CN102316069B - Method for realizing channel information feedback and device - Google Patents
Method for realizing channel information feedback and device Download PDFInfo
- Publication number
- CN102316069B CN102316069B CN201110281957.4A CN201110281957A CN102316069B CN 102316069 B CN102316069 B CN 102316069B CN 201110281957 A CN201110281957 A CN 201110281957A CN 102316069 B CN102316069 B CN 102316069B
- Authority
- CN
- China
- Prior art keywords
- matrix
- fed back
- mathematical transformation
- value
- feedback
- 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
- 238000000034 method Methods 0.000 title claims abstract description 50
- 239000011159 matrix material Substances 0.000 claims abstract description 112
- 230000009466 transformation Effects 0.000 claims description 73
- 230000005540 biological transmission Effects 0.000 claims description 32
- 230000002441 reversible effect Effects 0.000 claims description 30
- 230000006870 function Effects 0.000 claims description 18
- 238000010276 construction Methods 0.000 claims description 12
- JXASPPWQHFOWPL-UHFFFAOYSA-N Tamarixin Natural products C1=C(O)C(OC)=CC=C1C1=C(OC2C(C(O)C(O)C(CO)O2)O)C(=O)C2=C(O)C=C(O)C=C2O1 JXASPPWQHFOWPL-UHFFFAOYSA-N 0.000 claims description 6
- 238000013139 quantization Methods 0.000 abstract description 18
- 230000008569 process Effects 0.000 abstract description 11
- 238000012545 processing Methods 0.000 abstract description 5
- 230000006835 compression Effects 0.000 description 12
- 238000007906 compression Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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
- H04B7/0613—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]
-
- 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
- H04B7/0652—Feedback error handling
- H04B7/0654—Feedback error handling at the receiver, e.g. antenna verification at mobile station
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03777—Arrangements for removing intersymbol interference characterised by the signalling
- H04L2025/03802—Signalling on the reverse channel
- H04L2025/03808—Transmission of equaliser coefficients
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Radio Transmission System (AREA)
Abstract
The invention discloses a method for realizing the channel information feedback and a device. The method comprises the following steps that: a matrix P to be fed back is built according to the channel information to be fed back, each element in the matrix P to be bed back is respectively modulated onto orthogonal frequency division multiplexing (OFDM) sub carrier waves and is fed back, and the modulation aiming at each element comprises the process of building an entity part and a virtual part corresponding to the carrier wave emission signals of the OFDM sub carrier waves according to the parameters of the elements. Aiming at the problems of quantization error existence and incomplete feedback information in the traditional quantization feedback mode, the scheme provides a set of complete concrete processing algorithm and flow process on the basis of the non-quantization feedback idea, the non-quantization feedback mode is adopted so that the feedback information of the feedback includes all channel information, the channel information can be effectively fed back in the existing multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) system, and all characteristics of the channel information can be completely recovered by the receiving side.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for implementing channel information feedback in a system using Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO) technologies.
Background
The OFDM technology is a transmission technology adopted by Long Term Evolution (LTE) and Wimax in a new generation (4G) wireless cellular system, and has the advantages of high frequency efficiency, resistance to multipath propagation effect, simple transceiving processing, and the like, thereby becoming a mainstream transmission technology of a new generation communication standard.
MIMO technology is to place more than 1 antenna at both ends of transmission and reception, and transmit information through multiple transmission and reception channels. The MIMO technology has been proven to greatly improve the spectral efficiency of the system both theoretically and practically, and thus is widely adopted in various 4G standards.
The cellular system specified by the 4G standard is, from the physical layer point of view, such a transmission system that applies a combination of MIMO and OFDM techniques.
The channel information feedback means that after the receiving side obtains the channel information through measurement, the receiving side informs the transmitting side of the channel information through a reverse link, and the transmitting side performs subsequent transmission more matched with the channel characteristics by using the channel information. Such matching includes: the selection of the modulation coding mode matched with the power fading value of the channel and the selection of the precoding vector matched with the space characteristic of the channel.
The existing channel information feedback method is based on the idea of quantization feedback, namely: after obtaining channel information by measurement, the receiving side selects a modulation mode and a coding rate suitable for a channel from a preset modulation coding mode table, and feeds back the serial number of the modulation mode and the coding rate to the transmitting side; meanwhile, the receiving side selects a precoding vector which is most matched with the channel characteristics from a pre-designed precoding vector table, and the number of the precoding vector is fed back to the transmitting side. The method is an indirect feedback mode, the essence of the method is that information to be fed back is firstly quantized and then fed back from different dimensions, and the method has the advantages of simple feedback information and low feedback overhead.
However, this feedback method also has obvious disadvantages, because of quantization feedback, it is necessarily limited by quantization accuracy and further has quantization error, and meanwhile, because of indirect feedback, only some characteristics of the original information are fed back, in this process, the transmitting side cannot completely recover the original information, and some key characteristics of the information are obtained. With the development of MIMO technology, especially the emergence of Multi-User MIMO (MU-MIMO) technology and coordinated Multi-Point transmission (CoMP) technology, only some key features of channel information cannot support accurate selection of transmission parameters on the transmitting side to match a channel, and even some transmission parameters cannot be calculated under the condition of applying some more advanced algorithms, so that the result of the two conditions is that performance is reduced due to non-optimal selection of the transmission parameters, or the more advanced algorithms cannot be applied due to non-calculation of the transmission parameters.
Two methods for solving the problems are provided, one is to enhance the information amount fed back by the quantization feedback method, quantize and feed back more characteristics of channel information; the other method is that the quantization feedback is changed into non-quantization feedback, and the channel information is not quantized but directly fed back.
How to reduce the minimization error and the feedback information through non-quantization feedback is not a technical problem to be solved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a device for realizing channel information feedback, and solve the problems of quantization error and incomplete feedback information existing in a quantization feedback mode.
In order to solve the above technical problem, the present invention provides a method for implementing channel information feedback, wherein a matrix P to be fed back is constructed according to channel information to be fed back, each element in the matrix P to be fed back is modulated onto an OFDM subcarrier and fed back, and the modulation for each element includes: real and imaginary parts of the carrier transmit signal corresponding to the OFDM subcarriers are constructed from the parameters of this element.
Further, the method can also have the following characteristics:
and performing reversible first mathematical transformation on the modulus value of the element to be used as a real part of a carrier transmitting signal corresponding to the OFDM subcarrier, and performing reversible second mathematical transformation on the amplitude and the angle of the element to be used as an imaginary part of the carrier transmitting signal corresponding to the OFDM subcarrier.
Further, the method can also have the following characteristics:
and performing reversible first mathematical transformation on the real part of the element to be used as the real part of the carrier transmission signal corresponding to the OFDM subcarrier, and performing reversible second mathematical transformation on the imaginary part of the element to be used as the imaginary part of the carrier transmission signal corresponding to the OFDM subcarrier.
Further, the method can also have the following characteristics:
the functions of the first mathematical transformation and the second mathematical transformation function have the characteristic that the transformed values are within a limited range, the upper and lower bounds of which are both real numbers, and the transformation is a reversible transformation.
Further, the method can also have the following characteristics:
the function of the first mathematical transformation is f (x):
wherein L, B is a constant coefficient;
the function of the second mathematical transformation is g (x):
g(θ)＝θ/2π。
further, the method can also have the following characteristics:
the first mathematical transformation and the second mathematical transformation are the same.
Further, the method can also have the following characteristics:
and constructing the matrix P to be fed back according to the channel coefficient matrix H, wherein the construction method is one of the following methods:
firstly, the matrix P to be fed back is the same as the channel coefficient matrix H;
two, P is H/sigma, sigma is constant number, and sigma is taken asOr the interference noise power estimation value is provided with a root, wherein i refers to an abscissa value of the matrix element, and j is an ordinate value of the matrix element;
three, P ═ H.HH/σ2σ is a constant number, σ2The value isOr an interference noise power estimate, where i refers to the abscissa values of the matrix elements, j is the ordinate values of the matrix elements, and the Hermite matrix.
In order to solve the above technical problem, the present invention provides a device for implementing channel information feedback, wherein the device comprises a matrix construction unit to be fed back, a modulation unit and a feedback unit;
the matrix construction unit to be fed back is used for constructing a matrix P to be fed back according to the channel information to be fed back;
the modulation unit is configured to modulate each element in the matrix P to be fed back onto an OFDM subcarrier, where the modulation for each element includes: constructing a real part and an imaginary part of a carrier wave transmitting signal corresponding to the OFDM subcarrier according to the parameter of the element;
the feedback unit is used for sending the carrier wave transmitting signal modulated to the DFDM subcarrier.
Further, the device can also have the following characteristics:
the modulation unit is further configured to perform reversible first mathematical transformation on the modulus value of the element to obtain a real part of a carrier transmission signal corresponding to the OFDM subcarrier, and perform reversible second mathematical transformation on the argument of the element to obtain an imaginary part of the carrier transmission signal corresponding to the OFDM subcarrier.
Further, the device can also have the following characteristics:
the modulation unit is used for performing reversible first mathematical transformation on the real part of the element to be used as the real part of the carrier wave transmitting signal corresponding to the OFDM subcarrier and performing reversible second mathematical transformation on the imaginary part of the element to be used as the imaginary part of the carrier wave transmitting signal corresponding to the OFDM subcarrier.
Further, the device can also have the following characteristics:
the functions of the first mathematical transformation and the second mathematical transformation function have the characteristic that the transformed values are within a limited range, the upper and lower bounds of which are both real numbers, and the transformation is a reversible transformation.
Further, the device can also have the following characteristics:
and constructing the matrix P to be fed back according to the channel coefficient matrix H, wherein the construction method is one of the following methods:
firstly, the matrix P to be fed back is the same as the channel coefficient matrix H;
two, P is H/sigma, sigma is constant number, and sigma is taken asOr the interference noise power estimation value is root-opened, wherein i refers to the sit-astride of the matrix elementScalar value, j is the ordinate value of the matrix element;
three, P ═ H.HH/σ2σ is a constant number, σ2The value isOr an interference noise power estimation value, wherein i refers to an abscissa value of a matrix element, and j is an ordinate value of the matrix element.
Aiming at the problems of quantization error and incomplete feedback information in the traditional quantization feedback mode, the scheme provides a set of complete specific processing algorithm and flow on the basis of the non-quantization feedback idea, adopts the non-quantization feedback mode to enable the feedback information to contain all channel information, can effectively feed back the channel information in the existing MIMO-OFDM system, and enables a receiving side to completely restore all characteristics of the channel information.
Drawings
Fig. 1 is a schematic diagram of a method for implementing channel information feedback;
fig. 2 is a schematic diagram of a manner of constructing feedback information of the matrix P to be fed back according to the channel coefficient matrix H.
Detailed Description
As shown in fig. 1, the method for implementing channel information feedback includes: constructing a matrix P to be fed back according to channel information to be fed back, respectively modulating each element in the matrix P to be fed back to an OFDM subcarrier and feeding back, wherein the modulation aiming at each element comprises the following steps: real and imaginary parts of the carrier transmit signal corresponding to the OFDM subcarriers are constructed from the parameters of this element.
The matrix P to be fed back is constructed according to a channel coefficient matrix H, the channel coefficient matrix H is obtained according to channel estimation, the channel coefficient matrix H is a matrix of M x N, M is the number of receiving antennas, N is the number of transmitting antennas, and M and N are positive integers.
As shown in fig. 2, the matrix P to be fed back is constructed according to the channel coefficient matrix H, and the construction method is one of the following methods:
firstly, the matrix P to be fed back is the same as the channel coefficient matrix H;
two, P is H/sigma, sigma is constant number, and sigma is taken asOr the power estimation value of the interference noise is set with a root, wherein i refers to the abscissa value of the matrix element, j is the ordinate value of the matrix element, | | | represents the modulus value, and P is the dimension [ the number of receiving antennas ] the number of transmitting antennas [ ]]The complex coefficient matrix of (2).
Three, P ═ H.HH/σ2σ is a constant number (·)HDenotes the conjugate transpose, σ2The value isOr an interference noise power estimation value, wherein i refers to an abscissa value of the matrix element, j is an ordinate value of the matrix element, | | represents a modulus value, and P is a dimension [ number of receiving antennas ] number of receiving antennas [ ]]The hermitian matrix of.
The way of constructing the real part and the imaginary part of the carrier transmission signal corresponding to the OFDM subcarrier according to the parameter of this element may be one of the following ways:
in the first mode, the module value of the element is subjected to reversible first mathematical transformation and then is used as the real part of the carrier wave transmitting signal corresponding to the OFDM subcarrier, and the amplitude and the angle of the element are subjected to reversible second mathematical transformation and then are used as the imaginary part of the carrier wave transmitting signal corresponding to the OFDM subcarrier.
The functions of the first mathematical transformation and the second mathematical transformation function have the characteristic that the transformed values are within a limited range, the upper and lower bounds of which are both real numbers, and the transformation is a reversible transformation. For example, the value after the first mathematical transformation is between 0 and N, and the value after the first mathematical transformation is between 0 and M.
The function of the first mathematical transformation is f (x), f (x) may be performed in a variety of ways, for example,
wherein L, B is a constant coefficient;
the function of the second mathematical transformation is g (x), g (x) can be implemented in a number of ways, for example:
g(θ)＝θ/2π。
and in a second mode, the real part of the element is subjected to reversible first mathematical transformation and then is used as the real part of the carrier transmission signal corresponding to the OFDM subcarrier, and the imaginary part of the element is subjected to reversible second mathematical transformation and then is used as the imaginary part of the carrier transmission signal corresponding to the OFDM subcarrier.
The functions of the first mathematical transformation and the second mathematical transformation function have the characteristic that the transformed values are within a limited range, the upper and lower bounds of which are both real numbers, and the transformation is a reversible transformation.
The first mathematical transformation and the second mathematical transformation may be the same and the value after the first mathematical transformation or the second mathematical transformation may be between 0 and N.
For example, as follows, the method for implementing channel information feedback may specifically include the following steps:
step 1: and constructing a matrix P to be fed back by using the channel coefficient matrix H, wherein both H and P are complex coefficient matrixes with dimensionality [ the number of receiving antennas x the number of transmitting antennas ]. The number of receiving antennas is M, and the number of transmitting antennas is N.
And constructing the matrix P to be fed back according to the channel coefficient matrix H, wherein the construction method is one of the following methods:
firstly, the matrix P to be fed back is the same as the channel coefficient matrix H;
two, P is H/sigma, sigma is constant number, and sigma is taken asOr the power estimation value of the interference noise is set with a root, wherein i refers to the abscissa value of the matrix element, j is the ordinate value of the matrix element, | | | represents the modulus value, and P is the dimension [ the number of receiving antennas ] the number of transmitting antennas [ ]]The complex coefficient matrix of (2).
Three, P ═ H.HH/σ2σ is a constant number (·)HDenotes the conjugate transpose, σ2The value isOr an interference noise power estimation value, wherein i refers to an abscissa value of the matrix element, j is an ordinate value of the matrix element, | | represents a modulus value, and P is a dimension [ number of receiving antennas ] number of receiving antennas [ ]]The hermitian matrix of.
Step 2: and (3) carrying out the following processing on each element in the P matrix:
step 2.1, calculate Pi，jThe modulus and argument of (1), wherein the modulus A ═ Pi，j| angle θ ═ arg (P)i，j)。
Step 2.2, the modulus a is subjected to a numerical compression operation, i.e. by a mathematical transformation a ═ f (a), such that a' is ∈ [0, N ], where the mathematical transformation f is a reversible transformation.
Step 2.3, the argument θ is subjected to a numerical compression operation, i.e. θ 'is made to be ∈ [0, M ] by a mathematical transformation θ', g being a reversible transformation.
And 2.4, taking the A 'and the theta' as a real part and an imaginary part respectively, constructing a carrier transmission signal S ═ A '+ theta' · j, and modulating the carrier transmission signal S onto the OFDM carrier.
And step 3: after receiving the feedback signal, the transmitting side recovers the original signal by taking the real part and the imaginary part, performing inverse transformation of f, inverse transformation of g and the like, and the process is ended.
In the above process, if the element P is present in step 2.2 when the process 3 is used in step 1, the element P is addedi，jFor a real number, i.e. argument θ is 0, step 2.3 may be skipped, and the calculation formula of step 2.4 is modified to be S ═ a'.
For example, as follows, the method for implementing channel information feedback may specifically include the following steps:
step 1: and constructing a matrix P to be fed back by using the channel coefficient matrix H, wherein both H and P are complex coefficient matrixes with dimensionality [ the number of receiving antennas x the number of transmitting antennas ]. The number of receiving antennas is M, and the number of transmitting antennas is N.
Step 2: and (3) carrying out the following processing on each element in the P matrix:
step 2.1, for Pi，jRespectively, take A as real (P)i，j)，I＝imag(Pi，j) Denotes taking P respectivelyi，jThe real and imaginary parts of (c).
Step 2.2, the real part a is subjected to a numerical compression operation, i.e. by a mathematical transformation a '═ f (a), such that a' e [0, N ], where the mathematical transformation f is a reversible transformation.
Step 2.3, the imaginary part I is subjected to a numerical compression operation, i.e. by mathematically transforming I '═ f (I) such that I' ∈ [0, M ], where the mathematical transformation f is the same as in step 2.2 above.
And step 2.4, taking the A 'and the I' as a real part and an imaginary part respectively, constructing a carrier transmission signal S ═ A '+ I' · j, and modulating the carrier transmission signal S onto the OFDM carrier.
And step 3: after receiving the feedback signal, the transmitting side recovers the original signal by taking the real part and the imaginary part, performing inverse transformation of f, inverse transformation of g and the like, and the process is ended.
The device for realizing the channel information feedback comprises a matrix construction unit to be fed back, a modulation unit and a feedback unit.
And the matrix construction unit to be fed back is used for constructing a matrix P to be fed back according to the channel information to be fed back.
The modulation unit is configured to modulate each element in the matrix P to be fed back onto an OFDM subcarrier, where the modulation for each element includes: real and imaginary parts of the carrier transmit signal corresponding to the OFDM subcarriers are constructed from the parameters of this element.
The feedback unit is used for sending the carrier wave transmitting signal modulated to the DFDM subcarrier.
The specific implementation manner of each unit is the same as that described in the above method, and is not described herein again.
The present solution is explained in detail below by means of specific examples.
Detailed description of the preferred embodiment
Obtaining a channel coefficient matrix H through measurement, wherein the dimensionality of the channel coefficient matrix H is a complex coefficient matrix of [ the number of receiving antennas + the number of transmitting antennas ]; taking the matrix H as the matrix P to be fed back.
Taking a certain element P in the matrix Pi，jAnd performing feedback related operation.
First, P is calculatedi，jThe modulus and argument of (1), wherein the modulus A ═ Pi，j| angle θ ═ arg (P)i，j)。
Secondly, a numerical compression operation is carried out on A, and the range of the A value is judged, and the A value is assumed to belong toThe compressed value
Thirdly, carrying out numerical compression operation on theta
And taking the A 'and the theta' as a real part and an imaginary part respectively, constructing a carrier transmission signal S ═ A '+ theta' · j, and modulating the carrier transmission signal S onto the OFDM carrier.
And thirdly, selecting another element from the P matrix, and repeating the process to complete the feedback of the element until all the elements in the P matrix are fed back.
Finally, the receiving side receives and recovers the original transmitted information.
Detailed description of the invention
And obtaining a channel coefficient matrix H through measurement, wherein the dimension of the channel coefficient matrix is a complex coefficient matrix of the receiving antenna number and the transmitting antenna number.
And H is normalized to obtain P ═ H/sigma, wherein sigma is an open root of the interference noise power estimation value.
Taking an element P in Pi，jAnd performing feedback related operation.
First, P is calculatedi，jThe modulus and argument of (1), wherein the modulus A ═ Pi，j| angle θ ═ arg (P)i，j)。
Next, a numerical compression operation is performed on a to determine which range the value of a belongs to, assuming,the compressed value
Thirdly, carrying out numerical compression operation on theta
Thirdly, modulating A 'and theta' as a real part and an imaginary part respectively onto the OFDM carrier, namely constructing a carrier transmission signal S ═ A '+ theta' · j
And thirdly, selecting another element from the P matrix, and repeating the process to complete the feedback of the element until all the elements in the P matrix are fed back.
Finally, the receiving side receives and recovers the original transmitted information.
Detailed description of the preferred embodiment
And obtaining a channel coefficient matrix H through measurement, wherein the dimension of the channel coefficient matrix is a complex coefficient matrix of the receiving antenna number and the transmitting antenna number.
Converting H to obtain P ═ H.HH/σ2Where σ is2Is an interference noise power estimate.
Taking an element P in Pi，jAnd performing feedback related operation.
First, P is calculatedi，jThe modulus and argument of (1), wherein the modulus A ═ Pi，j| angle θ ═ arg (P)i，j)。
Next, a is subjected to a numerical compression operation to determine to which range the value of a belongs, and assuming that a is equal to or greater than B, the compressed value a' is equal to 1.
Thirdly, carrying out numerical compression operation on theta
And modulating the A 'and the theta' respectively as a real part and an imaginary part onto the OFDM carrier, namely constructing a carrier transmission signal S ═ A '+ theta' · j.
And thirdly, selecting another element from the P matrix, and repeating the process to complete the feedback of the element until all the elements in the P matrix are fed back.
Finally, the receiving side receives and recovers the original transmitted information.
Detailed description of the invention
Obtaining a channel coefficient matrix H through measurement, wherein the dimensionality of the channel coefficient matrix H is a complex coefficient matrix of [ the number of receiving antennas + the number of transmitting antennas ]; taking the matrix H as the matrix P to be fed back.
Taking an element P in Pi，jAnd performing feedback related operation.
First, P is obtainedi，jA real part and an imaginary part of (b), wherein the real part a ═ real (P)i，j) Imaginary part I ═ imag (P)i，j)
Secondly, a numerical compression operation is carried out on A, and the range of the A value is judged, and the A value is assumed to belong toThe compressed value
Thirdly, carrying out numerical compression operation on the I, judging which range the I value belongs to, and assuming thatThe compressed value
And taking A 'and I' as a real part and an imaginary part respectively, constructing a carrier transmission signal S ═ A '+ I' · j, and modulating the carrier transmission signal S ═ A '+ I' · j onto the OFDM carrier.
And thirdly, selecting another element from the P matrix, and repeating the process to complete the feedback of the element until all the elements in the P matrix are fed back.
Finally, the receiving side receives and recovers the original transmitted information.
It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.
Claims (8)
1. A method for realizing channel information feedback, wherein,
constructing a matrix P to be fed back according to channel information to be fed back, respectively modulating each element in the matrix P to be fed back to an OFDM subcarrier and feeding back, wherein the modulation aiming at each element comprises the following steps: constructing a real part and an imaginary part of a carrier wave transmitting signal corresponding to the OFDM subcarrier according to the parameter of the element;
performing reversible first mathematical transformation on the modulus value of the element to be used as a real part of a carrier transmitting signal corresponding to the OFDM subcarrier, and performing reversible second mathematical transformation on the amplitude and the angle of the element to be used as an imaginary part of the carrier transmitting signal corresponding to the OFDM subcarrier;
or,
and performing reversible first mathematical transformation on the real part of the element to be used as the real part of the carrier transmission signal corresponding to the OFDM subcarrier, and performing reversible second mathematical transformation on the imaginary part of the element to be used as the imaginary part of the carrier transmission signal corresponding to the OFDM subcarrier.
2. The method of claim 1,
the functions of the first mathematical transformation and the second mathematical transformation function have the characteristic that the transformed values are within a limited range, the upper and lower bounds of which are both real numbers, and the transformation is a reversible transformation.
3. The method of claim 2,
the function of the first mathematical transformation is f (x):
wherein L, B is a constant coefficient;
the function of the second mathematical transformation is g (x):
g(θ)＝θ/2π。
4. the method of claim 1,
the first mathematical transformation and the second mathematical transformation are the same.
5. The method of any one of claims 1 to 4,
and constructing the matrix P to be fed back according to the channel coefficient matrix H, wherein the construction method is one of the following methods:
firstly, the matrix P to be fed back is the same as the channel coefficient matrix H;
two, P is H/sigma, sigma is constant number, and sigma is taken asOr the interference noise power estimation value is provided with a root, wherein i refers to an abscissa value of the matrix element, and j is an ordinate value of the matrix element;
three, P ═ H.HH/σ2σ is a constant number, σ2The value isOr an interference noise power estimate, where i refers to the abscissa values of the matrix elements, j is the ordinate values of the matrix elements, and the Hermite matrix.
6. A device for realizing channel information feedback comprises a matrix construction unit to be fed back, a modulation unit and a feedback unit;
the matrix construction unit to be fed back is used for constructing a matrix P to be fed back according to the channel information to be fed back;
the modulation unit is configured to modulate each element in the matrix P to be fed back onto an OFDM subcarrier, where the modulation for each element includes: constructing a real part and an imaginary part of a carrier wave transmitting signal corresponding to the OFDM subcarrier according to the parameter of the element;
the feedback unit is used for sending a carrier wave transmitting signal modulated to the OFDM subcarrier;
the modulation unit is further configured to perform reversible first mathematical transformation on the modulus value of the element to obtain a real part of a carrier transmission signal corresponding to the OFDM subcarrier, and perform reversible second mathematical transformation on the argument of the element to obtain an imaginary part of the carrier transmission signal corresponding to the OFDM subcarrier;
or,
the modulation unit is used for performing reversible first mathematical transformation on the real part of the element to be used as the real part of the carrier wave transmitting signal corresponding to the OFDM subcarrier and performing reversible second mathematical transformation on the imaginary part of the element to be used as the imaginary part of the carrier wave transmitting signal corresponding to the OFDM subcarrier.
7. The apparatus of claim 6,
the functions of the first mathematical transformation and the second mathematical transformation function have the characteristic that the transformed values are within a limited range, the upper and lower bounds of which are both real numbers, and the transformation is a reversible transformation.
8. The apparatus according to any of the claims 6 to 7,
and constructing the matrix P to be fed back according to the channel coefficient matrix H, wherein the construction method is one of the following methods:
firstly, the matrix P to be fed back is the same as the channel coefficient matrix H;
two, P is H/sigma, sigma is constant number, and sigma is taken asOr the interference noise power estimation value is provided with a root, wherein i refers to an abscissa value of the matrix element, and j is an ordinate value of the matrix element;
three, P ═ H.HH/σ2σ is a constant number, σ2The value isOr an interference noise power estimation value, wherein i refers to an abscissa value of a matrix element, and j is an ordinate value of the matrix element.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110281957.4A CN102316069B (en) | 2011-09-21 | 2011-09-21 | Method for realizing channel information feedback and device |
| PCT/CN2011/083152 WO2012155493A1 (en) | 2011-09-21 | 2011-11-29 | Method and apparatus for realizing channel information feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110281957.4A CN102316069B (en) | 2011-09-21 | 2011-09-21 | Method for realizing channel information feedback and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102316069A CN102316069A (en) | 2012-01-11 |
| CN102316069B true CN102316069B (en) | 2017-02-15 |
Family
ID=45428895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110281957.4A Active CN102316069B (en) | 2011-09-21 | 2011-09-21 | Method for realizing channel information feedback and device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102316069B (en) |
| WO (1) | WO2012155493A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9590706B1 (en) * | 2015-09-16 | 2017-03-07 | Motorola Mobility Llc | Method and apparatus for equal energy codebooks for antenna arrays with mutual coupling |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101127548A (en) * | 2007-08-18 | 2008-02-20 | 姜永权 | Non cooperative virtual MIMO technology |
| CN101821963A (en) * | 2007-10-11 | 2010-09-01 | 高通股份有限公司 | Fast square root algorithm for MIMO equalization |
| CN101854328A (en) * | 2010-07-05 | 2010-10-06 | 河南工业大学 | Layered space-time nonlinear precoding method in multi-carrier code division multiple access (MC-CDMA) system |
| CN101873190A (en) * | 2009-04-21 | 2010-10-27 | 华为技术有限公司 | Pre-coding method and device |
| CN101931440A (en) * | 2009-06-19 | 2010-12-29 | 华为技术有限公司 | Channel state information acquisition method and device |
| CN101931494A (en) * | 2009-06-22 | 2010-12-29 | 中兴通讯股份有限公司 | Device and method for transmitting channel quality information |
| 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 |
| CN102104452A (en) * | 2009-12-22 | 2011-06-22 | 华为技术有限公司 | Channel state information feedback method, channel state information acquisition method and equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7327795B2 (en) * | 2003-03-31 | 2008-02-05 | Vecima Networks Inc. | System and method for wireless communication systems |
| CN101632253A (en) * | 2007-03-12 | 2010-01-20 | 高通股份有限公司 | Multiplexing of feedback channels in a wireless communication system |
| PL2375604T3 (en) * | 2009-01-07 | 2019-01-31 | Sun Patent Trust | Wireless communication apparatus, wireless communication system and wireless communication method |
| CN101478512B (en) * | 2009-01-22 | 2011-04-27 | 清华大学 | Data precoding method for MIMO wireless communication system |
-
2011
- 2011-09-21 CN CN201110281957.4A patent/CN102316069B/en active Active
- 2011-11-29 WO PCT/CN2011/083152 patent/WO2012155493A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101127548A (en) * | 2007-08-18 | 2008-02-20 | 姜永权 | Non cooperative virtual MIMO technology |
| CN101821963A (en) * | 2007-10-11 | 2010-09-01 | 高通股份有限公司 | Fast square root algorithm for MIMO equalization |
| CN101873190A (en) * | 2009-04-21 | 2010-10-27 | 华为技术有限公司 | Pre-coding method and device |
| CN101931440A (en) * | 2009-06-19 | 2010-12-29 | 华为技术有限公司 | Channel state information acquisition method and device |
| CN101931494A (en) * | 2009-06-22 | 2010-12-29 | 中兴通讯股份有限公司 | Device and method for transmitting channel quality information |
| CN102104452A (en) * | 2009-12-22 | 2011-06-22 | 华为技术有限公司 | Channel state information feedback method, channel state information acquisition method and equipment |
| CN101854328A (en) * | 2010-07-05 | 2010-10-06 | 河南工业大学 | Layered space-time nonlinear precoding method in multi-carrier code division multiple access (MC-CDMA) 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012155493A1 (en) | 2012-11-22 |
| CN102316069A (en) | 2012-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103210592B (en) | For the phase rotating of multi-user wireless communication | |
| US8451926B2 (en) | Method and device for pre-coding in multiple input multiple output system | |
| CN101378277B (en) | Multi-user pre-coding and dispatching method and realize the base station of the method | |
| CN101682379B (en) | Method and apparatus for feedback in closed loop transmitting | |
| CN102100013B (en) | Method and system for antenna training and communication protocol for multi-beamforming communication | |
| US8891648B2 (en) | System for transmitting and receiving channel state information | |
| CN107483091B (en) | Channel information feedback algorithm under FDD large-scale MIMO-OFDM system | |
| CN110212959B (en) | Hybrid precoding energy efficiency optimization method of millimeter wave MIMO-OFDM communication system | |
| CN101682475B (en) | Method and apparatus for controlling multi-antenna transmission in a wireless communication network | |
| US20040047426A1 (en) | Multi input multi output wireless communication method and apparatus providing extended range and extended rate across imperfectly estimated channels | |
| WO2012021449A1 (en) | Sub-band feedback for beamforming on downlink multiple user mimo configurations | |
| CN102124683B (en) | System and method for quantization of channel state information | |
| WO2011159800A1 (en) | Alternate feedback types for downlink multiple user mimo configurations | |
| CN108880774A (en) | Frequency division duplex multi-user large-scale multi-antenna system and its down-bound pilot frequency signal Design of length method | |
| CN105933046B (en) | A kind of extensive antenna system base band and radio frequency mixing method for precoding | |
| CN104871437A (en) | Channel reciprocity compensating method and device in FDD system | |
| CN101626265A (en) | Method for realizing downlink beam forming in wireless communication system | |
| CN102468947A (en) | Feedback method and equipment for signal channel quality information | |
| CN103428125A (en) | Method, related device and system for correcting channels among far-end radio frequency units | |
| CN110113087A (en) | Method for precoding under security multicast scene based on man-made noise in the modulation of direction | |
| CN102687409A (en) | Method and device for generating precoding matrix codebook | |
| CN108712198B (en) | Mixed precoding method based on sub-band equivalent channel matrix condition number | |
| JP2003309540A (en) | Communication method | |
| CN107094038B (en) | Method, device and system for adjusting power of antenna system | |
| EP2611044B1 (en) | Adaptive transmit beamforming |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201224 Address after: 224300 Sheyang port, Sheyang County, Yancheng City, Jiangsu Province Patentee after: No.2 shrimp culture company, Sheyang port, Sheyang County Address before: 518057 Ministry of justice, Zhongxing building, South Science and technology road, Nanshan District hi tech Industrial Park, Shenzhen, Guangdong Patentee before: ZTE Corp. |