H04L 27/2651
Modification of fast fourier transform [fft] or discrete fourier transform [dft] demodulators
Official title: {Modification of fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators for performance improvement}
H04L27/2651 (Modification of fast fourier transform [fft] or discrete fourier transform [dft] demodulators) appears on 143 US grants and 158 published applications in this corpus.
Search patents in H04L- Granted patents
- 143
- Published applications
- 158
- Assignees
- 111
- Inventors
- 352
- Latest grant
- 13 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 3 |
| 2003 | 1 | 5 |
| 2004 | 2 | 4 |
| 2005 | 1 | 5 |
| 2006 | 9 | 4 |
| 2007 | 1 | 8 |
| 2008 | 3 | 12 |
| 2009 | 3 | 8 |
| 2010 | 15 | 6 |
| 2011 | 4 | 7 |
| 2012 | 7 | 5 |
| 2013 | 4 | 6 |
| 2014 | 10 | 10 |
| 2015 | 11 | 10 |
| 2016 | 8 | 10 |
| 2017 | 8 | 11 |
| 2018 | 15 | 14 |
| 2019 | 10 | 8 |
| 2020 | 12 | 5 |
| 2021 | 6 | 3 |
| 2022 | 2 | 2 |
| 2023 | 3 | 2 |
| 2024 | 1 | 3 |
| 2025 | 4 | 3 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for pilot-aided channel estimation in ofdm systems regardless of the frequency selectivity severity of the channel13 Jan 2026US 12,526,171 B2
- Method for disseminating scaling information and application thereof in VLSI implementation of fixed-point FFT18 Nov 2025US 12,476,727 B2Imec Vzw
- Microphone reference echo cancellation14 Oct 2025US 12,444,431 B1Amazon Technologies, Inc.
- Method for 5G NR low-density parity-check decoding1 Jul 2025US 12,348,311 B2PCTEL, Inc.
- System and method to reduce latency in serial FFT based OFDM receiver systems with de-interleaver29 Apr 2025US 12,289,190 B2Cypress Semiconductor Corporation
- Signal receiving method and apparatus25 Jun 2026US 2026/0180566 A1Huawei Technologies Co., Ltd.
- Electronic device and method for fast fourier transform25 Jun 2026US 2026/0180846 A1Samsung Electronics Co., Ltd.
- Communication method and communication system28 May 2026US 2026/0149629 A1Ningbo University
- Swin transformer-based wireless channel estimation1 Jan 2026US 2026/0004403 A1Samsung Electronics Co., Ltd.
- Transmit device for generating an ook modulated spread dft-s-ofdm wake-up signal30 Oct 2025US 2025/0337630 A1Huawei Technologies Co., Ltd.
Most cited
By later US patents
- Variable scaling of 16-bit fixed point fast fourier forward and inverse transforms to improve precision for implementation of discrete multitone for asymmetric digital subscriber loops143US 6,137,839 ATexas Instruments Incorporated · 2000
- Method and apparatus for transmitting orthogonal-multi-carrier signal61US 6,747,946 B1Victor Company of Japan, Ltd. · 2004
- Orthogonal frequency division multiplex modulation apparatus and orthogonal frequency division multiplex demodulation apparatus57US 5,675,572 ASony Corporation · 1997
- Optimized FFT/IFFT module33US 7,333,422 B2Zarbana Digital Fund LLC · 2008
- Computation reduction in OFDM system using frequency domain processing27US 7,072,411 B1Cisco Technology, Inc. · 2006