CN105577251B - A kind of degree of freedom optimization method of the incoherent MIMO broadcast channels of two users - Google Patents
A kind of degree of freedom optimization method of the incoherent MIMO broadcast channels of two users Download PDFInfo
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- CN105577251B CN105577251B CN201610061372.4A CN201610061372A CN105577251B CN 105577251 B CN105577251 B CN 105577251B CN 201610061372 A CN201610061372 A CN 201610061372A CN 105577251 B CN105577251 B CN 105577251B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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Abstract
The invention discloses a kind of degree of freedom optimization methods of the incoherent MIMO broadcast channels of two users, including：(1) user big to the period of being concerned with carries out pilot tone training, and the user is made to obtain channel parameter；(2) the base station user big with the relevant period individually communicates；(3) base station sends to fold simultaneously to two users multiplies signal；(4) two users to receive it is folded multiply signal and be decoded respectively, obtain echo signal；Degree of freedom optimization method provided by the invention, the case where for two users being noncoherent communication, the method for multiplying signal is trained plus folded using pilot tone, the user of relevant period length is set first to obtain CouncilforScientificandIndustrialResearch, then base station is carried out at the same time with two users and communicates, and can solve the problems, such as that each time slot in base station can only be communicated with a user in the prior art；And in the case where not changing the degree of freedom of a user, the user of another relevant period length is made to obtain additional degree of freedom；Timesharing strategy compared with the existing technology, is remarkably improved the degree of freedom of system.
Description
Technical field
The invention belongs to the capacity of the incoherent broadcast channel of two users to portray technical field, more particularly, to one kind two
The degree of freedom optimization method of the incoherent MIMO broadcast channels of user.
Background technology
For multiuser MIMO (Multi-Input Multi-Output, multiple-input, multiple-output) broadcast channel, degree of freedom is very
It is decided by the whether known CSI (Channel State Information, channel side information) in sending and receiving end in big degree, works as transmission
End has CSIT (CSI at Transmitter, transmitting terminal channel side information) and receiving terminal has CouncilforScientificandIndustrialResearch (CSI at
Receiver, receiving terminal channel side information) when, the side such as transmitting terminal precoding technique and receiving terminal interference elimination can be passed through
Method allows transmitting terminal to send signal to all users simultaneously.
It is M in antenna for base station number, number of users K, each user antenna number is NiUnder the scene of (1≤i≤K), system energy
The maximum degree of freedom enough obtained isAnd when transmitting terminal does not have CSIT, TDMA (Time Division
Multiple Access, time division multiplexing) it is optimal case, the maximum degree of freedom that system can reach is min (M, maxNi)。
In the communication of point-to-point incoherent mimo channel, CSI is unknown and CSI is kept not in relevant cycle T time slot
In the case of change, the system degree of freedom that each time slot can obtain that is averaged isWherein
Wherein M, N are respectively transmitting-receiving two-end antenna number；
For the MIMO broadcast channels of two users, the case where two use do not know CSI per family, the side TDMA of the prior art
In case, base station is only communicated with a user every time；In the case where user is concerned with period difference, degree of freedom is relatively low.
Invention content
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of incoherent MIMO broadcast of two users
The degree of freedom optimization method of channel, its object is to improve the degree of freedom of offer system.
To achieve the above object, according to one aspect of the present invention, a kind of incoherent MIMO broadcast letter of two users is provided
The degree of freedom optimization method in road, includes the following steps：
(1) user big to the period of being concerned with carries out pilot tone training, and the user is made to obtain channel parameter；
(2) the base station user big with the relevant period individually communicates；
(3) base station sends to fold simultaneously to two users multiplies signal；
(4) two user's receiving terminals folded multiply signal and are decoded respectively to what is received.
Preferably, above-mentioned degree of freedom optimization method, step (1) are specially：In relevant cycle T2First T1In duration
Pilot tone training is carried out to the user for the period length that is concerned with, the user is made to obtain channel parameter, including CouncilforScientificandIndustrialResearch；
Its step (2) is specially：In relevant cycle T2First T1(T in duration1-N2) in duration, base station with it is relevant
User's communication of period length；
Its step (3) is specially：In relevant cycle T2First T1(T after duration2-T1) in duration, base station is sent
It is folded to multiply signal；
Wherein, T1For the relevant period of user 1, T2For the relevant period of user 2, T2=nT1, n is positive integer；N2For user
2 antenna number.
Preferably, in above-mentioned degree of freedom optimization method, pilot tone training process is specific as follows：Use of the base station to the period length that is concerned with
Family sends known pilot frequency sequence, which acquisition letter is compared with the known pilot frequency sequence by the signal received
Road parameter.
Preferably, above-mentioned fold multiplies signalWherein, X1For the echo signal of user 1, X2For user 2
Echo signal,For the power normalization factor.
Preferably, above-mentioned degree of freedom optimization method, by the incoherent MIMO broadcast channels of two users antenna for base station number M with
The antenna number N of the user of relevant period length2It is set as consistent, to enable a system to the degree of freedom reached maximum.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect：
(1) the degree of freedom optimization method of the incoherent MIMO broadcast channels of two users provided by the invention, is trained using pilot tone
Add the folded method for multiplying signal, the user of relevant period length is made first to obtain CouncilforScientificandIndustrialResearch, then base station is carried out at the same time with two users and communicates,
It can solve the problems, such as that each time slot in base station can only be communicated with a user in the prior art；
(2) the degree of freedom optimization method of the incoherent MIMO broadcast channels of two users provided by the invention, can make base station with
Two users are carried out at the same time communication, in the case where not changing the degree of freedom of a user, make the use of another relevant period length
Family obtains additional degree of freedom gain；Accordingly, with respect to the timesharing strategy of the prior art, this method can significantly improve system
Degree of freedom.
Description of the drawings
Fig. 1 is the flow chart for the incoherent MIMO broadcast channels degree of freedom optimization method of two users that embodiment provides；
Fig. 2 is the incoherent MIMO broadcast channels model of two users that embodiment is based on；
Fig. 3 is the relevant cycle T of two users in embodiment1With T2Relational graph；
Fig. 4 is the comparison song that the degree of freedom optimization method that embodiment provides is able to the degree of freedom reached with timesharing strategy
Line.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
The degree of freedom optimization method of the incoherent MIMO broadcast channels of two users provided by the invention, flow as shown in Figure 1,
Include the following steps：
(1) user big to the period of being concerned with carries out pilot tone training, and the user is made to obtain channel parameter；
(2) the base station user big with the relevant period individually communicates；
(3) base station sends to fold simultaneously to two users multiplies signal；
(4) two user's receiving terminals folded multiply signal and are decoded respectively to what is received.
Embodiment is based on model shown in Fig. 2, which is the incoherent MIMO broadcast channels of two users, base station transmission antenna
Number is M, and the reception antenna number of user 1 is N1, the reception antenna number of user 2 is N2；Antenna number meets M=N2；The receipts of two users
Send out the unknown CSI in both ends；
In embodiment, the relevant period of user 1 is T1, T1>=2min (M, max (N1, N2))；The relevant period of user 2 is
T2, T2=nT1；The relevant cycle T of user 11With the relevant cycle T of user 22Relationship it is as shown in Figure 3.
The incoherent MIMO broadcast channels degree of freedom optimization method of two users that embodiment provides, is as follows：
(1) in relevant cycle T2First T1Pilot tone training is carried out to user 2 in duration：Base station sends pilot tone to user 2
Signal makes the receiving terminal of user 2 obtain CouncilforScientificandIndustrialResearch；The pilot tone training process consumes N2A time slot；In (T2-N2) in duration, user 2
Know accurate CouncilforScientificandIndustrialResearch information；
(2) in first T1Remaining (T1-N2) in duration, base station is only communicated with user 2；Point-to-point channel is average
The degree of freedom that each time slot can obtain is N2, the broadcast channel between user 2 and base station is in first T1It is retrievable in duration
Degree of freedom is N2(T1-N2)；
(3) in relevant cycle T2First T1(T after duration2-T1) in duration, base station and user 1 and user 2 are same
Shi Jinhang is communicated；
In each T1In period, the folded of base station transmission multiplies signalWherein X1Believe for the target of user 1
Number, X2For the echo signal of user 2,For the power normalization factor；
In embodiment, 1 unknown CSI of user, therefore the equivalent channel of user 1 is point-to-point noncoherent communication channel, can be obtained
The degree of freedom taken is N1(T1-N1)；
User 1 and user 2 decode X1；Decoding X1X is decoded later2；The degree of freedom that user 2 can obtain is N2N1；With
Family 1 is with user 2 in each T1The degree of freedom that average each time slot in duration obtains to for：Two
User is in (T2-T1) degree of freedom that can reach of average each time slot in duration is to being also
In entire T2In period, total degree of freedom that user 1 can obtain with user 2 to for：
((n-1)N1(T1-N1),(T1-N2)N2+(n-1)N2N1)
In communication time, user 1 and user 2 be averaged degree of freedom that each time slot can reach to for：
Work as M=N1, two users' broadcast channel model that above-described embodiment is based on is equivalent to (N1,N1,N1) model, two
User be averaged degree of freedom that each time slot can reach to forIt can by the formula
Know, M=N1When the degree of freedom that can reach of system it is smaller.
The degree of freedom d of user 22It obtains according to the following formula：
When, d2With N2Increase and increase；It is trained using pilot tone provided by the invention plus folded
When the degree of freedom optimization method multiplied, M=N2, i.e. user reception antenna quantity holding one of the antenna for base station quantity with the period length that is concerned with
It causes, the degree of freedom reached maximum can be enabled the system to.
Timesharing strategy is used using the prior art, degree of freedom obtained by user 1 and user 2 to for：The degree of freedom that average each time slot can obtain is：
Pilot tone training provided in this embodiment plus the folded degree of freedom optimization method multiplied, the degree of freedom that each time slot obtains are：
By degree of freedom that two users can reach to being described with curve, as shown in Figure 4：When using timesharing strategy,
The boundary of degree of freedom is straight line：
Whereind1And d2Respectively user 1 and when each user 2
The degree of freedom that gap can obtain；The degree of freedom obtained using degree of freedom optimization method provided in this embodiment is to meeting：
WhereinRespectively use we
User 1 and user 2 are averaged the degree of freedom that each time slot can reach when method；Work as nN1＞ N2When, than
Compared with for, the degree of freedom that the present embodiment is reached is more than the degree of freedom that timesharing strategy is reached.
As shown in Figure 4, as n increases, the attainable degree of freedom phase of degree of freedom optimization method institute provided in this embodiment
It is more apparent to timesharing dominance of strategies, as n → ∞, it is believed that CouncilforScientificandIndustrialResearch known to user 2；On the other hand, it can be seen that this method
The degree of freedom optimization method of offer can make system obtain the degree of freedom of bigger；As n=5, system can be made using this method
The degree of freedom that average each time slot can reach is to for (0.6,0.6), and timesharing strategy can be such that system each time slot that is averaged obtains
The degree of freedom obtained is d=0.75t+1.8 (1-t)；If the timesharing coefficient of user 1 when orthogonal transmissionIt is carried using the present invention
The degree of freedom optimization method of confession can make the degree of freedom of system acquisition bigger.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (4)
1. a kind of degree of freedom optimization method of the incoherent MIMO broadcast channels of two users, which is characterized in that include the following steps：
(1) user big to the period of being concerned with carries out pilot tone training, and the user is made to obtain channel parameter；
(2) the base station user big with the relevant period individually communicates；
(3) base station sends to fold simultaneously to two users multiplies signal；
(4) two users to receive it is folded multiply signal and be decoded respectively, obtain echo signal；
The step (1) is specially：In relevant cycle T2First T1Pilot tone instruction is carried out to the user for the period length that is concerned in duration
Practice；
The step (2) is specially：In relevant cycle T2First T1(T in duration1-N2) in duration, base station and relevant week
User's communication of phase length；
The step (3) is specially：In relevant cycle T2First T1(T after duration2-T1) in duration, base station sends folded
Multiply signal；
Wherein, T1For the relevant period of user 1, T2For the relevant period of user 2, T2=nT1, n is positive integer；N2For user's 2
Antenna number.
2. degree of freedom optimization method as described in claim 1, which is characterized in that the pilot tone training process is specific as follows：
Base station sends known pilot frequency sequence to the user for the period length that is concerned with, the user by the signal that receives with it is described
Acquisition channel parameter is compared in the pilot frequency sequence known.
3. degree of freedom optimization method as claimed in claim 1 or 2, which is characterized in that described fold multiplies signal
Wherein, X1For the echo signal of user 1, X2For the echo signal of user 2,For the power normalization factor, N1For with
The reception antenna number at family 1.
4. degree of freedom optimization method as claimed in claim 1 or 2, which is characterized in that by the incoherent MIMO broadcast letter of two users
The antenna number N of antenna for base station number M and the user of length of relevant period in road2It is set as consistent, to enable a system to the freedom reached
Degree is maximum.
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| CN106059637A (en) * | 2016-05-31 | 2016-10-26 | 华中科技大学 | Degree of freedom optimization method for multi-user MIMO (Multi-input Multi-output) broadcast channel under mixed CSI (Channel State Information) |
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|---|---|---|---|---|
| CN102301821A (en) * | 2009-04-28 | 2011-12-28 | 上海贝尔股份有限公司 | Method and device for non-coherent multi-station multi-user joint transmission |
| WO2012152064A1 (en) * | 2011-05-06 | 2012-11-15 | The Hong Kong University Of Science And Technology | Dynamic interference alignment for partially connected quasi-static mimo interference channel |
| CN105024786A (en) * | 2015-06-05 | 2015-11-04 | 华中科技大学 | A freedom degree optimization method for multi-user MIMO broadcast channels under a condition of mixed CSI |
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Patent Citations (3)
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|---|---|---|---|---|
| CN102301821A (en) * | 2009-04-28 | 2011-12-28 | 上海贝尔股份有限公司 | Method and device for non-coherent multi-station multi-user joint transmission |
| WO2012152064A1 (en) * | 2011-05-06 | 2012-11-15 | The Hong Kong University Of Science And Technology | Dynamic interference alignment for partially connected quasi-static mimo interference channel |
| CN105024786A (en) * | 2015-06-05 | 2015-11-04 | 华中科技大学 | A freedom degree optimization method for multi-user MIMO broadcast channels under a condition of mixed CSI |
Non-Patent Citations (5)
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| Broadcast Channel: Degrees of Freedom with no CSIR;Umer Salim etc.;《Communication, Control, and Computing, 2008 46th Annual Allerton Conference on》;20080926;全文 * |
| On the Degrees of Freedom Region of General MIMO Broadcast Channel with Mixed CSIT;Bo Yang etc.;《Information Theory Proceeding(ISIT),2013 IEEE International Symposium on》;20130712;全文 * |
| Outer Bounds of Spatial Degrees of Freedom for MIMO Interference Channel without CSIT and with only Local CSIT;Shixin Peng etc.;《TENCON Spring Conference, 2013 IEEE》;20130419;全文 * |
| The Degrees of Freedom Region of the Two-User MIMO Broadcast Channel with Delayed CSIT;Chinmay S.Vaze;《IEEE Transaction on Information Theoty》;20131105;全文 * |
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