# US 11,909,695 B2 · Repeater and method of operation thereof

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- Number: US 11,909,695 B2
- Document ID: US11909695B2
- Status: Granted
- Kind: B2
- Application number: 17/634,765
- Filed: 2020-08-13
- Published: 2022-09-01
- Granted: 2024-02-20
- Earliest claimed: 2019-08-13
- Assignees: SOLiD, INC.; Hunergy Co., Ltd.
- Applicants: SOLiD, INC.; Hunergy Co., Ltd.
- Inventors: Nagwon Kwon; Jongkuan Lee
- Web page: https://patentgrep.com/patent/US11909695B2

## CPC

- H04L 5/1461: {Suppression of signals in the return path, i.e. bidirectional control circuits}
- H04L 5/1469: {using time-sharing}
- H04B 7/15528: {Control of operation parameters of a relay station to exploit the physical medium}
- H04B 7/15585: {by interference cancellation}
- H04L 27/367: {using predistortion}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

Provided is a method of operating a repeater operating in a time division duplex (TDD) mode which comprises detecting a synchronization signal from a received signal, determining a type of a communication period based on the detected synchronization signal and controlling an operation of a signal linearizer based on the determined type of the communication period.

## Claims

### Claim 1

A method of operating a repeater operating in a time division duplex (TDD) mode, the method comprising:
detecting a synchronization signal from a received signal;
determining whether a type of a communication period is a downlink communication period based on the detected synchronization signal;
based on the type of the communication period being the downlink communication period, activating a certain operation of a signal linearizer; and
based on the type of the communication period being not the downlink communication period, deactivating the certain operation of the signal linearizer.

### Claim 2 (depends on 1)

The method of claim 1, wherein the certain operation of the signal linearizer is an operation of performing digital pre-distortion (DPD) on the received signal.

### Claim 3 (depends on 2)

The method of claim 2, wherein the activating of the certain operation of the signal linearizer comprises:
stopping a coefficient calculation operation o a coefficient update operation for performing the DPD on the signal linearizer when the type of the communication period is not the downlink communication period.

### Claim 4 (depends on 1)

The method of claim 1, wherein the certain operation of the signal linearizer is an operation of performing adaptive pre-distortion (APD) on the received signal.

### Claim 5 (depends on 4)

The method of claim 4, wherein the activating of the certain operation of the signal linearizer comprises:
stopping a coefficient calculation operation or a coefficient update operation for performing the APD on the signal linearizer when the type of the communication period is not the downlink communication period.

### Claim 6 (depends on 5)

The method of claim 5, further comprising:
setting a coefficient using initially set coefficient values when a changed value in the magnitude of power of the received signal during a unit time exceeds a reference value.

### Claim 7 (depends on 6)

The repeater of claim 6, wherein the initially set coefficient values are stored in the form of a lookup table.

### Claim 8

A repeater operating in a time division duplex (TDD) mode, the repeater comprising:
a synchronous detector configured to detect a synchronization signal from a received signal;
a controller configured to determine whether a type of a communication period is a downlink communication period based on the detected synchronization signal and to generate a control signal based on whether the determined type of the communication period is the downlink communication period; and
a signal linearizer configured to control a linearization operation of the received signal based on the generated control signal,
wherein a certain operation of the signal linearizer activated based on the type of the communication period being the downlink communication period, and the certain operation of the signal linearizer deactivated in case that the type of the communication period is not the downlink communication period.

### Claim 9 (depends on 8)

The repeater of claim 8, wherein the signal linearizer performs digital pre-distortion (DPD) on the received signal.

### Claim 10 (depends on 8)

The repeater of claim 8, wherein the signal linearizer performs adaptive pre-distortion (APD) on the received signal.