CN103368698A - Multi-in-put multi-out-put (MIMO) pre-coding method, equipment and system - Google Patents
Multi-in-put multi-out-put (MIMO) pre-coding method, equipment and system Download PDFInfo
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Abstract
The embodiment of the invention provides a multi-in-put multi-out-put (MIMO) pre-coding method, equipment and a system, which relates to the field of communication, can reduce interferences in MIMO system transmission, and reduces feedback overhead. The MIMO data transmission method comprises that a first receiving terminal receives indicative information indicating a second code word sent by a transmitting terminal and a data channel which finishes pre-coding according to the second code word; the received data information acquired by the data channel is decoded according to the second code word; a second receiving terminal calculates a second code word having the minimum interference for the second receiving terminal in a codebook; indicative information indicating the second code word is fed back to the transmitting terminal, and the transmitting terminal receives the indicative information fed back by the second receiving terminal; the data channel is pre-coded according to the second code word; and the indicative information indicating the second code word and the data channel which finishes pre-coding according to the second code word are sent to the first receiving terminal. The embodiment of the invention is applied to a multi-in-put multi-out-put communication system.
Description
Technical field
The present invention relates to the communications field, relate in particular to method for precoding, the equipment and system of a kind of multiple-input and multiple-output MIMO.
Background technology
MIMO of today (Multiple-In-put Multiple-Out-put, multiple-input and multiple-output) technology can be with the throughput of the wireless communication systems that is multiplied at existing running time-frequency resource.In the transfer of data of multi-user MIMO system, can interfere with each other between the multi-user, cause signal power decay, thus prior art wish by the precoding algorithm, to reduce inter-user interference, reduce signal power losses.
But there is the incomplete problem of channel condition information of feedback in multi-user MIMO pre-encoding system actual commercial in multi-user MIMO system, becomes the focus of research so can realize the precoding algorithm design of the performance of expecting under the Limited Feedback condition.
Existing multi-user pre-coding algorithm mainly contains dirty paper code, ZF, block diagonalization, maximum letter let out than etc., but under the condition of Limited Feedback, all be subject to performance loss to a certain degree, as for the performance that reaches expection often needs larger feedback quantity, this is so that existing precoding algorithm is received restriction in actual applications.Simultaneously, the dedicated pilot that the precoding MIMO system must increase each user obtains data with indicating user, and this has increased the system signaling resource overhead.
Summary of the invention
Embodiments of the invention provide a kind of multiple-input and multiple-output MIMO method for precoding, equipment and system, can reduce feedback quantity in the transmission in the phase mutual interference between the user in effective reduction system, improve systematic function.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, provide a kind of multiple-input and multiple-output MIMO data transmission method, comprising:
The first receiving terminal receives the indication information of indication the second code word that transmitting terminal sends and finishes the data channel of precoding according to described the second code word, wherein, described the second code word is that the second receiving terminal is to the code word to described the second receiving terminal interference minimum of described transmitting terminal feedback;
Described the first receiving terminal is according to the described indication information that the receives described data channel of decoding, to obtain data message.
On the one hand, provide a kind of multiple-input and multiple-output MIMO data transmission method, comprising:
The second receiving terminal calculates in the code book described the second receiving terminal is disturbed the second minimum code word;
Described the second receiving terminal will indicate the indication information of described the second code word to feed back to transmitting terminal.
On the one hand, provide a kind of multiple-input and multiple-output MIMO data transmission method, comprising:
Transmitting terminal receives the indication information of indication second code word of the second receiving terminal feedback, and wherein, described the second code word is that described the second receiving terminal is disturbed minimum code word;
Described transmitting terminal it is believed that according to described the second code word logarithm and carries out precoding;
Described transmitting terminal sends the indication information of indicating described the second code word and the data channel of finishing precoding according to described the second code word to the first receiving terminal, so that described the first receiving terminal is decoded to described data channel according to the described indication information that receives, obtain data message.
On the other hand, provide a kind of receiving device, comprising:
Receiving element, be used for to receive the indication information of indication the second code word that transmitting end equipment sends and finish the data channel of precoding according to described the second code word, wherein, described the second code word is that the second receiving device is to the code word to described the second receiving device interference minimum of described transmitting end equipment feedback;
Decoding unit is for the described data channel of decoding according to the described indication information of described receiving element reception, to obtain data message.
On the other hand, provide a kind of receiving device, comprising:
Computing unit is used for calculating code book described the second receiving device is disturbed the second minimum code word;
Feedback unit is used for indicating the indication information of described the second code word to feed back to transmitting end equipment.
On the other hand, provide a kind of transmitting end equipment, comprising:
Receiving element, for the indication information of indication the second code word that receives the second receiving device feedback, wherein, described the second code word is that described the second receiving terminal is disturbed minimum code word;
Coding unit carries out precoding for it is believed that according to described the second code word logarithm;
Transmitting element, be used for sending the indication information of described the second code word of described indication and finishing the data channel of precoding according to described the second code word to the first receiving device, so that described the first receiving device is decoded to described data channel according to the described indication information that receives, obtain data message.
On the other hand, provide a kind of system, comprising:
The first above-mentioned receiving device, the second above-mentioned receiving device and above-mentioned transmitting end equipment.
MIMO data transmission method, equipment and system that the embodiment of the invention provides, receiving device is calculated the code word to the self-interference minimum, will indicate the indication information of this code word to feed back to transmitting end equipment; Transmitting end equipment receives and according to this code word data channel is carried out precoding afterwards; And issue alternately with code word by the data channel of two receiving device code words precoding, receiving device is decoded to data channel according to code word after receiving, to obtain data message.Like this, because receiving device uses each other the code word of the interference minimum of another receiving device is decoded, the signal to another receiving device when having reduced decoding disturbs; Transmitting end equipment also no longer needs to calculate the pre-coding matrix of each receiving device simultaneously, but indicates by code word in the code book, has significantly simplified calculating.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The MIMO data transmission method schematic flow sheet that Fig. 1 provides for the embodiment of the invention;
Another MIMO data transmission method schematic flow sheet that Fig. 2 provides for the embodiment of the invention;
The another MIMO multiple input multiple output data transmission method schematic flow sheet that Fig. 3 provides for the embodiment of the invention;
The again MIMO multiple input multiple output data transmission method schematic flow sheet that Fig. 4 provides for the embodiment of the invention;
The structural representation of the first receiving device that Fig. 5 provides for the embodiment of the invention;
The structural representation of another the first receiving device that Fig. 6 provides for the embodiment of the invention;
The structural representation of the second receiving device that Fig. 7 provides for the embodiment of the invention;
The structural representation of the transmitting end equipment that Fig. 8 provides for the embodiment of the invention;
The structural representation of another transmitting end equipment that Fig. 9 provides for the embodiment of the invention;
The structural representation of the system that Figure 10 provides for the embodiment of the invention;
The structural representation of another system that Figure 11 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The MIMO multiple input multiple output data transmission method that the embodiment of the invention provides, as shown in Figure 1, the method step comprises:
S101, the first receiving terminal receive the indication information of indication the second code word that transmitting terminal sends and finish the data channel of precoding according to the second code word, and wherein, the second code word is that the second receiving terminal disturbs minimum code word to the transmitting terminal feedback to the second receiving terminal.
Need to prove that the second receiving terminal is by block diagonalization algorithm in the Limited Feedback, calculate respectively all code words that code book comprises to the second receiving terminal capacitance loss, obtain the code word of capacitance loss maximum as the second receiving terminal is disturbed the second minimum code word; Perhaps, the second receiving terminal also can be by zero forcing algorithm in the Limited Feedback, calculates respectively all code words that code book comprises the second receiving terminal is disturbed, and the code word that obtains disturbing minimum is as the second code word etc.
Need to prove, code book can be stored in transmitting terminal and receiving terminal, and being stored in transmitting terminal is the same with receiving terminal, code word in the code book and the position of code word all are set to identical, because the capacity of code book all is limited, so the number of codewords in the code book also is limited, receiving terminal is based on algorithms of different, find code word to the self-interference minimum with different references, can use the block diagonalization algorithm to calculate respectively all code words that code book comprises to the second receiving terminal capacitance loss such as the second receiving terminal, with the code word of capacitance loss maximum as the second receiving terminal is disturbed minimum code word.
The data channel that S102, the first receiving terminal receive according to the indication information decoding that receives is to obtain data message.
Need to prove, the first receiving terminal can be different according to indication information, obtain the second code word of indication information indicating by corresponding mode, when being the sequence number of the second code word in code book such as indication information, can obtain this second code word by searching sequence number corresponding in the code book of knowing altogether, and then the data channel of the precoding that receives by this codeword decoding, transmitting terminal is finished with the second code word, thereby obtain data message.
It is worthy of note, the embodiment of the invention take this receiving terminal as the first receiving terminal, another receiving terminal is the example explanation as the second receiving terminal, present embodiment with the first receiving terminal for example simultaneously, the second receiving terminal is also carried out identical operation, but what the second receiving terminal received is the indication information of indication first code word of the first receiving terminal, only illustration explanation is not done any restriction with this herein.
Further, when the use of the first receiving terminal disturbs minimum code word to decode to the second receiving terminal, interference reduction to the signal of the second receiving terminal, make more convergence actual value of data that the second receiving terminal decodes, and meanwhile, when the second receiving terminal disturbs minimum code word to decode in use to the first receiving terminal, also minimum on the impact of the first receiving terminal.
The MIMO data transmission method that the embodiment of the invention provides, receiving device is calculated the code word to the self-interference minimum, will indicate the indication information of this code word to feed back to transmitting end equipment; Transmitting end equipment receives and according to this code word data channel is carried out precoding afterwards; And issue alternately with code word by the data channel of two receiving device code words precoding, receiving device is decoded to data channel according to code word after receiving, to obtain data message.Like this, because receiving device uses each other the code word of the interference minimum of another receiving device is decoded, the signal to another receiving device when having reduced decoding disturbs; Transmitting end equipment also no longer needs to calculate the pre-coding matrix of each receiving device simultaneously, but indicates by code word in the code book, has significantly simplified calculating.
The MIMO multiple input multiple output data transmission method that another embodiment of the present invention provides, as shown in Figure 2, the method step comprises:
S201, the second receiving terminal calculate in the code book the second receiving terminal are disturbed the second minimum code word.
Exemplary, the base station can send public guide frequency to the subscriber equipment that covers, the second receiving terminal can obtain this equipment for the down channel state of base station according to this pilot signal, and in the code book of selecting to reserve in advance according to channel condition information this subscriber equipment is disturbed the first minimum code word.
S202, the second receiving terminal will indicate the indication information of the second code word to feed back to transmitting terminal.
It is worthy of note, the second receiving terminal will be indicated oneself disturbing the indication information of minimum code word to feed back to transmitting terminal, and no longer as prior art, to add up optimum angle channel condition information is sent to transmitting terminal, and reduced system resource overhead, reduce feedback quantity.
Further, the second receiving terminal will indicate the indication information of the second code word to feed back to transmitting terminal, so that it is believed that, the second code word logarithm that transmitting terminal obtains according to this Indication message carries out precoding, and then so that the first receiving terminal when using this codeword decoding data channel the interference to the second receiving terminal minimum, in like manner, the second receiving terminal is during according to the first codeword decoding data channel, and is also minimum to the interference of the first receiving terminal.
The MIMO data transmission method that the embodiment of the invention provides, receiving device is calculated the code word to the self-interference minimum, will indicate the indication information of this code word to feed back to transmitting end equipment; Transmitting end equipment receives and according to this code word data channel is carried out precoding afterwards; And issue alternately with code word by the data channel of two receiving device code words precoding, receiving device is decoded to data channel according to code word after receiving, to obtain data message.Like this, because receiving device uses each other the code word of the interference minimum of another receiving device is decoded, the signal to another receiving device when having reduced decoding disturbs; Transmitting end equipment also no longer needs to calculate the pre-coding matrix of each receiving device simultaneously, but indicates by code word in the code book, has significantly simplified calculating.
The MIMO multiple input multiple output data transmission method that further embodiment of this invention provides, as shown in Figure 3, the method step comprises:
S301, transmitting terminal receive the indication information of indication second code word of the second receiving terminal feedback, and wherein, the second code word is that the second receiving terminal is disturbed minimum code word.
Further, the second code word of indication information indication is in the code book that calculates of the second receiving terminal the second receiving terminal to be disturbed minimum code word.
S302, transmitting terminal it is believed that according to the second code word logarithm and carry out precoding.
Need to prove, transmitting terminal obtains the second code word according to the indication information of feedback, recycles this code word and carries out precoding, carries out precoding with transmitting terminal in the prior art according to channel condition information and compares, computation complexity declines to a great extent, and has improved the calculated performance of transmitting terminal.
S303, transmitting terminal send the indication information of indication the second code word and finish the data channel of precoding according to the second code word to the first receiving terminal, so that the first receiving terminal is decoded to data channel according to the indication information that receives, obtain data message.
Further, transmitting terminal sends the data channel that the second receiving terminal is indicated the indication information of the second code word and finished precoding according to the second code word to the first receiving terminal, so that the first receiving terminal decodes according to the indication information of indication the second code word of obtaining and according to the data channel that the second code word is finished precoding, to obtain data message; Send the first receiving terminal to the second receiving terminal and indicate the indication information of the first code word and finish the data channel of precoding according to the first code word, so that the second receiving terminal decodes to obtain data message according to the indication information of indication the first code word that obtains and according to the data channel that the first code word is finished precoding.
The MIMO data transmission method that the embodiment of the invention provides, receiving device is calculated the code word to the self-interference minimum, will indicate the indication information of this code word to feed back to transmitting end equipment; Transmitting end equipment receives and according to this code word data channel is carried out precoding afterwards; And issue alternately with code word by the data channel of two receiving device code words precoding, receiving device is decoded to data channel according to code word after receiving, to obtain data message.Like this, because receiving device uses each other the code word of the interference minimum of another receiving device is decoded, the signal to another receiving device when having reduced decoding disturbs; Transmitting end equipment also no longer needs to calculate the pre-coding matrix of each receiving device simultaneously, but indicates by code word in the code book, has significantly simplified calculating.
The MIMO data transmission method that yet another embodiment of the invention provides, take receiving terminal as subscriber equipment, transmitting terminal is that the base station is the example explanation, but does not do any restriction with this, as shown in Figure 4, the method step comprises:
S401, first user equipment calculate the code word of in the code book first user equipment being disturbed minimum according to measuring with the base station down channel condition information.
Further, first user equipment uses Limited Feedback block diagonalization algorithm, by calculating the capacity expectation of each code word, estimates the self-interference minimum with the capacity maximum, so can pass through following algorithm, obtains the code word to the self-interference minimum.
Exemplary, suppose that the base station end has transmitting antenna Nt, each subscriber equipment has reception antenna Nr, and wherein, the channel matrix of k subscriber equipment is H
k, its pre-coding matrix is V
kUnder perfect CSI (Channel State Information, channel condition information), the desirable channel capacity of each subscriber equipment is C
CSIT-BD(P), the channel capacity of each subscriber equipment of Limited Feedback BD algorithm is C
LFBD(P), definition
P is transmitting power, I
NrBe the unit matrix of Nr * Nr,
Be k user's being interfered in the practical application pre-coding matrix,
Further, the capacitance loss [C that is brought by feedback error so
Loss-BD(p)] desired value is:
Here
Be channel matrix H
kThe orthonormal basis of row space.Limited Feedback BD algorithm utilizes formula (1) inequality d to calculate the situation of capacitance loss maximum, and as the foundation of codebook selecting.
Formula (2) mainly is that inequality d in the formula (1) provides string between channel matrix and feedback code apart from D.
Present embodiment all is subject to a certain degree performance loss for the precoding algorithm under the condition of Limited Feedback, propose a kind of greedy pre-coding scheme of Limited Feedback of selecting the code word of self-interference minimum.
In the prior art, the expression formula with two users' equipment MIMO precoding in MUMIMO (Multiuser Multiple-Input Multiple-Out-put, multi-user installation multiple-input and multiple-output) is as follows:
Wherein, y
1And y
2Represent respectively the information that first user and the second user receive, x
1And x
2Represent respectively the signal that first user and the second user receive, n
1And n
2Represent respectively interference and noise that first user and the second user receive, the equivalent channels matrix after the precoding is:
The upper left corner and the lower right corner represent respectively the channel matrix of first user and the second user capacity in formula (4) matrix, be the bigger the better, and the lower left corner and the upper right corner represent respectively the channel matrix that first user and the second user are interfered, the smaller the better, prior art is based on the channel matrix of capacity, therefore can't guarantee that the channel matrix that disturbs is less, and the present invention is based on the channel matrix of interference, choose and disturb minimum code word, and in multi-user's scheduling, select two users of mutual capacity gain maximum to come the channel matrix of guaranteed capacity larger.
As, this greedy pre-coding scheme passes through subscriber equipment, select one to the minimum feedback code of oneself interference such as first user equipment, send to the base station, because the base station sends to another subscriber equipment, such as the second subscriber equipment, so that the second subscriber equipment uses this code word to calculate pre-coding matrix, so, the second subscriber equipment is reduced to minimum to the interference of first user equipment.Following formula (5) is take the second subscriber equipment as example, the second subscriber equipment is selected to disturb minimum code word to provide the code word of follow-up pre-coding matrix for first user equipment to own according to own current channel information, utilizes inequality c selection in the formula (1) to the code word of self-interference minimum:
Need to prove, minimum according to the interference that formula (5) calculates, bring in the formula (1), formula (5) is as minuend, get minimum value, cause value maximum in (1), although herein owing to disturb the minimum capacitance loss that obtains maximum, but when having a plurality of receiving terminal, can mutually issue code word and compensate the capacitance loss here according to the data channel of code word precoding by dispatching two maximum receiving terminals of gain.
It is worthy of note, the capacity of code book is a definite value generally speaking, so the number of code word is limited in the code book, can obtain this with reference to different parameters to the code word of self-interference minimum by different algorithms such as block diagonalization, zero forcing algorithm etc., utilize capacity to obtain greatly code word such as block diagonalization, and zero forcing algorithm can be directly according to disturbing minimum of computation to obtain code word, and present embodiment only illustrates with the situation of block diagonalization, does not do any restriction with this.
S402, first user equipment indicate the indication information of the first code word to base station feedback, and this indication information is that first user equipment is disturbed the minimum sequence number of code word in code book.
, because first user equipment is indicated the first code word to the base station feedback indication information, and no longer as prior art, to add up optimum angle channel condition information is sent to transmitting terminal herein, reduced system resource overhead, reduce feedback quantity.
S403, base station receive the indication information that two above subscriber equipmenies send, and corresponding indication is to the code word of the interference minimum of each subscriber equipment in the indication information.
Exemplary, comprise the indication information etc. that the second subscriber equipment is disturbed the second minimum code word in the indication information that the base station receives, and the indication information that other subscriber equipmenies is disturbed minimum code word.
The sequence number inquiry in code book obtains code word according to code word for S404, base station, and uses this code word that data channel is carried out precoding.
Need to prove, the base station uses code word to carry out precoding, and no longer carries out precoding according to channel condition information as prior art, and so the computation complexity of base station declines to a great extent, also corresponding increase of precoding ability for a plurality of subscriber equipmenies has improved the performance of base station.
Need to prove, when the base station receives only the codewords indexes that two subscriber equipmenies send, execution in step S406, and when the base station receives the codewords indexes of three, three even more subscriber equipment transmission, execution in step S405.
S405, base station are calculated by scheduling and are dispatched to two first user equipment and the second subscriber equipmenies in the above subscriber equipment.
Further, the base station is calculated and can be carried out best performance each other based on code word the scheduling of subscriber equipment, specifically, the base station is according to the second subscriber equipment, calculate the pre-coding matrix that compares other subscriber equipmenies and the second subscriber equipment by scheduling, coding gain is maximum between the first user equipment that obtains and the second subscriber equipment, illustrate that with this gain between first user equipment and the second subscriber equipment is maximum, namely use the other side's codeword coding, decoding performance optimum between first user equipment and the second subscriber equipment.
S406, base station send the second subscriber equipment to first user equipment and indicate the indication information of the second code word and finish the data channel of precoding according to the second code word, send the data channel that first user equipment is indicated the indication information of the first code word and finished precoding according to the first code word to the second subscriber equipment.
It is worthy of note, because the code book of the second subscriber equipment is known altogether for first user equipment, the code book of first user equipment is also known altogether concerning the second subscriber equipment, as long as know the code book that code word is total in subscriber equipment and base station, and obtain about choosing the Indication message of code word in the code book, such as the sequence number of code word on code book, just can correspondence find out code word, and the base station no longer needs to send to them the precoding mode of dedicated pilot explanation base station, so, reduced overhead in the process of transfer of data.
S407, first user equipment receive the indication information of the second subscriber equipment the second code word that the base station sends and finish the data channel of precoding according to the second code word.
S408, first user equipment obtain the second subscriber equipment is disturbed the second minimum code word by the sequence number of inquiry the second code word in code book in code book.
What the second codeword decoding that S409, the use of first user equipment obtain received carries out the coded data channel according to the second code word, to obtain data message.
It is worthy of note, because using, first user equipment disturb minimum code word to decode to the second subscriber equipment, interference reduction to the signal of the second subscriber equipment, the outer signals impact that is subject to during such the second subscriber equipment decoding is minimum, thereby the data that assurance decodes are the convergence actual value more, simultaneously, because the second subscriber equipment is using the code word to first user equipment interference minimum to decode, so the signal that is subject to during the first user device decodes disturbs also minimum, also can guarantee more convergence actual value of the data that decode.
First user description of equipment workflow is only used in this enforcement, and other subscriber equipment is also carried out same step, all receives the Indication message that another subscriber equipment is disturbed minimum code word, and decodes according to this Indication message, does not repeat them here.
The MIMO data transmission method that the embodiment of the invention provides, receiving device is calculated the code word to the self-interference minimum, will indicate the indication information of this code word to feed back to transmitting end equipment; Transmitting end equipment receives and according to this code word data channel is carried out precoding afterwards; And issue alternately with code word by the data channel of two receiving device code words precoding, receiving device is decoded to data channel according to code word after receiving, to obtain data message.Like this, because receiving device uses each other the code word of the interference minimum of another receiving device is decoded, the signal to another receiving device when having reduced decoding disturbs; Transmitting end equipment also no longer needs to calculate the pre-coding matrix of each receiving device simultaneously, but indicates by code word in the code book, has significantly simplified calculating.
The first receiving device 40 that the embodiment of the invention provides as shown in Figure 5, comprising:
Receiving element 401, be used for to receive the indication information of indication the second code word that transmitting end equipment 60 sends and finish the data channel of precoding according to the second code word, wherein, the second code word is that the second receiving device 50 is to the code word to the second receiving device 50 interference minimums of transmitting end equipment 60 feedbacks.
Decoding unit 402 is used for the indication information decoded data channel according to indication second code word of receiving element 401 receptions, to obtain data message.
It is worthy of note, because decoding unit 402 uses the second codeword decoding of the second receiving device 50 to finish the data channel of precoding according to the second code word, simultaneously, the decoding unit of the second receiving device 50 also uses the first code word of the first receiving device 40 that the data channel of finishing precoding according to the first code word is decoded, so the interference between two receiving devices is minimum.
Further, as shown in Figure 6, the first receiving device 40 also comprises:
The method that the first receiving device 40 can use above-described embodiment to provide is carried out work, and method of work is identical with the method that embodiment provides, and does not repeat them here.
The receiving device that the embodiment of the invention provides, receiving device are calculated the code word to the self-interference minimum, will indicate the indication information of this code word to feed back to transmitting end equipment; Transmitting end equipment receives and according to this code word data channel is carried out precoding afterwards; And issue alternately with code word by the data channel of two receiving device code words precoding, receiving device is decoded to data channel according to code word after receiving, to obtain data message.Like this, because receiving device uses each other the code word of the interference minimum of another receiving device is decoded, the signal to another receiving device when having reduced decoding disturbs; Transmitting end equipment also no longer needs to calculate the pre-coding matrix of each receiving device simultaneously, but indicates by code word in the code book, has significantly simplified calculating.
The second receiving device 50 that the embodiment of the invention provides as shown in Figure 7, comprising:
Further, computing unit 501 is used for obtaining code word to the self-interference minimum by Limited Feedback block diagonalization algorithm, wherein, to the self-interference minimum by to cardinality loss max calculation in the code book out.
Exemplary, indication information can be the sequence number of the second code word in code book.
The method that the second receiving device 50 can use above-described embodiment to provide is carried out work, and method of work is identical with the method that embodiment provides, and does not repeat them here.
The receiving device that the embodiment of the invention provides, receiving device are calculated the code word to the self-interference minimum, will indicate the indication information of this code word to feed back to transmitting end equipment; Transmitting end equipment receives and according to this code word data channel is carried out precoding afterwards; And issue alternately with code word by the data channel of two receiving device code words precoding, receiving device is decoded to data channel according to code word after receiving, to obtain data message.Like this, because receiving device uses each other the code word of the interference minimum of another receiving device is decoded, the signal to another receiving device when having reduced decoding disturbs; Transmitting end equipment also no longer needs to calculate the pre-coding matrix of each receiving device simultaneously, but indicates by code word in the code book, has significantly simplified calculating.
The transmitting end equipment 60 that the embodiment of the invention provides as shown in Figure 8, comprising:
Receiving element 601, for the indication information of indication the second code word that receives the second receiving device 50 feedbacks, wherein, the second code word is that the second receiving device 50 is disturbed minimum code word.
Need to prove, calculate the method for minimum code word and in said method embodiment, describe in detail, do not repeat them here.
Transmitting element 603, be used for sending the indication information of indicating the second code word and the data channel of finishing precoding according to the second code word to the first receiving device 40, so that the first receiving device 40 is decoded to data channel according to the indication information that receives, obtain data message.
Further, transmitting element 603, also be used for sending the indication information of the first receiving device 40 indications the first code word and according to the first code word data channel being carried out precoding to the second receiving device 50, so that the second receiving device 50 is according to the first code word that obtains and carry out encoded data channels according to the first code word and decode to obtain data message.
Exemplary, as shown in Figure 9, transmitting end equipment 60 also comprises: scheduling unit 604, processing unit 605.
Further, if the indication information that receiving element 601 receives is the sequence number of the second code word in code book, processing unit 605 is used for obtaining the second code word according to the second code word of feedback at the sequence number of code book, carries out precoding so that coding unit 602 uses the second code word logarithm it is believed that.
Need to prove, in the transmitting end equipment 60 scheduling unit 604 and processing unit 605 can be set separately, or scheduling unit 604 and processing unit 605 are set simultaneously, Fig. 8 has only enumerated a kind of situation, but does not do any restriction.
The method that this transmitting end equipment 60 can use above-described embodiment to provide is carried out work, and method of work is identical with the method that embodiment provides, and does not repeat them here.
The equipment 60 of the transmission that the embodiment of the invention provides receives the indication information of being calculated this code word of indication that the code word of self-interference minimum is also fed back by receiving device; According to this code word data channel is carried out precoding; And issue alternately with code word by the data channel of two receiving device code words precoding, receiving device is decoded to data channel according to code word after receiving, to obtain data message.Like this, because receiving device uses each other the code word of the interference minimum of another receiving device is decoded, the signal to another receiving device when having reduced decoding disturbs; Transmitting end equipment also no longer needs to calculate the pre-coding matrix of each receiving device simultaneously, but indicates by code word in the code book, has significantly simplified calculating.
The system that the embodiment of the invention provides as shown in figure 10, comprising:
Transmitting end equipment 60 is used for the indication information that reception the first receiving device 40 and the second receiving device 50 feed back; Indication information according to feedback carries out precoding to data channel; Send the indication information of the second code word and finish the data channel of precoding according to the second code word to the first receiving device 40, wherein, the second code word is that the second receiving device 50 is to the code word to the second receiving device 50 interference minimums of transmitting end equipment 60 feedbacks; Send the indication information of the first code word and finish the data channel of precoding according to the first code word to the second receiving device 50, wherein, the first code word is that the first receiving device 40 is to the code word to the first receiving device 40 interference minimums of transmitting end equipment 60 feedbacks.
The first receiving device 40 be used for to receive the indication information of indication the second code word that transmitting end equipment 60 sends and finishes the data channel of precoding according to the second code word, according to the indication information decoded data channel that receives, to obtain data message;
The second receiving device 50 be used for to receive the indication information of indication the first code word that transmitting end equipment 60 sends and finishes the data channel of precoding according to the first code word, according to the indication information decoded data channel that receives, to obtain data message.
Further, as shown in figure 11, in system except the second receiving device 50, when also having more than two other receiving device 70, be the first receiving device 40 with the maximum receiving device of described the second receiving device 50 gains in two above receiving devices of transmitting end equipment 60 scheduling.
Above-mentioned the first receiving device 40, the second receiving device 50 and transmitting end equipment 60 corresponding said method embodiment, this first receiving device 40, the second receiving device 50 and transmitting end equipment 60 can be used for the step of said method embodiment, and the application in its concrete each step can be with reference to said method embodiment.The receiving device that provides in the concrete structure of the first receiving device 40, the second receiving device 50 and transmitting end equipment 60 and above-described embodiment is identical with the structure of transmitting end equipment, does not repeat them here.
The system that the embodiment of the invention provides receives the indication information of being calculated this code word of indication that the code word of self-interference minimum is also fed back by receiving device; According to this code word data channel is carried out precoding; And issue alternately with code word by the data channel of two receiving device code words precoding, receiving device is decoded to data channel according to code word after receiving, to obtain data message.Like this, because receiving device uses each other the code word of the interference minimum of another receiving device is decoded, the signal to another receiving device when having reduced decoding disturbs; Transmitting end equipment also no longer needs to calculate the pre-coding matrix of each receiving device simultaneously, but indicates by code word in the code book, has significantly simplified calculating.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The above; be the specific embodiment of the present invention only, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (18)
1. a multiple-input and multiple-output MIMO data transmission method is characterized in that, comprising:
The first receiving terminal receives the indication information of indication the second code word that transmitting terminal sends and finishes the data channel of precoding according to described the second code word, wherein, described the second code word is that the second receiving terminal is to the code word to described the second receiving terminal interference minimum of described transmitting terminal feedback;
Described the first receiving terminal is according to the described indication information that the receives described data channel of decoding, to obtain data message.
2. method according to claim 1 is characterized in that,
Described indication information is the sequence number of described the second code word in code book.
3. method according to claim 2 is characterized in that, described the first receiving terminal comprises according to the described indication information that the receives described data channel of decoding:
Described the first receiving terminal obtains described the second code word according to the sequence number of the second code word in described code book;
According to the described data channel of described the second codeword decoding.
4. a multiple-input and multiple-output MIMO data transmission method is characterized in that, comprising:
The second receiving terminal calculates in the code book described the second receiving terminal is disturbed the second minimum code word;
Described the second receiving terminal will indicate the indication information of described the second code word to feed back to transmitting terminal.
5. method according to claim 4 is characterized in that, described the second receiving terminal calculates in the code book and disturbs the second minimum code word to comprise to described the second receiving terminal:
Described the second receiving terminal utilizes following formula to calculate respectively all code word c that code book C comprises, and obtains described the second receiving terminal is disturbed minimum described the second code word c
2:
Wherein, c ∈ C indication code word c belongs to code book C, I
NrBe the unit matrix of Nr * Nr, Nr is the number of receiving terminal reception antenna, and P is transmitting power, N
tBe the number of transmitting terminal transmitting antenna, H
2Be the channel matrix of the second receiving terminal, c
HBe the conjugate transpose of described code word c,
It is the conjugate transpose of the second receiving terminal channel matrix.
6. a multiple-input and multiple-output MIMO data transmission method is characterized in that, comprising:
Transmitting terminal receives the indication information of indication second code word of the second receiving terminal feedback, and wherein, described the second code word is that described the second receiving terminal is disturbed minimum code word;
Described transmitting terminal it is believed that according to described the second code word logarithm and carries out precoding;
Described transmitting terminal sends the indication information of indicating described the second code word and the data channel of finishing precoding according to described the second code word to the first receiving terminal, so that described the first receiving terminal is decoded to described data channel according to the described indication information that receives, obtain data message.
7. method according to claim 6 is characterized in that,
Described transmitting terminal receives outside the indication information of the second receiving terminal feedback, also receives the indication information of at least two receiving terminal feedbacks, and wherein, described indication information indication is disturbed minimum code word to described receiving terminal.
8. method according to claim 7 is characterized in that, described transmitting terminal sends the indication information of described the second code word of indication and finishes before the data channel of precoding according to described the second code word to the first receiving terminal, also comprises:
Receiving terminal with described the second receiving terminal gain maximum in described at least two receiving terminals of described transmitting terminal scheduling is the first receiving terminal.
9. according to claim 6 to 8 arbitrary described methods, it is characterized in that described indication information is the sequence number of described the second code word in code book.
10. method according to claim 6 is characterized in that, described transmitting terminal it is believed that according to described the second code word logarithm and carries out also comprising before the precoding:
Described transmitting terminal obtains described the second code word according to the sequence number of described the second code word in described code book of feedback.
11. a receiving device is characterized in that, comprising:
Receiving element, be used for to receive the indication information of indication the second code word that transmitting end equipment sends and finish the data channel of precoding according to described the second code word, wherein, described the second code word is that the second receiving device is to the code word to described the second receiving device interference minimum of described transmitting end equipment feedback;
Decoding unit is for the described data channel of decoding according to the described indication information of described receiving element reception, to obtain data message.
12. receiving device according to claim 11 is characterized in that, also comprises:
Processing unit, if the described indication information that described receiving element receives is the sequence number of the second code word in code book, be used for obtaining described the second code word according to the second code word at the sequence number of described code book, so that described decoding unit is according to the described data channel of the second codeword decoding, to obtain data message.
13. a receiving device is characterized in that, comprising:
Computing unit is used for calculating code book described the second receiving device is disturbed the second minimum code word;
Feedback unit is used for indicating the indication information of described the second code word to feed back to transmitting end equipment.
14. receiving device according to claim 13 is characterized in that,
Described computing unit, concrete being used for utilizes following formula to calculate respectively all code word c that code book C comprises, and obtains described the second receiving terminal is disturbed minimum described the second code word c
2:
Wherein, c ∈ C indication code word c belongs to code book C, I
NrBe the unit matrix of Nr * Nr, Nr is the number of receiving terminal reception antenna, and P is transmitting power, N
tBe the number of transmitting terminal transmitting antenna, H
2Be the channel matrix of the second receiving terminal, c
HBe the conjugate transpose of described code word c,
It is the conjugate transpose of the second receiving terminal channel matrix.
15. a transmitting end equipment is characterized in that, comprising:
Receiving element, for the indication information of indication the second code word that receives the second receiving device feedback, wherein, described the second code word is that described the second receiving terminal is disturbed minimum code word;
Coding unit carries out precoding for it is believed that according to described the second code word logarithm;
Transmitting element, be used for sending the indication information of described the second code word of described indication and finishing the data channel of precoding according to described the second code word to the first receiving device, so that described the first receiving device is decoded to described data channel according to the described indication information that receives, obtain data message.
16. transmitting end equipment according to claim 15 is characterized in that, also comprises:
Scheduling unit, if receive for described receiving element outside the indication information of the second receiving device feedback, also receive at least two receiving device feedback indication informations, wherein, the indication of described indication information is disturbed minimum code word to described receiving device, and then dispatching in described two receiving devices with the maximum receiving device of described the second receiving device gain at least is the first receiving device.
17. according to claim 15 or 16 described transmitting end equipments, it is characterized in that, also comprise:
Processing unit is that described the second code word is at the sequence number of code book if be used for the described indication information of described receiving element reception; Then the sequence number of described the second code word in described code book according to feedback obtains described the second code word, so that described coding unit uses described the second code word that described data channel is carried out precoding.
18. a system is characterized in that, comprising:
Claim 11 or 12 described the first receiving devices;
Claim 13 or 14 described the second receiving devices;
With each described transmitting end equipment of claim 15-17.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106250241A (en) * | 2016-08-02 | 2016-12-21 | 合肥奇也信息科技有限公司 | A kind of multi-direction distribution data processing system resources is to the method for application program |
| CN106685591A (en) * | 2016-12-09 | 2017-05-17 | 华为技术有限公司 | Data transmission method and data transmission device |
| US10470188B2 (en) | 2014-12-22 | 2019-11-05 | Huawei Technologies Co., Ltd. | Transmission of one or more codebooks between network and terminal devices |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070064829A1 (en) * | 2005-09-21 | 2007-03-22 | Jun Zheng | Method and system for a simplified user group selection scheme with finite-rate channel state information feedback for FDD multiuser MIMO downlink transmission |
| CN101159462A (en) * | 2007-11-01 | 2008-04-09 | 中国科学技术大学 | Limiting feedback precoding interference suppression method of multi-antenna multi-cell system |
| CN101453259A (en) * | 2007-12-03 | 2009-06-10 | 株式会社Ntt都科摩 | Pre-encoded transmission method for MIMO system |
| CN101977098A (en) * | 2010-11-23 | 2011-02-16 | 上海交通大学 | User selection and precoding method in wireless multi-user multi-input/output system |
| US20110065465A1 (en) * | 2009-09-17 | 2011-03-17 | Electronics And Telecommunications Research Institute | Precoding method and apparatus, and precoding control method and apparatus |
| CN102006106A (en) * | 2009-09-02 | 2011-04-06 | 华为技术有限公司 | Service data processing method and device and communication system |
-
2012
- 2012-03-31 CN CN201210092698.5A patent/CN103368698B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070064829A1 (en) * | 2005-09-21 | 2007-03-22 | Jun Zheng | Method and system for a simplified user group selection scheme with finite-rate channel state information feedback for FDD multiuser MIMO downlink transmission |
| CN101159462A (en) * | 2007-11-01 | 2008-04-09 | 中国科学技术大学 | Limiting feedback precoding interference suppression method of multi-antenna multi-cell system |
| CN101453259A (en) * | 2007-12-03 | 2009-06-10 | 株式会社Ntt都科摩 | Pre-encoded transmission method for MIMO system |
| CN102006106A (en) * | 2009-09-02 | 2011-04-06 | 华为技术有限公司 | Service data processing method and device and communication system |
| US20110065465A1 (en) * | 2009-09-17 | 2011-03-17 | Electronics And Telecommunications Research Institute | Precoding method and apparatus, and precoding control method and apparatus |
| CN101977098A (en) * | 2010-11-23 | 2011-02-16 | 上海交通大学 | User selection and precoding method in wireless multi-user multi-input/output system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10470188B2 (en) | 2014-12-22 | 2019-11-05 | Huawei Technologies Co., Ltd. | Transmission of one or more codebooks between network and terminal devices |
| CN106250241A (en) * | 2016-08-02 | 2016-12-21 | 合肥奇也信息科技有限公司 | A kind of multi-direction distribution data processing system resources is to the method for application program |
| CN106685591A (en) * | 2016-12-09 | 2017-05-17 | 华为技术有限公司 | Data transmission method and data transmission device |
| CN106685591B (en) * | 2016-12-09 | 2020-06-02 | 华为技术有限公司 | Data transmission method and equipment |
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