CN104410977B - A kind of same frequency heterogeneous network broadcast channel interference management method based on cognitive learning - Google Patents

A kind of same frequency heterogeneous network broadcast channel interference management method based on cognitive learning Download PDF

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Publication number
CN104410977B
CN104410977B CN201410722423.4A CN201410722423A CN104410977B CN 104410977 B CN104410977 B CN 104410977B CN 201410722423 A CN201410722423 A CN 201410722423A CN 104410977 B CN104410977 B CN 104410977B
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base station
micro
microcell
user
macrocell
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CN104410977A (en
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万晨
王德胜
林宏志
刘文旭
夏鹏敏
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The invention discloses a kind of same frequency heterogeneous network broadcast channel interference management method based on cognitive learning, including：(1) Microcell and macrocell cooperation carry out correlated channels estimation and feedback, obtain macro base station to the down channel vector H of micro-base stationP,SWith the down channel vector g of macro base station to Microcell user kk,P；(2) micro-base station utilizes channel vector HP,SThe transmission signal of macro base station link is intercepted, time of intercept is α T, detects the broadcast message x of macro base station linkP, wherein T is the code word duration of grand link, and α is micro-base station time of intercept ratio, 0≤α ＜ 1；(3) micro-base station selectsAs pre-coding matrix, wherein GP,SFor micro-base station to the channel matrix between macrocell receiver；(4) Microcell user k encodes to obtain reception signal yk.In isomery with frequency communication system, Microcell ensures that to the zero interference of macrocell and Microcell the interference from macrocell can be eliminated.

Description

A kind of same frequency heterogeneous network broadcast channel interference management method based on cognitive learning
Technical field
It is wide more particularly, to a kind of same frequency heterogeneous network based on cognitive learning the invention belongs to communication technical field Broadcast channel disturbance management method.
Background technology
Along with the increasingly rare of wireless frequency spectrum, it is intended to improve the cognitive radio (cognitive of frequency spectrum service efficiency Radio) technology has obtained great concern and very extensive research in past ten years.Nowadays cellular cell towards Under the trend of high density isomery layering networking, cognitive radio plays an important role to the interference management of complex network.Traditional idea It is：When the frequency spectrum for detecting macrocell (macro cell) is being in idle at certain time, Microcell (micro cell) can To be communicated using the idle running time-frequency resource, to avoid unnecessary frequency spectrum waste.Notice in the above-mentioned of cognitive radio Critically important one is assumed to be " the available free running time-frequency resource of macrocell " in thinking.But in the design of future cognitive radio, While maintaining its communications status with greater need for a kind of macrocell, Microcell can also utilize on the premise of macrocell is not influenceed completely Identical frequency spectrum carries out reliable communication, the multi-user served in the Microcell.
Therefore, further isomery co-channel interference management method should cause, on the one hand, Microcell needs to ensure not to grand Cell produces any interference；On the other hand, Microcell must also effectively cope with the interference from macrocell.
The content of the invention
It is an object of the invention to propose in isomery with frequency communication system, Microcell ensure to the zero interference of macrocell and Microcell can eliminate the method for the interference from macrocell.This method is realized (in following all subscripts by following steps In, symbol " P " is meant that primary, i.e. macrocell, and " S " then represents secondary, i.e. Microcell):
A kind of same frequency heterogeneous network broadcast channel interference management method based on cognitive learning, it is characterised in that the side Method comprises the following steps：
(1) Microcell and macrocell cooperation carry out correlated channels estimation and feedback, obtain macro base station to the descending of micro-base station Channel vector Hp,sWith the down channel vector g of macro base station to Microcell user kk,p；
(2) micro-base station utilizes channel vector HP,SThe transmission signal of macro base station link is intercepted, time of intercept is α T, is detected The broadcast message x of macro base station linkP, wherein T is the code word duration of grand link, and α is micro-base station time of intercept ratio, 0≤α ＜ 1；
(3) micro-base station selectsAs pre-coding matrix, matrix effect is by it Transmission signal is to GP,SThe orthogonal complement space projection of corresponding subspace, so as to eliminate interference of the Microcell to macrocell user, its Middle GP,SFor micro-base station to the channel matrix between macrocell receiver；
(4) Microcell user k encodes to obtain reception signal yk, reception signal ykIt is expressed as：
WhereinFor from micro-base station to Microcell user k equivalent channels vector, hk,STo be used in Microcell Family k channel vectors, xkFor Microcell user k transmission signal, K is the total number of users in Microcell, sk=xPgk,PIt is macro base station to micro- Community user k external disturbance,For kth road noise.
In one embodiment of the present of invention, the step (1) specifically includes：
(1-1) micro-base station reports user in the Microcell to use pilot frequency sequence { s by return link to macro base stationuAnd it is micro- Base station pilot sequence { smicro, macro base station informs that macrocell user uses pilot frequency sequence { p by the linku}；
(1-2) macrocell utilizes known pilot { smicro, { suDown channel estimation is carried out, macro base station is obtained to micro-base station Down channel vector Hp,s=[(smicro Hsmicro)-1smicro Hymicro]TSweared with the down channel of macro base station to Microcell user k Measure gk,p=[(su,k Hsu,k)-1su,k Hyu,k]T, wherein ymicroLaunch corresponding pilot tone { s for microcell base station kmicroWhen macro base station Reception signal, yu,kLaunch corresponding pilot tone { s for user ku,kWhen macro base station reception signal, su,kMiddle subscript k refers to set { suIn K-th of user, subscript H represent conjugate transposition；
(1-3) macro base station passes through return link feedback channel vector HP,S, gk,PTo micro-base station；
(1-4) micro-base station utilizes pilot frequency sequence { su, obtain user k channel vectors h in Microcellk,S=[(su,k Hsu,k)- 1su,k HyS,k]T, su,kMiddle subscript k refers to set { suIn k-th of user, yS,kMicro- base when launching pilot tone for k-th of Microcell user The reception signal stood, micro-base station utilize pilot frequency sequence { puEstimate interference channel vector G of the micro-base station to macrocell userP,S= [(pu Hpu)-1pu Hyu]T, yuLaunch micro-base station reception signal during pilot tone for macrocell user.
In one embodiment of the present of invention, the least square method based on known pilot sequence is utilized in the step (1-2) Down channel vector is estimated with the reciprocity of time-division system up-downgoing channel.
Compared with prior art, the inventive method has following technological merit and effect：
(1) this programme make it that interference of the microcell base station to macrocell receiver is zero, while eliminates macro cell base station pair The interference of Microcell receiver；
(2) there are extremely considerable raising, the cognitive communications side using the more non-cognition situation of the speed achieved by this programme The speed of case keeps rapid growth with the raising of signal to noise ratio, and its speed and the asymptotic speed that is drawn by free degree formula Closely；
(3) the interference management strategy is applied to the isomery identical networking of similar hierarchy, for example, the program may be used as The interference solution of microcellulor broadcast channel.
Brief description of the drawings
Fig. 1 is grand, Microcell interference cases the system models of the present invention；
Fig. 2 is subsystem interference management flow chart of the present invention based on causality cognition；
Fig. 3 shows the total speed comparison curves of disturbance Managed Solution subsystem (Microcell) under different signal to noise ratio.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below Conflict can is not formed each other to be mutually combined.
The present invention relates in isomery identical networking cell, Microcell is simultaneously sharp on the premise of macrocell is not influenceed completely The method that reliable communication is carried out with same frequency spectrum, in particular, it is that Microcell is based on causal cognition study macro cell message, enters A kind of method of the broadcast channel interference management of capable cooperation.
As shown in figure 1, the present invention is applied to the time division multiplex system that grand, Microcell uses identical frequency to be communicated, and Microcell is multiaerial system broadcast channel.xP, xsThe respectively transmission signal vector of macro base station and micro-base station, GP,SRepresent from micro- Channel matrix of the base station to macrocell user receiver；hk,SRepresent from micro-base station to the channel of k-th of Microcell receiver user Vector, gk,PIt is K then to represent from macro base station to the channel vector of k-th of Microcell receiver user, the total number of users in Microcell.
As shown in Fig. 2 the step of same frequency heterogeneous network broadcast channel interference management method of the present invention based on cognitive learning It is as follows：
(1) Microcell and macrocell cooperation carry out correlated channels estimation and feedback, obtain macro base station to the descending of micro-base station Channel vector HP,SWith the down channel vector g of macro base station to Microcell user kk,P；Sub-step is as follows：
(1-1) micro-base station reports user in the Microcell to use pilot frequency sequence { s by return link to macro base stationuAnd it is micro- Base station pilot sequence { smicro, macro base station informs that macrocell user uses pilot frequency sequence { p by the linku}；
(1-2) macrocell utilizes known pilot { smicro, { suDown channel estimation is carried out, down channel vector is estimated Method can be by existing more ripe least square method and time-division system up-downgoing channel based on known pilot sequence Reciprocity, macro base station is obtained to the down channel vector H of micro-base stationp,s=[(smicro Hsmicro)-1smicro Hymicro]TAnd macro base station To Microcell user k down channel vector gk,p=[(su,k Hsu,k)-1su,k Hyu,k]T, wherein ymicroSent out for microcell base station k Penetrate corresponding pilot tone { smicroWhen macro base station reception signal, yu,kLaunch corresponding pilot tone { s for user ku,kWhen macro base station reception Signal, su,kMiddle subscript k refers to set { suIn k-th of user, yu,kRepresent that user's pilot tone corresponds to reception signal, subscript H is represented Conjugate transposition；
(1-3) macro base station passes through return link feedback channel vector HP,S, gk,PTo micro-base station；
(1-4) utilizes pilot frequency sequence { s with channel estimation methods in above-mentioned steps, micro-base stationu, obtain user in Microcell K channel vectors hk,S=[(su,k Hsu,k)-1su,k HyS,k]T, su,kMiddle subscript k refers to set { suIn k-th of user, yS,kFor Microcell The reception signal of micro-base station, micro-base station utilize pilot frequency sequence { p when k-th of user launches pilot toneuEstimate micro-base station to macrocell The interference channel vector G of userP,S=[(pu Hpu)-1pu Hyu]T, yuMicro-base station when launching pilot tone for macrocell user receives letter Number.
(2) micro-base station utilizes channel information HP,SThe transmission signal of macro base station link is intercepted, time of intercept is α T, and (T is grand The code word duration of link, α are micro-base station time of intercept ratio, 0≤α ＜ 1), detect the broadcast message of macro base station link xP。
(3) micro-base station selects(assuming that matrix Gp,sRow full rank) it is used as precoding square Battle array, matrix effect are to G by its transmission signalP,SThe orthogonal complement space projection of corresponding subspace, so as to eliminate Microcell pair The interference of macrocell user.Wherein GP,SFor micro-base station to the channel matrix between macrocell receiver.
(4) Microcell user k transmission signal is xk, when the message to k-th of Microcell user encodes, due to Our the cognitive learnings broadcast message x of macro base stationP, it is possible thereby to try to achieve external disturbance s of the macro base station to Microcell user kk= xPgk,P, we it is known that the encoded signal of encoded preceding k-1 user, thus we can be by user k reception signal Equally it is expressed as
WhereinFor kth road noise, the total number of users in Microcell is K, and thus micro-base station can be compiled according to dirty paper code strategy Code, wherein being from micro-base station to Microcell user k equivalent channels vector：hk,SBelieve for user k in Microcell Road vector.
As shown in figure 3, the speed achieved by the interference management scheme proposed by the invention based on cognitive learning is recognized compared with nothing Informed shape has extremely considerable raising, in fact, the speed of secondary microcell system enters soon under without cognition situation Flat bed, and the speed of cognitive communications scheme then keeps rapid growth with the raising of signal to noise ratio, and its speed with by the free degree The asymptotic speed that formula is drawn is very close, i.e., can obtain more considerable rate gain and free degree gain.Program exhibition Show great potential of the multiple antennas in cognitive radio system, on the other hand also show good interference management strategy in net Critical importance under network scene.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included Within protection scope of the present invention.

Claims (3)

  1. A kind of 1. same frequency heterogeneous network broadcast channel interference management method based on cognitive learning, it is characterised in that methods described Comprise the following steps：
    (1) Microcell and macrocell cooperation carry out correlated channels estimation and feedback, obtain macro base station to the down channel of micro-base station Vector HP,SWith the down channel vector g of macro base station to Microcell user kk,p；
    (2) micro-base station utilizes channel vector HP,SThe transmission signal of macro base station link is intercepted, time of intercept is α T, detects grand base Stand the broadcast message x of linkP, wherein T is the code word duration of grand link, and α is micro-base station time of intercept ratio, 0≤α ＜ 1；
    (3) micro-base station selectsAs pre-coding matrix, matrix effect is to be launched Signal is to GP,SThe orthogonal complement space projection of corresponding subspace, so as to eliminate interference of the Microcell to macrocell user, wherein GP,SFor micro-base station to the channel matrix between macrocell receiver, subscript H represents conjugate transposition；
    (4) Microcell user k encodes to obtain reception signal yk, reception signal ykIt is expressed as：
    WhereinFor from micro-base station to Microcell user k equivalent channels vector, hk,SBelieve for user k in Microcell Road vector, xkFor Microcell user k transmission signal, K is the total number of users in Microcell, sk=xPgk,PMicrocell is used for macro base station Family k external disturbance, zkFor kth road noise.
  2. 2. the method as described in claim 1, it is characterised in that the step (1) specifically includes：
    (1-1) micro-base station reports user in the Microcell to use pilot frequency sequence { s by return link to macro base stationuAnd micro-base station Pilot frequency sequence { smicro, macro base station informs that macrocell user uses pilot frequency sequence { p by the linku}；
    (1-2) macrocell utilizes known pilot { smicro, { suDown channel estimation is carried out, macro base station is obtained under micro-base station Row channel vector Hp,s=[(smicro Hsmicro)-1smicro Hymicro]TDown channel vector with macro base station to Microcell user k gk,p=[(su,k Hsu,k)-1su,k Hyu,k]T, wherein ymicroLaunch corresponding pilot tone { s for microcell base station kmicroWhen macro base station connect The collection of letters number, yu,kLaunch corresponding pilot tone { s for user ku,kWhen macro base station reception signal, su,kMiddle subscript k refers to set { suIn K user, subscript H represent conjugate transposition, and subscript T represents transposition；
    (1-3) macro base station passes through return link feedback channel vector HP,S, gk,PTo micro-base station；
    (1-4) micro-base station utilizes pilot frequency sequence { su, obtain user k channel vectors in Microcell su,kMiddle subscript k refers to set { suIn k-th of user, yS,kThe reception letter of micro-base station when launching pilot tone for k-th of Microcell user Number, micro-base station utilizes pilot frequency sequence { puEstimate interference channel vector G of the micro-base station to macrocell userP,S=[(pu Hpu)- 1pu Hyu]T, yuLaunch micro-base station reception signal during pilot tone for macrocell user.
  3. 3. method as claimed in claim 1 or 2, it is characterised in that utilized in step (1-2) based on known pilot sequence most The reciprocity of small square law and time-division system up-downgoing channel is estimated down channel vector.
CN201410722423.4A 2014-12-02 2014-12-02 A kind of same frequency heterogeneous network broadcast channel interference management method based on cognitive learning Expired - Fee Related CN104410977B (en)

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CN106162727B (en) * 2015-03-31 2019-08-27 北京邮电大学 User equipment establishes method, small base station and the macro base station of connection
CN110233751B (en) * 2019-05-27 2022-06-28 曲阜师范大学 Heterogeneous hybrid network performance analysis method based on interference equivalence
CN110445577B (en) * 2019-06-27 2021-09-03 福建师范大学 System and method for edge resource reuse and interference elimination of heterogeneous network base station

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