US9270501B2 - Method for removing signal interference based on multiple input multiple output - Google Patents
Method for removing signal interference based on multiple input multiple output Download PDFInfo
- Publication number
- US9270501B2 US9270501B2 US14/272,973 US201414272973A US9270501B2 US 9270501 B2 US9270501 B2 US 9270501B2 US 201414272973 A US201414272973 A US 201414272973A US 9270501 B2 US9270501 B2 US 9270501B2
- Authority
- US
- United States
- Prior art keywords
- matrix
- receiver
- transmitter
- denotes
- weighted
- 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
Images
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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
-
- 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
- H04L25/03891—Spatial equalizers
- H04L25/03898—Spatial equalizers codebook-based design
- H04L25/0391—Spatial equalizers codebook-based design construction details of matrices
-
- 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
- H04B7/0417—Feedback systems
-
- 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
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/021—Estimation of channel covariance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/024—Channel estimation channel estimation algorithms
- H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
-
- 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
- H04L25/03891—Spatial equalizers
- H04L25/03949—Spatial equalizers equalizer selection or adaptation based on feedback
- H04L25/03955—Spatial equalizers equalizer selection or adaptation based on feedback in combination with downlink estimations, e.g. downlink path losses
-
- 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
Definitions
- the present invention relates to a method for removing signal interference based on MIMO (Multiple Input Multiple Output), and more particularly, to a method for removing interference that is robust to channel estimation error even in an environment of multiple wireless LAN (Local Area Network) APs (Access Points) and wireless terminals.
- MIMO Multiple Input Multiple Output
- APs Access Points
- wireless APs shares the same wireless resources one another in order to maximize efficiency of the wireless resources.
- overall network performance may be deteriorated due to influence caused by inter-user interference and inter-AP interference.
- Korean Laid-Open Patent Publication No. 2012-0127833 discloses an arrangement for acquiring interference channel information between a station (STA) and its adjacent STA which is a frame transmission target of a wireless LAN AP, deciding a transmission beam vector based on the interference channel information, and transmitting data frames to the transmission target STA in a MINO transmission manner based on the transmission beam vector.
- the present invention provides a method for removing signal interference based on MIMO capable of minimizing influence of the interference signal in spite of acquiring incorrect channel information in a network having a plurality of wireless LAN APs.
- a method for removing signal interference in a MIMO-based interference removing apparatus includes transmitting a reference signal to at least one receiver; if channel information is estimated by the receiver, receiving the estimated channel information from the receiver as a feedback signal; producing transmission pre-coding matrix, beam forming matrix, and weighted matrix using the received channel information; and transmitting information containing the transmission pre-coding matrix, the beam forming matrix, and the weighted matrix by including them in a pilot signal to the receiver, wherein the MIMO-based interference removing apparatus comprises at least one transmitter.
- FIG. 1 is a configuration diagram illustrating a system for removing signal interference based on MOMO in accordance with an embodiment of the present invention
- FIG. 2 is a block diagram illustrating an apparatus for removing interference based on MOMO shown in FIG. 1 ;
- FIG. 3 shows a diagram explaining the signal interference occurred in the MIMO-based interference removing system of FIG. 1 ;
- FIG. 4 is a sequential diagram illustrating a process of transmitting and receiving data between components of the MIMO-based interference removing system of FIG. 1 in accordance with an embodiment of the present invention
- FIG. 5 is a flow chart describing a detailed operation in block S 4400 of FIG. 4 ;
- FIG. 6 is a flow diagram illustrating a method for removing signal interference based on MOMO in accordance with an embodiment of the present invention.
- FIG. 1 is a configuration diagram illustrating a system for removing signal interference based on MOMO in accordance with an embodiment of the present invention.
- a MIMO-based interference removing system 1 may include at least one receiver 100 and at least one transmitter 250 .
- the MIMO-based interference removing system 1 shown in FIG. 1 is only an illustrative example, and it is understood that the embodiment of the present invention is not limited to that illustrated in FIG. 1 .
- the respective components of FIG. 1 are typically connected through a network 200 .
- the receiver(s) 100 and the transmitter(s) 250 are connected via the network 200 .
- the network 200 used herein refers to a physical connection topology capable of exchanging information between the respective nodes such as terminals and servers, which may include, e.g., the Internet, LAN (Local Area Network), Wireless LAN (Local Area Network), WAN (Wide Area Network), PAN (Personal Area Network), 3G network, 4G network, LTE network, Wi-Fi network, or the like but is not limited thereto.
- the receiver 100 and the transmitter 250 are also not limited to those illustrated in FIG. 1 .
- the receiver 100 may be, e.g., a wireless terminal. Also, the receiver 100 may be the basis of MIMO antenna.
- the receiver 100 may be implemented by a wireless communication device that ensures portability and mobility, for example, which may include any kind of handheld-based wireless communication devices such as a handset for PCS (Personal Communication System), GSM (Global System for Mobile communications), PDC (Personal Digital Cellular), PHS (Personal Handyphone System), PDA (Personal Digital Assistant), IMT (International Mobile Telecommunication)-2000, CDMA (Code Division Multiple Access)-2000, W-CDMA (W-Code Division Multiple Access), and Wibro (Wireless Broadband Internet), smartphone, smart pad, Tablet PC, or the like.
- PCS Personal Communication System
- GSM Global System for Mobile communications
- PDC Personal Digital Cellular
- PHS Personal Handyphone System
- PDA Personal Digital Assistant
- IMT International Mobile Telecommunication
- CDMA Code Division Multiple Access
- W-CDMA Wide-Code Division Multiple Access
- Wibro Wireless Broadband Internet
- the transmitter may be, for example, a wireless LAN AP or a repeater.
- the transmitter may serve at least one receiver.
- the transmitter 250 may be the basis of a MIMO antenna.
- FIG. 2 is a block diagram illustrating an apparatus for removing signal interference based on MOMO shown in FIG. 1
- FIG. 3 shows a diagram explaining the interference occurred in the MIMO-based interference removing system of FIG. 1
- FIG. 4 is a sequential diagram illustrating a process of transmitting and receiving data between the components of the MIMO-based interference removing system of FIG. 1
- FIG. 5 is a flow chart describing a detailed operation in block S 4400 of FIG. 4 .
- a MOMO-based interference removing apparatus 300 may include a first transmission unit 310 , a receiving unit 330 , a matrix generation unit 350 , and a second transmission unit 370 .
- the MOMO-based interference removing apparatus 300 may be incorporated into the transmitter 250 , may be one of components of the transmitter 250 , or may be a program or an operating system embedded in the transmitter 250 . However, it is not intended to limit the embodiment to the foregoing implements.
- the first transmission unit 310 of the transmitter 250 transmits a reference signal to at least one (hereinafter, referred to as a representative reference numeral 100 ) of the receivers 100 ( 1 ) to 100 (N) (in block S 4100 ).
- the receiving unit 330 receives the estimated channel information as a feedback signal from the receiver 100 (in block S 4300 ).
- the matrix generation unit 350 generates transmission pre-coding matrix, beam forming matrix and weighted matrix (in block S 4400 ). The operation of the matrix generation unit 350 will be explained in detail with reference to FIG. 5 as follows. Specifically, the matrix generation unit 350 initializes the transmission pre-coding matrix with respect to the transmitter 250 and the receiver 100 (in block S 4410 ) and calculates the beam forming matrix with respect to the transmitter 250 and the receiver 100 (in block S 4420 ).
- the beam forming matrix may be calculated by the following Equation 1.
- U [k,i] ⁇ [k,i] ⁇ 1 H i [k,i] V [k,i] [EQUATION 1] wherein ⁇ [k,i] represents a covariance matrix of the signal that is received by any one of the receivers 100 , H i [k,i] represents a channel matrix between any one of the transmitters 250 and any one of receivers 100 , V [k,i] represents a transmission ore-coding matrix for any one of the receivers 100 .
- the Equation 1 is intended for minimizing MSE (Mean Square Error).
- the channel matrix may be calculated by the following Equation 2.
- an i-th transmitter 250 ( i ) has M i antennas and supports K i receivers having N i antennas.
- a k-th terminal (or receiver) that is supported by a j-th transmitter 300 ( j ) is expressed as [k,i].
- H i [k,i] represents a channel matrix between i-th transmitter 250 ( i ) and a receiver 100 [k,j].
- H i [k,j] ⁇ tilde over (H) ⁇ i [k,j] + ⁇ i [k,j] [EQUATION 2]
- ⁇ tilde over (H) ⁇ i [k,j] denotes an estimated channel matrix
- ⁇ i [k,j] denotes a channel estimation error matrix
- the elements of the channel matrix and the channel estimation error matrix are complex Gaussian random variables whose mean is zero (0) and variance is ⁇ e 2 .
- the covariance matrix of the signal that is received by the receiver [k,j] may be calculated by the following Equation 3.
- ⁇ [ k , i ] ( ⁇ n 2 + ⁇ e 2 ⁇ ⁇ ( 1 , j ) ⁇ tr ⁇ ⁇ V [ 1 , j ] ⁇ V [ 1 , j ] ⁇ H ⁇ ) ⁇ I + ⁇ ( 1 , j ) ⁇ H j [ k , i ] ⁇ V [ 1 , j ] ⁇ V [ 1 , j ] ⁇ H ⁇ H j [ k , i ] ⁇ H [ EQUATION ⁇ ⁇ 3 ] where ⁇ e 2 denotes a variance value of noise influenced on the receiver 100 .
- the pre-coding matrix that is used to minimize the weighted sum MSE may be derived through the Lagrange Multiplier Method.
- the transmission pre-coding matrix can be calculated by two methods as follows. A first method is a case where a transmission power of any one of the transmitters 250 is constrained whereas a second method is a case where a transmission power of any one of the receivers 100 is constrained.
- the transmission pre-coding matrix is calculated by the following Equation 5.
- V [ k , i ] ⁇ ( ⁇ ( i , j ) ⁇ ⁇ [ 1 , j ] ⁇ H ⁇ i [ 1 , j ] ⁇ H ⁇ U [ 1 , j ] ⁇ W [ 1 , j ] ⁇ U [ 1 , j ] ⁇ H ⁇ H ⁇ i [ 1 , j ] + ⁇ e 2 ⁇ ⁇ ( i , j ) ⁇ ⁇ [ 1 , j ] ⁇ tr ⁇ ⁇ W [ 1 , j ] ⁇ U [ 1 , j ] ⁇ H ⁇ U [ 1 , j ] ⁇ ⁇ I + ⁇ i ⁇ I ) - 1 ⁇ ⁇ [ k , i ] ⁇ H ⁇ i [ k , i ] ⁇ H ⁇ U [ k , i ] ⁇ W [ k , i ] [
- ⁇ k 1 K i ⁇ tr ⁇ ⁇ V [ k , i ] ⁇ V [ k , i ] ⁇ H ⁇ ⁇ P i ; and P i denotes an upper limit of the transmission power of any one of the transmitters 250 .
- the transmission pre-coding matrix is calculated by the following Equation 6.
- V [ k , i ] ( ⁇ ( i , j ) ⁇ ⁇ [ 1 , j ] ⁇ H ⁇ i [ 1 , j ] ⁇ H ⁇ U [ 1 , j ] ⁇ W [ 1 , j ] ⁇ U [ 1 , j ] ⁇ H ⁇ H ⁇ i [ 1 , j ] + K i P i ⁇ ⁇ e 2 ⁇ tr ⁇ ⁇ ⁇ [ k , i ] ⁇ W [ k , i ] ⁇ U [ k , i ] ⁇ H ⁇ U [ k , i ] ⁇ I + ⁇ e 2 ⁇ ⁇ ( 1 , j ) ⁇ tr ⁇ ⁇ ⁇ ⁇ [ 1 , j ] ⁇ W [ 1 , j ] ⁇ U [ 1 , j ] ⁇ H ⁇ U [ 1 , j ]
- the second transmission unit 370 may transmit information including the beam forming matrix and the weighted matrix by the inclusion of the information in a pilot signal.
- the receiver 100 Upon receipt of the pilot signal, the receiver 100 produces a received beam forming matrix and transmit the same to the transmitter 250 .
- the aforementioned processes are performed iteratively, thereby locating a point of convergence.
- the weighted matrix is calculated with respect to the transmitter 250 and the receiver 100 (in block S 4430 ), the transmission pre-coding matrix is calculated in case of constraining the transmission power of any one of the transmitters 250 or the transmission pre-coding matrix is calculated in case of constraining the transmission power of any one of the receivers 100 (in block S 4440 ).
- the calculations are repeated until the weighted sum MSE of the weighted matrix converges on a predetermined threshold value (in block S 4450 ), and a final matrix may then be produced (in block S 4460 ).
- a predetermined threshold value in block S 4450
- the transmitter 250 transmits the beam forming matrix and the weighted matrix by including them in the pilot signal as a feedback signal to the receiver 100 (in block S 4500 ).
- FIG. 6 is a flow diagram illustrating a method for removing signal interference based on MIMO in accordance with an embodiment of the present invention.
- the MIMO based interference removing apparatus transmits a reference signal to the receiver (in block S 6100 ).
- the MIMO based interference removing apparatus receives the estimated channel information that is estimated in the receiver as a feedback signal from the receiver (in block S 6200 ).
- the MIMO based interference removing apparatus then produces the transmission pre-coding matrix, the beam forming matrix and the weighted matrix using the received channel information (in block S 6300 ), and transmits information including the beam forming matrix and the weighted matrix by the inclusion of them in the pilot signal to the receiver (in block S 6400 ).
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Radio Transmission System (AREA)
Abstract
Description
U [k,i]=Φ[k,i]−1 H i [k,i] V [k,i] [EQUATION 1]
wherein Φ[k,i] represents a covariance matrix of the signal that is received by any one of the
H i [k,j] ={tilde over (H)} i [k,j]+Δi [k,j] [EQUATION 2]
where {tilde over (H)}i [k,j] denotes an estimated channel matrix, Δi [k,j] denotes a channel estimation error matrix, the elements of the channel matrix and the channel estimation error matrix are complex Gaussian random variables whose mean is zero (0) and variance is σe 2.
where σe 2 denotes a variance value of noise influenced on the
W [k,i]=(I−V [k,i]H {tilde over (H)} i [k,i]HΦ[k,i]−1 {tilde over (H)} i [k,i] V [k,i])−1 [EQUATION 4]
where W[k,i] denotes the weighted matrix.
where μ[k,i] denotes the priority of any one of the
and Pi denotes an upper limit of the transmission power of any one of the
where β denotes a power normalization factor and Ki denotes the number of the
Claims (10)
U [k,i]=Φ[k,i]−1 H i [k,i] V [k,i]
H i [k,j] ={tilde over (H)} i [k,j]+Δi [k,j]
W [k,i]=(I−V [k,i]H {tilde over (H)} i [k,i]HΦ[k,i]−1 {tilde over (H)} i [k,i] V [k,i])−1
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020130166381A KR102235686B1 (en) | 2013-12-30 | 2013-12-30 | Method for eliminating signal interference based on multiple input multiple output |
KR10-2013-0166381 | 2013-12-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20150188733A1 US20150188733A1 (en) | 2015-07-02 |
US9270501B2 true US9270501B2 (en) | 2016-02-23 |
Family
ID=53483155
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/272,973 Active US9270501B2 (en) | 2013-12-30 | 2014-05-08 | Method for removing signal interference based on multiple input multiple output |
Country Status (2)
Country | Link |
---|---|
US (1) | US9270501B2 (en) |
KR (1) | KR102235686B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10897277B2 (en) | 2017-12-11 | 2021-01-19 | Electronics And Telecommunications Research Institute | Method for estimating self-interference signal based on iterative estimation and apparatus using the same |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107615694B (en) * | 2015-06-17 | 2021-02-05 | 苹果公司 | Method and precoding module for determining a precoding matrix |
KR20170118527A (en) | 2016-04-15 | 2017-10-25 | 삼성전자주식회사 | Electronic apparatus and controlling method of thereof |
KR101965542B1 (en) * | 2018-11-30 | 2019-08-13 | 세종대학교산학협력단 | Multi user-multiple input multiple output downlink system and transmission rate improvement method using multidimensional |
KR102262392B1 (en) * | 2019-06-25 | 2021-06-08 | 인하대학교 산학협력단 | Method and apparatus of massive mimo detection based on deep neural network |
KR102107571B1 (en) * | 2019-06-25 | 2020-05-07 | 인하대학교 산학협력단 | Method and apparatus of massive mimo detection based on deep neural network |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090046788A1 (en) * | 2007-08-13 | 2009-02-19 | Kotecha Jayesh H | Techniques for Reducing Precoding Overhead in a Multiple-Input Multiple-Output Wireless Communication System |
KR20090073758A (en) | 2007-12-31 | 2009-07-03 | 엘지전자 주식회사 | A method for receiving a precoded signal in collaborative multiple input multiple output communication system |
US20090262719A1 (en) * | 2008-04-16 | 2009-10-22 | Samsung Electronics Co., Ltd. | Apparatuses and methods for beamforming in a multiple input multiple output (MIMO) wireless communication system based on hybrid division duplex |
KR20100021966A (en) | 2008-08-18 | 2010-02-26 | 한국전자통신연구원 | Communication system including basestations and terminal for multi-cell cooperative communication |
US20100234054A1 (en) | 2009-03-11 | 2010-09-16 | Electronics And Telecommunications Research Institute | System for controlling inter cell interference in cellular mobile system |
US20110142154A1 (en) | 2009-12-16 | 2011-06-16 | Electronics And Telecommunications Research Institute | Sequential transmission multi-beamforming method with low complexity using hadamard matrix |
KR20110068755A (en) | 2009-12-16 | 2011-06-22 | 한국전자통신연구원 | Sequential transmit multi-beamforming method with low complexity using hadamard matrix |
KR20110119520A (en) | 2010-04-26 | 2011-11-02 | 엘지전자 주식회사 | Method for avoiding interference in wireless communication system and apparatus for the same |
US20120177142A1 (en) | 2009-07-21 | 2012-07-12 | St-Ericsson Sa | Precoding process for a transmitter of a mu-mimo communication sytstem |
JP2012186631A (en) | 2011-03-04 | 2012-09-27 | Ntt Docomo Inc | Mobile terminal device, radio base station device, and radio communication method |
US20120294170A1 (en) | 2011-05-16 | 2012-11-22 | Electronics And Telecommunications Research Institute | Method for transmitting frame with interference avoidance in wireless local area network system and appratus for the same |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8014265B2 (en) * | 2007-08-15 | 2011-09-06 | Qualcomm Incorporated | Eigen-beamforming for wireless communication systems |
KR101424697B1 (en) * | 2007-09-03 | 2014-08-05 | 삼성전자주식회사 | Apparatus and method for signal processing to eliminate interference in multi-user multiple input multiple output wireless communication system |
KR101478277B1 (en) * | 2008-05-03 | 2014-12-31 | 인텔렉추얼디스커버리 주식회사 | Method for Transmitting Frame Using Precoding for Supporting MU-MIMO and Base Station for Supporting That Method |
-
2013
- 2013-12-30 KR KR1020130166381A patent/KR102235686B1/en active IP Right Grant
-
2014
- 2014-05-08 US US14/272,973 patent/US9270501B2/en active Active
Patent Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090046788A1 (en) * | 2007-08-13 | 2009-02-19 | Kotecha Jayesh H | Techniques for Reducing Precoding Overhead in a Multiple-Input Multiple-Output Wireless Communication System |
KR20090073758A (en) | 2007-12-31 | 2009-07-03 | 엘지전자 주식회사 | A method for receiving a precoded signal in collaborative multiple input multiple output communication system |
US20100309998A1 (en) | 2007-12-31 | 2010-12-09 | Lg Electronics Inc. | Method for transmitting precoded signal in collaborative multiple-input multiple-output communication system |
US20090262719A1 (en) * | 2008-04-16 | 2009-10-22 | Samsung Electronics Co., Ltd. | Apparatuses and methods for beamforming in a multiple input multiple output (MIMO) wireless communication system based on hybrid division duplex |
US20110151918A1 (en) | 2008-08-18 | 2011-06-23 | Electronics And Telecommunications Research Institute | Communication system including base stations and terminal for multi-cell cooperative communication |
KR20100021966A (en) | 2008-08-18 | 2010-02-26 | 한국전자통신연구원 | Communication system including basestations and terminal for multi-cell cooperative communication |
KR20120086279A (en) | 2008-08-18 | 2012-08-02 | 한국전자통신연구원 | Communication system including basestations and terminal for multi-cell cooperative communication |
US20100234054A1 (en) | 2009-03-11 | 2010-09-16 | Electronics And Telecommunications Research Institute | System for controlling inter cell interference in cellular mobile system |
KR20100102564A (en) | 2009-03-11 | 2010-09-24 | 한국전자통신연구원 | System for controlling inter cell interference in cellular mobile system |
US20120177142A1 (en) | 2009-07-21 | 2012-07-12 | St-Ericsson Sa | Precoding process for a transmitter of a mu-mimo communication sytstem |
KR20110068755A (en) | 2009-12-16 | 2011-06-22 | 한국전자통신연구원 | Sequential transmit multi-beamforming method with low complexity using hadamard matrix |
US20110142154A1 (en) | 2009-12-16 | 2011-06-16 | Electronics And Telecommunications Research Institute | Sequential transmission multi-beamforming method with low complexity using hadamard matrix |
KR20110119520A (en) | 2010-04-26 | 2011-11-02 | 엘지전자 주식회사 | Method for avoiding interference in wireless communication system and apparatus for the same |
JP2012186631A (en) | 2011-03-04 | 2012-09-27 | Ntt Docomo Inc | Mobile terminal device, radio base station device, and radio communication method |
US20140003272A1 (en) | 2011-03-04 | 2014-01-02 | Ntt Docomo, Inc. | Mobile terminal apparatus, radio base station apparatus and radio communication method |
US20120294170A1 (en) | 2011-05-16 | 2012-11-22 | Electronics And Telecommunications Research Institute | Method for transmitting frame with interference avoidance in wireless local area network system and appratus for the same |
KR20120127833A (en) | 2011-05-16 | 2012-11-26 | 한국전자통신연구원 | Method for transmitting frame with interference avoidance in wireless local area network and appratus for the same |
Non-Patent Citations (2)
Title |
---|
Tajer, Ali et al., "Robust Linear Precoder Design for Multi-Cell Downlink Transmission," IEEE Transactions on Signal Processing, vol. 59(1):235-251 (2011). |
Vucic, Nikola et al., "Robust Transceiver Optimization in Downlink Multiuser MIMO Systems," IEEE Transactions on Signal Processing, vol. 57(9):3576-3587 (2009). |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10897277B2 (en) | 2017-12-11 | 2021-01-19 | Electronics And Telecommunications Research Institute | Method for estimating self-interference signal based on iterative estimation and apparatus using the same |
Also Published As
Publication number | Publication date |
---|---|
US20150188733A1 (en) | 2015-07-02 |
KR102235686B1 (en) | 2021-04-06 |
KR20150080049A (en) | 2015-07-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9270501B2 (en) | Method for removing signal interference based on multiple input multiple output | |
EP2515450B1 (en) | Method and device for pre-coding, and method and device for decoding | |
TWI475825B (en) | Method for beamforming transmissions from a network element having a plurality of antennas, and the network element | |
CN104868947A (en) | Method of realizing beam forming and base station | |
US10231249B2 (en) | Method for transmitting signal through energy efficiency optimization and base station | |
US10057799B2 (en) | Channel measurement method, channel measurement apparatus, user equipment, and system | |
US20170012729A1 (en) | Timing acquisition techniques for mobile station in wireless network | |
US20220407616A1 (en) | Method for predicting channel state information and apparatus | |
US8750400B2 (en) | Method and system for an iterative multiple user multiple input multiple output (MU-MIMO) communication system | |
US9807702B2 (en) | Precoding method and apparatus for heterogeneous network coordinated multi-point transmission | |
US8929390B2 (en) | Methods and apparatuses for channel estimation in wireless networks | |
KR101998998B1 (en) | Signal processing method and apparatus for multi-antenna multiple source and multiple destination via relay communication system | |
US11115240B2 (en) | Methods, apparatuses, and systems for performing analog CSI feedback | |
EP4164137A1 (en) | Computation of beamforming parameters | |
CN102983933A (en) | Method and device and system of signal transmission and signal decoding | |
US8811455B2 (en) | System and method for performing weighted processing on down link signal | |
Turgut et al. | Average error probability analysis in mmWave cellular networks | |
US20130083863A1 (en) | Apparatus and method for low complexity feedback in a mimo wireless network | |
US11936453B2 (en) | Forward predictive precoded MIMO | |
EP4340247A1 (en) | Determining covariance using a lossy compression method | |
EP4319070A1 (en) | Artificial intelligence-based channel estimation method and apparatus | |
CN116566447A (en) | Communication method and device | |
CN114915522A (en) | Millimeter wave large-scale MIMO channel estimation method based on CFISTA-NET | |
KR20230097696A (en) | Rate-splitting multiple access method for the base station with limited energy supply to maximize the sum rate based on deep reinforcement learning | |
KR20160080039A (en) | Beam Forming Method for Cooperative Relay with Applying of Interference Source Effects in Wireless Communication System |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTIT Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OH, JINHYUNG;KO, GWANGZEEN;KIM, IGOR;AND OTHERS;SIGNING DATES FROM 20140501 TO 20140502;REEL/FRAME:032851/0632 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YR, SMALL ENTITY (ORIGINAL EVENT CODE: M2551); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY Year of fee payment: 4 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 8TH YR, SMALL ENTITY (ORIGINAL EVENT CODE: M2552); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY Year of fee payment: 8 |