H04L 27/261
Details of reference signals
Official title: {Details of reference signals}
H04L27/261 (Details of reference signals) appears on 6,451 US grants and 7,969 published applications in this corpus.
Search patents in H04L- Granted patents
- 6,451
- Published applications
- 7,969
- Assignees
- 693
- Inventors
- 5,522
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 10 | 0 |
| 2000 | 6 | 0 |
| 2001 | 4 | 3 |
| 2002 | 11 | 18 |
| 2003 | 11 | 31 |
| 2004 | 9 | 44 |
| 2005 | 23 | 115 |
| 2006 | 40 | 139 |
| 2007 | 53 | 179 |
| 2008 | 64 | 208 |
| 2009 | 73 | 236 |
| 2010 | 150 | 210 |
| 2011 | 160 | 199 |
| 2012 | 227 | 229 |
| 2013 | 268 | 248 |
| 2014 | 317 | 255 |
| 2015 | 285 | 314 |
| 2016 | 310 | 315 |
| 2017 | 301 | 376 |
| 2018 | 320 | 448 |
| 2019 | 446 | 570 |
| 2020 | 533 | 697 |
| 2021 | 555 | 637 |
| 2022 | 546 | 597 |
| 2023 | 513 | 547 |
| 2024 | 567 | 461 |
| 2025 | 441 | 458 |
| 2026 | 192 | 435 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Wireless communication method and communications device6 Oct 2026US 12,756,607 B2Quectel Wireless Solutions Co., Ltd.
- Narrow bandwidth transmission schemes in next-generation enhanced long range WLAN6 Oct 2026US 12,756,608 B2Mediatek Inc.
- Method and apparatus for synchronization for Vehicle-to-X communication6 Oct 2026US 12,757,134 B2Innovative Technology Lab Co., Ltd.
- Method and apparatus for configuring reference signal channel characteristics, and communication device29 Sep 2026US 12,750,191 B2Zte Corporation
- Optimization of distributed-tone resource unit pilot tone designs in wireless communications29 Sep 2026US 12,750,266 B2Mediatek Inc.
- Frequency hopping of reference signal8 Oct 2026US 2026/0312618 A1Nokia Technologies Oy
- Transmission configuration indication state determination method and apparatus, device, and storage medium8 Oct 2026US 2026/0312752 A1Beijing Xiaomi Mobile Software Co., Ltd.
- Method and apparatus for performing wireless communication8 Oct 2026US 2026/0312851 A1LG Electronics Inc.
- Communication method and communication apparatus8 Oct 2026US 2026/0312852 A1Huawei Technologies Co., Ltd.
- Wireless transmission device, wireless reception device, transmission method, and reception method8 Oct 2026US 2026/0312853 A1Panasonic Intellectual Property Corporation of America
Most cited
By later US patents
- Method and apparatus for measuring reporting channel state information in a high efficiency, high performance communications system793US 6,473,467 B1QUALCOMM Incorporated · 2002
- Timing and frequency synchronization of OFDM signals425US 5,732,113 AStanford University · 1998
- Signal modulation method resistant to echo reflections and frequency offsets296US 9,083,595 B2Cohere Technologies, Inc. · 2015
- OFDM transmission/reception system and transmitting/receiving apparatus269US 5,694,389 AKabushiki Kaisha Toshiba · 1997
- Modified preamble structure for IEEE 802.11a extensions to allow for coexistence and interoperability between 802.11a devices and higher data rate, MIMO or otherwise extended devices252US 7,599,332 B2QUALCOMM Incorporated · 2009