CN106411372A  Wireless communication method, macro base station and pico base station  Google Patents
Wireless communication method, macro base station and pico base station Download PDFInfo
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 CN106411372A CN106411372A CN201510466747.0A CN201510466747A CN106411372A CN 106411372 A CN106411372 A CN 106411372A CN 201510466747 A CN201510466747 A CN 201510466747A CN 106411372 A CN106411372 A CN 106411372A
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 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04B—TRANSMISSION
 H04B7/00—Radio transmission systems, i.e. using radiation field
 H04B7/02—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas
 H04B7/04—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
 H04B7/0413—MIMO systems
 H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04B—TRANSMISSION
 H04B7/00—Radio transmission systems, i.e. using radiation field
 H04B7/02—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas
 H04B7/04—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
 H04B7/06—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
 H04B7/0613—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04B—TRANSMISSION
 H04B7/00—Radio transmission systems, i.e. using radiation field
 H04B7/02—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas
 H04B7/04—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
 H04B7/06—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
 H04B7/0613—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
 H04B7/0615—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
 H04B7/0619—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
 H04B7/0636—Feedback format
 H04B7/0639—Using selective indices, e.g. of a codebook, e.g. predistortion matrix index [PMI] or for beam selection

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04W—WIRELESS COMMUNICATION NETWORKS
 H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
 H04W16/24—Cell structures
 H04W16/32—Hierarchical cell structures
Abstract
Description
Technical field
The present embodiments relate to communication technology, more particularly, to a kind of wireless communications method, macro base station and micro Base station.
Background technology
The user rate demand that mobile broadband network grows with each passing day is so that macro and micro networks become a kind of trend, grand Microgroup net passes through macro base station (Macro Base Station) and microbase station (Pico Base Station) is common With the mode covering networking, microbase station is also referred to as little base station, and microbase station effect is by blind spot, focus holds Amount and coverage enhancement.Can be connected using wireline back haul between macro base station and microbase station and/or wireless backhaul connects Tap into row communication.
In wireless backhaul communications uplink, generally adopt multipleinput and multipleoutput (MultipleInput MultipleOutput, abbreviation MIMO) the skill upgrading availability of frequency spectrum.In correlation technique, by macro base station Channel estimation is carried out according to the uplink pilot signal that microbase station sends, obtains uplink physical channel matrix, so Afterwards, predefined precoding code is traveled through with cost criterion such as maximum capacity according to uplink physical channel matrix Quantify codebook set, obtain precoding and quantify code book, and will be pre in down channel by way of signaling Encoder matrix instruction (Precoding Matrix Indicator, abbreviation PMI) is sent to microbase station, micro base Stand and quantify to choose corresponding precoding matrix code book from precoding according to PMI, entered according to precoding matrix The up precoding of row.
In correlation technique, based on the precoding mechanism of code book, because the quantization that precoding quantifies code book can be drawn Enter interference so that limited by up precoding accuracy, code book cannot mate the channel of optimum, thus leading to Row capacity declines.
Content of the invention
The embodiment of the present invention provides a kind of wireless communications method, macro base station and microbase station, and macro base station can be by Highprecision uplink precoding matrix is sent to microbase station so that uplink precoding matrix is capable of optimum Join up channel, thus improve the capacity of up channel.
First aspect present invention provides a kind of wireless communications method, including：
Macro base station receives the uplink pilot signal that N number of microbase station sends respectively, and N more than or equal to 2 is just Integer；
The uplink pilot signal that described macro base station sends according to kth microbase station receiving, determines described The uplink physical channel matrix of kth microbase station, the value of k is 1,2 ... ..., N；
Described macro base station, according to the uplink physical channel matrix of described N number of microbase station, determines described N number of micro The uplink precoding matrix of base station；
Described macro base station, according to the uplink physical channel matrix of described kth microbase station, determines described kth The down physical channel matrix of individual microbase station；
Described macro base station, according to the down physical channel matrix of described kth microbase station, obtains described kth The precancellation weights of the down channel of individual microbase station；
Described macro base station uses the precancellation weights of down channel of described kth microbase station and described kth The uplink precoding matrix of individual microbase station, carries out being sent to described kth after precoding to downbound pilot frequency signal Individual microbase station, makes precancellation weights and the institute of the down channel of described kth microbase station by precoding The down physical channel matrix stating kth microbase station balances out, and described kth microbase station receives down The uplink precoding matrix of described kth microbase station is only included in row pilot signal.
In conjunction with a first aspect, in the first possible implementation of first aspect, methods described is also wrapped Include：
Described macro base station receives the upward signal that described kth microbase station sends, and described upward signal is institute State kth microbase station and treat sending signal using the uplink precoding matrix of described kth microbase station and carry out Signal after precoding；
Described macro base station according to the uplink physical channel matrix of described kth microbase station and described kth micro The uplink precoding matrix of base station, generates the up equivalent channel matrix of described kth microbase station；
Described macro base station is according to the up equivalent channel matrix of described kth microbase station and described upward signal Obtain described signal to be sent.
In conjunction with the first possible implementation of first aspect or first aspect, the second of first aspect Plant in possible implementation, described macro base station is according to the down physical channel square of described kth microbase station Battle array, obtains the precancellation weights of the down channel of described kth microbase station, including：
Described macro base station uses below equation to calculate the precancellation power of the down channel of described kth microbase station Value G_{k}：
G_{k}=(H'_{k})^{H}[H'_{k}(H'_{k})^{H}]^{1}, wherein, H '_{k}Down physical channel square for described kth microbase station Battle array.
In conjunction with first aspect, first aspect the first is any one to the possible implementation of second Kind, in the third possible implementation of first aspect, described macro base station is micro according to described kth The uplink physical channel matrix of base station, determines the down physical channel matrix of described kth microbase station, bag Include：
Described macro base station is according to the uplink physical channel matrix of described kth microbase station, and described kth The up channel of individual microbase station and the heterogeneite of down channel, obtain the descending thing of described kth microbase station Reason channel matrix.
In conjunction with the first any one to the third possible implementation of first aspect, first In 4th kind of possible implementation of aspect, described macro base station is up according to described kth microbase station Physical channel matrix and the uplink precoding matrix of described kth microbase station, generate described kth micro base The up equivalent channel matrix stood, including：
Described macro base station generates the up equivalent channel matrix of described kth microbase station according to equation below：
Wherein, H_{k}For the uplink physical channel matrix of described kth microbase station, W_{k}For institute State the uplink precoding matrix of kth microbase station.
In conjunction with first aspect, first aspect the first is any one to the 4th kind of possible implementation Kind, in the 5th kind of possible implementation of first aspect, described macro base station is according to described N number of micro base The uplink physical channel matrix stood, determines the uplink precoding matrix of described N number of microbase station, including：
During ith iteration, described macro base station prelists in determination the up of described kth microbase station During code matrix, described macro base station is according to the ascending of other microbase stations in addition to described kth microbase station Reason channel matrix, and uplink precoding matrix in the ith 1 time iterative process for other microbase stations described, Determine the interference strength of interference and interference radiating way that described kth microbase station be subject to, wherein, k's is initial Being worth the initial value for 1, i is also 1, and the initial value of the uplink precoding matrix of each microbase station is unit square Battle array；
The interference strength of the interference that described macro base station is subject to according to described kth microbase station and interference radiating way are true The interference weights of the interference that fixed described kth microbase station is subject to；
The interference weights of the interference that described kth microbase station is subject to by described macro base station are applied to described kth On the up channel of individual microbase station, obtain the up equivalent channel matrix of described kth microbase station；
Described macro base station, according to the up equivalent channel matrix of described kth microbase station, determines described kth Uplink precoding matrix during ith iteration for the individual microbase station；
Described macro base station uplink precoding matrix during ith iteration according to described N number of microbase station, And the uplink physical channel matrix of described nth microbase station determines ith iteration result；
Described macro base station determines whether to terminate iterative process according to described ith iteration result；
If it is determined that end iterative process, then the uplink precoding matrix during ith iteration is made respectively Uplink precoding matrix for described N number of microbase station；
If it is determined that not terminating iterative process, then i plus one, carrying out next iteration.
In conjunction with the 5th kind of possible implementation of first aspect, in the 6th kind of possible reality of first aspect In existing mode, described macro base station is according to the ascending of other microbase stations in addition to described kth microbase station Reason channel matrix, and uplink precoding matrix in the ith 1 time iterative process for other microbase stations described, Determine the interference strength of interference and interference radiating way that described kth microbase station be subject to, including：
Described macro base station is according to the uplink physical channel matrix of other microbase stations described, other microbase stations described The statistics covariance matrix of the uplink precoding matrix in the ith 1 time iterative process and uplink interference, really The interference matrix that fixed other microbase stations described produce；
Described macro base station carries out Eigenvalues Decomposition to described interference matrix, obtains described kth microbase station and is subject to The interference strength of the interference arrived and interference radiating way.
Second aspect present invention provides a kind of wireless communications method, including：
Microbase station sends uplink pilot signal to macro base station；
Described microbase station receives the downbound pilot frequency signal that described macro base station sends, and described downbound pilot frequency signal is Described macro base station according to the precancellation weights of down channel and the uplink precoding matrix of described microbase station under Row pilot signal carries out the signal after precoding, is supported by the pre of down channel of microbase station described in precoding The down physical channel matrix of weights and the described microbase station of disappearing balances out, and only wraps in described downbound pilot frequency signal Include the uplink precoding matrix of described microbase station；
Described microbase station carries out channel according to the downbound pilot frequency signal receiving and described downbound pilot frequency signal and estimates Meter obtains described descending equivalent channel matrix, determines that described descending equivalent channel matrix is described microbase station Uplink precoding matrix；
Described microbase station carries out sending after precoding to sent signal using described uplink precoding matrix To described macro base station.
Third aspect present invention provides a kind of macro base station, including：
Receiver module, for receiving the uplink pilot signal that N number of microbase station sends respectively, N be more than etc. In 2 positive integer；
First determining module, for the uplink pilot signal being sent according to kth microbase station receiving, Determine the uplink physical channel matrix of described kth microbase station, the value of k is 1,2 ... ..., N；
Second determining module, for the uplink physical channel matrix according to described N number of microbase station, determines institute State the uplink precoding matrix of N number of microbase station；
Described first determining module, is additionally operable to the uplink physical channel matrix according to described kth microbase station, Determine the down physical channel matrix of described kth microbase station；
3rd determining module, for the down physical channel matrix according to described kth microbase station, obtains The precancellation weights of the down channel of described kth microbase station；
Sending module, precancellation weights for the down channel using described kth microbase station and described The uplink precoding matrix of kth microbase station, carries out being sent to after precoding described to downbound pilot frequency signal Kth microbase station, makes the precancellation weights of the down channel of described kth microbase station by precoding Balance out with the down physical channel matrix of described kth microbase station, described kth microbase station receives Downbound pilot frequency signal in only include the uplink precoding matrix of described kth microbase station.
In conjunction with the third aspect, in the first possible implementation of the third aspect, described macro base station is also Including：Generation module and acquisition module；
Described receiver module, is additionally operable to receive the upward signal that described kth microbase station sends, described on It is pre that row signal is that described kth microbase station is carried out using the uplink precoding matrix of described kth microbase station Signal after coding；
Described generation module, for the uplink physical channel matrix according to described kth microbase station and described The uplink precoding matrix of kth microbase station, generates the up equivalent channel square of described kth microbase station Battle array；
Described acquisition module, for according to the up equivalent channel matrix of described kth microbase station to described Upward signal is demodulated.
In conjunction with the first possible implementation of the third aspect or the third aspect, the second of the third aspect In kind possible implementation, described 3rd determining module specifically for：
Calculate the precancellation weights G of the down channel of described kth microbase station using below equation_{k}：
G_{k}=(H'_{k})^{H}[H'_{k}(H'_{k})^{H}]^{1}, wherein, H '_{k}Down physical channel square for described kth microbase station Battle array.
In conjunction with the third aspect, the third aspect the first is any one to the possible implementation of second Kind, in the third possible implementation of the third aspect, described first determining module specifically for：
According to the uplink physical channel matrix of described kth microbase station, and described kth microbase station Up channel and the heterogeneite of down channel, obtain the down physical channel matrix of described kth microbase station.
In conjunction with the first any one to the third possible implementation of the third aspect, the 3rd In 4th kind of possible implementation of aspect, described generation module specifically for：
Generate the up equivalent channel matrix of described kth microbase station according to equation below：
Wherein, H_{k}For the uplink physical channel matrix of described kth microbase station, W_{k}For institute State the uplink precoding matrix of kth microbase station.
In conjunction with the third aspect, the third aspect the first is any one to the 4th kind of possible implementation Kind, in the 5th kind of possible implementation of the third aspect, described second determining module specifically for：
During ith iteration, when determining the uplink precoding matrix of described kth microbase station, According to the uplink physical channel matrix of other microbase stations in addition to described kth microbase station and described Uplink precoding matrix in the ith 1 time iterative process for other microbase stations, determines described kth microbase station The interference strength of the interference being subject to and interference radiating way, wherein, the initial value of k is that the initial value of 1, i is also 1, the initial value of the uplink precoding matrix of each microbase station is unit matrix；
The interference strength of the interference being subject to according to described kth microbase station and interference radiating way determine described kth The interference weights of the interference that individual microbase station is subject to；
The interference weights of the interference that described kth microbase station is subject to are applied to described kth microbase station On up channel, obtain the up equivalent channel matrix of described kth microbase station；
According to the up equivalent channel matrix of described kth microbase station, determine that described kth microbase station exists Uplink precoding matrix during ith iteration；
According to uplink precoding matrix during ith iteration for the described N number of microbase station and described The uplink physical channel matrix of nth microbase station determines ith iteration result；
Determine whether to terminate iterative process according to described ith iteration result；
If it is determined that end iterative process, then the uplink precoding matrix during ith iteration is made respectively Uplink precoding matrix for described N number of microbase station；
If it is determined that not terminating iterative process, then i plus one, carrying out next iteration.
In conjunction with the 5th kind of possible implementation of the third aspect, in the 6th kind of possible reality of the third aspect In existing mode, described second determining module specifically for：
Changed at the ith 1 time according to the uplink physical channel matrix of other microbase stations described, other microbase stations described Uplink precoding matrix during generation and the statistics covariance matrix of uplink interference, determine described other The interference matrix that microbase station produces；
Eigenvalues Decomposition is carried out to described interference matrix, obtains the interference that described kth microbase station is subject to Interference strength and interference radiating way.
Fourth aspect present invention provides a kind of microbase station, including：
Sending module, for sending uplink pilot signal to macro base station；
Receiver module, for receiving the downbound pilot frequency signal that described macro base station sends, described descending pilot frequency letter Number it is the uplink precoding matrix of the precancellation weights according to down channel for the described macro base station and described microbase station Signal after precoding is carried out to downbound pilot frequency signal, by the down channel of microbase station described in precoding The down physical channel matrix of precancellation weights and described microbase station balances out, in described downbound pilot frequency signal Only include the uplink precoding matrix of described microbase station；
Determining module, for carrying out letter according to the downbound pilot frequency signal receiving and described downbound pilot frequency signal Road is estimated to obtain described descending equivalent channel matrix, determines that described descending equivalent channel matrix is described micro base The uplink precoding matrix stood；
Described sending module, be also used for described uplink precoding matrix carry out to sent signal pre It is sent to described macro base station after coding.
Wireless communications method provided in an embodiment of the present invention, macro base station and microbase station, macro base station is getting After precoding matrix, determine the down physical channel matrix of kth microbase station, according to kth micro base The down physical channel matrix stood, obtains the precancellation weights of the down channel of kth microbase station, finally, Using precancellation weights and the uplink precoding matrix of down channel, precoding is carried out to downbound pilot frequency signal After be sent to kth microbase station, kth microbase station obtains descending equivalent channel matrix by channel estimation, Descending equivalent channel matrix is defined as the uplink precoding matrix of kth microbase station, and according to up pre Encoder matrix carries out up precoding.Because the uplink precoding matrix that microbase station gets is not pass through Quantify, therefore, microbase station can get highprecision uplink precoding matrix so that up prelist Code matrix is capable of the coupling up channel of optimum, thus improve the capacity of up channel.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality The accompanying drawing applying required use in example or description of the prior art be briefly described it should be apparent that, under Accompanying drawing in the description of face is some embodiments of the present invention, for those of ordinary skill in the art, On the premise of not paying creative labor, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the configuration diagram of wireless backhaul system；
The flow chart of the wireless communications method that Fig. 2 provides for the embodiment of the present invention one；
The flow chart of the wireless communications method that Fig. 3 provides for the embodiment of the present invention two；
The flow chart of the computational methods of the uplink precoding matrix that Fig. 4 provides for the embodiment of the present invention three；
The flow chart of the wireless communications method that Fig. 5 provides for the embodiment of the present invention four；
The structural representation of the macro base station that Fig. 6 provides for the embodiment of the present invention five；
The structural representation of the macro base station that Fig. 7 provides for the embodiment of the present invention six；
The structural representation of the microbase station that Fig. 8 provides for the embodiment of the present invention eight；
The structural representation of the macro base station that Fig. 9 provides for the embodiment of the present invention nine；
The structural representation of the microbase station that Figure 10 provides for the embodiment of the present invention ten.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with this Accompanying drawing in bright embodiment, is clearly and completely described to the technical scheme in the embodiment of the present invention, Obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained under the premise of not making creative work The every other embodiment obtaining, broadly falls into the scope of protection of the invention.
The method of the embodiment of the present invention is applied in wireless backhaul communications, and backhaul communication is macro base station and micro base Communication between standing, Fig. 1 is the configuration diagram of wireless backhaul system, as shown in figure 1, wireless backhaul System includes：Multiple macro base stations 11 and multiple microbase station 12.The coverage of macro base station 11 is big, micro base Stand 12 coverage very little, macro base station 11 carries out main covering, microbase station 12 be used for carrying out blind spot, Hot spot capacity and coverage enhancement.
The flow chart of the wireless communications method that Fig. 2 provides for the embodiment of the present invention one, as shown in Fig. 2 this The method that embodiment provides may comprise steps of：
Step 101, macro base station receive the uplink pilot signal that sends respectively of N number of microbase station, N be more than Positive integer equal to 2.
The uplink pilot signal that microbase station sends is the not pilot signal through precoding, each microbase station Can there are multiple antenna ports (Port), each antenna port sends a uplink pilot signal, each sky On line end mouth send uplink pilot signal can by code division, frequency division, when grading mode be distinguish between, The different pilot signal of each base station distribution.
The uplink pilot signal that step 102, macro base station send according to kth microbase station receiving, really The uplink physical channel matrix of fixed kth microbase station, the value of k is 1,2 ... ..., N.
Macro base station obtains each microbase station according to the uplink pilot signal that microbase station sends by channel estimation methods Uplink physical channel matrix, wherein, the uplink physical channel matrix of microbase station refers to macro base station and micro base The physical channel matrix of precoding weighting, the uplink physical channel matrix of kth microbase station is not done between standing Use H_{k}Represent.
Step 103, macro base station, according to the uplink physical channel matrix of N number of microbase station, determine N number of micro base The uplink precoding matrix stood.
The uplink precoding matrix of microbase station refers to the precoding matrix of the up channel of microbase station, macro base station Can be according to the uplink physical channel matrix of each microbase station, with each layer and maximum capacity or approximate criterion Make the uplink precoding matrix that conventional SUMIMO method for precoding obtains each microbase station, or, Macro base station according to the uplink physical channel matrix of each microbase station, with each layer and maximum capacity or approximate criterion Make the uplink precoding matrix that MUMIMO method for precoding obtains each microbase station.
Step 104, macro base station, according to the uplink physical channel matrix of kth microbase station, determine kth The down physical channel matrix of microbase station.
Macro base station can utilize kth microbase station uplink physical channel matrix, and up channel and under The heterogeneite of row channel obtains the down physical channel matrix of kth microbase station.For time division duplex (Time Division Duplexing, abbreviation TDD) system, the ascending physical signal of macro base station kth microbase station of calculating The transposed matrix of channel matrix, determines that the transposed matrix of the uplink physical channel matrix of kth microbase station is The down physical channel matrix of kth microbase station.The down physical channel matrix H ' of kth microbase station_{k} Represent, thenH‘_{k}Dimension beWherein,Represent the antenna of kth microbase station Quantity, N_{BS}Represent the antenna amount of macro base station.
Step 105, macro base station, according to the down physical channel matrix of kth microbase station, obtain kth The precancellation weights of the down channel of microbase station.
The down physical channel matrix being to offset kth microbase station is offset in the effect of precancellation weights, offsets The up precoding of kth microbase station is only included in the downbound pilot frequency signal that kth microbase station receives afterwards Matrix, kth microbase station just can get uplink precoding matrix by channel estimation.If do not entered Row is offset, and macro base station directly carries out downlink precoding using uplink precoding matrix, then kth micro base The downbound pilot frequency signal that station receives is uplink precoding matrix, down physical channel matrix and descending leads The superposition of frequency signal, microbase station cannot be by uplink precoding matrix, down physical channel by channel estimation Matrix distinguishes, therefore, it is impossible to obtain uplink precoding matrix.In the present embodiment, macro base station is according to The down physical channel matrix of k microbase station, obtains the precancellation power of the down channel of kth microbase station Value, then, precancellation weights and uplink precoding matrix using the down channel of kth microbase station enter Row precoding.
In a kind of implementation, macro base station can calculate the descending letter of kth microbase station using below equation The precancellation weights G in road_{k}：
G_{k}=(H'_{k})^{H}[H'_{k}(H'_{k})^{H}]^{1}, wherein, H '_{k}For the down physical channel matrix of kth microbase station, G_{k}Establishment needs to meet following condition：The antenna amount of macro base station is not less than the antenna number of kth microbase station Amount.However, it will be understood that the precancellation weights G of the down channel of kth microbase station_{k}Concrete Form is not limited to abovementioned formula, can also calculate by other means.
Step 106, macro base station use the precancellation weights of down channel of kth microbase station and kth The uplink precoding matrix of microbase station, carries out being sent to kth micro base after precoding to downbound pilot frequency signal Stand.
Make the precancellation weights of the down channel of kth microbase station and kth microbase station by precoding Down physical channel matrix balance out, only include in the downbound pilot frequency signal that kth microbase station receives The uplink precoding matrix of kth microbase station.
Can be by the uplink precoding matrix W of kth microbase station_{k}Weight as the 1st grade, micro by kth The precancellation weights G of the down channel of base station_{k}Classification weighting as the 2nd grade of weighting carries out precoding, grand Signal after the precoding of base station is expressed as G_{k}W_{k}S, s represent downbound pilot frequency signal.Signal warp after precoding Cross the downlink channel transmission of kth microbase station, then the downbound pilot frequency signal table that kth microbase station receives It is shown as y_{k}=H '_{k}G_{k}W_{k}S+u, u represent the interference of down channel.By G_{k}=(H'_{k})^{H}[H'_{k}(H'_{k})^{H}]^{1}Bring y into_{k} Obtain：
Can by formula To obtainWherein,Represent the descending equivalent channel matrix of kth microbase station.Microbase station exists After receiving downbound pilot frequency signal, carry out channel and estimate with downbound pilot frequency signal s according to after downbound pilot frequency signal Meter obtainsAnd u, due toTherefore, kth microbase station direct estimation obtainsAs upper Row precoding matrix W_{k}, then, according to uplink precoding matrix W_{k}Carry out up precoding.
In prior art, macro base station, after getting uplink precoding matrix, can carry out precoding matrix Quantify, obtain the corresponding code book of uplink precoding matrix, then, code book is sent to by micro base by signaling Stand, the quantization of precoding matrix can introduce error, lead to the precision of precoding matrix low.And the present embodiment In, macro base station, after getting precoding matrix, does not carry out the quantization of precoding matrix, but root According to the uplink physical channel matrix of kth microbase station, determine the down physical channel square of kth microbase station Battle array, according to the down physical channel matrix of described kth microbase station, obtains the descending of kth microbase station The precancellation weights of channel, finally, using the precancellation weights and of the down channel of kth microbase station The uplink precoding matrix of k microbase station, carries out to downbound pilot frequency signal being sent to kth after precoding Microbase station, due to the precancellation weights of the down channel by kth microbase station of precoding and kth micro The down physical channel matrix of base station balances out so that the downbound pilot frequency signal that receives of kth microbase station In only include the uplink precoding matrix of kth microbase station such that it is able to send uplink precoding matrix To microbase station.Because the uplink precoding matrix that macro base station sends is not through quantifying, therefore, micro Base station can get highprecision uplink precoding matrix so that uplink precoding matrix is capable of optimum Coupling up channel, thus improve the capacity of up channel.
The flow chart of the wireless communications method that Fig. 3 provides for the embodiment of the present invention two, as shown in figure 3, this The method that embodiment provides comprises the following steps：
Step 201, macro base station receive the uplink pilot signal that sends respectively of N number of microbase station, N be more than Positive integer equal to 2.
The uplink pilot signal that step 202, macro base station send according to kth microbase station receiving, really The uplink physical channel matrix of fixed kth microbase station, the value of k is 1,2 ... ..., N.
Step 203, macro base station, according to the uplink physical channel matrix of N number of microbase station, determine N number of micro base The uplink precoding matrix stood.
Step 204, macro base station, according to the uplink physical channel matrix of kth microbase station, determine kth The down physical channel matrix of microbase station.
Step 205, macro base station, according to the down physical channel matrix of kth microbase station, obtain kth The precancellation weights of the down channel of microbase station.
Step 206, macro base station use the precancellation weights of down channel of kth microbase station and kth The uplink precoding matrix of microbase station, carries out being sent to kth micro base after precoding to downbound pilot frequency signal Stand.
Make the precancellation weights of the down channel of kth microbase station and kth microbase station by precoding Down physical channel matrix balance out, only include in the downbound pilot frequency signal that kth microbase station receives The uplink precoding matrix of kth microbase station.
The specific implementation of step 201206 can refer to the implementation of embodiment one step 101106, Here repeat no more.
Step 207, macro base station receive the upward signal of kth microbase station transmission, and upward signal is kth Individual microbase station is treated sending signal using the uplink precoding matrix of kth microbase station and is carried out after precoding Signal.
Kth microbase station, after the downbound pilot frequency signal receiving macro base station transmission, carries out channel estimation and obtains To descending equivalent channel matrix, using descending equivalent channel matrix as uplink precoding matrix, then, K microbase station using uplink precoding matrix to sent signal carry out passing through after precoding kth micro The up channel of base station is sent to macro base station, and macro base station receives the upward signal of kth microbase station transmission. The upward signal that kth microbase station that macro base station receives sends can be expressed as：
y′_{k}=H_{k}W_{k}S '+u, wherein, H_{k}Represent the uplink physical channel matrix of kth microbase station, W_{k}Table Show the uplink precoding matrix of kth microbase station, s ' represents signal to be sent, u represents kth microbase station Up channel interference.
Step 208, macro base station are according to the uplink physical channel matrix of kth microbase station and kth micro base The uplink precoding matrix stood, generates the up equivalent channel matrix of kth microbase station.
The up equivalent channel matrix of kth microbase station is expressed as：
Step 209, macro base station obtain according to the up equivalent channel matrix of kth microbase station and upward signal To signal to be sent.
Macro base station is according to y '_{k}=H_{k}W_{k}S '+u andCarry out data demodulation and obtain signal s ' to be sent.
In the present embodiment, macro base station receives the upward signal that kth microbase station sends, and upward signal is the K microbase station carries out the signal after precoding using the uplink precoding matrix of kth microbase station, according to The uplink physical channel matrix of kth microbase station and the uplink precoding matrix of kth microbase station, generate The up equivalent channel matrix of kth microbase station, and the up equivalent channel square according to kth microbase station Upward signal is demodulated battle array such that it is able to the upward signal that sends of unsuccessful demodulation microbase station.Due to upper Row signal is that microbase station carries out the signal after precoding using the uplink precoding matrix that macro base station sends, because This is so that uplink precoding matrix is capable of the coupling up channel of optimum, thus improve up channel Capacity.
Based on the precoding mechanism of code book, except the quantization due to precoding matrix mentioned above can introduce Error, leads to the low problem of the precision of precoding matrix, also has one disadvantage in that：Available precoding codebook Number typically limited so that multiuser MIMO cannot effective cooperation, there is multiuser interference problem.Especially It is that interuser interference is even more serious in multiuser high order MIMO.Dry between multiuser in order to solve Disturb problem, on the basis of abovedescribed embodiment one and embodiment two, provide a kind of in the embodiment of the present invention three The computational methods of uplink precoding matrix, can disturb between uplink multiusers and make effective pretreatment and association Make, lift uplink multiusers space division multiplexing rate and spectrum efficiency.Fig. 4 for the embodiment of the present invention three provide upper The flow chart of the computational methods of row precoding matrix, as shown in figure 4, the method that the present embodiment provides includes Following steps：
Step 301, during ith iteration, macro base station determine the up of kth microbase station prelist During code matrix, macro base station is according to the uplink physical channel square of other microbase stations in addition to kth microbase station Battle array, and uplink precoding matrix in the ith 1 time iterative process for other microbase stations, determine kth micro The interference strength of the interference that base station is subject to and interference radiating way, wherein, the initial value of k is the initial value of 1, i Also it is 1, the initial value of the uplink precoding matrix of each microbase station is unit matrix.
In a kind of implementation, macro base station is according to the uplink physical channel matrix of other microbase stations, other are micro Uplink precoding matrix in the ith 1 time iterative process for the base station and the statistics covariance square of uplink interference Battle array, determines the interference matrix of the interference that kth microbase station is subject to；Then, feature is carried out to interference matrix Value is decomposed, and obtains the interference strength of interference and interference radiating way that kth microbase station is subject to.
Wherein, the interference matrix of the interference that kth microbase station is subject to can be calculated by equation below：J=1,2 ... ..., N, and j ≠ k, H_{j}Represent jth microbase station Uplink physical channel matrix,Represent that up in the ith 1 time iterative process of jth microbase station prelists Code matrix, I represents the statistics covariance matrix of uplink interference.
Interference matrix can be expressed as after carrying out Eigenvalues DecompositionWherein, U_{k}For The interference radiating way of the interference that kth microbase station is subject to, D_{k}The disturbing of the interference being subject to for kth microbase station Intensity.
So that N is equal to 2 as a example, that is, have two microbase stations, then in first time iterative process, macro base station The signal receiving isIn expression first time iterative process, the 1st microbase station is upper Row physical channel matrix,Represent the uplink physical channel square of the 1st microbase station in first time iterative process Battle array, u represents the uplink interference of the 1st microbase station.Macro base station is by each layer and maximum capacity or approximate Criterion is made conventional SUMIMO method for precoding and is obtainedIt is special that concrete grammar includes but is not limited to channel Levy decomposition and power water filling etc. it is assumed that reusable space division number of plies N after precoding_{L}, thenDimension beRepresent the antenna amount of the 1st microbase station.
ObtainingAfterwards, macro base station obtains according to abovementioned formulaThen to R_{1} Carry out Eigenvalues Decomposition：EVD(R_{1})=U_{1}D_{1}U_{1} ^{H}, wherein, U_{1}Represent that the 1st microbase station is subject to dry Disturb direction, D_{1}Represent the 1st interference strength that microbase station is subject to.
The interference strength of the interference that step 302, macro base station are subject to according to kth microbase station and interference radiating way Determine the interference weights of the interference that kth microbase station is subject to.
Interference weights specifically can calculate in the following manner：U_{k}It is subject to for kth microbase station The interference radiating way of the interference arrived, D_{k}The interference strength of the interference being subject to for kth microbase station.
The interference weights of the interference that kth microbase station is subject to by step 303, macro base station are applied to kth On the up channel of microbase station, obtain the up equivalent channel matrix of kth microbase station.
The up equivalent channel matrix of kth microbase station can be calculated by equation below：H_{k} The channel matrix of the up channel of kth microbase station, G_{k}Represent the dry of the interference that kth microbase station is subject to Disturb weights.
Step 304, macro base station, according to the up equivalent channel matrix of kth microbase station, determine kth Uplink precoding matrix during ith iteration for the microbase station.
Kth microbase station uplink precoding matrix during ith iteration can be expressed as：Represent withAs channel matrix and additive noise covariance For the single user precoding matrix computational methods under the conditions of unit battle array.
Step 305, the macro base station up precoding square during ith iteration according to N number of microbase station Battle array, and the uplink physical channel matrix of nth microbase station determines ith iteration result.
Ith iteration result with capacity and can represent, wherein, capacity and equation below meter can be passed through Calculate：Operator   represent the determinant of calculating matrix.
Step 306, macro base station determine whether to terminate iterative process according to ith iteration result.
Specifically, can be compared by the capacity during ith iteration with the expected value of setting, If the capacity during ith iteration and more than or equal to expected value it is determined that terminate iterative process, hold Row step 307, if the capacity during ith iteration and less than expected value it is determined that not terminating iteration mistake Journey, execution step 308.Or, by the capacity during ith iteration and with the ith 1 time iterative process In capacity and be compared, if the difference of the capacity sum twice in iterative process is less than preset value, really Surely terminate iterative process, if the difference of the capacity sum twice in iterative process is more than or equal to preset value, Determine and do not terminate iterative process.
Step 307, using the uplink precoding matrix during ith iteration as N number of microbase station Uplink precoding matrix.
Step 308, i plus one, carry out next iteration.
In the present embodiment, the signal that certain microbase station is alternately sent by macro base station, will used as echo signal The signal that other microbase stations send as interference, determines the up of each microbase station in the case of multiuser interference Precoding matrix makees effective pretreatment and cooperation, in lifting such that it is able to disturb between uplink multiusers Row multipleuser space division multiplexing rate and spectrum efficiency, point out the capacity of up channel further.
The flow chart of the wireless communications method that Fig. 5 provides for the embodiment of the present invention four, as shown in figure 5, this The method that embodiment provides comprises the following steps：
Step 401, microbase station send uplink pilot signal to macro base station.
The uplink pilot signal that microbase station sends is not through precoding.
Step 402, microbase station receive the downbound pilot frequency signal that macro base station sends, and downbound pilot frequency signal is grand Base station is according to the precancellation weights of down channel and the uplink precoding matrix of microbase station to downbound pilot frequency signal Carry out the signal after precoding, by precancellation weights and the microbase station of the down channel of precoding microbase station Down physical channel matrix balance out, only include the up precoding square of microbase station in downbound pilot frequency signal Battle array.
Step 403, microbase station carry out channel according to the downbound pilot frequency signal receiving and downbound pilot frequency signal Estimate to obtain descending equivalent channel matrix, determine the up precoding that descending equivalent channel matrix is microbase station Matrix.
Step 404, microbase station carry out sending out after precoding to sent signal using uplink precoding matrix Give macro base station.
The specific implementation of the present embodiment can refer to the associated description of embodiment two, repeats no more here.
In the present embodiment, microbase station receives the downbound pilot frequency signal that macro base station sends, according to receiving down Row pilot signal and downbound pilot frequency signal carry out channel estimation and obtain descending equivalent channel matrix, determine descending Equivalent channel matrix be microbase station uplink precoding matrix, using uplink precoding matrix to sent Signal is sent to macro base station after carrying out precoding.Because upward signal is that microbase station uses macro base station to send Uplink precoding matrix carries out the signal after precoding, therefore so that uplink precoding matrix can be optimum Coupling up channel, thus improve the capacity of up channel.
The structural representation of the macro base station that Fig. 6 provides for the embodiment of the present invention five, as shown in fig. 6, this reality The macro base station applying example offer includes：Receiver module 21, the first determining module 22, the second determining module 23, 3rd determining module 24 and sending module 25.
Wherein, receiver module 21, for receiving the uplink pilot signal that N number of microbase station sends respectively, N It is the positive integer more than or equal to 2；
First determining module 22, for the uplink pilot signal being sent according to kth microbase station receiving, Determine the uplink physical channel matrix of described kth microbase station, the value of k is 1,2 ... ..., N；
Second determining module 23, for the uplink physical channel matrix according to described N number of microbase station, determines The uplink precoding matrix of described N number of microbase station；
Described first determining module 22, is additionally operable to the uplink physical channel square according to described kth microbase station Battle array, determines the down physical channel matrix of described kth microbase station；
3rd determining module 24, for the down physical channel matrix according to described kth microbase station, obtains Precancellation weights to the down channel of described kth microbase station；
Sending module 25, the precancellation weights for the down channel using described kth microbase station and institute State the uplink precoding matrix of kth microbase station, downbound pilot frequency signal is carried out be sent to after precoding with institute State kth microbase station, make the precancellation power of the down channel of described kth microbase station by precoding The down physical channel matrix of value and described kth microbase station balances out, and described kth microbase station receives To downbound pilot frequency signal in only include the uplink precoding matrix of described kth microbase station.
Optionally, described 3rd determining module 24 specifically for：
Calculate the precancellation weights G of the down channel of described kth microbase station using below equation_{k}：
G_{k}=(H'_{k})^{H}[H'_{k}(H'_{k})^{H}]^{1}, wherein, H '_{k}Down physical channel square for described kth microbase station Battle array.
Optionally, described first determining module specifically for：Ascending according to described kth microbase station Reason channel matrix, and the up channel of described kth microbase station and the heterogeneite of down channel, obtain The down physical channel matrix of described kth microbase station.
The present embodiment provide macro base station, can be used for execute embodiment one method, specific implementation and Technique effect is similar to, and repeats no more here.
The structural representation of the macro base station that Fig. 7 provides for the embodiment of the present invention six, as shown in fig. 7, this reality The macro base station applying example offer also includes on the basis of shown in Fig. 6：Generation module 26 and acquisition module 27.
Described receiver module 21, is additionally operable to receive the upward signal that described kth microbase station sends, described Upward signal is that described kth microbase station is carried out using the uplink precoding matrix of described kth microbase station Signal after precoding；
Described generation module 26, for the uplink physical channel matrix according to described kth microbase station and institute State the uplink precoding matrix of kth microbase station, generate the up equivalent channel of described kth microbase station Matrix；
Described acquisition module 27, for according to the up equivalent channel matrix of described kth microbase station to institute State upward signal to be demodulated.
Optionally, described generation module 26 specifically for：
Generate the up equivalent channel matrix of described kth microbase station according to equation below：
Wherein, H_{k}For the uplink physical channel matrix of described kth microbase station, W_{k}For institute State the uplink precoding matrix of kth microbase station.
The present embodiment provide macro base station, can be used for execute embodiment two method, specific implementation and Technique effect is similar to, and repeats no more here.
The embodiment of the present invention seven provides a kind of macro base station, and the structure of the macro base station of the present embodiment refer to Fig. 7 Shown macro base station, on the basis of embodiment six, in the present embodiment, described second determining module 23 has Body is used for：
During ith iteration, when determining the uplink precoding matrix of described kth microbase station, According to the uplink physical channel matrix of other microbase stations in addition to described kth microbase station and described Uplink precoding matrix in the ith 1 time iterative process for other microbase stations, determines described kth microbase station The interference strength of the interference being subject to and interference radiating way, wherein, the initial value of k is that the initial value of 1, i is also 1, the initial value of the uplink precoding matrix of each microbase station is unit matrix；
The interference strength of the interference being subject to according to described kth microbase station and interference radiating way determine described kth The interference weights of the interference that individual microbase station is subject to；
The interference weights of the interference that described kth microbase station is subject to are applied to described kth microbase station On up channel, obtain the up equivalent channel matrix of described kth microbase station；
According to the up equivalent channel matrix of described kth microbase station, determine that described kth microbase station exists Uplink precoding matrix during ith iteration；
According to uplink precoding matrix during ith iteration for the described N number of microbase station and described The uplink physical channel matrix of nth microbase station determines ith iteration result；
Determine whether to terminate iterative process according to described ith iteration result；
If it is determined that end iterative process, then the uplink precoding matrix during ith iteration is made respectively Uplink precoding matrix for described N number of microbase station；
If it is determined that not terminating iterative process, then i plus one, carrying out next iteration.
Optionally, when the interference strength of the interference being subject in described kth microbase station of determination and interference radiating way, Described second determining module specifically for：Uplink physical channel matrix, institute according to other microbase stations described State the statistics of uplink precoding matrix in the ith 1 time iterative process for other microbase stations and uplink interference Covariance matrix, determines the interference matrix that other microbase stations described produce；Spy is carried out to described interference matrix Value indicative is decomposed, and obtains the interference strength of interference and interference radiating way that described kth microbase station is subject to.
The present embodiment provide macro base station, can be used for execute embodiment three method, specific implementation and Technique effect is similar to, and repeats no more here.
The structural representation of the microbase station that Fig. 8 provides for the embodiment of the present invention eight, as shown in figure 8, this reality The microbase station applying example offer includes：Sending module 31, receiver module 32 and determining module 33.
Wherein, sending module 31, for sending uplink pilot signal to macro base station；
Receiver module 32, for receiving the downbound pilot frequency signal that described macro base station sends, described descending pilot frequency Signal is the up precoding square of the precancellation weights according to down channel for the described macro base station and described microbase station Battle array carries out the signal after precoding to downbound pilot frequency signal, by the down channel of microbase station described in precoding Precancellation weights and the down physical channel matrix of described microbase station balance out, described downbound pilot frequency signal In only include the uplink precoding matrix of described microbase station；
Determining module 33, for carrying out according to the downbound pilot frequency signal receiving and described downbound pilot frequency signal Channel estimation obtains described descending equivalent channel matrix, determines that described descending equivalent channel matrix is described micro The uplink precoding matrix of base station；
Described sending module 31, is also used for described uplink precoding matrix and carries out to sent signal It is sent to described macro base station after precoding.
The present embodiment provide microbase station, can be used for execute example IV method, specific implementation and Technique effect is similar to, and repeats no more here.
The structural representation of the macro base station that Fig. 9 provides for the embodiment of the present invention nine, as shown in figure 9, this reality The macro base station 400 applying example offer includes：Emitter 41, receptor 42, processor 43 and memorizer 44, Described emitter 41, receptor 42, memorizer 44 are connected simultaneously with described processor 43 by system bus Communication；Described memorizer 44, for storing computer executed instructions；Described processor 43, for running Described computer executed instructions.
Wherein, described receptor 42 is used for receiving the uplink pilot signal that N number of microbase station sends respectively, N It is the positive integer more than or equal to 2.
Described processor 43 is used for：The uplink pilot signal that kth microbase station according to receiving sends, Determine the uplink physical channel matrix of described kth microbase station, the value of k is 1,2 ... ..., N；
According to the uplink physical channel matrix of described N number of microbase station, determine the up of described N number of microbase station Precoding matrix；
According to the uplink physical channel matrix of described kth microbase station, determine described kth microbase station Down physical channel matrix；
According to the down physical channel matrix of described kth microbase station, obtain described kth microbase station The precancellation weights of down channel.
Described emitter 41 is used for precancellation weights and the institute of the down channel using described kth microbase station State the uplink precoding matrix of kth microbase station, downbound pilot frequency signal is carried out be sent to after precoding with institute State kth microbase station, make the precancellation power of the down channel of described kth microbase station by precoding The down physical channel matrix of value and described kth microbase station balances out, and described kth microbase station receives To downbound pilot frequency signal in only include the uplink precoding matrix of described kth microbase station.
Described receptor 42 is additionally operable to receive the upward signal that described kth microbase station sends, described up Signal is that described kth microbase station uses the uplink precoding matrix of described kth microbase station to be sent Signal carries out the signal after precoding；
Described processor 43 is additionally operable to：Uplink physical channel matrix according to described kth microbase station and institute State the uplink precoding matrix of kth microbase station, generate the up equivalent channel of described kth microbase station Matrix；Described in up equivalent channel matrix according to described kth microbase station and described upward signal obtain Signal to be sent.
Optionally, described processor 43, according to the down physical channel matrix of described kth microbase station, obtains To the precancellation weights of the down channel of described kth microbase station, specially：
Calculate the precancellation weights G of the down channel of described kth microbase station using below equation_{k}：
G_{k}=(H'_{k})^{H}[H'_{k}(H'_{k})^{H}]^{1}, wherein, H '_{k}Down physical channel square for described kth microbase station Battle array.
Optionally, described processor 43 is according to the uplink physical channel matrix of described kth microbase station, really The down physical channel matrix of fixed described kth microbase station, specially：
According to the uplink physical channel matrix of described kth microbase station, and described kth microbase station Up channel and the heterogeneite of down channel, obtain the down physical channel matrix of described kth microbase station.
Optionally, described processor 43 is according to the uplink physical channel matrix of described kth microbase station and institute State the uplink precoding matrix of kth microbase station, generate the up equivalent channel of described kth microbase station Matrix, specially：
Generate the up equivalent channel matrix of described kth microbase station according to equation below：
Wherein, H_{k}For the uplink physical channel matrix of described kth microbase station, W_{k}For institute State the uplink precoding matrix of kth microbase station.
Optionally, described processor 43 is according to the uplink physical channel matrix of described N number of microbase station, really The uplink precoding matrix of fixed described N number of microbase station, specially：
During ith iteration, when determining the uplink precoding matrix of described kth microbase station, Described macro base station is according to the uplink physical channel square of other microbase stations in addition to described kth microbase station Battle array, and uplink precoding matrix in the ith 1 time iterative process for other microbase stations described, determine described The interference strength of interference and interference radiating way that kth microbase station is subject to, wherein, the initial value of k is 1, i Initial value be also 1, the initial value of the uplink precoding matrix of each microbase station is unit matrix；
The interference strength of the interference being subject to according to described kth microbase station and interference radiating way determine described kth The interference weights of the interference that individual microbase station is subject to；
The interference weights of the interference that described kth microbase station is subject to are applied to described kth microbase station On up channel, obtain the up equivalent channel matrix of described kth microbase station；
According to the up equivalent channel matrix of described kth microbase station, determine that described kth microbase station exists Uplink precoding matrix during ith iteration；
According to uplink precoding matrix during ith iteration for the described N number of microbase station and described The uplink physical channel matrix of nth microbase station determines ith iteration result；
Determine whether to terminate iterative process according to described ith iteration result；
If it is determined that end iterative process, then the uplink precoding matrix during ith iteration is made respectively Uplink precoding matrix for described N number of microbase station；
If it is determined that not terminating iterative process, then i plus one, carrying out next iteration.
Optionally, described processor 43 is upper according to other microbase stations in addition to described kth microbase station Row physical channel matrix, and up precoding square in the ith 1 time iterative process for other microbase stations described Battle array, determines the interference strength of interference and interference radiating way that described kth microbase station be subject to, specially：
Changed at the ith 1 time according to the uplink physical channel matrix of other microbase stations described, other microbase stations described Uplink precoding matrix during generation and the statistics covariance matrix of uplink interference, determine described kth The interference matrix of the interference that individual microbase station is subject to；Eigenvalues Decomposition is carried out to described interference matrix, obtains institute State the interference strength of interference and the interference radiating way that kth microbase station is subject to.
The macro base station of the present embodiment, can be used for executing embodiment one to the scheme of embodiment three, implements Mode is similar with technique effect, repeats no more here.
The structural representation of the microbase station that Figure 10 provides for the embodiment of the present invention ten, as shown in Figure 10, this The microbase station 500 that embodiment provides includes：Emitter 51, receptor 52, processor 53 and memorizer 54, described emitter 51, receptor 52, memorizer 54 pass through system bus with described processor 53 even Connect and communicate；Described memorizer 54, for storing computer executed instructions；Described processor 53, is used for Run described computer executed instructions.
Wherein, described emitter 51 is used for sending uplink pilot signal to macro base station；
Described receptor 52 is used for receiving the downbound pilot frequency signal that described macro base station sends, described descending pilot frequency Signal is the up precoding square of the precancellation weights according to down channel for the described macro base station and described microbase station Battle array carries out the signal after precoding to downbound pilot frequency signal, by the down channel of microbase station described in precoding Precancellation weights and the down physical channel matrix of described microbase station balance out, described downbound pilot frequency signal In only include the uplink precoding matrix of described microbase station；
Described processor 53 is used for being entered according to the downbound pilot frequency signal receiving and described downbound pilot frequency signal Row channel estimation obtains described descending equivalent channel matrix, determines that described descending equivalent channel matrix is described The uplink precoding matrix of microbase station；
Described emitter 51 be also used for described uplink precoding matrix carry out to sent signal pre It is sent to described macro base station after coding.
The microbase station of the present embodiment, can be used for executing scheme, specific implementation and the technology of example IV Effect is similar to, and repeats no more here.
One of ordinary skill in the art will appreciate that：Realize all or part step of abovementioned each method embodiment Suddenly can be completed by the related hardware of programmed instruction.Aforesaid program can be stored in a computer can Read in storage medium.This program upon execution, executes the step including abovementioned each method embodiment；And Aforesaid storage medium includes：ROM, RAM, magnetic disc or CD etc. are various can be with store program codes Medium.
Finally it should be noted that：Various embodiments above is only in order to illustrating technical scheme rather than right It limits；Although being described in detail to the present invention with reference to foregoing embodiments, this area common Technical staff should be understood：It still can be modified to the technical scheme described in foregoing embodiments, Or equivalent is carried out to wherein some or all of technical characteristic；And these modifications or replacement, and Do not make the scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.
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