Inventor · Los Altos, CA, US

Ravi Narasimhan

124Patents
20h-index
45Co-inventors
90Inventor score

Filing activity: Sep 9, 1999 → Aug 31, 2022

Most-cited inventions

PatentTitleAreaCited byStatus
US6330460A Simultaneous forward link beam forming and learning method for mobile high rate data traffic Electricity 149 Expired
US7016649B1 Space-time and space-frequency hopping for capacity enhancement of mobile data systems Electricity 147 Expired
US7016651B1 Apparatus and method for measuring signal quality of a wireless communications link Electricity 47 Expired
US7577085B1 Multicarrier transmit diversity Electricity 44 Expired
US7826438B1 Circuits, architectures, systems, methods, algorithms and software for reducing contention and/or handling channel access in a network Electricity 42 Active
US6240291A Method for handoff in wireless communication systems using pattern recognition Electricity 40 Expired
US7532693B1 Method and apparatus for acquistion and tracking of orthogonal frequency division multiplexing symbol timing, carrier frequency offset and phase noise Electricity 38 Active
US7408976B1 MIMO-OFDM receiver processing with frequency and channel estimation Electricity 34 Expired
US8149810B1 Data rate adaptation in multiple-in-multiple-out systems Electricity 34 Active
US7218691B1 Method and apparatus for estimation of orthogonal frequency division multiplexing symbol timing and carrier frequency offset Electricity 30 Expired
US7505788B1 Spatial multiplexing with antenna and constellation selection for correlated MIMO fading channels Electricity 29 Expired
US9307908B2 Measuring psychological stress from cardiovascular and activity signals Human Necessities 26 Active
US9588135B1 Method and system for fall detection of a user Physics 25 Active
US7623441B1 Scalable space-frequency coding for MIMO systems Electricity 25 Active
US9035794B2 Posture calibration for activity monitoring Physics 24 Active
US8416759B1 Carrier frequency offset and doppler frequency estimation and correction for OFDMA and SC-FDMA Electricity 24 Active
US9545227B2 Sleep apnea syndrome (SAS) screening using wearable devices Physics 21 Active
US7606316B1 MIMO-OFDM preamble for channel estimation Electricity 21 Active
US9655559B2 Automated sleep staging using wearable sensors Human Necessities 20 Active
US7701975B1 Technique for reducing physical layer (PHY) overhead in wireless LAN systems Electricity 20 Active
US9980678B2 Psychological acute stress measurement using a wireless sensor Human Necessities 20 Active
US8614630B2 Fall detection using sensor fusion Physics 20 Active
US7864678B1 Rate adaptation in wireless systems Electricity 20 Active
US7697449B1 Adaptively determining a data rate of packetized information transmission over a wireless channel Electricity 19 Active
US9636029B1 Adaptive selection of digital ECG filter Human Necessities 19 Active

Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.