Patents by Inventor Pandharipande Ashish
Pandharipande Ashish 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: 8045655Abstract: An apparatus and method for signal detection in a CR-based wireless communication system are provided. In the signal detection apparatus, a cyclic power calculator calculates the power spectral density of a cyclo-stationary and periodical signal to be detected with respect to a cyclic frequency and calculates optimum statistics using the power spectral density. A signal detector determines whether a signal exists or not according to the optimum statistics.Type: GrantFiled: November 3, 2006Date of Patent: October 25, 2011Assignee: Samsung Electronics Co., Ltd.Inventor: Pandharipande Ashish
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Patent number: 8005480Abstract: A communication initialization method at a MAC layer in a CR wireless communication system is provided. The use or non-use of a frequency band is sensed over a broadband with a minimized sensing time in a non-interfering manner with existing communication systems.Type: GrantFiled: November 3, 2006Date of Patent: August 23, 2011Assignees: Samsung Electronics Co., Ltd., Inha-Industry Partnership InstituteInventors: Pandharipande Ashish, Duck-Dong Hwang, Jae-Myeong Kim, Sang-Jo Yoo, Chang-Gun Seo, Jae-Hak Chung
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Patent number: 7912470Abstract: A method of partitioning resources in a CR wireless communication system and a system supporting the same are provided. A new BS receives radio resource status information from a prior BS using a particular frequency band, and requests resource partitioning to the prior BS using a new uplink subchannel defined for communications between BSs. Resource negotiation messages are exchanged over a channel defined between the two BSs so as to efficiently partition resources between the BSs.Type: GrantFiled: November 6, 2006Date of Patent: March 22, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Pandharipande Ashish, Duck-Dong Hwang, Jae-Myeong Kim, Sang-Jo Yoo, Kyoung-Jin Cho, Jae-Hak Chung
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Patent number: 7835478Abstract: Disclosed are an analog-to-digital conversion method and apparatus capable of reducing quantization distortion in a receiver supporting multi-standard radios for which digital signal processing must be differently performed. The analog-to-digital conversion apparatus includes a first filter for filtering an input analog signal into a plurality of sub-band signals, a down-sampler for down-sampling the sub-band signals, a sub-band processor for allocating quantization bits for the sub-band signals, respectively, and digitizing the sub-band signals by using the allocated quantization bits, an up-sampler for up-sampling the digitized sub-band signals, and a second filter for reconstructing the sub-band signals into one digital signal. Multi-standard radio signals can be processed into digital signals in a receiver to which SDR is applied, and quantization distortion can be reduced during a procedure of converting the radio signal into the digital signal.Type: GrantFiled: November 3, 2006Date of Patent: November 16, 2010Assignee: Samsung Electronics Co., Ltd.Inventor: Pandharipande Ashish
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Patent number: 7778147Abstract: A multiple-input multiple-output (MIMO) wireless communication system. A transmitter that includes a plurality of transmit antennas selects one of a spatial multiplexing scheme and a spatial diversity scheme, processes a signal in the selected transmission scheme, and transmits the signal through the plurality of transmit antennas. A receiver that includes a plurality of receive antennas processes a signal in a reception scheme mapped to a transmission scheme of the transmitter. The transmission schemes include a transmission scheme for maximizing diversity gain and a transmission scheme for maximizing spectral efficiency. The MIMO communication system using an adaptive transmission mode switching technique performs switching between MIMO transmission modes using spatial selectivity of a channel, thereby obtaining maximum gain in a signal to noise ratio (SNR) and spectral efficiency according to channel state.Type: GrantFiled: September 7, 2005Date of Patent: August 17, 2010Assignees: Samsung Electronics Co., Ltd., Board of Regents, The University of Texas SystemInventors: Antonio Forenza, Robert W. Heath, Hyoung-Woon Park, Ho Yang, Ho-Jin Kim, Marios Kountouris, Pandharipande Ashish
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Patent number: 7680198Abstract: A bit/power loading method in an adaptive modulation-based multicarrier communication system computes ratios of modulation mode values to transmission power values sub-channel-by-sub-channel, selects a combination of sub-channels in which a sum of the ratios is maximized for a total number of bits to be simultaneously transmitted, and transmits signals in modulation modes corresponding to ratios of modulation mode values to transmission power values associated with the selected sub-channels. Because the bit/power loading method selects a combination of sub-channel modulation modes with the minimum total transmission power for a given number of bits on the basis of transmission power in each sub-channel modulation mode, the bits can be transmitted at the minimum transmission power in a given environment.Type: GrantFiled: March 24, 2005Date of Patent: March 16, 2010Assignee: Samsung Electronics Co., Ltd.Inventors: Pandharipande Ashish, Ho Yang, Hyoung-Woon Park, Ho-Jin Kim, Young-Ho Jung
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Patent number: 7675988Abstract: An apparatus and method for performing beamforming or transmitting a plurality of bit streams output through Adaptive Modulation and Coding (AMC) via a plurality of transmission antennas in a base station using a multi-antenna scheme. The apparatus and method include classifying the plurality of transmission antennas into a plurality of transmission antenna groups; selecting one of the transmission antenna groups depending on a group selection signal being fed back from a mobile station; and outputting each of the bit streams to its associated transmission antenna among the transmission antennas constituting the selected transmission antenna group.Type: GrantFiled: July 13, 2005Date of Patent: March 9, 2010Assignees: Samsung Electronics Co., Ltd, Seoul National University Industry FoundationInventors: Ho-Jin Kim, Ju-Ho Lee, Kwang-Bok Lee, Hyoung-Woon Park, Ho Yang, Pandharipande Ashish, Sung-Jin Kim
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Publication number: 20070115878Abstract: A method of partitioning resources in a CR wireless communication system and a system supporting the same are provided. A new BS receives radio resource status information from a prior BS using a particular frequency band, and requests resource partitioning to the prior BS using a new uplink subchannel defined for communications between BSs. Resource negotiation messages are exchanged over a channel defined between the two BSs so as to efficiently partition resources between the BSs.Type: ApplicationFiled: November 6, 2006Publication date: May 24, 2007Applicant: Samsung Electronics Co., Ltd.Inventors: Pandharipande Ashish, Duck-Dong Hwang, Jae-Myeong Kim, Sang-Jo Yoo, Kyoung-Jin Cho, Jae-Hak Chung
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Publication number: 20070104140Abstract: A communication initialization method at a MAC layer in a CR wireless communication system is provided. The use or non-use of a frequency band is sensed over a broadband with a minimized sensing time in a non-interfering manner with existing communication systems.Type: ApplicationFiled: November 3, 2006Publication date: May 10, 2007Applicants: Samsung Electronics Co., Ltd., Inha-Industry Partnership InstituteInventors: Pandharipande Ashish, Duck-Dong Hwang, Jae-Myeong Kim, Sang-Jo Yoo, Chang-Gun Seo, Jae-Hak Chung
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Publication number: 20070100922Abstract: An apparatus and method for signal detection in a CR-based wireless communication system are provided. In the signal detection apparatus, a cyclic power calculator calculates the power spectral density of a cyclo-stationary and periodical signal to be detected with respect to a cyclic frequency and calculates optimum statistics using the power spectral density. A signal detector determines whether a signal exists or not according to the optimum statistics.Type: ApplicationFiled: November 3, 2006Publication date: May 3, 2007Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventor: Pandharipande Ashish
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Publication number: 20070098065Abstract: Disclosed are an analog-to-digital conversion method and apparatus capable of reducing quantization distortion in a receiver supporting multi-standard radios for which digital signal processing must be differently performed. The analog-to-digital conversion apparatus includes a first filter for filtering an input analog signal into a plurality of sub-band signals, a down-sampler for down-sampling the sub-band signals, a sub-band processor for allocating quantization bits for the sub-band signals, respectively, and digitizing the sub-band signals by using the allocated quantization bits, an up-sampler for up-sampling the digitized sub-band signals, and a second filter for reconstructing the sub-band signals into one digital signal. Multi-standard radio signals can be processed into digital signals in a receiver to which SDR is applied, and quantization distortion can be reduced during a procedure of converting the radio signal into the digital signal.Type: ApplicationFiled: November 3, 2006Publication date: May 3, 2007Applicant: Samsung Electronics Co., Ltd.Inventor: Pandharipande Ashish
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Publication number: 20060083195Abstract: A multiple-input multiple-output (MIMO) wireless communication system. A transmitter that includes a plurality of transmit antennas selects one of a spatial multiplexing scheme and a spatial diversity scheme, processes a signal in the selected transmission scheme, and transmits the signal through the plurality of transmit antennas. A receiver that includes a plurality of receive antennas processes a signal in a reception scheme mapped to a transmission scheme of the transmitter. The transmission schemes include a transmission scheme for maximizing diversity gain and a transmission scheme for maximizing spectral efficiency. The MIMO communication system using an adaptive transmission mode switching technique performs switching between MIMO transmission modes using spatial selectivity of a channel, thereby obtaining maximum gain in a signal to noise ratio (SNR) and spectral efficiency according to channel state.Type: ApplicationFiled: September 7, 2005Publication date: April 20, 2006Applicants: SAMSUNG ELECTRONICS CO., LTD., BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEMInventors: Antonio Forenza, Robert Heath, Hyoung-Woon Park, Ho Yang, Ho-Jin Kim, Marios Kountouris, Pandharipande Ashish
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Publication number: 20060056527Abstract: A bit/power loading method in an adaptive modulation-based multicarrier communication system computes ratios of modulation mode values to transmission power values sub-channel-by-sub-channel, selects a combination of sub-channels in which a sum of the ratios is maximized for a total number of bits to be simultaneously transmitted, and transmits signals in modulation modes corresponding to ratios of modulation mode values to transmission power values associated with the selected sub-channels. Because the bit/power loading method selects a combination of sub-channel modulation modes with the minimum total transmission power for a given number of bits on the basis of transmission power in each sub-channel modulation mode, the bits can be transmitted at the minimum transmission power in a given environment.Type: ApplicationFiled: March 24, 2005Publication date: March 16, 2006Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Pandharipande Ashish, Ho Yang, Hyoung-Woon Park, Ho-Jin Kim, Young-Ho Jung
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Publication number: 20060039494Abstract: An apparatus and method for performing beamforming for transmitting a plurality of bit streams output through Adaptive Modulation and Coding (AMC) via a plurality of transmission antennas in a base station using a multi-antenna scheme. The apparatus and method include classifying the plurality of transmission antennas into a plurality of transmission antenna groups; selecting one of the transmission antenna groups depending on a group selection signal being fed back from a mobile station; and outputting each of the bit streams to its associated transmission antenna among the transmission antennas constituting the selected transmission antenna group.Type: ApplicationFiled: July 13, 2005Publication date: February 23, 2006Applicants: SAMSUNG ELECTRONICS CO., LTD., Seoul National University Industry FoundationInventors: Ho-Jin Kim, Ju-Ho Lee, Kwang-Bok Lee, Hyoung-Woon Park, Ho Yang, Pandharipande Ashish, Sung-Jin Kim