CN103428125A - Method, related device and system for correcting channels among far-end radio frequency units - Google Patents

Method, related device and system for correcting channels among far-end radio frequency units Download PDF

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CN103428125A
CN103428125A CN2013103608086A CN201310360808A CN103428125A CN 103428125 A CN103428125 A CN 103428125A CN 2013103608086 A CN2013103608086 A CN 2013103608086A CN 201310360808 A CN201310360808 A CN 201310360808A CN 103428125 A CN103428125 A CN 103428125A
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transmission channel
receive path
channel
passage
rru
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张超超
易雄书
刘云
陈卫民
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Huawei Technologies Co Ltd
Shanghai Huawei Technologies Co Ltd
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Shanghai Huawei Technologies Co Ltd
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Abstract

An embodiment of the invention discloses a method, a related device and a system for correcting channels among far-end radio frequency units. The method for correcting the channels among the far-end radio frequency units comprises the steps of respectively transmitting correcting signals on M transmitting channels of N far-end radio frequency units, wherein working frequency points of the M transmitting channels are identical to working frequency points of correcting receiving channels; receiving the correcting signals which are transmitted by on the M transmitting channels and looped back by the correcting receiving channels; respectively calculating time delay compensation factors of the M transmitting channels according to the received correcting signals which are transmitted by on the M transmitting channels and looped back by the correcting receiving channels; respectively performing channel correction to the M transmitting channels according to the time delay compensation factors of the M transmitting channels so as to enable time delay of the M transmitting channels to be identical. By means of the technical scheme, the time delay consistency of the transmitting channels (and/or receiving channels) of multiple far-end radio frequency units can be achieved.

Description

Channel correcting method between remote radio unit (RRU), relevant apparatus and system
Technical field
The present invention relates to the communications field, relate in particular to channel correcting method, relevant device and system between a kind of remote radio unit (RRU).
Background technology
At Long Term Evolution (LTE, Long Term Evolution) Frequency Division Duplexing (FDD) (FDD, Frequency Division Duplex) in system, introduced the multiplexing multichannel input and output of closed loop (CL-MIMO, Closed-Loop Multiple-Input Multiple-Output) data-transmission mode, under this transmission mode, terminal is selected certain precoding matrix indicators (PMI wherein according to certain criterion, Precoding Matrix Indication), then report base station (BS, Base Station), BS selects corresponding pre-coding matrix to be weighted the downlink data according to the PMI of terminal to report, thereby the optimum that reaches system is handled up.
In CL-MIMO transmission, transmitter can adopt 2T2R(i.e. two transmission channels and two receive paths) structure or 4T4R(i.e. 4 transmission channels and 4 receive paths) structure, in commercial LTE network, most of what adopt is the 2T2R structure.If along with going deep into of the market demand, need the 4T4R structure, have so two schemes, the first is directly used the remote radio unit (RRU) (RRU of 4T4R, Remote Radio Unit) replace the RRU of existing 2T2R, it two is to adopt two RRU Two bors d's oeuveres to become the RRU of a 4T4R.For the first string, the RRU of 2T2R is replaced, and the expensive factor of the RRU of 4T4R all can limit the realization of this scheme, for second scheme, because the delay inequality between the passage of different RRUs may be larger and unstable, this can cause the decline of CL-MIMO performance, therefore need to do the channel correcting between different RRUs, so that the time delay between the passage of different RRUs is consistent.
Collaborative multicast communication (CoMP, Coordinative Multiple Point) is the key characteristic of LTE, utilizes the CoMP technology can effectively resist the interference problem of LTE cell edge.Combine transmission (JT, Joint Transmission) technology a kind of as the CoMP technology, can significantly improve cell edge and on average handle up.For in Frequency Division Duplexing (FDD) (FDD, Frequency Division Duplex) system, realize the gain that the JT technology is brought, need to carry out channel correcting equally.From this angle, need between all RRU of CoMP community, carry out channel correcting.
Only there is the channel correcting method of the single RRU under fdd mode in prior art, do not find the channel correcting scheme between RRU temporarily.The consistency of the channel time delay of RRU in the time of can't realizing Two bors d's oeuveres due to the channel correcting of single RRU, for collaborative multicast communication (CoMP, Coordinative Multiple Point) scene can't be accomplished the consistency of channel time delay equally, now can affect the systematic function of CL-MIMO or CoMP.
Summary of the invention
The embodiment of the present invention provides channel correcting method, relevant apparatus and the system between a kind of a plurality of remote radio unit (RRU), for realizing the channel time delay consistency of a plurality of remote radio unit (RRU)s.
For solving the problems of the technologies described above, the embodiment of the present invention provides following technical scheme:
First aspect present invention provides the channel correcting method between a kind of remote radio unit (RRU), in the communication system that is applied to comprise N remote radio unit (RRU), in an above-mentioned N remote radio unit (RRU), have at least a remote radio unit (RRU) to comprise and proofread and correct the receipts passage, above-mentioned channel correcting method comprises:
Launch correction signal respectively on M transmission channel of an above-mentioned N remote radio unit (RRU), wherein, the working frequency points of an above-mentioned M transmission channel is identical with the working frequency points that passage is received in above-mentioned correction, above-mentioned N > 1, above-mentioned M > 1;
Receive above-mentioned correction and receive the correction signal of launching of passage loopback on an above-mentioned M transmission channel;
Receive the correction signal of launching of passage loopback according to the above-mentioned correction received on an above-mentioned M transmission channel, calculate respectively the delay compensation coefficient of an above-mentioned M transmission channel;
According to the delay compensation coefficient of an above-mentioned M transmission channel, respectively an above-mentioned M transmission channel is carried out to channel correcting, so that the time delay between an above-mentioned M transmission channel is consistent.
Based on first aspect present invention, in the first, in possible implementation, the correction signal of launching on an above-mentioned M transmission channel of passage loopback is received in the above-mentioned correction that above-mentioned basis receives, and calculates respectively the delay compensation coefficient of an above-mentioned M transmission channel, comprising:
Receive the correction signal of launching of passage loopback according to the above-mentioned correction received on an above-mentioned M transmission channel, an above-mentioned M transmission channel is carried out to channel estimating, obtain the channel response value of an above-mentioned M transmission channel;
According to the channel response value of an above-mentioned M transmission channel, calculate respectively the delay inequality of each transmission channel and benchmark transmission channel, wherein, the said reference transmission channel is in an above-mentioned M transmission channel;
By above-mentioned each transmission channel of calculating and the delay inequality of said reference transmission channel, respectively as the delay compensation coefficient of above-mentioned each transmission channel.
The implementation that the first based on first aspect present invention is possible, at the second in possible implementation, the above-mentioned channel response value according to an above-mentioned M transmission channel, calculate respectively the delay inequality of each transmission channel and said reference transmission channel, comprising:
According to the channel response value of an above-mentioned M transmission channel, calculate respectively the phase difference of each transmission channel and said reference transmission channel on frequency domain;
According to the phase difference of above-mentioned each transmission channel and said reference transmission channel, calculate the delay inequality of above-mentioned each transmission channel and said reference transmission channel.
Based on first aspect present invention, the perhaps possible implementation of the first of first aspect present invention, the perhaps possible implementation of the second of first aspect present invention, at the third in possible implementation, above-mentionedly launch correction signal respectively on M transmission channel of an above-mentioned N remote radio unit (RRU), be specially:
Adopt the frequency division mode to launch correction signal respectively on M transmission channel of an above-mentioned N remote radio unit (RRU);
Perhaps,
Adopt code minute mode to launch correction signal respectively on M transmission channel of an above-mentioned N remote radio unit (RRU).
Second aspect present invention provides the channel correcting method between a kind of remote radio unit (RRU), in the communication system that is applied to comprise N remote radio unit (RRU), in an above-mentioned N remote radio unit (RRU), have at least a remote radio unit (RRU) to comprise and proofread and correct a passage, above-mentioned channel correcting method comprises:
Send out passage emission correction signal in above-mentioned correction;
Receive an above-mentioned N remote radio unit (RRU) M receive path loopback send out the correction signal of launching on passage in above-mentioned correction, wherein, the working frequency points that the working frequency points of an above-mentioned M receive path is sent out passage with above-mentioned correction is identical, above-mentioned N > 1, above-mentioned M > 1;
According to above-mentioned M the receive path loopback received send out the correction signal of launching on passage in above-mentioned correction, calculate respectively the delay compensation coefficient of an above-mentioned M receive path;
According to the delay compensation coefficient of an above-mentioned M receive path, respectively an above-mentioned M receive path is carried out to channel correcting, so that the time delay between an above-mentioned M receive path is consistent.
Based on second aspect present invention, in the first in possible implementation, above-mentioned M the receive path loopback that above-mentioned basis receives send out the correction signal of launching on passage in above-mentioned correction, calculate respectively the delay compensation coefficient of an above-mentioned M receive path, comprising:
According to above-mentioned M the receive path loopback received send out the correction signal of launching on passage in above-mentioned correction, an above-mentioned M receive path is carried out to channel estimating, obtain the channel response value of an above-mentioned M receive path;
According to the channel response value of an above-mentioned M receive path, calculate respectively the delay inequality of each receive path and benchmark receive path, wherein, the said reference receive path is in an above-mentioned M receive path;
By above-mentioned each receive path of calculating and the delay inequality of said reference receive path, respectively as the delay compensation coefficient of above-mentioned each receive path.
The implementation that the first based on second aspect present invention is possible, at the second in possible implementation, the above-mentioned channel response value according to an above-mentioned M receive path, calculate respectively the delay inequality of each receive path and said reference receive path, comprising:
According to the channel response value of an above-mentioned M receive path, calculate respectively the phase difference of each receive path and said reference receive path on frequency domain;
According to the phase difference of above-mentioned each receive path and said reference receive path, calculate the delay inequality of above-mentioned each receive path and said reference receive path.
Third aspect present invention provides a kind of channel correcting device, in the communication system that is applied to comprise N remote radio unit (RRU), in an above-mentioned N remote radio unit (RRU), has at least a remote radio unit (RRU) to comprise and proofreaies and correct the receipts passage, and above-mentioned channel correcting device comprises:
Transmitter unit, for launching correction signal respectively on M transmission channel of an above-mentioned N remote radio unit (RRU), wherein, the working frequency points of an above-mentioned M transmission channel is identical with the working frequency points that passage is received in above-mentioned correction, above-mentioned N > 1, above-mentioned M > 1;
Receiving element, for receiving the correction signal of launching on an above-mentioned M transmission channel of above-mentioned correction receipts passage loopback;
Computing unit, receive the correction signal of launching on an above-mentioned M transmission channel of passage loopback for the above-mentioned correction received according to above-mentioned receiving element, calculate respectively the delay compensation coefficient of an above-mentioned M transmission channel;
The channel correcting unit, for the delay compensation coefficient according to an above-mentioned M transmission channel, carry out channel correcting to an above-mentioned M transmission channel respectively, so that the time delay between an above-mentioned M transmission channel is consistent.
Based on third aspect present invention, in the first, in possible implementation, above-mentioned computing unit comprises:
The first sub-computing unit, receive the correction signal of launching of passage loopback on an above-mentioned M transmission channel for the above-mentioned correction received according to above-mentioned receiving element, an above-mentioned M transmission channel is carried out to channel estimating, obtain the channel response value of an above-mentioned M transmission channel;
The second sub-computing unit, channel response value for above-mentioned M transmission channel calculating according to the above-mentioned first sub-computing unit, calculate respectively the delay inequality of each transmission channel and benchmark transmission channel, wherein, the said reference transmission channel is in an above-mentioned M transmission channel;
Above-mentioned each transmission channel that above-mentioned computing unit calculates the above-mentioned second sub-computing unit and the delay inequality of said reference transmission channel, respectively as the delay compensation coefficient of above-mentioned each transmission channel.
The implementation that the first based on third aspect present invention is possible, at the second in possible implementation, the above-mentioned second sub-computing unit specifically for: according to the channel response value of an above-mentioned M transmission channel, calculate respectively the phase difference of each transmission channel and said reference transmission channel on frequency domain; According to the phase difference of above-mentioned each transmission channel and said reference transmission channel, calculate the delay inequality of above-mentioned each transmission channel and said reference transmission channel.
Based on third aspect present invention, the perhaps possible implementation of the first of third aspect present invention, the perhaps possible implementation of the second of third aspect present invention, at the third in possible implementation, above-mentioned transmitter unit specifically for: adopt frequency division mode or a code minute mode to launch correction signal respectively on M transmission channel of an above-mentioned N remote radio unit (RRU).
Fourth aspect present invention provides a kind of channel correcting device, in the communication system that is applied to comprise N remote radio unit (RRU), in an above-mentioned N remote radio unit (RRU), has at least a remote radio unit (RRU) to comprise and proofreaies and correct a passage, and above-mentioned channel correcting device comprises:
Transmitter unit, for sending out passage emission correction signal in above-mentioned correction;
Receiving element, for receive an above-mentioned N remote radio unit (RRU) M receive path loopback send out the correction signal of launching on passage in above-mentioned correction, wherein, the working frequency points that the working frequency points of an above-mentioned M receive path is sent out passage with above-mentioned correction is identical, above-mentioned N > 1, above-mentioned M > 1;
Computing unit, for above-mentioned M receive path loopback receiving according to above-mentioned receiving element send out the correction signal of launching on passage in above-mentioned correction, calculate respectively the delay compensation coefficient of an above-mentioned M receive path;
The channel correcting unit, the delay compensation coefficient for above-mentioned M receive path calculating according to computing unit, carry out channel correcting to an above-mentioned M receive path respectively, so that the time delay between an above-mentioned M receive path is consistent.
Based on fourth aspect present invention, in the first, in possible implementation, above-mentioned computing unit comprises:
The first sub-computing unit, send out the correction signal of launching on passage for above-mentioned M receive path loopback receiving according to above-mentioned receiving element in above-mentioned correction, an above-mentioned M receive path is carried out to channel estimating, obtain the channel response value of an above-mentioned M receive path;
The second sub-computing unit, channel response value for above-mentioned M receive path calculating according to the above-mentioned first sub-computing unit, calculate respectively the delay inequality of each receive path and benchmark receive path, wherein, the said reference receive path is in an above-mentioned M receive path;
Above-mentioned each receive path that above-mentioned computing unit calculates the above-mentioned second sub-computing unit and the delay inequality of said reference receive path, respectively as the delay compensation coefficient of above-mentioned each transmission channel.
The implementation that the first based on fourth aspect present invention is possible, at the second in possible implementation, the above-mentioned second sub-computing unit specifically for: according to the channel response value of an above-mentioned M receive path, calculate respectively the phase difference of each receive path and said reference receive path on frequency domain; According to the phase difference of above-mentioned each receive path and said reference receive path, calculate the delay inequality of above-mentioned each receive path and said reference receive path.
Fifth aspect present invention provides a kind of channel correcting system, comprising:
N remote radio unit (RRU), the first passage means for correcting be connected with an above-mentioned N remote radio unit (RRU), and the second channel means for correcting be connected with an above-mentioned N remote radio unit (RRU);
Wherein, in an above-mentioned N remote radio unit (RRU), have at least a remote radio unit (RRU) to comprise and proofread and correct the receipts passage, and have at least a remote radio unit (RRU) to comprise a correction passage;
Above-mentioned first passage means for correcting, be used for: launch correction signal respectively on M transmission channel of an above-mentioned N remote radio unit (RRU), wherein, the working frequency points of an above-mentioned M transmission channel is identical with the working frequency points that passage is received in above-mentioned correction, above-mentioned N > 1, above-mentioned M > 1; Receive above-mentioned correction and receive the correction signal of launching of passage loopback on an above-mentioned M transmission channel; Receive the correction signal of launching of passage loopback according to the above-mentioned correction received on an above-mentioned M transmission channel, calculate respectively the delay compensation coefficient of an above-mentioned M transmission channel; According to the delay compensation coefficient of an above-mentioned M transmission channel, respectively an above-mentioned M transmission channel is carried out to channel correcting, so that the time delay between an above-mentioned M transmission channel is consistent;
Above-mentioned second channel means for correcting, for: passage emission correction signal sent out in above-mentioned correction; Receive an above-mentioned N remote radio unit (RRU) M receive path loopback send out the correction signal of launching on passage in above-mentioned correction, wherein, the working frequency points that the working frequency points of an above-mentioned M receive path is sent out passage with above-mentioned correction is identical; According to above-mentioned M the receive path loopback received send out the correction signal of launching on passage in above-mentioned correction, calculate respectively the delay compensation coefficient of an above-mentioned M receive path; According to the delay compensation coefficient of an above-mentioned M receive path, respectively an above-mentioned M receive path is carried out to channel correcting, so that the time delay between an above-mentioned M receive path is consistent.
Therefore, receive passage (and/or proofread and correct and send out passage) by arranging to proofread and correct in the embodiment of the present invention, and the working frequency points that makes proofread and correct to receive passage identical with the working frequency points of the transmission channel of RRU (and/or the working frequency points of receive path that makes to proofread and correct the working frequency points of a passage and RRU is identical), thereby make proofread and correct to receive passage can loopback in the correction signal of the transmission channel emission of different RRUs, the delay compensation coefficient that calculates the transmission channel of different RRUs according to the correction signal of loopback (and/or makes the receive path of different RRUs proofreading and correct the correction signal of sending out the passage emission by loopback, calculate the delay compensation coefficient at the receive path of different RRUs according to the correction signal of loopback), realize the channel correcting of the transmission channel (and/or receive path) between different RRUs, thereby realized the time delay consistency of the transmission channel (and/or receive path) of a plurality of remote radio unit (RRU)s.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is embodiment schematic flow sheet of a kind of channel correcting method provided by the invention;
Fig. 2 is another embodiment schematic flow sheet of a kind of channel correcting method provided by the invention;
Fig. 3 is a kind of RRU Two bors d's oeuveres communication system example structure schematic diagram provided by the invention;
Fig. 4 is example structure schematic diagram of a kind of channel correcting device provided by the invention;
Fig. 5 is another example structure schematic diagram of a kind of channel correcting device provided by the invention;
Fig. 6 is example structure schematic diagram of a kind of channel correcting system provided by the invention.
Embodiment
The embodiment of the present invention provides channel correcting method, relevant apparatus and the system between a kind of remote radio unit (RRU).
For making goal of the invention of the present invention, feature, advantage can be more obvious and understandable, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, but not whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
Below take to the transmitting channel correction between RRU is example, and the channel correcting method between a kind of remote radio unit (RRU) in the embodiment of the present invention (being RRU) is described.In the communication system that channel correcting method in the embodiment of the present invention is applied to comprise N RRU, and, in the communication system of an above-mentioned N RRU, have at least a RRU to comprise and proofread and correct the receipts passage, as shown in Figure 1, the channel correcting method in the embodiment of the present invention comprises:
101, launch correction signal respectively on M the transmission channel of N RRU;
Wherein, the working frequency points of an above-mentioned M transmission channel is identical with the working frequency points that passage is received in above-mentioned correction, N > 1, M > 1.
In the embodiment of the present invention, the channel correcting device is connected with N RRU respectively, each RRU includes transmission channel, the channel correcting device is launched correction signal respectively on M the transmission channel of N RRU, wherein, an above-mentioned M transmission channel can be all transmission channels that N RRU comprises, illustrate, if 3 RRU are arranged, each RRU comprises 2 transmission channels, and 3 RRU amount to and comprise 6 transmission channels, so, above-mentioned M can equal 6, and the channel correcting device is launched correction signal respectively on these 6 transmission channels; Perhaps, an above-mentioned M transmission channel can only comprise the transmission channel that need to carry out channel correcting, take above-mentioned example as example, only suppose in 6 transmission channels that 3 RRU comprise to carry out channel correcting to 4 transmission channels wherein, above-mentioned M equals 4, and the channel correcting device is launched correction signal respectively on these 4 transmission channels.
In embodiments of the present invention, the channel correcting device can adopt frequency division mode, code minute mode or alternate manner to launch correction signal respectively on an above-mentioned M transmission channel, wherein, the correction signal that the channel correcting device is launched on an above-mentioned M transmission channel can be identical, also can be different, above-mentioned correction signal can be for example public reference signal (CRS, Common Reference Signal), can be also the redesign other there is the correction signal of good characteristic, be not construed as limiting herein.
102, receive the correction signal of launching that the passage loopback is received in above-mentioned correction on an above-mentioned M transmission channel;
In the embodiment of the present invention, the channel correcting device is received passage with correction and is connected, owing to proofreading and correct, the working frequency points of receiving passage is identical with the working frequency points of above-mentioned transmission channel, the correction signal that the channel correcting device is launched on an above-mentioned M transmission channel is looped back to proofread and correct through eating dishes without rice or wine between antenna receives passage, proofreaies and correct the receipts passage correction signal received is fed to the channel correcting device.Illustrate, suppose in step 101, the channel correcting device is launched correction signal on 4 transmission channels, supposes to be respectively s 1, s 2, s 3And s 4Now the channel correcting device will receive and proofread and correct 4 correction signals receiving the passage loopback, due to reasons such as channel fadings in transmitting procedure, 4 correction signals that the channel correcting device receives and 4 correction signals of launching before are difference to some extent, that is 4 correction signals that, now the channel correcting device receives will be respectively s 1', s 2', s 3' and s 4'.
103, receive the correction signal of launching of passage loopback according to the above-mentioned correction received on an above-mentioned M transmission channel, calculate respectively the delay compensation coefficient of an above-mentioned M transmission channel;
In embodiments of the present invention, the correction signal of passage loopback is received in the correction that the channel correcting device can receive according to step 102, an above-mentioned M transmission channel is carried out respectively to channel estimating, obtain the channel response value of an above-mentioned M transmission channel, afterwards according to the channel response value of an above-mentioned M transmission channel, calculate respectively the delay inequality of each transmission channel and benchmark transmission channel on frequency domain or time domain, and by above-mentioned each transmission channel of calculating and the delay inequality of benchmark transmission channel, respectively as the delay compensation coefficient of above-mentioned each transmission channel, wherein, the said reference transmission channel is in an above-mentioned M transmission channel, in step 103, the delay compensation coefficient of benchmark transmission channel is 1.Wherein, can determine from an above-mentioned M transmission channel according to certain principle in the embodiment of the present invention that a transmission channel is as the benchmark transmission channel, for example, can determine from an above-mentioned M transmission channel that according to the time delay minimum principle transmission channel is as the benchmark transmission channel, perhaps, also can determine from an above-mentioned M transmission channel at random that a transmission channel, as the benchmark transmission channel, is not construed as limiting herein.
When the channel correcting device calculates the delay inequality of each transmission channel and benchmark transmission channel according to the channel response value of an above-mentioned M transmission channel on frequency domain, the channel correcting device is at first according to the channel response value of an above-mentioned M transmission channel, calculate respectively the phase difference of each transmission channel and benchmark transmission channel on frequency domain, afterwards according to the conversion formula of phase place and time delay, according to the phase difference of each transmission channel calculated and benchmark transmission channel, calculate the delay inequality of each transmission channel and benchmark transmission channel.Illustrate, suppose in step 101, the channel correcting device is launched respectively correction signal s on transmission channel 1～4 1, s 2, s 3And s 4, the channel correcting device receives correction signal s in step 102 1', s 2', s 3' and s 4', wherein, s 1' be s 1Receive the eat dishes without rice or wine signal of loopback of interchannel antenna, s through transmission channel 1 with proofreading and correct 2' be s 2Receive the eat dishes without rice or wine signal of loopback of interchannel antenna, s through transmission channel 2 with proofreading and correct 3' be s 3Receive the eat dishes without rice or wine signal of loopback of interchannel antenna, s through transmission channel 3 with proofreading and correct 4' be s 4Receive the eat dishes without rice or wine signal of loopback of interchannel antenna through transmission channel 4 with proofreading and correct.The correction signal of passage loopback is received in the correction that at first the channel correcting device receives according to step 102, transmission channel 1～4 is carried out respectively to channel estimating, for example, the correction signal that receives is carried out to conjugate multiplication (that is, by s previously in the correction signal of launching on respective channel 1' and s 1Carry out conjugate multiplication, by s 2' and s 2Carry out conjugate multiplication, s 3' and s 3Carry out conjugate multiplication, s 4' and s 4Carry out conjugate multiplication), the least square (LS, Least Square) that obtains the channel response of each transmission channel is estimated, and then, by processing such as noise reductions, is obtained the channel response value of transmission channel 1～4.Take the LTE system as example, suppose by h (1, k) mean the channel response value of k subcarrier of transmission channel 1, h (2, k) mean the channel response value of k subcarrier of transmission channel 2, h (3, k) mean the channel response value of k subcarrier of transmission channel 3, (4, k) the channel response value of k subcarrier of expression transmission channel 4, using transmission channel 1 as the benchmark transmission channel for h, by h (2, k) and h (1, k) do conjugate multiplication and process, obtain the phase difference △ θ that on transmission channel 2 and transmission channel 1, subcarrier is k 2(k), then on all subcarriers, calculate the △ θ of an equivalence 2, by that analogy, by h (3, k) and h (1, k) do conjugate multiplication and process, obtain the phase difference △ θ that on transmission channel 3 and transmission channel 1, subcarrier is k 3(k), then on all subcarriers, calculate the △ θ of an equivalence 3, by h (4, k) and h (1, k) do conjugate multiplication and process, obtain the phase difference △ θ that on transmission channel 4 and transmission channel 1, subcarrier is k 4(k), then on all subcarriers, calculate the △ θ of an equivalence 4.Finally according to △ θ 2, △ θ 3With △ θ 4, and the conversion formula of phase place and time delay
Figure BDA0000367924630000101
Can obtain the delay inequality △ τ of transmission channel 2 and transmission channel 1 2, the delay inequality △ τ of transmission channel 3 and transmission channel 1 3, the delay inequality △ τ of transmission channel 4 and transmission channel 1 4, wherein, at formula
Figure BDA0000367924630000102
In, f means the frequency domain width of subcarrier, afterwards by △ τ 2, △ τ 3With △ τ 4Respectively as transmission channel 2, the delay compensation coefficient of transmission channel 3 and transmission channel 4, the delay compensation coefficient of transmission channel 1 is 1.
When the channel correcting device calculates the delay inequality of each transmission channel and benchmark transmission channel according to the channel response value of an above-mentioned M transmission channel on time domain, the channel correcting device arrives time domain by Fourier transform by the channel response value transform of an above-mentioned M transmission channel, then on time domain, calculates the delay inequality of each transmission channel and benchmark transmission channel.Illustrate, suppose in step 101, the channel correcting device is launched respectively correction signal s on transmission channel 1～4 1, s 2, s 3And s 4, the channel correcting device receives correction signal s in step 102 1', s 2', s 3' and s 4', wherein, s 1' be s 1Receive the eat dishes without rice or wine signal of loopback of interchannel antenna, s through transmission channel 1 with proofreading and correct 2' be s 2Receive the eat dishes without rice or wine signal of loopback of interchannel antenna, s through transmission channel 2 with proofreading and correct 3' be s 3Receive the eat dishes without rice or wine signal of loopback of interchannel antenna, s through transmission channel 3 with proofreading and correct 4' be s 4Receive the eat dishes without rice or wine signal of loopback of interchannel antenna through transmission channel 4 with proofreading and correct.The correction signal of passage loopback is received in the correction that at first the channel correcting device receives according to step 102, transmission channel 1～4 is carried out respectively to channel estimating, for example, the correction signal that receives is carried out to conjugate multiplication (that is, by s previously in the correction signal of launching on corresponding transmission channel 1' and s 1carry out conjugate multiplication, s2 ' and s2 are carried out to conjugate multiplication, s 3' and s 3carry out conjugate multiplication, s 4' and s 4carry out conjugate multiplication), obtain the least square (LS of the channel response of each transmission channel, Least Square) estimate, and then by processing such as noise reductions, obtain the channel response value of transmission channel 1～4, suppose by h (1, k) mean the channel response value of k subcarrier of transmission channel 1, h (2, k) mean the channel response value of k subcarrier of transmission channel 2, h (3, k) mean the channel response value of k subcarrier of transmission channel 3, h (4, k) mean the channel response value of k subcarrier of transmission channel 4, using transmission channel 1 as the benchmark transmission channel, the channel correcting device by Fourier transform respectively by h (1, k), h (2, k), h (3, k) and h (4, k) transform to time domain, be designated as respectively h (1, n), h (2, n), h (3, n) and h (4, n), wherein, n means the time domain sampling point, afterwards at h (1, n) upper search maximum norm value, using this maximum norm value, corresponding time domain is supported the time delay τ of point as transmission channel 1 1, h (2, n) upper search maximum norm value, using this maximum norm value, corresponding time domain sampling point is as the time delay τ of transmission channel 2 2, h (3, n) upper search maximum norm value, using this maximum norm value, corresponding time domain sampling point is as the time delay τ of transmission channel 3 3, h (4, n) upper search maximum norm value, using this maximum norm value, corresponding time domain sampling point is as the time delay △ τ of transmission channel 4 3, by τ 2with τ 1subtract each other, obtain the delay inequality △ τ of transmission channel 2 and transmission channel 1 2, by τ 3with τ 1subtract each other, obtain the delay inequality △ τ of transmission channel 3 and transmission channel 1 3, by △ τ 3with τ 1subtract each other, obtain the delay inequality △ θ of transmission channel 4 and transmission channel 1 4, afterwards by △ τ 2, △ τ 3with △ τ 4respectively as transmission channel 2, the delay compensation coefficient of transmission channel 3 and transmission channel 4, the delay compensation coefficient of transmission channel 1 is 1.
104, according to the delay compensation coefficient of an above-mentioned M transmission channel, respectively an above-mentioned M transmission channel is carried out to channel correcting, so that the time delay between an above-mentioned M transmission channel is consistent;
In the embodiment of the present invention, the channel correcting device, after obtaining the delay compensation coefficient, can carry out channel correcting to an above-mentioned M transmission channel on time domain, or, also can on frequency domain, to an above-mentioned M transmission channel, carry out channel correcting, be not construed as limiting herein.
Illustrate, suppose that the delay compensation coefficient of j the transmission channel of i RRU calculating in step 103 is β i,j, j the transmission channel of i RRU being carried out to channel correcting can be designated as:
Figure BDA0000367924630000121
, wherein, h i,jThe frequency domain response that means j the transmission channel of front i the RRU of channel correcting,
Figure BDA0000367924630000122
The frequency domain response of j the transmission channel of i RRU after the expression channel correcting.
It should be noted that, channel correcting method in the embodiment of the present invention can be applied to FDD system, CoMP system or other adopts in the communication system of a plurality of RRU, channel correcting device in the embodiment of the present invention can be baseband processing unit (BBU, Base band Unit), can be also the device that is independent of BBU, be not construed as limiting herein.
Therefore, receive passage by arranging to proofread and correct in the embodiment of the present invention, and make the working frequency points of correction receipts passage identical with the working frequency points of the transmission channel of RRU, thereby make proofread and correct to receive passage can loopback in the correction signal of the transmission channel emission of different RRUs, calculate the delay compensation coefficient of the transmission channel of different RRUs according to the correction signal of loopback, realize the channel correcting of the transmission channel between different RRUs, thereby realized the transmission channel time delay consistency of a plurality of remote radio unit (RRU)s.
Below take to the receiving channels calibration between RRU is example, and the channel correcting method between a kind of remote radio unit (RRU) in the embodiment of the present invention (being RRU) is described.In the communication system that channel correcting method in the embodiment of the present invention is applied to comprise N RRU, and, in the communication system of an above-mentioned N RRU, have at least a RRU to comprise and proofread and correct a passage, as shown in Figure 2, the channel correcting method in the embodiment of the present invention comprises:
201, send out passage emission correction signal in above-mentioned correction;
In the embodiment of the present invention, the channel correcting device is connected with N RRU respectively, and each RRU includes receive path, wherein, has at least a RRU to include and proofreaies and correct a passage, and the channel correcting device is sent out passage emission correction signal in above-mentioned correction.
In embodiments of the present invention, above-mentioned correction signal for example can analog subscriber equipment (UE, User Equipment) producing its parameter of Sounding RS(can be configured from base band) or demodulated reference signal (DMRS, De Modulation Reference Signal) signal is as correction signal, also can design the correction signal that other have good characteristic, be not construed as limiting herein.
202, M the receive path loopback of reception N RRU of institute sends out the correction signal of launching on passage in above-mentioned correction;
Wherein, the working frequency points that the working frequency points of an above-mentioned M receive path is sent out passage with above-mentioned correction is identical, N > 1, M > 1.
In the embodiment of the present invention, owing to proofreading and correct, the working frequency points of sending out passage is identical with the working frequency points of an above-mentioned M receive path, the channel correcting device is sent out the above-mentioned M receive path of eating dishes without rice or wine to be looped back between the correction signal process antenna of launching on passage in above-mentioned correction, an above-mentioned M receive path is fed to the channel correcting device by the correction signal received respectively.Illustrate, suppose that M equals 4, in step 101, the channel correcting device is sent out on passage and is launched correction signal in correction, be assumed to be s, due to the channel difference of each receive path, the channel correcting device receives the correction signal of above-mentioned 4 receive path loopbacks and incites somebody to action difference to some extent, that is the correction signal that, now the channel correcting device receives will be respectively s 1', s 2', s 3' and s 4'.
203, according to above-mentioned M receive path loopback receiving send out the correction signal of launching on passage in above-mentioned correction, calculate respectively the delay compensation coefficient of an above-mentioned M receive path;
In embodiments of the present invention, the correction signal of above-mentioned M the receive path loopback that the channel correcting device can receive according to step 202, an above-mentioned M receive path is carried out respectively to channel estimating, obtain the channel response value of an above-mentioned M receive path, afterwards according to the channel response value of an above-mentioned M receive path, calculate respectively the delay inequality of each receive path and benchmark receive path on frequency domain or time domain, and by above-mentioned each receive path of calculating and the delay inequality of benchmark receive path, respectively as the delay compensation coefficient of above-mentioned each receive path, wherein, the said reference receive path is in an above-mentioned M receive path, in step 203, the delay compensation coefficient of benchmark receive path is 1.Wherein, can determine from an above-mentioned M receive path according to certain principle in the embodiment of the present invention that a receive path is as the benchmark receive path, for example, can determine from an above-mentioned M receive path that according to the time delay minimum principle receive path is as the benchmark receive path, perhaps, also can determine from an above-mentioned M receive path at random that a receive path, as the benchmark receive path, is not construed as limiting herein.
When the channel correcting device calculates the delay inequality of each receive path and benchmark receive path according to the channel response value of an above-mentioned M receive path on frequency domain, the channel correcting device is at first according to the channel response value of an above-mentioned M receive path, calculate respectively the phase difference of each receive path and benchmark receive path on frequency domain, afterwards according to the conversion formula of phase place and time delay, according to the phase difference of each receive path calculated and benchmark receive path, calculate the delay inequality of each receive path and benchmark receive path.Illustrate, suppose in step 201, the channel correcting device is being proofreaied and correct emission correction signal s on a passage, and the channel correcting device receives correction signal s in step 202 1', s 2', s 3' and s 4', wherein, s 1' the eat dishes without rice or wine signal of loopback of the antenna of sending out 1 of passage and receive path through overcorrect for s, s 2' the eat dishes without rice or wine signal of loopback of the antenna of sending out 2 of passage and receive paths through overcorrect for s, s 3' the eat dishes without rice or wine signal of loopback of the antenna of sending out 3 of passage and receive paths through overcorrect for s, s 4' the eat dishes without rice or wine signal of loopback of the antenna of sending out 4 of passage and receive paths through overcorrect for s.The correction signal that at first the channel correcting device receives according to step 202, carry out respectively channel estimating to receive path 1～4, for example, the correction signal received carried out to conjugate multiplication (that is, by s previously in proofreading and correct the correction signal of sending out the passage emission 1' carry out conjugate multiplication with s, s2 ' and s are carried out to conjugate multiplication, s 3' carry out conjugate multiplication, s with s 4' with s, carry out conjugate multiplication), obtain the least square (LS of the channel response of each receive path, Least Square) estimate, and then by processing such as noise reductions, obtain the channel response value of receive path 1～4, suppose by g (1, k) mean the channel response value of k subcarrier of receive path 1, g (2, k) mean the channel response value of k subcarrier of receive path 2, g (3, k) mean the channel response value of k subcarrier of receive path 3, g (4, k) mean the channel response value of k subcarrier of receive path 4, using receive path 1 as the benchmark receive path, by g (2, k) and g (1, k) doing conjugate multiplication processes, obtain the phase difference △ θ that on receive path 2 and receive path 1, subcarrier is k 2(k), then on all subcarriers, calculate the △ θ of an equivalence 2, by that analogy, by g (3, k) and g (1, k) do conjugate multiplication and process, obtain the phase difference △ θ that on receive path 3 and receive path 1, subcarrier is k 3(k), then on all subcarriers, calculate the △ θ of an equivalence 3, by g (4, k) and g (1, k) do conjugate multiplication and process, obtain the phase difference △ θ that on receive path 4 and receive path 1, subcarrier is k 4(k), then on all subcarriers, calculate the △ θ of an equivalence 4.Finally according to △ θ 2, △ θ 3And △ θ (k) 4, and the conversion formula of phase place and time delay
Figure BDA0000367924630000141
Can obtain the delay inequality △ τ of receive path 2 and receive path 1 2, the delay inequality △ τ of receive path 3 and receive path 1 3, the delay inequality △ τ of receive path 4 and receive path 1 4, wherein, at formula
Figure BDA0000367924630000142
In, f means the frequency domain width of subcarrier, afterwards by △ τ 2, △ τ 3With △ τ 4Respectively as receive path 2, the delay compensation coefficient of receive path 3 and receive path 4, the delay compensation coefficient of receive path 1 is 1.
When the channel correcting device calculates the delay inequality of each receive path and benchmark receive path according to the channel response value of an above-mentioned M receive path on time domain, the channel correcting device arrives time domain by Fourier transform by the channel response value transform of an above-mentioned M receive path, then on time domain, calculates the delay inequality of each receive path and benchmark receive path.Illustrate, suppose in step 201, the channel correcting device is being proofreaied and correct emission correction signal s on a passage, and the channel correcting device receives correction signal s in step 202 1', s 2', s 3' and s 4', wherein, s 1' the eat dishes without rice or wine signal of loopback of the antenna of sending out 1 of passage and receive path through overcorrect for s, s 2' the eat dishes without rice or wine signal of loopback of the antenna of sending out 2 of passage and receive paths through overcorrect for s, s 3' the eat dishes without rice or wine signal of loopback of the antenna of sending out 3 of passage and receive paths through overcorrect for s, s 4' the eat dishes without rice or wine signal of loopback of the antenna of sending out 4 of passage and receive paths through overcorrect for s.The correction signal that at first the channel correcting device receives according to step 202, carry out respectively channel estimating to receive path 1～4, for example, the correction signal received carried out to conjugate multiplication (that is, by s previously in proofreading and correct the correction signal of sending out the passage emission 1' carry out conjugate multiplication with s, by s 2' carry out conjugate multiplication, s with s 3' carry out conjugate multiplication, s with s 4' with s, carry out conjugate multiplication), obtain the least square (LS of the channel response of each receive path, Least Square) estimate, and then by processing such as noise reductions, obtain the channel response value of receive path 1～4, suppose by g (1, k) mean the channel response value of k subcarrier of receive path 1, g (2, k) mean the channel response value of k subcarrier of receive path 2, g (3, k) mean the channel response value of k subcarrier of receive path 3, g (4, k) mean the channel response value of k subcarrier of receive path 4, using receive path 1 as the benchmark receive path, the channel correcting device by Fourier transform respectively by g (1, k), g (2, k), g (3, k) and g (4, k) transform to time domain, be designated as respectively g (1, n), g (2, n), g (3, n) and g (4, n), wherein, n means the time domain sampling point, afterwards at g (1, n) upper search maximum norm value, using this maximum norm value, corresponding time domain is supported the time delay τ of point as receive path 1 1, g (2, n) upper search maximum norm value, using this maximum norm value, corresponding time domain sampling point is as the time delay τ of receive path 2 2, g (3, n) upper search maximum norm value, using this maximum norm value, corresponding time domain sampling point is as the time delay τ of receive path 3 3, g (4, n) upper search maximum norm value, using this maximum norm value, corresponding time domain sampling point is as the time delay τ of receive path 4 4, by τ 2with τ 1subtract each other, obtain the delay inequality △ τ of receive path 2 and receive path 1 2, by τ 3with τ 1subtract each other, obtain the delay inequality △ τ of receive path 3 and receive path 1 3, by △ τ 3with τ 1subtract each other, obtain the delay inequality △ τ of receive path 4 and receive path 1 4, afterwards by △ τ 2, △ τ 3with △ τ 4respectively as receive path 2, the delay compensation coefficient of receive path 3 and receive path 4, the delay compensation coefficient of receive path 1 is 1.
204, according to the delay compensation coefficient of an above-mentioned M receive path, respectively an above-mentioned M receive path is carried out to channel correcting, so that the time delay between an above-mentioned M receive path is consistent;
For example, the delay compensation coefficient of supposing j the receive path of i RRU calculating in step 203 is α i,j, j the receive path of i RRU being carried out to channel correcting can be designated as:
Figure BDA0000367924630000161
, wherein, h i,jThe frequency domain response that means j the receive path of front i the RRU of channel correcting,
Figure BDA0000367924630000162
The frequency domain response of j the receive path of i RRU after the expression channel correcting.
It should be noted that, channel correcting method in the embodiment of the present invention can be applied to FDD system, CoMP system or other adopts in the communication system of a plurality of RRU, channel correcting device in the embodiment of the present invention can be BBU, can be also the device that is independent of BBU, is not construed as limiting herein.
Therefore, send out passage by arranging to proofread and correct in the embodiment of the present invention, and make the working frequency points of a correction passage identical with the working frequency points of the receive path of RRU, thereby make the receive path of RRU proofreading and correct the correction signal of sending out the passage emission by loopback, calculate the delay compensation coefficient of the receive path of different RRUs according to the correction signal of loopback, realize the channel correcting of the receive path between different RRUs, thereby realized the receive path time delay consistency of a plurality of remote radio unit (RRU)s.
Be illustrated in figure 3 a kind of RRU Two bors d's oeuveres communication system of the channel correcting method of the application embodiment of the present invention, BBU is connected with RRU1 with RRU0 respectively, and RRU0 comprises two transmission channels and (is designated as respectively
Figure BDA0000367924630000163
With
Figure BDA0000367924630000164
) and two receive paths (be designated as respectively With
Figure BDA0000367924630000166
), RRU1 comprises two transmission channels and (is designated as respectively
Figure BDA0000367924630000167
With
Figure BDA0000367924630000168
) and two receive paths (be designated as respectively With
Figure BDA00003679246300001610
), proofread and correct a passage for one and (be designated as
Figure BDA00003679246300001611
) and one proofread and correct to receive passage and (be designated as
Figure BDA00003679246300001612
),
Figure BDA00003679246300001613
With
Figure BDA00003679246300001614
With antenna 1, be connected,
Figure BDA00003679246300001615
With
Figure BDA00003679246300001616
With antenna 2, be connected,
Figure BDA00003679246300001617
With With antenna 3, be connected,
Figure BDA00003679246300001619
With With antenna 4, be connected,
Figure BDA00003679246300001621
With
Figure BDA00003679246300001622
With antenna 5, be connected.
A kind of channel correcting the device below embodiment of the present invention provided is described, this channel correcting application of installation is in the communication system that comprises N RRU, wherein, in an above-mentioned N RRU, have at least a RRU to comprise and proofread and correct the receipts passage, as shown in Figure 4, the channel correcting device 400 in the embodiment of the present invention comprises:
Transmitter unit 401, for launching correction signal respectively on M the transmission channel of an above-mentioned N RRU, wherein, the working frequency points of an above-mentioned M transmission channel is identical with the working frequency points that passage is received in above-mentioned correction, above-mentioned N > 1, above-mentioned M > 1;
In embodiments of the present invention, transmitter unit 401 can adopt frequency division mode, code minute mode or alternate manner to launch correction signal respectively on M the transmission channel of an above-mentioned N RRU, the correction signal that transmitter unit 401 is launched on an above-mentioned M transmission channel can be identical, also can be different, above-mentioned correction signal can be for example public reference signal (CRS, Common Reference Signal), can be also the redesign other there is the correction signal of good characteristic, be not construed as limiting herein.
Receiving element 402, for receiving the correction signal of launching on an above-mentioned M transmission channel of above-mentioned correction receipts passage loopback.
Computing unit 403, receive the correction signal of launching on an above-mentioned M transmission channel of passage loopback for the above-mentioned correction received according to receiving element 402, calculate respectively the delay compensation coefficient of an above-mentioned M transmission channel.
Channel correcting unit 404, the delay compensation coefficient for above-mentioned M transmission channel calculating according to computing unit 403, carry out channel correcting to an above-mentioned M transmission channel respectively, so that the time delay between an above-mentioned M transmission channel is consistent.
In a kind of application scenarios, computing unit 403 specifically comprises: the first sub-computing unit and the second sub-computing unit.Wherein, the first sub-computing unit is used for: the correction signal of launching on an above-mentioned M transmission channel of passage loopback is received in the above-mentioned correction received according to receiving element 402, an above-mentioned M transmission channel is carried out to channel estimating, obtain the channel response value of an above-mentioned M transmission channel; The second sub-computing unit is used for: the channel response value of above-mentioned M the transmission channel calculated according to the above-mentioned first sub-computing unit, calculate respectively the delay inequality of each transmission channel and said reference transmission channel, wherein, the said reference transmission channel is in an above-mentioned M transmission channel; Above-mentioned each transmission channel that computing unit 403 calculates the above-mentioned second sub-computing unit and the delay inequality of said reference transmission channel, respectively as the delay compensation coefficient of above-mentioned each transmission channel.In one implementation, the above-mentioned second sub-computing unit specifically for: according to the channel response value of an above-mentioned M transmission channel, calculate respectively the phase difference of each transmission channel and said reference transmission channel on frequency domain; According to the phase difference of above-mentioned each transmission channel and said reference transmission channel, calculate the delay inequality of above-mentioned each transmission channel and said reference transmission channel.Certainly, in another kind of implementation, the above-mentioned second sub-computing unit also can calculate respectively the delay inequality of each transmission channel and said reference transmission channel according to the channel response value of an above-mentioned M transmission channel on time domain, is not construed as limiting herein.
It should be noted that, in the embodiment of the present invention, channel correcting device 400 can be as the channel correcting device in above-mentioned embodiment of the method, can be for realizing whole technical schemes of said method embodiment, its specific implementation process can, with reference to the associated description in said method embodiment, repeat no more herein.Channel correcting device in the embodiment of the present invention can be applied to FDD system, CoMP system or other adopts in the communication system of a plurality of RRU, channel correcting device in the embodiment of the present invention can be baseband processing unit (BBU, Base band Unit), can be also the device that is independent of BBU, be not construed as limiting herein.
Therefore, receive passage by arranging to proofread and correct in the embodiment of the present invention, and make the working frequency points of correction receipts passage identical with the working frequency points of the transmission channel of RRU, thereby make proofread and correct to receive passage can loopback in the correction signal of the transmission channel emission of different RRUs, calculate the delay compensation coefficient of the transmission channel of different RRUs according to the correction signal of loopback, realize the channel correcting of the transmission channel between different RRUs, thereby realized the transmission channel time delay consistency of a plurality of RRU.
The embodiment of the present invention also provides a kind of computer-readable storage medium, and wherein, this computer-readable storage medium has program stored therein, and this program is carried out the part or all of layout that comprises the channel correcting method of putting down in writing in said method embodiment.
The embodiment of the present invention provides another channel correcting device, and this channel correcting application of installation is in the communication system that comprises N RRU, wherein, in an above-mentioned N RRU, have at least a RRU to comprise and proofread and correct the receipts passage, as shown in Figure 5, channel correcting device 500 in the embodiment of the present invention comprises:
The quantity of the processor 504 of input unit 501, output device 502, memory 503 and processor 504(channel correcting device can be one or more, and it is example that Fig. 5 be take a processor).In some embodiments of the invention, input unit 501, output device 502, memory 503 and processor 504 can connect by bus or alternate manner, as shown in Figure 5 by bus, to be connected to example.
Wherein, processor 504 is carried out following steps:
Launch correction signal respectively on M the transmission channel of an above-mentioned N RRU, wherein, the working frequency points of an above-mentioned M transmission channel is identical with the working frequency points that passage is received in above-mentioned correction, N > 1, M > 1;
Receive above-mentioned correction and receive the correction signal of launching of passage loopback on an above-mentioned M transmission channel;
Receive the correction signal of launching of passage loopback according to the above-mentioned correction received on an above-mentioned M transmission channel, calculate respectively the delay compensation coefficient of an above-mentioned M transmission channel;
According to the delay compensation coefficient of an above-mentioned M transmission channel, respectively an above-mentioned M transmission channel is carried out to channel correcting, so that the time delay between an above-mentioned M transmission channel is consistent.
It should be noted that, in the embodiment of the present invention, channel correcting device 500 can be as the channel correcting device in above-mentioned embodiment of the method, can be for realizing whole technical schemes of said method embodiment, its specific implementation process can, with reference to the associated description in said method embodiment, repeat no more herein.Channel correcting device in the embodiment of the present invention can be applied to FDD system, CoMP system or other adopts in the communication system of a plurality of RRU, channel correcting device in the embodiment of the present invention can be BBU, can be also the device that is independent of BBU, be not construed as limiting herein.
Therefore, receive passage by arranging to proofread and correct in the embodiment of the present invention, and make the working frequency points of correction receipts passage identical with the working frequency points of the transmission channel of RRU, thereby make proofread and correct to receive passage can loopback in the correction signal of the transmission channel emission of different RRUs, calculate the delay compensation coefficient of the transmission channel of different RRUs according to the correction signal of loopback, realize the channel correcting of the transmission channel between different RRUs, thereby realized the transmission channel time delay consistency of a plurality of RRU.
Below another the channel correcting device in the embodiment of the present invention is described, this channel correcting application of installation is in the communication system that comprises N RRU, wherein, in an above-mentioned N RRU, have at least a RRU to comprise and proofread and correct a passage, the structural representation of this channel correcting device can, with reference to shown in Fig. 4, comprise:
Transmitter unit, for sending out passage emission correction signal in above-mentioned correction;
In embodiments of the present invention, above-mentioned correction signal for example can be simulated UE and produce its parameter of Sounding RS(and can be configured from base band) or the DMRS signal as correction signal, also can design the correction signal that other have good characteristic, be not construed as limiting herein.
Receiving element, for M receive path loopback receiving an above-mentioned N RRU send out the correction signal of launching on passage in above-mentioned correction, wherein, the working frequency points that the working frequency points of an above-mentioned M receive path is sent out passage with above-mentioned correction is identical, N > 1, M > 1.
Computing unit, for above-mentioned M receive path loopback receiving according to above-mentioned receiving element send out the correction signal of launching on passage in above-mentioned correction, calculate respectively the delay compensation coefficient of an above-mentioned M receive path.
The channel correcting unit, the delay compensation coefficient for above-mentioned M receive path calculating according to above-mentioned computing unit, carry out channel correcting to an above-mentioned M receive path respectively, so that the time delay between an above-mentioned M receive path is consistent.
In a kind of application scenarios, above-mentioned computing unit specifically comprises: the first sub-computing unit and the second sub-computing unit.Wherein, the first sub-computing unit is used for: above-mentioned M the receive path loopback received according to above-mentioned receiving element send out the correction signal of launching on passage in above-mentioned correction, an above-mentioned M receive path is carried out to channel estimating, obtain the channel response value of an above-mentioned M receive path; The second sub-computing unit is used for: the channel response value of above-mentioned M the receive path calculated according to the above-mentioned first sub-computing unit, calculate respectively the delay inequality of each receive path and benchmark receive path, wherein, the said reference receive path is in an above-mentioned M receive path; Above-mentioned each receive path that above-mentioned computing unit calculates the above-mentioned second sub-computing unit and the delay inequality of said reference receive path, respectively as the delay compensation coefficient of above-mentioned each transmission channel.In one implementation, the above-mentioned second sub-computing unit specifically for: according to the channel response value of an above-mentioned M receive path, calculate respectively the phase difference of each receive path and said reference receive path on frequency domain; According to the phase difference of above-mentioned each receive path and said reference receive path, calculate the delay inequality of above-mentioned each receive path and said reference receive path.Certainly, in another kind of implementation, the above-mentioned second sub-computing unit also can calculate respectively the delay inequality of each transmission channel and said reference transmission channel according to the channel response value of an above-mentioned M receive path on time domain, is not construed as limiting herein.
It should be noted that, in the embodiment of the present invention, the channel correcting device can be as the channel correcting device in above-mentioned embodiment of the method, can be for realizing whole technical schemes of said method embodiment, its specific implementation process can, with reference to the associated description in said method embodiment, repeat no more herein.Channel correcting device in the embodiment of the present invention can be applied to FDD system, CoMP system or other adopts in the communication system of a plurality of RRU, channel correcting device in the embodiment of the present invention can be BBU, can be also the device that is independent of BBU, be not construed as limiting herein.
Therefore, send out passage by arranging to proofread and correct in the embodiment of the present invention, and make the working frequency points of a correction passage identical with the working frequency points of the receive path of RRU, thereby make the receive path of different RRUs proofreading and correct the correction signal of sending out the passage emission by loopback, calculate the delay compensation coefficient at the receive path of different RRUs according to the correction signal of loopback, realize the channel correcting of the receive path between different RRUs, thereby realized the receive path time delay consistency of a plurality of RRU.
The embodiment of the present invention provides another the channel correcting device, and this channel correcting application of installation is in the communication system that comprises N RRU, wherein, in an above-mentioned N RRU, have at least a RRU to comprise and proofread and correct a passage, the structural representation of this channel correcting device can, with reference to shown in Fig. 5, comprise:
Input unit, output device, memory and processor.In some embodiments of the invention, input unit, output device, memory and processor can connect by bus or alternate manner.
Wherein, the processor in the embodiment of the present invention is carried out following steps:
Send out passage emission correction signal in above-mentioned correction;
Receive an above-mentioned N RRU M receive path loopback send out the correction signal of launching on passage in above-mentioned correction, wherein, the working frequency points that the working frequency points of an above-mentioned M receive path is sent out passage with above-mentioned correction is identical, above-mentioned N > 1, above-mentioned M > 1;
According to above-mentioned M the receive path loopback received send out the correction signal of launching on passage in above-mentioned correction, calculate respectively the delay compensation coefficient of an above-mentioned M receive path;
According to the delay compensation coefficient of an above-mentioned M receive path, respectively an above-mentioned M receive path is carried out to channel correcting, so that the time delay between an above-mentioned M receive path is consistent.
It should be noted that, in the embodiment of the present invention, the channel correcting device can be as the channel correcting device in above-mentioned embodiment of the method, can be for realizing whole technical schemes of said method embodiment, its specific implementation process can, with reference to the associated description in said method embodiment, repeat no more herein.Channel correcting device in the embodiment of the present invention can be applied to FDD system, CoMP system or other adopts in the communication system of a plurality of RRU, channel correcting device in the embodiment of the present invention can be BBU, can be also the device that is independent of BBU, be not construed as limiting herein.
Therefore, send out passage by arranging to proofread and correct in the embodiment of the present invention, and make the working frequency points of a correction passage identical with the working frequency points of the receive path of RRU, thereby make the receive path of different RRUs proofreading and correct the correction signal of sending out the passage emission by loopback, calculate the delay compensation coefficient at the receive path of different RRUs according to the correction signal of loopback, realize the channel correcting of the receive path between different RRUs, thereby realized the receive path time delay consistency of a plurality of RRU.
The embodiment of the present invention also provides a kind of channel correcting system, and as shown in Figure 6, the channel correcting system 600 in the embodiment of the present invention comprises:
N RRU(is as the RRU6011～RRU601N in Fig. 6), the first passage means for correcting 602 be connected with an above-mentioned N RRU, and the second channel means for correcting 603 be connected with an above-mentioned N RRU; Wherein, in an above-mentioned N RRU, have at least a RRU to comprise and proofread and correct the receipts passage, and have at least a RRU to comprise a correction passage.
First passage means for correcting 602, for: launch correction signal respectively on M the transmission channel of an above-mentioned N RRU, wherein, the working frequency points of an above-mentioned M transmission channel is identical with the working frequency points that passage is received in above-mentioned correction, above-mentioned N > 1, above-mentioned M > 1; Receive above-mentioned correction and receive the correction signal of launching of passage loopback on an above-mentioned M transmission channel; Receive the correction signal of launching of passage loopback according to the above-mentioned correction received on an above-mentioned M transmission channel, calculate respectively the delay compensation coefficient of an above-mentioned M transmission channel; According to the delay compensation coefficient of an above-mentioned M transmission channel, respectively an above-mentioned M transmission channel is carried out to channel correcting, so that the time delay between an above-mentioned M transmission channel is consistent;
Second channel means for correcting 603, for: passage emission correction signal sent out in above-mentioned correction; Receive an above-mentioned N RRU M receive path loopback send out the correction signal of launching on passage in above-mentioned correction, wherein, the working frequency points that the working frequency points of an above-mentioned M receive path is sent out passage with above-mentioned correction is identical; According to above-mentioned M the receive path loopback received send out the correction signal of launching on passage in above-mentioned correction, calculate respectively the delay compensation coefficient of an above-mentioned M receive path; According to the delay compensation coefficient of an above-mentioned M receive path, respectively an above-mentioned M receive path is carried out to channel correcting, so that the time delay between an above-mentioned M receive path is consistent.
It should be noted that, in the embodiment of the present invention, first passage means for correcting 602 and second channel means for correcting 603 can be as the channel correcting devices in above-mentioned embodiment of the method, can be for realizing whole technical schemes of said method embodiment, its specific implementation process can, with reference to the associated description in said method embodiment, repeat no more herein.
Therefore, receive passage and proofread and correct and send out passage by arranging to proofread and correct in the embodiment of the present invention, and make the working frequency points of correction receipts passage identical with the working frequency points of the transmission channel of RRU, make to proofread and correct the working frequency points of sending out passage identical with the working frequency points of the receive path of RRU, thereby make proofread and correct to receive passage can loopback in the correction signal of the transmission channel emission of different RRUs, calculate the delay compensation coefficient of the transmission channel of different RRUs according to the correction signal of loopback, make the receive path of different RRUs proofreading and correct the correction signal of sending out the passage emission by loopback, calculate the delay compensation coefficient at the receive path of different RRUs according to the correction signal of loopback, realize transmission channel between different RRUs and the channel correcting of receive path, thereby transmission channel and the receive path time delay consistency of a plurality of remote radio unit (RRU)s have been realized.
It should be noted that, for aforesaid each embodiment of the method, for easy description, therefore it all is expressed as to a series of combination of actions, but those skilled in the art should know, the present invention is not subject to the restriction of described sequence of movement, because according to the present invention, some step can adopt other order or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and related action and module might not be all that the present invention is necessary.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, there is no the part described in detail in certain embodiment, can be referring to the associated description of other embodiment.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks in above-described embodiment is to come the hardware that instruction is relevant to complete by program, this program can be stored in a computer-readable recording medium, and storage medium is such as comprising: read-only memory, random asccess memory, disk or CD etc.
Above channel correcting method, relevant apparatus and system between a kind of remote radio unit (RRU) provided by the present invention are described in detail, applied specific case herein principle of the present invention and way of example are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, the thought according to the embodiment of the present invention, all will change in specific embodiments and applications, and to sum up, this description should not be construed as limitation of the present invention.

Claims (15)

1. the channel correcting method between a remote radio unit (RRU), in the communication system that is applied to comprise N remote radio unit (RRU), is characterized in that, in a described N remote radio unit (RRU), have at least a remote radio unit (RRU) to comprise and proofread and correct the receipts passage, described channel correcting method comprises:
Launch correction signal respectively on M transmission channel of a described N remote radio unit (RRU), wherein, the working frequency points of a described M transmission channel is identical with the working frequency points that passage is received in described correction, described N > 1, described M > 1;
Receive described correction and receive the correction signal of launching of passage loopback on a described M transmission channel;
Receive the correction signal of launching of passage loopback according to the described correction received on a described M transmission channel, calculate respectively the delay compensation coefficient of a described M transmission channel;
According to the delay compensation coefficient of a described M transmission channel, respectively a described M transmission channel is carried out to channel correcting, so that the time delay between a described M transmission channel is consistent.
2. method according to claim 1, is characterized in that,
The correction signal of launching on a described M transmission channel of passage loopback is received in the described correction that described basis receives, and calculates respectively the delay compensation coefficient of a described M transmission channel, comprising:
Receive the correction signal of launching of passage loopback according to the described correction received on a described M transmission channel, a described M transmission channel is carried out to channel estimating, obtain the channel response value of a described M transmission channel;
According to the channel response value of a described M transmission channel, calculate respectively the delay inequality of each transmission channel and benchmark transmission channel, wherein, described benchmark transmission channel is in a described M transmission channel;
By described each transmission channel of calculating and the delay inequality of described benchmark transmission channel, respectively as the delay compensation coefficient of described each transmission channel.
3. method according to claim 2, is characterized in that,
The described channel response value according to a described M transmission channel, calculate respectively the delay inequality of each transmission channel and described benchmark transmission channel, comprising:
According to the channel response value of a described M transmission channel, calculate respectively the phase difference of each transmission channel and described benchmark transmission channel on frequency domain;
According to the phase difference of described each transmission channel and described benchmark transmission channel, calculate the delay inequality of described each transmission channel and described benchmark transmission channel.
4. according to the described method of claims 1 to 3 any one, it is characterized in that,
Describedly launch correction signal respectively on M transmission channel of a described N remote radio unit (RRU), be specially:
Adopt the frequency division mode to launch correction signal respectively on M transmission channel of a described N remote radio unit (RRU);
Perhaps,
Adopt code minute mode to launch correction signal respectively on M transmission channel of a described N remote radio unit (RRU).
5. the channel correcting method between a remote radio unit (RRU), in the communication system that is applied to comprise N remote radio unit (RRU), is characterized in that, in a described N remote radio unit (RRU), have at least a remote radio unit (RRU) to comprise and proofread and correct a passage, described channel correcting method comprises:
Send out passage emission correction signal in described correction;
Receive a described N remote radio unit (RRU) M receive path loopback send out the correction signal of launching on passage in described correction, wherein, the working frequency points that the working frequency points of a described M receive path is sent out passage with described correction is identical, described N > 1, described M > 1;
According to described M the receive path loopback received send out the correction signal of launching on passage in described correction, calculate respectively the delay compensation coefficient of a described M receive path;
According to the delay compensation coefficient of a described M receive path, respectively a described M receive path is carried out to channel correcting, so that the time delay between a described M receive path is consistent.
6. method according to claim 5, is characterized in that,
Described M the receive path loopback that described basis receives send out the correction signal of launching on passage in described correction, calculate respectively the delay compensation coefficient of a described M receive path, comprising:
According to described M the receive path loopback received send out the correction signal of launching on passage in described correction, a described M receive path is carried out to channel estimating, obtain the channel response value of a described M receive path;
According to the channel response value of a described M receive path, calculate respectively the delay inequality of each receive path and benchmark receive path, wherein, described benchmark receive path is in a described M receive path;
By described each receive path of calculating and the delay inequality of described benchmark receive path, respectively as the delay compensation coefficient of described each receive path.
7. method according to claim 6, is characterized in that,
The described channel response value according to a described M receive path, calculate respectively the delay inequality of each receive path and described benchmark receive path, comprising:
According to the channel response value of a described M receive path, calculate respectively the phase difference of each receive path and described benchmark receive path on frequency domain;
According to the phase difference of described each receive path and described benchmark receive path, calculate the delay inequality of described each receive path and described benchmark receive path.
8. a channel correcting device, in the communication system that is applied to comprise N remote radio unit (RRU), is characterized in that, in a described N remote radio unit (RRU), has at least a remote radio unit (RRU) to comprise and proofread and correct the receipts passage, and described channel correcting device comprises:
Transmitter unit, for launching correction signal respectively on M transmission channel of a described N remote radio unit (RRU), wherein, the working frequency points of a described M transmission channel is identical with the working frequency points that passage is received in described correction, described N > 1, described M > 1;
Receiving element, for receiving the correction signal of launching on a described M transmission channel of described correction receipts passage loopback;
Computing unit, receive the correction signal of launching on a described M transmission channel of passage loopback for the described correction received according to described receiving element, calculate respectively the delay compensation coefficient of a described M transmission channel;
The channel correcting unit, for the delay compensation coefficient according to a described M transmission channel, carry out channel correcting to a described M transmission channel respectively, so that the time delay between a described M transmission channel is consistent.
9. channel correcting device according to claim 8, is characterized in that,
Described computing unit comprises:
The first sub-computing unit, receive the correction signal of launching of passage loopback on a described M transmission channel for the described correction received according to described receiving element, a described M transmission channel is carried out to channel estimating, obtain the channel response value of a described M transmission channel;
The second sub-computing unit, channel response value for described M transmission channel calculating according to the described first sub-computing unit, calculate respectively the delay inequality of each transmission channel and benchmark transmission channel, wherein, described benchmark transmission channel is in a described M transmission channel;
Described each transmission channel that described computing unit calculates the described second sub-computing unit and the delay inequality of described benchmark transmission channel, respectively as the delay compensation coefficient of described each transmission channel.
10. channel correcting device according to claim 9, is characterized in that,
The described second sub-computing unit specifically for: according to the channel response value of a described M transmission channel, calculate respectively the phase difference of each transmission channel and described benchmark transmission channel on frequency domain; According to the phase difference of described each transmission channel and described benchmark transmission channel, calculate the delay inequality of described each transmission channel and described benchmark transmission channel.
11. the described channel correcting device of according to Claim 8 to 10 any one, is characterized in that,
Described transmitter unit specifically for: adopt frequency division mode or a code minute mode to launch correction signal respectively on M transmission channel of a described N remote radio unit (RRU).
12. a channel correcting device, in the communication system that is applied to comprise N remote radio unit (RRU), is characterized in that, in a described N remote radio unit (RRU), has at least a remote radio unit (RRU) to comprise and proofread and correct a passage, described channel correcting device comprises:
Transmitter unit, for sending out passage emission correction signal in described correction;
Receiving element, for receive a described N remote radio unit (RRU) M receive path loopback send out the correction signal of launching on passage in described correction, wherein, the working frequency points that the working frequency points of a described M receive path is sent out passage with described correction is identical, described N > 1, described M > 1;
Computing unit, for described M receive path loopback receiving according to described receiving element send out the correction signal of launching on passage in described correction, calculate respectively the delay compensation coefficient of a described M receive path;
The channel correcting unit, the delay compensation coefficient for described M receive path calculating according to computing unit, carry out channel correcting to a described M receive path respectively, so that the time delay between a described M receive path is consistent.
13. channel correcting device according to claim 12, is characterized in that,
Described computing unit comprises:
The first sub-computing unit, send out the correction signal of launching on passage for described M receive path loopback receiving according to described receiving element in described correction, a described M receive path is carried out to channel estimating, obtain the channel response value of a described M receive path;
The second sub-computing unit, channel response value for described M receive path calculating according to the described first sub-computing unit, calculate respectively the delay inequality of each receive path and benchmark receive path, wherein, described benchmark receive path is in a described M receive path;
Described each receive path that described computing unit calculates the described second sub-computing unit and the delay inequality of described benchmark receive path, respectively as the delay compensation coefficient of described each transmission channel.
14. channel correcting device according to claim 13, is characterized in that,
The described second sub-computing unit specifically for: according to the channel response value of a described M receive path, calculate respectively the phase difference of each receive path and described benchmark receive path on frequency domain; According to the phase difference of described each receive path and described benchmark receive path, calculate the delay inequality of described each receive path and described benchmark receive path.
15. a channel correcting system, is characterized in that, comprising:
N remote radio unit (RRU), the first passage means for correcting be connected with a described N remote radio unit (RRU), and the second channel means for correcting be connected with a described N remote radio unit (RRU);
Wherein, in a described N remote radio unit (RRU), have at least a remote radio unit (RRU) to comprise and proofread and correct the receipts passage, and have at least a remote radio unit (RRU) to comprise a correction passage;
Described first passage means for correcting, be used for: launch correction signal respectively on M transmission channel of a described N remote radio unit (RRU), wherein, the working frequency points of a described M transmission channel is identical with the working frequency points that passage is received in described correction, described N > 1, described M > 1; Receive described correction and receive the correction signal of launching of passage loopback on a described M transmission channel; Receive the correction signal of launching of passage loopback according to the described correction received on a described M transmission channel, calculate respectively the delay compensation coefficient of a described M transmission channel; According to the delay compensation coefficient of a described M transmission channel, respectively a described M transmission channel is carried out to channel correcting, so that the time delay between a described M transmission channel is consistent;
Described second channel means for correcting, for: passage emission correction signal sent out in described correction; Receive a described N remote radio unit (RRU) M receive path loopback send out the correction signal of launching on passage in described correction, wherein, the working frequency points that the working frequency points of a described M receive path is sent out passage with described correction is identical; According to described M the receive path loopback received send out the correction signal of launching on passage in described correction, calculate respectively the delay compensation coefficient of a described M receive path; According to the delay compensation coefficient of a described M receive path, respectively a described M receive path is carried out to channel correcting, so that the time delay between a described M receive path is consistent.
CN2013103608086A 2013-08-16 2013-08-16 Method, related device and system for correcting channels among far-end radio frequency units Pending CN103428125A (en)

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