# US 12,003,357 B2 · Receiver

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- Number: US 12,003,357 B2
- Document ID: US12003357B2
- Status: Granted
- Kind: B2
- Application number: 17/816,480
- Filed: 2022-08-01
- Published: 2022-11-17
- Granted: 2024-06-04
- Earliest claimed: 2020-02-13
- Assignees: Alps Alpine Co., Ltd.
- Applicants: Alps Alpine Co., Ltd.
- Inventors: Yukimitsu Yamada; Daisuke Takai; Mitsunobu Inoue
- Web page: https://patentgrep.com/patent/US12003357B2

## CPC

- H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)}
- G01S 3/48: the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured
- G01S 5/04: Position of source determined by a plurality of spaced direction-finders
- H04L 27/364: {Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

In order to provide a receiver capable of accurately determining a phase difference of I/Q signals, a receiver includes a section detector configured to detect a section between a rising and a falling of a phase based on the rising and the falling of the phase represented by I/Q signals generated based on an advertisement packet transmitted from a transmitter, and a section setting unit configured to identify, within the section between the rising and the falling of the phase, a period in which a first variation amount of the phase is equal to or less than a first predetermined amount, and use the identified period as a section for detecting the phase of the I/Q signals. The section detector detects the rising when a first phase is smaller than a last phase among a plurality of phases acquired by sampling the phases.

## Claims

### Claim 1

A receiver comprising:
a section detector configured to detect a section between a rising and a falling of a phase based on the rising and the falling of the phase represented by I/Q signals generated based on an advertisement packet transmitted from a transmitter; and
a section setting unit configured to identify, within the section between the rising and the falling of the phase, a period in which a first variation amount of the phase is equal to or less than a first predetermined amount, and use the identified period as a section for detecting the phase of the I/Q signals,
wherein the section detector detects the rising when a first phase is smaller than a last phase among a plurality of phases acquired by sampling the phases.

### Claim 2 (depends on 1)

The receiver according to claim 1, wherein the section detector detects a section after the rising or a section before the falling as the section between the rising and the falling.

### Claim 3 (depends on 2)

The receiver according to claim 2, wherein the section detector detects the section between the rising and the falling located after the rising when a second variation of a plurality of phases acquired from phases at sampling points shifted later in a time axis direction is equal to or less than a second predetermined amount and is after the rising is detected.

### Claim 4 (depends on 1)

The receiver according to claim 1, wherein the section detector detects the falling when the first phase among the plurality of phases acquired by sampling the phases is greater than the last phase.

### Claim 5 (depends on 4)

The receiver according to claim 4, wherein the section detector detects the section between the rising and the falling located after the falling, when a second variation of the plurality of phases acquired from the phases at sampling points shifted later in a time axis direction is equal to or less than a second predetermined amount and is after the falling is detected.

### Claim 6 (depends on 4)

The receiver according to claim 4, wherein the section detector detects the section between the rising and the falling located after the falling when a second variation of the plurality of phases acquired from the phase at a sampling point shifted backward in a time axis direction is equal to or less than a second predetermined amount and is not after the falling is detected.

### Claim 7 (depends on 3)

The receiver according to claim 3, wherein the second variation amount is a variance value of the plurality of phases or a difference between a maximum value and a minimum value of the plurality of phases.

### Claim 8 (depends on 1)

The receiver according to claim 1, wherein the section setting unit, before and after from a center between a start point of the rising and an end point of the falling in a time axis direction, identifies a period in which the first variation amount of the I/Q signals is equal to or less than a predetermined amount, and uses the identified period as the section for detecting the phase, or, before and after from a center between an end point of the rising and a start point of the falling in the time axis direction, identifies a period in which the first variation amount of the I/Q signals is equal to or less than a predetermined amount, and uses the identified period as the section for detecting the phase.

### Claim 9 (depends on 8)

The receiver according to claim 8, wherein the first variation amount is a variance value of the phase before and after from the center between the start point of the rising and the end point of the falling in the time axis direction, or a difference between a maximum value and a minimum value of the I/Q signals before and after from the center between the start point of the rising and the end point of the falling in the time axis direction.

### Claim 10 (depends on 9)

The receiver according to claim 9, wherein the rising and the falling are generated by switching a plurality of antennas for receiving the advertisement packet, and a Direction-of-Arrival of a radio wave is measured based on the phase difference of the I/Q signals.

### Claim 11 (depends on 8)

The receiver according to claim 8, wherein the section in which the first variation amount of the I/Q signals is equal to or less than the predetermined amount is a section in which the variation value of the phase is a minimum or a section in which the variation value of the phase is equal to or less than a predetermined value.

### Claim 12

A receiver comprising:
a marker applying unit configured to apply a marker to I/Q signals generated based on an advertisement packet transmitted from a transmitter;
a detector configured to detect the marker and a section between a rising and a falling of the I/Q signals; and
a section setting unit configured to adjust a section for detecting a phase in a phase direction such that the section for detecting the phase represented by the I/Q signals is included in the section between the rising and the falling based on a detection result of the detector.

### Claim 13 (depends on 12)

The receiver according to claim 12, wherein the rising and the falling are generated by switching a plurality of antennas for receiving the advertisement packet, and a Direction-of-Arrival of a radio wave is measured based on the phase difference of the I/Q signals.

### Claim 14 (depends on 13)

The receiver according to claim 13, wherein the marker applying unit assigns the marker when switching the plurality of antennas.

### Claim 15 (depends on 12)

The receiver according to claim 12, further comprising a section detector configured to detect a section between a rising and a falling of a phase based on the rising and the falling of the phase represented by I/Q signals generated based on an advertisement packet transmitted from a transmitter,
wherein the section detector detects the section between the rising and the falling located after the rising when a second variation of the plurality of phases acquired from phases at sampling points shifted later in a time axis direction is equal to or less than a second predetermined amount and is after the rising is detected.

### Claim 16 (depends on 15)

The receiver according to claim 15, wherein the section detector detects the falling when the first phase of the plurality of phases acquired by sampling the phases is greater than the last phase.

### Claim 17 (depends on 16)

The receiver according to claim 16, wherein the section detector detects the section between the rising and the falling located after the falling when a second variation of the plurality of phases acquired from phases at sampling points shifted later in a time axis direction is equal to or less than a second predetermined amount and is after the falling is detected.

### Claim 18 (depends on 16)

The receiver according to claim 16, wherein the section detector detects the section between the rising and the falling located after the falling when a second variation of the plurality of phases acquired from the phases at sampling points shifted later in a time axis direction is equal to or less than a second predetermined amount and is not after the falling is detected.

### Claim 19 (depends on 15)

The receiver according to claim 15, wherein the second variation amount is a variance value of the plurality of phases or a difference between a maximum value and a minimum value of the plurality of phases.