H04L 27/2657
Carrier synchronisation
Official title: {Carrier synchronisation}
H04L27/2657 (Carrier synchronisation) appears on 2,253 US grants and 2,246 published applications in this corpus.
Search patents in H04L- Granted patents
- 2,253
- Published applications
- 2,246
- Assignees
- 629
- Inventors
- 3,648
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 4 | 0 |
| 1994 | 5 | 0 |
| 1995 | 3 | 0 |
| 1996 | 7 | 0 |
| 1997 | 8 | 0 |
| 1998 | 15 | 0 |
| 1999 | 18 | 0 |
| 2000 | 24 | 0 |
| 2001 | 27 | 8 |
| 2002 | 33 | 44 |
| 2003 | 35 | 44 |
| 2004 | 24 | 72 |
| 2005 | 28 | 71 |
| 2006 | 50 | 82 |
| 2007 | 64 | 148 |
| 2008 | 77 | 152 |
| 2009 | 86 | 133 |
| 2010 | 123 | 97 |
| 2011 | 117 | 106 |
| 2012 | 132 | 83 |
| 2013 | 133 | 94 |
| 2014 | 120 | 83 |
| 2015 | 125 | 91 |
| 2016 | 81 | 68 |
| 2017 | 99 | 100 |
| 2018 | 88 | 100 |
| 2019 | 121 | 134 |
| 2020 | 127 | 131 |
| 2021 | 124 | 86 |
| 2022 | 83 | 102 |
| 2023 | 96 | 74 |
| 2024 | 77 | 64 |
| 2025 | 58 | 48 |
| 2026 | 34 | 31 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- OFDM communications system with method for determination of subcarrier offset for OFDM symbol generation15 Sep 2026US 12,739,159 B2Huawei Technologies Co., Ltd.
- Device-controlled adaptive delay diversity15 Sep 2026US 12,739,765 B2Motorola Mobility LLC
- Transmission apparatus, reception apparatus, transmission method, and reception method1 Sep 2026US 12,726,386 B2Panasonic Intellectual Property Corporation of America
- Method and apparatus for performing channel estimation for uplink data in NB-IoT physical layer18 Aug 2026US 12,712,764 B2Rakuten Symphony, Inc.
- Asynchronous non-orthogonal multiple access for ambient internet of things (AIoT) devices18 Aug 2026US 12,712,776 B2Lenovo (United States) Inc.
- Band gap mitigation during component carrier sensing8 Oct 2026US 2026/0312857 A1Intel Corporation
- Loopback signal, receiver and transmitter for synchronization10 Sep 2026US 2026/0270133 A1Hughes Network Systems, LLC
- Synchronizing carrier frequency of multiple access points27 Aug 2026US 2026/0254700 A1Samsung Electronics Co., Ltd.
- Communication method and communication apparatus20 Aug 2026US 2026/0247487 A1Huawei Technologies Co., Ltd.
- Electronic device for outputting wireless signal based on chirp signal by modifying frequency of frequency synthesizing circuit and method thereof6 Aug 2026US 2026/0230365 A1Samsung Electronics Co., Ltd.
Most cited
By later US patents
- Timing and frequency synchronization of OFDM signals425US 5,732,113 AStanford University · 1998
- Transport of payload information and control messages on multiple orthogonal carriers spread throughout substantially all of a frequency bandwith320US 6,275,990 B1ADC Telecommunications, Inc. · 2001
- System and method for distributed input distributed output wireless communications272US 7,599,420 B2Rearden, LLC · 2009
- OFDM transmission/reception system and transmitting/receiving apparatus269US 5,694,389 AKabushiki Kaisha Toshiba · 1997
- Channel selection for a hybrid fiber coax network264US 6,334,219 B1ADC Telecommunications, Inc. · 2001