41
Ravi Narasimhan, Hemanth Sampath: Scalable MIMO-OFDM PHY for high throughput WLANS. Marvell International, January 1, 2013: US08345534 (4 worldwide citation)

A transceiver including a frame formatter configured to generate a frame including orthogonal frequency-division multiplexing (OFDM) symbols for transmission on a plurality of antennas. The frame includes a short preamble including a short training symbol including a plurality of adjacent tones, whe ...


42
Ravi Narasimhan, Hemanth Sampath: Scalable MIMO-OFDM PHY for high throughput WLANs. Marvell International, August 9, 2011: US07995455 (4 worldwide citation)

A MIMO-OFDM system may use different types of space-frequency code matrices for encoding data on multiple substreams for transmission on multiple antennas. The system may utilize a MIMO-OFDM frame format that includes additional long training OFDM symbols for training additional antennas and for lin ...


43
Ravi Narasimhan, Hemanth Sampath, Hsiao Cheng Tang: MIMO-OFDM receiver processing. Marvell International, September 14, 2010: US07796681 (4 worldwide citation)

A receiver in a MIMO-OFDM system may process OFDM symbols received on a number (MR) of receive antennas. The system may utilize a MIMO-OFDM frame format that includes additional long training OFDM symbols, for training additional antennas and for link adaptation, and a header with an additional SIGN ...


44
Hsiao Cheng Tang, Ravi Narasimhan, Hemanth Sampath: Technique for reducing physical layer (PHY) overhead in wireless LAN systems. Marvell International, September 27, 2011: US08027366 (4 worldwide citation)

A physical layer (PHY) packet aggregation technique may be used to reduce the percentage of PHY overhead in data transmission in order to achieve better PHY efficiency and higher throughput. Higher layer packets in an upper layer data queue may be fragmented into appropriate small-size sub-packets, ...


45
Hemanth Sampath, Alexei Gorokhov, Aamod Khandekar, Edward Harrison Teague, David Jonathan Julian, Tamer Kadous, Arak Sutivong: Systems and methods for control channel signaling. QUALCOMM Incorporated, Liem T Do, November 10, 2015: US09184870 (3 worldwide citation)

Methods and apparatuses are disclosed for providing flexible channel information feedback. In some cases this may be according to reporting types assigned by one or more sectors, with different reporting types for each sector. In other cases, a reporting mode is determined to determine the reporting ...


46
Ravi Narasimhan, Hemanth Sampath: Data rate adaptation in multiple-in-multiple-out systems. Marvell International, September 10, 2013: US08532081 (3 worldwide citation)

A transmit data rate adaptation method in a multiple-in-multiple-out (MIMO) system with a first transceiver and a second transceiver. The first transceiver transmits signals to the second transceiver. The second transceiver analyzes channel quality of the received signals and uses link adaptation to ...


47
Sameer Vermani, Santosh P Abraham, Mohammad Hossein Taghavi Nasrabadi, Vincent K Jones IV, Hemanth Sampath: Systems and methods for wireless communication of packets having a plurality of formats. Qualcomm Incorporated, S Hossain Beladi, January 13, 2015: US08934413 (3 worldwide citation)

Systems and methods for communicating packets having a plurality of formats are described herein. In some aspects, a signal (SIG) field in the preamble of a packet may indicate whether an extension field, such as an extension SIG field or SIG-B field, is included in the packet. In another aspect, on ...


48
Hemanth Sampath: Multiple hypothesis decoding. QUALCOMM Incorporated, Stanton Braden, July 17, 2012: US08223904 (3 worldwide citation)

A multiple-input receiver for processing one or more communication signals is disclosed. The receiver includes a first and second demodulators, a decoder and decision logic. The first and second demodulators respectively use a first algorithm and a second algorithm and are both coupled to the receiv ...


49
Hemanth Sampath, Richard Van Nee, Albert Van Zeist, Geert Arnout Awater: Mixed mode preamble design for signaling number of streams per client. QUALCOMM Incorporated, Dang M Vo, December 4, 2012: US08325644 (3 worldwide citation)

Certain aspects of the present disclosure present a technique for designing a signal (SIG) field of a mixed mode preamble transmitted to a plurality of user terminals. The SIG field can signal a number of spatial streams assigned to each user. The SIG field is designed such that a robust interferenc ...


50
Simone Merlin, Hemanth Sampath, Sameer Vermani, Richard van Nee: Precoding technique for multiuser MIMO based on eigenmode selection and MMSE. QUALCOMM Incorporated, Kenyon S Jenckes, November 6, 2012: US08306089 (3 worldwide citation)

The present disclosure proposes a method for precoding of transmission signal at an access point of a multiuse system based on eigenmode selection and minimum mean square error (MMSE) processing. The most reliable eigenmodes of every multiple-input multiple-output (MIMO) channel in the system can be ...