KR20210001828A - Apparatus for estimating position of receiver and method thereof - Google Patents

Abstract

The present invention relates to a device for estimating a location of a receiver and a method thereof. According to one embodiment, the device for estimating the location comprises: a reception unit receiving information on a plurality of beams radiated at different radiation angles from a transmitter; a radiation pattern reading unit reading radiation pattern information corresponding to each of the plurality of beams based on the information on the plurality of beams; and a location estimation unit comparing each of the read radiation pattern information with each other and estimating a location of the receiver based on the comparison result.

Description

An apparatus for estimating a position of a receiver, and a method thereof TECHNICAL FIELD

The present invention relates to an apparatus and a method for estimating the position of a receiver, and more particularly, to a technical idea of estimating the position of a receiver using radiation pattern information of a beam emitted from a transmitter.

In order to transmit a signal by applying a beamforming technique, the position of the receiver needs to be estimated.

Accordingly, in the existing position estimation technology, a beam management method, which is one of 5G technologies, is used.

Specifically, in the beam management scheme, the base station sets a beam interval and transmits beams sequentially at a specific angle, the receiver reports the received RSRP (reference signal received power) information for each angle, and then the base station has the highest RSRP value. It is a method of transmitting at a large angle.

In addition to the above-described beam management method, beams are sequentially transmitted at a predetermined angle, and after RSRP information is reported by the receiver, the RSRP value is used as a weighting factor for the angles of two beams with a large RSRP value, and the beam is transmitted at the corresponding angle. A method of improving the accuracy of estimation has been proposed.

However, the method in which the largest RSRP is transmitted at the measured beam angle has a large error in the position of the actual receiver, so the exact position cannot be estimated, and the method using the weight coefficient does not take into account the radiation pattern transmitted through the actual antenna. There is a problem of not being able to estimate the exact location. Therefore, there is a need to devise a more accurate method than the existing position estimation method.

Korean Patent Registration No. 10-1916636 "Wireless power transmission apparatus and method for transmitting wireless power by checking the location of the receiver"

An object of the present invention is to provide a position estimation apparatus and method capable of estimating the position of a receiver by comparing radiation pattern information corresponding to a plurality of beams radiated at different random radiation angles from a transmitter.

An object of the present invention is to provide a position estimation apparatus and method capable of more accurately estimating the position of a receiver with only two beams radiated from a transmitter at different random radiation angles.

In addition, the present invention transmits only two beams and compares the received values thereof to estimate the position of the receiver in all directions based on the position of the transmitter, thereby reducing the complexity of position estimation and a position estimating device capable of quickly estimating the position. I want to provide you with that.

A position estimation apparatus according to an embodiment includes a receiver for receiving information on a plurality of beams radiated at different radiation angles from a transmitter, and radiation pattern information corresponding to each of the plurality of beams based on information on the plurality of beams. It may include a radiation pattern reading unit that reads out and a position estimation unit that compares each of the read radiation pattern information with each other, and estimates a position of the receiver based on the comparison result.

According to one side, the information on the plurality of beams may include a size of a radiation angle of each of the plurality of beams and a received power value of a receiver corresponding to each of the plurality of beams.

According to one side, the radiation pattern reading unit stores radiation pattern information corresponding to each of m (where m is a positive integer) beams radiated from the transmitter at different radiation angles in advance, and among the previously stored radiation pattern information Radiation pattern information corresponding to information on a plurality of beams can be read.

According to one side, the position estimation unit calculates an antenna gain corresponding to each of the read radiation pattern information, subtracts each decibel (dB) value of the calculated antenna gain from each other, and calculates a preset value among the total result values according to the subtraction result. An angle corresponding to the result value having the result value may be calculated, and the angle corresponding to the calculated result value may be estimated as an angle between the transmitter and the receiver.

According to one side, when a plurality of result values having preset values according to subtraction of each of the decibel (dB) values of the antenna gain corresponding to the first beam and the second beam are calculated, the position estimating unit Any one value corresponding to the subtraction result of each of the decibel (dB) value of the antenna gain of the first beam and the second beam and the decibel (dB) value of the antenna gain of the third beam is calculated, and any one calculated value The angle corresponding to can be estimated as the angle between the transmitter and the receiver.

According to one side, the position estimating unit reflects the received power value corresponding to the first beam and the decibel (dB) of the antenna gain corresponding to the second beam, and the received power value corresponding to the second beam corresponds to the first beam. The angle between the transmitter and the receiver may be estimated based on a value at which the result of subtracting a value reflecting the decibel (dB) of the antenna gain is minimized.

According to one side, the radiation pattern reading unit may calculate two beams having the largest reception power value among the plurality of beams, and read radiation pattern information corresponding to each of the calculated two beams.

및

(여기서,

<

)인 경우,

내지

(여기서,

는 산출된 두개의 빔간 간격)의 방사각 범위 내에서 수신기의 위치를 추정할 수 있다. According to one side, the position estimation unit calculates the radiation angle of each of the two beams

And

(here,

<

),

To

(here,

The position of the receiver can be estimated within the radiation angle range of the calculated interval between two beams.

A method for estimating a position according to an embodiment includes the steps of receiving information on a plurality of beams radiated at different radiation angles from a transmitter in a receiver, and a radiation pattern reader based on information on the plurality of beams, It may include reading radiation pattern information corresponding to each, comparing each of the radiation pattern information read by the position estimating unit with each other, and estimating the position of the receiver based on the comparison result.

According to one side, the information on the plurality of beams may include a size of a radiation angle of each of the plurality of beams and a received power value of a receiver corresponding to each of the plurality of beams.

According to one side, the step of estimating the position of the receiver is to calculate an antenna gain corresponding to each of the read radiation pattern information, subtract each decibel (dB) value of the calculated antenna gain from each other, and the total result value according to the subtraction result. An angle corresponding to a result value having a predetermined value may be calculated, and an angle corresponding to the calculated result value may be estimated as an angle between the transmitter and the receiver.

According to one side, in the step of reading the radiation pattern information, two beams having the largest received power values among the plurality of beams may be calculated, and radiation pattern information corresponding to each of the calculated two beams may be read.

According to an embodiment, the location of the receiver may be estimated by comparing radiation pattern information corresponding to a plurality of beams radiated from the transmitter at different random radiation angles.

According to an embodiment, it is possible to more accurately estimate the position of the receiver with only two beams radiated from the transmitter at different random radiation angles.

According to an embodiment, by estimating the position of the receiver in all directions based on the position of the transmitter by transmitting only two beams and comparing received values thereof, the complexity of position estimation can be reduced and the position can be estimated more quickly.

1 is a diagram for describing a position estimation apparatus according to an exemplary embodiment.
2 is a view for explaining an example of radiation pattern information described through a position estimation apparatus according to an embodiment.
3A to 3B illustrate an example of estimating a location of a receiver using a location estimation apparatus according to an embodiment.
4A to 4D are diagrams for explaining position estimation performance of a position estimation apparatus according to an exemplary embodiment.
5 is a diagram for describing a method of estimating a location according to an embodiment.

Specific structural or functional descriptions of the embodiments according to the concept of the present invention disclosed in this specification are exemplified only for the purpose of describing the embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention They may be implemented in various forms and are not limited to the embodiments described herein.

Since the embodiments according to the concept of the present invention can apply various changes and have various forms, the embodiments will be illustrated in the drawings and described in detail herein. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and includes changes, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first or second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are only for the purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, the first component may be named as the second component, Similarly, the second component may also be referred to as a first component.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle. Expressions describing the relationship between components, for example, "between" and "just between" or "directly adjacent to" should be interpreted as well.

The terms used in the present specification are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate that the specified features, numbers, steps, actions, components, parts, or combinations thereof exist, but one or more other features or numbers, It is to be understood that the presence or addition of steps, actions, components, parts, or combinations thereof, does not preclude the possibility of preliminary exclusion.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this specification. Does not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these embodiments. The same reference numerals in each drawing indicate the same members.

1 is a diagram for describing a position estimation apparatus according to an exemplary embodiment.

Referring to FIG. 1, the position estimating apparatus 100 according to an embodiment may estimate a location of a receiver by comparing radiation pattern information corresponding to a plurality of beams radiated from a transmitter at different random radiation angles. .

In addition, the position estimating apparatus 100 may more accurately estimate the position of the receiver with only two beams radiated from the transmitter at different random radiation angles.

In addition, the position estimation apparatus 100 transmits only two beams and compares the received values thereof to estimate the position of the receiver in all directions based on the position of the transmitter, thereby reducing the complexity of position estimation and can estimate the position more quickly. .

To this end, the position estimation apparatus 100 may include a receiving unit 110, a radiation pattern reading unit 120, and a position estimating unit 130.

In addition, the position estimating apparatus 100 may further include a control unit 140 that controls operations of the receiving unit 110, the radiation pattern reading unit 120, and the position estimating unit 130.

According to one side, the controller 140 may generate a control signal for controlling the transmitter to emit a plurality of beams, and may transmit the generated control signal to the transmitter.

For example, the position estimating apparatus 100 may be applied to a signal transmission system or a wireless power transmission system using beamforming, and may be implemented as a position estimation algorithm that estimates the position of a receiver.

In addition, the location estimation apparatus 100 may be provided in the transmitter, or may be implemented as a separate device independent from the transmitter.

The'angle' described below may be interpreted as an angle formed from a virtual reference line set in an arbitrary direction from the location of the transmitter.

As an example, the'radiation angle' described below can be interpreted as an angle formed between the beam emitted from the transmitter and the virtual reference line, and the'angle between the transmitter and the receiver' is a link between the position of the transmitter and the receiver. It can be interpreted as an angle formed between a straight line and an imaginary reference line.

Specifically, the reception unit 110 according to an embodiment may receive information on a plurality of beams radiated at different radiation angles from the transmitter.

In other words, the receiving unit 110 may receive information on at least two or more beams (first to nth beams, where n is a positive integer) radiated from the transmitter.

According to one side, the information on the plurality of beams may include a size of a radiation angle of each of the plurality of beams and a received power value of a receiver corresponding to each of the plurality of beams.

In other words, the receiver 110 may receive a received power value corresponding to each of the plurality of beams from the receiver.

For a more specific example, when there are two beams, the receiver 110 sequentially receives a received power value corresponding to each of the two beams from the receiver when the transmitter radiates the two beams sequentially at regular intervals. I can.

The radiation pattern reading unit 120 according to an exemplary embodiment may read radiation pattern information corresponding to each of the plurality of beams based on information on the plurality of beams.

According to one side, the radiation pattern reading unit 120 may pre-store radiation pattern information corresponding to each of m (here, m is a positive integer) beams radiated from the transmitter at different radiation angles. In addition, the radiation pattern reading unit 120 may read radiation pattern information corresponding to information on a plurality of beams among previously stored radiation pattern information.

In other words, the radiation pattern reading unit 120 may collect and store radiation pattern information corresponding to each of m beams radiated at different radiation angles at all angles (0° to 360°) with respect to the transmitter. In addition, radiation pattern information corresponding to information on a plurality of beams can be read (read) from among the previously stored radiation pattern information.

That is, the position estimating apparatus 100 according to an embodiment may receive radiation pattern information for all beams formed in each direction from a transmission antenna of a transmitter, where the radiation pattern information may be formed with a specific radiation angle. It may be an antenna gain calculated at all angles corresponding to the formed beam.

For a more specific example, when the radiation angle of the beam radiated from the transmitter is 0°, the radiation pattern information is all antenna gain values corresponding to the beam radiated at a radiation angle of 0° within the range of -90° to 90°. It may include.

The position estimating unit 130 according to an embodiment may compare each of the radiation pattern information read through the radiation pattern reading unit 120 with each other, and estimate the position of the receiver based on the comparison result.

According to one side, the position estimating unit 130 may calculate an antenna gain corresponding to each of the read radiation pattern information, and subtract each decibel (dB) value of the calculated antenna gain from each other.

In addition, the position estimating unit 130 calculates an angle corresponding to a result value having a preset value among the total result values according to the subtraction result, and estimates the angle corresponding to the calculated result value as an angle between the transmitter and the receiver. I can. For example, the preset value may mean the minimum value among all result values.

)에 관한 정보를 산출해야 하지만 송신기에서 하나의 빔 만을 일정 각도로 전송한다고 하면, 거리(r)과 각도(

)를 모두 알아낼 수 없으나 또 하나의 빔을 다른 방사각으로 전송하게 되면 거리(r)과 각도(

)를 모두 알아낼 수 있다. More specifically, to determine the location of the receiver, the distance r between the transmitter and the receiver and the angle between the transmitter and the receiver (

), but if the transmitter transmits only one beam at a certain angle, the distance (r) and the angle (

), but if another beam is transmitted at a different radiation angle, the distance (r) and the angle (

) Can be found out.

Equation 1 below represents an RSRP value received from a receiver corresponding to two beams (first to second beams) radiated from the transmitter.

[Equation 1]

은 제1 빔에 대응되는 수신 전력 값을 나타내고,

은 제2 빔에 대응되는 수신 전력 값을 나타내며,

은 제1 빔의 안테나 이득의 데시벨(dB) 값을 나타내고,

은 제2 빔의 안테나 이득의 데시벨(dB) 값을 나타내며,

은 거리 r에 따른 경로손실 값을 나타내고,

은 송신 전력을 나타낼 수 있다. here,

Represents a received power value corresponding to the first beam,

Represents the received power value corresponding to the second beam,

Represents the decibel (dB) value of the antenna gain of the first beam,

Represents the decibel (dB) value of the antenna gain of the second beam,

Represents the path loss value according to the distance r,

May represent the transmit power.

)과 경로손실 값(

)은 서로 동일하다는 점을 이용하면 하기 수학식2를 도출할 수 있다. In addition, in Equation 1, the transmit power (

) And path loss value (

Using the fact that) is the same as each other, the following Equation 2 can be derived.

[Equation 2]

,

) 각각을 감산(

)한 결과 값이 각도

의 크기에 따라 변화하기 때문에, 위치 추정부(130)는 안테나 이득의 데시벨(dB) 값

,

을 비교하여 특정

을 갖는 각도

를 찾을 수 있다. That is, the decibel (dB) value of the antenna gain of the first to second beams (

,

) Subtract each (

) The resulting value is an angle

Because it changes according to the size of, the position estimating unit 130 is a decibel (dB) value of the antenna gain

,

By comparing the specific

Angle with

Can be found.

,

)을 사전에 알고 있기 때문에 모든 각도에 대해

를 만족하는 송신기와 수신기 간의 각도(

)를 산출할 수 있다. Here, the position estimation unit 130 is a decibel (dB) value of the antenna gain through the radiation pattern reading unit 120 (

,

) In advance, so for all angles

The angle between the transmitter and receiver that satisfies (

) Can be calculated.

That is, the position estimating unit 130 according to an embodiment may estimate the position of the receiver by randomly selecting only two beams radiated from the transmitter at different radiation angles.

,

)을 산출하고, 산출된 안테나 이득의 데시벨(dB) 값(

,

) 각각을 서로 감산(

)하며, 감산 결과가 최소가 되는 지점에서의 각도를 송신기와 수신기간의 각도(

)로 추정할 수 있다. For a more specific example, the position estimating unit 130 includes a decibel (dB) value of the antenna gain corresponding to each of the radiation pattern information for the first to second beams (

,

), and the decibel (dB) value of the calculated antenna gain (

,

) Subtract each from each other (

), and the angle between the transmitter and the receiver (

) Can be estimated.

)에 따른 '기설정된 값을 갖는 결과 값'이 복수 개가 산출되면, 산출된 복수 개의 결과 값 중 제1 내지 제2 빔의 안테나 이득의 데시벨(dB) 값(

,

)과 제3 빔의 안테나 이득의 데시벨(dB) 값(

) 각각의 감산 결과(

,

)에 대응되는 어느 하나의 값을 산출하고, 산출된 어느 하나의 값에 대응되는 각도를 송신기와 수신기간의 각도(

)로 추정할 수 있다. According to one side, the position estimating unit 130 subtracts each decibel (dB) value of the antenna gain corresponding to the first to second beams (

When a plurality of'result values having a preset value' according to) are calculated, a decibel (dB) value of the antenna gain of the first to second beams among the calculated result values (

,

) And the decibel (dB) value of the antenna gain of the third beam (

) Each subtraction result (

,

Calculate any one value corresponding to ), and determine the angle corresponding to any one calculated value between the transmitter and the receiver (

) Can be estimated.

More specifically, the position estimating apparatus 100 according to an embodiment receives a feedback signal reflecting the received power values for each of a plurality of beams from a receiver and estimates the position, and the number of bits of the feedback signal is limited (limited feedback). Therefore, it may not be possible to accurately grasp the received power.

For a more specific example, the feedback signal can represent 1024 (= 2 ¹⁰ ) reception power values when the reception power is fed back with 10 bits, but if feedback is required with only 7 bits, 128 (= 2 ⁷ ) reception power values. Can represent only.

)에 따른 '기설정된 값을 갖는 결과 값'은 하나가 아니라 복수 개가 산출될 수 있다. That is, if the resolution for the received power value is not sufficient, the decibel (dB) value of the antenna gain of the first to second beams is subtracted (

), instead of one'result value having a preset value' may be calculated.

연산에 따른 '기설정된 값을 갖는 결과 값'을 갖는 포인트들이 복수 개가 산출되면, 제어부(140)를 통해 송신기가 제3 빔을 방사하도록 제어할 수 있다. Therefore, the position estimating unit 130 according to an embodiment

When a plurality of points having a'result value having a preset value' according to the calculation are calculated, the transmitter may control to emit a third beam through the controller 140.

연산에 따른 '기설정된 값을 갖는 결과 값'을 갖는 복수의 포인트들과, 방사된 제3 빔의 안테나 이득의 데시벨(dB) 값(

)을 이용한 감산 결과(

,

)를 통해 산출되는 포인트들을 비교하며, 비교 결과를 통해 특정되는 어느 하나의 포인트에 대응되는 각도를 송신기와 수신기간의 각도(

)로 추정할 수 있다.In addition, the location estimation unit 130

A plurality of points having a'result value having a preset value' according to the operation, and a decibel (dB) value of the antenna gain of the radiated third beam (

Subtraction result using (

,

The points calculated through) are compared, and the angle corresponding to any one point specified through the comparison result is determined as the angle between the transmitter and the receiver (

) Can be estimated.

)을 이용한 연산을 통해서도 어느 하나의 포인트를 특정하지 못하면, 하나의 포인트가 특정될 때까지 제4 내지 제n 빔을 이용하여 상술한 특정 동작을 반복할 수 있다. On the other hand, the position estimating unit 130 is a decibel (dB) value of the antenna gain of the third beam (

If any one point is not specified through an operation using ), the above-described specific operation may be repeated using the fourth to nth beams until one point is specified.

According to one side, the position estimator 130 subtracts the received power value corresponding to the second beam from a value reflecting the decibel (dB) value of the antenna gain corresponding to the second beam to the received power value corresponding to the first beam. The angle between the transmitter and the receiver may be estimated based on a value at which the result of subtracting a value reflecting a decibel (dB) value of an antenna gain corresponding to one beam is a minimum.

)와 경로손실 값(

)은 서로 동일하므로, 제1 빔의 수신 전력 값(

)과 제2 빔의 수신 전력 값(

)은 하기 수학식3와 같이 나타낼 수 있으며, 수학식3은 정리하면 수학식4와 같이 표현될 수 있다. More specifically, in Equation 1, the transmit power (

) And path loss value (

) Are the same, so the received power value of the first beam (

) And the received power value of the second beam (

) Can be expressed as Equation 3 below, and Equation 3 can be expressed as Equation 4 in summary.

[Equation 3]

[Equation 4]

)와 안테나 이득의 비(

)가 동일하므로, 일실시예에 따른 위치 추정부(130)는 이를 만족하는 안테나 이득을 찾을 수 있다. According to Equation 3, the received power ratio measured from two beams (first to second beams) (

) And antenna gain ratio (

) Is the same, the position estimating unit 130 according to an embodiment may find an antenna gain satisfying this.

)를 추정할 수 있다. That is, the position estimating unit 130 uses the following Equation 5 derived from Equation 4

) Can be estimated.

[Equation 5]

Meanwhile, the radiation pattern calculation unit 120 may calculate two beams having the largest received power value among the plurality of beams, and calculate radiation pattern information corresponding to each of the calculated two beams.

In other words, the receiver 110 may receive received power values corresponding to each of n (here, n is a positive integer) beams radiated at different radiation angles from the transmitter through beamforming, and the radiation pattern is calculated. The unit 120 may calculate two beams having the largest received power values among received power values corresponding to each of the plurality of beams.

More specifically, when the transmitter emits two or more beams, if all angles are considered, the amount of calculation increases, and thus the position of the receiver can be estimated by selecting two beams having a large reception power value.

In addition, the method of estimating the position using two arbitrary beams is somewhat less accurate due to a very small antenna gain when the receiver is located at a very low side lobe or null point. A dropping problem may occur, but a method of estimating the position using two beams selected according to the received power value can solve this problem.

및

(여기서,

<

)인 경우,

내지

(여기서,

는 산출된 두개의 빔간 간격)의 방사각 범위 내에서 수신기의 위치를 추정할 수 있다. According to one side, the position estimating unit 130 has a radiation angle of each of the two beams having the largest received power value

And

(here,

<

),

To

(here,

The position of the receiver can be estimated within the radiation angle range of the calculated interval between two beams.

)의 탐색 범위를 한정할 수 있다. In other words, when the position estimation unit 130 estimates the position of the receiver, the angle (

) Can be limited.

및

인 경우, 수신기는

내지

의 범위 내에 위치하게 될 가능성이 높으므로, 모든 각도를 고려하는 것은 적합하지 않을 수 있다. More specifically, the transmission angle of two beams with a large received power value reported from the receiver is

And

If the receiver is

To

Since it is likely to be located within the range of, it may not be appropriate to consider all angles.

는

및

에 대응되는 두개의 빔간 간격(각도)으로 설정하였는데, 이는 만약 수신기가

내지

를 벗어난 위치에 있다면

및

로 방사된 빔이 아닌 다른 각도로 방사된 빔에 의해 수신된 전력 값이 더 클 것이기 때문이다.here,

Is

And

The interval (angle) between the two beams corresponding to is set, which is if the receiver

To

If you are in a position outside of

And

This is because the power value received by the beam radiated at an angle other than the radiated beam will be larger.

In summary, Equation 5 can be summarized as Equation 6 below.

[Equation 6]

내지

를 벗어난 위치에 존재하는 경우 수신전력이 가장 클 수 없으므로 수신기가 위치하는 것은 불가능하다고 판단할 수도 있다.In the method of estimating the position using two beams selected according to the received power value, the receiver is located at an angle where the antenna gain value such as a side lobe or null point is very small because the two selected beams have higher reception power than the other It can be judged that it is impossible. Similarly, the receiver

To

If the receiver is located in a position outside of, since the reception power cannot be the greatest, it may be determined that it is impossible to locate the receiver.

2 is a view for explaining an example of radiation pattern information described through a position estimation apparatus according to an embodiment.

Referring to FIG. 2, reference numeral 200 denotes radiation pattern information of a beam radiated from a transmitter at a radiation angle of 0°.

))에 관한 정보를 포함하는 것을 확인할 수 있다. According to reference numeral 200, radiation pattern information corresponds to a beam formed when a beam is formed at a specific radiation angle, and is calculated at all angles.

)).

) 값을 포함할 수 있다.In other words, the radiation pattern information of the beam radiated at a radiation angle of 0° is in the range of -90° to 90°, and all antenna gains according to the radiation pattern (

) Value can be included.

3A to 3B illustrate an example of estimating a location of a receiver using a location estimation apparatus according to an embodiment.

3A to 3B, reference numeral 310 denotes an example of estimating the position of a receiver using two beams selected according to a reception power value in a position estimation apparatus according to an embodiment, and reference numeral 320 denotes an embodiment. An example of estimating the position of a receiver using two arbitrary beams in a position estimation apparatus according to an example is shown.

According to reference numeral 310, the apparatus for estimating a position according to an embodiment includes two beams having the largest received power values among n (where n is a positive integer) beams radiated from a transmitter at different radiation angles through beamforming. The position of the receiver can be estimated using the beam.

More specifically, when the transmitter emits a beam at a radiation angle of -60°, -30°, 0°, 30°, 60°, which is a predefined direction, the position estimation apparatus according to an embodiment A received power value corresponding to each of a plurality of beams radiated in a defined direction may be received.

Next, the position estimation apparatus according to an embodiment may determine that the received power value is the largest when the beam is radiated at a radiation angle of 0° and 30° through the received power value received from the receiver.

In other words, according to the embodiment of reference numeral 310, the two largest values of the received power for the beams of the five radiation angles are values for the radiation angle beams of 0° and 30°, respectively, -22.3494dBm and -24.9516dBm, respectively Can be confirmed.

)을 수행할 수 있으며, 감산 연산 결과 값이 가장 작은 포인트에 대응되는 10°에 수신기가 위치해 있다고 추정할 수 있다. Next, the position estimation apparatus according to an embodiment is a subtraction operation of a decibel (dB) value of an antenna gain corresponding to a beam radiated at a radiation angle of 0° and 30° within a range of -30° to 30° (

) Can be performed, and it can be estimated that the receiver is located at 10° corresponding to the point where the result of the subtraction operation is the smallest.

=10^o 일때의 안테나 이득(-4.2026dB)과 30° 빔에서

=10^o 일때의 안테나 이득(-6.8048dB)의 차가 수신전력 값의 차(2.6022 (= -22.3494 - -24.9516)와 가장 근접한 것을 확인할 수 있다.More specifically, according to the radiation pattern of reference numeral 310, in the 0° beam

Antenna gain at =10 ^o (-4.2026dB) and at 30° beam

It can be seen that the difference in antenna gain (-6.8048dB) at =10 ^o is closest to the difference in received power value (2.6022 (= -22.3494--24.9516)).

As another embodiment, according to the case where the receiver is located at -33 ^o as in (a) of reference numeral 320, the apparatus for estimating a position according to an embodiment is at an arbitrary angle of -30° and -60° from the transmitter. The position of the receiver can be estimated using two beams radiated in a square.

)을 수행할 수 있으며, 감산 연산 결과 값이 가장 작은 포인트에 대응되는 -33°에 수신기가 위치해 있다고 추정할 수 있다.More specifically, the position estimation apparatus according to an embodiment is a subtraction operation of a decibel (dB) value of an antenna gain corresponding to two beams radiated at a radiation angle of -30° and -60° (

) Can be performed, and it can be estimated that the receiver is located at -33° corresponding to the point with the smallest subtraction result.

Similarly, according to (b) to (c) of reference numeral 320, the apparatus for estimating a position according to an embodiment includes two beams radiated at a radiation angle of 30° and 60°, and a radiation angle of 30° and 0°. Using each of the two radiated beams, it can be estimated that the receiver is located at 35° and 40° respectively.

4A to 4D are diagrams for explaining position estimation performance of a position estimation apparatus according to an exemplary embodiment.

4A to 4D, reference numeral 410 denotes a conventional position'a method in which the largest RSRP, which is an estimation method, is transmitted at a measured beam angle (basic)','a method using a weighted factor (weighted combining)' and ' A result of measuring an error in position estimation according to a beam interval using each of'proposed' using a position estimation apparatus according to an embodiment is shown.

Further, reference numeral 420 denotes an error measurement result according to a change in bit resolution using the three methods described above.

Meanwhile, reference numeral 430 denotes an actual beam pattern of the 5.6GHz 8 x 8 antenna, and reference numeral 440 denotes a result of estimating the position of the receiver by applying the actual beam pattern of the reference numeral 430 to the three methods described above.

In reference numeral 410, each method was evaluated using the performance according to the inter-beam spacing and the number of bits used when reporting RSRP.

Here, the reason for considering the inter-beam spacing is that an error in position estimation can be reduced when the beam spacing is narrow, but there is a disadvantage in that it takes a long time and increases the complexity because the number of transmitted beams increases.

On the other hand, if the beam spacing is wide, time and complexity can be reduced, but the probability of the receiver being positioned at a side lobe or a null point increases, resulting in a large error. In addition, the reason for considering the number of bits is that the number of bits used when the receiver feeds back the RSRP value is limited, and thus an accurate value may not be transmitted. In order to see the robustness of the algorithm against errors caused by this reason, two evaluation criteria were selected and the results were examined.

According to reference numeral 410, as a result of examining the angle estimation error according to the three methods described above while increasing the inter-beam spacing (angle) for position estimation, the proposed method (proposed) is basically more than the conventional method (basic, weighted combining). It can be seen that it has a lower error.

According to reference numerals 420 to 440, as a result of examining the angle estimation error according to the number of bits used when reporting the RSRP, the transmission of RSRP in the simulation is that a value between -5dB and -140dB is quantized and transmitted according to the number of bits. Assumed.

Specifically, in the case of 5 bits or more, the weighted combining scheme has better performance than the proposed scheme. However, in the case of more than 7 bits, as the number of bits increases, the proposed scheme has better performance than the existing scheme (basic, weighted combining).

In addition, the proposed scheme can estimate the position of the transmitter to which the receiver is connected without the need to communicate with multiple transmitters.

Therefore, it is possible to estimate an accurate position compared to the existing method while lowering the complexity of the overall system. And through the simulation, it was confirmed that even in a situation where distortion occurs, the position is estimated with a lower error compared to other algorithms.

In addition, it can be seen that the position of the receiver can be estimated as a result of applying the proposed method in a simulation in which an actual beamforming pattern of a 5.6GHz 8 x 8 antenna is applied by different beam patterns. That is, the proposed scheme can be easily applied even when the number of antennas or beam patterns according to frequencies are different.

5 is a diagram for describing a method of estimating a location according to an embodiment.

In other words, FIG. 5 is a diagram illustrating a location estimation method using a location estimation apparatus according to an embodiment described with reference to FIGS. 1 to 4D, and a location estimation apparatus according to an embodiment of the contents described later with reference to FIG. 5. Descriptions that are overlapping with those described through will be omitted.

Referring to FIG. 5, in step 510, in the method for estimating a position according to an embodiment, a receiver may receive information on a plurality of beams radiated at different radiation angles from a transmitter.

According to one side, the information on the plurality of beams may include a size of a radiation angle of each of the plurality of beams and a received power value of a receiver corresponding to each of the plurality of beams.

Next, in step 520, in the method for estimating a position according to an embodiment, the radiation pattern reader may read radiation pattern information corresponding to each of the plurality of beams based on information on the plurality of beams.

Next, in step 530, the position estimation method according to an embodiment may compare each of the radiation pattern information read by the position estimation unit with each other, and estimate the position of the receiver based on the comparison result.

According to one side, in step 530, the position estimation method according to an embodiment calculates a decibel (dB) value of an antenna gain corresponding to each of the read radiation pattern information, and calculates a decibel (dB) value of the calculated antenna gain. By subtracting, an angle corresponding to a result value having a preset value among the total result values according to the subtraction result may be calculated, and an angle corresponding to the calculated result value may be estimated as an angle between the transmitter and the receiver.

According to one side, in step 530, the position estimation method according to an embodiment may calculate two beams having the largest received power values among a plurality of beams, and calculate radiation pattern information corresponding to each of the calculated two beams. .

Consequently, using the present invention, the position of the receiver can be estimated by comparing radiation pattern information corresponding to a plurality of beams radiated from the transmitter at different random radiation angles.

In addition, it is possible to more accurately estimate the position of the receiver with only two beams radiated from the transmitter at different random radiation angles.

In addition, by estimating the position of the receiver in all directions based on the position of the transmitter by transmitting only two beams and comparing received values for them, the complexity of position estimation can be reduced and the position can be estimated more quickly.

As described above, although the embodiments have been described by the limited drawings, various modifications and variations are possible from the above description to those of ordinary skill in the art. For example, the described techniques are performed in a different order from the described method, and/or components such as a system, structure, device, circuit, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and claims and equivalents fall within the scope of the claims to be described later.

100: position estimation device 110: receiver
120: radiation pattern reading unit 130: position estimation unit

Claims (12)

A receiver configured to receive information on a plurality of beams radiated at different radiation angles from the transmitter;
A radiation pattern reading unit that reads radiation pattern information corresponding to each of the plurality of beams, based on the information on the plurality of beams, and
A position estimation unit that compares each of the read radiation pattern information with each other and estimates the position of the receiver based on the comparison result
Position estimation device comprising a. The method of claim 1,
Information on the plurality of beams,
Including the magnitude of the radiation angle of each of the plurality of beams and a received power value of the receiver corresponding to each of the plurality of beams
Position estimation device. The method of claim 1,
The radiation pattern reading unit,
Radiation pattern information corresponding to each of the m (where m is a positive integer) beams radiated from the transmitter at different radiation angles is stored in advance, and the plurality of beams are stored in advance. To read the radiation pattern information corresponding to the information
Position estimation device. The method of claim 1,
The position estimation unit,
An antenna gain corresponding to each of the read radiation pattern information is calculated, each decibel (dB) value of the calculated antenna gain is subtracted from each other, and a result value having a preset value among the total result values according to the subtraction result Calculating a corresponding angle, and estimating an angle corresponding to the calculated result value as an angle between the transmitter and the receiver
Position estimation device. The method of claim 4,
The position estimation unit,
When a plurality of result values having the preset value according to subtraction of each of the decibel (dB) values of antenna gains corresponding to the first beam and the second beam are calculated, the first beam and the first beam among the plurality of calculated result values One value corresponding to the subtraction result of each of the decibel (dB) value of the antenna gain of the second beam and the decibel (dB) value of the antenna gain of the third beam is calculated, and the calculated value is Estimating the angle as the angle between the transmitter and the receiver
Position estimation device. The method of claim 2,
The position estimation unit,
The received power value corresponding to the first beam and the decibel value of the antenna gain corresponding to the second beam are reflected to the received power value corresponding to the second beam and the decibel value of the antenna gain corresponding to the first beam is reflected. Estimating the angle between the transmitter and the receiver based on the value at which the result of subtracting the value becomes the minimum
Position estimation device. The method of claim 2,
The radiation pattern reading unit,
Calculating two beams having the largest received power value among the plurality of beams, and reading radiation pattern information corresponding to each of the calculated two beams
Position estimation device. The method of claim 7,
The position estimation unit,
The calculated radiation angle of each of the two beams is

And

(here,

<

),

To

(here,

Is to estimate the position of the receiver within the radiation angle range of the calculated distance between the two beams)
Position estimation device. Receiving, by a receiver, information on a plurality of beams radiated at different radiation angles from a transmitter;
In a radiation pattern reading unit, reading radiation pattern information corresponding to each of the plurality of beams, based on information on the plurality of beams, and
Comparing each of the read radiation pattern information with each other, and estimating a position of the receiver based on the comparison result, in a position estimating unit
Position estimation method comprising a. The method of claim 9,
Information on the plurality of beams,
Including the magnitude of the radiation angle of each of the plurality of beams and a received power value of the receiver corresponding to each of the plurality of beams
Location estimation method. The method of claim 9,
The step of estimating the location of the receiver,
An antenna gain corresponding to each of the read radiation pattern information is calculated, each decibel (dB) value of the calculated antenna gain is subtracted from each other, and a result value having a preset value among the total result values according to the subtraction result Calculating a corresponding angle, and estimating an angle corresponding to the calculated result value as an angle between the transmitter and the receiver
Location estimation method. The method of claim 10,
The step of reading the radiation pattern information,
Calculating two beams having the largest received power value among the plurality of beams, and reading radiation pattern information corresponding to each of the calculated two beams
Location estimation method.

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