CN107852198A - Apparatus and method for receiver driving precoding - Google Patents
Apparatus and method for receiver driving precoding Download PDFInfo
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- CN107852198A CN107852198A CN201580081554.1A CN201580081554A CN107852198A CN 107852198 A CN107852198 A CN 107852198A CN 201580081554 A CN201580081554 A CN 201580081554A CN 107852198 A CN107852198 A CN 107852198A
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- Prior art keywords
- receiver
- transmitter
- reception device
- cooperative reception
- precoder
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Classifications
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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
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [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
- H04L25/0224—Channel estimation using sounding signals
-
- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
-
- 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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
-
- 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
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0033—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation each allocating device acting autonomously, i.e. without negotiation with other allocating devices
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
Abstract
The present invention proposes a kind of receiver (311) serviced on downlink (321) by multiple antennas transmitter (301).Receiver includes at least one antenna (311a),Suitable for receiving data from transmitter on the uplink,Estimation unit,Suitable for estimating the channel condition information on downlink (321),Connection unit,Suitable in each communication link (331,332) establish and connect with least one cooperative reception device (312) on,And from the channel condition information of the channel (322) between each cooperative reception device (312) receiver transmitter (301) and cooperative reception device (312),Computing unit,The precoder for the downlink (321) between transmitter (301) and receiver (311) is calculated suitable for the channel condition information according to estimation and the channel condition information received,And feedback unit,Suitable for sending the information derived from the precoder of calculating to transmitter (301).
Description
Technical field
The present invention relates generally to the radio communication of wireless communication field, more particularly to support precoding function.
Background technology
In autonomous networkses, it is known that two kinds of solutions are used to be reduced or avoided due to lacking cooperation and caused interference electricity
It is flat.The solution that the first kind of resource allocation (resource allocation, RA) solution can be labeled as is intended to
The algorithm for the resource radio blocks orthogonalise communications that design passes through smart allocation a so that if transmitter is in particular radio
Data are sent in resource (for example, frequency, time slot, code), other transmitters just do not transmit number on identical radio resource
According to.Such as TDMA and CSMA follow this method.The shortcomings that these methods is due to they inefficient of two reasons.The
One, they waste radio resource in time domain and/or frequency domain.Second, they need a certain degree of same between transmitter
Step.The solution of second of type assumes the noiseless high-throughput for having between linkup transmit device and/or all receivers
Backhaul.By this solution, network can use the precoding and decoding optimal in theory for maximizing entire throughput
Scheme.However, the actual limitation of this system is it will be apparent that because muting height is handled up between SC or WiFi access points
The presence of amount backhaul is unlikely that.
In terms of precoding, two kinds of strategies can be distinguished.First strategy is based on a kind of precoding based on code book.At this
In kind of method, precoder and the if necessary respective decoder at receiver by limited quantity the unoptimizable precalculated
Each transmitter selection in pre-coding matrix, wherein these matrixes are all known at transmitters and receivers.In fact,
When receiver receives pilot tone/training symbol from transmitter, it is estimated channel matrix and counted based on some modules
Calculate the index corresponding to optimal precoder.However, first strategy does not have the potentiality made full use of using multiple antennas.The
Two kinds of policy mandates receivers estimate channel, then as channel condition information (channel state
Information, CSI) feed back to transmitter.Afterwards, transmitter designs a specific precoder using this CSI.
The example of possible precoder is high specific combination (maximum ratio combining, MRC) precoding, wherein,ZF (zero-forcing, ZF) precoder, whereinAnd lowest mean square
Error (minimum mean square error, MMSE) transmitter, wherein
Wherein WnIt is the precoder that transmitter n is used,Carry out total CSI feedback of all receivers of free transmitter n services.Should
Negative effect of the strategy for reducing intra-cell interference is effective, but the negative effect not to inter-cell interference is responsible.
In view of above-mentioned, many cordless communication networks are based on two examples：Multi-antenna, also referred to as multiple-input and multiple-output
(multiple-input and multiple-output, MIMO) method and full rate reuse.The example of these examples can be with
Found in WiFi or LTE cordless communication networks.MIMO has by mitigating the negative effect disturbed and declined to substantially improve
The potentiality of the performance of cordless communication network, and full rate reuse makes frequency spectrum take maximization by cost of increased interference level.
Centralized network provides many modes for realizing the target.
In the present context, the base station (BS) interfered or the complete CSI of processing transmitter can be by precoding/ripples
Beam shaping manages multi-user interference, and the complete CSI is on the information for the channel for leading to the receiver not serviced or user.It is real
On border, by using the special construction of MIMO precodings, base station or transmitter can mitigate more by using ZF precoders
User disturbs.More effectively, base station, which can launch filtering using MMSE and add maximizing the signal interference at all receivers, makes an uproar
Acoustic ratio (signal to interference plus noise ratio, SINR).
However, there is presently no the existing solution for cordless communication network, wherein both without cooperation between transmitter
Also without coordination.The example of this cordless communication network is such as WiFi, cell (small-cells, SC), Femto cell
(femto-cells, FC).
Fig. 1 shows the example of the de-centralized wireless communication system 100 with MIMO equipment.System 100 includes three
Three base stations of the form of multiple antennas transmitter 101,102,103 and receiver 111,112,113.Transmitter 101,102,
103 be, for example, WiFi access points, and receiver 111,112,113 is, for example, such as tablet personal computer, laptop computer or intelligence electricity
The handheld device of words.
First receiver 111 is serviced on the first downlink 121 by the first transmitter 101.Similarly, the second receiver
112 are serviced on the second downlink 124 by the second transmitter 102, and the 3rd receiver 113 is in the 3rd downlink 128
On serviced by the 3rd transmitter 103.In addition, even if the first receiver 111 not by second and the 3rd transmitter 102,103 services,
There is respective channel 126,129 respectively between second and the receiver 111 of the 3rd transmitter 102,103 and the first.Similarly,
Two receivers 112 are not by first and the 3rd transmitter 101,103 services, and the 3rd receiver 113 by the first and second hairs
Device 101,102 is sent to service.However, from first and the 3rd transmitter 101, there is respective channel in the 103 to the second receiver 112
123,127, and respective channel 122,125 be present from the receiver 113 of the first and second transmitter the 101,102 to the 3rd.
When the first receiver 111 is serviced via downlink 121 by the first transmitter 101, by the first receiver 111 from
Other second and the 3rd transmitter 102,103 channels 126,129 received cause interference at the first receiver 111.In Fig. 1
In, therefore these channels 126,129 are identified as interference channel.
Interference consumingly limits autonomous multi-user/multicell network (such as WiFi and cell) performance.On the one hand,
The multiple antennas transmitter known has zero or mitigates the ability of negative effect of the interference to network performance, but cost is to concentrate
Change.On the other hand, the interference in de-centralized cordless communication network is difficult to tackle, if transmitter is not coordinated with, more
Add and be difficult to tackle.
The content of the invention
Disadvantages mentioned above and problem are recognized, it is contemplated that improving prior art.Especially, it is an object of the invention to provide
A kind of improved radio communication with reduced interference.
The present invention is intended in particular to the radio communication improved in non-pooled network, and does not need the association between transmitter
Make.It is contemplated that mitigate interference caused by receiver.
The above-mentioned purpose of the present invention is realized by the solution provided in accompanying independent claim.In each appurtenance
The Advantageous implementations of the present invention are further defined in it is required that.
The first aspect of the present invention provides a kind of receiver serviced on the uplink by multiple antennas transmitter.It is described
Receiver includes at least one antenna for being suitable to receive data from transmitter on the uplink.Receiver includes being suitable to estimation pass
In the estimation unit of the channel condition information of downlink.Receiver includes connection unit, suitable on each communication link and extremely
A few cooperative reception device establishes connection, and from each cooperative reception device receive the transmitter and the cooperative reception device it
Between channel channel condition information.Receiver includes computing unit, suitable for the channel condition information according to the estimation and institute
The channel condition information for stating reception calculates precoder for the downlink between transmitters and receivers.Receiver includes
Feedback unit, it is suitable to send the information derived from the precoder of the calculating to the transmitter.
Therefore, the present invention can compensate the cooperation missing between transmitter, particularly above and below MIMO un-coordinated net frk
Wen Zhong, and can reduce and disturb and increase the SINR at receiver.Receiver can be advantageously employed on from transmitter to
The knowledge of the interference channel of cooperative reception device, so as to which feedback of the information to transmitter is done with reducing the minizone at cooperative reception device
Disturb.
In the way of realization according to the receiver of first aspect, information is suitable to by sending out derived from the precoder of calculating
Device is sent to be used to carry out precoding to downlink.Therefore, can by it is a kind of it is completely sightless to transmitter in a manner of perform interference
Reduce.
In another way of realization of the receiver according to first aspect, the precoder calculated is that maximum-ratio combing is pre-
Encoder or Zero Forcing precoder, or the combination of maximum-ratio combing precoder and Zero Forcing precoder.So as to further
Reduce interference.
In another way of realization of the receiver according to first aspect, the connection unit is adapted in use to and for described
The different radio access technologies of the radio access technologies of the downlink between transmitter and the receiver come with
At least one cooperative reception device establishes connection.Therefore, transmitter department level is other cooperates not necessarily.
In another way of realization of the receiver according to first aspect, connection unit is suitable at least one cooperate with described
Receiver establishes self-organizing network.
In another way of realization of the receiver according to first aspect, connection unit is suitable to and at least one cooperative reception
Device establishes the connection of Wi-Fi direct, bluetooth or device-to-device.
In another way of realization of the receiver according to first aspect, the connection unit is asked suitable for broadcast collaboration,
Receive the response to the cooperation request from least one cooperative reception device, and based on the response, with it is described at least
One cooperative reception device establishes the connection.
In another way of realization of the receiver according to first aspect, connection unit is suitable on each communication link and extremely
A few cooperative reception device, which establishes connection and is that connection unit is suitable to establish with other multiple receivers, to be connected, and from it is multiple its
He selects at least one cooperative reception device in receiver.
In another way of realization of the receiver according to first aspect, connection unit is suitably selected at least one association
Make receiver so that
Wherein on each downlink, one or more other multiple antennas transmitters are via RiIndividual antenna serves each select
The cooperative reception device selected,
Wherein
-R0The quantity of at least one antenna of the receiver, the receiver be used for from the transmitter to
The downlink of the receiver,
-Be selectively on cooperative reception device, the amount R of antennajSummation,
-T0Be for from the transmitter to the transmitter of the downlink of the receiver antenna number
Amount, and
-{Ti| i ≠ 0 } it is all other transmitters for including the cooperative reception device for serving the selection, institute
State the set of the quantity of the antenna of other transmitters.
In another way of realization of the receiver according to first aspect, the receiver is suitable to and at least one association
Consult the strategy for calculating the precoder as receiver.
In another way of realization of the receiver according to first aspect, the precoder calculated is that maximum-ratio combing is pre-
The combination of encoder and Zero Forcing precoder.The receiver is suitable to consult to be used to calculate with least one cooperative reception device
The strategy of the precoder, horizontal to limit selfish degree, the selfish degree is horizontal to limit the maximum-ratio combing precoder
With the combination of the Zero Forcing precoder.
In another way of realization of the receiver according to first aspect, the estimation unit is suitable to be based on by under described
Pilot tone that line link receives from the transmitter and/or training signal estimate the channel condition information.
In another way of realization of the receiver according to first aspect, the computing unit is suitable to by by the transmission
Between the channel matrix of the downlink between device and the receiver, and the transmitter and each cooperative reception device
Each channel matrix of each channel, it is stacked to build the channel matrix of extension, with based on the extended channel square
Battle array calculates the precoder.
In another way of realization of the receiver according to first aspect, the computing unit is suitable to produce
- according to equation ρMRC=hN, rThe maximum-ratio combing corresponding with the channel matrix of the downlink prelists
Code device,
- according to equationZero Forcing precoder,
WhereinIt is that dimension is NrUnit matrix, andIt only by zero dimension formed is (M-N to ber)×Nr's
Matrix, and suitable for calculating the precoder according to below equation：
P=α ρMRC+(1-α)ρZF
Wherein α is that the selfish degree between 0 and 1 is horizontal.
In another way of realization of the receiver according to first aspect, the feedback unit is suitable to calculate the precoding
Device it is inverse, and using it is described it is inverse as derived from the precoder of the calculating information be sent to the transmitter.
In another way of realization of the receiver according to first aspect, receiver includes estimation unit, is closed suitable for estimation
In the channel condition information from other transmitters to the channel of the receiver, receiver includes connection unit, suitable for each logical
Believe to establish with cooperative reception device on link and connect.The receiver is not by other transmitter services, and the cooperation connects
Device is received on each downlink by other transmitter services.The receiver is suitable to described in cooperative reception device transmission
The channel condition information of estimation.
Thus, cooperative reception device can be utilized on, to the knowledge of the interference channel of receiver, being incited somebody to action from other transmitters
Precoder information feeds back to other transmitters, and the precoder information can reduce the inter-cell interference at receiver.
The second aspect of the present invention provides a kind of receiver, including：Estimation unit, suitable for estimation on from transmitter to
The channel condition information of the channel of the receiver, the receiver include connection unit, its be suitable on each communication link with
Cooperative reception device establishes connection.The receiver is not serviced by the transmitter, and the cooperative reception device is in each descending chain
Serviced on road by the transmitter.The channel status that the receiver is suitable to send the estimation to the cooperative reception device is believed
Breath.
Thus, cooperative reception device can utilize the knowledge on the interference channel from transmitter to receiver, will prelist
Code device feedback of the information can reduce the inter-cell interference at receiver to the transmitter, the precoder information.
According in first aspect or the way of realization of the receiver of second aspect, the estimation unit is suitable to be based on passing through
Pilot tone that the channel receives from the transmitter and/or training signal estimate the channel condition information.
The third aspect of the present invention provides a kind of communication network, including multiple receptions according to first aspect or second aspect
Device and multiple antennas transmitter.
The fourth aspect of the present invention provide it is a kind of on the uplink by the method for multiple antennas transmitter service receiver,
And interference caused by by being reduced from transmitter to the channel of cooperative reception device at cooperative reception device.The receiver and institute
State cooperative reception device and establish connection on the communication link.The receiver estimation is believed on the channel status of the downlink
Breath.The cooperative reception device estimation is believed on the channel status from the transmitter to the channel of the cooperative reception device
Breath.The receiver receives the institute on being estimated by the cooperative reception device on the communication link from the cooperative reception device
State the channel condition information of channel.The receiver is according to the estimation channel condition information on the downlink
And calculated on the channel condition information of the reception of the channel for the institute between the transmitter and the receiver
State the precoder of downlink.Receiver sends the information derived from the precoder calculated to the transmitter.Therefore,
This method propose can perform cooperation to realize the receiver collaboration protocols of target capabilities on transmitter.
The further feature of method according to a fourth aspect of the present invention or realization can according to the previous aspect of the present invention and its
Different ways of realization performs the function of receiver.
The fifth aspect of the present invention provides a kind of computer program with program code, when the computer program exists
When being run on computing device, described program code is used to perform method according to a fourth aspect of the present invention.
The present invention is expected that receiver communicates for one group of MIMO transmitter with it must without any between transmitter
The cooperation wanted or the system of coordination.Realize that the receiver of the present invention establishes a communication channel, in the communication channel, exchange
Relevant CSI some auxiliary informations, so as to allow each receiver to establish feedback, once received by respective service transmitter
To the precoder that can influence to realize in transmitter is serviced.The precoder can suitable for all cooperative reception equipment of raising
Realize speed.
This is entirely to be occurred in a manner of a kind of invisible or transparent for transmitter so that the present invention is in many
It is particularly attractive under scene.For example, in one embodiment, the present invention can adopt in multi-provider/business system
With within the system, supplier/operator can not control the transmitter for being manufactured by another supplier or being possessed by another operator
Behavior.In another embodiment, the present invention can be used in following system, i.e., deployed infrastructure/
The system that standard performs any mutually beneficial precoding/beam forming not in sender side.
The present invention proposes a kind of particularly non-pooled, and does not need and is solved in the network to be cooperated between transmitter
The scheme of interference problem.Present invention particularly provides the load that transmission calculates the effective ways for avoiding interference, will calculate effectively
The load of precoder is sent to receiver from transmitter.In other words, the present invention proposes to formulate determining centered on receiver
Plan process.
The present invention has increase overall network handling capacity simultaneously transparent to transmitter, without network/transmitting-receiving of costliness
The advantages of device modification is to realize identical target.In other words, it is every while using traditional pre-coding scheme by the present invention
Raising of the individual transmitter to overall performance produces contribution, without carrying out cooperation explicitly or implicitly or association between transmitter
Adjust.
The idea of the present invention is to utilize the knowledge of the interference channel on cooperative reception device, to feed back mitigation cooperative reception
The precoder of the negative effect of device.This mitigation is favourable, because for transmitter, the mitigation is with complete sightless side
Formula occurs.Because all receivers of network can apply the strategy of the present invention, so the institute to be cooperated by the present invention
There is receiver to undergo significant performance gain, so as to increase overall network throughput.Present invention produces with receiver
Centered on scene, wherein overcome prior art network limitation, without the further cost of operator or manufacturer.
It must be noted that all devices, element, unit and device described in this application can be with software or hardware members
Part or its any kind of combination are realized.All steps for being performed by various entities described in this application and it is described as
The function of being performed by various entities is intended to indicate that each entity is adapted or configured to perform respective step and function.Even in tool
In the following description of body embodiment, the specific function or step that are formed completely by external entity not implement the particular step or
Reflected in the description of the specific detailed elements of the entity of function, then these methods and work(to those skilled in the art
It is able to can be realized in respective software or hardware element or its any kind of combination.
Brief description of the drawings
Aforementioned aspect of the present invention and way of realization will be explained in the description for the specific embodiment for being related to accompanying drawing below, its
In
Fig. 1 shows the de-centralized cordless communication network according to prior art,
Fig. 2 shows cordless communication network according to embodiments of the present invention,
Fig. 3 shows cordless communication network according to another embodiment of the present invention,
Fig. 4 shows cordless communication network according to another embodiment of the present invention,
Fig. 5 shows method according to embodiments of the present invention,
Fig. 6 shows method according to another embodiment of the present invention,
Fig. 7 shows application scenarios according to embodiments of the present invention,
Fig. 8 shows application scenarios according to another embodiment of the present invention, and
Fig. 9 shows performance gain according to embodiments of the present invention.
Embodiment
Fig. 2 shows cordless communication network 200 according to embodiments of the present invention.
Fig. 2 embodiment is sent out according to the specific embodiment of the general cordless communication network of the present invention, and by N number of autonomy
Device is sent to form, the index being incorporated into is n ∈ { 1 ..., N }, transmitter n is connected to KnIndividual receiver.Here, feature autonomy refers to
Transmitter does not exchange or especially, it is impossible to the fact that exchange any information between them, therefore show as in same radio
Other transmitters are not present in resource block.
The embodiment of this network is it is shown in fig. 2, and including WiFi network and SC networks etc..Each transmission in network
Device is provided with Mn1 antenna of ＞, and receiver is equipped with Nr>=1 antenna.MIMO between transmitter n and receiver r is descending
Link channel is by matrixRepresent.Such as that is communicated for FDD (frequency-division duplexing, FDD)
Sample, it is assumed that pass through downlink pilot/training sequence estimated matrix in each receiverBy stacking all of transmitter n
It is expected that the channel matrix of receiver, i.e., for all receivers serviced by transmitter n, obtain the letter according to below equation (1)
Road matrix：
Therefore the signal received by receiver r can express according to following equatioies (2)：
Wherein
-xnTransmitter n transmission symbolic vector is represented, and
-wrRepresent additive noise vector.
In equation (2), three items can be identified：
The Section 1 of-expression useful signal
The Section 2 of-expression intra-cell interferenceAnd
The Section 3 of-expression inter-cell interference
In this case, downlink works within the same frequency band.Therefore, generation interferes, and communicate
Hydraulic performance decline.Even if transmitter is not coordinated with, intra-cell interference can also be mitigated using MIMO technology.Especially, it is assumed that each
Transmitter uses the precoder of its selection based on the CSI feedback from its receiver.That is, each transmitter perform with
Under general precoding strategy：
Wherein
-WnIt is the precoder that transmitter n is used,
-fnIt is certain reversible precoding function, such as any such as reversible high specific combination (MRC), ZF or MMSE are passed
Defeated normal linearity precoding strategy, and
-The CSI feedback of transmitter n all receivers is attached to, i.e.,It is all to be connect by what transmitter n was serviced
Receive the overall CSI feedback of device.
According to known technology, it can will represent that the Section 2 of the above-mentioned equation (2) of intra-cell interference minimizes, or even
More effectively, can maximize the SINR of all receivers.
Fig. 2 is returned to, cordless communication network 200 includes two transmitters 201,202.Transmitter 201,202 is multiple antennas hair
Device is sent, and each transmitter especially includes three antennas.Cordless communication network 200 includes being serviced by the first transmitter 201
The first receivers 211,212,213 and from each descending of first the 201 to the first receivers of transmitter 211,212,213
Link 221,222,223.Cordless communication network 200 also includes the second receivers 214,215 serviced by the second transmitter 202
And each downlink 234,235 from second the 202 to the second receivers of transmitter 214,215.
In addition, even if the first receivers 211,212,213 is not serviced by the second transmitter 202, in the second transmitter 202
Respective channel 231,232,233 be present between the first receivers 211,212,213.Similarly, even if second group of reception
Device 214,215 is not serviced by the first transmitter 201, is existed between the first transmitter 201 and the second receivers 214,215 each
From channel 224,225.
Fig. 2 cordless communication network 200 actually includes two autonomous networkses, and two autonomous networkses include the first hair respectively
Send the transmitter 202 of device 201 and second.The transmission of first transmitter 201 causes the receiver 214 serviced by the second transmitter 202,
Interference at 215, vice versa.Channel 224,225 correspondingly causes inter-cell interference at receiver 214,215, and channel
231,232,233 cause inter-cell interference at receiver 211,212,213.
The receiver 211,212,213,214,215 of Fig. 2 embodiment includes an antenna respectively.According to connecing for the present invention
More than one antenna can alternatively be included by receiving device, and therefore can be multiple antenna receiver.Transmitter 201,202 is, for example,
Base station or WiFi access points.Receiver 211,212,213,214,215 is, for example, handheld device, such as tablet personal computer, notebook electricity
Brain or smart mobile phone.
Fig. 3 shows cordless communication network 300 according to another embodiment of the present invention.
According to an embodiment of the invention, Fig. 3 shows and connect on downlink 321 by what multiple antennas transmitter 301 serviced
Receive device 311.The receiver 311 includes at least one antenna for being suitable to receive data from transmitter 301 on downlink 321
311a.Receiver 311 includes being suitable to estimation unit of the estimation on the channel condition information of downlink 321.Receiver 311 wraps
Connection unit is included, is connected suitable for being established on each communication link 331,332 with least one cooperative reception device 321, and from every
Individual cooperative reception device 312 receives the channel status letter of the channel 322 between the transmitter 301 and the cooperative reception device 312
Breath.Receiver 311 includes computing unit, believes suitable for the channel condition information according to the estimation and the channel status of the reception
Breath calculates the precoder for the downlink 321 being used between transmitter 301 and receiver 311.Receiver 311 includes feedback
Member, it is suitable to send the information derived from the precoder of the calculating to the transmitter 301.
Correspondingly, when receiver 311 is serviced by the transmitter 301 on downlink 321, cooperative reception device 312 not by
Transmitter 301 services.The channel 322 defined between transmitter 301 and cooperative reception device 312 represents interference channel, and it is used for
Received at cooperative reception device 312.
Therefore, receiver 311 is suitable to using the knowledge on interference channel 322, by precoder feedback to transmitter
301, the precoder mitigates the negative effect of cooperative reception device 312, that is, reduces the inter-cell interference at cooperative reception device 312.
According to an embodiment of the invention, receiver 311 includes estimation unit, suitable for estimation on from other transmitters 302
To the channel condition information of the channel 324 of the receiver 311, the receiver 311 includes connection unit, and it is suitable to each logical
Believe to establish with cooperative reception device 321 on link 331,332 and connect.The receiver 311 is not serviced by the transmitter 302, and
And the cooperative reception device 312 is serviced on each downlink 323 by the transmitter 302.The connection unit is suitable to institute
State the channel condition information that cooperative reception device 312 sends the estimation.
Correspondingly, cooperative reception device 312 rather than receiver 311 are to be taken on downlink 323 by other transmitters 302
Business.The channel 324 defined between other transmitters 301 and receiver 312 represents the interference letter of the reception at receiver 312
Road.
Therefore, receiver 311 is suitable to the channel condition information for estimating the interference channel 324, and by the channel status of estimation
Information is sent to cooperative reception device 312.In turn, cooperative reception device 312 can utilize the knowledge on interference channel 324, with
Give precoder feedback to other transmitters 302, the precoder mitigates the negative effect of receiver 311, that is, reduces receiver
Inter-cell interference at 311.
Similar to embodiment as shown in Figure 2, transmitter 301,302 is multiple antennas transmitter, and each sends utensil
Body includes three antenna 301a, 301b, 301c and 302a, 302b, 302c respectively.Fig. 2 receiver 311,312 includes one respectively
Individual antenna.More than one antenna can alternatively be included according to the receiver of the present invention, and therefore can be that multiple antennas receives
Device.Fig. 3 transmitter 301,302 and more generally, the transmitter according to the present invention is, for example, base station or WiFi access points.Figure
3 receiver 311,312, more generally, the receiver according to the present invention is, for example, handheld device, such as tablet personal computer, notebook
Computer or smart mobile phone.
In figure 3, h2,1Represent from receiver 311 to the channel matrix of the unidirectional communications link 331 of cooperative reception device 312,
And h1,2Represent from cooperative reception device 312 to the channel matrix of the unidirectional communications link 332 of receiver 311.Receiver 311 and association
Make receiver 312 equipped with the ability for being exchanged between data.At least when receiver 311 and close cooperative reception device 312,
The exchange of data can be carried out wirelessly.This can be for example by the way that WiFi is direct-connected, bluetooth or any device-to-device (device-
To-device, D2D) radio access technologies (radio access technology, RAT) realize.
Fig. 4 shows cordless communication network 400 according to another embodiment of the present invention.Cordless communication network 400 corresponds to
Fig. 3 cordless communication network 300.Cordless communication network 400 is included in the reception serviced on downlink 421 by transmitter 401
Device 411, it corresponds to the receiver 311 serviced on downlink 321 by transmitter 301.Cordless communication network 400 is included in
The cooperative reception device 412 serviced on downlink 423 by other transmitters 402, its correspond on other downlinks 323 by
The cooperative reception device 312 that other transmitters 302 service.In addition, cordless communication network 400 includes connecing to cooperation from transmitter 401
Receive the channel 422 of device 412 and from other transmitters 402 to the channel 424 of receiver 411, it is corresponded respectively to from transmitter 301
To the channel 322 of cooperative reception device 312 and from other transmitters 302 to the channel 324 of receiver 311.
Difference between Fig. 3 and Fig. 4 embodiment is the data exchange between receiver 411 and cooperative reception device 412.
The data exchange of channel condition information is performed via other networks 430.By the unidirectional communications link 432 to other networks 430,
Other networks 430, and performed from other networks 430 to the unidirectional communications link 433 of cooperative reception device 412 from receiver 411
To the data exchange of cooperative reception device 412.By the unidirectional communications link 434 to other networks 430, other networks 430, and
From other networks 430 to the unidirectional communications link 431 of cooperative reception device 411, perform from cooperative reception device 412 to receiver 411
Data exchange.Other networks 430 can be for example based on cloud computing, or relaying or transponder.
Fig. 5 shows method 500 according to an embodiment of the invention, and it is used to be sent out by multiple antennas on downlink 321
The service receiver 311 of device 301 is sent, and is reduced at cooperative reception device 312 by from transmitter 301 to cooperative reception device 312
Interference caused by channel 322.
According to this method, receiver 311 and cooperative reception device 312 establish 501 connections on communication link 331,332.Institute
State receiver 311 and estimate 502 channel condition information on the downlink 321.The cooperative reception device 312 estimate on
From the transmitter 301 to the channel condition information of the channel 322 of the cooperative reception device 312.The receiver 311 exists
504 are received on being estimated by the cooperative reception device 312 from the cooperative reception device 312 on 331,332 on the communication link
The channel 322 the channel condition information.The receiver 311 is estimated according on the downlink 321
The channel condition information of meter and channel condition information on the reception of the channel 322, which calculate, 505 is used for the transmission
The precoder of the downlink 321 between device 301 and the receiver 311.Receiver 311 is to the transmitter 301
The information derived from the precoder of the calculating of transmission 506.
Advantageously, receiver 311 is suitable to using the knowledge on interference channel 322, by precoder feedback to transmission
Device 301, the precoder mitigate the negative effect of cooperative reception device 312, that is, reduce the minizone at cooperative reception device 312 and do
Disturb.
Advantageously, the inter-cell interference of the receiver 311 caused by interference channel 324 can also be reduced.Therefore, receive
Device 311 is estimated on from other transmitters 302 to the channel condition information of the channel 324 of receiver 311.Cooperative reception device 312
Estimation is on from other transmitters 302 to the channel condition information of the downlink 323 of cooperative reception device 312.The cooperation connects
Receive device 312 331,332 on the communication link on from the receiver 311 receive by the receiver 311 estimate on
The channel condition information of the channel 324.Cooperative reception device 312 is according to the estimation channel status on downlink 323
Information and calculated relative to the receiving channel state information of channel 324 between other transmitters 302 and cooperative reception device 312
Downlink 323 precoder.The cooperative reception device 312 sends pre- from what is calculated to other transmitters 302
Information derived from encoder.
Fig. 6 shows method 600 according to another embodiment of the present invention.Receiver 311 is on downlink 321 by more days
Line transmitter 301 services, and method is suitable to reduce by the channel 322 from transmitter 301 to cooperative reception device 312 in cooperative reception device
Interference caused by 312.Method 600 can be realized by the corresponding baseband functions block of receiver 311 and cooperative reception device 312.
Method 600 includes findings that and answered the step 601 found.The purpose of the step is built upon the model for realizing the present invention
Enclose the connection between interior receiver, i.e. the connection for example between receiver 311 and other multiple receivers.This connection
It is referred to as shaking hands.Connected for establishing, receiver 311 is straight by appropriate radio access technologies (RAT) such as WiFi
Even or bluetooth carrys out the request of broadcast collaboration.The baseband module of other multiple receivers carries out response.Then in receiver 311 and more
Connection is established between each in other individual receivers.Other the multiple receivers are one group of potential cooperative reception devices.
Method 600 also includes the step 602 of cooperative reception device selection.Have built up in receiver 311 and connect with multiple other
After the connection for receiving device, receiver 311 is suitable to select at least one cooperative reception device 312 from other multiple receivers.From latent
Cooperative reception device, i.e., select cooperative reception device group 312 from other connected multiple receivers.
Selection is based on different standards.In one embodiment of the invention, for select other multiple receivers it
One as the selection standard of cooperative reception device can be receiver 311 and the distance between other receivers and/or other connect
The antenna amount of receipts machine.
The advantages of choice phase, is that it makes the antenna of receiver 311 and cooperative reception device 312 sum be less than transmitter
301 and other transmitters 302 of service receiver 311 and cooperative reception device 312 transmission antenna minimum number.Therefore,
Receiver 311 is suitably selected at least one cooperative reception device 312 so that below equation is verified：
Wherein on each downlink 323, one or more other multiple antennas transmitters 302 are via RiIndividual antenna 312a
The each selected cooperative reception device 312 of service, and
Wherein
-R0It is at least one antenna 311a of the receiver 311 quantity, the receiver 311 is used for from described
Transmitter 301 arrives the downlink 321 of the receiver 311,
-It is antenna 312a amount R j summation on be allowed a choice cooperative reception device 312,
-T0It is for the transmitter from the transmitter 301 to the downlink 321 of the receiver 311
301 antenna 301a, 301b, 301c quantity, and
-{Ti| i ≠ 0 } it is all other transmitters for including the cooperative reception device 312 for serving the selection
302, the set of the antenna 302a, 302b, 302c of other transmitters 302 quantity.
In the fig. 3 embodiment, R0=1, because receiver 311 has an antenna 311a,It is because unique
Cooperative reception device 312 there is antenna a 312a, T0=3, because the transmitter 301 for serving receiver 311 has three
Antenna 301a, 301b, 301c and { Ti| i ≠ 0 }={ 3 }, because the other transmitters 302 for serving cooperative reception device 312 have
Three antennas 302a, 302b, 302c.For Fig. 3 embodiment, because 1+1≤min (3,3) equation (4) is verified.
This cooperative reception device selection 602 can be used for excluding have other very high ambulant receivers, because
It may not be cooperated well for receiver 311 and with other very high ambulant receivers.The step it is minimum defeated
It is a group to go out, including receiver 311 and cooperative reception device 312, and the antenna sum K of wherein cooperative equipment is necessarily less than involved
Transmitter minimum antenna amount.
Method 600 includes further cooperation level and negotiated a price and establishment step 603.The receiver 311 selected in step 602
What kind of precoding plan is used to negotiate a price or consult based on available information content with least one cooperative reception device 312
Slightly.The minimum output of the step is the precoding strategy to be used, such as ZF or MRC.The optional output of the step is selfish degree
Horizontal and/or transmission SNR is horizontal.The level of selfish degree can be defined as parameter alpha, and the parameter alpha limits the precoder of calculating
The combination of precoder and Zero Forcing precoder is combined for high specific.
Method 600 also includes further information gathering procedure 604.Necessary information, such as the letter on interference channel
Breath is estimated based on the pilot tone/training signal sent by interference transmitter, i.e., is sent by transmitter 301.Therefore, receiver 311
The channel condition information on downlink 321 can be estimated, and the cooperative reception device 312 can be estimated on from described
Channel condition information of the transmitter 301 to the interference channel 322 of the cooperative reception device 312.
Method 600 also includes further information exchange step 605.The receiver 311 that selects in step 602 and at least
One cooperative reception machine 312 exchanges the information created needed for feedback, especially with regard to the information of interference channel.Especially, come from
The reception (504) of cooperative reception device 312 can send it on from transmitter 301 to cooperative reception device 312 to receiver 311
Interference channel 322 channel condition information estimation.The transmission is carried out on communication link 332.In one embodiment, lead to
Cross RAT (such as bluetooth or WiFi direct-connected) or for example, by other networks 430 based on cloud computing or repeater or transponder come
Exchange necessary information.
Method 600 includes further precoder calculation procedure 606.
Precoder calculation procedure 606 can be designed according to some standards.In one embodiment of the invention, can be true
Standard is calibrated to reach Pareto optimal solution as described below.
In the first sub-step, labeled as " r " receiver 311 according to below equation by the channel matrix of their own and association
Make receiver 312 channel matrix be stacked form extension channel matrix
Wherein
-The channel matrix of receiver 311 is represented, and
-Represent the channel square of the i cooperative reception device 312 labeled as from " 1 " to " i "
Battle array.
Dimension be Mn× K, wherein：
- K is receiver 311 and the antenna sum of the equipment of cooperative reception device 312, wherein preferablyWith
And
-MnIt is transmitter n antenna number.
It is worth noting that, meet necessary condition M all the time in precoder calculates 606 stepsn≤K。
In the second sub-step, ZF precoders are assessed according to below equation：
Wherein
-It is that dimension is NrUnit matrix, and
-It only by zero dimension formed is (M-N to ber)×NrMatrix.
In the 3rd sub-step, MRC precoders are assessed according to below equation：
ρMRC=hN, r. (7)
In the 4th sub-step, the precoder according to desired by calculating below equation：
P=α ρMRC+(1-α)ρZF (8)
Wherein α is the level of selfish degree.
MRC precodings substantially will be applied on transmitter 301 by value α=1, and can be referred to as selfish selection, and
Value α=0 will apply ZF precodings, and can be referred to as profit he select.
Method 600 also includes further feedback signal transmission step 607.In this step, the baseband block of receiver 311
It is final to create feedback signal, and it is sent to the transmitter 301 of service receiver 311.Prelisted based on what is calculated in step 606
Code device P, receiver 311 calculate and send the vector as feedback to transmitter：
f-1(P). (9)
Assuming that precoding function f is reversible.In this respect, it is notable that such as MRC, ZF and MMSE's etc
Standard and universal precoding function are all reversible.Especially, MMSE is widely used close to optimal linear solution party
Case.
Fig. 7 shows application scenarios according to embodiments of the present invention.Application scenarios are based on cordless communication network 700.Wirelessly
Communication network 700 corresponds to Fig. 3 cordless communication network 300.Cordless communication network 700 is included on downlink 721 by sending out
The receiver 711 for sending device 701 to service, it corresponds to the receiver 311 serviced on downlink 321 by transmitter 301.Wirelessly
Communication network 700 is included in the cooperative reception device 712 serviced on downlink 723 by other transmitters 702, and it corresponds at it
The cooperative reception device 312 serviced on its downlink 323 by other transmitters 302.In addition, cordless communication network 700 include from
To the channel 722 of cooperative reception device 712 and from other transmitters 702 to the channel 724 of receiver 711, it distinguishes transmitter 701
Corresponding to the channel 322 from transmitter 301 to cooperative reception device 312 and from other transmitters 302 to the channel of receiver 311
324。
Transmitter 701 and other transmitters 702 can be belong to heterogeneous networks operator cell or replacement it is pico-
Cell or Femto cell.Or transmitter 701 and other transmitters 702 can be built by different suppliers.Preferably,
Transmitter 701 and other transmitters 702 can be equipped with multiple antennas.
Transmitter 701 and other transmitters 702 can be the WiFi access points for belonging to different operators, or by different confessions
Answer business to build, and be preferably equipped with multiple antennas.
Cordless communication network 700 can be related to device-to-device communication, wherein preferably at least transmitter 301 and other hairs
Device 702 is sent equipped with multiple antennas.
Fig. 8 shows application scenarios according to another embodiment of the present invention.Application scenarios are based on cordless communication network 800,
It can be similar to the cordless communication network in Fig. 3.Cordless communication network 800 is included on downlink 821 by transmitter 801
The receiver 811 of service, it corresponds to the receiver 311 serviced on downlink 321 by transmitter 301.Wireless communication networks
Network 800 is included in the cooperative reception device 812 serviced on downlink 823 by other transmitters 802, and it corresponds to other descending
The cooperative reception device 312 serviced on link 323 by other transmitters 302.In addition, cordless communication network 800 is included from transmitter
801 to the channel 822 of cooperative reception device 812 and from other transmitters 802 to the channel 824 of receiver 811, and it is corresponded respectively to
From transmitter 301 to the channel 322 of cooperative reception device 312 and from other transmitters 302 to the channel 324 of receiver 311.
In fig. 8 it is shown that the example of macro-cell communication.Cordless communication network 800 is in the form of cellular communications networks
In the presence of.Transmitter 801 is present in the form of base station, and it limits the cell 803 of cellular communications networks, and similarly, Qi Tafa
Send device 802 and exist in the form of the base station of cellular communications networks.Receiver 811 and cooperative reception machine 812 are respectively close to small
The edge in area and respectively by the interference from other transmitters 802 and the transmitter 801.
Fig. 9 shows performance gain according to embodiments of the present invention.
For assessment performance, it is contemplated that according to the network of Fig. 3 embodiment, i.e. including transmitter and other transmitters, with
And the network of receiver and cooperative reception device, the transmitter and other transmitters described connect each equipped with three antennas
Device and cooperative reception device are received each equipped with an antenna.Performance is measured with SINR.Especially, it is anti-in Pareto optimality
In the case that feedback creates program, also the different selfish horizontal α of degree value is measured.
The performance gain that the idea proposed is brought relative to art methods is as shown in Figure 9.Especially, it is related to single small
The performance of the prior art of area's precoder is marked as MRT and shows low spectrum efficiency.According to the present invention's
The precoding of receiver driving is marked as RDP, shows more preferable spectrum efficiency.
Different RDP performance shows significant SNR gaps relative to prior art.As regularization inverse precoder
RDP is better than other less complex methods by cost of higher computation complexity.It is noted that make value α=0, i.e., always
To transmitter apply ZF precoders, can be become close in the case of high snr values it is optimal, i.e., when the performance of network is by cell
During the interior and strong limitation of inter-cell interference.
The various embodiments and implementation for having been combined as example describe the present invention.However, art technology
Personnel can understand and realize other changes from accompanying drawing, the research of the disclosure and independent claims, and practice calls are protected
The invention of shield.In claim and specification, the word of " comprising " one is not excluded for other elements or step, and indefinite article
"one" or " one " are not excluded for plural situation.Discrete component or other units can realize several realities described in claim
The function of body or project.The fact that enumerate some measures in mutually different dependent claims is not offered as these measures
Combination cannot be used for favourable realization.
Claims (20)
1. a kind of receiver (311), serviced on downlink (321) by multiple antennas transmitter (301),
Including
- at least one antenna (311a), suitable for receiving data from the transmitter (301) on the downlink (321),
- estimation unit, suitable for estimating the channel condition information on the downlink (321),
- connection unit, connected suitable for being established on each communication link (331,332) with least one cooperative reception device (312),
And received from each cooperative reception device (312) between the transmitter (301) and the cooperative reception device (312)
Channel (322) channel condition information,
- computing unit, the channel condition information suitable for the channel condition information according to the estimation and the reception, which calculates, to be used for
Precoder (the ρ of the downlink (321) between the transmitter (301) and the receiver (311)ZF, ρMRC, P),
- feedback unit, suitable for sending the precoder (ρ from the calculating to the transmitter (301)ZF, ρMRC, P) derived believe
Breath.
2. receiver according to claim 1,
Wherein from the precoder (ρ of the calculatingZF, ρMRC, P) derived from described information be suitable to be used for by the transmitter (301)
Downlink described in precoding (321).
3. receiver according to any one of the preceding claims,
Precoder (the ρ of wherein described calculatingZF, ρMRC, P) and it is maximum-ratio combing precoder (ρMRC) or Zero Forcing precoder
(ρZF) or the maximum-ratio combing precoder (ρMRC) and the Zero Forcing precoder (ρZF) combination (P).
4. receiver according to any one of the preceding claims,
Wherein described connection unit is adapted in use to and for described between the transmitter (301) and the receiver (311)
The radio access technologies that the radio access technologies of downlink (321) are different come and at least one cooperative reception device
(312) connection is established.
5. receiver according to any one of the preceding claims,
Wherein described connection unit is suitable to establish self-organizing network with least one cooperative reception device (312).
6. receiver according to any one of the preceding claims,
Wherein described connection unit is suitable to establish Wi-Fi direct, bluetooth or equipment with least one cooperative reception device (312)
Connected to equipment.
7. receiver according to any one of the preceding claims,
Wherein described connection unit is asked suitable for broadcast collaboration, is received from least one cooperative reception device (312) to described
Cooperated the response asked, and based on the response, the connection is established with least one cooperative reception device (312).
8. receiver according to any one of the preceding claims,
The wherein described company for being suitable to establish connection with least one cooperative reception device (312) on each communication link (331,332)
Order member includes,
The connection unit, which is suitable to establish with other multiple receivers, to be connected, and
At least one cooperative reception device (312) is selected from other the multiple receivers.
9. receiver (311) according to claim 8,
Wherein described connection unit is suitably selected at least one cooperative reception device (312) so that
Wherein on each downlink (323), one or more other multiple antennas transmitters (302) are via RiIndividual antenna
The cooperative reception device (312) that (312a) service each selects,
Wherein
-R0It is the quantity of at least one antenna (311a) of the receiver (311), the receiver (311) is used for from institute
The downlink (321) that transmitter (301) arrives the receiver (311) is stated,
-Be selectively on cooperative reception device (312), the amount R of antenna (312a)iSummation,
-T0It is to be used for from the transmitter (301) to the transmitter of the downlink (321) of the receiver (311)
(301) quantity of antenna (301a, 301b, 301c), and
-{Ti| i ≠ 0 } it is all other transmitters for including the cooperative reception device (312) for serving the selection
(302), the set of the quantity of the antenna (302a, 302b, 302c) of other transmitters (302).
10. receiver according to any one of the preceding claims,
Wherein described receiver (311) is suitable to consult to be used to calculate described prelist with least one cooperative reception device (312)
The strategy of code device (ρ ZF, ρ MRC, P).
11. receiver according to claim 10,
The wherein described precoder (ρ ZF, ρ MRC, P) calculated is that maximum-ratio combing precoder (ρ MRC) and ZF prelist
The combination (P) of code device (ρ ZF),
And wherein described receiver (311) is described for calculating suitable for consulting with least one cooperative reception device (312)
The strategy of precoder (ρ ZF, ρ MRC, P), to limit selfish degree (α) level, the selfish degree (α) is horizontal to limit the maximum
Than the combination (P) for merging precoder (ρ MRC) and the Zero Forcing precoder (ρ ZF).
12. receiver according to any one of the preceding claims,
Wherein described estimation unit is suitable to based on the pilot tone received by the downlink (321) from the transmitter (301)
And/or training signal estimates the channel condition information.
13. receiver according to any one of the preceding claims,
Wherein described computing unit is suitable to by will be described descending between the transmitter (301) and the receiver (311)
Channel matrix (the h of link (321)N, r), each letter between the transmitter (301) and each cooperative reception device (312)
Each channel matrix (h in road (322)N, 1..., hN, i), it is stacked to build the channel matrix of extension
With based on the extended channel matricesTo calculate the precoder.
14. receiver according to claim 13,
Wherein described computing unit is suitable to produce
- according to equation ρMRC=hN, r.With the channel matrix (h of the downlink (321)N, r) corresponding maximum-ratio combing
Precoder (ρMRC),
- according to equationZero Forcing precoder (ρ ZF),
WhereinIt is that dimension is NrUnit matrix, andIt only by zero dimension formed is (M-N to ber)×NrMatrix,
And suitable for calculating the precoder according to below equation：
P=α ρMRC+(1-α)ρZF
Wherein α is that the selfish degree included between 0 and 1 is horizontal.
15. receiver according to any one of the preceding claims,
Wherein described feedback unit is suitable to calculate the inverse of the precoder, and will be described inverse as prelisting from the calculating
Code device (ρZF, ρMRC, P) derived from information be sent to the transmitter (301).
16. advantageously according to the receiver (311) any one of preceding claims,
Including
- estimation unit, suitable for estimating the channel status on the channel (324) from transmitter (302) to the receiver (311)
Information,
- connection unit, connected suitable for being established on each communication link (331,332) with cooperative reception device (312),
Wherein described receiver (311) is not serviced by the transmitter (302), and the cooperative reception device (312) is under each
Serviced on line link (323) by the transmitter (302),
Wherein described receiver (311) is suitable to the channel condition information that the estimation is sent to the cooperative reception device (312).
17. receiver (311) according to claim 16,
Wherein described estimation unit be suitable to based on the pilot tone that is received by the channel (324) from the transmitter (302) and/or
Training signal estimates the channel condition information.
18. a kind of communication network, including multiple receivers according to any one of the preceding claims (311) and described more
Antenna transmitter (301).
19. one kind is used for by multiple antennas transmitter (301) service receiver (311) on downlink (321), and reduces
Cooperative reception device (312) place is as caused by from the transmitter (301) to the channel (322) of the cooperative reception device (312)
The method of interference,
Wherein
- the receiver (311) and the cooperative reception device (312) establish (501) connection on communication link (331,332),
The channel condition information of-the receiver (311) estimation (502) on the downlink (321),
- cooperative reception device (312) estimates (503) on from the transmitter (301) to the described of the cooperative reception device (312)
The channel condition information of channel (322),
- the receiver (311) receives (504) from the cooperative reception device (312) on the communication link (331,332) and closed
In the channel condition information for the channel (322) estimated by the cooperative reception device (312),
- the receiver (311) is according to the channel condition information of the estimation on the downlink (321) and on institute
The channel condition information calculating (505) for stating the reception of channel (322) is used for the transmitter (301) and the receiver
(311) precoder (ρ ZF, ρ MRC, P) of the downlink (321) between, and
- receiver (311) sends (506) to the transmitter (301) and led from the precoder (ρ ZF, ρ MRC, P) of the calculating
The information gone out.
20. a kind of computer program with program code, described when the computer program is run on a computing device
Program code is used to perform the method according to claim 11.
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