return at least two radio-frequency (RF) FEEDBACK signals of described radio frequency reference signal for described at least two coupling units.
Concrete, the channel correcting device in the embodiment of the present invention carries out the method for channel correcting, can be referring to the implementation in the device embodiment of above-mentioned correspondence, and this repeats no more.
The structural representation of the another channel correcting device that Fig. 6 provides for the embodiment of the present invention, as shown in Figure 6, this channel correcting device comprises:
Processor 31, memory 32, bus 33, the first communication interface 34 and at least two correction interfaces 35.Between processor 31, memory 32 and communication interface 34, connect by bus 33 and complete mutual communication.
Processor 31 may be monokaryon or multinuclear CPU (Central Processing Unit, CPU), or be specific integrated circuit (Application Specific Integrated Circuit, ASIC), or for being configured to implement one or more integrated circuits of the embodiment of the present invention.
Memory 32 can be high-speed RAM memory, can be also nonvolatile memory (non-volatile memory), for example at least one magnetic disc store.
Memory 32 is for depositing program 321.Concrete, in program 321, can comprise program code, described program code comprises computer-managed instruction.
The first communication interface 34, at least two radio-frequency (RF) FEEDBACK signals that send for receiving at least two coupling units.
Processor 31 working procedures 321, to carry out:
Described at least two radio-frequency (RF) FEEDBACK signals are converted to baseband feedback signal;
Described baseband feedback signal is sent to BBU.
Concrete, the channel correcting device in the embodiment of the present invention carries out the method for channel correcting, can be referring to the implementation in the device embodiment of above-mentioned correspondence, and this repeats no more.
The structural representation of the channel correcting system that Fig. 7 a provides for the embodiment of the present invention, as shown in Figure 7a, this channel correcting system comprises at least one BBU1, channel correcting device 2, at least two RRU3 and at least two coupling units 4.
Concrete, in the method for channel correcting of receiving service channel, base band reference signal is sent to channel correcting device 2 by BBU1; Base band reference signal is converted to radio frequency reference signal by channel correcting device 2, by least two correction interfaces, sends to respectively at least two coupling units 4; Two coupling units 4 pass through coupling unit business interface separately by the radio-frequency (RF) FEEDBACK signal of radio frequency reference signal respectively, send to the business interface of connected RRU3; After RRU3 receives radio-frequency (RF) FEEDBACK signal, radio-frequency (RF) FEEDBACK signal is converted to baseband feedback signal, sends to connected BBU1.
If it is upper that RRU3 and channel correcting device 2 are connected to same BBU1, radio-frequency (RF) FEEDBACK signal is sent to this BBU1 by RRU3; If RRU3 is connected on different BBU from channel correcting device 2, the BBU that RRU3 sends to it to connect radio-frequency (RF) FEEDBACK signal, after going out the estimated value of channel response of each receipts service channel according to radio-frequency (RF) FEEDBACK calculated signals by BBU, the estimated value of the channel response of each receipts service channel is sent to the BBU1 being connected with channel correcting device 2, by this BBU1, according to the estimated value of the channel response of each the receipts service channel of each RRU3, channel correcting is carried out in unification.
Wherein, RRU3 is connected to the situation on different BBU from channel correcting device 2, not shown in Fig. 5.
In the method for the channel correcting of sending service passage, upper if each RRU3 is connected to same BBU1, base band reference signal is sent at least two connected RRU3 by this BBU1; Upper if each RRU3 is connected to two or more BBU, the rule of the transmission base band reference signal being set in advance by each BBU basis, sends to each RRU3 by base band reference signal.
Each RRU3, after receiving base band reference signal, is converted to radio frequency reference signal by base band reference signal, and radio frequency reference signal is sent to connected coupling unit 4; The radio-frequency (RF) FEEDBACK signal of the radio frequency reference signal that each coupling unit 4 receives it respectively on coupling unit business interface, is sent to the correction interface of channel correcting device 2 by coupling unit correction interface; Thereby at least two correction interfaces of channel correcting device 2 receive respectively radio-frequency (RF) FEEDBACK signal, and after radio-frequency (RF) FEEDBACK signal is converted to baseband feedback signal, send to connected BBU1.
And then by the BBU1 being connected with channel correcting device according to received each baseband feedback signal, calculate the estimated value of the channel response of each the sending service passage of each RRU3, and according to the estimated value of the channel response of each the sending service passage of each RRU3, the unified channel correcting that carries out.Or by BBU1, each estimated value is sent to the BBU for carrying out channel correcting, carry out channel correcting with each the sending service passage to each RRU3.
It should be noted that, the RRU3 in the embodiment of the present invention can be two or more, and correspondingly coupling unit 4 can be two or more, only RRU3 and coupling unit 4 is respectively to the situation of two and illustrates in figure.
The structural representation of another channel correcting system that Fig. 7 b provides for the embodiment of the present invention, as shown in Figure 7b, this channel correcting system comprises at least one BBU1, channel correcting device 2, at least one RRU3 and at least two coupling units 4.
Concrete, in the method for channel correcting of receiving service channel, base band reference signal is sent to channel correcting device 2 by BBU1; Base band reference signal is converted to radio frequency reference signal by channel correcting device 2, by least two correction interfaces, sends to respectively at least two coupling units 4; Two coupling units 4 pass through coupling unit business interface separately by the radio-frequency (RF) FEEDBACK signal of radio frequency reference signal respectively, send to the business interface of connected RRU3, or send to the second communication interface of channel correcting device 2; RRU3 and channel correcting device 2 after receiving radio-frequency (RF) FEEDBACK signal, are converted to baseband feedback signal by radio-frequency (RF) FEEDBACK signal respectively, send to the BBU1 that connected separately.
If it is upper that RRU3 and channel correcting device 2 are connected to same BBU1, RRU3 and channel correcting device 2 all send to this BBU1 by radio-frequency (RF) FEEDBACK signal; If RRU3 is connected on different BBU from channel correcting device 2, the BBU that RRU3 sends to it to connect radio-frequency (RF) FEEDBACK signal, after going out the estimated value of channel response of each receipts service channel according to radio-frequency (RF) FEEDBACK calculated signals by this BBU, the estimated value of the channel response of each receipts service channel is sent to the BBU1 being connected with channel correcting device 2, by this BBU1, according to the estimated value of the channel response of each receipts service channel of RRU3 and channel correcting device 2, channel correcting is carried out in unification.
Or the BBU1 being connected with channel correcting device 2 and the BBU being connected with RRU3, can send to the BBU for carrying out channel correcting by the estimated value calculating, the receipts service channel of RRU3 is unified to proofread and correct by this BBU.
In the method for the channel correcting of sending service passage, upper if RRU3 and channel correcting device 2 are connected to same BBU1, base band reference signal is sent at least one connected RRU3 and channel correcting device 2 by BBU1; Upper if RRU3 and channel correcting device 2 are connected to two BBU, the rule of the transmission base band reference signal being set in advance by each BBU basis, sends base band reference signal.RRU3 and channel correcting device 2 after receiving base band reference signal, are converted to radio frequency reference signal by base band reference signal respectively, and radio frequency reference signal is sent to connected coupling unit 4; The radio-frequency (RF) FEEDBACK signal of the radio frequency reference signal that each coupling unit 4 receives it respectively on coupling unit business interface, is sent to the correction interface of channel correcting device 2 by coupling unit correction interface; Thereby at least two correction interfaces of channel correcting device 2 receive respectively radio-frequency (RF) FEEDBACK signal, and after radio-frequency (RF) FEEDBACK signal is converted to baseband feedback signal, send to connected BBU1.
And then by the BBU1 being connected with channel correcting device 2 according to received each baseband feedback signal, calculate the estimated value of the channel response of each the sending service passage of RRU3, and according to the estimated value of the channel response of each the receipts service channel of each RRU3, the unified channel correcting that carries out.Or each estimated value is sent to the BBU for carrying out channel correcting by BBU1, by this BBU, each the sending service passage of RRU3 carried out to unified channel correcting.
It should be noted that, the RRU3 in the embodiment of the present invention can be one or more, and correspondingly coupling unit 4 can be two or more, in figure, is only one to RRU3, and coupling unit 4 is that the situation of two illustrates.
In the rule that is preset in the transmission base band reference signal in BBU described in the various embodiments described above, can send base band reference signal for the mode that each BBU divides according to frequency division, time-division or code.
Concrete, for the BBU that carries out channel correcting, according to the estimated value of the channel response of each sending service passage of each RRU and/or channel correcting device, the method for carrying out channel correction is as follows.
The estimated value of the channel response of sending service passage is
wherein k represents the some equipment in RRU or channel correction device; I represents a certain sending service passage of this equipment.Select as required the estimated value of channel response of a sending service passage of each RRU and/or channel correcting device as fiducial value
it is the penalty coefficient of i article of sending service passage of k equipment.
The BBU being connected with channel correcting device is according to the estimated value of the channel response of each receipts service channel of each RRU and/or channel correcting device, and the method for carrying out channel correction is as follows.
The estimated value of receiving the channel response of service channel is
wherein k represents the some equipment in RRU or channel correction device; I represents that a certain of this equipment is received service channel.Select as required the estimated value of each RRU and/or channel correcting device one channel response of receiving service channel as fiducial value
it is the penalty coefficient of i article of receipts service channel of k equipment.
After calculating each the penalty coefficient of receiving service channel and each sending service passage, as follows to receiving the method that service channel and sending service passage compensate.
The BBU that is used for carrying out channel correcting is after receiving the signal of receiving service channel transmission, calculate the channel response that signal transmits on this receipts service channel, the numerical value of this channel response is multiplied by the penalty coefficient of corresponding receipts service channel, the weights of the corresponding sending service passage that obtains estimating; In the time need to utilizing sending service passage transmitted signal corresponding to this receipts service channel, the weights of the sending service passage that utilization estimates are multiplied by signal itself, be multiplied by again the penalty coefficient of corresponding sending service passage, thereby obtain through transmitting after the compensation of receipts service channel and sending service channel compensation.Like this, UE just can not perceive the inconsistency of each the sending service passage of multiple RRU, has completed the channel correcting process of multiple RRU.
The flow chart of the channel correcting method that Fig. 8 provides for the embodiment of the present invention, as shown in Figure 8, the method comprises:
101, receive the base band reference signal that BBU sends.
102, described base band reference signal is converted to radio frequency reference signal.
103, described radio frequency reference signal is sent to at least two coupling units.Execution step 103 is at least two radio-frequency (RF) FEEDBACK signals in order to return to described radio frequency reference signal for described at least two coupling units.
Further, described method can also comprise:
The radio-frequency (RF) FEEDBACK signal that a coupling unit described in reception at least two coupling units returns; Described radio-frequency (RF) FEEDBACK signal is converted to baseband feedback signal, and described baseband feedback signal is sent to described BBU.
Concrete, in the embodiment of the present invention, channel correcting device carries out the method for channel correcting, can be referring to the implementation described in the device embodiment of above-mentioned correspondence, and this repeats no more.
The flow chart of another channel correcting method that Fig. 9 provides for the embodiment of the present invention, as shown in Figure 9, the method comprises:
201, receive at least two radio-frequency (RF) FEEDBACK signals that at least two coupling units send.
202, described at least two radio-frequency (RF) FEEDBACK signals are converted to baseband feedback signal.
203, described baseband feedback signal is sent to BBU.
Further, described method can also comprise:
Receive the base band reference signal that described BBU sends; Described base band reference signal is converted to radio frequency reference signal; A coupling unit described in described radio frequency reference signal is sent at least two coupling units, so that described coupling unit returns to the radio-frequency (RF) FEEDBACK signal of described radio frequency reference signal.
Concrete, in the embodiment of the present invention, channel correcting device carries out the method for channel correcting, can be referring to the implementation described in the device embodiment of above-mentioned correspondence, and this repeats no more.
The channel correcting method that the embodiment of the present invention provides, utilize two or more correction interfaces to connect respectively two or more coupling units, by radio frequency reference signal is sent to coupling unit by each correction interface, so that must be used for carrying out the BBU of channel correcting, can obtain the estimated value of the channel response of the receipts service channel of RRU, or by each correction interface from each coupling unit received RF feedback signal, so that must be used for carrying out the BBU of channel correcting, can obtain the estimated value of the channel response of the sending service passage of RRU, thereby realize and utilize this receipts service channel or sending service passage to each RRU carries out unified channel correcting for the BBU that carries out channel correcting.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can complete by the relevant hardware of program command.Aforesaid program can be stored in a computer read/write memory medium.This program, in the time carrying out, is carried out the step that comprises above-mentioned each embodiment of the method; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: above each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (11)
1. a channel correcting device, is characterized in that, comprising: the first communication interface, signal conversion unit and at least two correction interfaces;
Described the first communication interface and indoor Base Band Unit BBU communication connection, for receiving base band reference signal from described BBU;
Described signal conversion unit is connected with described the first communication interface and described at least two correction interfaces respectively, for described base band reference signal is converted to radio frequency reference signal, and at least two correction interfaces described in described radio frequency reference signal is sent to;
Described at least two correction interfaces respectively with the communication connection of at least two coupling units, at least two coupling units described in described radio frequency reference signal is sent to respectively.
2. channel correcting device according to claim 1, is characterized in that, described channel correcting device also comprises at least one the second communication interface being connected with described signal conversion unit;
A coupling unit communication connection in described at least one second communication interface and described at least two coupling units, the radio-frequency (RF) FEEDBACK signal returning for receiving described coupling unit, and described radio-frequency (RF) FEEDBACK signal is sent to described signal conversion unit;
Correspondingly, described signal conversion unit also for, described radio-frequency (RF) FEEDBACK signal is converted to baseband feedback signal, and described baseband feedback signal is sent to described the first communication interface, for described the first communication interface, described baseband feedback signal is sent to described BBU.
3. channel correcting device according to claim 1 and 2, is characterized in that, described channel correcting device also comprises along separate routes or combiner unit;
Described shunt or combiner unit, be connected with described signal conversion unit and described at least two correction interfaces respectively, for the radio frequency reference signal of signal conversion unit output is assigned as at least two paths of signals, at least two correction interfaces described in sending to respectively.
4. a channel correcting device, is characterized in that, comprising: the first communication interface, signal conversion unit and at least two correction interfaces;
Described at least two correction interfaces, respectively with the communication connection of at least two coupling units, at least two at least two radio-frequency (RF) FEEDBACK signals that coupling unit sends respectively described in receiving;
Described signal conversion unit is connected with described at least two correction interfaces and described the first communication interface respectively, for described at least two radio-frequency (RF) FEEDBACK signals are converted to baseband feedback signal, and described baseband feedback signal is sent to described the first communication interface;
Described the first communication interface and BBU communication connection, for sending to described BBU by described baseband feedback signal.
5. channel correcting device according to claim 4, it is characterized in that, described channel correcting device also comprises at least one the second communication interface being connected with described signal conversion unit, a coupling unit communication connection in described at least one second communication interface and described at least two coupling units;
Correspondingly, described the first communication interface also for, receive base band reference signal from described BBU; Described signal conversion unit also for, described base band reference signal is converted to radio frequency reference signal, and sends to described at least one second communication interface; Described at least one second communication interface is used for, and described radio frequency reference signal is sent to described coupling unit, so that described coupling unit returns to the radio-frequency (RF) FEEDBACK signal of described radio frequency reference signal to a correction interface in described at least two correction interfaces.
6. according to the channel correcting device described in claim 4 or 5, it is characterized in that, described channel correcting device also comprises along separate routes or combiner unit;
Described shunt or combiner unit, be connected with described signal conversion unit and described at least two correction interfaces respectively, merge into a road signal at least two radio-frequency (RF) FEEDBACK signals that described at least two correction interfaces are received respectively, send to described signal conversion unit.
7. a channel correcting method, is characterized in that, comprising:
Receive the base band reference signal that BBU sends;
Described base band reference signal is converted to radio frequency reference signal;
Described radio frequency reference signal is sent to at least two coupling units, return at least two radio-frequency (RF) FEEDBACK signals of described radio frequency reference signal for described at least two coupling units.
8. channel correcting method according to claim 7, is characterized in that, described method also comprises:
The radio-frequency (RF) FEEDBACK signal that a coupling unit described in reception at least two coupling units returns;
Described radio-frequency (RF) FEEDBACK signal is converted to baseband feedback signal, and described baseband feedback signal is sent to described BBU.
9. a channel correcting method, is characterized in that, comprising:
Receive at least two radio-frequency (RF) FEEDBACK signals that at least two coupling units send;
Described at least two radio-frequency (RF) FEEDBACK signals are converted to baseband feedback signal;
Described baseband feedback signal is sent to BBU.
10. channel correcting method according to claim 9, is characterized in that, described method also comprises:
Receive the base band reference signal that described BBU sends;
Described base band reference signal is converted to radio frequency reference signal;
A coupling unit described in described radio frequency reference signal is sent at least two coupling units, so that described coupling unit returns to the radio-frequency (RF) FEEDBACK signal of described radio frequency reference signal.
11. 1 kinds of channel correcting systems, it is characterized in that, comprise at least one BBU, as the channel correcting device as described in arbitrary in claim 1-3 or as channel correcting device, at least one radio frequency remote unit RRU and at least two coupling units as described in arbitrary in claim 4-6; Between described BBU, described channel correcting device, described RRU and described coupling unit, communicate to connect.
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