CN101406017B - 用于在正交频分复用系统中估计并补偿载波频率偏移的方法和设备 - Google Patents
用于在正交频分复用系统中估计并补偿载波频率偏移的方法和设备 Download PDFInfo
- Publication number
- CN101406017B CN101406017B CN2007800098258A CN200780009825A CN101406017B CN 101406017 B CN101406017 B CN 101406017B CN 2007800098258 A CN2007800098258 A CN 2007800098258A CN 200780009825 A CN200780009825 A CN 200780009825A CN 101406017 B CN101406017 B CN 101406017B
- Authority
- CN
- China
- Prior art keywords
- signal
- carrier frequency
- frequency offset
- receives
- initial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000002596 correlated effect Effects 0.000 claims abstract description 4
- 230000009466 transformation Effects 0.000 claims description 12
- 125000004122 cyclic group Chemical group 0.000 claims description 9
- 238000010606 normalization Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 abstract description 16
- 230000003111 delayed effect Effects 0.000 abstract 1
- 239000000523 sample Substances 0.000 description 33
- 230000000875 corresponding effect Effects 0.000 description 14
- 238000004364 calculation method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- 238000007792 addition Methods 0.000 description 8
- 230000008685 targeting Effects 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 230000001360 synchronised effect Effects 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000012050 conventional carrier Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000012549 training Methods 0.000 description 2
- 229920000535 Tan II Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2676—Blind, i.e. without using known symbols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/10—Arrangements for initial synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
Description
Claims (12)
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/394,269 | 2006-03-29 | ||
US11/394,269 US7649963B2 (en) | 2006-03-29 | 2006-03-29 | Apparatus for estimating and compensating carrier frequency offset and data receiving method in receiver of wireless communication system |
KR1020060139049 | 2006-12-29 | ||
KR1020060139049A KR100865938B1 (ko) | 2006-03-29 | 2006-12-29 | 무선 통신 시스템의 수신기에서 캐리어 주파수 옵셋 추정및 보상을 위한 장치 및 데이터 수신 방법 |
KR10-2006-0139049 | 2006-12-29 | ||
PCT/KR2007/001332 WO2007111431A1 (en) | 2006-03-29 | 2007-03-19 | Apparatus for estimating and compensating carrier frequency offset and data receiving method in receiver of wireless communication system |
Publications (2)
Publication Number | Publication Date |
---|---|
CN101406017A CN101406017A (zh) | 2009-04-08 |
CN101406017B true CN101406017B (zh) | 2012-05-23 |
Family
ID=38558882
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN2007800098258A Active CN101406017B (zh) | 2006-03-29 | 2007-03-19 | 用于在正交频分复用系统中估计并补偿载波频率偏移的方法和设备 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7649963B2 (zh) |
EP (1) | EP2008417A1 (zh) |
KR (1) | KR100865938B1 (zh) |
CN (1) | CN101406017B (zh) |
WO (1) | WO2007111431A1 (zh) |
Families Citing this family (42)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100729726B1 (ko) * | 2005-09-14 | 2007-06-18 | 한국전자통신연구원 | 직교 주파수 분할 다중화 방식의 통신 시스템의 타이밍획득 및 반송파 주파수 오차 추정 장치 및 방법 |
US7746963B2 (en) * | 2006-01-06 | 2010-06-29 | Qualcomm Incorporated | Methods and apparatus for frequency tracking of a received signal |
KR100765818B1 (ko) * | 2006-05-08 | 2007-10-10 | 주식회사 이노와이어리스 | 휴대인터넷 시스템의 신호품질 계측장치 및 방법 |
JP4946159B2 (ja) * | 2006-05-09 | 2012-06-06 | 富士通株式会社 | 無線送信方法及び無線受信方法並びに無線送信装置及び無線受信装置 |
US20080118016A1 (en) * | 2006-11-20 | 2008-05-22 | Yu-Min Chuang | Synchronous circuit of receiving device of wireless transmission system |
US20090022083A1 (en) * | 2007-07-16 | 2009-01-22 | Electronics And Telecommunications Research Institute | Method of synchronizing frame in mmr network |
CN101897146B (zh) * | 2007-12-14 | 2014-01-29 | 爱立信电话股份有限公司 | 用于通过无线电信道来通信的方法和装置 |
KR100946079B1 (ko) | 2007-12-28 | 2010-03-10 | 삼성전기주식회사 | 타이밍 오프셋 회복 기능을 갖는 무선 수신 장치 및 이를이용한 타이밍 오프셋 회복 방법 |
WO2009084923A2 (en) * | 2008-01-03 | 2009-07-09 | Lg Electronics Inc. | Method for transmitting preamble in scalable bandwidth system |
CN101217790B (zh) * | 2008-01-10 | 2012-06-06 | 中兴通讯股份有限公司 | 用于无线通信系统的随机接入信道构造方法和装置 |
US8125885B2 (en) * | 2008-07-11 | 2012-02-28 | Texas Instruments Incorporated | Frequency offset estimation in orthogonal frequency division multiple access wireless networks |
KR101239865B1 (ko) * | 2008-11-04 | 2013-03-06 | 차이나 아카데미 오브 텔레커뮤니케이션즈 테크놀로지 | 다중 반송파의 집적 전송을 실현하는 방법 및 장치 |
CN101741798B (zh) * | 2008-11-04 | 2013-04-10 | 电信科学技术研究院 | 一种实现多载波聚合传输的方法和装置 |
CN101924723B (zh) | 2009-06-09 | 2013-05-08 | 中兴通讯股份有限公司 | Ofdm信号解调方法和装置 |
DE102009030318B4 (de) * | 2009-06-24 | 2012-09-06 | Opticom Dipl.-Ing. Michael Keyhl Gmbh | Vorrichtung und Verfahren zur Bestimmung eines Abtastratenunterschiedes |
KR101298591B1 (ko) * | 2009-12-17 | 2013-08-26 | 한국전자통신연구원 | 무선 통신 시스템에서 데이터 송수신 장치 및 방법 |
WO2011127621A1 (en) * | 2010-04-12 | 2011-10-20 | Telefonaktiebolaget L M Ericsson (Publ) | Determination of frequency offset |
US9036999B2 (en) * | 2010-07-31 | 2015-05-19 | Alcatel Lucent | Frame/symbol synchronization in coherent optical OFDM |
WO2011144076A2 (zh) * | 2011-05-25 | 2011-11-24 | 华为技术有限公司 | 上行随机接入信号的处理方法及装置 |
KR101240895B1 (ko) * | 2011-10-31 | 2013-03-11 | 전자부품연구원 | 일 대 n 무선 데이터 통신 시스템의 패킷 동기화 장치 |
EP2639982B1 (en) * | 2012-03-15 | 2015-01-14 | ST-Ericsson SA | A receiver and a method therein |
US9419830B2 (en) * | 2012-03-28 | 2016-08-16 | Intel Corporation | Device, system and method of communicating a wireless communication orthogonal-frequency-division-multiplexing signal |
US9301269B1 (en) * | 2012-09-18 | 2016-03-29 | Marvell International Ltd. | Acquisition of periodic synchronization signals |
US9484969B2 (en) * | 2012-10-12 | 2016-11-01 | Innoventure L.P. | Delta-pi signal acquisition |
US9768925B2 (en) | 2012-11-04 | 2017-09-19 | Lg Electronics Inc. | Method for transmitting/receiving synchronizing signals in wireless communication system and device therefor |
KR101447782B1 (ko) * | 2012-11-13 | 2014-10-16 | 중앙대학교 산학협력단 | 무선 메쉬 네트워크에서 분산 주파수 동기화 방법 및 장치 |
CN104283819B (zh) * | 2013-07-01 | 2018-07-03 | 华为技术有限公司 | 信道估计处理方法、装置和通信设备 |
JP6115416B2 (ja) * | 2013-09-06 | 2017-04-19 | 富士通株式会社 | 光送信器、光受信器、光伝送システム、光送信方法、光受信方法、および光伝送方法 |
KR101467252B1 (ko) * | 2013-11-19 | 2014-12-01 | 성균관대학교산학협력단 | 낮은 복잡도의 ofdm 정수 주파수 옵셋 추정 방법, 이를 이용한 ofdm 정수 주파수 옵셋 추정 장치 및 ofdm 수신기 시스템 |
KR101626457B1 (ko) * | 2013-12-20 | 2016-06-01 | 주식회사 쏠리드 | Lte 프레임 동기 검출 방법 및 장치, 이를 적용한 중계 장치 |
CN105450564B (zh) * | 2014-07-28 | 2019-03-29 | 联想(北京)有限公司 | 信号处理方法及电子设备 |
US10129014B2 (en) * | 2017-01-25 | 2018-11-13 | Samsung Electronics Co., Ltd. | System and method of performing initial timing synchronization of receivers of modulated signals |
TWI627836B (zh) * | 2017-02-24 | 2018-06-21 | 晨星半導體股份有限公司 | 載波頻率偏移追蹤電路及方法 |
EP3425864A1 (en) * | 2017-07-06 | 2019-01-09 | Intel IP Corporation | Communication device and method for estimating a frequency offset |
CN108777670B (zh) * | 2018-05-31 | 2020-11-10 | 清华大学 | 一种帧同步方法及装置 |
FR3085568B1 (fr) * | 2018-08-31 | 2020-08-07 | Zodiac Data Systems | Procede de datation de signaux de telemesure |
CN110912849B (zh) * | 2019-11-21 | 2020-12-18 | 华中科技大学 | 一种基于循环前缀的多载波方法及系统 |
CN112073348B (zh) * | 2020-09-07 | 2022-05-17 | 北京航宇星通科技有限公司 | 频偏补偿方法及系统 |
US11770287B2 (en) | 2020-12-30 | 2023-09-26 | Silicon Laboratories Inc. | Apparatus for receiver with carrier frequency offset correction using phase and frequency information and associated methods |
US11784671B2 (en) * | 2020-12-30 | 2023-10-10 | Silicon Laboratories Inc. | Apparatus for receiver with carrier frequency offset correction using frequency information and associated methods |
CN114301746B (zh) * | 2021-12-27 | 2024-05-03 | 航天恒星科技有限公司 | 载波频偏估计方法及装置 |
CN115549724B (zh) * | 2022-09-22 | 2024-06-14 | 深圳市力合微电子股份有限公司 | 用于直接序列扩频信号的码片同步和频率估计方法和系统 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000070802A1 (fr) * | 1999-05-18 | 2000-11-23 | Sharp Kabushiki Kaisha | Recepteur de signaux et procede de compensation du decalage de frequence |
WO2003001760A1 (en) * | 2001-06-22 | 2003-01-03 | Thomson Licensing S.A. | Method and system for compensation of a carrier frequency offset in an ofdm receiver |
WO2003071758A1 (en) * | 2002-02-21 | 2003-08-28 | Freescale Semiconductor, Inc. | I/q mismatch compensation in an ofdm receiver in presence of frequency offset |
WO2003039025A3 (en) * | 2001-10-17 | 2004-05-27 | Nokia Corp | A receiver including a frequency offset compensator |
US6956895B2 (en) * | 2000-05-30 | 2005-10-18 | Nokia Mobile Phones Ltd. | Method and arrangement for reducing frequency offset in a radio receiver |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR960006376A (ko) * | 1994-07-30 | 1996-02-23 | 배순훈 | 다중 캐리어 통신에서의 채널 부호화 방법 |
JP4982186B2 (ja) * | 2004-12-21 | 2012-07-25 | パナソニック株式会社 | Ofdm受信装置 |
US8009775B2 (en) * | 2005-03-11 | 2011-08-30 | Qualcomm Incorporated | Automatic frequency control for a wireless communication system with multiple subcarriers |
-
2006
- 2006-03-29 US US11/394,269 patent/US7649963B2/en active Active
- 2006-12-29 KR KR1020060139049A patent/KR100865938B1/ko active IP Right Grant
-
2007
- 2007-03-19 CN CN2007800098258A patent/CN101406017B/zh active Active
- 2007-03-19 EP EP07715710A patent/EP2008417A1/en not_active Withdrawn
- 2007-03-19 WO PCT/KR2007/001332 patent/WO2007111431A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000070802A1 (fr) * | 1999-05-18 | 2000-11-23 | Sharp Kabushiki Kaisha | Recepteur de signaux et procede de compensation du decalage de frequence |
US6956895B2 (en) * | 2000-05-30 | 2005-10-18 | Nokia Mobile Phones Ltd. | Method and arrangement for reducing frequency offset in a radio receiver |
WO2003001760A1 (en) * | 2001-06-22 | 2003-01-03 | Thomson Licensing S.A. | Method and system for compensation of a carrier frequency offset in an ofdm receiver |
WO2003039025A3 (en) * | 2001-10-17 | 2004-05-27 | Nokia Corp | A receiver including a frequency offset compensator |
WO2003071758A1 (en) * | 2002-02-21 | 2003-08-28 | Freescale Semiconductor, Inc. | I/q mismatch compensation in an ofdm receiver in presence of frequency offset |
Also Published As
Publication number | Publication date |
---|---|
KR20070098462A (ko) | 2007-10-05 |
US7649963B2 (en) | 2010-01-19 |
CN101406017A (zh) | 2009-04-08 |
US20070230591A1 (en) | 2007-10-04 |
KR100865938B1 (ko) | 2008-10-29 |
WO2007111431A1 (en) | 2007-10-04 |
EP2008417A1 (en) | 2008-12-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101406017B (zh) | 用于在正交频分复用系统中估计并补偿载波频率偏移的方法和设备 | |
US7039000B2 (en) | Timing synchronization for OFDM-based wireless networks | |
CN100448184C (zh) | 正交频分多路复用系统的接收机 | |
CN101075829B (zh) | 一种适用于正交频分复用系统的信道估计方法 | |
US7949034B2 (en) | Apparatus and method for estimating uplink frequency offset in wireless communication system | |
US8134911B2 (en) | OFDM-based device and method for performing synchronization in the presence of interference signals | |
US8355468B2 (en) | Carrier frequency estimation method and apparatus in wireless communication system | |
KR20050092063A (ko) | 직교 분할 다중 접속 시스템에서 파일럿 신호 생성 방법및 장치 | |
US20080273646A1 (en) | Sampling clock offset tracking and symbol re-timing | |
JP2013251902A (ja) | 受信機を同期させるデバイス及び方法並びにコンピュータープログラム | |
KR20060003670A (ko) | 프레임 및 심볼 시간동기 검출장치 및 검출방법 | |
CN102075475B (zh) | 定时偏差和采样频偏的联合跟踪方法 | |
JP3544147B2 (ja) | Ofdm信号受信装置、ofdm信号通信システム及びその通信制御方法 | |
KR20100054987A (ko) | Ofdm 시스템에서의 주파수 추정을 위한 장치 및 방법 | |
JP3558879B2 (ja) | ディジタル通信装置 | |
KR101042737B1 (ko) | 오에프디엠 시스템에서 파일럿 상관값 기반 시간 옵셋에 강인한 정수 주파수 옵셋 추정 방법 및 장치 | |
Nasraoui et al. | Robust brute force and reduced complexity approaches for timing synchronization in IEEE 802.11 a/g WLANs | |
JP3495962B2 (ja) | 歪み推定装置 | |
KR100873876B1 (ko) | 직교 주파수 분할 다중 신호 수신 방법 및 이를 이용한직교 주파수 분할 다중 신호 수신 장치 | |
KR100313860B1 (ko) | Ofdm 전송 방식에서 미세 주파수 복원장치 및 그 방법 | |
CN116545825B (zh) | 应用ofdm系统的多普勒频偏估计方法及系统、装置 | |
You et al. | Multiplication-free estimation of integer frequency offset for OFDM-based DRM systems | |
JP2003264527A (ja) | Ofdm用周波数誤差検出装置、検出方法、および、ofdm用受信装置 | |
KR20120059243A (ko) | 직교 부호화 주파수 분할 다중 방식 통신 시스템에서 간소화된 주파수 오프셋 추정 방법 및 수신기 | |
KR101000791B1 (ko) | Drm 수신기의 프레임 동기화 장치, 그 방법 및 시스템 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
ASS | Succession or assignment of patent right |
Owner name: HILL NETWORKS, INC. Free format text: FORMER OWNER: POSDATA CO., LTD. Effective date: 20101221 |
|
C41 | Transfer of patent application or patent right or utility model | ||
COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: GYEONGSANGBUK-DO, SOUTH KOREA TO: SEOUL, SOUTH KOREA |
|
TA01 | Transfer of patent application right |
Effective date of registration: 20101221 Address after: Seoul, Korea Applicant after: Seah Networks Co. Lt Address before: Gyeongbuk, South Korea Applicant before: Pohang love Matisse Corporation |
|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
ASS | Succession or assignment of patent right |
Owner name: YINGDI CO., LTD. Free format text: FORMER OWNER: HILL NETWORKS, INC. Effective date: 20130605 |
|
C41 | Transfer of patent application or patent right or utility model | ||
TR01 | Transfer of patent right |
Effective date of registration: 20130605 Address after: Seoul, Korea Patentee after: Neo Lab Convergence Inc. Address before: Seoul, Korea Patentee before: Seah Networks Co. Lt |
|
TR01 | Transfer of patent right |
Effective date of registration: 20210701 Address after: Texas USA Patentee after: Wireless Alliance Ltd. Address before: Seoul, Korea Patentee before: Indy Co.,Ltd. |
|
TR01 | Transfer of patent right |