Patents by Inventor Ravishankar H. Mahadevappa
Ravishankar H. Mahadevappa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9288715Abstract: A method and system utilized in a wireless communication system transmitting and receiving a multi-user packet is disclosed. The communication system includes a transmitter and a plurality of users in communication therewith. The method and system comprise determining a lowest coding scheme for transmitting the packet; and deriving a coding rate for the efficient transmission of the packet from a standard coding rate by de-puncturing bits in the packet. A system and method in accordance with the present invention provides for an efficient utilization of packet length, and improves the reliability by improving SNR, by lowering the MCS, un-puncturing, and/or repetition. More efficient packed data rates are also provided and both Tx and Rx compute parameters independently.Type: GrantFiled: July 1, 2014Date of Patent: March 15, 2016Assignee: MEDIATEK INC.Inventors: Kiran Uln, Thomas E. Pare, Jr., Ravishankar H. Mahadevappa
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Publication number: 20150071168Abstract: A method and system utilized in a wireless communication system transmitting and receiving a multi-user packet is disclosed. The communication system includes a transmitter and a plurality of users in communication therewith. The method and system comprise determining a lowest coding scheme for transmitting the packet; and deriving a coding rate for the efficient transmission of the packet from a standard coding rate by de-puncturing bits in the packet. A system and method in accordance with the present invention provides for an efficient utilization of packet length, and improves the reliability by improving SNR, by lowering the MCS, un-puncturing, and/or repetition. More efficient packed data rates are also provided and both Tx and Rx compute parameters independently.Type: ApplicationFiled: July 1, 2014Publication date: March 12, 2015Inventors: Kiran ULN, Thomas E. PARE, JR., Ravishankar H. MAHADEVAPPA
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Patent number: 8913515Abstract: Embodiments for improving multi-user downlink reception quality in WLANS are disclosed. In one embodiment, a method includes receiving, at a station, at least one multi-user sounding packet from an access point. The method also includes determining a sum of desired signal strengths from the at least one received sounding packet. The method also includes determining a sum of interference signal strengths from the at least one received sounding packet. The method also includes generating link quality metrics based on a ratio of the sum of desired signal strengths to the sum of interference signal strengths.Type: GrantFiled: December 7, 2011Date of Patent: December 16, 2014Assignee: Mediatek Singapore Pte. Ltd.Inventors: Ravishankar H. Mahadevappa, Thomas E. Pare, Jr., Kiran Uln
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Publication number: 20140348082Abstract: A method and system is disclosed for grouping the multiple stations connected to an access point (AP). The system and method comprise sending a sounding packet to a plurality of stations, wherein the stations may be all or part of the stations that are located within the range of the AP. The stations that receive the sounding packets respond to the AP, and the AP determines the channel state information (CSI) from the responses. According to the CSI, the AP divides the multiple stations into several groups. According to an embodiment of the present invention, a confirmation step is performed to each group of stations, respectively. The AP sends a second sounding packet to each group of stations, and verifies the CSI between each station group by group. Therefore, the method and system provides for monitoring the validation of each group by periodically sending sounding packets to each group.Type: ApplicationFiled: June 6, 2014Publication date: November 27, 2014Inventors: Thomas E. PARE, JR., Cheng-Hsuan WU, Yung-Szu TU, Kiran ULN, Ravishankar H. MAHADEVAPPA
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Patent number: 8824386Abstract: A method and system is disclosed for grouping the multiple stations connected to an access point (AP). The system and method comprise sending a sounding packet to a plurality of stations, wherein the stations may be all or part of the stations that are located within the range of the AP. The stations that receive the sounding packets respond to the AP, and the AP determines the channel state information (CSI) from the responses. According to the CSI, the AP divides the multiple stations into several groups. According to an embodiment of the present invention, a confirmation step is performed to each group of stations, respectively. The AP sends a second sounding packet to each group of stations, and verifies the CSI between each station group by group. Therefore, the method and system provides for monitoring the validation of each group by periodically sending sounding packets to each group.Type: GrantFiled: March 4, 2011Date of Patent: September 2, 2014Assignee: Mediatek Inc.Inventors: Thomas E. Pare, Jr., Cheng-Hsuan Wu, Yung-Szu Tu, Kiran Uln, Ravishankar H. Mahadevappa
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Patent number: 8804681Abstract: A method and system utilized in a wireless communication system transmitting and receiving a multi-user packet is disclosed. The communication system includes a transmitter and a plurality of users in communication therewith. The method and system comprise determining a lowest coding scheme for transmitting the packet; and deriving a coding rate for the efficient transmission of the packet from a standard coding rate by de-puncturing bits in the packet. A system and method in accordance with the present invention provides for an efficient utilization of packet length, and improves the reliability by improving SNR, by lowering the MCS, un-puncturing, and/or repetition. More efficient packed data rates are also provided and both Tx and Rx compute parameters independently.Type: GrantFiled: July 1, 2011Date of Patent: August 12, 2014Assignee: Mediatek Inc.Inventors: Kiran Uln, Thomas E. Pare, Jr., Ravishankar H. Mahadevappa
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Patent number: 8457162Abstract: An apparatus for and a method of performing packet detection in a receiver is provided. The apparatus is configured to determine a measure of a correlation between information of one or more received symbols and synchronization information. The apparatus is also configured to determine a measure of an energy value of one or more of the received symbols. The apparatus is also configured to determine if a packet has been detected based on the measure of the correlation and the measure of the energy value of the one or more received symbols.Type: GrantFiled: August 16, 2006Date of Patent: June 4, 2013Assignee: Realtek Semiconductor Corp.Inventors: Turgut Aytur, Stephan ten Brink, Ravishankar H. Mahadevappa, Ran Yan
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Publication number: 20130100943Abstract: Embodiments for processing signals are disclosed. In one embodiment, a method includes providing a plurality of cyclically shifted versions of a known sequence. The method also includes receiving a plurality of delayed versions of a received sequence of a packet. The method also includes correlating the plurality of the delayed versions of the received sequence with the plurality of cyclically shifted versions of the known sequence. The method also includes detecting a preamble of the packet based on the outcome of a described decision statistic computed using the received and known sequences.Type: ApplicationFiled: October 19, 2011Publication date: April 25, 2013Applicant: MEDIATEK SINGAPORE PTE. LTD.Inventor: Ravishankar H. MAHADEVAPPA
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Patent number: 8416870Abstract: An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol.Type: GrantFiled: February 14, 2012Date of Patent: April 9, 2013Assignee: Realtek Semiconductor Corp.Inventors: Turgut Aytur, Stephan ten Brink, Ravishankar H. Mahadevappa, Ran Yan
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Publication number: 20120314594Abstract: Embodiments for improving multi-user downlink reception quality in WLANS are disclosed. In one embodiment, a method includes receiving, at a station, at least one multi-user sounding packet from an access point. The method also includes determining a sum of desired signal strengths from the at least one received sounding packet. The method also includes determining a sum of interference signal strengths from the at least one received sounding packet. The method also includes generating link quality metrics based on a ratio of the sum of desired signal strengths to the sum of interference signal strengths.Type: ApplicationFiled: December 7, 2011Publication date: December 13, 2012Applicant: MEDIATEK SINGAPORE PTE. LTD.Inventors: Ravishankar H. MAHADEVAPPA, Thomas E. PARE, JR., Kiran ULN
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Patent number: 8254480Abstract: An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol.Type: GrantFiled: March 9, 2011Date of Patent: August 28, 2012Assignee: Realtek Semiconductor Corp.Inventors: Turgut Aytur, Stephan ten Brink, Ravishankar H. Mahadevappa, Ran Yan
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Publication number: 20120140794Abstract: An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol.Type: ApplicationFiled: February 14, 2012Publication date: June 7, 2012Inventors: Turgut Aytur, Stephan ten Brink, Ravishankar H. Mahadevappa, Ran Yan
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Publication number: 20120002652Abstract: A method and system utilized in a wireless communication system transmitting and receiving a multi-user packet is disclosed. The communication system includes a transmitter and a plurality of users in communication therewith. The method and system comprise determining a lowest coding scheme for transmitting the packet; and deriving a coding rate for the efficient transmission of the packet from a standard coding rate by de-puncturing bits in the packet. A system and method in accordance with the present invention provides for an efficient utilization of packet length, and improves the reliability by improving SNR, by lowering the MCS, un-puncturing, and/or repetition. More efficient packed data rates are also provided and both Tx and Rx compute parameters independently.Type: ApplicationFiled: July 1, 2011Publication date: January 5, 2012Applicant: Ralink Technology (Singapore) Corporation PTE. LTD.Inventors: Kiran ULN, Thomas E. PARE, JR., Ravishankar H. MAHADEVAPPA
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Publication number: 20120002622Abstract: A method and system utilized in a wireless communication system is disclosed. The communication system includes a transmitter and one or more of stations in communication therewith. The method and system comprise encoding a data assignment of each of the data streams associated with a packet into a plurality of bits, wherein the plurality of bits are within a header of the packet within the transmitter. The method and system also includes decoding the plurality of bits by the one or more stations to allow the one or more stations to obtain the appropriate data stream.Type: ApplicationFiled: July 1, 2011Publication date: January 5, 2012Applicant: Ralink Technology (Singapore) Corporation PTE. LTD.Inventors: Ravishankar H. MAHADEVAPPA, Kiran ULN, Thomas E. PARE, JR.
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Publication number: 20110274003Abstract: A method and system is disclosed for grouping the multiple stations connected to an access point (AP). The system and method comprise sending a sounding packet to a plurality of stations, wherein the stations may be all or part of the stations that are located within the range of the AP. The stations that receive the sounding packets respond to the AP, and the AP determines the channel state information (CSI) from the responses. According to the CSI, the AP divides the multiple stations into several groups. According to an embodiment of the present invention, a confirmation step is performed to each group of stations, respectively. The AP sends a second sounding packet to each group of stations, and verifies the CSI between each station group by group. Therefore, the method and system provides for monitoring the validation of each group by periodically sending sounding packets to each group.Type: ApplicationFiled: March 4, 2011Publication date: November 10, 2011Applicant: Ralink Technology (Singapore) Corporation PTE. LTD.Inventors: Thomas E. PARE, JR., Cheng-Hsuan WU, Yung-Szu TU, Kiran ULN, Ravishankar H. MAHADEVAPPA
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Publication number: 20110274002Abstract: A method and system is disclosed for grouping the multiple stations connected to an access point (AP). The system and method comprise sending a sounding packet to a plurality of stations, wherein the stations may be all or part of the stations that are located within the range of the AP. The stations that receive the sounding packets respond to the AP, and the AP determines the channel state information (CSI) from the responses. According to the CSI, the AP divides the multiple stations into several groups. According to an embodiment of the present invention, a confirmation step is performed to each group of stations, respectively. The AP sends a second sounding packet to each group of stations, and verifies the CSI between each station group by group. Therefore, the method and system provides for monitoring the validation of each group by periodically sending sounding packets to each group.Type: ApplicationFiled: March 4, 2011Publication date: November 10, 2011Applicant: Ralink Technology (Singapore) Corporation PTE. LTDInventors: Thomas E. PARE, JR., Yung-Szu TU, Kiran ULN, Ravishankar H. MAHADEVAPPA
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Patent number: 8014435Abstract: Methods and systems for packet preamble sequences are provided. The preamble sequences are produce by multiplying preestablished base sequences by cover sequences. The cover sequences are chosen for high-performance in multi-band OFDM systems with modes that include two-band hopping.Type: GrantFiled: April 25, 2008Date of Patent: September 6, 2011Assignee: Realtek Semiconductor Corp.Inventors: Stephan ten Brink, Ravishankar H. Mahadevappa, John Coffey
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Patent number: 7986739Abstract: A method and system for detecting the presence of narrowband transmitters utilizing frequencies also utilized by wider band communication systems. In some embodiments an ultrawideband transceiver detects signals at specific frequencies within a spectrum of frequencies, and analyzes the signals to determine if the signals indicate transmissions by a narrowband transmitter in a narrowband communication system. In further embodiments transmission circuitry reduces signal components at frequencies occupied by the narrowband transmitters.Type: GrantFiled: February 25, 2008Date of Patent: July 26, 2011Assignee: Realtek Semiconductor Corp.Inventors: Turgut Aytur, Stephan ten Brink, Ravishankar H. Mahadevappa, Venkatesh Rajendran
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Publication number: 20110158291Abstract: An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol.Type: ApplicationFiled: March 9, 2011Publication date: June 30, 2011Applicant: REALTEK SEMICONDUCTOR CORP.Inventors: Turgut Aytur, Stephan ten Brink, Ravishankar H. Mahadevappa, Ran Yan
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Patent number: 7916798Abstract: An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol.Type: GrantFiled: August 18, 2006Date of Patent: March 29, 2011Assignee: Realtek Semiconductor Corp.Inventors: Turgut Aytur, Stephan ten Brink, Ravishankar H. Mahadevappa, Ran Yan