CN106411372A - Wireless communication method, macro base station and pico base station - Google Patents

Wireless communication method, macro base station and pico base station Download PDF

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Publication number
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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China
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base station
described
micro
th
uplink
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CN201510466747.0A
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Chinese (zh)
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CN106411372B (en
Inventor
徐剑标
夏欣
张伟
易雄书
吕磊
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华为技术有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna 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
    • H04B7/0619Diversity systems; Multi-antenna 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
    • H04B7/0636Feedback format
    • H04B7/0639Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24Cell structures
    • H04W16/32Hierarchical cell structures

Abstract

The embodiment of the invention provides a wireless communication method, a macro base station and a pico base station. The method is characterized in that: after acquiring a precoding matrix, the macro base station determines the downlink physical channel matrix of a kth pico base station, the macro base station obtains the pre-offset weight value of the downlink channel of the kth pico base station according to the downlink physical channel matrix of the kth pico base station; the macro base station, by using the pre-offset weight value of the downlink channel and an uplink precoding matrix, precodes a downlink pilot signal and then sends the pilot signal to the kth pico base station; the kth pico base station obtains a downlink equivalent channel matrix through channel estimation, determines the downlink equivalent channel matrix as the uplink precoding matrix of the kth pico base station, and performs uplink precoding according to the uplink precoding matrix. Since the uplink precoding matrix obtained by the pico base station is not quantified, the pico base station can obtain the high-precision uplink precoding matrix so that the uplink precoding matrix can best match the uplink channel, thereby increasing the capacity of the uplink channel.

Description

Wireless communications method, macro base station and micro-base station

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 Micro-group net passes through macro base station (Macro Base Station) and micro-base station (Pico Base Station) is common With the mode covering networking, micro-base station is also referred to as little base station, and micro-base station effect is by blind spot, focus holds Amount and coverage enhancement.Can be connected using wire-line back haul between macro base station and micro-base station and/or wireless backhaul connects Tap into row communication.

In wireless backhaul communications up-link, generally adopt multiple-input and multiple-output (Multiple-Input Multiple-Output, 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 micro-base 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 micro-base station, micro- base Stand and quantify to choose corresponding pre-coding matrix code book from precoding according to PMI, entered according to pre-coding 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 micro-base station, and macro base station can be by High-precision uplink pre-coding matrix is sent to micro-base station so that uplink pre-coding 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 micro-base 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 k-th micro-base station receiving, determines described The uplink physical channel matrix of k-th micro-base 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 micro-base station, determines described N number of micro- The uplink pre-coding matrix of base station;

Described macro base station, according to the uplink physical channel matrix of described k-th micro-base station, determines described kth The down physical channel matrix of individual micro-base station;

Described macro base station, according to the down physical channel matrix of described k-th micro-base station, obtains described kth The pre-cancellation weights of the down channel of individual micro-base station;

Described macro base station uses the pre-cancellation weights of down channel of described k-th micro-base station and described kth The uplink pre-coding matrix of individual micro-base station, carries out being sent to described kth after precoding to down-bound pilot frequency signal Individual micro-base station, makes pre-cancellation weights and the institute of the down channel of described k-th micro-base station by precoding The down physical channel matrix stating k-th micro-base station balances out, and described k-th micro-base station receives down The uplink pre-coding matrix of described k-th micro-base 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 k-th micro-base station sends, and described upward signal is institute State k-th micro-base station and treat sending signal using the uplink pre-coding matrix of described k-th micro-base station and carry out Signal after precoding;

Described macro base station according to the uplink physical channel matrix of described k-th micro-base station and described k-th micro- The uplink pre-coding matrix of base station, generates the up equivalent channel matrix of described k-th micro-base station;

Described macro base station is according to the up equivalent channel matrix of described k-th micro-base 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 k-th micro-base station Battle array, obtains the pre-cancellation weights of the down channel of described k-th micro-base station, including:

Described macro base station uses below equation to calculate the pre-cancellation power of the down channel of described k-th micro-base station Value Gk

Gk=(H'k)H[H'k(H'k)H]-1, wherein, H 'kDown physical channel square for described k-th micro-base 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 k-th The uplink physical channel matrix of base station, determines the down physical channel matrix of described k-th micro-base station, bag Include:

Described macro base station is according to the uplink physical channel matrix of described k-th micro-base station, and described kth The up channel of individual micro-base station and the heterogeneite of down channel, obtain the descending thing of described k-th micro-base 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 k-th micro-base station Physical channel matrix and the uplink pre-coding matrix of described k-th micro-base station, generate described k-th micro- base The up equivalent channel matrix stood, including:

Described macro base station generates the up equivalent channel matrix of described k-th micro-base station according to equation below:

Wherein, HkFor the uplink physical channel matrix of described k-th micro-base station, WkFor institute State the uplink pre-coding matrix of k-th micro-base 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 pre-coding matrix of described N number of micro-base station, including:

During ith iteration, described macro base station prelists in determination the up of described k-th micro-base station During code matrix, described macro base station is according to the ascending of other micro-base stations in addition to described k-th micro-base station Reason channel matrix, and uplink pre-coding matrix in the i-th -1 time iterative process for other micro-base stations described, Determine the interference strength of interference and interference radiating way that described k-th micro-base 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 pre-coding matrix of each micro-base station is unit square Battle array;

The interference strength of the interference that described macro base station is subject to according to described k-th micro-base station and interference radiating way are true The interference weights of the interference that fixed described k-th micro-base station is subject to;

The interference weights of the interference that described k-th micro-base station is subject to by described macro base station are applied to described kth On the up channel of individual micro-base station, obtain the up equivalent channel matrix of described k-th micro-base station;

Described macro base station, according to the up equivalent channel matrix of described k-th micro-base station, determines described kth Uplink pre-coding matrix during ith iteration for the individual micro-base station;

Described macro base station uplink pre-coding matrix during ith iteration according to described N number of micro-base station, And the uplink physical channel matrix of described n-th micro-base 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 pre-coding matrix during ith iteration is made respectively Uplink pre-coding matrix for described N number of micro-base 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 micro-base stations in addition to described k-th micro-base station Reason channel matrix, and uplink pre-coding matrix in the i-th -1 time iterative process for other micro-base stations described, Determine the interference strength of interference and interference radiating way that described k-th micro-base station be subject to, including:

Described macro base station is according to the uplink physical channel matrix of other micro-base stations described, other micro-base stations described The statistics covariance matrix of the uplink pre-coding matrix in the i-th -1 time iterative process and uplink interference, really The interference matrix that fixed other micro-base stations described produce;

Described macro base station carries out Eigenvalues Decomposition to described interference matrix, obtains described k-th micro-base 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:

Micro-base station sends uplink pilot signal to macro base station;

Described micro-base station receives the down-bound pilot frequency signal that described macro base station sends, and described down-bound pilot frequency signal is Described macro base station according to the pre-cancellation weights of down channel and the uplink pre-coding matrix of described micro-base station under Row pilot signal carries out the signal after precoding, is supported by the pre- of down channel of micro-base station described in precoding The down physical channel matrix of weights and the described micro-base station of disappearing balances out, and only wraps in described down-bound pilot frequency signal Include the uplink pre-coding matrix of described micro-base station;

Described micro-base station carries out channel according to the down-bound pilot frequency signal receiving and described down-bound pilot frequency signal and estimates Meter obtains described descending equivalent channel matrix, determines that described descending equivalent channel matrix is described micro-base station Uplink pre-coding matrix;

Described micro-base station carries out sending after precoding to sent signal using described uplink pre-coding 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 micro-base station sends respectively, N be more than etc. In 2 positive integer;

First determining module, for the uplink pilot signal being sent according to k-th micro-base station receiving, Determine the uplink physical channel matrix of described k-th micro-base station, the value of k is 1,2 ... ..., N;

Second determining module, for the uplink physical channel matrix according to described N number of micro-base station, determines institute State the uplink pre-coding matrix of N number of micro-base station;

Described first determining module, is additionally operable to the uplink physical channel matrix according to described k-th micro-base station, Determine the down physical channel matrix of described k-th micro-base station;

3rd determining module, for the down physical channel matrix according to described k-th micro-base station, obtains The pre-cancellation weights of the down channel of described k-th micro-base station;

Sending module, pre-cancellation weights for the down channel using described k-th micro-base station and described The uplink pre-coding matrix of k-th micro-base station, carries out being sent to after precoding described to down-bound pilot frequency signal K-th micro-base station, makes the pre-cancellation weights of the down channel of described k-th micro-base station by precoding Balance out with the down physical channel matrix of described k-th micro-base station, described k-th micro-base station receives Down-bound pilot frequency signal in only include the uplink pre-coding matrix of described k-th micro-base 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 k-th micro-base station sends, described on It is pre- that row signal is that described k-th micro-base station is carried out using the uplink pre-coding matrix of described k-th micro-base station Signal after coding;

Described generation module, for the uplink physical channel matrix according to described k-th micro-base station and described The uplink pre-coding matrix of k-th micro-base station, generates the up equivalent channel square of described k-th micro-base station Battle array;

Described acquisition module, for according to the up equivalent channel matrix of described k-th micro-base 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 pre-cancellation weights G of the down channel of described k-th micro-base station using below equationk

Gk=(H'k)H[H'k(H'k)H]-1, wherein, H 'kDown physical channel square for described k-th micro-base 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 k-th micro-base station, and described k-th micro-base station Up channel and the heterogeneite of down channel, obtain the down physical channel matrix of described k-th micro-base 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 k-th micro-base station according to equation below:

Wherein, HkFor the uplink physical channel matrix of described k-th micro-base station, WkFor institute State the uplink pre-coding matrix of k-th micro-base 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 pre-coding matrix of described k-th micro-base station, According to the uplink physical channel matrix of other micro-base stations in addition to described k-th micro-base station and described Uplink pre-coding matrix in the i-th -1 time iterative process for other micro-base stations, determines described k-th micro-base 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 pre-coding matrix of each micro-base station is unit matrix;

The interference strength of the interference being subject to according to described k-th micro-base station and interference radiating way determine described kth The interference weights of the interference that individual micro-base station is subject to;

The interference weights of the interference that described k-th micro-base station is subject to are applied to described k-th micro-base station On up channel, obtain the up equivalent channel matrix of described k-th micro-base station;

According to the up equivalent channel matrix of described k-th micro-base station, determine that described k-th micro-base station exists Uplink pre-coding matrix during ith iteration;

According to uplink pre-coding matrix during ith iteration for the described N number of micro-base station and described The uplink physical channel matrix of n-th micro-base 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 pre-coding matrix during ith iteration is made respectively Uplink pre-coding matrix for described N number of micro-base 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 i-th -1 time according to the uplink physical channel matrix of other micro-base stations described, other micro-base stations described Uplink pre-coding matrix during generation and the statistics covariance matrix of uplink interference, determine described other The interference matrix that micro-base station produces;

Eigenvalues Decomposition is carried out to described interference matrix, obtains the interference that described k-th micro-base station is subject to Interference strength and interference radiating way.

Fourth aspect present invention provides a kind of micro-base station, including:

Sending module, for sending uplink pilot signal to macro base station;

Receiver module, for receiving the down-bound pilot frequency signal that described macro base station sends, described descending pilot frequency letter Number it is the uplink pre-coding matrix of the pre-cancellation weights according to down channel for the described macro base station and described micro-base station Signal after precoding is carried out to down-bound pilot frequency signal, by the down channel of micro-base station described in precoding The down physical channel matrix of pre-cancellation weights and described micro-base station balances out, in described down-bound pilot frequency signal Only include the uplink pre-coding matrix of described micro-base station;

Determining module, for carrying out letter according to the down-bound pilot frequency signal receiving and described down-bound 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 pre-coding matrix stood;

Described sending module, be also used for described uplink pre-coding 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 micro-base station, macro base station is getting After pre-coding matrix, determine the down physical channel matrix of k-th micro-base station, according to k-th micro- base The down physical channel matrix stood, obtains the pre-cancellation weights of the down channel of k-th micro-base station, finally, Using pre-cancellation weights and the uplink pre-coding matrix of down channel, precoding is carried out to down-bound pilot frequency signal After be sent to k-th micro-base station, k-th micro-base station obtains descending equivalent channel matrix by channel estimation, Descending equivalent channel matrix is defined as the uplink pre-coding matrix of k-th micro-base station, and according to up pre- Encoder matrix carries out up precoding.Because the uplink pre-coding matrix that micro-base station gets is not pass through Quantify, therefore, micro-base station can get high-precision uplink pre-coding 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 pre-coding 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 micro-base 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 micro-base 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 micro-base 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, micro-base 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 micro-base station, N be more than Positive integer equal to 2.

The uplink pilot signal that micro-base station sends is the not pilot signal through precoding, each micro-base 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 k-th micro-base station receiving, really The uplink physical channel matrix of fixed k-th micro-base station, the value of k is 1,2 ... ..., N.

Macro base station obtains each micro-base station according to the uplink pilot signal that micro-base station sends by channel estimation methods Uplink physical channel matrix, wherein, the uplink physical channel matrix of micro-base station refers to macro base station and micro- base The physical channel matrix of precoding weighting, the uplink physical channel matrix of k-th micro-base station is not done between standing Use HkRepresent.

Step 103, macro base station, according to the uplink physical channel matrix of N number of micro-base station, determine N number of micro- base The uplink pre-coding matrix stood.

The uplink pre-coding matrix of micro-base station refers to the pre-coding matrix of the up channel of micro-base station, macro base station Can be according to the uplink physical channel matrix of each micro-base station, with each layer and maximum capacity or approximate criterion Make the uplink pre-coding matrix that conventional SU-MIMO method for precoding obtains each micro-base station, or, Macro base station according to the uplink physical channel matrix of each micro-base station, with each layer and maximum capacity or approximate criterion Make the uplink pre-coding matrix that MU-MIMO method for precoding obtains each micro-base station.

Step 104, macro base station, according to the uplink physical channel matrix of k-th micro-base station, determine k-th The down physical channel matrix of micro-base station.

Macro base station can utilize k-th micro-base station uplink physical channel matrix, and up channel and under The heterogeneite of row channel obtains the down physical channel matrix of k-th micro-base station.For time division duplex (Time Division Duplexing, abbreviation TDD) system, the ascending physical signal of macro base station k-th micro-base station of calculating The transposed matrix of channel matrix, determines that the transposed matrix of the uplink physical channel matrix of k-th micro-base station is The down physical channel matrix of k-th micro-base station.The down physical channel matrix H ' of k-th micro-base stationk Represent, thenH‘kDimension beWherein,Represent the antenna of k-th micro-base station Quantity, NBSRepresent the antenna amount of macro base station.

Step 105, macro base station, according to the down physical channel matrix of k-th micro-base station, obtain k-th The pre-cancellation weights of the down channel of micro-base station.

The down physical channel matrix being to offset k-th micro-base station is offset in the effect of pre-cancellation weights, offsets The up precoding of k-th micro-base station is only included in the down-bound pilot frequency signal that k-th micro-base station receives afterwards Matrix, k-th micro-base station just can get uplink pre-coding matrix by channel estimation.If do not entered Row is offset, and macro base station directly carries out downlink precoding using uplink pre-coding matrix, then k-th micro- base The down-bound pilot frequency signal that station receives is uplink pre-coding matrix, down physical channel matrix and descending leads The superposition of frequency signal, micro-base station cannot be by uplink pre-coding matrix, down physical channel by channel estimation Matrix distinguishes, therefore, it is impossible to obtain uplink pre-coding matrix.In the present embodiment, macro base station is according to The down physical channel matrix of k micro-base station, obtains the pre-cancellation power of the down channel of k-th micro-base station Value, then, pre-cancellation weights and uplink pre-coding matrix using the down channel of k-th micro-base station enter Row precoding.

In a kind of implementation, macro base station can calculate the descending letter of k-th micro-base station using below equation The pre-cancellation weights G in roadk

Gk=(H'k)H[H'k(H'k)H]-1, wherein, H 'kFor the down physical channel matrix of k-th micro-base station, GkEstablishment needs to meet following condition:The antenna amount of macro base station is not less than the antenna number of k-th micro-base station Amount.However, it will be understood that the pre-cancellation weights G of the down channel of k-th micro-base stationkConcrete Form is not limited to above-mentioned formula, can also calculate by other means.

Step 106, macro base station use the pre-cancellation weights of down channel of k-th micro-base station and k-th The uplink pre-coding matrix of micro-base station, carries out being sent to k-th micro- base after precoding to down-bound pilot frequency signal Stand.

Make the pre-cancellation weights of the down channel of k-th micro-base station and k-th micro-base station by precoding Down physical channel matrix balance out, only include in the down-bound pilot frequency signal that k-th micro-base station receives The uplink pre-coding matrix of k-th micro-base station.

Can be by the uplink pre-coding matrix W of k-th micro-base stationkWeight as the 1st grade, micro- by k-th The pre-cancellation weights G of the down channel of base stationkClassification weighting as the 2nd grade of weighting carries out precoding, grand Signal after the precoding of base station is expressed as GkWkS, s represent down-bound pilot frequency signal.Signal warp after precoding Cross the downlink channel transmission of k-th micro-base station, then the down-bound pilot frequency signal table that k-th micro-base station receives It is shown as yk=H 'kGkWkS+u, u represent the interference of down channel.By Gk=(H'k)H[H'k(H'k)H]-1Bring y intok Obtain:

Can by formula To obtainWherein,Represent the descending equivalent channel matrix of k-th micro-base station.Micro-base station exists After receiving down-bound pilot frequency signal, carry out channel and estimate with down-bound pilot frequency signal s according to after down-bound pilot frequency signal Meter obtainsAnd u, due toTherefore, k-th micro-base station direct estimation obtainsAs upper Row pre-coding matrix Wk, then, according to uplink pre-coding matrix WkCarry out up precoding.

In prior art, macro base station, after getting uplink pre-coding matrix, can carry out pre-coding matrix Quantify, obtain the corresponding code book of uplink pre-coding matrix, then, code book is sent to by micro- base by signaling Stand, the quantization of pre-coding matrix can introduce error, lead to the precision of pre-coding matrix low.And the present embodiment In, macro base station, after getting pre-coding matrix, does not carry out the quantization of pre-coding matrix, but root According to the uplink physical channel matrix of k-th micro-base station, determine the down physical channel square of k-th micro-base station Battle array, according to the down physical channel matrix of described k-th micro-base station, obtains the descending of k-th micro-base station The pre-cancellation weights of channel, finally, using the pre-cancellation weights and of the down channel of k-th micro-base station The uplink pre-coding matrix of k micro-base station, carries out to down-bound pilot frequency signal being sent to k-th after precoding Micro-base station, due to the pre-cancellation weights of the down channel by k-th micro-base station of precoding and k-th micro- The down physical channel matrix of base station balances out so that the down-bound pilot frequency signal that receives of k-th micro-base station In only include the uplink pre-coding matrix of k-th micro-base station such that it is able to send uplink pre-coding matrix To micro-base station.Because the uplink pre-coding matrix that macro base station sends is not through quantifying, therefore, micro- Base station can get high-precision uplink pre-coding matrix so that uplink pre-coding 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 micro-base station, N be more than Positive integer equal to 2.

The uplink pilot signal that step 202, macro base station send according to k-th micro-base station receiving, really The uplink physical channel matrix of fixed k-th micro-base 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 micro-base station, determine N number of micro- base The uplink pre-coding matrix stood.

Step 204, macro base station, according to the uplink physical channel matrix of k-th micro-base station, determine k-th The down physical channel matrix of micro-base station.

Step 205, macro base station, according to the down physical channel matrix of k-th micro-base station, obtain k-th The pre-cancellation weights of the down channel of micro-base station.

Step 206, macro base station use the pre-cancellation weights of down channel of k-th micro-base station and k-th The uplink pre-coding matrix of micro-base station, carries out being sent to k-th micro- base after precoding to down-bound pilot frequency signal Stand.

Make the pre-cancellation weights of the down channel of k-th micro-base station and k-th micro-base station by precoding Down physical channel matrix balance out, only include in the down-bound pilot frequency signal that k-th micro-base station receives The uplink pre-coding matrix of k-th micro-base station.

The specific implementation of step 201-206 can refer to the implementation of embodiment one step 101-106, Here repeat no more.

Step 207, macro base station receive the upward signal of k-th micro-base station transmission, and upward signal is kth Individual micro-base station is treated sending signal using the uplink pre-coding matrix of k-th micro-base station and is carried out after precoding Signal.

K-th micro-base station, after the down-bound 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 pre-coding matrix, then, K micro-base station using uplink pre-coding matrix to sent signal carry out passing through after precoding k-th micro- The up channel of base station is sent to macro base station, and macro base station receives the upward signal of k-th micro-base station transmission. The upward signal that k-th micro-base station that macro base station receives sends can be expressed as:

y′k=HkWkS '+u, wherein, HkRepresent the uplink physical channel matrix of k-th micro-base station, WkTable Show the uplink pre-coding matrix of k-th micro-base station, s ' represents signal to be sent, u represents k-th micro-base station Up channel interference.

Step 208, macro base station are according to the uplink physical channel matrix of k-th micro-base station and k-th micro- base The uplink pre-coding matrix stood, generates the up equivalent channel matrix of k-th micro-base station.

The up equivalent channel matrix of k-th micro-base station is expressed as:

Step 209, macro base station obtain according to the up equivalent channel matrix of k-th micro-base station and upward signal To signal to be sent.

Macro base station is according to y 'k=HkWkS '+u andCarry out data demodulation and obtain signal s ' to be sent.

In the present embodiment, macro base station receives the upward signal that k-th micro-base station sends, and upward signal is the K micro-base station carries out the signal after precoding using the uplink pre-coding matrix of k-th micro-base station, according to The uplink physical channel matrix of k-th micro-base station and the uplink pre-coding matrix of k-th micro-base station, generate The up equivalent channel matrix of k-th micro-base station, and the up equivalent channel square according to k-th micro-base station Upward signal is demodulated battle array such that it is able to the upward signal that sends of unsuccessful demodulation micro-base station.Due to upper Row signal is that micro-base station carries out the signal after precoding using the uplink pre-coding matrix that macro base station sends, because This is so that uplink pre-coding 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 pre-coding matrix mentioned above can introduce Error, leads to the low problem of the precision of pre-coding matrix, also has one disadvantage in that:Available precoding codebook Number typically limited so that multiuser MIMO cannot effective cooperation, there is multi-user interference problem.Especially It is that inter-user interference is even more serious in multi-user high order MIMO.Dry between multi-user in order to solve Disturb problem, on the basis of above-described embodiment one and embodiment two, provide a kind of in the embodiment of the present invention three The computational methods of uplink pre-coding matrix, can disturb between uplink multi-users and make effective pretreatment and association Make, lift uplink multi-users 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 pre-coding 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 k-th micro-base station prelist During code matrix, macro base station is according to the uplink physical channel square of other micro-base stations in addition to k-th micro-base station Battle array, and uplink pre-coding matrix in the i-th -1 time iterative process for other micro-base stations, determine k-th 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 pre-coding matrix of each micro-base station is unit matrix.

In a kind of implementation, macro base station is according to the uplink physical channel matrix of other micro-base stations, other are micro- Uplink pre-coding matrix in the i-th -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 k-th micro-base 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 k-th micro-base station is subject to.

Wherein, the interference matrix of the interference that k-th micro-base station is subject to can be calculated by equation below:J=1,2 ... ..., N, and j ≠ k, HjRepresent j-th micro-base station Uplink physical channel matrix,Represent that up in the i-th -1 time iterative process of j-th micro-base station prelists Code matrix, I represents the statistics covariance matrix of uplink interference.

Interference matrix can be expressed as after carrying out Eigenvalues DecompositionWherein, UkFor The interference radiating way of the interference that k-th micro-base station is subject to, DkThe disturbing of the interference being subject to for k-th micro-base station Intensity.

So that N is equal to 2 as a example, that is, have two micro-base stations, then in first time iterative process, macro base station The signal receiving isIn expression first time iterative process, the 1st micro-base station is upper Row physical channel matrix,Represent the uplink physical channel square of the 1st micro-base station in first time iterative process Battle array, u represents the uplink interference of the 1st micro-base station.Macro base station is by each layer and maximum capacity or approximate Criterion is made conventional SU-MIMO 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 precodingL, thenDimension beRepresent the antenna amount of the 1st micro-base station.

ObtainingAfterwards, macro base station obtains according to above-mentioned formulaThen to R1 Carry out Eigenvalues Decomposition:EVD(R1)=U1D1U1 H, wherein, U1Represent that the 1st micro-base station is subject to dry Disturb direction, D1Represent the 1st interference strength that micro-base station is subject to.

The interference strength of the interference that step 302, macro base station are subject to according to k-th micro-base station and interference radiating way Determine the interference weights of the interference that k-th micro-base station is subject to.

Interference weights specifically can calculate in the following manner:UkIt is subject to for k-th micro-base station The interference radiating way of the interference arrived, DkThe interference strength of the interference being subject to for k-th micro-base station.

The interference weights of the interference that k-th micro-base station is subject to by step 303, macro base station are applied to k-th On the up channel of micro-base station, obtain the up equivalent channel matrix of k-th micro-base station.

The up equivalent channel matrix of k-th micro-base station can be calculated by equation below:Hk The channel matrix of the up channel of k-th micro-base station, GkRepresent the dry of the interference that k-th micro-base station is subject to Disturb weights.

Step 304, macro base station, according to the up equivalent channel matrix of k-th micro-base station, determine k-th Uplink pre-coding matrix during ith iteration for the micro-base station.

K-th micro-base station uplink pre-coding matrix during ith iteration can be expressed as:Represent withAs channel matrix and additive noise covariance For the single user pre-coding 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 micro-base station Battle array, and the uplink physical channel matrix of n-th micro-base 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 i-th -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 pre-coding matrix during ith iteration as N number of micro-base station Uplink pre-coding matrix.

Step 308, i plus one, carry out next iteration.

In the present embodiment, the signal that certain micro-base station is alternately sent by macro base station, will used as echo signal The signal that other micro-base stations send as interference, determines the up of each micro-base station in the case of multi-user interference Pre-coding matrix makees effective pretreatment and cooperation, in lifting such that it is able to disturb between uplink multi-users Row multiple-user 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, micro-base station send uplink pilot signal to macro base station.

The uplink pilot signal that micro-base station sends is not through precoding.

Step 402, micro-base station receive the down-bound pilot frequency signal that macro base station sends, and down-bound pilot frequency signal is grand Base station is according to the pre-cancellation weights of down channel and the uplink pre-coding matrix of micro-base station to down-bound pilot frequency signal Carry out the signal after precoding, by pre-cancellation weights and the micro-base station of the down channel of precoding micro-base station Down physical channel matrix balance out, only include the up precoding square of micro-base station in down-bound pilot frequency signal Battle array.

Step 403, micro-base station carry out channel according to the down-bound pilot frequency signal receiving and down-bound pilot frequency signal Estimate to obtain descending equivalent channel matrix, determine the up precoding that descending equivalent channel matrix is micro-base station Matrix.

Step 404, micro-base station carry out sending out after precoding to sent signal using uplink pre-coding 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, micro-base station receives the down-bound pilot frequency signal that macro base station sends, according to receiving down Row pilot signal and down-bound pilot frequency signal carry out channel estimation and obtain descending equivalent channel matrix, determine descending Equivalent channel matrix be micro-base station uplink pre-coding matrix, using uplink pre-coding matrix to sent Signal is sent to macro base station after carrying out precoding.Because upward signal is that micro-base station uses macro base station to send Uplink pre-coding matrix carries out the signal after precoding, therefore so that uplink pre-coding 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 micro-base 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 k-th micro-base station receiving, Determine the uplink physical channel matrix of described k-th micro-base 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 micro-base station, determines The uplink pre-coding matrix of described N number of micro-base station;

Described first determining module 22, is additionally operable to the uplink physical channel square according to described k-th micro-base station Battle array, determines the down physical channel matrix of described k-th micro-base station;

3rd determining module 24, for the down physical channel matrix according to described k-th micro-base station, obtains Pre-cancellation weights to the down channel of described k-th micro-base station;

Sending module 25, the pre-cancellation weights for the down channel using described k-th micro-base station and institute State the uplink pre-coding matrix of k-th micro-base station, down-bound pilot frequency signal is carried out be sent to after precoding with institute State k-th micro-base station, make the pre-cancellation power of the down channel of described k-th micro-base station by precoding The down physical channel matrix of value and described k-th micro-base station balances out, and described k-th micro-base station receives To down-bound pilot frequency signal in only include the uplink pre-coding matrix of described k-th micro-base station.

Optionally, described 3rd determining module 24 specifically for:

Calculate the pre-cancellation weights G of the down channel of described k-th micro-base station using below equationk

Gk=(H'k)H[H'k(H'k)H]-1, wherein, H 'kDown physical channel square for described k-th micro-base station Battle array.

Optionally, described first determining module specifically for:Ascending according to described k-th micro-base station Reason channel matrix, and the up channel of described k-th micro-base station and the heterogeneite of down channel, obtain The down physical channel matrix of described k-th micro-base 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 k-th micro-base station sends, described Upward signal is that described k-th micro-base station is carried out using the uplink pre-coding matrix of described k-th micro-base station Signal after precoding;

Described generation module 26, for the uplink physical channel matrix according to described k-th micro-base station and institute State the uplink pre-coding matrix of k-th micro-base station, generate the up equivalent channel of described k-th micro-base station Matrix;

Described acquisition module 27, for according to the up equivalent channel matrix of described k-th micro-base station to institute State upward signal to be demodulated.

Optionally, described generation module 26 specifically for:

Generate the up equivalent channel matrix of described k-th micro-base station according to equation below:

Wherein, HkFor the uplink physical channel matrix of described k-th micro-base station, WkFor institute State the uplink pre-coding matrix of k-th micro-base 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 pre-coding matrix of described k-th micro-base station, According to the uplink physical channel matrix of other micro-base stations in addition to described k-th micro-base station and described Uplink pre-coding matrix in the i-th -1 time iterative process for other micro-base stations, determines described k-th micro-base 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 pre-coding matrix of each micro-base station is unit matrix;

The interference strength of the interference being subject to according to described k-th micro-base station and interference radiating way determine described kth The interference weights of the interference that individual micro-base station is subject to;

The interference weights of the interference that described k-th micro-base station is subject to are applied to described k-th micro-base station On up channel, obtain the up equivalent channel matrix of described k-th micro-base station;

According to the up equivalent channel matrix of described k-th micro-base station, determine that described k-th micro-base station exists Uplink pre-coding matrix during ith iteration;

According to uplink pre-coding matrix during ith iteration for the described N number of micro-base station and described The uplink physical channel matrix of n-th micro-base 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 pre-coding matrix during ith iteration is made respectively Uplink pre-coding matrix for described N number of micro-base 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 k-th micro-base station of determination and interference radiating way, Described second determining module specifically for:Uplink physical channel matrix, institute according to other micro-base stations described State the statistics of uplink pre-coding matrix in the i-th -1 time iterative process for other micro-base stations and uplink interference Covariance matrix, determines the interference matrix that other micro-base 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 k-th micro-base 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 micro-base station that Fig. 8 provides for the embodiment of the present invention eight, as shown in figure 8, this reality The micro-base 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 down-bound pilot frequency signal that described macro base station sends, described descending pilot frequency Signal is the up precoding square of the pre-cancellation weights according to down channel for the described macro base station and described micro-base station Battle array carries out the signal after precoding to down-bound pilot frequency signal, by the down channel of micro-base station described in precoding Pre-cancellation weights and the down physical channel matrix of described micro-base station balance out, described down-bound pilot frequency signal In only include the uplink pre-coding matrix of described micro-base station;

Determining module 33, for carrying out according to the down-bound pilot frequency signal receiving and described down-bound pilot frequency signal Channel estimation obtains described descending equivalent channel matrix, determines that described descending equivalent channel matrix is described micro- The uplink pre-coding matrix of base station;

Described sending module 31, is also used for described uplink pre-coding matrix and carries out to sent signal It is sent to described macro base station after precoding.

The present embodiment provide micro-base 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 micro-base 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 k-th micro-base station according to receiving sends, Determine the uplink physical channel matrix of described k-th micro-base station, the value of k is 1,2 ... ..., N;

According to the uplink physical channel matrix of described N number of micro-base station, determine the up of described N number of micro-base station Pre-coding matrix;

According to the uplink physical channel matrix of described k-th micro-base station, determine described k-th micro-base station Down physical channel matrix;

According to the down physical channel matrix of described k-th micro-base station, obtain described k-th micro-base station The pre-cancellation weights of down channel.

Described emitter 41 is used for pre-cancellation weights and the institute of the down channel using described k-th micro-base station State the uplink pre-coding matrix of k-th micro-base station, down-bound pilot frequency signal is carried out be sent to after precoding with institute State k-th micro-base station, make the pre-cancellation power of the down channel of described k-th micro-base station by precoding The down physical channel matrix of value and described k-th micro-base station balances out, and described k-th micro-base station receives To down-bound pilot frequency signal in only include the uplink pre-coding matrix of described k-th micro-base station.

Described receptor 42 is additionally operable to receive the upward signal that described k-th micro-base station sends, described up Signal is that described k-th micro-base station uses the uplink pre-coding matrix of described k-th micro-base 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 k-th micro-base station and institute State the uplink pre-coding matrix of k-th micro-base station, generate the up equivalent channel of described k-th micro-base station Matrix;Described in up equivalent channel matrix according to described k-th micro-base station and described upward signal obtain Signal to be sent.

Optionally, described processor 43, according to the down physical channel matrix of described k-th micro-base station, obtains To the pre-cancellation weights of the down channel of described k-th micro-base station, specially:

Calculate the pre-cancellation weights G of the down channel of described k-th micro-base station using below equationk

Gk=(H'k)H[H'k(H'k)H]-1, wherein, H 'kDown physical channel square for described k-th micro-base station Battle array.

Optionally, described processor 43 is according to the uplink physical channel matrix of described k-th micro-base station, really The down physical channel matrix of fixed described k-th micro-base station, specially:

According to the uplink physical channel matrix of described k-th micro-base station, and described k-th micro-base station Up channel and the heterogeneite of down channel, obtain the down physical channel matrix of described k-th micro-base station.

Optionally, described processor 43 is according to the uplink physical channel matrix of described k-th micro-base station and institute State the uplink pre-coding matrix of k-th micro-base station, generate the up equivalent channel of described k-th micro-base station Matrix, specially:

Generate the up equivalent channel matrix of described k-th micro-base station according to equation below:

Wherein, HkFor the uplink physical channel matrix of described k-th micro-base station, WkFor institute State the uplink pre-coding matrix of k-th micro-base station.

Optionally, described processor 43 is according to the uplink physical channel matrix of described N number of micro-base station, really The uplink pre-coding matrix of fixed described N number of micro-base station, specially:

During ith iteration, when determining the uplink pre-coding matrix of described k-th micro-base station, Described macro base station is according to the uplink physical channel square of other micro-base stations in addition to described k-th micro-base station Battle array, and uplink pre-coding matrix in the i-th -1 time iterative process for other micro-base stations described, determine described The interference strength of interference and interference radiating way that k-th micro-base station is subject to, wherein, the initial value of k is 1, i Initial value be also 1, the initial value of the uplink pre-coding matrix of each micro-base station is unit matrix;

The interference strength of the interference being subject to according to described k-th micro-base station and interference radiating way determine described kth The interference weights of the interference that individual micro-base station is subject to;

The interference weights of the interference that described k-th micro-base station is subject to are applied to described k-th micro-base station On up channel, obtain the up equivalent channel matrix of described k-th micro-base station;

According to the up equivalent channel matrix of described k-th micro-base station, determine that described k-th micro-base station exists Uplink pre-coding matrix during ith iteration;

According to uplink pre-coding matrix during ith iteration for the described N number of micro-base station and described The uplink physical channel matrix of n-th micro-base 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 pre-coding matrix during ith iteration is made respectively Uplink pre-coding matrix for described N number of micro-base 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 micro-base stations in addition to described k-th micro-base station Row physical channel matrix, and up precoding square in the i-th -1 time iterative process for other micro-base stations described Battle array, determines the interference strength of interference and interference radiating way that described k-th micro-base station be subject to, specially:

Changed at the i-th -1 time according to the uplink physical channel matrix of other micro-base stations described, other micro-base stations described Uplink pre-coding matrix during generation and the statistics covariance matrix of uplink interference, determine described kth The interference matrix of the interference that individual micro-base 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 k-th micro-base 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 micro-base station that Figure 10 provides for the embodiment of the present invention ten, as shown in Figure 10, this The micro-base 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 down-bound pilot frequency signal that described macro base station sends, described descending pilot frequency Signal is the up precoding square of the pre-cancellation weights according to down channel for the described macro base station and described micro-base station Battle array carries out the signal after precoding to down-bound pilot frequency signal, by the down channel of micro-base station described in precoding Pre-cancellation weights and the down physical channel matrix of described micro-base station balance out, described down-bound pilot frequency signal In only include the uplink pre-coding matrix of described micro-base station;

Described processor 53 is used for being entered according to the down-bound pilot frequency signal receiving and described down-bound pilot frequency signal Row channel estimation obtains described descending equivalent channel matrix, determines that described descending equivalent channel matrix is described The uplink pre-coding matrix of micro-base station;

Described emitter 51 be also used for described uplink pre-coding matrix carry out to sent signal pre- It is sent to described macro base station after coding.

The micro-base 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 above-mentioned 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 above-mentioned 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.

Claims (16)

1. a kind of wireless communications method is it is characterised in that include:
Macro base station receives the uplink pilot signal that N number of micro-base 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 k-th micro-base station receiving, determines described The uplink physical channel matrix of k-th micro-base 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 micro-base station, determines described N number of micro- The uplink pre-coding matrix of base station;
Described macro base station, according to the uplink physical channel matrix of described k-th micro-base station, determines described kth The down physical channel matrix of individual micro-base station;
Described macro base station, according to the down physical channel matrix of described k-th micro-base station, obtains described kth The pre-cancellation weights of the down channel of individual micro-base station;
Described macro base station uses the pre-cancellation weights of down channel of described k-th micro-base station and described kth The uplink pre-coding matrix of individual micro-base station, carries out being sent to described kth after precoding to down-bound pilot frequency signal Individual micro-base station, makes pre-cancellation weights and the institute of the down channel of described k-th micro-base station by precoding The down physical channel matrix stating k-th micro-base station balances out, and described k-th micro-base station receives down The uplink pre-coding matrix of described k-th micro-base station is only included in row pilot signal.
2. method according to claim 1 is it is characterised in that methods described also includes:
Described macro base station receives the upward signal that described k-th micro-base station sends, and described upward signal is institute State k-th micro-base station and treat sending signal using the uplink pre-coding matrix of described k-th micro-base station and carry out Signal after precoding;
Described macro base station according to the uplink physical channel matrix of described k-th micro-base station and described k-th micro- The uplink pre-coding matrix of base station, generates the up equivalent channel matrix of described k-th micro-base station;
Described macro base station is according to the up equivalent channel matrix of described k-th micro-base station and described upward signal Obtain described signal to be sent.
3. method according to claim 1 and 2 is it is characterised in that described macro base station is according to described The down physical channel matrix of k-th micro-base station, obtain described k-th micro-base station down channel pre- Offset weights, including:
Described macro base station uses below equation to calculate the pre-cancellation power of the down channel of described k-th micro-base station Value Gk
Wherein, H 'kDown physical channel square for described k-th micro-base station Battle array.
4. method according to claim 1 and 2 is it is characterised in that described macro base station is according to described The uplink physical channel matrix of k-th micro-base station, determines the down physical channel of described k-th micro-base station Matrix, including:
Described macro base station is according to the uplink physical channel matrix of described k-th micro-base station, and described kth The up channel of individual micro-base station and the heterogeneite of down channel, obtain the descending thing of described k-th micro-base station Reason channel matrix.
5. method according to claim 2 is it is characterised in that described macro base station is according to described kth The uplink physical channel matrix of individual micro-base station and the uplink pre-coding matrix of described k-th micro-base station, generate The up equivalent channel matrix of described k-th micro-base station, including:
Described macro base station generates the up equivalent channel matrix of described k-th micro-base station according to equation below:
Wherein, HkFor the uplink physical channel matrix of described k-th micro-base station, WkFor institute State the uplink pre-coding matrix of k-th micro-base station.
6. method according to claim 1 and 2 is it is characterised in that described macro base station is according to described The uplink physical channel matrix of N number of micro-base station, determines the uplink pre-coding matrix of described N number of micro-base station, Including:
During ith iteration, described macro base station prelists in determination the up of described k-th micro-base station During code matrix, described macro base station is according to the ascending of other micro-base stations in addition to described k-th micro-base station Reason channel matrix, and uplink pre-coding matrix in the i-th -1 time iterative process for other micro-base stations described, Determine the interference strength of interference and interference radiating way that described k-th micro-base 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 pre-coding matrix of each micro-base station is unit square Battle array;
The interference strength of the interference that described macro base station is subject to according to described k-th micro-base station and interference radiating way are true The interference weights of the interference that fixed described k-th micro-base station is subject to;
The interference weights of the interference that described k-th micro-base station is subject to by described macro base station are applied to described kth On the up channel of individual micro-base station, obtain the up equivalent channel matrix of described k-th micro-base station;
Described macro base station, according to the up equivalent channel matrix of described k-th micro-base station, determines described kth Uplink pre-coding matrix during ith iteration for the individual micro-base station;
Described macro base station uplink pre-coding matrix during ith iteration according to described N number of micro-base station, And the uplink physical channel matrix of described n-th micro-base 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 pre-coding matrix during ith iteration is made respectively Uplink pre-coding matrix for described N number of micro-base station;
If it is determined that not terminating iterative process, then i plus one, carrying out next iteration.
7. method according to claim 6 is it is characterised in that described macro base station is according to except described The uplink physical channel matrix of other micro-base stations outside k micro-base station, and other micro-base stations described exist Uplink pre-coding matrix in the i-th -1 time iterative process, determines the interference that described k-th micro-base station is subject to Interference strength and interference radiating way, including:
Described macro base station is according to the uplink physical channel matrix of other micro-base stations described, other micro-base stations described The statistics covariance matrix of the uplink pre-coding matrix in the i-th -1 time iterative process and uplink interference, really The interference matrix of the interference that fixed described k-th micro-base station is subject to;
Described macro base station carries out Eigenvalues Decomposition to described interference matrix, obtains described k-th micro-base station and is subject to The interference strength of the interference arrived and interference radiating way.
8. a kind of wireless communications method is it is characterised in that include:
Micro-base station sends uplink pilot signal to macro base station;
Described micro-base station receives the down-bound pilot frequency signal that described macro base station sends, and described down-bound pilot frequency signal is Described macro base station according to the pre-cancellation weights of down channel and the uplink pre-coding matrix of described micro-base station under Row pilot signal carries out the signal after precoding, is supported by the pre- of down channel of micro-base station described in precoding The down physical channel matrix of weights and the described micro-base station of disappearing balances out, and only wraps in described down-bound pilot frequency signal Include the uplink pre-coding matrix of described micro-base station;
Described micro-base station carries out channel according to the down-bound pilot frequency signal receiving and described down-bound pilot frequency signal and estimates Meter obtains described descending equivalent channel matrix, determines that described descending equivalent channel matrix is described micro-base station Uplink pre-coding matrix;
Described micro-base station carries out sending after precoding to sent signal using described uplink pre-coding matrix To described macro base station.
9. a kind of macro base station is it is characterised in that include:
Receiver module, for receiving the uplink pilot signal that N number of micro-base station sends respectively, N be more than etc. In 2 positive integer;
First determining module, for the uplink pilot signal being sent according to k-th micro-base station receiving, Determine the uplink physical channel matrix of described k-th micro-base station, the value of k is 1,2 ... ..., N;
Second determining module, for the uplink physical channel matrix according to described N number of micro-base station, determines institute State the uplink pre-coding matrix of N number of micro-base station;
Described first determining module, is additionally operable to the uplink physical channel matrix according to described k-th micro-base station, Determine the down physical channel matrix of described k-th micro-base station;
3rd determining module, for the down physical channel matrix according to described k-th micro-base station, obtains The pre-cancellation weights of the down channel of described k-th micro-base station;
Sending module, pre-cancellation weights for the down channel using described k-th micro-base station and described The uplink pre-coding matrix of k-th micro-base station, carries out being sent to after precoding described to down-bound pilot frequency signal K-th micro-base station, makes the pre-cancellation weights of the down channel of described k-th micro-base station by precoding Balance out with the down physical channel matrix of described k-th micro-base station, described k-th micro-base station receives Down-bound pilot frequency signal in only include the uplink pre-coding matrix of described k-th micro-base station.
10. macro base station according to claim 9 is it is characterised in that also include:Generation module and Acquisition module;
Described receiver module, is additionally operable to receive the upward signal that described k-th micro-base station sends, described on It is pre- that row signal is that described k-th micro-base station is carried out using the uplink pre-coding matrix of described k-th micro-base station Signal after coding;
Described generation module, for the uplink physical channel matrix according to described k-th micro-base station and described The uplink pre-coding matrix of k-th micro-base station, generates the up equivalent channel square of described k-th micro-base station Battle array;
Described acquisition module, for according to the up equivalent channel matrix of described k-th micro-base station to described Upward signal is demodulated.
11. macro base stations according to claim 9 or 10 are it is characterised in that the described 3rd determines mould Block specifically for:
Calculate the pre-cancellation weights Gk of the down channel of described k-th micro-base station using below equation:
Wherein, H 'kDown physical channel square for described k-th micro-base station Battle array.
12. macro base stations according to claim 9 or 10 are it is characterised in that described first determines mould Block specifically for:
According to the uplink physical channel matrix of described k-th micro-base station, and described k-th micro-base station Up channel and the heterogeneite of down channel, obtain the down physical channel matrix of described k-th micro-base station.
13. macro base stations according to claim 10 are it is characterised in that described generation module is specifically used In:
Generate the up equivalent channel matrix of described k-th micro-base station according to equation below:
Wherein, HkFor the uplink physical channel matrix of described k-th micro-base station, WkFor institute State the uplink pre-coding matrix of k-th micro-base station.
14. macro base stations according to claim 9 or 10 are it is characterised in that described second determines mould Block specifically for:
During ith iteration, when determining the uplink pre-coding matrix of described k-th micro-base station, According to the uplink physical channel matrix of other micro-base stations in addition to described k-th micro-base station and described Uplink pre-coding matrix in the i-th -1 time iterative process for other micro-base stations, determines described k-th micro-base 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 pre-coding matrix of each micro-base station is unit matrix;
The interference strength of the interference being subject to according to described k-th micro-base station and interference radiating way determine described kth The interference weights of the interference that individual micro-base station is subject to;
The interference weights of the interference that described k-th micro-base station is subject to are applied to described k-th micro-base station On up channel, obtain the up equivalent channel matrix of described k-th micro-base station;
According to the up equivalent channel matrix of described k-th micro-base station, determine that described k-th micro-base station exists Uplink pre-coding matrix during ith iteration;
According to uplink pre-coding matrix during ith iteration for the described N number of micro-base station and described The uplink physical channel matrix of n-th micro-base 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 pre-coding matrix during ith iteration is made respectively Uplink pre-coding matrix for described N number of micro-base station;
If it is determined that not terminating iterative process, then i plus one, carrying out next iteration.
15. macro base stations according to claim 14 are it is characterised in that described second determining module has Body is used for:
Changed at the i-th -1 time according to the uplink physical channel matrix of other micro-base stations described, other micro-base stations described Uplink pre-coding matrix during generation and the statistics covariance matrix of uplink interference, determine described other The interference matrix that micro-base station produces;
Eigenvalues Decomposition is carried out to described interference matrix, obtains the interference that described k-th micro-base station is subject to Interference strength and interference radiating way.
A kind of 16. micro-base stations are it is characterised in that include:
Sending module, for sending uplink pilot signal to macro base station;
Receiver module, for receiving the down-bound pilot frequency signal that described macro base station sends, described descending pilot frequency letter Number it is the uplink pre-coding matrix of the pre-cancellation weights according to down channel for the described macro base station and described micro-base station Signal after precoding is carried out to down-bound pilot frequency signal, by the down channel of micro-base station described in precoding The down physical channel matrix of pre-cancellation weights and described micro-base station balances out, in described down-bound pilot frequency signal Only include the uplink pre-coding matrix of described micro-base station;
Determining module, for carrying out letter according to the down-bound pilot frequency signal receiving and described down-bound 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 pre-coding matrix stood;
Described sending module, be also used for described uplink pre-coding matrix carry out to sent signal pre- It is sent to described macro base station after coding.
CN201510466747.0A 2015-07-31 2015-07-31 Wireless communication method, macro base station and micro base station CN106411372B (en)

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