CN102067475B - The method that Open-Loop Spatial Multiplexing is carried out using precoding decorrelation - Google Patents
The method that Open-Loop Spatial Multiplexing is carried out using precoding decorrelation Download PDFInfo
- Publication number
- CN102067475B CN102067475B CN200880129940.3A CN200880129940A CN102067475B CN 102067475 B CN102067475 B CN 102067475B CN 200880129940 A CN200880129940 A CN 200880129940A CN 102067475 B CN102067475 B CN 102067475B
- Authority
- CN
- China
- Prior art keywords
- channel
- mimo
- precoding
- matrix
- coding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- H04B7/0697—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 spatial multiplexing
-
- 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
- H04B7/0426—Power distribution
- H04B7/0434—Power distribution using multiple eigenmodes
Abstract
The present invention proposes the method for carrying out Open-Loop Spatial Multiplexing using precoding decorrelation.H is the channel transfer matrices of mimo system so that matrix det (H ' H) is maximum, to allow Open-Loop Spatial Multiplexing system to realize maximum capacity；So that each layer signal intensity of mimo system is equal and orthogonal, i.e., so that the channel transfer matrices of MIMO are orthogonal diagonal matrixes；In precoding MIMO, the equivalent mimo channel corresponding with specific pre-coding matrix E can be by applying HE=HE is reconstructing.Precoding can farthest weaken the impact of channel relevancy in space multiplexing system, and UE can very well use demultiplexing and detection signal, which greatly improves E MBMS transmission qualities, do not introduce any additional complexity in addition；Open loop MIMO suitable for MBSFN.
Description
Technical field
The present invention relates to MIMO fields, in particular it relates to a kind of decorrelation of utilization precoding carries out Open-Loop Spatial Multiplexing
Method.
Background technology
Single Frequency Network (SFN) operation can be used for using the broadcast/multi broadcast of OFDM transmission to communicate from multiple cells, in the cycle
Property prefix length in have timing error.When there is SFN operations, broadcast SINR can be very for less cell configuration
It is high.
It is contemplated that LTE system will be used for unicast communication using some form of MIMO technology.When multi-emitting and reception
When antenna and multi-emitting and reception chain are available, for the benefit that E-MBMS is also adopted by MIMO is logical.However,
Key difference between unicast and broadcast is that only " open loop " MIMO technology can be used for E-MBMS.This includes some form of
Penetrate " open loop " spatial reuse of diversity or multiple streams.
But for Open-Loop Spatial Multiplexing, it has strict restriction for the multicast in correlated channels.When UE is leaned on very much
During a nearly eNB, the power ratio received from the base station is much better than from the power that other base stations receive.In addition, the eNB two
Transmitting antenna all has the directapath for reaching UE receiver antennas, and the channel is typical Rician or that sight line
(LOS) channel.In this case, channel response vector is strong correlation.Because being Open-Loop Spatial Multiplexing, it is not possible to be based on
Feedback information obtains the quadrature compensation from transmitter.As a result it is that UE no longer can be demultiplexed to the two symbols.
There are several schemes that can improve LOS user performances.The first scheme and be simplest scheme in difference
Polarization under launch different streams.Therefore, the UE reception antennas of dual polarization (cross polarized) are possible to be easily separated
The two streams, and the decoding data to being launched.On the other hand, using advanced receiver (MMSE-SIC or MLD)
The performance of LOS user can also be improved.
But it is because that dual polarization can not provide diversity gain, it is impossible to which dual polarized antenna is applied to into the transmitting in unicast point
Collection, such as STBC or SFBC.When which is in unicast and MBMS mixed carriers pattern or UE while receiving unicast and MBMS
When, eNB and UE antenna configurations will frequently be changed with the time, described to configure the increase for causing complexity.On the other hand, it is advanced
Receiver still among research, its performance and complexity are also checked.
The content of the invention
It is an object of the invention to provide a kind of method for precoding for Open-Loop Spatial Multiplexing system, for weakening channel
Between dependency, to improve LOS user performances.
A kind of embodiments in accordance with the present invention, it is proposed that channel method for precoding, are applied to the open loop space of mimo system
Multiplex system, wherein H are the channel transfer matrices of mimo system, and the channel method for precoding is carried out to the signal of input channel
Precoding so that the det (H ' H) of the channel transfer matrices is maximum, so as to allow Open-Loop Spatial Multiplexing system to realize maximum appearance
Amount.
Preferably, the precoding causes each layer signal intensity of mimo system equal and orthogonal, i.e., so that MIMO
Channel transfer matrices H be orthogonal diagonal matrix.
Preferably, in precoding MIMO, the equivalent mimo channel corresponding with specific pre-coding matrix E can pass through
Using HE=HE is reconstructing.
Preferably for M*M mimo systems, channel transfer matrices are entered using cyclic delay diversity CDD precoding modes
Row precoding.
Preferably for the mimo channel transmission matrix of order=2, the equivalent MIMO corresponding with specific pre-coding matrix
Channel isThe pre-coding matrix
Preferably for 2*2MIMO systems, equivalent mimo channel isThe pre-coding matrix E=
C, whereinφ k=π.
Preferably, M*M mimo systems, the equivalent mimo channel transmission matrix corresponding with specific pre-coding matrix E is right
Angle battle array.
Preferably for 2*2MIMO systems, the equivalent mimo channel corresponding with specific pre-coding matrix E is
Preferably, wherein λ=0.333.
Preferably for M*M mimo systems, the equivalent mimo channel transmission matrix corresponding with specific pre-coding matrix E
It is lower triangular matrix.
Preferably for 2*2MIMO systems, the equivalent mimo channel corresponding with specific pre-coding matrix E is
Preferably, the pre-coding matrix D has following form：
Preferably, λ=0.627 and
According to another embodiment of the invention, it is proposed that a kind of channel pre-coding apparatus, it is applied to opening for mimo system
Annular space multiplex system, wherein H are the channel transfer matrices of mimo system, letter of the channel pre-coding apparatus to input channel
Number carry out precoding so that the det (H ' H) of the channel transfer matrices is maximum, so as to allow Open-Loop Spatial Multiplexing system to realize
Maximum capacity.
Preferably, the pre-coding apparatus cause each layer signal intensity of mimo system equal and orthogonal, i.e., so that
The channel transfer matrices H of MIMO is orthogonal diagonal matrix.
Preferably, in precoding MIMO system, the equivalent mimo channel corresponding with specific pre-coding matrix E can be with
By applying HE=HE is reconstructing.
Preferably for M*M mimo systems, precoding is carried out to channel transfer matrices using CDD precodings mode.
Preferably for the mimo channel transmission matrix of order=2, the equivalent MIMO corresponding with specific pre-coding matrix
Channel isThe pre-coding matrix
Preferably for 2*2MIMO systems, equivalent mimo channel isThe pre-coding matrix E=
C, whereinφ k=π.
Preferably for M*M mimo systems, the equivalent mimo channel transmission matrix corresponding with specific pre-coding matrix E
It is diagonal matrix.
Preferably for 2*2MIMO systems, the equivalent mimo channel corresponding with specific pre-coding matrix E is
Preferably, wherein λ=0.333.
Preferably for M*M mimo systems, the equivalent mimo channel transmission matrix corresponding with specific pre-coding matrix E
It is lower triangular matrix.
Preferably for 2*2MIMO systems, the equivalent mimo channel corresponding with specific pre-coding matrix E is
Preferably, wherein the pre-coding matrix D has following form：Preferably, λ=0.627 is simultaneously
And
Technical scheme according to embodiments of the present invention has the advantages that：Precoding can farthest weaken sky
Between in multiplex system channel relevancy impact, UE can be very well using demultiplexing and detection signal, and this greatly changes
It has been apt to E-MBMS service transmission quality, has not introduced any additional complexity in addition；Open loop MIMO suitable for MBSFN.
Description of the drawings
According to the following description for combining accompanying drawing, advantages of the present invention will become prone to understand, wherein：
Fig. 1 shows precoding MIMO channel；
Fig. 2 a show and utilize pre-coding matrixDecorrelation effect, i.e. ρ in method 1, φ k=0；
Fig. 2 b show the p in the corresponding ratio of two-layer signal intensity, i.e. method 1, φ k=0；
Fig. 3 a show and utilize pre-coding matrixDecorrelation effect, i.e. ρ in method 1, φ k=π/
6；
Fig. 3 b show the p in the corresponding ratio of two-layer signal intensity, i.e. method 1, φ k=π/6；
Fig. 4 a show and utilize pre-coding matrixDecorrelation effect, i.e., in method 2
ρ, λ=0.627；
Fig. 4 b show the p in the corresponding ratio of two-layer signal intensity, i.e. method 2, λ=0.627；
Fig. 5 a show and utilize pre-coding matrixDecorrelation effect, i.e., in method 2
ρ, λ=0.333；
Fig. 5 b show the p in the corresponding ratio of two-layer signal intensity, i.e. method 2, λ=0.333；
Fig. 6 a show and utilize pre-coding matrixDecorrelation effect, i.e., in method 3
ρ, λ=0.627；
Fig. 6 b show the p in the corresponding ratio of two-layer signal intensity, i.e. method 3, λ=0.627；
Fig. 7 a show and utilize pre-coding matrixDecorrelation effect, i.e. method 3
In ρ, g1=1.414；
Fig. 7 b show the p, g in the corresponding ratio of two-layer signal intensity, i.e. method 31=1.414；
Fig. 8 shows the performance of the method 2 in link level simulation, whereinλ=0.333；
Fig. 9 shows the BLER curves that UE is received；
Figure 10 shows the corresponding CDF of dependency；
Figure 11 shows the BLER curves that UE is received, and wherein Figure 11 a show that UE is moved in 300m radius regions in cell
Dynamic result, and Figure 11 b have used the result that UE is moved in 100m radius regions in cell；
Figure 12 again illustrates the corresponding CDF of dependency
Specific embodiment
Now embodiments of the invention are provided referring in detail to.To explain that the present invention will be described with reference to the drawings following enforcements
Example.
It is well known that what E-MBMS performances were determined generally by " interrupting (the outage) " probability demands of Cell Edge User.
However, Cell Edge User can receive E-MBMS signals from multiple cells.When Single Frequency Network (SFN) is operated, for cell side
The SINR of edge user may be of a relatively high, such as cell sizes 10.0dB conventional for great majority or more.For cell edge
User these higher SINR can be converted to higher data and capacity for E-MBMS by MIMO spatial reuses.Note
Meaning：If no spatial reuse, multicast/broadcast capacity will increase with the SINR logarithms in high SINR regions.
It has been noted that Open-Loop Transmit Diversity is for the broadcast operated using SFN almost no diversity gain.But for
Open-Loop Spatial Multiplexing, for the multicast of coherent channel also has strict restriction, such as LOS.In an embodiment of the present invention, carry
A kind of open-loop precoding method has been gone out, for channel relevancy being resisted when UE is near the eNB for broadcast space multiplexing.
The explained in general method for precoding according to embodiments of the present invention by taking 2*2 transmission channel matrixes as an example below.
For by channel matrixTwo transmitters of definition, [2Tx, 2Rx] system of two receivers,
HaveOpen-Loop Spatial Multiplexing system is allowed to realize this species of its maximum capacity
The channel matrix of type is to make det (H ' H) maximized channel matrix.If it is constant to provide received signal intensity, i.e., |
h11|2+|h12|2+|h21|2+|h22|2=c, the condition can be converted into following relation：
|h11|2+|h21|2=| h12|2+|h22|2 (1)
Equation (1) represents that this two-layer has equal signal intensity, and equation (2) is each other just representing the channel vector of this two-layer
Hand over.
When the robustness of the channel is measured, need to be normalized which using some properties.In the research phase of the present invention
Between, useTo represent the ratio of the signal intensity of two-layer, and use
To represent the dependency of the channel coefficients of two-layer.
It should be understood that 2*2MIMO transmission channels are simplest mimo systems.For simplicity, it is of the invention
Following part is only described by taking 2*2MIMO Transmission systems as an example.It will be understood by those skilled in the art that of the invention
Method described in following examples also apply be applicable to the mimo system of more than two unit, it is only necessary to which principle of the invention should
For the corresponding pre-coding matrix of the unit number of the mimo system.
Method 1 according to a first embodiment of the present invention
As shown in figure 1, in precoding MIMO, incoming symbol is obtained by E unique translations.With specific precoding square
Battle array E corresponding equivalent mimo channel can be by applying HE=HE is reconstructing.Each UE knows the method for precoding, and
And based on HE demodulating the stream of precoding.
Typically for order=2, in 2*2SU-MIMO, the code book of precoding is [3GPP 36.211].
Without loss of generality, first by E0It is analyzed.
By using with by transmitting and reception parameter ρtAnd ρrThe Kronecker MIMO models of parameterized dependency,
Can be with Simplified analysis.The channel matrix is given by below equation：
Wherein assuming matrix RRAnd RTUnder conditions of unrelated with transmitting and receiving element respectively, holding is constant, RRIt is to receive
Correlation matrix, RTIt is transmitting correlation matrix.For [2Tx, 2Rx] system, RR、RTMatrix has following form：
Hw is the white matrix in space.The element of Hw can be modeled as zero-mean circle symmetric complex stochastic variable.That is,
Hw is unrelated with the dependency of antenna.
For simplifying the analysis, the channel model applied in the present invention is the two emitting antennas from given node B
It is perfectly correlated, and UE receives (such as in SCM typical) on two incoherent reception antennas.So, channel square
Battle array beThe equivalent mimo channel corresponding with specific pre-coding matrix be
Make ρ=ρtThe channel coefficients of two-layer before being precoding, andAfter precoding
Can derive that the dependency of the signal strength ratio of channel coefficients and this two-layer is as follows：
ρpre-coded=0,
Because while the channel vector of this two-layer is orthogonal, this two-layer has diverse signal intensity, therefore ties
Fruit is not so good.For example, if ρ=0.86, ppre-coded=11dB, this represents that the imbalance of two-layer reaches as high as 11dB.
Therefore, it can attempt other pre-coding schemes, cyclic delay diversity (CDD：Cyclic DelayDiversity) it is pre-
Coding.Hypothesis uses frequency domain CDD.In this case, compound precoder be combined with based on Fourier precoding and
CDD based on phase shift postpones, as described below.
Equivalent mimo channel isIt is possible to derive the signal intensity of channel coefficients and this two-layer
The dependency of ratio is as follows：
It can be found that：Code book precoding is the particular case of φ k=0 or φ k=pi/2s in CDD precodings.
Ppre-coded=P (8)
ρpre-codedAnd ppre-codedTraded off, and preferably φ k are allowed system to realize its maximal solution multiplexing performance.
Below with reference to the accompanying drawings the Numerical Simulation Results of method 1 according to a first embodiment of the present invention are described.Fig. 2 a show
Using pre-coding matrixDecorrelation effect, i.e. ρ in method 1, φ k=0.Fig. 2 b show two-layer signal intensity
P, φ k=0 in corresponding ratio, i.e. method 1.Although decorrelation effect in this case is clearly, the letter of this two-layer
Number intensity difference is also very big.
Fig. 3 a show and utilize pre-coding matrixDecorrelation effect, i.e. ρ in method 1, φ k=π/
6.Fig. 3 b show the p in the corresponding ratio of two-layer signal intensity, i.e. method 1, φ k=π/6.The φ k for increasing CDD precodings can
To reduce the difference in signal strength of two-layer, but therefore decorrelation effect will be weakened.Due to SNR very high in MBSFN environment,
The unbalanced of 15dB is acceptable.
It should be understood that for M*M mimo systems, it is possible to use CDD precodings mode is carried out to channel transfer matrices
Precoding.
Method 2 according to a second embodiment of the present invention
Another kind of method for precoding can be attempted.In order to the direct method for realizing orthogonal channel matrix is：Prelist with specific
The code corresponding equivalent mimo channels of matrix E are
Therefore, pre-coding matrix E has following form：G is normalization coefficient.For example, when ρ=0.99
When λ=0.867；λ=0.627 during ρ=0.9；And λ=0.5 during ρ=0.8.
In the method, pre-coding matrix is set as follows：
Equivalent mimo channel isThe signal intensity of channel coefficients and this two-layer can so be derived
The dependency of ratio is as follows：
ppre-coded=P (10)
Fig. 4 a show and utilize pre-coding matrixDecorrelation effect, i.e., in method 2
ρ, λ=0.627.Fig. 4 b show the p in the corresponding ratio of two-layer signal intensity, i.e. method 2, λ=0.627.Although this
In the case of decorrelation effect clearly, when in the NLOS environment, it is also possible to destroy the decorrelation of this two-layer.Previous
In individual part, when λ=0.627,This two-layer so after precoding
Dependency it is as shown in the table：
| ρ | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 |
| ρpre-coded | 0.88 | 0.85 | 0.82 | 0.78 | 0.73 | 0.65 | 0.54 | 0.36 | 0.001 |
When λ=0.333,The dependency of this two-layer such as following table so after precoding
It is shown：
| ρ | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 |
| ρpre-coded | 0.53 | 0.45 | 0.37 | 0.26 | 0.14 | 0.0006 | 0.17 | 0.38 | 0.65 |
Fig. 5 a show and utilize pre-coding matrixDecorrelation effect, i.e., in method 2
ρ, λ=0.333.Fig. 5 b show the p in the corresponding ratio of two-layer signal intensity, i.e. method 2, λ=0.333.Reduce precoding
The λ of matrix can cause the related sexual balance of the two-layer in NLOS to LOS environment after precoding.Based on Such analysis and Fig. 5
In numerical simulation, λ=0.333 is suitable.
It will be apparent to an ordinarily skilled person in the art that for M*M mimo systems, it is corresponding with specific pre-coding matrix E
Equivalent mimo channel transmission matrix be diagonal matrix.
Method 3 according to a third embodiment of the present invention
The third method for precoding can be attempted.In order to the direct method for realizing orthogonal channel matrix is：Prelist with specific
The code corresponding equivalent mimo channels of matrix E areTherefore, pre-coding matrix has following shape
Formula：G is normalization coefficient.For example, λ=0.86 when ρ=0.997；λ=0.627 during ρ=0.9；And ρ
λ=0.5 when=0.8.
In the method, pre-coding matrix is set as follows：
Equivalent mimo channel isThe signal intensity ratio of channel coefficients and two-layer can so be derived
The dependency of rate is as follows：
The numerical simulation of method 3 is as described below.
Fig. 6 a show and utilize pre-coding matrixDecorrelation effect, i.e., in method 3
ρ, λ=0.627.Fig. 6 b show the p in the corresponding ratio of two-layer signal intensity, i.e. method 3, λ=0.627.Although this
In the case of decorrelation effect be enough, on the contrary, when which is in NLOS environment, the difference in signal strength of two-layer becomes non-
Chang great.In 4.2.3 parts, if λ=0.627, then
As shown in Figure 6 b, when ρ → 0, the ratio of the two-layer signal intensity after precoding is derived as 7dB.
Extra gain can be added to ground floor so that two-layer signal intensity in NLOS and LOS environment after precoding
Balance.Fig. 7 a show and utilize pre-coding matrixDecorrelation effect, i.e., in method 3
ρ, g1=1.414.Fig. 7 b show the p, g in the corresponding ratio of two-layer signal intensity, i.e. method 31=1.414.Show in figure
The curve of 3dB is offset by after precoding.
It will be understood by those skilled in the art that for M*M mimo systems, it is corresponding with specific pre-coding matrix E
Equivalent mimo channel transmission matrix is lower triangular matrix.
LOS environment by method for precoding in open loop SM carries out signal decorrelation and must make sacrificial in other respects
Domestic animal.For example, in the equilibrium of method 1 and two-layer signal intensity in method 3 and method 2 in NLOS environment two-layer it is related.It is based on
The analysis and numerical simulation, these precodings are the feasible solutions of open loop SM in SF.
Method 1：φ k=π；(13)
Method 2：λ=0.333；(14)
Method 3：λ=0.627, and
Here it is considered that SFN operation in SNR sufficiently high to resist the difference (highest 10dB) between two-layer signal intensity.
It should also be understood that the step described in above example of the present invention can also provide a kind of channel pre-coding apparatus
To realize, the channel pre-coding apparatus perform channel method for precoding as above.
Here the diagonal precoding recommended by the CDD precodings and method 2 recommended to method 1 is emulated to observe
Performance.
The link rank simulation result of system has been illustrated below.
Main link level simulation parameter is listed in Table 1.
1 link simulation of table is assumed
Fig. 8 shows the performance of the method 2 in link level simulation.Hereλ=0.333.
From Fig. 8 it can be found that in the case of high channel dependency, precoding can at least propose the gain of 2dB.But
Prior thing is：Precoding can change the CDF of dependency.Therefore from from the point of view of statistics, system integration project result
More benefits can be illustrated.
System integration project result is described below.
Main system integration project parameter is listed in table 2.
2 system integration project of table is assumed
Fig. 9 shows BLER (the Block Error Rate) curve that UE is received, and physical link is 16QAM, 2/3turbo
Coding and 2*2 Open-Loop Spatial Multiplexing systems, therefore emission effciency is approximately 3.84bit/s/Hz, does not consider expense.Fig. 9 a are UE
The result of 300m radius regions movement in the cell, and Fig. 9 b are the results that UE is moved in 100 meters of radius regions in cell.
Using the method 2 of method for precoding, whereinλ=0.333.
The corresponding CDF of dependency is again illustrated in Fig. 10.
Generally in spatial Channel Model, the probability of LOS is defined as at 0 distance as 1, and linear reduction until
Cut-off point at d=300m, is 0 in the cut-off point LOS probabilities.
As LOS, Ricean K factors are the simple versions based on K=13-0.03*d (dB), and wherein d is MS
Distance and BS between in units of rice.So when UE is near eNB, either fixed still moves in finite region
It is dynamic, as caused by LOS, channel relevancy will be very big.As shown in Figure 10 a, in this case, there is 59% probability phase
Closing property ＞ 0.9, and apparently have 42% probability dependency ＞ 0.95.It is more that this will cause receptivity to decline.As schemed
Shown in 10b, average BLER reaches as high as 11%.
Precoding can weaken the impact of channel relevancy in space multiplexing system.Final effect is that average BLER is reduced to
3%, this is similar with the effect of NLOS.But when UE is moved away from eNB or in the large area, dependency is with NLOS's
Dependency is overlapped, as shown in Fig. 9 a and Fig. 9 b, it is impossible to provide more gains.
Figure 11 shows the BLER curves that UE is received, and physical link is 16QAM, 2/3Turbo coding, and 2*2SM, therefore
The efficiency of transmission for not considering expense is about 3.84bit/s/Hz.Figure is that 10a has used UE and moves in the 300m radius regions in cell
Dynamic result, and Figure 11 b have used the result that UE is moved in 100m radius regions in cell.The precoding of method 1 is used
Method, whereinφ k=π.
Figure 12 again illustrates the corresponding CDF of dependency.
Precoding can weaken the impact of channel relevancy in space multiplexing system.As shown in Figure 12b, precoding it
Afterwards, there is 17% probability correlation 0.9, and it can be seen that have 9% probability dependency ＞ 0.95.Final effect is average
BLER is reduced to 2%, the average BLER of NLOS even below as shown in figure 11b.When UE is away from eNB or in large area
When mobile, gain does not have so much, as Figure 11 a.Even average BLER is reduced to 2.5% from 5%.
The advantage of inventive solution is：1) precoding can farthest weaken channel in space multiplexing system
The impact of dependency.There is 9% probability dependency ＞ 0.95 after precoding in LOS channels.But if without pre-
Coding, the numeral is 42%；2) UE can very well use demultiplexing and detection signal, which greatly improves E-MBMS
Service transmission quality, referring to simulation result, does not introduce any additional complexity in addition；3) open loop suitable for MBSFN
MIMO.The present invention has good power of test：First, the present invention is positioned at the potential standardization of 3GPP LTE+ and China 4G；
Secondly, many specific control signalings are required in the air on interface, the code book for for example being represented by eNB, both eNB and UE are necessary
Applied pre-coding scheme is both known about, and guarantees that the pre-coding scheme is detectable.
One of ordinary skill in the art will appreciate that：The all or part of step implemented in above-described embodiment method can be led to
Program is crossed to instruct the hardware of correlation to complete, described program can be stored in computer-readable recording medium, perform the journey
The step of above method according to embodiments of the present invention is performed during sequence, the storage medium can be ROM/RAM, disk, CD
Deng storage medium.
While there has been shown and described that some embodiments of the present invention, but it should be understood by one skilled in the art that
In the case of the principle and scope of the present invention limited without departing from claims and its equivalent, can be to the above
Change is made in embodiment.
Claims (18)
1. a kind of channel method for precoding, is applied to the Open-Loop Spatial Multiplexing system of mimo system, and wherein H is the letter of mimo system
Road transmission matrix, the channel method for precoding carry out precoding to the signal of input channel so that the channel transfer matrices
Det (H ' H) it is maximum, so as to allow Open-Loop Spatial Multiplexing system to realize maximum capacity；And
Wherein for 2*2MIMO systems, the precoding is by using the one kind in following pre-coding matrix so that the MIMO
The two-layer signal intensity balance of system：
Wherein corresponding equivalent mimo channel is
Wherein φ k=π, and corresponding equivalent mimo channel is
Wherein corresponding equivalent mimo channel is
Or
Wherein corresponding equivalent mimo channel is
2. method according to claim 1, wherein the precoding cause each layer signal intensity of mimo system equal and
It is orthogonal, i.e., so that the channel transfer matrices H of MIMO is orthogonal diagonal matrix.
3. method according to claim 1, wherein in precoding MIMO system, it is relative with specific pre-coding matrix E
The equivalent mimo channel answered can be by applying HE=HE is reconstructing.
4. method according to claim 3, wherein for M*M mimo systems, using cyclic delay diversity CDD precodings
Mode carries out precoding to channel transfer matrices.
5. method according to claim 3, for M*M mimo systems, corresponding with specific pre-coding matrix E is equivalent
Mimo channel transmission matrix is diagonal matrix.
6. method according to claim 5, wherein for 2*2MIMO systems, corresponding with specific pre-coding matrix E etc.
Imitating mimo channel is Wherein λ=0.333.
7. method according to claim 3, wherein for M*M mimo systems, it is corresponding with specific pre-coding matrix E
Equivalent mimo channel transmission matrix is lower triangular matrix.
8. method according to claim 7, wherein for 2*2MIMO systems, corresponding with specific pre-coding matrix E etc.
Imitating mimo channel is
Wherein described pre-coding matrix D has following form：
9. method according to claim 8, wherein λ=0.627 and
10. a kind of channel pre-coding apparatus, are applied to the Open-Loop Spatial Multiplexing system of mimo system, and wherein H is mimo system
Channel transfer matrices, the channel pre-coding apparatus carry out precoding to the signal of input channel so that the transmission square
The det (H'H) of battle array is maximum, so as to allow Open-Loop Spatial Multiplexing system to realize maximum capacity；And
Wherein for 2*2MIMO systems, the precoding is by using the one kind in following pre-coding matrix so that the MIMO
The two-layer signal intensity balance of system：
Wherein corresponding equivalent mimo channel is
Wherein φ k=π, and corresponding equivalent mimo channel is
Wherein corresponding equivalent mimo channel is
Or
Wherein corresponding equivalent mimo channel is
11. channel pre-coding apparatus according to claim 10, wherein the pre-coding apparatus cause each of mimo system
Layer signal intensity is equal and orthogonal, i.e., so that the channel transfer matrices H of MIMO is orthogonal diagonal matrix.
12. channel pre-coding apparatus according to claim 10, wherein in precoding MIMO system, and specifically prelist
Code matrix E corresponding equivalent mimo channel can be by applying HE=HE is reconstructing.
13. channel pre-coding apparatus according to claim 12, wherein for M*MMIMO systems, using CDD precoding sides
Formula carries out precoding to channel transfer matrices.
14. channel pre-coding apparatus according to claim 12, for M*M mimo systems, with specific pre-coding matrix E
Corresponding equivalent mimo channel transmission matrix is diagonal matrix.
15. channel pre-coding apparatus according to claim 14, wherein for 2*2MIMO systems, with specific precoding square
The battle array corresponding equivalent mimo channels of E are
Wherein λ=0.333.
16. channel pre-coding apparatus according to claim 12, wherein for M*MMIMO systems, with specific precoding square
Battle array E corresponding equivalent mimo channel transmission matrix is lower triangular matrix.
17. channel pre-coding apparatus according to claim 16, wherein for 2*2MIMO systems, with specific precoding square
The battle array corresponding equivalent mimo channels of E areIts
Described in pre-coding matrix D there is following form：
18. channel pre-coding apparatus according to claim 17, wherein λ=0.627 and
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2008/001257 WO2010000095A1 (en) | 2008-07-01 | 2008-07-01 | Method for executing open loop space multiplexing by pre-coding de-correlation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102067475A CN102067475A (en) | 2011-05-18 |
| CN102067475B true CN102067475B (en) | 2017-04-05 |
Family
ID=41465449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880129940.3A Active CN102067475B (en) | 2008-07-01 | 2008-07-01 | The method that Open-Loop Spatial Multiplexing is carried out using precoding decorrelation |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102067475B (en) |
| WO (1) | WO2010000095A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101136718A (en) * | 2006-11-07 | 2008-03-05 | 中兴通讯股份有限公司 | Multi-input multi-output space multiplexing precoding method of wireless communication system |
| CN101146078A (en) * | 2006-12-27 | 2008-03-19 | 中兴通讯股份有限公司 | A selection method for multi-input and multi-output space multiplexing pre-coding matrix |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7567621B2 (en) * | 2004-07-21 | 2009-07-28 | Qualcomm Incorporated | Capacity based rank prediction for MIMO design |
| KR20070108304A (en) * | 2005-10-31 | 2007-11-09 | 삼성전자주식회사 | Method and apparatus for transmitting/receiving of channel quality imformation in multi antenna system |
| US7702029B2 (en) * | 2006-10-02 | 2010-04-20 | Freescale Semiconductor, Inc. | MIMO precoding enabling spatial multiplexing, power allocation and adaptive modulation and coding |
| CN101166052B (en) * | 2006-10-19 | 2012-05-23 | 株式会社Ntt都科摩 | Precoding method for multi-input multi-output system and apparatus using same |
-
2008
- 2008-07-01 CN CN200880129940.3A patent/CN102067475B/en active Active
- 2008-07-01 WO PCT/CN2008/001257 patent/WO2010000095A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101136718A (en) * | 2006-11-07 | 2008-03-05 | 中兴通讯股份有限公司 | Multi-input multi-output space multiplexing precoding method of wireless communication system |
| CN101146078A (en) * | 2006-12-27 | 2008-03-19 | 中兴通讯股份有限公司 | A selection method for multi-input and multi-output space multiplexing pre-coding matrix |
Non-Patent Citations (2)
| Title |
|---|
| Deficiencies of "Kronecker" MIMO radio channel model;M.Herdin，W.Weichselberger，J.Wallace，E.Bonek;《Electronics Letters》;20030807;第39卷(第16期);全文 * |
| Linear precoding for space-time coded systems with known fading correlations;H.Sampath,A.Paulraj;《IEEE Communications Letters》;20020630;第6卷(第6期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010000095A1 (en) | 2010-01-07 |
| CN102067475A (en) | 2011-05-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8194760B2 (en) | Method and apparatus for distributed space-time coding in wireless radio networks | |
| CN101686110B (en) | Multi-input multi-output system, data transmission method and data transmission device thereof | |
| CN101378299B (en) | Transmission diversity method base on null-frequency encoding | |
| CN106470064B (en) | Transmission diversity method and apparatus | |
| Kyröläinen et al. | Applicability of MIMO to satellite communications | |
| KR20070086976A (en) | Cooperative mimo in multicell wireless networks | |
| CN101764632B (en) | Mapping method and device of ports and antennae in long term evolution-time division duplex (LTE-TDD) indoor distribution system | |
| US9106289B2 (en) | Antenna device and method for precoding data in a multiple-input multiple-output system | |
| CN101582710B (en) | Method, system and device for selecting antenna mode | |
| CN101820405A (en) | Multiple input and multiple output cooperative communication method as well as precoding device and wireless communication system | |
| CN103516486A (en) | Vector selection modulation-based multi-antenna transmission method, receiving method and device | |
| CN102067475B (en) | The method that Open-Loop Spatial Multiplexing is carried out using precoding decorrelation | |
| US8514961B2 (en) | Method and apparatus for distributed space-time coding in wireless radio networks | |
| CN107863995B (en) | Data sending method, data receiving method, equipment and system | |
| CN101785213A (en) | Combined relaying method and apparatus for a plurality of relay stations in wireless communication network | |
| Bergaoui et al. | Scalable and adaptable diversity/multiplexing trade-off in a multi-user massive-MIMO environment | |
| KR20090076322A (en) | A method for transmitting/receiving signal in a multiple input multiple output system | |
| Li et al. | Differential spatial modulated OFDM in underwater acoustic communications | |
| ElKalagy et al. | A novel spatial modulation technique with interference free simultaneous transmission | |
| Huang et al. | Impact of channel estimation error on performance of adaptive MIMO systems | |
| CN101582711B (en) | Method, system and device for selecting antenna mode | |
| Li et al. | Distributed space-time block coding in multi-way amplify-and-forward relaying networks | |
| Huang et al. | Discrete rate spectral efficiency improvement by scheme switching for MIMO systems | |
| Tissari et al. | Scenario dependence of MIMO techniques | |
| CN101729213B (en) | Data communication method, data communication device and data communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201206 Pudong New Area, Nanjing Road, No. 388, Shanghai Patentee after: Shanghai NOKIA Baer Limited by Share Ltd Address before: 201206 Pudong New Area, Nanjing Road, No. 388, Shanghai Patentee before: Shanghai Alcatel-Lucent Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder |