Ravi Narasimhan
124Patents
20h-index
45Co-inventors
90Inventor score
Filing activity: Sep 9, 1999 → Aug 31, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| 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.