H04L 27/00
Modulated-carrier systems
H04L27/00 (Modulated-carrier systems) appears on 43,792 US grants and 45,159 published applications in this corpus.
Search patents in H04L- Granted patents
- 43,792
- Published applications
- 45,159
- Assignees
- 4,568
- Inventors
- 35,037
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 83 | 0 |
| 1977 | 74 | 0 |
| 1978 | 74 | 0 |
| 1979 | 36 | 0 |
| 1980 | 55 | 0 |
| 1981 | 58 | 0 |
| 1982 | 69 | 0 |
| 1983 | 53 | 0 |
| 1984 | 97 | 0 |
| 1985 | 102 | 0 |
| 1986 | 126 | 0 |
| 1987 | 133 | 0 |
| 1988 | 84 | 0 |
| 1989 | 131 | 0 |
| 1990 | 97 | 0 |
| 1991 | 122 | 0 |
| 1992 | 151 | 0 |
| 1993 | 144 | 0 |
| 1994 | 170 | 0 |
| 1995 | 206 | 0 |
| 1996 | 276 | 0 |
| 1997 | 278 | 0 |
| 1998 | 393 | 0 |
| 1999 | 382 | 0 |
| 2000 | 397 | 0 |
| 2001 | 379 | 181 |
| 2002 | 446 | 673 |
| 2003 | 463 | 752 |
| 2004 | 524 | 1013 |
| 2005 | 505 | 1174 |
| 2006 | 840 | 1265 |
| 2007 | 759 | 1528 |
| 2008 | 920 | 1575 |
| 2009 | 1030 | 1809 |
| 2010 | 1401 | 1761 |
| 2011 | 1499 | 1577 |
| 2012 | 1858 | 1644 |
| 2013 | 2014 | 1760 |
| 2014 | 2219 | 1874 |
| 2015 | 2324 | 2175 |
| 2016 | 2050 | 2130 |
| 2017 | 2154 | 2246 |
| 2018 | 2083 | 2286 |
| 2019 | 2469 | 2750 |
| 2020 | 2582 | 2764 |
| 2021 | 2387 | 2439 |
| 2022 | 2135 | 2398 |
| 2023 | 2161 | 2148 |
| 2024 | 2144 | 1890 |
| 2025 | 1737 | 1877 |
| 2026 | 918 | 1470 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H04L 27/26Systems using multi-frequency codes25,912
- H04L 27/32Carrier systems characterised by combinations of two or more of the types8,216
- H04L 27/18Phase-modulated carrier systems, i.e. using phase-shift keying6,170
- H04L 27/0014Carrier regulation3,323
- H04L 27/10Frequency-modulated carrier systems, i.e. using frequency-shift keying2,515
- H04L 27/02Amplitude-modulated carrier systems2,489
- H04L 27/0008Arrangements for allowing a transmitter or receiver to use more than one1,838
- H04L 27/0006Assessment of spectral gaps suitable for allocating digitally modulated signals1,610
Recent patents
- Cyclic shift diversity-based communication method, apparatus, and system6 Oct 2026US 12,756,431 B2Huawei Technologies Co., Ltd.
- Information transmission method and apparatus, communication node, and storage medium6 Oct 2026US 12,756,442 B2Zte Corporation
- Digital predistortion with hybrid basis-function-based actuator and neural network6 Oct 2026US 12,756,599 B2Analog Devices, Inc.
- Cancellation pulse generation with reduced waveform storage to reduce crests in transmission signals6 Oct 2026US 12,756,601 B2Texas Instruments Incorporated
- CP-transparent OOK OFDM waveform for an ambient IoT6 Oct 2026US 12,756,604 B2QUALCOMM Incorporated
- Joint communication and sensing8 Oct 2026US 2026/0309836 A1Telefonaktiebolaget LM Ericsson (publ)
- Frequency hopping of reference signal8 Oct 2026US 2026/0312618 A1Nokia Technologies Oy
- Method and device for carrying out multi-layer transmission in wireless lan system8 Oct 2026US 2026/0312637 A1LG Electronics Inc.
- Differential phase shift keying demodulator8 Oct 2026US 2026/0312694 A1BAE Systems Information and Electronic Systems Integration Inc.
- Sensing signal transmission method, electronic device, and storage medium8 Oct 2026US 2026/0312743 A1Zte Corporation
Most cited
By later US patents
- Method and apparatus for a RADSL transceiver warm start activation procedure with precoding938US 5,852,630 AGlobespan Semiconductor, Inc. · 1998
- Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines879US 5,479,447 AThe Board of Trustees of the Leland Stanford Junior University · 1995
- Method and apparatus for measuring reporting channel state information in a high efficiency, high performance communications system793US 6,473,467 B1QUALCOMM Incorporated · 2002
- Hierarchical data collection network supporting packetized voice communications among wireless terminals and telephones789US 5,726,984 ANorand Corporation · 1998
- Method and apparatus for multiple access between transceivers in wireless communications using OFDM spread spectrum691US 5,282,222 A1994