H04L 27/34
Amplitude- and phase-modulated carrier systems
Official title: Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
H04L27/34 (Amplitude- and phase-modulated carrier systems) appears on 8,038 US grants and 7,551 published applications in this corpus.
Search patents in H04L- Granted patents
- 8,038
- Published applications
- 7,551
- Assignees
- 1,516
- Inventors
- 10,100
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 9 | 0 |
| 1978 | 7 | 0 |
| 1979 | 3 | 0 |
| 1980 | 3 | 0 |
| 1981 | 8 | 0 |
| 1982 | 9 | 0 |
| 1983 | 3 | 0 |
| 1984 | 13 | 0 |
| 1985 | 27 | 0 |
| 1986 | 30 | 0 |
| 1987 | 28 | 0 |
| 1988 | 30 | 0 |
| 1989 | 32 | 0 |
| 1990 | 25 | 0 |
| 1991 | 24 | 0 |
| 1992 | 43 | 0 |
| 1993 | 26 | 0 |
| 1994 | 33 | 0 |
| 1995 | 56 | 0 |
| 1996 | 67 | 0 |
| 1997 | 75 | 0 |
| 1998 | 96 | 0 |
| 1999 | 90 | 0 |
| 2000 | 87 | 0 |
| 2001 | 78 | 36 |
| 2002 | 97 | 152 |
| 2003 | 103 | 168 |
| 2004 | 99 | 204 |
| 2005 | 99 | 218 |
| 2006 | 188 | 221 |
| 2007 | 183 | 295 |
| 2008 | 214 | 295 |
| 2009 | 227 | 294 |
| 2010 | 247 | 300 |
| 2011 | 297 | 318 |
| 2012 | 318 | 302 |
| 2013 | 394 | 323 |
| 2014 | 439 | 396 |
| 2015 | 497 | 465 |
| 2016 | 403 | 435 |
| 2017 | 424 | 409 |
| 2018 | 434 | 375 |
| 2019 | 456 | 449 |
| 2020 | 452 | 417 |
| 2021 | 393 | 329 |
| 2022 | 290 | 283 |
| 2023 | 287 | 280 |
| 2024 | 274 | 241 |
| 2025 | 208 | 209 |
| 2026 | 104 | 137 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H04L 27/36Modulator circuits3,283
- H04L 27/38Demodulator circuits2,509
- H04L 27/3405Modifications of the signal space to increase the efficiency of transmission1,582
- H04L 27/3488Multiresolution systems610
- H04L 27/345Modifications of the signal space to allow the transmission of additional information549
- H04L 27/3494Using non - square modulating pulses69
Recent patents
- Digital predistortion with hybrid basis-function-based actuator and neural network6 Oct 2026US 12,756,599 B2Analog Devices, Inc.
- Data sending method, data receiving method, and related apparatus6 Oct 2026US 12,756,614 B2Huawei Technologies Co., Ltd.
- Transmission method, reception method, transmitter, and receiver29 Sep 2026US 12,750,159 B2Panasonic Intellectual Property Corporation of America
- Apparatus for transmitting and receiving signal29 Sep 2026US 12,750,161 B2Samsung Electronics Co., Ltd.
- Demodulation of modulation constellations with probabilistic amplitude shaping29 Sep 2026US 12,750,268 B2QUALCOMM Incorporated
- Differential phase shift keying demodulator8 Oct 2026US 2026/0312694 A1BAE Systems Information and Electronic Systems Integration Inc.
- Transmitter and method for transmitting data block in wireless communication system8 Oct 2026US 2026/0312754 A1Electronics and Telecommunications Research Institute
- Probabilistic shaping for flexible spectrum integration8 Oct 2026US 2026/0312847 A1QUALCOMM Incorporated
- Approximations in distribution matching procedures8 Oct 2026US 2026/0312859 A1QUALCOMM Incorporated
- Method for communication over time-based channels8 Oct 2026US 2026/0312860 A1
Most cited
By later US patents
- Method and apparatus for multiple access between transceivers in wireless communications using OFDM spread spectrum691US 5,282,222 A1994
- Lower overhead method for data transmission using ATM and SCDMA over hybrid fiber coax cable plant683US 5,991,308 ATerayon Communication Systems, Inc. · 1999
- Apparatus and method for digital data transmission using orthogonal codes473US 6,356,555 B1Terayon Communications Systems, Inc. · 2002
- Non-linear adaptive AM/AM and AM/PM pre-distortion compensation with time and temperature compensation for low power applications412US 7,215,716 B12007
- Computer-based multifunction personal communications system375US 5,452,289 AMulti-Tech Systems, Inc. · 1995