CN104378147A - Uplink pilot frequency distribution method and device for MIMO system - Google Patents

Uplink pilot frequency distribution method and device for MIMO system Download PDF

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Publication number
CN104378147A
CN104378147A CN201310360182.9A CN201310360182A CN104378147A CN 104378147 A CN104378147 A CN 104378147A CN 201310360182 A CN201310360182 A CN 201310360182A CN 104378147 A CN104378147 A CN 104378147A
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pilot frequency
base station
propagation path
frequency pattern
ascending pilot
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CN104378147B (en
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吴克颖
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Nokia Shanghai Bell Co Ltd
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Alcatel Lucent Shanghai Bell Co Ltd
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Priority to CN201310360182.9A priority Critical patent/CN104378147B/en
Priority to TW103122557A priority patent/TW201519595A/en
Priority to PCT/IB2014/001707 priority patent/WO2015022577A1/en
Publication of CN104378147A publication Critical patent/CN104378147A/en
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention relates to an uplink pilot frequency distribution method and device for an MIMO system. In one embodiment, the method for the MIMO system includes the steps that uplink channel estimation is obtained between a set of user equipment and a set of base station equipment; the channel response of a main propagation path is determined through the uplink channel estimation, the channel response of any propagation path is represented to be related to the arriving directions, arriving time and path amplitude; an uplink pilot frequency pattern is distributed to the user equipment according to the set of the arriving directions of the main propagation path of the user equipment. In some embodiment, the different user equipment of which the sets of the arriving directions of the main propagation paths do not intersect with one another can use the same uplink pilot frequency resource repeatedly, and meanwhile, interference with received signals cannot be generated.

Description

Ascending pilot frequency distribution method in mimo system and device
Technical field
The present invention relates generally to mobile communication technology, more specifically, relates to multi-user's multiple-input and multiple-output (MultipleUser Multiple Input Multiple Output, MU MIMO) transmission technology.
Background technology
Extensive antenna system is subject to paying close attention to more and more widely in the benefit reduced in total transmitting power because of it.If extensive antenna system wants practical application, the multiplexing of ascending pilot frequency (pilot) resource will be inevitable.But the performance of extensive antenna system, especially under time division duplex (TDD) pattern, is subject to the multiplexing and restriction of the presence of intercell interference caused of ascending pilot frequency pattern (pilot pattern).
Summary of the invention
A main purpose of the present invention is to provide new for mimo system, especially extensive antenna system, ascending pilot frequency allocative decision, and above-mentioned defect of the prior art can be overcome.
A base station is configured with the linear antenna arrays of N transmitting antenna, and employing number of subcarriers is N fFToFDM (OFDM) system.Wireless multi-path channels is made up of K propagation path, and the time of advent (Time of Arrival, ToA) of each propagation path is τ k, arrival direction (Direction of Arrival, DOA) is θ k, complex amplitude is β k(k=1 ~ K).So the frequency domain representation of channel response can be expressed as
H = [ h 1 , · · · , h N FFT ] = Σ k = 1 K a ( θ k ) β k f H ( τ k ) - - - ( 1 ) ,
Wherein, H is a N × N fFTdimension matrix, the fading coefficients of (n, j) individual element representation n-th transmitting antenna on a jth subcarrier wherein, and h j=[h (1, j) ... h (N, j)] tthe jth row of H.In formula (1),
a(θ k)=[1，exp(ι2πθ k)，…，exp(ι(N-1)2πθ k)] T(2)，
Represent steering vector (steering vector); And
f(τ k)=[1，exp(ι2πWτ k/N FFT)，…，exp(ι2π(N FFT-1)Wτ k/N FFT)] T(3)，
Wherein, w represents system bandwidth, wherein wherein represent the physics angle of arrival in a kth path, d represents the distance between antenna, and λ represents the carrier wavelength of transmission, α=d/ λ.
By such as but not limited to fixing and evenly spaced quantification manner, spatial domain scope and time domain scale can be quantified as the set of virtual angle and dummy delay, thus obtain the expression formula of pseudo channel.Such as, virtual angle and dummy delay can be quantified as
θ ~ q = - α + ( 2 q - 1 ) 2 · Δθ , Q=1 ~ Q, and τ ~ p = ( p - 1 ) · Δτ , p=1～P+1 (4)，
Wherein, with represent q virtual angle and p dummy delay respectively, Δ θ=2 α/Q is the interval between virtual angle, Δ τ=1/W=τ max/ (P+1) is the interval between dummy delay, τ maxbe maximum delay spread, W is system bandwidth.Definition in use formula (4), the channel model in (1) formula can be converted into pseudo channel model by Fourier transform
H (v)=A hhF and H=AH (v)f h(5),
Wherein A = [ a ( θ ~ 1 ) , · · · , a ( θ ~ M ) ] / Q And F = [ f ( τ ~ 1 ) , · · · , f ( τ ~ P + 1 ) ] / N FFT . Virtual channel matrix H (v)be that a Q × (P+1) ties up matrix, wherein the element representation of the capable p row of q is h (v)(q, p), it represents that delay is and angle is the complex amplitude of virtual route.H (v)(q, p) can be represented as
h ( v ) ( q , p ) = Σ k = 1 K β k a H ( θ ~ q ) a ( θ k ) Q f H ( τ k ) f ( τ ~ p ) N FFT ≈ Σ k ∈ S ( q , p ) β k Q N FFT , q＝1～Q，p＝1～P+1(6)，
Wherein, be one group of transmission path, be defined as
S ( q , l ) = { k | - &Delta;&theta; / 2 &le; &theta; ~ q - &theta; k < &Delta;&theta; / 2 , - &Delta;&tau; / 2 &le; &tau; ~ l - &tau; k < &Delta;&tau; / 2 } - - - ( 7 )
Due to the limited amount of transmission path, namely K < < L+1 and P < < N, in many elements be zero, therefore virtual channel matrix H (v)have approximate sparse characteristic, its most element is zero or is in close proximity to zero.And adopt threshold judgement, a limited number of virtual channel matrix coefficient of nonzero element can be obtained.
By Channel Detection, quantification, computing and threshold judgement, the parameter of pseudo channel can be obtained.And based on the parameter of pseudo channel, transmission channel matrix H can be rebuild again.About some specific implementations of Channel Detection, quote in full that application number is 201310134377.1 at this, name is called the Chinese invention patent application of " channel detection method in extensive antenna system and device ", with for referencial use.
Below investigate the impact between the mutually overlapping subscriber equipment of pilot frequency design (pilot pattern).Pilot frequency design represents the resource of distributing to the pilot signal mapping pattern in time frequency space.For simple and clear object, only consider the situation of two subscriber equipmenies that pilot frequency design is mutually overlapping, the service-user of a subscriber equipment Shi Mou community, another subscriber equipment is the interference user in another community.Represent service-user by subscript " S ", subscript " I " represents interference user, removes other subscript, and total upward signal of the service-user that serving BS receives and interference user is expressed as
Y=H SX S+H IX I+N (8)。
Wherein, N represents equivalent noise, and Y represents Received signal strength, X sand X irepresent the transmission signal of service-user and interference user respectively, HS and HI represents service-user and the interference user channel transfer matrices to serving BS respectively.Given channel H, order represent the set of the virtual angle of H, represent d virtual angle, D represents set size.Order represent the set of the dummy delay of H, represent l dummy delay, L represents set size.It is worthy of note, great majority adopt the wireless channel of extensive antenna system all to have openness in time domain and spatial domain, and namely D is much smaller than N, and L is much smaller than τ maxw, wherein τ maxrepresent maximum delay spread, W represents system bandwidth.So H can be with pseudo channel model representation
Wherein, a (θ)=[1, exp (ι 2 π θ) ... exp (ι (N-1) 2 π θ)] t,
f ( &tau; ) [ 1 , exp ( &iota; 2 &pi;W&tau; N FFT ) , &CenterDot; &CenterDot; &CenterDot; , exp ( &iota; 2 &pi; ( N FFt - 1 ) W&tau; N FFT ) ] T , And H (v)=[h (v)(d, l)] be D × L dimension virtual channel matrix, (n, l) wherein individual element h (v)(n, l) representative has delay and angle the complex amplitude of virtual route.
The set expression of the overlap of service-user and interference user or public arrival direction is its size is the set expression of the overlap of service-user and interference user or public pilot tone is its size is order the letter of service-user dry than (SINR) when N is tending towards infinity with linear increase, namely
lim N &RightArrow; &infin; SINR = O ( 1 P ~ &gamma; 2 ) - - - ( 10 ) .
Formula (10) shows: the user that (a) has diverse arrival direction set can use identical pilot frequency design and can not bring negative effect to systematic function; B the worst case of () pilot pollution is that the pilot frequency design of the user with the identical set time of advent is also identical.The optimization of pilot resources distributes can take into full account above 2 points.
In one embodiment, provide a kind of method for mimo system, comprising: obtain the uplink channel estimation between a subscriber equipment and a base station equipment; Determined the channel response in main propagation path by described uplink channel estimation, wherein the channel response of arbitrary propagation path is expressed as relevant to arrival direction, the time of advent, path amplitudes; Come for this user equipment allocation ascending pilot frequency pattern according to the set of the arrival direction in the described main propagation path of described subscriber equipment.Here main propagation path is the propagation path for characterizing uplink transport channel, normally through those paths quantized and retain after threshold judgement.
In an embodiment of said method, described allocation step comprises: if the first ascending pilot frequency pattern for another user equipment allocation of communicating to connect with described base station equipment, be then the second ascending pilot frequency pattern that described user equipment allocation is different from described first pilot frequency design.More preferably, this first pilot frequency design and the second ascending pilot frequency pattern mutually orthogonal.The distribution of uplink pilot signal and pilot detection upgrade with certain cycle, and preferably, a base station equipment will be the user equipment allocation of a newly access and the completely orthogonal ascending pilot frequency pattern of ascending pilot frequency pattern of the subscriber equipment accessed.
In another embodiment of said method, described allocation step comprises: if the set of arrival direction in main propagation path of another subscriber equipment communicated to connect with described base station equipment and the set of the arrival direction in the main propagation path of described subscriber equipment are not occured simultaneously, and the first ascending pilot frequency pattern that has been another user equipment allocation described, be then the first ascending pilot frequency pattern described in described user equipment allocation.Like this, ascending pilot frequency resource can be reused in base station equipment Serving cell, Received signal strength can not be brought again to disturb simultaneously.
In another embodiment of said method, the distributed ascending pilot frequency resource of neighbor cell is mutually orthogonal.
In another embodiment of said method, adjacent pilot resources reuse pattern adopts ascending pilot frequency pattern splitting scheme different from each other.
In other embodiment of said method, described base station equipment is configured with more than 16 transmitting antennas.
In one embodiment, provide a kind of device for mimo system, comprising: acquisition module, be configured to the uplink channel estimation between acquisition subscriber equipment and a base station equipment; Determination module, is configured to the channel response being determined main propagation path by described uplink channel estimation, and wherein the channel response of arbitrary propagation path is expressed as relevant to arrival direction, the time of advent, path amplitudes.Subscriber equipment in an embodiment comprises this device.Base station equipment in an embodiment comprises this device.Here main propagation path is the propagation path for characterizing uplink transport channel, normally through those paths quantized and retain after threshold judgement.
In an embodiment of said apparatus, described device also comprises: distribution module, and the set being configured to the arrival direction in the described main propagation path according to described subscriber equipment comes for this user equipment allocation ascending pilot frequency pattern.
In another embodiment of said apparatus, described distribution module is also configured to: if the first ascending pilot frequency pattern for another user equipment allocation of communicating to connect with described base station equipment, be then the second ascending pilot frequency pattern that described user equipment allocation is different from described first pilot frequency design.
In another embodiment of said apparatus, described distribution module is also configured to: if the set of arrival direction in main propagation path of another subscriber equipment communicated to connect with described base station equipment and the set of the arrival direction in the main propagation path of described subscriber equipment are not occured simultaneously, and the first ascending pilot frequency pattern that has been another user equipment allocation described, be then the first ascending pilot frequency pattern described in described user equipment allocation.
In one embodiment, provide a kind of for the device in the base station equipment of mimo system, comprise: determination module, be configured to the arrival direction in the up main propagation path determined between a subscriber equipment and described base station equipment, wherein the channel response in arbitrary upward propagation path is expressed as relevant to arrival direction, the time of advent, path amplitudes; Distribution module, the set being configured to the arrival direction in the described up main propagation path according to described subscriber equipment comes for this user equipment allocation ascending pilot frequency pattern.Here main propagation path is the propagation path for characterizing uplink transport channel, normally through those paths quantized and retain after threshold judgement.
In an embodiment of said apparatus, described distribution module is also configured to: if the first ascending pilot frequency pattern for another user equipment allocation of communicating to connect with described base station equipment, be then the second ascending pilot frequency pattern that described user equipment allocation is different from described first pilot frequency design.
In another embodiment of said apparatus, described distribution module is also configured to: if the set of arrival direction in main propagation path of another subscriber equipment communicated to connect with described base station equipment and the set of the arrival direction in the main propagation path of described subscriber equipment are not occured simultaneously, and the first ascending pilot frequency pattern that has been another user equipment allocation described, be then the first ascending pilot frequency pattern described in described user equipment allocation.
A kind of base station equipment comprises one of aforementioned arbitrary device.In one embodiment, base station equipment is configured with more than 16 transmitting antennas.
In one embodiment, in system residing for aforementioned arbitrary device or equipment, the distributed ascending pilot frequency resource of neighbor cell is mutually orthogonal.
In yet another embodiment, in system residing for aforementioned arbitrary device or equipment, adjacent pilot resources reuse pattern adopts ascending pilot frequency pattern splitting scheme different from each other.
Foregoing has outlined technical characteristic of the present invention and advantage to be easier to understand to make the detailed description of below the present invention.Other features and advantages of the present invention will be described below, and which form the theme of claim of the present invention.Those skilled in the art will be understood that disclosed concept and embodiment easily can be used as revising or designing other the basis for the structure or flow process that realize the object identical with the present invention.Those skilled in the art should also be understood that such equivalent constructions does not deviate from the spirit and scope of appended claims.
Accompanying drawing explanation
By reference to the accompanying drawings, will be easier to understand about the detailed description of the preferred embodiments of the present invention below.The present invention is explained by way of example, is not limited to accompanying drawing, and Reference numeral similar in accompanying drawing indicates similar element.
Fig. 1 shows applied environment according to an embodiment of the invention;
Fig. 2 shows the flow chart for the method in mimo system according to an embodiment of the invention;
Fig. 3 shows cellular network configuration according to an embodiment of the invention;
Fig. 4 shows the ascending pilot frequency resource allocation map for cellular network configuration shown in Fig. 3 according to an embodiment of the invention;
Fig. 5 and Fig. 6 respectively illustrates the structure chart of the device in the base station equipment and subscriber equipment being applicable to mimo system according to an embodiment of the invention.
Embodiment
The detailed description of accompanying drawing is intended to the explanation as currently preferred embodiment of the present invention, and is not intended to represent that the present invention can be achieved only has form.It should be understood that identical or equivalent function can complete by being intended to the different embodiments be contained within the spirit and scope of the present invention.
Those skilled in the art will be understood that, means described herein and function can use the software function in conjunction with programmable microprocessor and all-purpose computer to realize, and/or use ASIC(Application Specific Integrated Circuit) (ASIC) to realize, and/or use the programmable logic device (PLD) of such as field programmable gate array (FPGA) to realize, and/or use other similar techniques to realize.It is also to be understood that, although the present invention is mainly described with the form of device in method, the present invention also can be embodied as computer program and comprise computer processor and be connected to the system of memory of processor, and wherein memory one or more programs that can complete the function disclosed herein are encoded.
Those skilled in the art will be understood that, base station alleged herein or base station equipment are such as but not limited to the Node B (Node B) in LTE system or lte-a system or evolution Node B (evolved Node B, eNB), technical scheme of the present invention is also not limited to applicable LTE system or lte-a system.
Fig. 1 shows applied environment according to an embodiment of the invention.As shown in the figure, three base station equipments 11,12,13 adjacent, three hexagons schematically show three base station equipments signal service area separately, and three subscriber equipmenies 16,17,18 are positioned within the signal service area of these three base station equipments.
Fig. 2 shows the flow chart for the method 20 in mimo system according to an embodiment of the invention.As shown in the figure, method 20 comprises step 21,22 and 23.
In step 21, obtain the uplink channel estimation between a subscriber equipment and a base station equipment.In step 22, determined the channel response in main propagation path by described uplink channel estimation, wherein the channel response of arbitrary propagation path is expressed as relevant to arrival direction, the time of advent, path amplitudes.In step 23, come for this user equipment allocation ascending pilot frequency pattern according to the set of the arrival direction in the described main propagation path of described subscriber equipment.
20 is example for base station equipment 11 shown in Fig. 1 and the up channel between subscriber equipment 16 in method, and in frequency division duplex system, step 21,22,23 performs by base station equipment 11.In step 21, pilot tone (pilot) signal that base station equipment 11 can send by detecting subscriber equipment 16 obtains uplink channel estimation between the two.And the specific implementation of step 22, the mode described in summary of the invention part can be adopted, also can adopt that application number is 201310134377.1, name is called mode described in the Chinese invention patent application of " channel detection method in extensive antenna system and device ".
In tdd systems, step 21 and/or 22 also can partly or wholly be performed by subscriber equipment.Such as, subscriber equipment 16 can the down-bound pilot frequency signal that sends of base stations detected equipment 11 thus obtain down channel and estimate, then obtains uplink channel estimation according to the channel reciprocity of tdd systems.By subscriber equipment 16 feeding back uplink channel estimating, and the parameter in feature propagation path can be determined by base station equipment 11 from this uplink channel estimation.Also can be determined the parameter in feature propagation path from uplink channel estimation by subscriber equipment 16, and by these parameter feedbacks to base station equipment 11.
In an embodiment of method 20, step 23 comprises: if the first ascending pilot frequency pattern for another user equipment allocation of communicating to connect with described base station equipment, be then the second ascending pilot frequency pattern that described user equipment allocation is different from described first pilot frequency design.More preferably, this first pilot frequency design and the second ascending pilot frequency pattern mutually orthogonal.
The distribution of uplink pilot signal and pilot detection upgrade with certain cycle, and preferably, a base station equipment will be the user equipment allocation of a newly access and the completely orthogonal ascending pilot frequency pattern of ascending pilot frequency pattern of the subscriber equipment accessed.Such as, the up link of the first access base station equipment 11 of subscriber equipment 17, and be assigned with the first ascending pilot frequency pattern; The up link of access base station equipment 11 after subscriber equipment 16, then base station equipment 11 is that subscriber equipment 16 distributes the second ascending pilot frequency pattern orthogonal with the first ascending pilot frequency pattern.
In another embodiment of method 20, step 23 comprises: if the set of arrival direction in main propagation path of another subscriber equipment communicated to connect with described base station equipment and the set of the arrival direction in the main propagation path of described subscriber equipment are not occured simultaneously, and the first ascending pilot frequency pattern that has been another user equipment allocation described, be then the first ascending pilot frequency pattern described in described user equipment allocation.
Base station equipment, when carrying out uplink receiving signal transacting, utilizes the up channel correlation matrix of subscriber equipment to carry out Received signal strength filtering usually.When up channel is expressed as the channel response in main propagation path, and wherein the channel response of arbitrary propagation path is expressed as relevant to arrival direction, the time of advent, path amplitudes, Received signal strength filtering by filter out the arrival direction in the main propagation path of this subscriber equipment set outside other subscriber signals.Therefore, in the Serving cell of same base station equipment, the different user devices that the set of the arrival direction in main propagation path is not occured simultaneously each other can reuse identical ascending pilot frequency resource, Received signal strength can not be brought again to disturb simultaneously.
Fig. 3 shows cellular network configuration according to an embodiment of the invention, and Fig. 4 shows a kind of ascending pilot frequency resource allocation map for cellular network configuration shown in Fig. 3.Cellular network shown in Fig. 3 comprises Gong Jiuge community, community (cell) 1 to community 9.In Fig. 4, arrow represents that frequency becomes general orientation, and 1-1 represents the 1st ascending pilot frequency pattern in community 1, and 9-3 represents the 3rd ascending pilot frequency pattern in community 9, and other analogize known.As shown in Figure 4, the ascending pilot frequency resource of neighbor cell 1,2,3 (or community 4,5,6, or community 7,8,9) is orthogonal.Community 1,4,7 (or community 2,5,8, or community 3,6,9) multiplexing identical uplink pilot signal resource, the uplink pilot signal resource reusability in this example is 1/3.The pilot resources reuse pattern that community 1,4,7 (or community 2,5,8, or community 3,6,9) is adjacent each other each other, the ascending pilot frequency pattern splitting scheme of its respective employing is different from each other.
Fig. 5 and Fig. 6 respectively illustrates the structure chart of the device in the base station equipment and subscriber equipment being applicable to mimo system according to an embodiment of the invention.
As shown in Figure 5, device 50a comprises acquisition module 51, determination module 52 and distribution module 53; Device 50b comprises determination module 52 and distribution module 53; Device 50c comprises distribution module 53.Device 50a, 50b or 50c are configured in base station equipment usually.
Acquisition module 51 is configured to the uplink channel estimation between acquisition subscriber equipment and a base station equipment.Determination module 52 is configured to the channel response being determined main propagation path by described uplink channel estimation, and wherein the channel response of arbitrary propagation path is expressed as relevant to arrival direction, the time of advent, path amplitudes.The set that distribution module 53 is configured to the arrival direction in the described main propagation path according to described subscriber equipment comes for this user equipment allocation ascending pilot frequency pattern.Here main propagation path is the propagation path for characterizing uplink transport channel, normally through those paths quantized and retain after threshold judgement.
As shown in Figure 6, device 60a comprises acquisition module 51 and determination module 52; Device 60b comprises acquisition module 51.Device 60a or 60b is configured in subscriber equipment usually.
For base station equipment in frequency division duplex system 11 and subscriber equipment 16, base station equipment 11 can comprise device 50a as shown in Figure 5.Pilot tone (pilot) signal that acquisition module 51 in the device 50a of base station equipment 11 can send by detecting subscriber equipment 16 obtains uplink channel estimation between the two.And determination module 52 determines the specific implementation of the channel response in main propagation path, the mode described in summary of the invention part can be adopted, also can adopt that application number is 201310134377.1, name is called mode described in the Chinese invention patent application of " channel detection method in extensive antenna system and device ".
With base station equipment 11 middle in tdd systems and subscriber equipment 16, subscriber equipment 16 can comprise device 60a or 60b as shown in Figure 6.Such as, the acquisition module 51 in subscriber equipment 16 can the down-bound pilot frequency signal that sends of base stations detected equipment 11 thus obtain down channel and estimate, then obtains uplink channel estimation according to the channel reciprocity of tdd systems.By subscriber equipment 16 feeding back uplink channel estimating, and the parameter in main propagation path can be determined by the determination module 52 in base station equipment 11 from this uplink channel estimation.Also can be determined the special parameter mainly broadcasting path from uplink channel estimation by the determination module 52 in subscriber equipment 16, and by these parameter feedbacks to base station equipment 11.
In an embodiment of said apparatus, distributor 53 is also configured to: if the first ascending pilot frequency pattern for another user equipment allocation of communicating to connect with described base station equipment, be then the second ascending pilot frequency pattern that described user equipment allocation is different from described first pilot frequency design.More preferably, this first pilot frequency design and the second ascending pilot frequency pattern mutually orthogonal.
The distribution of uplink pilot signal and pilot detection upgrade with certain cycle, and preferably, a base station equipment will be the user equipment allocation of a newly access and the completely orthogonal ascending pilot frequency pattern of ascending pilot frequency pattern of the subscriber equipment accessed.Such as, the up link of the first access base station equipment 11 of subscriber equipment 17, and be assigned with the first ascending pilot frequency pattern; The up link of access base station equipment 11 after subscriber equipment 16, then base station equipment 11 is that subscriber equipment 16 distributes the second ascending pilot frequency pattern orthogonal with the first ascending pilot frequency pattern.
In another embodiment of said apparatus, distributor 53 is also configured to: if the set of arrival direction in main propagation path of another subscriber equipment communicated to connect with described base station equipment and the set of the arrival direction in the main propagation path of described subscriber equipment are not occured simultaneously, and the first ascending pilot frequency pattern that has been another user equipment allocation described, be then the first ascending pilot frequency pattern described in described user equipment allocation.Such as, the up link of the first access base station equipment 11 of subscriber equipment 17, and be assigned with the first ascending pilot frequency pattern; The up link of access base station equipment 11 after subscriber equipment 16, and the set of the arrival direction in the respective up main propagation path of subscriber equipment 17 and 16 is not occured simultaneously, then base station equipment 11 also distributes the first ascending pilot frequency pattern for subscriber equipment 16.
Base station equipment, when carrying out uplink receiving signal transacting, utilizes the up channel correlation matrix of subscriber equipment to carry out Received signal strength filtering usually.When up channel is expressed as the channel response in main propagation path, and wherein the channel response of arbitrary propagation path is expressed as relevant to arrival direction, the time of advent, path amplitudes, Received signal strength filtering by filter out the arrival direction in the main propagation path of this subscriber equipment set outside other subscriber signals.Therefore, in the Serving cell of same base station equipment, the different user devices that the set of the arrival direction in main propagation path is not occured simultaneously each other can reuse identical ascending pilot frequency resource, Received signal strength can not be brought again to disturb simultaneously.
Aforementioned either method and device all may be used for extensive antenna system, and base station equipment is wherein configured with more than 16 transmitting antennas.
Those skilled in the art will be understood that the function of above-mentioned arbitrary module can be divided and are performed by multiple entity module or functional module, and the function of above-mentioned multiple module also can be integrated in an entity module or functional module performs.
Although illustrate and describe different embodiments of the invention, the present invention is not limited to these embodiments.Ordinal numbers such as " first ", " second " that occur in claim only plays the effect of difference, and and does not mean that to there is any specific order or annexation between corresponding component.The technical characteristic only occurred in some claim or embodiment also and do not mean that and can not combine with other features in other claims or embodiment to realize useful new technical scheme.When not deviating from the spirit and scope of the present invention described by claims, many amendments, change, distortion, substitute and equivalent be obvious to those skilled in the art.

Claims (18)

1., for a method for mimo system, comprising:
Obtain the uplink channel estimation between a subscriber equipment and a base station equipment;
Determined the channel response in main propagation path by described uplink channel estimation, wherein the channel response of arbitrary propagation path is expressed as relevant to arrival direction, the time of advent, path amplitudes;
Come for this user equipment allocation ascending pilot frequency pattern according to the set of the arrival direction in the described main propagation path of described subscriber equipment.
2. the method for claim 1, is characterized in that, described allocation step comprises:
If the first ascending pilot frequency pattern for another user equipment allocation of communicating to connect with described base station equipment, be then the second ascending pilot frequency pattern that described user equipment allocation is different from described first pilot frequency design.
3. the method for claim 1, is characterized in that, described allocation step comprises:
If the set of the arrival direction in the set of the arrival direction in the main propagation path of another subscriber equipment communicated to connect with described base station equipment and the main propagation path of described subscriber equipment is not occured simultaneously, and the first ascending pilot frequency pattern that has been another user equipment allocation described, be then the first ascending pilot frequency pattern described in described user equipment allocation.
4. the method for claim 1, is characterized in that, the distributed ascending pilot frequency resource of neighbor cell is mutually orthogonal.
5. the method for claim 1, is characterized in that, adjacent pilot resources reuse pattern adopts ascending pilot frequency pattern splitting scheme different from each other.
6. the method for claim 1, is characterized in that, described base station equipment is configured with more than 16 transmitting antennas.
7., for a device for mimo system, comprising:
Acquisition module, is configured to the uplink channel estimation between acquisition subscriber equipment and a base station equipment;
Determination module, is configured to the channel response being determined main propagation path by described uplink channel estimation, and wherein the channel response of arbitrary propagation path is expressed as relevant to arrival direction, the time of advent, path amplitudes.
8. device as claimed in claim 7, it is characterized in that, described device also comprises:
Distribution module, the set being configured to the arrival direction in the described main propagation path according to described subscriber equipment comes for this user equipment allocation ascending pilot frequency pattern.
9. device as claimed in claim 8, it is characterized in that, described distribution module is also configured to:
If the first ascending pilot frequency pattern for another user equipment allocation of communicating to connect with described base station equipment, be then the second ascending pilot frequency pattern that described user equipment allocation is different from described first pilot frequency design.
10. device as claimed in claim 8, it is characterized in that, described distribution module is also configured to:
If the set of the arrival direction in the set of the arrival direction in the main propagation path of another subscriber equipment communicated to connect with described base station equipment and the main propagation path of described subscriber equipment is not occured simultaneously, and the first ascending pilot frequency pattern that has been another user equipment allocation described, be then the first ascending pilot frequency pattern described in described user equipment allocation.
11. 1 kinds, for the device in the base station equipment of mimo system, comprising:
Determination module, is configured to the arrival direction in the up main propagation path determined between a subscriber equipment and described base station equipment, and wherein the channel response in arbitrary upward propagation path is expressed as relevant to arrival direction, the time of advent, path amplitudes;
Distribution module, the set being configured to the arrival direction in the described up main propagation path according to described subscriber equipment comes for this user equipment allocation ascending pilot frequency pattern.
12. devices as claimed in claim 11, it is characterized in that, described distribution module is also configured to:
If the first ascending pilot frequency pattern for another user equipment allocation of communicating to connect with described base station equipment, be then the second ascending pilot frequency pattern that described user equipment allocation is different from described first pilot frequency design.
13. devices as claimed in claim 11, it is characterized in that, described distribution module is also configured to:
If the set of the arrival direction in the set of the arrival direction in the main propagation path of another subscriber equipment communicated to connect with described base station equipment and the main propagation path of described subscriber equipment is not occured simultaneously, and the first ascending pilot frequency pattern that has been another user equipment allocation described, be then the first ascending pilot frequency pattern described in described user equipment allocation.
14. devices according to any one of claim 7-13, it is characterized in that, the distributed ascending pilot frequency resource of neighbor cell is mutually orthogonal.
15. devices according to any one of claim 7-13, it is characterized in that, adjacent pilot resources reuse pattern adopts ascending pilot frequency pattern splitting scheme different from each other.
16. 1 kinds of subscriber equipmenies, comprise device according to claim 7.
17. 1 kinds of base station equipments, comprise the device according to any one of claim 8-13.
18. base station equipments as claimed in claim 17, it is characterized in that, described base station equipment is configured with more than 16 transmitting antennas.
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