1
Hemanth Sampath: Method and system for multiple channel wireless transmitter and receiver phase and amplitude calibration. Intel Corporation, Michael A Proksch, March 1, 2005: US06862440 (96 worldwide citation)

The present invention provides a method and system for estimating common amplitude and phase errors of a multiple channel wireless system. The multiple channel wireless system includes a plurality of transmission channels formed between a plurality of transmission antennas and a plurality of receive ...


2
Hemanth Sampath, Peroor K Sebastian, Arogyaswami J Paulraj: Method and system for mode adaptation in wireless communication. Intel Corporation, Michael A Proksch, July 26, 2005: US06922445 (72 worldwide citation)

A method and system for selective mode adaptation for transmitting data by spatial multiplexing applicable in communications systems with a transmit unit having multiple transmit antennas or multiple transmit units and a receive unit having multiple receive antennas. A channel descriptor, such as ch ...


3
Hemanth Sampath: Transmit signal preprocessing based on transmit antennae correlations for multiple antennae systems. Intel Corporation, Michael A Proksch, December 12, 2006: US07149254 (60 worldwide citation)

The present invention provides a method and system for preprocessing transmit signals in spatial multiplexing and diversity systems that include multiple transmit antennae. The method includes generating a representative correlation matrix based upon estimates of a correlation between each pair of t ...


4
Hemanth Sampath, Tingfang Ji: Feedback to support restrictive reuse. QUALCOMM Incorporated, Sandip S Minhas, Milan I Patel, June 16, 2009: US07548752 (51 worldwide citation)

The scheduler in a base station needs CQI information from a terminal for all reuse sets every 5 ms. to decide on which re-use set to schedule a given terminal. For MIMO users, the problem is that the CQI cannot be reconstructed for all re-use sets, using the current design. Solution: (1) For Multip ...


5
Hemanth Sampath, Tamer Kadous: CQI and rank prediction for list sphere decoding and ML MIMO receivers. QUALCOMM Incorporated, Milan Patel, Kenyon S Jenckes, Thomas R Rouse, September 23, 2008: US07428269 (50 worldwide citation)

Systems and methodologies are described that facilitate integrating a list-sphere decoding design in a multiple input-multiple output (MIMO) wireless communication environment. According to various aspects, optimal rank selection and CQI computation for an optimal rank can be performed in conjunctio ...


6
Jean Daniel Sonnard, Zhigang Wang, Hemanth Sampath: Constraint assistant for circuit design. Cadence Design Systems, Wheelock Chan, Thomas Chan, August 26, 2008: US07418683 (41 worldwide citation)

A computer aided design tool and method for designing IC layouts by recommending subcircuit layout constraints based upon an automated identification from a circuit schematic of subcircuit types requiring special IC layout constraints. Subcircuit types are identified on the basis of netlist examinat ...


7
Hemanth Sampath, Tamer Kadous: Capacity based rank prediction for MIMO design. QUALCOMM Incorporated, Kenneth K Vu, Kenyon S Jenckes, July 28, 2009: US07567621 (39 worldwide citation)

The performance of a Single Code Word (SCW) design with low complexity MMSE receiver & rank prediction is similar to the Multiple Code Word (MCW) design with successive interference cancellation (SIC). A method of rank prediction comprises calculating MIMO channel matrices corresponding to layer tra ...


8
Hemanth Sampath, Tamer Kadous: Sphere decoding apparatus. QUALCOMM Incorporated, Stanton Braden, June 11, 2013: US08462859 (36 worldwide citation)

Methods and apparatuses for decoding codewords received over a MIMO channel are provided. According to one aspect of the disclosure, a cost function is computed for each constellation point of an Mth rank or spatial layer, and Ncand of those constellation points having minimum cost are preserved as ...


9
Kedar Shirali, Hemanth Sampath: Mechanism to improve quality of channel estimates in OFDM transmissions. Marvell International, May 12, 2009: US07532563 (33 worldwide citation)

An OFDM (Orthogonal Frequency Division Multiplexing) system may utilize pilot symbol structures including two or more pilot symbols with pilot information on alternate tones. The pilot information in one symbol is transmitted on mirror tones in another of the symbols. The pilot symbol structure may ...


10
Ravi Narasimhan, Hemanth Sampath, Hsiao Cheng Tang: MIMO-OFDM receiver processing with frequency and channel estimation. Marvell International, August 5, 2008: US07408976 (32 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 ...