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.

18,944 US filings from 886 companies since 2023 · 2023: 5,038 · 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	3,256	1,031	943	905	377	-4.0%
2	Huawei Technologies Co., Ltd.	1,284	292	360	439	193	+21.9%
3	Telefonaktiebolaget LM Ericsson (publ)	1,198	364	421	287	126	-31.8%
4	Apple Inc.	1,051	233	397	304	117	-23.4%
5	SAMSUNG ELECTRONICS CO., LTD.	891	240	249	258	144	+3.6%
6	LG ELECTRONICS INC.	832	301	243	198	90	-18.5%
7	Nokia Technologies Oy	712	124	258	236	94	-8.5%
8	ZTE Corporation	610	149	223	164	74	-26.5%
9	BEIJING XIAOMI MOBILE SOFTWARE CO., LTD.	565	104	160	185	116	+15.6%
10	GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.	522	138	154	150	80	-2.6%
11	InterDigital Patent Holdings, Inc.	505	54	154	175	122	+13.6%
12	VIVO MOBILE COMMUNICATION CO., LTD.	484	124	153	150	57	-2.0%
13	NTT DOCOMO, INC.	380	101	147	91	41	-38.1%
14	Ofinno, LLC	319	76	88	104	51	+18.2%
15	DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD.	274	74	84	89	27	+6.0%
16	Panasonic Intellectual Property Corporation of America	241	76	80	67	18	-16.2%
17	Lenovo (Beijing) Limited	219	30	72	82	35	+13.9%
18	LENOVO (SINGAPORE) PTE. LTD.	188	69	54	39	26	-27.8%
19	MEDIATEK INC.	184	49	58	51	26	-12.1%
20	INTEL CORPORATION	179	45	73	43	18	-41.1%
21	NEC CORPORATION	176	59	56	35	26	-37.5%
22	SHARP KABUSHIKI KAISHA	165	29	54	53	29	-1.9%
23	SHANGHAI LANGBO COMMUNICATION TECHNOLOGY COMPANY LIMITED	160	44	87	27	2	-69.0%
24	ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE	151	35	38	51	27	+34.2%
25	SONY GROUP CORPORATION	144	44	49	36	15	-26.5%