KR101742421B1 - Method and apparatus for forming transceiving beam to supprot mobility of the transmitter - Google Patents

Method and apparatus for forming transceiving beam to supprot mobility of the transmitter Download PDF

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Publication number
KR101742421B1
KR101742421B1 KR1020160003685A KR20160003685A KR101742421B1 KR 101742421 B1 KR101742421 B1 KR 101742421B1 KR 1020160003685 A KR1020160003685 A KR 1020160003685A KR 20160003685 A KR20160003685 A KR 20160003685A KR 101742421 B1 KR101742421 B1 KR 101742421B1
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South Korea
Prior art keywords
user terminal
user terminals
reception
signal
forming
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KR1020160003685A
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Korean (ko)
Inventor
최완
송호진
강효승
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한국과학기술원
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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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
    • 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
    • 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
    • H04B7/0617—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 for beam forming
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]

Abstract

A transmitting / receiving beam forming method and apparatus for supporting mobility of a transmitting apparatus are disclosed. A method of forming a beam of signals transmitted and received between a base station and a plurality of user terminals for a plurality of user terminals belonging to a base station, Calculating a matrix based on a region of a horizontal incident angle and a normal incident angle at which a signal transmitted from a user terminal is incident through a receive antenna array of a base station, forming a plurality of receive beams based on the calculated matrix, Determining one of the plurality of receive beams to receive a signal from a user terminal for each of the plurality of user terminals, and determining a receive beam for each of the plurality of user terminals, And receiving data from each user terminal.

Figure R1020160003685

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a transmission and reception beamforming method and apparatus for supporting mobility of a transmission apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting / receiving beam forming method and apparatus for providing continuous communication service to a moving transmitting apparatus. More particularly, the present invention relates to a technique for forming a transmission / reception beam for controlling mutual interference between transmission devices in a network environment in which a plurality of transmission devices having mobility transmit signals to a base station at the same time.

In order to maximize the strength of a received signal, a massive multiple input multiple output (MIMO) system considered in a next generation millimeter-wave mobile communication system uses a plurality of antennas intensively installed in a transmitting / . At this time, when the movement of the transmitting apparatus is fixed (i.e., does not move) or moves at a very low speed, a high power gain can be obtained through a plurality of antennas, The interference signal is removed and a multiplexing gain is obtained. In other words, using a huge array of multiple antennas allows data to be transmitted and received at a high data rate.

However, in order to control an interference signal by a plurality of transmission apparatuses through beam forming, it is necessary to perform channel estimation between transmitting and receiving antennas. At this time, when the transmitting apparatus moves at a high speed, the accuracy of channel estimation lowers. As a result, when a beam is formed on the basis of the estimated channel to perform signal processing, a situation occurs in which the interference signal from other transmitting apparatus is not removed. Furthermore, in the case of a giant array antenna system, since a large number of antennas are installed intensively in a transmitter and a receiver, the number of channels to be estimated is very large, which is difficult to implement in a mobile communication system.

Therefore, there is a need for a technique for forming a transmit / receive beam for controlling an interference signal by a plurality of transmitting devices moving without channel estimation.

Korean Patent Laid-Open No. 10-2010-0099452 relates to a communication system and a communication method for performing interference control using a random beamforming technique, and a beamforming method and a communication method for performing beamforming based on precoding matrix and quality information of a desired signal And describes the technique to be performed.

The present invention relates to a technique for forming a transmission / reception beam for controlling an interference signal by transmission devices without channel estimation in a network environment in which user terminals belonging to a base station move.

A method of forming a beam of signals transmitted and received between a base station and a plurality of user terminals for a plurality of user terminals belonging to a base station, Calculating a matrix based on a region of a horizontal incident angle and a normal incident angle at which a signal transmitted from a user terminal is incident through a receive antenna array of a base station, forming a plurality of receive beams based on the calculated matrix, Determining one of the plurality of receive beams to receive a signal from a user terminal for each of the plurality of user terminals, and determining a receive beam for each of the plurality of user terminals, And receiving data from each user terminal.

According to an aspect, forming a plurality of receive beams based on the matrix forms a first receive beam that controls an interfering signal occurring between user terminals as a signal is transmitted at the plurality of user terminals And forming a second receive beam to control an average received Signal-to-Noise Ratio (SNR) of the signal transmitted from the user terminal.

According to another aspect of the present invention, the step of calculating the matrix includes calculating a radius of a circle corresponding to a region where a user terminal exists during a period of time during which the base station and the user terminal communicate with each other based on the position information and the movement speed information, Calculating a range of a horizontal incidence angle and a vertical incidence angle at which a signal transmitted from the user terminal is incident on the reception antenna array of the base station based on the calculated radius of the circle, And calculating the matrix based on a range of normal incidence angles.

According to another aspect, the radius of the circle can be adjusted according to the moving speed information of the user terminal.

According to another aspect, the location information includes GPS coordinate information received from a satellite at a user terminal, and the traveling speed information may be calculated based on a change in the GPS coordinate information as the user terminal moves .

Determining a number of streams to be transmitted in each of the plurality of user terminals based on the position information and the moving speed information; and determining, based on the determined number of streams, The method further comprising:

According to another aspect of the present invention, the step of determining the number of streams to be transmitted includes determining whether or not overlapping between areas in which a plurality of user terminals are present during a time of communicating with the base station determined based on the location information and the moving speed information, The number of streams to be transmitted can be determined based on the property of the beam.

A transmitting / receiving beamforming apparatus for forming a beam of signals to be transmitted / received with a plurality of user terminals, using a position information and a moving speed information of each of the plurality of user terminals, A matrix calculation unit for calculating a matrix based on an incident angle of horizontal incidence and a vertical incidence angle, a reception beam forming unit for forming a plurality of reception beams based on the calculated matrix, A beam determining unit for determining one of the plurality of receiving beams for receiving a signal from each of the plurality of user terminals, and a receiving unit for receiving data from each user terminal through a receiving beam corresponding to each of the determined plurality of user terminals And a data receiving unit.

According to an aspect of the present invention, the reception beam forming unit forms a first reception beam for controlling an interference signal generated between user terminals as a signal is transmitted from the plurality of user terminals, And a second reception beam for controlling a received signal-to-noise ratio (SNR).

According to another aspect of the present invention, the matrix calculation unit calculates a radius of a circle corresponding to a region in which the user terminal exists for a period of time during which the base station and the user terminal communicate with each other based on the positional information and the movement speed information, Calculating a range of a horizontal incidence angle and a range of a normal incidence angle at which a signal transmitted from a user terminal is received through a reception antenna array of the base station based on the range of the horizontal incidence angle and the range of the vertical incidence angle, The matrix can be computed.

According to another aspect, the radius of the circle can be adjusted according to the moving speed information of the user terminal.

According to another aspect of the present invention, the number of streams to be transmitted in each of the plurality of user terminals is determined based on the position information and the moving speed information, and a transmission beam of each user terminal is formed based on the determined number of streams And a transmission beam forming unit.

According to another aspect of the present invention, the transmission beam forming unit is configured to determine whether to overlap between areas in which a plurality of user terminals exist or a property of a reception beam for a period of time during which the base station communicates with the base station, To determine the number of streams to be transmitted.

According to embodiments of the present invention, in a network environment in which user terminals belonging to a base station move, a transmission / reception beam is formed based on position information and moving speed information of a user terminal, so that interference signals Decrease or elimination of the signal, reduce the complexity of the implementation, and provide a stable communication service without interruption of signal reception.

1 is a diagram illustrating a plurality of user terminals belonging to a base station and a base station in an embodiment of the present invention.
2 is a view for explaining a horizontal incidence angle according to a position and a moving speed of a user terminal in an embodiment of the present invention.
3 is a view for explaining a vertical incidence angle according to a position and a moving speed of a user terminal in an embodiment of the present invention.
4 is a flowchart illustrating a method of forming a transmission / reception beam in an embodiment of the present invention.
5 is a block diagram showing a configuration of a transmission / reception beam forming apparatus according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In a network environment in which a base station using a giant array multiple antenna and user terminals belonging to the base station move, a technique for forming a transmission / reception beam for controlling interference by user terminals as user terminals simultaneously transmit signals to the base station . In particular, the present invention relates to a technique for forming a reception beam that reduces or minimizes the influence of an interference signal by user terminals without channel estimation, taking into consideration that channel estimation accuracy is low according to the moving speed of a user terminal.

The transmission and reception beam forming method and apparatus proposed by the present invention can be applied to a millimeter wave mobile communication system, a giant array multi-antenna mobile communication system, a long term evolution (LTE) mobile communication system, (LTE-A) mobile communication system, a high-speed downlink packet access (HSDPA) mobile communication system , A high speed uplink packet access (HSUPA) mobile communication system, and a 3rd generation project partnership 2 (3GPP2, hereinafter referred to as 3GPP2) A high rate packet data (HRPD) mobile communication system, a wideband code division multiple access (WCDMA) mobile communication system of 3GPP2, Cis (3GPP2) Code Division Multiple Access (WCDMA) mobile communication system, IEEE (Institute of Electrical and Electronics Engineers), IEEE (hereinafter referred to as IEEE). The present invention can be applied to various mobile communication systems such as mobile communication systems.

In embodiments of the present invention, a transmit / receive beamforming apparatus that forms a transmit / receive beam that controls interference between user terminals may be performed by a base station. In the embodiments of the present invention, a transmitting apparatus for transmitting a signal is assumed to be a user equipment (UE), a receiving apparatus for receiving a signal is a base station (base station) BS) according to an embodiment of the present invention.

1 is a diagram illustrating a plurality of user terminals belonging to a base station and a base station in an embodiment of the present invention. In Fig. 1, the base station 101 may represent a transmitting / receiving beam forming apparatus.

Referring to FIG. 1, one base station 101 and K user terminals belonging to one base station 101 can configure a wireless network. That is, there may be K user terminals in a coverage that one base station 101 can service. Here, K may mean a natural number of 1 or more.

The base station 101 has N receive antennas, and each of the K user terminals may have M transmit antennas. For example, the kth user terminal may have Mk transmit antennas. Then, the reception signal y at the base station 101 can be expressed by the following equation (1).

Figure 112016003274726-pat00001

In Equation (1)

Figure 112016003274726-pat00002
A channel formed between a k-th user terminal, the base station 101 signal, W k is transmit beamforming matrix, H k is the k-th user terminal and the base station 101 of the k th user terminal to transmit the information, z is a base station (101 Lt; RTI ID = 0.0 > a < / RTI > In Equation 1, channel information H k can be expressed by using a vertical angle of incidence and the horizontal angle of incidence of a signal incident through the receiving antenna array of the base station 101 as shown in Equation 2 below.

Figure 112016003274726-pat00003

In Equation (2), L denotes channel information

Figure 112016003274726-pat00004
Represents the number of paths constituting the path,
Figure 112016003274726-pat00005
The
Figure 112016003274726-pat00006
Of the path
Figure 112016003274726-pat00007
Figure 112016003274726-pat00008
Th < / RTI > path. And,
Figure 112016003274726-pat00009
The vertical incidence angle
Figure 112016003274726-pat00010
And horizontal incidence angle
Figure 112016003274726-pat00011
Denotes a column vector indicating a phase of a signal input to each reception antenna disposed in the base station 101,
Figure 112016003274726-pat00012
Lt; / RTI >
Figure 112016003274726-pat00013
And the horizontal radiation angle
Figure 112016003274726-pat00014
May denote a row vector representing the phase of a signal that is diverted from a transmit antenna.

In the present exemplary embodiments, a calculation process and a method for forming transmission / reception beams for all K user terminals are the same. Therefore, a process of forming a transmission / reception beam at an arbitrary jth user terminal will be described below as an example do.

The signal transmitted from the jth user terminal to the base station 101

Figure 112016003274726-pat00015
When the signal transmitted from the other user terminals to the base station 101 is decoded by the interference signal
Figure 112016003274726-pat00016
(
Figure 112016003274726-pat00017
). ≪ / RTI > Herein, the other user terminals may be configured such that the j < th > user terminal, among the K user terminals,
Figure 112016003274726-pat00018
May refer to a terminal that has transmitted a signal. At this time,
Figure 112016003274726-pat00019
And to form a reception beam for controlling the interference signal without real-time channel estimation.

In Equation (2)

Figure 112016003274726-pat00020
The column space of the base station 101 may be any possible vertical incidence angle at which the signal transmitted from the k < th > user terminal may be incident on the receiving antenna of the base station 101,
Figure 112016003274726-pat00021
And horizontal incidence angle
Figure 112016003274726-pat00022
Generated by
Figure 112016003274726-pat00023
And can belong to a vector space spanning a linear combination of the two. Accordingly, the base station 101
Figure 112016003274726-pat00024
All possible vertical incidence angles based on the position information of the k-th user terminal and the movement speed information
Figure 112016003274726-pat00025
And horizontal incidence angle
Figure 112016003274726-pat00026
And calculates the calculated vertical incidence angle
Figure 112016003274726-pat00027
And horizontal incidence angle
Figure 112016003274726-pat00028
Which can be made within a range of
Figure 112016003274726-pat00029
It is possible to form a reception beam whose interference is controlled without channel estimation. Here, the detailed operation of forming the reception beam will be described later with reference to FIG. 2 and FIG.

FIG. 2 is a view for explaining a horizontal incidence angle according to a position and a moving speed of a user terminal according to an exemplary embodiment of the present invention. And the vertical incidence angle according to the moving speed.

2 and 3, it is assumed that the position of the transmitting / receiving beam forming apparatus 500 is (0, 0, 0) according to a two-dimensional rectangular coordinate system of xyz,

Figure 112016003274726-pat00030
. here,
Figure 112016003274726-pat00031
May represent the difference between the height of the actual transmit beamforming device from the ground and the height between the kth user terminal. At this time, the k th user terminal moves in the xy plane with V k speed, maximum at the position of the k th user terminal
Figure 112016003274726-pat00032
2, the radius 201 of the circle in the xy plane of the signal that can come from the jth user terminal during the time T is given by < RTI ID = 0.0 >
Figure 112016003274726-pat00033
Lt; / RTI > Here, the circle may indicate an area that can exist as the user terminal moves based on the location information and the moving speed information of the user terminal.

Accordingly, the radius of the circle can be adjusted according to the moving speed of the user terminal. For example, if the moving speed is faster than the predetermined reference speed, the area where the user terminal can exist is widened, so that the radius of the circle can be calculated by applying a high weight to the moving speed. If the moving speed is slower than the reference speed, the area where the user terminal can exist becomes narrower, so that the radius of the circle can be calculated by applying a low weight to the moving speed. The operation of calculating the radius of the circle can be performed by the matrix calculation unit 501 of FIG. 5 to be described later.

All possible horizontal angles of the signal that can be received from the kth user terminal along the radius of the circle

Figure 112016003274726-pat00034
Figure 112016003274726-pat00035
Can be calculated as shown in Equation (3) below.

Figure 112016003274726-pat00036

In Equation (3), the range of the horizontal incidence angle

Figure 112016003274726-pat00037
And horizontal incidence center angle
Figure 112016003274726-pat00038
Can be calculated based on the following equation (4).

Figure 112016003274726-pat00039

3, all possible vertical angles of a signal that may come from the jth user terminal during T time

Figure 112016003274726-pat00040
Can be calculated as shown in Equation (5) below.

Figure 112016003274726-pat00041

In Equation (5), the range of the vertical incidence angle

Figure 112016003274726-pat00042
And vertical incidence center angle
Figure 112016003274726-pat00043
Can be calculated based on Equation (6) below.

Figure 112016003274726-pat00044

All possible vertical incidence angles of the signal received from the moving kth user terminal

Figure 112016003274726-pat00045
And horizontal incidence angle
Figure 112016003274726-pat00046
Which indicates the degree of phase delay of a signal received by the receiving antenna
Figure 112016003274726-pat00047
May be generated,
Figure 112016003274726-pat00048
A matrix for receiving beamforming using vector space of < RTI ID = 0.0 >
Figure 112016003274726-pat00049
Can be calculated. Here,
Figure 112016003274726-pat00050
Will be described later with reference to Fig. 4 and Fig.

2 and 3, the radius 201 of the circle in the xy plane of the signal that can come from the jth user terminal during T time is calculated, and a horizontal incidence angle and a range of vertical incidence angles The region of the signal that can be received from the user terminal may be represented by an ellipse in addition to the circle. For example, the base station may set an area where the user terminal may exist based on the location information of the user terminal and the moving speed information as an ellipse, and calculate the lengths of the major and minor axes of the ellipse. Then, the range of the horizontal incidence angle and the vertical incidence angle may be calculated based on the lengths of the long and short axes of the ellipse.

FIG. 4 is a flowchart illustrating a method of forming a transmission / reception beam in an embodiment of the present invention, and FIG. 5 is a block diagram illustrating a configuration of a transmission / reception beamforming apparatus according to an embodiment of the present invention.

Each of the steps 410 to 460 in FIG. 4 includes a matrix calculation unit 501, a reception beam forming unit 502, a beam determination unit 503, a data reception unit 504, May be performed by the forming portion 505. In FIG. 4, the operation of forming a transmission / reception beam can be performed by the transmission / reception beamforming apparatus 500 corresponding to the base station 101 to which K user terminals belong.

In step 410, the matrix calculator 501 calculates a matrix of the received signal using the position information of the user terminal and the moving speed information, Can be calculated.

In step 411, the matrix calculator 501 may calculate a radius of a circle corresponding to an area where each user terminal exists based on the location information and the moving speed information of the user terminal for the matrix calculation. Here, the location information of the user terminal may include GPS information that the user terminal has received from the satellite. The moving speed information can be calculated at the user terminal based on the change of the GPS information received as the user terminal moves. As described above, each user terminal that calculates the moving speed information can transmit a reference signal including the calculated moving speed information and the position information to the transmitting and receiving beam forming apparatus 500. Then, the matrix calculator 501 extracts the position information and the moving speed information of the user terminal from the reference signal and can use the matrix information for transmission / reception beamforming.

For example, assuming that the position of the transmitting / receiving beam forming apparatus 500 is (0, 0, 0) according to a two-dimensional Cartesian coordinate system of xyz,

Figure 112016003274726-pat00051
. ≪ / RTI > here,
Figure 112016003274726-pat00052
May represent the difference between the height of the actual transmit beamforming device from the ground and the height between the kth user terminal. At this time, also, the k-th user terminal is maximum at the position of the moving speed in V k, the k th user terminal in the xy plane, as described in the second
Figure 112016003274726-pat00053
The matrix calculator 501 calculates the matrix of the xy plane of the signal that can be received through the reception antenna array of the transmitting and receiving beam forming apparatus 300 from the jth user terminal for T time, The radius of the circle at
Figure 112016003274726-pat00054
. That is, the matrix calculator 501 can calculate an area that can exist as the jth user terminal moves based on the location information and the moving speed information of the jth user terminal.

In step 412, the matrix calculation unit 501 calculates all possible horizontal incidence angles of the signals that can be received from the k-th user terminal based on the calculated radius of the circle

Figure 112016003274726-pat00055
And vertical incidence angle
Figure 112016003274726-pat00056
Can be calculated. For example, the matrix calculation unit 501 calculates the horizontal incidence angle?
Figure 112016003274726-pat00057
And vertical incidence angle
Figure 112016003274726-pat00058
Respectively.

In step 413, the matrix calculator 501 calculates all possible horizontal incidence angles of the signal received from the moving kth user terminal

Figure 112016003274726-pat00059
And vertical incidence angle
Figure 112016003274726-pat00060
Which indicates the degree of phase delay of a signal received by the receiving antenna
Figure 112016003274726-pat00061
Lt; / RTI > Then, the matrix calculation unit 501 calculates
Figure 112016003274726-pat00062
A matrix including a vector space of < RTI ID = 0.0 >
Figure 112016003274726-pat00063
Can be generated. For example,
Figure 112016003274726-pat00064
Can be expressed by Equation (7) below.

Figure 112016003274726-pat00065

According to Equation (7), the matrix

Figure 112016003274726-pat00066
In the row space of
Figure 112016003274726-pat00067
It can be confirmed that the vector space of FIG. That is, all the column vectors corresponding to the phases of the signals input through the respective reception antenna arrays disposed in the transmission /
Figure 112016003274726-pat00068
As shown in FIG. Accordingly, the transmission / reception beamforming apparatus 500 can perform a matrix
Figure 112016003274726-pat00069
A reception beam for controlling interference by another user terminal can be formed.

In step 420, the reception beam forming unit 502 generates a matrix

Figure 112016003274726-pat00070
A plurality of reception beams can be formed. At this time, the reception beam forming unit 502 receives a first reception beam for controlling an interference signal generated between user terminals as a signal is transmitted from a plurality of user terminals, and an average reception SNR (Signal to Average) of a signal transmitted from the user terminal. And a second receive beam controlling a noise ratio.

For example, the reception beam forming unit 502 may form a matrix

Figure 112016003274726-pat00071
(
Figure 112016003274726-pat00072
) Can be determined from the singular values of the low specific values below the predetermined reference singular value. Then, the reception beam forming unit 502 receives the determined low singular values as a singular vector,
Figure 112016003274726-pat00073
Can be formed. For example, the reception beam former 502 may calculate a matrix of at least one other user terminal that simultaneously transmits a signal with a jth user terminal using Equation (8)
Figure 112016003274726-pat00074
(
Figure 112016003274726-pat00075
The first reception beam < RTI ID = 0.0 >
Figure 112016003274726-pat00076
Can be formed.

Figure 112016003274726-pat00077

In Equation (8)

Figure 112016003274726-pat00078
Represents a matrix including a vector space of signals which are caused to interference to a jth user terminal,
Figure 112016003274726-pat00079
(
Figure 112016003274726-pat00080
Left singular vectors corresponding to very small values, such as a singular value of 0 or less than a reference singular value, are transmitted to the first reception beam < RTI ID = 0.0 >
Figure 112016003274726-pat00081
As shown in FIG. Here,
Figure 112016003274726-pat00082
(
Figure 112016003274726-pat00083
) Is the sum of all possible horizontal incidence angles of the signal transmitted by the k-th user terminal
Figure 112016003274726-pat00084
And vertical incidence angle
Figure 112016003274726-pat00085
Lt; RTI ID = 0.0 >
Figure 112016003274726-pat00086
Is larger than the zero space of the vector space of < RTI ID = 0.0 &
Figure 112016003274726-pat00087
(
Figure 112016003274726-pat00088
The zero space of
Figure 112016003274726-pat00089
May include the null space of. Accordingly,
Figure 112016003274726-pat00090
A signal from a plurality of user terminals may be expressed as Equation (9).

Figure 112016003274726-pat00091

According to Equation (9), the first reception beam

Figure 112016003274726-pat00092
When receiving a signal from a plurality of other user terminals transmitting signals simultaneously with the jth user terminal and the jth user terminals through the jth user terminal,
Figure 112016003274726-pat00093
(
Figure 112016003274726-pat00094
The zero space of
Figure 112016003274726-pat00095
Only the signal of the jth user terminal is valid, and the signals of the other user terminals may have a value close to 0 or close to zero. Accordingly, the influence of the interference signal by the other user terminals on the jth user terminal can be reduced or eliminated.

As another example, the reception beam forming unit 502 may form a matrix

Figure 112016003274726-pat00096
(
Figure 112016003274726-pat00097
Eigenvalues corresponding to a predetermined reference eigenvalue greater than or equal to a predetermined reference eigenvalue. Then, the reception beam former 502 generates a second reception beam (eigenvector)
Figure 112016003274726-pat00098
Can be formed. That is, by forming the second reception beam with high eigenvalues corresponding to the reference eigenvalues or more as eigenvectors, the strength of a signal transmitted from the jth user terminal can be maximized compared with other user terminals. In this way, when the second reception beam is used, the average beam gain at the reception antenna for the signal of the jth user terminal can be increased, although the interference signal by other user terminals can not be reduced or eliminated. That is, the second reception beam may mean a beam that increases the average reception SNR of the jth user terminal.

In step 430, the beam determining unit 503 may determine any one of the plurality of reception beams formed as a reception beam for receiving a signal from the user terminal. For example, the beam determining section 503 may determine that the first reception beam

Figure 112016003274726-pat00099
The average beam gain obtainable at the receiving antenna can be calculated. The beam determining unit 503 can calculate the average beam gain P j according to the first reception beam based on Equation (10) below.

Figure 112016003274726-pat00100

In Equation (10)

Figure 112016003274726-pat00101
,
Figure 112016003274726-pat00102
,
Figure 112016003274726-pat00103
,
Figure 112016003274726-pat00104
,
Figure 112016003274726-pat00105
Are the same as the indexes already described in the above Equations (1) to (9), and a duplicate description will be omitted.

The beam determining unit 503 receives the average beam gain Pj according to the calculated first reception beam and the predetermined reference gain < RTI ID = 0.0 >

Figure 112016003274726-pat00106
Can be compared. At this time, when the average beam gain P j is larger than the reference gain
Figure 112016003274726-pat00107
The beam determining section 503 determines that the first reception beam < RTI ID = 0.0 >
Figure 112016003274726-pat00108
As the final receive beam for the j < th > user terminal, and the average beam gain Pj is the reference gain
Figure 112016003274726-pat00109
The beam determining section 503 determines that the second reception beam < RTI ID = 0.0 >
Figure 112016003274726-pat00110
May be determined as the final receive beam for the jth user terminal.

In step 440, the data receiving unit 504 may receive data from the user terminal via the determined final receiving beam. For example, the final received beam < RTI ID = 0.0 >

Figure 112016003274726-pat00111
, The final reception beam
Figure 112016003274726-pat00112
The signal r j received from the transmitting / receiving beam forming apparatus 500 can be expressed by Equation (11) below.

Figure 112016003274726-pat00113

The reception beam is formed such that the interference signal is controlled without channel estimation. However, if channel estimation is possible, the transmission / reception beamforming apparatus 500 may perform channel estimation and decode the reception signal. For example, if channel estimation is possible because the dimension of the received signal r j is smaller than the number of receive antennas, or if the reliability of the estimated channel is high because the movement speed of the jth user terminal is slower than the reference speed, The receiver 500 may decode the received signal using coherent detection. On the other hand, when the speed of the user terminal is faster than the reference speed and the reliability of the estimated channel is low, the transmission / reception beamforming apparatus 500 uses the non-coherent detection to detect multiple streams Can be decoded. 3, the transmission / reception beamforming apparatus 500 for channel estimation and decoding may further include a channel estimation unit (not shown) and a decoding unit (not shown).

In operation 450, the transmission beam forming unit 505 may form a transmission beam of the user terminal based on the location information of the user terminal, the moving speed information, or the property of the reception beam. At this time, the transmission beam forming unit 505 forms an area of a signal that can be received from each of the plurality of user terminals determined based on the position information of the user terminal and the traveling speed information, or the area of the signal that can be received from the final receiving beam determined by the beam determining unit 503 The number of transport streams of the user terminal can be determined. The transmission beam forming unit 505 may feed back the determined number of transport streams to the corresponding user terminal.

For example, the transmission beamformer 505 may be configured such that the areas of each signal that can be received from the respective user terminals determined based on the location information and the moving speed information of each user terminal are superimposed or very close to the predetermined reference value , The influence of the interference increases, so that the number of transport streams can be determined as a single stream. Here, the regions of each signal that can be received from the user terminals may be an area corresponding to the circle or circle in FIG. 2, that is, an area where signals exist due to movement of the user terminal. When the number of transport streams is determined, the transmission beam forming unit 505 can feedback to the user terminal that the transport stream is determined as a single stream. At this time, if the areas of the respective signals that can be received from the respective user terminals do not overlap with each other according to the location information and the moving speed information of each user terminal, or if they are located farther than the preset reference value, the transmission beam forming unit 505 The number of transport streams can be determined as multiple streams. The transmission beam forming unit 505 may feed back to the user terminal that the transport stream is determined to be a multiple stream.

As another example, when the attribute of the reception beam (i.e., the property of the final reception beam) is used, the transmission beam forming unit 505 determines that the beam attribute of the signal received from the user terminal is &

Figure 112016003274726-pat00114
Lt; RTI ID = 0.0 >
Figure 112016003274726-pat00115
The number of transport streams can be determined. For example,
Figure 112016003274726-pat00116
The transmission beam forming unit 505 can determine the number of transport streams as a single stream because the interference is not removed. The first receiving beam
Figure 112016003274726-pat00117
The transmission beam forming unit 505 can determine the number of transport streams as a multiple stream because the interference is removed. Then, the transmission beam forming unit 505 can feed back the determined number of transport streams to the corresponding user terminal. Each user terminal may generate a transmission beam corresponding to the number of transmission streams fed back from the transmission / reception beam forming apparatus 500 and transmit the transmission beam to the transmission / reception beam forming apparatus 500. At this time, due to the mobility of each of the K user terminals, it is impossible to transmit a beam toward a specific direction, so that each transmission beam can have an omni-directional direction.

As described above, the transmitting / receiving beam forming method and apparatus for supporting the mobility of the user terminal determines a region in which the signal transmitted from the user terminal exists in accordance with the movement of the user terminal based on the position information and the moving speed information of the user terminal And calculates a range of a horizontal incidence angle and a vertical incidence angle incident through a receiving antenna array disposed in the transmitting / receiving beam forming apparatus based on the determined area, and based on the calculated range of the vertical incidence angle of the horizontal incidence angle range And forming a reception beam using the calculated matrix, thereby forming a reception beam for controlling interference by other user terminals. Accordingly, it is possible to decode the data received through the reception beam without channel estimation, thereby lowering the complexity of the system implementation.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, controller, arithmetic logic unit (ALU), digital signal processor, microcomputer, field programmable array (FPA) A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing apparatus may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (12)

A method of forming a beam of signals transmitted and received between a base station and a plurality of user terminals for a plurality of user terminals belonging to a base station,
Calculating a matrix based on a horizontal incidence angle and a vertical incidence angle at which the signal transmitted from the user terminal is received through the reception antenna array of the base station, using the position information and the moving speed information of each of the plurality of user terminals step;
Forming a plurality of receive beams based on the calculated matrix;
Determining a receive beam for each of the plurality of user terminals to receive a signal from the user terminal among the plurality of receive beams formed; And
Receiving data from each user terminal through a reception beam corresponding to each of the determined plurality of user terminals
Lt; / RTI >
Wherein forming a plurality of receive beams based on the matrix further comprises:
Forming a first receive beam to control an interference signal occurring between user terminals as a signal is transmitted in the plurality of user terminals; And
Forming a second receive beam to control an average received signal to noise ratio (SNR) of a signal transmitted from a user terminal
/ RTI > delete A method of forming a beam of signals transmitted and received between a base station and a plurality of user terminals for a plurality of user terminals belonging to a base station,
Calculating a matrix based on a horizontal incidence angle and a vertical incidence angle at which the signal transmitted from the user terminal is received through the reception antenna array of the base station, using the position information and the moving speed information of each of the plurality of user terminals step;
Forming a plurality of receive beams based on the calculated matrix;
Determining a receive beam for each of the plurality of user terminals to receive a signal from the user terminal among the plurality of receive beams formed; And
Receiving data from each user terminal through a reception beam corresponding to each of the determined plurality of user terminals
Lt; / RTI >
Wherein the step of calculating the matrix further comprises:
Calculating a radius of a circle corresponding to a region in which the user terminal exists for a period of time during which the base station and the user terminal communicate with each other based on the position information and the movement speed information;
Calculating a range of a horizontal incidence angle and a range of a normal incidence angle at which a signal transmitted from a user terminal is incident through a reception antenna array of the base station based on the calculated radius of the circle; And
Calculating the matrix based on the range of the horizontal incidence angle and the range of the normal incidence angle
/ RTI > The method of claim 3,
The radius of the circle,
Adjusted according to the moving speed information of the user terminal
Wherein the first and second beams are transmitted through the first and second beams. A method of forming a beam of signals transmitted and received between a base station and a plurality of user terminals for a plurality of user terminals belonging to a base station,
Calculating a matrix based on a horizontal incidence angle and a vertical incidence angle at which the signal transmitted from the user terminal is received through the reception antenna array of the base station, using the position information and the moving speed information of each of the plurality of user terminals step;
Forming a plurality of receive beams based on the calculated matrix;
Determining a receive beam for each of the plurality of user terminals to receive a signal from the user terminal among the plurality of receive beams formed;
Receiving data from each user terminal through a reception beam corresponding to each of the determined plurality of user terminals;
Determining a number of streams to be transmitted in each of the plurality of user terminals based on the position information and the movement speed information; And
Forming a transmission beam of each user terminal based on the determined number of streams;
/ RTI > 6. The method of claim 5,
Wherein determining the number of streams to be transmitted comprises:
Determining the number of streams to be transmitted on the basis of whether or not there is a superimposition between areas in which a plurality of user terminals are present or an attribute of a reception beam during a period of communication with the base station determined based on the position information and the movement speed information
Wherein the first and second beams are transmitted through the first and second beams. A transmission and reception beam forming apparatus for forming a beam of a signal to be transmitted and received with a plurality of user terminals,
A matrix calculation for calculating a matrix based on a horizontal incidence angle and a vertical incidence angle at which a signal transmitted from a user terminal is received through a receiving antenna array using position information and moving speed information of each of the plurality of user terminals part;
A reception beamformer for forming a plurality of reception beams based on the calculated matrix;
A beam determining unit for determining, for each of the plurality of user terminals, a reception beam for receiving a signal from the user terminal among the plurality of reception beams formed; And
A data receiving unit for receiving data from each user terminal through a reception beam corresponding to each of the determined plurality of user terminals,
Lt; / RTI >
Wherein the reception beam forming unit comprises:
A first reception beam for controlling an interference signal generated between user terminals as a signal is transmitted from the plurality of user terminals is formed and an average received signal to noise ratio (SNR) of a signal transmitted from the user terminal is controlled Forming a second receive beam
Receiving beam forming apparatus. delete A transmission and reception beam forming apparatus for forming a beam of a signal to be transmitted and received with a plurality of user terminals,
A matrix calculation for calculating a matrix based on a horizontal incidence angle and a vertical incidence angle at which a signal transmitted from a user terminal is received through a receiving antenna array using position information and moving speed information of each of the plurality of user terminals part;
A reception beamformer for forming a plurality of reception beams based on the calculated matrix;
A beam determining unit for determining, for each of the plurality of user terminals, a reception beam for receiving a signal from the user terminal among the plurality of reception beams formed; And
A data receiving unit for receiving data from each user terminal through a reception beam corresponding to each of the determined plurality of user terminals,
Lt; / RTI >
Wherein the matrix calculator comprises:
Calculates a radius of a circle corresponding to a region where the user terminal exists for a period of time during which the base station communicates with the user terminal based on the position information and the movement speed information, Calculating a range of horizontal incidence angles and a range of vertical incidence angles incident through the receiving antenna array of the receiving antenna array and calculating the matrix based on the range of the horizontal incidence angle and the range of the normal incidence angle
Receiving beam forming apparatus. 10. The method of claim 9,
The radius of the circle,
Adjusted according to the moving speed information of the user terminal
Receiving beam forming apparatus. A transmission and reception beam forming apparatus for forming a beam of a signal to be transmitted and received with a plurality of user terminals,
A matrix calculation for calculating a matrix based on a horizontal incidence angle and a vertical incidence angle at which a signal transmitted from a user terminal is received through a receiving antenna array using position information and moving speed information of each of the plurality of user terminals part;
A reception beamformer for forming a plurality of reception beams based on the calculated matrix;
A beam determining unit for determining, for each of the plurality of user terminals, a reception beam for receiving a signal from the user terminal among the plurality of reception beams formed;
A data receiving unit for receiving data from each user terminal through a reception beam corresponding to each of the determined plurality of user terminals; And
A transmission beam forming section for determining the number of streams to be transmitted in each of the plurality of user terminals based on the position information and the movement speed information, and forming a transmission beam of each user terminal based on the determined number of streams,
Wherein the transmission and reception beam forming apparatus includes: 12. The method of claim 11,
Wherein the transmission beam forming unit comprises:
Determining the number of streams to be transmitted on the basis of whether or not there is overlap between areas in which each of a plurality of user terminals exist or a property of a reception beam during a time of communicating with a base station determined based on the positional information and moving speed information
Receiving beam forming apparatus.
KR1020160003685A 2016-01-12 2016-01-12 Method and apparatus for forming transceiving beam to supprot mobility of the transmitter KR101742421B1 (en)

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Publication number Priority date Publication date Assignee Title
US11265072B2 (en) 2019-07-30 2022-03-01 Iucf-Hyu (Industry-University Cooperation Foundation Hanyang University) Apparatus and method for beam alignment based on location information in wireless communication system

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Publication number Priority date Publication date Assignee Title
KR101045480B1 (en) 2002-02-26 2011-06-30 노오텔 네트웍스 리미티드 Improved diversity radio communications device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101045480B1 (en) 2002-02-26 2011-06-30 노오텔 네트웍스 리미티드 Improved diversity radio communications device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11265072B2 (en) 2019-07-30 2022-03-01 Iucf-Hyu (Industry-University Cooperation Foundation Hanyang University) Apparatus and method for beam alignment based on location information in wireless communication system

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