Inventor · disambiguated record
Ravi Narasimhan
Also filed as: NARASIMHAN RAVI · NARASIMHAN RAVI K
124 granted patents·3 pending applications·2,358 citations·filing 1999–2024
99Inventor score
Files withVITAL CONNECT INC38MARVELL INT LTD37NARASIMHAN RAVI16APPLE INC8QUANTENNA COMMUNICATIONS INC4
Top patents by PatentIndex Score
127 records- 0198US7016649B1Space-time and space-frequency hopping for capacity enhancement of mobile data systemsKATHREIN WERKE KG·Filed 2001·Granted Mar 21, 2006·207 cites·60 claims
- 0297US10324109B2Determining a time period a person is in bedVITAL CONNECT INC·Filed 2016·Granted Jun 18, 2019·17 cites·10 claims
- 0397US10317427B2Calibration of a chest-mounted wireless sensor device for posture and activity detectionVITAL CONNECT INC·Filed 2017·Granted Jun 11, 2019·20 cites·18 claims
- 0497US7532693B1Method and apparatus for acquistion and tracking of orthogonal frequency division multiplexing symbol timing, carrier frequency offset and phase noiseMARVELL INT LTD·Filed 2007·Granted May 12, 2009·57 cites·25 claims
- 0597US6330460B1Simultaneous forward link beam forming and learning method for mobile high rate data trafficMETAWAVE COMM CORP·Filed 2000·Granted Dec 11, 2001·207 cites·20 claims
- 0696US8416759B1Carrier frequency offset and doppler frequency estimation and correction for OFDMA and SC-FDMANARASIMHAN RAVI·Filed 2010·Granted Apr 9, 2013·64 cites·22 claims
- 0795US10422814B2Fall detection using machine learningVITAL CONNECT INC·Filed 2013·Granted Sep 24, 2019·19 cites·14 claims
- 0895US9035794B2Posture calibration for activity monitoringNARASIMHAN RAVI·Filed 2012·Granted May 19, 2015·29 cites·18 claims
- 0995US8792325B1Apparatuses and method for mapping bits of orthogonal frequency division multiplexing symbols to subcarriers and compensating for an imbalance between in-phase and quadrature-phase signalsMARVELL INT LTD·Filed 2013·Granted Jul 29, 2014·19 cites·21 claims
- 1095US7408976B1MIMO-OFDM receiver processing with frequency and channel estimationMARVELL INT LTD·Filed 2004·Granted Aug 5, 2008·62 cites·50 claims
- 1194US11324420B2Detection of sleep apnea using respiratory signalsVITAL CONNECT INC·Filed 2019·Granted May 10, 2022·21 cites·18 claims
- 1294US10383562B2Measuring psychological stress from cardiovascular and activity signalsVITAL CONNECT INC·Filed 2017·Granted Aug 20, 2019·19 cites·11 claims
- 1394US8305921B2Channel selection and interference suppressionNARASIMHAN RAVI·Filed 2009·Granted Nov 6, 2012·21 cites·22 claims
- 1494US7016651B1Apparatus and method for measuring signal quality of a wireless communications linkMARVELL INT LTD·Filed 2002·Granted Mar 21, 2006·83 cites·68 claims
- 1593US10617325B2Respiratory rate measurement using a combination of respiration signalsVITAL CONNECT INC·Filed 2017·Granted Apr 14, 2020·19 cites·7 claims
- 1693US10433781B2Measuring psychological stress from cardiovascular and activity signalsVITAL CONNECT INC·Filed 2017·Granted Oct 8, 2019·17 cites·16 claims
- 1793US10213163B2Low-distortion ECG denoisingVITAL CONNECT INC·Filed 2018·Granted Feb 26, 2019·17 cites·20 claims
- 1893US10123716B2Adaptive selection of digital egg filterVITAL CONNECT INC·Filed 2017·Granted Nov 13, 2018·17 cites·20 claims
- 1993US9980678B2Psychological acute stress measurement using a wireless sensorVITAL CONNECT INC·Filed 2016·Granted May 29, 2018·23 cites·16 claims
- 2093US9855003B2Measuring psychological stress from cardiovascular and activity signalsVITAL CONNECT INC·Filed 2016·Granted Jan 2, 2018·17 cites·10 claims
- 2193US9788778B2Measuring psychological stress from cardiovascular and activity signalsVITAL CONNECT INC·Filed 2016·Granted Oct 17, 2017·19 cites·16 claims
- 2293US8358588B2Interference-cognitive transmissionQUANTENNA COMMUNICATIONS INC·Filed 2010·Granted Jan 22, 2013·14 cites·10 claims
- 2393US8238496B1Multiuser multiple-input multiple-output (MU-MIMO) channel estimation for multicarrier communicationsNARASIMHAN RAVI·Filed 2010·Granted Aug 7, 2012·37 cites·28 claims
- 2492US10772512B2Blood pressure monitoring using a multi-function wrist-worn deviceAPPLE INC·Filed 2017·Granted Sep 15, 2020·13 cites·7 claims
- 2592US9588135B1Method and system for fall detection of a userNARASIMHAN RAVI·Filed 2012·Granted Mar 7, 2017·31 cites·15 claims
- 2692US8149810B1Data rate adaptation in multiple-in-multiple-out systemsNARASIMHAN RAVI·Filed 2003·Granted Apr 3, 2012·42 cites·224 claims
- 2792US7826438B1Circuits, architectures, systems, methods, algorithms and software for reducing contention and/or handling channel access in a networkMARVELL INT LTD·Filed 2004·Granted Nov 2, 2010·73 cites·60 claims
- 2892US7505788B1Spatial multiplexing with antenna and constellation selection for correlated MIMO fading channelsMARVELL INT LTD·Filed 2003·Granted Mar 17, 2009·48 cites·34 claims
- 2991US10213146B2Measuring psychological stress from cardiovascular and activity signalsVITAL CONNECT INC·Filed 2017·Granted Feb 26, 2019·17 cites·20 claims
- 3091US8532081B1Data rate adaptation in multiple-in-multiple-out systemsNARASIMHAN RAVI·Filed 2012·Granted Sep 10, 2013·10 cites·21 claims
- 3191US8223893B1Compensation for residual frequency offset, phase noise and sampling phase offset in wireless networksNARASIMHAN RAVI·Filed 2009·Granted Jul 17, 2012·14 cites·18 claims
- 3291US8027366B1Technique for reducing physical layer (PHY) overhead in wireless LAN systemsMARVELL INT LTD·Filed 2010·Granted Sep 27, 2011·14 cites·20 claims
- 3391US7796681B1MIMO-OFDM receiver processingMARVELL INT LTD·Filed 2008·Granted Sep 14, 2010·12 cites·40 claims
- 3491US7577085B1Multicarrier transmit diversityMARVELL INT LTD·Filed 2002·Granted Aug 18, 2009·62 cites·62 claims
- 3591US7218691B1Method and apparatus for estimation of orthogonal frequency division multiplexing symbol timing and carrier frequency offsetMARVELL INT LTD·Filed 2002·Granted May 15, 2007·57 cites·84 claims
- 3690US9307908B2Measuring psychological stress from cardiovascular and activity signalsVITAL CONNECT INC·Filed 2012·Granted Apr 12, 2016·29 cites·8 claims
- 3790US8345534B1Scalable MIMO-OFDM PHY for high throughput WLANSMARVELL INT LTD·Filed 2011·Granted Jan 1, 2013·8 cites·19 claims
- 3889US10702171B2Systems, devices, and methods for measuring blood pressure of a userAPPLE INC·Filed 2015·Granted Jul 7, 2020·12 cites·17 claims
- 3989US10517489B2Wrist worn accelerometer for pulse transit time (PTT) measurements of blood pressureAPPLE INC·Filed 2015·Granted Dec 31, 2019·12 cites·23 claims
- 4089US9986951B1Low-distortion ECG denoisingVITAL CONNECT INC·Filed 2013·Granted Jun 5, 2018·27 cites·8 claims
- 4189US9636029B1Adaptive selection of digital ECG filterVITAL CONNECT INC·Filed 2013·Granted May 2, 2017·26 cites·11 claims
- 4289US9545227B2Sleep apnea syndrome (SAS) screening using wearable devicesVITAL CONNECT INC·Filed 2014·Granted Jan 17, 2017·30 cites·16 claims
- 4389US8693331B1Rate adaptation in wireless systemsSAMPATH HEMANTH·Filed 2011·Granted Apr 8, 2014·7 cites·17 claims
- 4489US7881237B1Compensation for residual frequency offset, phase noise and I/Q imbalance in OFDM modulated communicationsMARVELL INT LTD·Filed 2009·Granted Feb 1, 2011·12 cites·11 claims
- 4589US7864678B1Rate adaptation in wireless systemsMARVELL INT LTD·Filed 2003·Granted Jan 4, 2011·42 cites·70 claims
- 4689US7616719B1Compensation for residual frequency offset, phase noise and sampling phase offset in wireless networksMARVELL INT LTD·Filed 2008·Granted Nov 10, 2009·11 cites·26 claims
- 4788US10849555B1Devices and systems for correcting errors in blood pressure measurementsSULLIVAN THOMAS J·Filed 2016·Granted Dec 1, 2020·13 cites·18 claims
- 4888US10357163B1Respiratory rate detection using decomposition of ECGSELVARAJ NANDAKUMAR·Filed 2012·Granted Jul 23, 2019·37 cites·8 claims
- 4988US9818281B2Method and system for fall detection of a userNARASIMHAN RAVI·Filed 2011·Granted Nov 14, 2017·18 cites·17 claims
- 5088US8848686B1Single carrier-frequency-division multiple access (SC-FDMA) physical uplink control channel (PUCCH) 2/2a/2b detectionCHENG SHI·Filed 2011·Granted Sep 30, 2014·16 cites·22 claims
Showing the top 50 of 127 patent records by PatentIndex Score.
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