H04L 27/2681
Characterised by constraints
Official title: {characterised by constraints}
H04L27/2681 (Characterised by constraints) appears on 316 US grants and 347 published applications in this corpus.
Search patents in H04L- Granted patents
- 316
- Published applications
- 347
- Assignees
- 174
- Inventors
- 820
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 2 |
| 2003 | 1 | 2 |
| 2004 | 1 | 1 |
| 2005 | 1 | 2 |
| 2006 | 1 | 11 |
| 2007 | 4 | 14 |
| 2008 | 1 | 15 |
| 2009 | 8 | 19 |
| 2010 | 11 | 24 |
| 2011 | 13 | 25 |
| 2012 | 28 | 16 |
| 2013 | 31 | 28 |
| 2014 | 25 | 18 |
| 2015 | 32 | 19 |
| 2016 | 19 | 15 |
| 2017 | 16 | 15 |
| 2018 | 13 | 19 |
| 2019 | 21 | 19 |
| 2020 | 16 | 11 |
| 2021 | 10 | 17 |
| 2022 | 17 | 15 |
| 2023 | 16 | 11 |
| 2024 | 12 | 8 |
| 2025 | 9 | 13 |
| 2026 | 4 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method and apparatus for detecting preamble signal of random access channel in base station of wireless communication system12 May 2026US 12,627,547 B2Samsung Electronics Co., Ltd.
- Techniques for tone reservation in orthogonal time-frequency space waveform communications3 Mar 2026US 12,568,012 B2QUALCOMM Incorporated
- Transmitter and receiver for, and method of, transmitting and receiving symbols over time varying channels with doppler spread24 Feb 2026US 12,562,949 B2Continental Automotive Technologies GmbH
- Transmitter and receiver for, and method of, transmitting and receiving symbols over time varying channels with Doppler spread20 Jan 2026US 12,531,771 B2Continental Automotive Technologies GmbH
- Physical (PHY) layer communications16 Dec 2025US 12,500,706 B2QUALCOMM Incorporated
- Cyclic Shift Method for Root Sequence and Apparatus6 Aug 2026US 2026/0230358 A1Huawei Technologies Co., Ltd.
- Modulation classification and demodulation system with a neural network16 Jul 2026US 2026/0205331 A1University of Dayton
- Physical (phy) layer communications19 Mar 2026US 2026/0081729 A1QUALCOMM Incorporated
- Signal measurement and reporting method, positioning method, and related apparatus19 Mar 2026US 2026/0082177 A1Huawei Technologies Co., Ltd.
- User-specific demodulation reference signals29 Jan 2026US 2026/0031954 A1T-Mobile USA, Inc.
Most cited
By later US patents
- OFDM transmission/reception system and transmitting/receiving apparatus269US 5,694,389 AKabushiki Kaisha Toshiba · 1997
- Method, apparatus, and system for time synchronization152US 8,432,851 B2Huawei Technologies Co., Ltd. · 2013
- Method of transmitting orthogonal frequency division multiplexing signal and receiver thereof107US 5,774,450 AMatsushita Electric Industrial Co., Ltd. · 1998
- Timing synchronization in OFDM communications receivers69US 6,754,170 B1Symbol Technologies, Inc. · 2004
- Preambles in OFDMA system50US 7,961,696 B2Nortel Networks Limited · 2011