CN108494446A - The interference elimination method of multiple-input and multiple-output down isomeric network - Google Patents
The interference elimination method of multiple-input and multiple-output down isomeric network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity 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
- H04B7/0615—Diversity 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
- H04B7/0617—Diversity 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 for beam forming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
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Abstract
The invention discloses a kind of interference elimination method of multiple-input and multiple-output down isomeric network, implementation step is：(1) systematic parameter is set；(2) judge whether macro total number of users is even number；(3) first order launching beam forming matrix of the first order launching beam forming matrix and second micro-base station of first micro-base station is built respectively；(4) second level launching beam forming matrix of the second level launching beam forming matrix and second micro-base station of first micro-base station is built respectively；(5) the reception beamforming matrix of the reception beamforming matrix and second group of macro user of first group of macro user is built respectively；(6) the reception beamforming matrix of the reception beamforming matrix and second micro- user of first micro- user is built respectively；(7) the launching beam forming matrix of macro base station is built；(8) interference in down isomeric network is eliminated.
Description
Technical field
The invention belongs to field of communication technology, how defeated a kind of multi input further related in wireless communication technology field is
Go out the interference elimination method of MIMO (multiple input multiple output) down isomeric network.The present invention can be used for
The multiple-input and multiple-output from base station to user being made of a macro base station, multiple macro users, two micro-base stations, two micro- users
Down isomeric network, the multi-user interference from macro base station and the interlayer from other micro-base stations for eliminating macro user's reception are dry
It disturbs, while eliminating the interlayer interference from macro base station and the same layer interference from other micro-base stations that micro- user receives, wherein often
A micro-base station services a micro- user, and macro base station services multiple macro users.
Background technology
In recent years, with the development of wireless communication technique, wireless network experienced swift and violent development, transmission rate and frequency spectrum
Efficiency is greatly paid close attention to.Multiple-input and multiple-output MIMO technology can be fast using transmission is improved the characteristics of the multiple antennas of sending and receiving end
Rate, while the deployment of heterogeneous network, can effectively improve the spectrum efficiency of mobile radio network.
Paper " W Liu, JX Sun, J Li, the Y Ma.Interference Alignment that W.Liu et al. is delivered at it
for MIMO Downlink Multicell Networks.IEEE Transactions on Vehicular
Technology,65(8):A kind of interference alignment for MIMO multi-cell downlink networks is proposed in 6159-6167,2016 "
Method.The precondition of this method is each base station as the antenna of each user sum.The implementation steps of this method：First
Step, by user grouping and base station association；Second step, the reception beamforming matrix of designing user；Third walks, and designs the hair of base station
Penetrate beamforming matrix.Shortcoming existing for this method is, due to the limitation of this method precondition, so not being suitable for base
The different situation of antenna sum of the antenna sum and user stood.
Xian Electronics Science and Technology University its application patent document " macrocell multi-user MIMO system down isomeric network
Disturbance restraining method " (application number：201410211273.0 the applying date：2014.05.16 application publication number：CN103973352A)
In disclose a kind of disturbance restraining method of macrocell multiuser MIMO heterogeneous network downlink.This method mainly solves existing
The interference problem of macrocell multiuser MIMO heterogeneous network.The implementation steps of this method：The first step judges the strange of macro total number of users
Idol：Second step is grouped macrocell service user for the odd even situation of macro total number of users；Third walks, for even number
In the case of, the macro user of each two is divided into one group；4th step, in the case of odd number, the macro user of each two is divided into one group, last
A macro user is not involved in grouping；5th step, design macrocell, the launching beam forming matrix of Microcell and macro user, micro- user
Reception beamforming matrix.Shortcoming existing for this method is that macro user grouping number is more, while when macro total number of users is
When odd number, the last one user of macrocell is not involved in grouping, needs individually designed reception beamforming matrix, increases design
Complexity.
Invention content
It is an object of the invention to the deficiencies for above-mentioned prior art, it is proposed that a kind of multiple-input and multiple-output down isomeric
The interference elimination method of network.
It realizes that the concrete thought of the object of the invention is interfered for existing for multiple-input and multiple-output down isomeric network, leads to
Cross the transmitting of the reception beamforming matrix, micro-base station of the two-stage launching beam forming matrix, macro user for separately designing micro-base station
The launching beam forming matrix of beamforming matrix, macro base station achievees the purpose that interference is eliminated.
The heterogeneous network of the present invention includes a macro base station, multiple macro users, two micro-base stations, two micro- users, macro base
The multiple macro users of the service of standing, each micro-base station service a micro- user.The present invention is used to eliminate that macro user to receive comes from macro base
The multi-user interference stood and the interlayer interference from all micro-base stations, while eliminating the interlayer from macro base station that micro- user receives
Interference and same layer interference from other micro-base stations, specifically include that steps are as follows：
(1) systematic parameter is set：
M is arranged in macro base stationtN is arranged in root antenna, micro-base stationtRoot antenna, macro user and micro- user setting NrRoot antenna, often
A micro-base station emits d data flow to the micro- user of target, and macro base station emits a data flows of d ', M to each macro usert、Nt、Nr、d、
The value of d ' is the natural number more than or equal to 1；
(2) judge whether macro total number of users is even number, if so, thening follow the steps (3)；Otherwise, step (8) is executed；
(3) first order of the first order launching beam forming matrix and second micro-base station of first micro-base station is built respectively
Launching beam forming matrix：
The half that (3a) arbitrarily chooses macro total number of users forms first group, and remaining macro user forms second group；
(3b) utilizes transposed matrix formula, builds the first order launching beam forming matrix and the of first micro-base station respectively
The first order launching beam forming matrix of two micro-base stations；
(4) structural matrix formula is utilized, builds the second level launching beam forming matrix and the of first micro-base station respectively
The second level launching beam forming matrix of two micro-base stations；
(5) using being turned into subspace matrices formula, the reception beamforming matrix and the of first group of macro user is built respectively
The reception beamforming matrix of two groups of macro users；
(6) utilize null space matrix formula, build respectively first micro- user reception beamforming matrix and second
The reception beamforming matrix of micro- user；
(7) the kernel formula for utilizing multiplication matrix, builds the launching beam forming matrix of macro base station；
(8) first order of the first order launching beam forming matrix and second micro-base station of first micro-base station is built respectively
Launching beam forming matrix：
(8a) arbitrarily chooses a macro user, by the half of remaining macro total number of users and the macro user composition the arbitrarily chosen
One group, the other half of remaining macro total number of users forms second group with the macro user arbitrarily chosen；
(8b) utilizes transposed matrix formula, builds the first order launching beam forming matrix and the of first micro-base station respectively
The first order launching beam forming matrix of two micro-base stations；
(9) structural matrix formula is utilized, builds the second level launching beam forming matrix and the of first micro-base station respectively
The second level launching beam forming matrix of two micro-base stations；
(10) using being turned into subspace matrices formula, the reception beamforming matrix and the of first group of macro user is built respectively
The reception beamforming matrix of two groups of macro users；
(11) utilize null space matrix formula, build respectively first micro- user reception beamforming matrix and second
The reception beamforming matrix of micro- user；
(12) the kernel formula for utilizing multiplication matrix, builds the launching beam forming matrix of macro base station；
(13) interference in down isomeric network is eliminated：
(13a) eliminates formula using multi-user interference, eliminates the multi-user interference from macro base station that macro user receives；
(13b) eliminates formula using micro-base station interlayer interference, eliminates the interlayer from all micro-base stations that macro user receives
Interference；
(13c) eliminates formula using the interference of micro-base station same layer, eliminates the same layer from other micro-base stations that micro- user receives
Interference；
(13d) eliminates formula using macro base station interlayer interference, eliminates the interlayer interference from macro base station that micro- user receives.
Compared with prior art, the invention has the advantages that：
First, the present invention for macro base station, micro-base station, the different situations of user, respectively construct macro base station, micro-base station hair
The reception beam forming matrix for penetrating beamforming matrix and macro user, micro- user overcome base station in the prior art and user day
Disadvantage as line sum so that the present invention is suitable for micro-base station and the different situation of user antenna sum.
Second, the present invention due to being constructed using the method for macro user grouping construction by the way that macro user is divided into two groups respectively
The reception beam forming matrix of macro base station, the launching beam forming matrix of micro-base station and macro user, micro- user, overcome existing skill
Macro user grouping number is more in art, when macro total number of users is odd number, needs the received wave of the last one individually designed macro user
The shortcomings that beam shaping matrix so that present invention decreases the complexity of design.
Description of the drawings
Fig. 1 is the flow chart of the present invention；
Fig. 2 is the analogous diagram of the present invention.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings.
With reference to attached drawing 1, the specific implementation of the present invention is described in further detail.
Step 1, systematic parameter is set.
M is arranged in macro base stationtN is arranged in root antenna, micro-base stationtRoot antenna, macro user and micro- user setting NrRoot antenna, often
A micro-base station emits d data flow to the micro- user of target, and macro base station emits a data flows of d ', M to each macro usert、Nt、Nr、d、
The value of d ' is the natural number more than or equal to 1.
Step 2, judge whether macro total number of users is even number, if so, thening follow the steps 3；Otherwise, step 8 is executed.
Step 3, build respectively first micro-base station first order launching beam forming matrix and second micro-base station the
Level-one launching beam forming matrix.
When macro total number of users is even number K, macro user is divided into two groups, macro user [p, 3] is denoted as first group,Macro user [l, 3] is denoted as second group,
According to the following formula, the first order launching beam forming matrix and second micro-base station of first micro-base station are built respectively
First order launching beam forming matrix：
Wherein,Indicate the first order of first micro-base stationTie up launching beam forming matrix, NtRepresenting matrix
Line number, value be equal to micro-base station antenna sum,Representing matrixColumns, value is equal toNrIndicate every
The antenna of a macro user and micro- user sum,Expression belongs to symbol, and null expressions take kernel to operate, and H indicates transposition behaviour
Make,Indicate first micro-base station to theThe channel matrix of a macro user,Indicate that first micro-base station arrives
The channel matrix of the macro user of k-th,Indicate the first order of second micro-base stationLaunching beam forming matrix is tieed up,Indicate second micro-base station to first macro user channel matrix,Indicate second micro-base station to theA macro use
The channel matrix at family, in order to ensurePresence, it is necessary to meet condition d≤NtWith
Step 4, according to the following formula, build respectively first micro-base station second level launching beam forming matrix and second it is micro-
The second level launching beam forming matrix of base station：
Wherein,Indicate the second level of first micro-base stationTie up launching beam forming matrix, N1Expression is derived from square
Battle arrayKernel matrix, dimension is Indicate first micro-base station to first macro use
The channel matrix at family,Expression is derived from matrixKernel matrix,Indicate first micro-base station to theIt is a
The channel matrix of macro user, D2Indicate any one The non-singular matrix of dimension,Indicate second micro-base station
The second levelLaunching beam forming matrix is tieed up,Expression is derived from matrixKernel matrix, dimension isNKExpression is derived from matrixKernel matrix,Indicate second micro-base station to k-th
The channel matrix of macro user, in order to ensurePresence, it is necessary to meet condition
What the interlayer interference from first micro-base station and second group of macro user that first group of macro user receives received comes from
The interlayer interference of second micro-base station such as following formula：
Wherein,Representing matrixIts dimension is Representing matrixIts dimension isIt byRow neutral element andRow nonzero element forms, in order to ensureOrder non-zero,
It must satisfy conditionThat is K >=4, becauseSo Nt>3Nr。
Step 5, according to the following formula, build first group of macro user respectively receives beamforming matrix and second group of macro user
Receive beamforming matrix：
Wherein,Indicate the N of p-th of macro userr× d dimensions receive beamforming matrix, and span expressions are turned into subspace
Operation,Indicate first micro-base station to p-th of macro user channel matrix,Indicate the N of first of macro userr× d is tieed up
Beamforming matrix is received,The channel matrix for indicating the macro user in second micro-base station to macrocell, in order to ensurePresence, it is necessary to meet condition
Step 6, according to the following formula, build first micro- user respectively receives beamforming matrix and second micro- user
Receive beamforming matrix：
Wherein,Indicate the N of first micro- userr× d dimensions receive beamforming matrix,Indicate second micro- base
It stands to the channel matrix of first micro- user,Indicate the N of second micro- userr× d dimensions receive beamforming matrix,
Indicate first micro-base station to second micro- user channel matrix, in order to ensurePresence, it is necessary to meet item
Part Nr-d≤d。
Step 7, according to the following formula, the launching beam forming matrix of macro base station is built：
Wherein,Indicate the M of macro base stationt× d ' dimension launching beam forming matrix, q=1 ..., K, MtRepresenting matrix V[q, 3]Line number, value be equal to macro base station antenna sum,Representing matrixAnd matrixProduct matrix,Indicate macro base station to first micro- user channel matrix,Representing matrixAnd matrixProduct
Matrix,Indicate macro base station to second micro- user channel matrix,Representing matrixAnd matrixProduct matrix,Indicate the reception beamforming matrix of q-1 macro users,Indicate macro base station
To the channel matrix of q-1 macro users, in order to ensurePresence, it is necessary to meet condition d '≤Mt-2d-(K-1)d′。
Step 8, build respectively first micro-base station first order launching beam forming matrix and second micro-base station the
Level-one launching beam forming matrix.
When macro total number of users is odd number K ' in macrocell, macro user is divided into two groups, macro user [p ', 3] is denoted as first
Group,Macro user [l ', 3] is denoted as second group,
According to the following formula, build respectively first micro-base station first order launching beam forming matrix and two micro-base stations the
Level-one launching beam forming matrix：
Wherein,Indicate the first order of first micro-base stationTie up launching beam forming matrix, NtRepresenting matrix
Line number,Representing matrixColumns, value is equal toIndicate first micro-base station to theThe channel matrix of a macro user,Indicate first micro-base station to a macro users of K ' channel matrix,Table
Show the first order of second micro-base stationLaunching beam forming matrix is tieed up,Indicate second micro-base station to first
The channel matrix of macro user,Indicate second micro-base station to theThe channel matrix of a macro user,Indicate the
Two micro-base stations to a macro users of K ' channel matrix, in order to ensurePresence, it is necessary to meet condition
Step 9, according to the following formula, build respectively first micro-base station second level launching beam forming matrix and second it is micro-
The second level launching beam forming matrix of base station：
Wherein,Indicate the second level launching beam forming matrix of first micro-base station, N1Expression is derived from matrix
Kernel matrix, dimension is Letter of first micro-base station of expression to first macro user
Road matrix,Expression is derived from matrixKernel matrix, NK′Expression is derived from matrixKernel
Matrix,It indicates the in first micro-base station to macrocellThe channel matrix of a macro user, D1Indicate any one
It is aThe non-singular matrix of dimension,Indicate the second level launching beam forming matrix of second micro-base station,Expression is derived from matrixKernel matrix, dimension isNK′Expression is derived from
MatrixKernel matrix, in order to ensurePresence, it is necessary to meet condition
What the interlayer from first micro-base station and second group of macro user that first group of macro user receives received comes from second
The interlayer interference of a micro-base station such as following formula：
Wherein,Representing matrixIts dimension isIt byRow neutral element andRow nonzero element forms,Table
Show matrixIts dimension is It by
Row neutral element andRow nonzero element forms, in order to ensureOrder non-zero, it is necessary to it is full
Sufficient conditionThat is K >=3, becauseSo Nt>3Nr。
Step 10, according to the following formula, build respectively first group of macro user reception beamforming matrix and second group of macro user
Reception beamforming matrix：
Wherein,Indicate the reception beamforming matrix of pth ' a macro user in macrocell,Indicate first
Micro-base station to pth ' a macro user channel matrix,Indicate the reception beamforming matrix of a macro users of l ',Table
Show second micro-base station to a macro users of l ' channel matrix, in order to ensurePresence, it is necessary to meet condition
Step 11, according to the following formula, the reception of the reception beamforming matrix and micro- user of first micro- user is built respectively
Beamforming matrix：
Wherein, I[1,1]Indicate the reception beamforming matrix of micro- user in first Microcell,Expression second is micro-
The channel matrix of micro- user, I in base station to first Microcell[1,2]Indicate second Microcell in micro- user reception wave beam at
Shape matrix,The channel matrix for indicating micro- user in first micro-base station to second Microcell, in order to ensure I[1,1]、I[1 , 2]Presence,
Step 12, according to the following formula, the launching beam forming matrix of macro base station is built：
Wherein,Indicate the launching beam forming matrix of macro base station, q '=1 ..., K ',Representing matrixAnd matrixProduct matrix,Indicate macro base station to first micro- user channel matrix,It indicates
MatrixAnd matrixProduct matrix,Indicate macro base station to second micro- user channel matrix,Representing matrixAnd matrixProduct matrix,Indicate connecing for the macro users of q ' -1
Beamforming matrix is received,Indicate macro base station to -1 macro user of q ' channel matrix, in order to ensureDeposit
, it is necessary to meet condition d≤Mt/(K′+2)。
Step 13, according to the following formula, the multi-user interference from macro base station that macro user receives is eliminated：
Wherein,Indicate macro base station to k-th of macro user channel matrix,Indicate m-th of macro use of macro base station pair
The launching beam forming matrix at family, m ≠ k, 0 expression element are all 0 matrix, and k-th of macro user is in order to decode the expectation of reception
Signal, it is necessary to meet condition
According to the following formula, it eliminates macro user and receives the interlayer interference from all micro-base stations：
Wherein,Indicate i-th of micro-base station to k-th of macro user channel matrix.
According to the following formula, the same layer interference from other micro-base stations that micro- user receives is eliminated：
Wherein,It indicates when macro total number of users is odd number, the reception beamforming matrix of j-th of micro- user,
It indicates when macro total number of users is even number, the reception beamforming matrix of j-th of micro- user,Indicate that i-th of micro-base station arrives
The channel matrix of micro- user in j-th of micro-base station, a micro- users of a ' are in order to decode the desired signal of reception, it is necessary to meet condition
According to the following formula, the interlayer interference from macro base station that micro- user receives is eliminated：
Wherein,Channel matrix of the expression macro base station to j-th of micro- user.
The effect of the present invention can further be proved by following emulation experiment.
1. simulated conditions：
The emulation experiment of the present invention is realized by Matlab simulation softwares, sets a multiple-input and multiple-output down isomeric net
Network, wherein there are two Microcell and a macrocells.Macro base station transmitting antenna sum is 30, and macrocell user sum is 4, each
The antenna sum of microcell base station is Nt, the antenna sum of each Microcell user is 6.
2. emulation content and interpretation of result：
Interference elimination method using the present invention emulates multiple-input and multiple-output down isomeric network, and Fig. 2 is macro base
Transmitting antenna sum of standing is 30, and macrocell user sum is 4, and the antenna sum of each micro- user is 6, when, it is reachable per user
Degree of freedom is about the schematic diagram between micro-base station antenna number.
Abscissa in Fig. 2 indicates that the antenna number of micro-base station, ordinate indicate the degree of freedom per user, with circle mark
The result that broken line mark present invention interference is eliminated.
From figure 2 it can be seen that when macrocell user sum is 4, the reachable degree of freedom per user is with micro-base station day
The increase linear increase of line sum, and reached best reachable degree of freedom, show that interference is effectively eliminated.
Claims (10)
1. a kind of interference elimination method of multiple-input and multiple-output down isomeric network, which is characterized in that the heterogeneous network includes
One macro base station, multiple macro users, two micro-base stations, two micro- users, macro base station service multiple macro users, each micro-base station clothes
Be engaged in a micro- user, and specific steps include as follows：
(1) systematic parameter is set：
M is arranged in macro base stationtN is arranged in root antenna, micro-base stationtRoot antenna, macro user and micro- user setting NrRoot antenna, Mei Gewei
Base station emits d data flow to the micro- user of target, and macro base station emits a data flows of d ', M to each macro usert、Nt、Nr, d, d '
Value is the natural number more than or equal to 1；
(2) judge whether macro total number of users is even number, if so, thening follow the steps (3)；Otherwise, step (8) is executed；
(3) first order transmitting of the first order launching beam forming matrix and second micro-base station of first micro-base station is built respectively
Beamforming matrix：
The half that (3a) arbitrarily chooses macro total number of users forms first group, and remaining macro user forms second group；
(3b) utilizes transposed matrix formula, build respectively first micro-base station first order launching beam forming matrix and second
The first order launching beam forming matrix of micro-base station；
(4) utilize structural matrix formula, build respectively first micro-base station second level launching beam forming matrix and second
The second level launching beam forming matrix of micro-base station；
(5) using being turned into subspace matrices formula, build respectively first group of macro user reception beamforming matrix and second group
The reception beamforming matrix of macro user；
(6) null space matrix formula is utilized, builds the reception beamforming matrix and second micro- use of first micro- user respectively
The reception beamforming matrix at family；
(7) the kernel formula for utilizing multiplication matrix, builds the launching beam forming matrix of macro base station；
(8) first order transmitting of the first order launching beam forming matrix and second micro-base station of first micro-base station is built respectively
Beamforming matrix：
(8a) arbitrarily chooses a macro user, and the half of remaining macro total number of users is formed first with the macro user arbitrarily chosen
Group, the other half of remaining macro total number of users form second group with the macro user arbitrarily chosen；
(8b) utilizes transposed matrix formula, build respectively first micro-base station first order launching beam forming matrix and second
The first order launching beam forming matrix of micro-base station；
(9) utilize structural matrix formula, build respectively first micro-base station second level launching beam forming matrix and second
The second level launching beam forming matrix of micro-base station；
(10) using being turned into subspace matrices formula, build respectively first group of macro user reception beamforming matrix and second group
The reception beamforming matrix of macro user；
(11) null space matrix formula is utilized, builds the reception beamforming matrix and second micro- use of first micro- user respectively
The reception beamforming matrix at family；
(12) the kernel formula for utilizing multiplication matrix, builds the launching beam forming matrix of macro base station；
(13) interference in down isomeric network is eliminated：
(13a) eliminates formula using multi-user interference, eliminates the multi-user interference from macro base station that macro user receives；
(13b) eliminates formula using micro-base station interlayer interference, eliminates the interlayer interference from all micro-base stations that macro user receives；
(13c) eliminates formula using the interference of micro-base station same layer, eliminates the same layer interference from other micro-base stations that micro- user receives；
(13d) eliminates formula using macro base station interlayer interference, eliminates the interlayer interference from macro base station that micro- user receives.
2. the interference elimination method of multiple-input and multiple-output down isomeric network according to claim 1, which is characterized in that step
Suddenly (3b), transposed matrix formula is as follows described in step (8b)：
Wherein, n=1,2, i=1,2,Expression belongs to symbol, and null expressions take kernel to operate, and H indicates transposition operation,
It indicates to be equal to 1 from i micro-base station to the channel matrix of macro user a, n and indicate that macro total number of users is odd number K ',Indicate i-th it is micro-
The first order launching beam forming matrix of base station, when i is equal to 1, a is equal toB be equal to K ' -1, c be equal to K ', subscript from
A to c indicates the subscript of second group of macro user, and when i is equal to 2, a is equal to equal to 1, bC is equal to K ', and subscript is indicated from a to c
The subscript of first group of macro user, n are equal to 2 and indicate that macro total number of users is even number K,Indicate the first order transmitting of i-th of micro-base station
Beamforming matrix, when i is equal to 1, a is equal toB is equal to K-1, and c is equal to K, and subscript indicates second group of macro user from a to c
Subscript, when i be equal to 2 when, a is equal to equal to 1, bC is equal toSubscript indicates the subscript of first group of macro user from a to c.
3. the interference elimination method of multiple-input and multiple-output down isomeric network according to claim 1, which is characterized in that step
Suddenly (4), structural matrix formula is as follows described in step (9)：
Wherein,It indicates when macro total number of users is odd number, the second level launching beam forming matrix of i-th of micro-base station, NaIt indicates
It is derived from matrixKernel matrix, D1Indicate any one The non-singular matrix of dimension,
Value be equal toWhen i is equal to 1, a is equal to equal to 1, bC is equal to K ', and when i is equal to 2, a is equal toB is equal to K ' -1, and c is equal to K ',It indicates when macro total number of users is even number, the second level transmitting of i-th of micro-base station
Beamforming matrix, D2Indicate any oneThe non-singular matrix of dimension,Value be equal toWork as i
When equal to 1, a is equal to equal to 1, bC is equal toWhen i is equal to 2, a is equal toB is equal to K-1, and c is equal to K.
4. the interference elimination method of multiple-input and multiple-output down isomeric network according to claim 1, which is characterized in that step
Suddenly (5), to be turned into subspace matrices formula described in step (10) as follows：
Wherein,It indicates when macro total number of users is odd number, the reception beamforming matrix of k-th of macro user, when i is equal to 1
When,When i is equal to 2, Indicate when macro total number of users be
When even number, the reception beamforming matrix of k-th of macro user, when i is equal to 1,When i is equal to 2,Span expressions are turned into subspace operation,Indicate i-th of micro-base station to k-th of macro user channel square
Battle array.
5. the interference elimination method of multiple-input and multiple-output down isomeric network according to claim 1, which is characterized in that step
Suddenly (6), null space matrix formula is as follows described in step (11)：
Wherein, j=1,2, j ≠ i,It indicates when macro total number of users is odd number, the reception beam forming square of i-th of micro- user
Battle array,It indicates when macro total number of users is even number, the reception beamforming matrix of i-th of micro- user,Indicate j-th it is micro-
Channel matrix of the base station to i-th of micro- user.
6. the interference elimination method of multiple-input and multiple-output down isomeric network according to claim 1, which is characterized in that step
Suddenly (7), the kernel formula of multiplication matrix described in step (12) are as follows：
Wherein,It indicates when macro total number of users is odd number, the launching beam forming matrix of macro base station, q=1 ..., K ',It indicates when macro total number of users is even number, the launching beam forming matrix of macro base station, q=1 ..., K,Indicate square
Battle arrayAnd matrixProduct matrix,Indicate macro base station to first micro- user channel matrix,Table
Show matrixAnd matrixProduct matrix,Indicate macro base station to second micro- user channel matrix,Representing matrixAnd matrixProduct matrix,Indicate the reception of q-1 macro users
Beamforming matrix,Channel matrix of the expression macro base station to q-1 macro users.
7. the interference elimination method of multiple-input and multiple-output down isomeric network according to claim 1, which is characterized in that step
Suddenly it is as follows to eliminate formula for multi-user interference described in (13a)：
Wherein,Indicate macro base station to k-th of macro user channel matrix,Indicate m-th of macro user's of macro base station pair
Launching beam forming matrix, m ≠ k, 0 expression element are all 0 matrix.
8. the interference elimination method of multiple-input and multiple-output down isomeric network according to claim 1, which is characterized in that step
Suddenly it is as follows to eliminate formula for micro-base station interlayer interference described in (13b)：
Wherein,Indicate i-th of micro-base station to k-th of macro user channel matrix.
9. the interference elimination method of multiple-input and multiple-output down isomeric network according to claim 1, which is characterized in that step
Suddenly it is as follows to eliminate formula for the interference of micro-base station same layer described in (13c)：
Wherein,It indicates when macro total number of users is odd number, the reception beamforming matrix of j-th of micro- user,It indicates
When macro total number of users is even number, the reception beamforming matrix of j-th of micro- user,Indicate i-th of micro-base station to j-th
The channel matrix of micro- user in micro-base station.
10. the interference elimination method of multiple-input and multiple-output down isomeric network according to claim 1, which is characterized in that
It is as follows that formula is eliminated in macro base station interlayer interference described in step (13d)：
Wherein,Channel matrix of the expression macro base station to j-th of micro- user.
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