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Karthik Ramasubramanian

from Sunnyvale, CA
Age ~64
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Related to:
Sujata R Ravi, 50Anika RajamaniRavi Rajamani, 49Muthukri Rajamani
Connected to:
Chitra Ramasubbu, 43Ganesh K Ramasubramanian, 49Karthik K Ramasubramanian, 39Ramkumar Ramasubramanian, 49Sreeram Ramasubramanian, 48Subramaniam Ramasubramanian, 41Sureshraja RamasubramanianAditya Ramaswamy, 32Alla V Ramaswamy, 46Anand S Ramaswamiengar, 51

Karthik Ramasubramanian Phones & Addresses

  • 655 S Fair Oaks Ave #B106, Sunnyvale, CA 94086 (408) 736-1447
  • Cleveland, MN
  • San Diego, CA
  • Irving, TX
  • Santa Clara, CA
  • Columbus, OH
  • Schaumburg, IL

Resumes

Resumes

Karthik Ramasubramanian Photo 1

Karthik Ramasubramanian

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Publications

Us Patents

Method And System For Multirate Multiuser Modulation

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US Patent:
7139237, Nov 21, 2006
Filed:
Sep 24, 2001
Appl. No.:
09/961516
Inventors:
Vijay Nangia - Schaumburg IL, US
Kevin Lynn Baum - Rolling Meadows IL, US
Karthik Ramasubramanian - Sunnyvale CA, US
Assignee:
Motorola, Inc. - Schaumburg IL
International Classification:
H04J 13/02
US Classification:
370208, 370330, 370430
Abstract:
A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency diversity and preserving low peak-to-average power ratios and orthogonality between users at different data rates. The modulation scheme allows user-specific data block and repetition sizes, as well as user-specific modulation codes. Code assignment rules are provided for maintaining orthogonality between users having different data rates. Block and phase ramp modulation codes can be used. Asynchronous transmissions by users are supported by ensuring that the length of the cyclic extension is sufficiently long to tolerate worst case relative signal arrival delays between users and the channel pulse response duration over the communication medium. The modulation scheme can be employed in wireless communication systems, such as cellular or paging systems.

Method And System For Multirate Multiuser Modulation

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US Patent:
7701839, Apr 20, 2010
Filed:
Nov 20, 2006
Appl. No.:
11/561481
Inventors:
Vijay Nangia - Schaumburg IL, US
Kevin Lynn Baum - Rolling Meadows IL, US
Karthik Ramasubramanian - Sunnyvale CA, US
Assignee:
Motorola, Inc. - Schaumburg IL
International Classification:
H04L 5/12
H04J 1/00
H04B 7/208
H04J 1/06
US Classification:
370208, 370329, 370344, 370480, 375260
Abstract:
A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency diversity and preserving low peak-to-average power ratios and orthogonality between user data rates. The modulation scheme allows user-specific data block and repetition sizes, as well as user-specific modulation codes. Code assignment rules are provided for maintaining orthogonality between the different user data rates. Block and phase ramp modulation codes can be used. Asynchronous transmissions by users are supported by ensuring that the length of the cyclic extension is sufficiently long to tolerate worst case relative signal arrival delays between users and the channel pulse response duration over the communication medium. The modulation scheme can be employed in wireless communication systems, such as cellular or paging systems.

Method And System For Timing Recovery And Delay Spread Estimation In A Communication System

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US Patent:
20030026360, Feb 6, 2003
Filed:
Jul 31, 2001
Appl. No.:
09/919050
Inventors:
Karthik Ramasubramanian - Sunnyvale CA, US
Kevin Baum - Rolling Meadows IL, US
International Classification:
H03D001/00
H04L027/06
H04L001/00
US Classification:
375/343000, 375/348000, 375/350000
Abstract:
A timing recovery scheme demarcates a complete range of inter-symbol interference free (ISI-free) sampling positions available in a cyclically extended symbol. The timing recovery scheme computes an ensemble correlation between the cyclic extension and the data part of symbols to estimate timing. The ensemble correlation function retains delay-spread and timing information by separately maintaining the correlation value for each sample position within the symbol duration and combines the correlation values for identical sample positions over an ensemble of symbols. In this manner, the scheme not only provides timing estimates, but can also provide estimates of the multipath delay-spread in a channel. The delay-spread estimates provide valuable information about the nature of the channel. A receiver can use this information, for example, to adjust the frequency-domain channel interpolation filter bandwidth in order to improve performance for the given channel condition.

Collection And Aggregation Of Statistics For Observability In A Container Based Network

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US Patent:
20220247660, Aug 4, 2022
Filed:
Jun 18, 2021
Appl. No.:
17/351610
Inventors:
- San Francisco CA, US
Karthik Krishnan Ramasubramanian - Newark CA, US
Shaun Crampton - London, GB
Sridhar Mahadevan - Vancouver, CA
Tomas Hruby - Vancouver, CA
International Classification:
H04L 12/26
H04L 29/12
H04L 29/06
Abstract:
Information associated with a data packet sent to or from a network interface associated with a cluster node is obtained. The information associated with the data packet is correlated to a particular computing unit associated with the cluster node. The information associated with the data packet and information associated with the particular computing unit is aggregated across processes running on the particular computing unit. The aggregated information associated with the particular computing unit is provided to a flow log analyzer.

Wireless Data Transmission

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US Patent:
20220210249, Jun 30, 2022
Filed:
Mar 18, 2022
Appl. No.:
17/698492
Inventors:
- Phoenix AZ, US
Karthik RAMASUBRAMANIAN - Santa Clara CA, US
Denis BYKOV - Fremont CA, US
James WOOD - Seaside CA, US
Jun JIN - Shanghai, CN
Lin FANG - San Jose CA, US
Hongping LIU - Milpitas CA, US
Benjamin MUNG - Shanghai, CN
Ping LU - Shanghai, CN
Assignee:
SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC - Phoeix AZ
International Classification:
H04L 69/166
H04L 69/22
H04L 69/04
H04L 1/16
H04W 72/04
H04L 1/00
H04W 28/06
Abstract:
An example method may include receiving, at a device, a first frame over a wireless network and constructing a preliminary data portion of a second frame. The second frame may be configured for transmission over the wireless network. The method may also include in response to the receiving of the first frame at the device, beginning transmission of a header portion of the second frame over the wireless network and after the beginning transmission of the header portion of the second frame, constructing, based on the preliminary data portion, a finalized data portion of the second frame for transmission over the wireless network.

Wireless Data Transmission

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US Patent:
20210289059, Sep 16, 2021
Filed:
Mar 11, 2020
Appl. No.:
16/815599
Inventors:
- Phoenix AZ, US
Karthik RAMASUBRAMANIAN - Santa Clara CA, US
Denis BYKOV - Fremont CA, US
James WOOD - Seaside CA, US
Jun JIN - Shanghai, CN
Lin FANG - San Jose CA, US
Hongping LIU - Milpitas CA, US
Benjamin MUNG - Shanghai, CN
Ping LU - Shanghai, CN
Assignee:
SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC - Phoenix AZ
International Classification:
H04L 29/06
H04W 28/06
H04W 72/04
H04L 1/00
H04L 1/16
Abstract:
An example method may include receiving, at a device, a first frame over a wireless network and constructing a preliminary data portion of a second frame. The second frame may be configured for transmission over the wireless network. The method may also include in response to the receiving of the first frame at the device, beginning transmission of a header portion of the second frame over the wireless network and after the beginning transmission of the header portion of the second frame, constructing, based on the preliminary data portion, a finalized data portion of the second frame for transmission over the wireless network.
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Karthik Ramasubramanian from Sunnyvale, CA, age ~64 Get Report