KR101987002B1 - Methods and apparatus for wireless communication using adaptive control of transmit polarization - Google Patents

Methods and apparatus for wireless communication using adaptive control of transmit polarization Download PDF

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KR101987002B1
KR101987002B1 KR1020120057866A KR20120057866A KR101987002B1 KR 101987002 B1 KR101987002 B1 KR 101987002B1 KR 1020120057866 A KR1020120057866 A KR 1020120057866A KR 20120057866 A KR20120057866 A KR 20120057866A KR 101987002 B1 KR101987002 B1 KR 101987002B1
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polarization
transmission
index
polarization state
channel
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KR1020120057866A
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Korean (ko)
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KR20130007420A (en
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엄순영
전순익
정영준
최재익
문철
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한국전자통신연구원
한국교통대학교산학협력단
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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
    • H04B7/10—Polarisation diversity; Directional diversity

Abstract

A wireless communication method and apparatus using adaptive transmission polarization control is disclosed. The wireless communication apparatus includes an orthogonal polarization antenna for receiving at least one reference signal, a channel state estimator for estimating a radio polarization channel based on the reference signal, and an estimated radio polarization channel among a plurality of predefined transmission polarization states. And a transmission polarization state selection unit for feeding back the selected transmission polarization state information after selecting the transmission polarization state. Accordingly, information for polarization control may be fed back using a minimum uplink radio resource, and transmission capacity may be maximized based on the fed back information.

Figure R1020120057866

Description

Method and apparatus for wireless communication using adaptive transmission polarization control TECHNICAL TECHNICAL TECHNICAL FIELD OF APPARATUS FOR WIRELESS COMMUNICATION USING ADAPTIVE CONTROL OF TRANSMIT POLARIZATION

The present invention relates to a wireless communication system, and more particularly, to a wireless communication method and apparatus using adaptive transmission polarization control capable of maximizing the use of radio resources.

Radio resources used in general mobile communication systems include frequency, space, time, polarization, and the like. Orthogonal Frequency Division Multiple Access (OFDMA), Multiple-Input Multiple-Output (MIMO), Scheduling for efficient use of radio resources such as frequency, space, and time in mobile communication systems Based Time Division Multiple Access (TDMA) technology is used.

However, in order to satisfy the exponentially increasing demand for wireless data, there is a need to develop and efficiently utilize additional radio resources other than the existing frequency, space, and time resources.

Therefore, there is a growing interest in technology development for increasing transmission capacity by more actively utilizing a limited polarization resource such as polarization diversity in a conventional mobile communication system.

In a wireless channel, a polarization spread (PS) phenomenon occurs in which a signal transmitted from a transmitter in a predetermined polarization mode is transformed into various polarization modes by multipath fading and reaches a receiver.

In addition, when the polarization of the transmitted signal reaching the receiver does not match the polarization mode of the receiver antenna, polarization mismatch loss (PML) occurs.

In a conventional mobile communication system, polarization diversity is used to obtain diversity gain in a wireless channel environment in which polarization dispersion is very high, but performance degradation due to polarization mismatch loss occurs in a channel environment in which polarization dispersion is not severe. Accordingly, there is a need for a method of improving transmission capacity while minimizing performance degradation due to polarization dispersion and polarization mismatch loss occurring in a wireless channel.

In order to suppress distortion such as polarization dispersion and polarization mismatch loss occurring in a wireless channel, a precoding technique for transmitting and distorting a transmission signal in advance in a transmitting apparatus is required to minimize channel distortion to occur. For predistortion of the transmission signal, the transmitter and the receiver must know the polarization channel state information (PCSI) between the transmitter and the receiver.

In particular, in downlink, a transmitting apparatus must know downlink polarization channel state information (PCSI) from a transmitting antenna of a transmitting apparatus (for example, a base station) to a receiving antenna of a terminal.

Meanwhile, in a wireless communication system using frequency division duplex, since downlink and uplink use different frequency bands, a transmitting device may determine a downlink polarization channel state information (PCSI) at a receiving device. The downlink polarization channel state should be estimated, and the estimated downlink polarization channel state information should be fed back to the transmitter.

In order for the receiving device to feed back the polarized channel state information to the transmitting device, a lot of uplink resources are required. Therefore, an effective feedback method for transmitting the polarized channel state information to the transmitting device using minimum feedback information is required.

However, considering the development direction of the mobile communication system, the number of transmit antennas will inevitably increase for the MIMO technology, and thus, the polarization channel state information that the receiver should feed back to the transmitter is expected to increase rapidly.

Therefore, a feedback technique for delivering polarized channel state information to a transmitting device using only a limited amount of feedback information is required.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to feed back information for polarization control using a minimum of uplink radio resources, and adaptive transmission capable of maximizing a transmission capacity based on the fed back information. It is to provide a wireless communication device using polarization control.

In addition, another object of the present invention is to provide feedback for polarization control using a minimum uplink radio resource, and wireless communication using adaptive transmission polarization control capable of maximizing transmission capacity based on the feedback information. To provide a way.

In order to achieve the above object of the present invention, a wireless communication apparatus using adaptive transmission polarization control according to an aspect of the present invention includes an orthogonal polarization antenna for receiving at least one reference signal, and a wireless polarization based on the reference signal. A channel state estimator for estimating a channel and a transmission polarization state selector for selecting a transmission polarization state corresponding to the estimated wireless polarization channel from among a plurality of predefined transmission polarization states and feeding back selected transmission polarization state information.

The transmission polarization state selection unit may select a transmission polarization state that maximizes a data rate among the plurality of transmission polarization states, and feed back an indicator of the selected transmission polarization state.

The wireless communication apparatus may further include a channel state information estimator configured to calculate a signal to interference noise ratio or data rate that can be received using the selected transmission polarization state, and to feed back the calculated signal to interference noise ratio or data rate as channel state information. Can be.

Here, the plurality of predefined transmission polarization states are composed of a plurality of polarization state matrices, and the transmission polarization state selection unit selects one polarization state matrix among the plurality of transmission polarization state matrices, and selects one selected polarization state matrix. One of two orthogonal polarization vectors may be selected.

Here, the transmission polarization state selection unit may feed back a preferred matrix index indicating a selected polarization state matrix and a preferred polarization index indicating a selected polarization vector.

In addition, a wireless communication apparatus using adaptive transmission polarization control according to another aspect of the present invention for achieving the object of the present invention, at least one orthogonal polarization antenna for receiving each of at least one reference signal, and the reference signal After selecting a space-polarization weight corresponding to the estimated space-polarization channel from a channel state estimator and a predefined space-polarization weight vector codebook based on the estimated space-polarization channel, feedback the selected space-polarization weight information. And a space-polarization weight selection unit.

Here, the predefined space-polarization weight vector codebook may be formed by combining a polarization state matrix set and a precoder codebook for spatial division multiple access.

The space-polarization weight selection unit may feed back an index corresponding to the polarization weight vector selected from the space-polarization weight vector codebook and an index corresponding to the selected spatial weight vector.

In addition, the wireless communication apparatus using the adaptive transmission polarization control according to another aspect of the present invention for achieving the object of the present invention, at least one of the transmission polarization state information and channel quality information received from at least one receiving apparatus. A scheduler that selects at least one receiving apparatus based on the at least one receiving apparatus, and determines a modulation and coding scheme of a signal to be transmitted to each of the selected at least one receiving apparatus, and based on a modulation and coding scheme determined at each of the selected at least one receiving apparatus. A code and a modulator configured to perform a modulation to respectively transmit a transmission layer to the at least one receiving device, and to the at least one receiving device selected based on the transmission polarization state information received from the at least one receiving device. Transmission polarization state control to control polarization of transmission layer to be transmitted And each unit being composed of two orthogonal linearly polarized antenna element, it comprises at least one antenna of at least orthogonal polarization polarized radiation is controlled to a transport layer through each of the orthogonal linear polarization antenna elements.

Here, the scheduler selects two terminals having a maximum transmission rate of data to be transmitted simultaneously based on at least one of transmission polarization state information and channel quality information respectively received from a plurality of receiving apparatuses, and simultaneously selects two terminals. Each of the data to be transmitted may be transmitted to two orthogonal linearly polarized antenna elements constituting one orthogonal polarized antenna.

Here, the scheduler selects a terminal having a maximum transmission rate of data to be transmitted simultaneously based on at least one of transmission polarization state information and channel quality information respectively received from a plurality of receiving apparatuses by twice the number of orthogonal polarization antennas. Can be.

In addition, the wireless communication method using the adaptive transmission polarization control according to an aspect of the present invention for achieving another object of the present invention, the step of estimating the radio polarization channel based on the received reference signal, the estimated radio polarization Selecting a transmission polarization state from among a plurality of predefined transmission polarization states based on the channel, and transmitting indication information indicating the selected transmission polarization state.

Here, the plurality of predefined transmission polarization states are composed of a plurality of polarization state matrices, and the indication information indicating the transmission polarization state is an index indicating a selected polarization state matrix among the plurality of polarization state matrices. ) And index information indicating the selected polarization vector.

In addition, the wireless communication method using the adaptive transmission polarization control according to another aspect of the present invention for achieving the object of the present invention comprises the steps of: estimating the space-polarization channel based on at least one received reference signal; Selecting a space-polarization weight corresponding to the estimated space-polarization channel from a defined space-polarization weight vector codebook and transmitting the selected space-polarization weight information.

In addition, the wireless communication method using the adaptive transmission polarization control according to another aspect of the present invention for achieving the object of the present invention, at least one of the transmission polarization state information and channel quality information received from at least one receiving apparatus. Selecting at least one receiving apparatus based on the at least one receiving apparatus, determining a modulation and coding scheme of a signal to be transmitted to each of the at least one receiving apparatus, and determining a modulation and coding scheme determined at each of the selected at least one receiving apparatus. Constructing a transmission layer to be respectively transmitted to the at least one receiving apparatus by performing encoding and modulation on the basis of the at least one receiving apparatus, and transmitting the selected at least one receiving apparatus based on the transmission polarization state information received from the at least one receiving apparatus. Controlling polarization of the transport layer to be transmitted and polarization respectively A controlled transmission, each layer comprises the step of transmitting using the orthogonal linear polarization.

According to the wireless communication method and apparatus using the adaptive transmission polarization control as described above, the transmitting apparatus and all receiving apparatuses in advance promise a TPS set consisting of a plurality of transmittable polarization states, the terminal is optimal in the TPS set Select the TPS, and feeds back the index corresponding to the selected TPS to the base station.

In addition, two orthogonal transmit polarization states and two mobile stations to receive data in which the sum of the rates of two data streams transmitted simultaneously through the two orthogonal polarizations are maximized are determined and orthogonal to the determined two mobile stations. Simultaneous data transmission using two transmission polarizations.

In addition, in a wireless communication system using a transmission and reception array antenna composed of a plurality of orthogonal polarization antenna elements each transmitting two orthogonal polarizations, a data stream simultaneously transmitted through a transmission channel formed two-dimensionally in a spatial and polarization domain is used. In order to maximize the sum of the rates, the optimal transmission polarization state, the weight of the spatial array antenna, and the terminals to receive the data at the same time are determined to perform the spatial-polarization division multiple access.

Therefore, by adaptively controlling the polarization of the signal transmitted from the transmitting apparatus by using the limited amount of uplink feedback information, it is possible to minimize performance degradation due to polarization dispersion occurring in the wireless channel and polarization mismatch between the transmission and reception polarization, and downlink The transmission capacity can be maximized.

In addition, the wireless communication method and apparatus using the transmission polarization control in accordance with the present invention enables the operation and utilization of the optimal radio wave resources to adapt to various future mobile communication network architectures and various wireless environments, and the next generation high-speed data transmission Many economic effects can be obtained by broadly applying to the base station and / or repeater system of the new next-generation mobile communication system in which the polarization division multiple access and the space division multiple access technologies are converged for the next generation.

1 is a block diagram showing the configuration of a wireless communication device according to an embodiment of the present invention.
2 is a conceptual diagram illustrating weight determination for transmission polarization control in a wireless communication device according to an embodiment of the present invention.
3 is a flowchart illustrating a wireless communication method using adaptive transmission polarization control according to an embodiment of the present invention.
4 is a block diagram illustrating a configuration of a wireless communication device according to another embodiment of the present invention.
5 is a flowchart illustrating a wireless communication method using adaptive transmission polarization control according to another embodiment of the present invention.
6 is an exemplary diagram illustrating an array antenna configuration of a base station performing space-polarization division multiple access according to another embodiment of the present invention.
7 is a block diagram showing the configuration of a wireless communication device according to another embodiment of the present invention.
8 is a flowchart illustrating a space-polarization division multiple access method using adaptive polarization control according to another embodiment of the present invention.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description.

However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

The terminal used in the present application is a user equipment (UE), a mobile station (MS), a relay node (RN), a machine type communication (MTC) device, or a mobile terminal (MT). ), A user terminal, a user terminal (UT), a wireless terminal, an access terminal (AT), a subscriber unit, a subscriber station (SS), a wireless device, a wireless communication device, Wireless Transmit / Receive Unit (WTRU), mobile node, mobile or other terms.

In addition, the "base station" used in the present application is a base station (Node-B), e-node-B (eNode-B), BTS (Base Transceiver System), access point (Access Point) , May be called other terms such as transmission point.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. Hereinafter, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

In a wireless communication method using adaptive transmission polarization control according to an embodiment of the present invention, in a wireless communication system using polarization of a transmission signal, feedback information is received using a limited amount of uplink feedback information and based on the received feedback information. A polarization matching method for optimally matching polarization of a transmission signal to a downlink channel state is provided.

In addition, in a wireless communication method using adaptive transmission polarization control according to another embodiment of the present invention, downlink transmission of a wireless communication system is performed by simultaneously transmitting data to two terminals using polarizations orthogonal to each other based on a polarization matching method. A polarization division multiple access (PDMA) method for increasing capacity is provided.

In addition, in a wireless communication method using adaptive transmission polarization control according to another embodiment of the present invention, a polarization division multiple access method and a spatial division multiplexing in a wireless communication system including a transmitting device and a receiving device having an orthogonal polarization array antenna Provided are a space-polarization division multiple access method that optimally combines access methods.

Hereinafter, a polarization matching method using a limited amount of feedback information in a wireless communication method using adaptive transmission polarization control according to an embodiment of the present invention will be described.

1 is a block diagram illustrating a configuration of a wireless communication apparatus according to an embodiment of the present invention, and illustrates an example of a terminal and a base station performing adaptive transmission polarization control using a limited amount of uplink feedback information.

2 is a conceptual diagram illustrating weight determination for transmission polarization control in a wireless communication device according to an embodiment of the present invention.

1 and 2, first, the terminal 100 may include a quadrature polarization antenna 110, a channel state estimator 130, a transmission polarization state selector 150, and a CQI estimator 170. .

Hereinafter, for convenience of description, it is assumed that the terminal 100 illustrated in FIG. 1 is a k-th terminal 100 among a plurality of terminals belonging to a cell operated by the base station 200.

The orthogonal polarization antenna 110 may be composed of two orthogonal linearly polarized antenna elements 111 and 113, and receives two orthogonal linearly polarized signals transmitted from the base station 200 and provides them to the channel state estimator 130. do. Here, two orthogonal linearly polarized signals transmitted from the base station 200 may be received through the received quadrature polarization antenna 110 of the terminal 100 after undergoing multipath fading of the wireless channel.

The terminal 100 may use one linearly polarized antenna element or two orthogonal linearly polarized antenna elements of the orthogonal polarization antenna 110 for signal reception. When the terminal 100 receives signals using two orthogonal linearly polarized antenna elements 111 and 113, a wireless channel between the k-th terminal 100 and the base station 200 may be expressed by Equation 1 below. .

Figure 112012043511012-pat00001

In Equation 1,

Figure 112012043511012-pat00002
Is a downlink radio signal experienced by a signal transmitted through the y-direction orthogonal linearly polarized antenna element 273 of the base station 200 through the x-direction orthogonal linearly polarized antenna element 113 of the k-th terminal 100. Means a channel. Also,
Figure 112012043511012-pat00003
Direction and
Figure 112012043511012-pat00004
Direction transmission polarizations are orthogonal to each other, and the kth terminal 100
Figure 112012043511012-pat00005
Direction and
Figure 112012043511012-pat00006
Directional reception polarizations are orthogonal to each other.

Channel matrix shown in equation (1)

Figure 112012043511012-pat00007
Includes a polarization spread phenomenon occurring on a wireless channel and a mismatch between a transmission polarization and a reception polarization. In order to solve the mismatch between polarization dispersion and transmission / reception polarization occurring in the downlink radio channel, the downlink polarization channel state between the base station 200 and each terminal 100 should be known.

The channel state estimator 130 estimates a downlink polarization channel matrix as shown in Equation 1 based on the signal provided from the quadrature polarization antenna 110. To this end, the base station 200 transmits different reference signals to the terminal 100 through two orthogonal linearly polarized antenna elements 271 and 273, and the two orthogonal linearly polarized antenna elements 111, After each of the two reference signals is received using 113), a downlink polarization channel matrix as shown in Equation 1 is estimated.

The transmission polarization state selection unit 150 of the k th terminal 100 estimates the downlink polarization channel matrix estimated by the channel state estimation unit 130.

Figure 112012043511012-pat00008
Transmit polarization state (hereinafter, abbreviated as 'TPS') set using
Figure 112012043511012-pat00009
Determine the optimal TPS at. The terminal 100 transmits the determined optimal TPS information to the base station 200 through an uplink feedback channel.

Here, since the amount of uplink feedback information that can be transmitted by each terminal 100 is limited, the terminal 100 should feed back the optimal TPS information to the base station 200 using the limited amount of feedback information.

In an embodiment of the present invention, the base station 200 and all the terminals 100 in the cell promise in advance a TPS set composed of a plurality of transmittable TPSs, and the terminal 100 may maximize downlink transmission capacity. The optimal TPS is selected from a predetermined TPS set, and the index of the selected optimal TPS within the TPS set is transmitted to the base station 200.

One TPS may be expressed as a vector p having a size of 2 × 1 as shown in Equation 2.

Figure 112012043511012-pat00010

In Equation 2,

Figure 112012043511012-pat00011
Wow
Figure 112012043511012-pat00012
Are orthogonal to each other radiated from the orthogonal polarization antenna 270 of the base station 200, respectively.
Figure 112012043511012-pat00013
Polarization signal in the direction
Figure 112012043511012-pat00014
Complex weights that determine the magnitude and phase of the polarized signal in the direction,
Figure 112012043511012-pat00015
Is,
Figure 112012043511012-pat00016
Wow
Figure 112012043511012-pat00017
Are each
Figure 112012043511012-pat00018
Wow
Figure 112012043511012-pat00019
Is determined.

Hereinafter, a weight determination method for transmission polarization control according to an embodiment of the present invention will be described in detail with reference to FIG. 2.

In Figure 2

Figure 112012043511012-pat00020
Is
Figure 112012043511012-pat00021
Indicates the movement of the angle to be rotated with the polarization direction as the starting point,
Figure 112012043511012-pat00022
Back side
Figure 112012043511012-pat00023
Direction polarization,
Figure 112012043511012-pat00024
Back side
Figure 112012043511012-pat00025
Indicates polarization in the direction. or,
Figure 112012043511012-pat00026
If,
Figure 112012043511012-pat00027
It shows the same polarization as the direction.

Therefore, in order to represent M transmittable TPSs having a uniform interval, M as shown in equation (3)

Figure 112012043511012-pat00028
Can be determined.

Figure 112012043511012-pat00029

TPS set including M transmittable TPSs promised by the base station 200 and the terminal 100 in advance

Figure 112012043511012-pat00030
Is M vectors as in Equation 4 using Equations 2 and 3
Figure 112012043511012-pat00031
Can be represented as a set of

Figure 112012043511012-pat00032

Also, M

Figure 112012043511012-pat00033
Set of TPSs
Figure 112012043511012-pat00034
May be expressed as a set of quantized transmission polarization directions as in Equation 5.

Figure 112012043511012-pat00035

Referring back to FIG. 1, the transmission polarization state selection unit 150 of the k-th terminal 100 may determine an optimal TPS index.

Figure 112012043511012-pat00036
TPS set
Figure 112012043511012-pat00037
Determine optimally within the given selection criteria. For example, when the terminal 100 selects the TPS maximizing the downlink transmission power, the optimal TPS index of the k-th terminal 100 as shown in Equation 6
Figure 112012043511012-pat00038
Can be determined.

Figure 112012043511012-pat00039

Optimum TPS determined as in Equation 6

Figure 112012043511012-pat00040
Is the polarization channel matrix as
Figure 112012043511012-pat00041
Singular vector of
Figure 112012043511012-pat00042
Set of TPS closest vectors with distance
Figure 112012043511012-pat00043
Same as choosing from.

Figure 112012043511012-pat00044

The transmission polarization state selection unit 150 of the k th terminal 100 selects an index of the selected optimal TPS.

Figure 112012043511012-pat00045
Feeds back to the base station 200.

In addition, the CQI estimator 170 of the k-th terminal 100 calculates a signal to interference and noise ratio (SINR) that can be received using the selected optimal TPS, and calculates a channel to the calculated signal to interference noise ratio. Channel quality information (hereinafter, abbreviated as 'CQI') is transmitted to the base station 200 through an uplink feedback channel.

The base station 200 may include a scheduler 210, a code and modulator 230, a transmission polarization state control unit 250, and a quadrature polarization antenna 270.

The scheduler 210 maximizes scheduling priority by using the optimal TPS index information and the CQI information fed back from each terminal 100 (for example, the k-th terminal).

Figure 112012043511012-pat00046
After selecting, the modulation and coding scheme (hereinafter, abbreviated as 'MCS') of a layer to be transmitted to the k-th terminal 100 is determined.

The code and modulator 230 generates a symbol by encoding and modulating the data of the scheduled terminal 100 according to the MCS determined by the scheduler 210, and transmits a transmission layer including the generated symbols to a transmission polarization state controller ( 250).

The transmission polarization state controller 250 is provided to the two orthogonal linearly polarized antenna elements 271 and 273 so that the transmission layer provided from the code and modulator 230 can be transmitted to the k-th terminal 100 with an optimal TPS. By controlling the amplitude and phase of the signal, two orthogonal linearly polarized signals having a desired polarization direction are formed. This transmission polarization control process may be performed through signal processing of the baseband, the optimal TPS of the k-th terminal 100 to the symbol x of the transport layer

Figure 112012043511012-pat00047
The multiplication process can be expressed as Equation 8.

Figure 112012043511012-pat00048

In the orthogonal polarization antenna 270 of the base station 200, the first element of the s vector

Figure 112012043511012-pat00049
Transmitted through the directional polarization antenna element, the second element of the vector s
Figure 112012043511012-pat00050
Transmitted through the directional polarization antenna element.

Orthogonal polarization antenna 270 is composed of two orthogonal linearly polarized antenna elements (271, 273), each linearly polarized antenna element (271, 273) is independently provided an input signal, depending on the radiation structure of the antenna Generate orthogonal linear polarizations.

3 is a flowchart illustrating a wireless communication method using adaptive transmission polarization control according to an embodiment of the present invention.

Referring to FIG. 3, first, all terminals in a base station and a cell have a TPS set composed of a plurality of transmittable TPSs.

Figure 112012043511012-pat00051
Promise in advance (S301).

The base station transmits different reference signals RS to all terminals in the cell through two orthogonal linearly polarized antenna elements for downlink polarization channel estimation of the terminal (S303).

The terminal receives a reference signal transmitted through different orthogonal linearly polarized antenna elements from the base station, and estimates a downlink polarized channel as shown in Equation 1 based on the received reference signal (S305).

Thereafter, the UE sets the TPS based on the estimated downlink polarization channel.

Figure 112012043511012-pat00052
In operation S307, an optimal TPS is determined.

In addition, the UE calculates a receivable signal-to-interference noise ratio (SINR) using the selected optimal TPS and obtains CQI information based on the calculated signal-to-interference noise ratio (S309).

Thereafter, the terminal transmits the optimal TPS index information and the CQI information corresponding to the selected optimal TPS to the base station through the uplink feedback channel (S311).

The base station selects one terminal (e.g., k-th terminal) that maximizes the scheduling priority using the optimal TPS index information and CQI information fed back from each terminal (S313), and then MCS of the layer to be transmitted to the k-th terminal. Determine (S315).

Thereafter, the base station generates a symbol by performing encoding and modulation according to the determined MCS and configures a transport layer composed of the generated symbols (S317).

In addition, the base station precodes the signals provided to the two orthogonal linearly polarized antenna elements so that the configured transport layer can be transmitted to the k-th terminal with an optimal TPS, thereby providing two orthogonal linearly polarized signals having a desired polarization direction. To be formed (S319).

Thereafter, the base station transmits the two orthogonal linearly polarized signals to the k-th terminal through the orthogonal polarization antenna (S321).

Hereinafter, with reference to FIGS. 4 and 5, in a wireless communication method using adaptive transmission polarization control according to another embodiment of the present invention, polarization split multiple access for simultaneously transmitting data to two terminals using orthogonal polarizations. The (PDMA) method will be described.

4 is a block diagram illustrating a configuration of a wireless communication device for performing polarization split multiple access using adaptive polarization control according to another embodiment of the present invention.

Referring to FIG. 4, the base station 500 simultaneously transmits downlink data to two terminals 400-1 and 400-2 through two variable orthogonal linear polarizations transmitted simultaneously. Here, the base station 500 can optimally match the downlink channel to the two terminals (400-1, 400-2) receiving the data through the polarization of the TPS of each transmission polarization transmitted at the same time, two polarizations In order to maximize the sum of the transmission rates of the two terminals 400-1 and 400-2 receiving the signal, the two terminals 400-1 and 400-2 to receive the data are selected from the plurality of terminals in the cell. In operation, the optimal TPSs of the selected two terminals 400-1 and 400-2 are simultaneously determined.

Each terminal belonging to a cell operated by the base station 500 may include a quadrature polarization antenna 410, a channel state estimation unit 430, a transmission polarization state selection unit 450, and a CQI estimation unit 470.

Orthogonal polarization antenna 410 of each terminal may be composed of two orthogonal linearly polarized antenna elements (411, 413), respectively transmitted through two orthogonal linearly polarized antenna elements (571, 573) of the base station 500 The reference signal RS is received and provided to the channel state estimator 430. Here, two orthogonal linearly polarized signals transmitted from the base station 500 may be received through the received quadrature polarization antenna 410 of the terminal after undergoing multipath fading of the radio channel.

Each terminal may use one linear polarization antenna element or two orthogonal linear polarization antenna elements of the orthogonal polarization antenna 410 for signal reception. When the terminal receives signals using two orthogonal linearly polarized antenna elements, a wireless channel between the k-th terminal 400-1 or 400-2 and the base station 500 may be expressed as Equation 1.

The channel state estimator 430 of each terminal estimates the downlink polarization channel matrix based on the reference signal RS provided from the orthogonal polarization antenna 410, and selects the transmission polarization state based on the estimated downlink polarization channel matrix information. It is provided to the unit 450.

The transmission polarization state selection unit 450 of each terminal determines an optimal TPS that can be optimally matched to the downlink channel of each terminal based on the downlink polarization channel matrix of each terminal provided from the channel state estimation unit 430. .

In the PDMA according to another embodiment of the present invention, the base station 500 simultaneously transmits data to two terminals 400-1 and 400-2 through two orthogonal polarizations that can be simultaneously transmitted. Two orthogonal polarizations transmitted simultaneously by the base station 500 are 2 × 2 matrix.

Figure 112012043511012-pat00053
Can be expressed as here,
Figure 112012043511012-pat00054
Is a 2 × 1 sized vector representing one TPS and
Figure 112012043511012-pat00055
Has the same meaning as Also,
Figure 112012043511012-pat00056
Is
Figure 112012043511012-pat00057
It is a 2 × 1 sized vector representing one TPS orthogonal to and can be expressed as in Equation (9).

Figure 112012043511012-pat00058

In Equation 9,

Figure 112012043511012-pat00059
to be. Therefore, the base station and the terminals are M number as shown in Equation 3
Figure 112012043511012-pat00060
, And thus M polarization state matrices
Figure 112012043511012-pat00061
Of polarization matrices consisting of
Figure 112012043511012-pat00062
Promise in advance.

Set of polarization matrices

Figure 112012043511012-pat00063
Can be expressed as in Equation 10.

Figure 112012043511012-pat00064

Also, M

Figure 112012043511012-pat00065
And the polarization direction orthogonal to this
Figure 112012043511012-pat00066
Polarization matrix set
Figure 112012043511012-pat00067
May be expressed as in Equation 11.

Figure 112012043511012-pat00068

Referring back to FIG. 4, the transmission polarization state selection unit 450 of each terminal sets a TPS vector that optimally matches the downlink channel of each terminal.

Figure 112012043511012-pat00069
From 2M TPS vectors included in can be selected as shown in Equation 12. Equation 12 shows that each terminal selects a TPS capable of maximizing downlink transmission power or data rate.

Figure 112012043511012-pat00070

In equation (12)

Figure 112012043511012-pat00071
Means an index (preferred matrix index, hereinafter abbreviated as 'PMI') of the matrix to which the TPS vector selected by the k th terminal belongs
Figure 112012043511012-pat00072
Denotes a polarization index (hereinafter, abbreviated as 'PPI') of the vector selected by the k-th terminal, and each terminal feeds back the PMI and the PPI to the base station 500.

In addition, each terminal calculates a signal-to-interference and noise ratio that can be received using the selected optimal TPS vector and transmits it to the base station 500 through the feedback channel as CQI information.

The base station 500 may include a scheduler 510, two code and modulators 530, two transmission polarization state control units 550, and a quadrature polarization antenna 570.

The scheduler 510 satisfies a given scheduling criterion using the PMI and PPI information and the CQI information of the optimal TPS vector fed back from each terminal, and at the same time, the two terminals 400-1 and 400 having the maximum sum of the data rates to be transmitted. -2)

Figure 112012043511012-pat00073
And
Figure 112012043511012-pat00074
Select. In addition, the scheduler 510 determines the MCS of the data stream to be transmitted to the selected two terminals 400-1 and 400-2, respectively. Here, two scheduled UEs 400-1 and 400-2 use TPS vectors that are orthogonal to each other. That is, the terminals 400-1 and 400-2 transmitting data simultaneously are one
Figure 112012043511012-pat00075
Use two vectors that make up each.

Each code and modulator 530 generates a symbol by performing encoding and modulation according to the MCS determined by the scheduler 510, and provides a transport layer composed of the generated symbols.

Each transmission polarization state control unit 550 controls the amplitude and phase of the signal provided to the orthogonal linearly polarized antenna elements 571 and 573 so that the transmission layer provided from each code and modulation unit 530 is transmitted to the optimum TPS of the corresponding terminal. do. This transmission polarization control process may be performed through baseband signal processing, and a 2 × 1 sized vector composed of symbols of two transport layers

Figure 112012043511012-pat00076
Optimal TPS matrix
Figure 112012043511012-pat00077
The multiplication process can be expressed as Equation 13.

Figure 112012043511012-pat00078

In orthogonal polarization antenna 570 of base station 500, the first element of the s vector

Figure 112012043511012-pat00079
Transmitted through the directional polarization antenna element, the second element of the vector s
Figure 112012043511012-pat00080
Transmitted through the directional polarization antenna element.

Orthogonal polarization antenna 570 is composed of two orthogonal linearly polarized antenna elements (571, 573), each linearly polarized antenna element (571, 573) is independently provided an input signal, depending on the radiation structure of the antenna Generate orthogonal linear polarizations.

5 is a flowchart illustrating a wireless communication method using adaptive transmission polarization control according to another embodiment of the present invention.

First, a base station and a set of polarization state matrices composed of a plurality of polarization state matrices as shown in Equation 10

Figure 112012043511012-pat00081
Promise in advance (S501).

The base station transmits different reference signals RS to all terminals in the cell through two orthogonal linearly polarized antenna elements for downlink polarization channel estimation of each terminal (S503).

Each terminal estimates a downlink polarization channel matrix based on the received reference signal RS (S505).

In addition, each UE is a set of polarization state matrices for an optimal TPS that can be optimally matched to a downlink channel based on the estimated downlink polarization channel matrix.

Figure 112012043511012-pat00082
Determine (PMI and PPI selection) (S507).

In addition, each terminal obtains a CQI based on a signal-to-interference and noise ratio that can be received using the selected optimal TPS vector (S509).

Thereafter, each terminal feeds back PMI, PPI information, and CQI information to the base station (S511).

The base station selects two terminals that satisfies a given scheduling criterion while simultaneously using the PMI and PPI information and the CQI information of the optimal TPS vector fed back from each terminal and maximize the data rate of the data streams to be transmitted (S513).

 In addition, the base station determines the MCS of the data stream to be transmitted to each of the two selected terminals (S515).

Thereafter, the base station generates a symbol by performing encoding and modulation according to the determined MCS of each terminal and provides a transport layer composed of the generated symbols (S517).

In addition, the base station controls (precodes) the amplitude and phase of the signal provided to the orthogonal linearly polarized antenna element so that the configured transmission layer is transmitted at the optimal TPS of the corresponding terminal. The signal is formed (S519).

Thereafter, the base station transmits two orthogonal linearly polarized signals to two terminals through the orthogonal polarization antenna (S521).

Hereinafter, with reference to FIGS. 6 to 8, a space-polarization that optimally combines a polarization division multiple access method and a space division multiple access method in a wireless communication method using adaptive transmission polarization control according to another embodiment of the present invention. The division multiple access method will be described.

In space and polarization division multiple access (SPDMA), which is a wireless communication method using adaptive transmission polarization control according to another embodiment of the present invention, a base station uses space division multiple access as many as the number of orthogonal polarization antennas. By forming up to two polarization channels for each spatial channel formed by the, it is possible to simultaneously transmit data to the terminals corresponding to up to twice the number of orthogonal polarization antennas. According to the present invention, the conventional space division multiple access technology may be optimally combined with the aforementioned polarization division multiple access technology to provide uplink transmission capacity up to twice as large as that of the conventional space division multiple access technology.

6 is an exemplary diagram illustrating an array antenna configuration of a base station performing space-polarization division multiple access according to another embodiment of the present invention.

Referring to FIG. 6, the base station may use a transmission array antenna composed of n T orthogonal polarization antennas, as shown in FIG.

Figure 112012043511012-pat00083
With directional polarization
Figure 112012043511012-pat00084
Directional polarization can be transmitted. That is, the present invention assumes a general case where the transmission polarization direction of the transmission array antenna is different for each orthogonal polarization antenna.

In addition, each terminal may use a reception array antenna composed of n R orthogonal polarization antennas as shown in FIG. 6 (b), and in the a th orthogonal polarization antenna of the reception array antenna, two orthogonal antennas are used for signal reception.

Figure 112012043511012-pat00085
With directional polarization
Figure 112012043511012-pat00086
Directional polarization can be received. That is, in the present invention, it is assumed that the reception polarization direction of one terminal is different for each orthogonal polarization antenna of the reception array antenna.

The 2n T linearly polarized signals transmitted through the orthogonal polarization array antennas of the base station are received by the n R orthogonal polarization antennas of each terminal after undergoing multipath fading of the radio channel. The radio channel between the base station and the k-th terminal can be expressed as Equation (14).

Figure 112012043511012-pat00087

In Equation 14,

Figure 112012043511012-pat00088
Is the two orthogonal polarization antennas transmitted from the b < th >
Figure 112012043511012-pat00089
Directional polarization and
Figure 112012043511012-pat00090
The directional polarization of the a th orthogonal polarization antenna of the k th terminal
Figure 112012043511012-pat00091
Direction and
Figure 112012043511012-pat00092
Represents a polarization channel matrix received with directional polarization.

In the space-polarization division multiple access according to the present invention, the base station simultaneously transmits 2n T (ie, n T groups of two orthogonal linear polarizations) linearly polarized, and the terminal is 2n R (ie, two orthogonal It receives over the prior polarization of the linearly polarized n R groups). Accordingly, downlink data can be simultaneously transmitted to up to 2n T terminals in a two-dimensional domain of space and polarization through a multiple access technique.

The base station uses a 2n 2n × T T the size of the precoding matrix F to the pre-coding a transmit T 2n layers. In the present invention, the precoding matrix F is configured in a hierarchical form as shown in equation (15).

Figure 112012043511012-pat00093

In Equation 15, the precoding vector

Figure 112012043511012-pat00094
And
Figure 112012043511012-pat00095
Each has a size of 2n T × 1, and is a vector for precoding one layer.
Figure 112012043511012-pat00096
And
Figure 112012043511012-pat00097
Is a 2 × 1 polarization match vector for matching orthogonal polarizations transmitted from n T orthogonal polarization antennas.
Figure 112012043511012-pat00098
Wow
Figure 112012043511012-pat00099
The elements of the spatial weight vector c m to compensate for the channel difference between spatially separated orthogonal polarization antennas
Figure 112012043511012-pat00100
Are multiplied by each. Where, T n consists of one element n T × 1 vector of a size that
Figure 112012043511012-pat00101
Is defined as a spatial weight vector for compensating for channel differences between spatially separated quadrature antennas. n T spatial weight vectors
Figure 112012043511012-pat00102
Is used for spatial multiple access (SDMA), which forms up to n T spatial channels.

Thus, the space according to another embodiment of the present invention polarization division multiple access (SPDMA) in precoding of 2n T of 2n T × 1 size for precoding a 2n T layers vectors 2n T of polarization matching vector (

Figure 112012043511012-pat00103
) And n T spatial weight vectors (
Figure 112012043511012-pat00104
) Are combined and organized as shown in Equation (15).

The spatial weight vector c m may be selected from a weight vector codebook for space division multiple access (SDMA) previously scheduled to be optimized for a downlink spatial channel from the n T orthogonal polarization antennas of the base station to the corresponding terminal.

Each terminal for spatial weight vector determination, it is possible to use a codebook with MIMO techniques proposed in the existing 3GPP (3 rd Generation Partnership Project) LTE (Long Term Evolution) system. When the terminal uses a Discrete Fourier Transform (DFT) codebook of the LTE system, a codebook consisting of N n T × n T precoding matrices

Figure 112012043511012-pat00105
Can be assumed.

Here, C n is composed of n T orthogonal vectors,

Figure 112012043511012-pat00106
It is desirable to be designed to simulate well. In addition, the polarization match vector of the transmit orthogonal polarization antenna element
Figure 112012043511012-pat00107
Wow
Figure 112012043511012-pat00108
Is the aforementioned polarization matrix set
Figure 112012043511012-pat00109
You can choose from.

Therefore, polarization state matrix set in space-polarization division multiple access according to another embodiment of the present invention.

Figure 112012043511012-pat00110
Precoder Codebook for Multiplexing and Space Division Multiple Access
Figure 112012043511012-pat00111
New space-polarized weight vector codebook by combining
Figure 112012043511012-pat00112
Can be promised in advance between the base station and the terminals.

7 is a block diagram illustrating a wireless communication apparatus for performing space-polarization division multiple access using adaptive polarization control according to another embodiment of the present invention.

7, the base station 800 is of a 2n T transmitted from the 2n T transmit the linearly polarized wave signal, and each terminal is a base station 800 via the n R orthogonal polarized antenna through n T orthogonal polarized antenna Receive a linearly polarized signal. Here, 2n T linearly polarized signals transmitted from the base station 800 are received by each terminal after undergoing multipath fading of the radio channel.

Each UE may include n R orthogonal polarization antennas 710, a channel state estimator 730, a space-polarization weight selector 750, and a CQI estimator 770.

The n R orthogonal polarization antennas 710 provided in each terminal may be composed of two orthogonal linear polarization antenna elements, respectively, and receive 2n T reference signals RS transmitted from the base station 800, The received reference signal is provided to the channel state estimator 730.

The channel state estimator 730 of each terminal estimates the downlink space-polarized channel matrix as shown in Equation 14 based on the reference signal RS provided from the orthogonal polarization antenna 710, respectively.

The space-polarization weight selection unit 750 of each terminal uses the estimated radio channel matrix to estimate a space-polarization weight vector f k having a 2n T × 1 size that best fits a given selection criterion. Vector codebook

Figure 112012043511012-pat00113
Choose from.

Here, the space-polarization weight selection unit 750 of each terminal represents a polarization match vector having 2n T 2 × 1 magnitudes in the selected weight vector f k .

Figure 112012043511012-pat00114
PMI
Figure 112012043511012-pat00115
And PPI
Figure 112012043511012-pat00116
Feeds back to the base station 800 through the uplink.

In addition, the space-polarization weight selection unit 750 of each terminal is a precoder codebook for spatial division multiple access (SDMA) representing one n T x1 spatial weight vector in the selected weight vector f k .

Figure 112012043511012-pat00117
The PMI d k and the selected vector index (hereinafter, referred to as 'PVI') v k are fed back to the base station 800 through uplink.

In the space-polarization division multiple access according to another embodiment of the present invention, the optimal space-polarization weight vector selected by the terminal is divided into a polarization weight vector and a spatial weight vector and systematically fed back to the base station 800. According to the present invention, the amount of information required for selecting the optimal polarization match vector and the spatial weight vector performed by the terminal can be reduced and the amount of information required for the feedback can be reduced to the minimum.

In addition, the CQI estimator 770 of each terminal calculates a receivable signal-to-interference noise ratio using the selected optimal space-polarization weight vector, and transmits the received signal-to-interference noise ratio to the base station 800 through the uplink feedback channel as CQI information.

The base station 800 may include a scheduler 810, a plurality of code and modulators 830, a plurality of space-polarized precoders 850, and a plurality of quadrature polarized antennas 870.

The scheduler 810 uses the PMI and PPI information of the polarization match vector fed back from each terminal and the PMI and PVI information and CQI information of the spatial weight vector to satisfy a given scheduling criterion. A maximum of 2n T terminals 700-1 and 700-2n T are selected.

In addition, the scheduler 810 determines the MCS of the data stream transmitted to each selected terminal for each selected terminal.

The plurality of codes and modulators 830 generate symbols by performing encoding and modulation on the basis of MCS information of each of the selected terminals 700-1 and 700-2n T provided from the scheduler 810, respectively. Provides a transport layer consisting of.

The plurality of space-polarized precoders 850 may transmit 2n T orthogonal linearities such that a transport layer provided from the corresponding code and modulator 830 of the plurality of code and modulators 830 is transmitted with an optimal space-polarization weight of the corresponding terminal. Control the amplitude and phase of the signal provided to the polarized antenna elements.

The plurality of orthogonal polarization antennas 870 are each composed of two orthogonal linearly polarized antenna elements. Each linearly polarized antenna element space-polarization being independently providing an input signal from the pre-coder 850, through the n T orthogonal polarized antenna by radiating to generate a linear polarization that two orthogonal in accordance with the radial structure of the antenna 2n T Transport layers

8 is a flowchart illustrating a space-polarization division multiple access method using adaptive polarization control according to another embodiment of the present invention.

Referring to FIG. 8, first, a base station 800 and a plurality of terminals have a polarization state matrix set.

Figure 112012043511012-pat00118
Precoder Codebook for Multiplexing and Space Division Multiple Access
Figure 112012043511012-pat00119
New space-polarized weight vector codebook by combining
Figure 112012043511012-pat00120
Define (S801).

The base station 800 transmits to all terminals in the cell of a 2n T, respectively different reference signal (RS) through the n T linearly polarized antenna to estimate a downlink biased channel of each terminal (S803).

Each terminal estimates the downlink space-polarization channel matrix based on the reference signal RS received from the base station 800 (S805).

In addition, each terminal is a predefined space-polarization weight vector codebook for a space-polarization weight vector that can be optimally matched to a downlink channel based on the estimated downlink space-polarization channel matrix.

Figure 112012043511012-pat00121
Choose from. Here, each terminal selects the polarization weight vector PMI and PPI and the spatial weight vector PMI and PVI (S807).

In addition, each terminal obtains a CQI based on a signal-to-interference and noise ratio that can be received using the selected space-polarization weight vector (S809).

Thereafter, each terminal feeds back the polarization weight vector PMI and PPI and the spatial weight vector PMI and PVI and CQI information to the base station 800 (S811).

The base station 800 selects 2n T terminals so that the sum of transmission rates of data streams transmitted simultaneously is maximum while satisfying a given scheduling criterion based on the space-polarization weight vector and CQI information fed back from each terminal (S813). ).

In addition, the base station 800 determines the MCS of the data stream to be transmitted to each of the selected 2n T terminals (S815).

Thereafter, the base station 800 generates a symbol by performing encoding and modulation according to the determined MCS of each terminal, and provides a transport layer composed of the generated symbols (S817).

In addition, the base station 800 of 2n T having the polarization direction is optimized for each terminal to control the amplitude and phase of the signal provided to the 2n T orthogonal linearly polarized antenna elements to be sent to the transport layer comprised of optimal TPS of the terminal Orthogonal linearly polarized signal is formed (S819).

Then, the base station 800 transmits a 2n T orthogonal linearly polarized signals to T 2n of terminals through n T orthogonal polarized antenna (S821).

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

100, 400-1, 400-2, 700-1, 700-2: terminal
110, 410, 710: orthogonal polarized antenna
111, 113, 411, 413: Orthogonal Linearly Polarized Antenna Element
130, 430, 730: channel state estimator
150, 450: transmission polarization state selection unit
170, 470, 770: CQI estimator
200, 500, 800: base station
210, 510, 810: Scheduler
230, 530, 830: code and modulator
250, 550: Transmission polarization state control unit
270, 570, 870: orthogonal polarized antenna
271, 273, 571, 573: Orthogonal Linearly Polarized Antenna Element
750: space-polarization weight selection unit
850: Space-polarized precoder

Claims (15)

Orthogonal polarization antenna for receiving at least one reference signal;
A channel state estimator for estimating a radio polarization channel based on the reference signal; And
A transmission polarization state selection unit for selecting a transmission polarization state corresponding to the estimated wireless polarization channel among a plurality of predefined transmission polarization states, and feeding back an index for the plurality of predefined transmission polarization states;
The transmit polarization state includes a complex weight for determining magnitude and phase of at least two orthogonal polarization signals,
The transmission polarization state capable of maximizing downlink transmission power or data rate is selected according to the following equation,
Figure 112018113352783-pat00130

Where m k denotes a matrix index including a transmission polarization state selected by the k-th wireless communication device, χ k denotes a polarization index selected by the k-th wireless communication device, and an optimal transmission polarization index P m k is And a vector closest to a maximum singular vector v k of a polarization channel matrix H k selected from a plurality of predefined transmission polarization states. The method according to claim 1,
And the transmission polarization state selection unit selects a transmission polarization state that maximizes a data rate among the plurality of transmission polarization states, and feeds back an indicator of the selected transmission polarization state. The method according to claim 1,
And a channel state information estimator configured to calculate a signal to interference noise ratio or data rate that can be received using the selected transmission polarization state, and to feed back the calculated signal to interference noise ratio or data rate as channel state information. . The method according to claim 1,
The predefined plurality of transmission polarization states are composed of a plurality of polarization state matrices, and the transmission polarization state selection unit selects one polarization state matrix among the plurality of transmission polarization state matrices and configures the selected one polarization state matrix. And selecting one of two orthogonal polarization vectors. The method according to claim 4,
And wherein the transmission polarization state selection unit feeds back a preferred matrix index indicating a selected polarization state matrix and a preferred polarization index indicating a selected polarization vector. At least one orthogonal polarization antenna, each receiving at least one reference signal;
A channel state estimator for estimating a space-polarized channel based on the reference signal; And
A space-polarization weight selection unit for selecting a space-polarization weight corresponding to the estimated space-polarization channel from a predefined space-polarization weight vector codebook, and feeding back the selected space-polarization weight information;
The space-polarization weight information selected includes a matrix index indicating a transmission polarization state selected by the space-polarization weight selection unit, and a polarization index,
The transmit polarization state includes a complex weight for determining magnitude and phase of at least two orthogonal polarization signals,
The transmission polarization state capable of maximizing downlink transmission power or data rate is selected according to the following equation,
Figure 112018113352783-pat00131

Where m k denotes a matrix index including a transmission polarization state selected by the k-th wireless communication device, χ k denotes a polarization index selected by the k-th wireless communication device, and an optimal transmission polarization index P m k is And a vector closest to a maximum singular vector v k of a polarization channel matrix H k selected from a plurality of predefined transmission polarization states. In claim 6,
The predefined space-polarization weight vector codebook is formed by combining a polarization state matrix set and a precoder codebook for spatial division multiple access. In claim 6,
And the space-polarization weight selector feeds back an index corresponding to a polarization weight vector selected from the space-polarization weight vector codebook and an index corresponding to the selected spatial weight vector. A scheduler that selects at least one receiving device based on at least one of a transmission polarization state index and channel quality information received from at least one receiving device, and determines a modulation and coding scheme of a signal to be transmitted to each of the selected at least one receiving device. ;
A coder and a modulator configured to perform encoding and modulation on the basis of the modulation and coding scheme determined for each of the at least one receiving apparatus to form a transport layer to be transmitted to the at least one receiving apparatus, respectively;
A transmission polarization state control unit controlling polarization of a transmission layer to be transmitted to each of the selected at least one receiving device based on an index of a plurality of predefined transmission polarization states received from the at least one receiving device; And
Each comprising two orthogonal polarization antenna elements, and including at least one orthogonal polarization antenna radiating at least one transmission layer with polarization controlled through each orthogonal polarization antenna element,
The at least one receiving apparatus selects a transmission polarization state capable of maximizing downlink transmission power or data transmission rate according to the following equation,
Figure 112018113352783-pat00132

Where m k denotes a matrix index including a transmission polarization state selected by a k-th receiver, χ k denotes a polarization index selected by a k-th receiver, and an optimal transmission polarization index P m k is defined above. Is equal to the closest vector to the maximum singular vector v k of the polarization channel matrix H k selected from the plurality of transmitted polarization states,
Wherein the transmit polarization state comprises a complex weight for determining the magnitude and phase of at least two orthogonal polarization signals. The method according to claim 9,
The scheduler selects two terminals having a maximum transmission rate sum of data to be transmitted simultaneously based on at least one of transmission polarization state information and channel quality information respectively received from a plurality of receiving apparatuses, and simultaneously transmits them to the selected two terminals. And transmitting data to two orthogonal polarization antenna elements constituting one orthogonal polarization antenna, respectively. The method according to claim 9,
The scheduler selects twice the number of orthogonal polarization antennas for a terminal having a maximum transmission rate of data to be transmitted simultaneously based on at least one of transmission polarization state information and channel quality information respectively received from a plurality of receiving apparatuses. Characterized in that the wireless communication device. Estimating a radio polarization channel based on the received reference signal;
Selecting a transmission polarization state from among a plurality of predefined transmission polarization states based on the estimated radio polarization channel;
Transmitting indexes for the predefined plurality of transmit polarization states indicating the selected transmit polarization state; And
Selecting a transmission polarization state capable of maximizing downlink transmission power or data transmission rate according to the following equation;
Figure 112018113352783-pat00133

Here, m k denotes a matrix index including a transmission polarization state selected by the k-th terminal, χ k denotes a polarization index selected by the k-th terminal, and an optimal transmission polarization index P m k is the predefined plurality Is equal to the vector closest to the maximum singular vector v k of the polarization channel matrix H k selected from the transmission polarization states of
Wherein the transmit polarization state comprises a complex weight for determining the magnitude and phase of at least two orthogonal polarization signals. In claim 12,
The predefined plurality of transmission polarization states are composed of a plurality of polarization state matrices, and the indication information indicating the transmission polarization state includes an index indicating a selected polarization state matrix among the plurality of polarization state matrices; Wireless polarization index information indicating the selected polarization vector (preferred polarization index) method. Estimating the space-polarized channel based on the received at least one reference signal;
Selecting space-polarization weight information corresponding to the estimated space-polarization channel from a predefined space-polarization weight vector codebook; And
Transmitting the selected space-polarization weight information;
The space-polarization weight information selected includes a matrix index indicating a transmission polarization state, and a polarization index,
The indicated transmission polarization state may maximize downlink transmission power or data rate according to the following equation,
Figure 112018113352783-pat00134

Here, m k denotes a matrix index including a transmission polarization state selected by the k-th terminal, χ k denotes a polarization index selected by the k-th terminal, and an optimal transmission polarization index P m k is the predefined plurality And a vector closest to the maximum singular vector v k of the polarization channel matrix H k selected from the transmission polarization states of. Selecting at least one receiving device based on at least one of a transmission polarization state index and channel quality information received from the at least one receiving device;
Determining a modulation and coding scheme of a signal to be transmitted to each of the selected at least one receiving device;
Configuring a transmission layer to be transmitted to the at least one receiving device by performing encoding and modulation on the basis of the modulation and coding scheme determined for each of the at least one receiving device;
Controlling polarization of a transmission layer to be transmitted to each of the selected at least one receiving device based on the transmission polarization state index received from the at least one receiving device; And
Transmitting each of the polarized-controlled transport layers using orthogonal polarization,
The transmission polarization state includes a complex weight for determining magnitude and phase of at least two polarization signals,
The at least one receiving apparatus selects a transmission polarization state capable of maximizing downlink transmission power or data transmission rate according to the following equation,
Figure 112019502539727-pat00135

Where m k denotes a matrix index including a transmission polarization state selected by a k-th receiver, χ k denotes a polarization index selected by a k-th receiver, and an optimal transmission polarization index P m k is predefined And (i) the same as the vector closest to the maximum singular vector v k of the polarization channel matrix H k selected from the plurality of transmit polarization states.
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