Patent Theme
Reference Signal Design & Optimization
Methods for designing, transmitting, and utilizing specific reference signals (e.g., DMRS, SRS, PT-RS) to enable accurate channel estimation, interference measurement, synchronization, or sensing in wireless communication systems.
18,252 US filings from 872 companies since 2023 · 2023: 4,346 · 2024: 5,915 · 2025: 5,471 · 2026 YTD: 2,520
Physical Transmission & Modulation
Top companies
Ranked by filings in this theme since 2023. 2026 is partial.
| # | Company | Since 2023 | 2023 | 2024 | 2025 | 2026 YTD | YoY |
|---|
| 1 | QUALCOMM Incorporated | 3,120 | 895 | 943 | 905 | 377 | -4.0% |
| 2 | Huawei Technologies Co., Ltd. | 1,243 | 251 | 360 | 439 | 193 | +21.9% |
| 3 | Telefonaktiebolaget LM Ericsson (publ) | 1,145 | 311 | 421 | 287 | 126 | -31.8% |
| 4 | Apple Inc. | 1,027 | 209 | 397 | 304 | 117 | -23.4% |
| 5 | SAMSUNG ELECTRONICS CO., LTD. | 852 | 201 | 249 | 258 | 144 | +3.6% |
| 6 | LG ELECTRONICS INC. | 786 | 255 | 243 | 198 | 90 | -18.5% |
| 7 | Nokia Technologies Oy | 696 | 108 | 258 | 236 | 94 | -8.5% |
| 8 | ZTE Corporation | 591 | 130 | 223 | 164 | 74 | -26.5% |
| 9 | BEIJING XIAOMI MOBILE SOFTWARE CO., LTD. | 549 | 88 | 160 | 185 | 116 | +15.6% |
| 10 | GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD. | 502 | 118 | 154 | 150 | 80 | -2.6% |
| 11 | InterDigital Patent Holdings, Inc. | 490 | 39 | 154 | 175 | 122 | +13.6% |
| 12 | VIVO MOBILE COMMUNICATION CO., LTD. | 472 | 112 | 153 | 150 | 57 | -2.0% |
| 13 | NTT DOCOMO, INC. | 370 | 91 | 147 | 91 | 41 | -38.1% |
| 14 | Ofinno, LLC | 311 | 68 | 88 | 104 | 51 | +18.2% |
| 15 | DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD. | 257 | 57 | 84 | 89 | 27 | +6.0% |
| 16 | Panasonic Intellectual Property Corporation of America | 227 | 62 | 80 | 67 | 18 | -16.2% |
| 17 | Lenovo (Beijing) Limited | 209 | 20 | 72 | 82 | 35 | +13.9% |
| 18 | MEDIATEK INC. | 179 | 44 | 58 | 51 | 26 | -12.1% |
| 19 | LENOVO (SINGAPORE) PTE. LTD. | 174 | 55 | 54 | 39 | 26 | -27.8% |
| 20 | INTEL CORPORATION | 173 | 39 | 73 | 43 | 18 | -41.1% |
| 21 | NEC CORPORATION | 172 | 55 | 56 | 35 | 26 | -37.5% |
| 22 | SHARP KABUSHIKI KAISHA | 161 | 25 | 54 | 53 | 29 | -1.9% |
| 23 | SHANGHAI LANGBO COMMUNICATION TECHNOLOGY COMPANY LIMITED | 156 | 40 | 87 | 27 | 2 | -69.0% |
| 24 | ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE | 147 | 31 | 38 | 51 | 27 | +34.2% |
| 25 | SONY GROUP CORPORATION | 138 | 38 | 49 | 36 | 15 | -26.5% |