KR101580539B1 - Two-way communication system and method for multiuser - Google Patents
Two-way communication system and method for multiuser Download PDFInfo
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- KR101580539B1 KR101580539B1 KR1020140130079A KR20140130079A KR101580539B1 KR 101580539 B1 KR101580539 B1 KR 101580539B1 KR 1020140130079 A KR1020140130079 A KR 1020140130079A KR 20140130079 A KR20140130079 A KR 20140130079A KR 101580539 B1 KR101580539 B1 KR 101580539B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0026—Interference mitigation or co-ordination of multi-user interference
- H04J11/0036—Interference mitigation or co-ordination of multi-user interference at the receiver
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Abstract
Description
The present invention relates to a two-way communication system and a two-way communication method for a plurality of users.
Recently, a system supporting bi-directional communication among a large number of users has emerged as an attractive solution for maximizing the efficiency of radio resources. A plurality of wireless terminals in a bi-directional communication system environment can transmit and receive data in relation to a base station utilizing the same radio resource (e.g., time, frequency, or code), thereby increasing data throughput.
In this system, the two-way communication base station provides a full duplexer for a plurality of users, and the full duplexer supports multiple input and multiple output (MIMO) for a plurality of users. However, since the bidirectional communication base station transmits a signal to a plurality of downlink users through a downlink channel and receives signals from a plurality of uplink users through an uplink channel, self-interference Self-Interference) is generated. Therefore, there is a continuing need for a method for effectively mitigating or eliminating self-interference in a two-way communication system and a method for designing an antenna accordingly.
The following are research papers on various methods to solve self interference problem in bidirectional communication system.
Real-time, Full Duplex Wireless ", MobiCom" Real-time, Full-duplex Wireless ", M. Jain, J. Choi, T. Kim, D. Bharadia, S. Seth, K. Srinivasan, P. Levis, S. Katti, 11, September 1923, 2011, Las Vegas, Nevada, USA.
This paper proposes a prototype of a full - duplex wireless communication system using OFDM link layer such as 802.11 in the design of IBFD, and proposed a system model that reduces its own interference using signal inversion and adaptation cancellation techniques.
A. Sabharwal, P. Schniter, D. Guo, D. Bliss, S. Rangarajan, and R. Wichman, "In-Band Full-Duplex Wireless: Challenges and Opportunities", November 3, 2013, http: // arxiv. org / abs / 1311.0456v3.
This paper discusses various mitigation techniques for magnetic interference, one of the most substantial problems of the IBFD, and other research topics for the design and analysis of IBFD radio systems.
Some embodiments of the present invention provide a bi-directional communication system for a plurality of users capable of efficiently removing a self interference signal generated by transmission of a downlink signal upon reception of an uplink signal in a two-way communication system for a plurality of users, The present invention provides a two-way communication method.
It is to be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may be present.
According to an aspect of the present invention, there is provided a base station supporting bidirectional communication for a plurality of users, the base station including a plurality of antennas for transmitting downlink signals to the plurality of users, A transmitter for applying a precoding matrix to the downlink signal; And a receiver coupled to the plurality of antennas for receiving uplink signals from the plurality of users, respectively, and applying a beamforming filter to the uplink signals.
In this case, the precoding matrix may include a plurality of self interference signals generated by transmission of the downlink signal upon reception of the uplink signal as the reception of the uplink signal and the transmission of the downlink signal occur simultaneously, Wherein the beamforming filter includes a self interference cancellation filter arranged in a predetermined specific subspace in relation to the specific subspace.
In another aspect of the present invention, there is provided a bi-directional communication method for a plurality of users, comprising the steps of: before transmitting a downlink signal to a plurality of users through a plurality of antennas connected to a transmitter of a base station, Applying a precoding matrix to the matrix; And applying a beamforming filter to the uplink signal after receiving an uplink signal from the plurality of users via a plurality of antennas connected to a receiver of the base station, In response to reception of the uplink signal and transmission of the downlink signal, a plurality of self interference signals generated by transmission of the downlink signal upon reception of the uplink signal, Wherein applying the beamforming filter comprises applying a self interference cancellation filter consisting of a null space of the specific subspace.
According to any one of the above-described methods of the present invention, a precoding matrix including a self-interference alignment matrix is applied to a downlink signal before transmitting a downlink signal, and after a uplink signal is received, By applying a beam-forming filter including a self-interference elimination filter to the link signal, it is possible to remove the self-interference signal due to simultaneous transmission and reception of signals, and efficiently detect the uplink and downlink signals required for bidirectional communication And the overall performance of the MIMO system for a large number of users can be improved.
In addition, by applying the user interference alignment matrix to the precoding matrix additionally, an inter-user interference signal that can occur when the first channel corresponding to the first user and the second channel corresponding to the second user are adjacent to each other in the downlink channel, Can be removed. By applying an optimization matrix to the precoding matrix, it is also possible to set the data rate of a plurality of users in the downlink channel to be the maximum.
FIG. 1 is a general view of a two-way communication system for a plurality of users according to an embodiment of the present invention.
2 is a block diagram of a base station supporting two-way communication for a plurality of users according to an embodiment of the present invention.
3 is a diagram illustrating an example of a process of obtaining a self-interference alignment matrix.
4 is a flowchart illustrating a two-way communication method for a plurality of users according to an exemplary embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.
Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
In this specification, some of the operations or functions described as being performed by the terminal or the device may be performed in the server connected to the terminal or the device instead. Similarly, some of the operations or functions described as being performed by the server may also be performed on a terminal or device connected to the server.
The following examples are intended to further illustrate the present invention and are not intended to limit the scope of the present invention. Accordingly, the same scope of the invention performing the same function as the present invention will also fall within the scope of the present invention.
FIG. 1 is a general view of a two-way communication system for a plurality of users according to an embodiment of the present invention.
The bidirectional communication system 10 of the present invention includes a
The
The Nt transmission
In this case, the number of transmission
A plurality of
The plurality of
The self interference (SI) is transmitted from the transmission
In a two-way communication system 10 for a plurality of users according to an exemplary embodiment of the present invention, a plurality of
A plurality of
In addition, the
2 is a block diagram of a base station supporting two-way communication for a plurality of users according to an embodiment of the present invention.
2, a
Since the base station supporting two-way communication for a plurality of users shown in FIG. 2 is only one embodiment of the present invention, the present invention is not limited to FIG. 2, and various applications are possible from FIG.
The
The transmission
The receiving
That is, a plurality of transmission
In this case, a plurality of antennas generally refers to a MIMO (Multiple Input Multiple Output) antenna, and two or more antennas may be arranged at both ends of the transmission
In addition, multiple antennas may be generated by transmission of a downlink signal upon receipt of an uplink signal as the uplink signal is received and the downlink signal is simultaneously transmitted through a separate device connected thereto or its own optimization design scheme A plurality of self interference signals can be removed.
The
In this case, the precoding matrix may include a plurality of self interference signals generated by transmission of a downlink signal upon receipt of an uplink signal as a result of reception of an uplink signal and transmission of a downlink signal at the same time, Lt; RTI ID = 0.0 > a < / RTI > specific subspace.
Also, the precoding matrix may further include a user interference alignment matrix set based on a block diagonalization technique to remove a plurality of inter-user interference signals generated by transmission of a downlink signal. At this time, the user interference sorting matrix may be applied to the downlink signal before the self interference sorting matrix.
Further, the precoding matrix further includes an optimization matrix based on a user interference sorting matrix and a singular value decomposition process for a self-interference sorting matrix so as to maximize a data rate of a plurality of users when transmitting a downlink signal . At this time, the optimization matrix may be applied to the downlink signal later than the user interference alignment matrix and the self interference interference sorting matrix.
In other words, the precoding matrix applied to the multiple transmit
[Equation 1] is a formula for obtaining a precoding matrix, and a specific process will be described.
In Equation (1)
Is a user interference alignment matrix set on the basis of a block diagonalization technique and removes a plurality of inter-user interference signals generated by transmission of a downlink signal.In order to obtain the user interference sorting matrix, first, a block diagonalization technique is applied
So that the signals of the respective downlink users remain in the null space of the downlink user.Next,
(SVD) in a way that decomposes a signal into a specific structure frequently used in fields such as signal processing and statistics Can be obtained as follows.Next, a user interference sorting matrix satisfying the condition of the foaming forcing
Can be obtained.In Equation (1)
A plurality of self interference signals generated by transmission of a downlink signal upon reception of an uplink signal as a result of reception of an uplink signal and transmission of a downlink signal at the same time, Align to a specific subspace.In order to obtain the self-interference alignment matrix, first,
(301) (span).3 is a diagram illustrating an example of a process of obtaining a self-interference alignment matrix.
Referring to FIG. 3, first, K d1 self-interference signals
(301) In order to satisfy the condition of span as shown in Fig. (Right Null Space) of the selfIn Equation (1)
Is a matrix that optimizes the data rate of the downlink users and can be set based on the disassociation disassembly process for the user interference sort matrix and the self interference sort matrix so as to maximize the data ratio of a plurality of users when transmitting the downlink signal , And to maximize the data rate. Can be obtained.Referring again to FIG. 2, the
At this time, the beamforming filter includes a self interference cancellation filter consisting of the null space of the specific subspace referred to in the self interference interference matrix in the precoding matrix.
Further, the beamforming filter may further include a zero-forcing filter for decoding the uplink signal, and the zero-forcing filter may be applied to the uplink signal later than the self interference elimination filter.
Equation (2) is a formula for applying a beam-forming filter, and a concrete procedure will be described.
In Equation (2)
Is an interference cancellation filter for eliminating self-interference caused by a downlink in uplink reception, and the uplink signal received from a plurality of users Satisfy the condition of Lt; RTI ID = 0.0 > 301 < / RTI & It is possible to eliminate the self interference.In Equation (2)
Is a zero forcing filter for decoding signals of uplink users This can be expressed as follows.4 is a flowchart illustrating a two-way communication method for a plurality of users according to an exemplary embodiment of the present invention.
In step S410, the base station applies a precoding matrix to the downlink signals before transmitting the downlink signals to the plurality of users through a plurality of antennas connected to the transmitter of the base station, respectively.
In applying the precoding matrix, as the reception of the uplink signal and the transmission of the downlink signal are simultaneously performed in the base station, a plurality of self interference signals generated by the transmission of the downlink signal upon reception of the uplink signal, And applies a self-interference sorting matrix that aligns to a predetermined specific subspace in relation to the received signal.
In this case, a user interference alignment matrix set based on a block diagonalization scheme is additionally applied to remove a plurality of inter-user interference signals generated by transmission of a downlink signal, and a user interference alignment matrix is defined as a self- It can be applied to the downlink signal before.
In addition, an optimization matrix is additionally applied based on a user interference sorting matrix and a self-interference sorting matrix based on a singular value decomposition process to maximize a data ratio of a plurality of users when a downlink signal is transmitted, May be applied to the downlink signal later than the user interference alignment matrix and the self interference sorting matrix
After receiving an uplink signal from a plurality of users through a plurality of antennas connected to a receiver of the base station, the base station applies a beamforming filter to the uplink signals at step S420.
In applying the beamforming filter, the base station applies its own interference elimination filter consisting of null space of a specific subspace.
At this time, a zero-forcing filter for decoding the uplink signal is additionally applied, and the zero-forcing filter can be applied to the uplink signal later than the self interference elimination filter.
In the above description, steps S410 to S420 may be further divided into additional steps, or combined in fewer steps, according to an embodiment of the present invention. Also, some of the steps may be omitted as necessary, and the order between the steps may be changed.
Through these steps S410 to S420, it is possible to remove the self-interference signal due to simultaneous signal transmission and reception, efficiently detect the uplink and downlink signals required for bidirectional communication, Can be improved.
The two-way communication method for multiple users described with reference to FIG. 4 may also be implemented in the form of a recording medium including instructions executable by a computer, such as program modules, being executed by a computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer-readable medium may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.
It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.
It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .
10: Two-way communication system for multiple users
100: base station 102: transmission multiple antennas
103: receive multiple antenna 104: downlink user terminal
105: Uplink user terminal 107: Self-interference channel
108: downlink channel 109: uplink channel
Claims (7)
A transmitter connected to a plurality of antennas that respectively transmit downlink signals to the plurality of users, and applying a precoding matrix to the downlink signals; And
And a receiver coupled to the plurality of antennas for receiving the uplink signals from the plurality of users and applying a beamforming filter to the uplink signals,
Wherein the precoding matrix includes a plurality of self interference signals generated by transmission of the downlink signal upon receipt of the uplink signal as the reception of the uplink signal and the transmission of the downlink signal are simultaneously performed, A user interference sorting matrix based on a block diagonalization scheme for eliminating a plurality of inter-user interference signals generated by transmission of the downlink signal, / RTI >
Wherein the beamforming filter supports bidirectional communication including a self interference cancellation filter of zero space of the specific subspace,
Wherein the user interference ordering matrix is applied to the downlink signal prior to the self-interference sorting matrix.
Wherein the precoding matrix is configured to maximize a data rate of the plurality of users at the time of transmission of the downlink signal by using an optimization matrix based on a singular value decomposition process for the user interference order matrix and the self- Further comprising:
Wherein the optimization matrix is applied to the downlink signal after the user interference ordering matrix and the self interference allocation matrix.
Wherein the beamforming filter further comprises a zero-forcing filter for decoding the uplink signal,
Wherein the zero-forcing filter is applied to the uplink signal later than the self-interference cancellation filter.
Applying a precoding matrix to the downlink signal before transmitting a downlink signal to a plurality of users through a plurality of antennas connected to a transmitter of the base station; And
Applying a beamforming filter to the uplink signal after receiving an uplink signal from the plurality of users through a plurality of antennas connected to a receiver of the base station,
The step of applying the precoding matrix
A plurality of self interference signals generated by transmission of the downlink signal upon reception of the uplink signal as the reception of the uplink signal and the transmission of the downlink signal are concurrently performed, Applying a self interference sorting matrix to the subspace; And
The method of claim 1, further comprising: applying a user interference alignment matrix based on a block diagonalization scheme to remove a plurality of inter-user interference signals generated by transmission of the downlink signal, The method comprising the steps of:
The step of applying the beam-forming filter
And applying a self interference cancellation filter consisting of null space of the specific subspace.
The step of applying the precoding matrix
Applying an optimization matrix based on a singular value decomposition process for the user interference alignment matrix and the self interference interference sorting matrix to maximize a data rate of the plurality of users when transmitting the downlink signal, Further comprising applying an optimization matrix for the downlink signal later than the user interference alignment matrix and the self interference sorting matrix.
The step of applying the beam-forming filter
Applying a zero-forcing filter to decode the uplink signal, and applying the zero-forcing filter to the uplink signal later than the self-interference cancellation filter.
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KR1020140130079A KR101580539B1 (en) | 2014-09-29 | 2014-09-29 | Two-way communication system and method for multiuser |
PCT/KR2015/009249 WO2016052868A1 (en) | 2014-09-29 | 2015-09-02 | Bidirectional communication system and bidirectional communication method for plurality of users |
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KR101948705B1 (en) | 2017-01-25 | 2019-02-15 | 고려대학교 산학협력단 | Apparatus and method for interference cancellation in multiuser system uplink |
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CN105871439B (en) * | 2016-05-31 | 2019-05-14 | 华南理工大学 | A kind of iteration BD method for precoding based on projection operator |
CN114584249B (en) * | 2022-03-02 | 2023-10-17 | 西安电子科技大学 | Interference elimination method for wireless full duplex system |
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KR101670946B1 (en) * | 2010-01-18 | 2016-10-31 | 삼성전자주식회사 | Mrthod for precoding in a mullti cell multi user systems and communication apparatus |
KR101626059B1 (en) * | 2010-09-03 | 2016-05-31 | 삼성전자주식회사 | Bidirectional relay system and method using precoding and beamforming |
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Non-Patent Citations (2)
Title |
---|
Shenghong Li et al.; Linear Transceiver Design for Full-Duplex Multi-User MIMO System; Communications (ICC), 2014 IEEE International Conference on; Page(s): 4921 - 4926; 10-14 June 2014* * |
Yong Zeng et al.; Degrees of Freedom of the Three-User Rank-Deficient MIMO Interference Channel; Wireless Communications, IEEE Transactions on (Volume:13 , Issue:8); Page(s):4179 - 4192; 08 Aug 2014* * |
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KR101948705B1 (en) | 2017-01-25 | 2019-02-15 | 고려대학교 산학협력단 | Apparatus and method for interference cancellation in multiuser system uplink |
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