Patents by Inventor Yuejin Huang
Yuejin Huang 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: 7760794Abstract: A method and apparatus for performing joint channel equalization (JCE) are disclosed. JCE is implemented to reject inter-cell and intra-cell interference in a receiver. The JCE only requires the channel responses of a desired signal and interferers with respect to different antennas. In order to implement JCE, a number of discrete Fourier transforms (DFTs) and an inverse discrete Fourier transform (IDFT) are performed and a number of independent linear systems are solved. With M antennas, the JCE is capable of completely rejecting M?1 interferers. Over-sampling with diversity may be used to increase observation dimensions to a certain extent so that a receiver with M antennas may be able to reject more than M?1 interferers.Type: GrantFiled: April 11, 2007Date of Patent: July 20, 2010Assignee: InterDigital Technology CorporationInventors: Yuejin Huang, Rui Yang
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Publication number: 20090225815Abstract: A wireless transmit/receive unit (WTRU) is configure to receive and sample wireless signals in a shared spectrum where the wireless signal comprise encoded symbols. The WTRU has a channel estimation device configured to process received signal samples to produce an estimate of a channel response of the received signals corresponding to a matrix H. The channel estimation device is preferably configured to process the received signal samples to produce an estimate of noise variance of the received signals. The WTRU preferably has a two stage data estimator that includes a channel equalizer and a despreader. The channel equalizer is configured to process received signal samples using the estimated channel response matrix H and the estimate of noise variance to produce a spread signal estimate of the received signals. The despreader is configured to process the spread signal estimate of the received signals produced by said channel equalizer to recover encoded symbols of the received signals.Type: ApplicationFiled: May 19, 2009Publication date: September 10, 2009Applicant: INTERDIGITAL TECHNOLOGY CORPORATIONInventors: Jung-Lin Pan, Yuejin Huang, Donald M. Grieco
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Patent number: 7545851Abstract: A wireless transmit/receive unit (WTRU) is configure to receive and sample wireless signals in a shared spectrum where the wireless signal comprise encoded symbols. The WTRU has a channel estimation device configured to process received signal samples to produce an estimate of a channel response of the received signals corresponding to a matrix H. The channel estimation device is preferably configured to process the received signal samples to produce an estimate of noise variance of the received signals. The WTRU preferably has a two stage data estimator that includes a channel equalizer and a despreader. The channel equalizer is configured to process received signal samples using the estimated channel response matrix H and the estimate of noise variance to produce a spread signal estimate of the received signals. The despreader is configured to process the spread signal estimate of the received signals produced by said channel equalizer to recover encoded symbols of the received signals.Type: GrantFiled: June 9, 2008Date of Patent: June 9, 2009Assignee: InterDigital Technology CorporationInventors: Jung-Lin Pan, Yuejin Huang, Donald M. Grieco
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Patent number: 7539238Abstract: A method of data estimation for a Time Division Duplex (TDD) Code Division Multiple Access (CDMA) system or any other system using an extended algorithm (EA) in preference to a truncated algorithm (TA). The EA avoids implementation errors by choice of proper extended matrices, and accepts the use of one piece of hardware. The EA also obviates loss of multiple signals in the tail part of each data field, and avoids errors due to transformation of a Toeplitz matrix to a circulant matrix.Type: GrantFiled: July 15, 2008Date of Patent: May 26, 2009Assignee: InterDigital Patent Holdings, Inc.Inventors: Jung-Lin Pan, Yuejin Huang, Ariela Zeira
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Publication number: 20090129499Abstract: The present invention is related to a method and apparatus for implementing space frequency block coding (SFBC) in an orthogonal frequency division multiplexing (OFDM) wireless communication system. The present invention is applicable to both a closed loop mode and an open loop mode. In the closed loop mode, power loading and eigen-beamforming are performed based on channel state information (CSI). A channel coded data stream is multiplexed into two or more data streams. Power loading is performed based on the CSI on each of the multiplexed data streams. SFBC encoding is performed on the data streams for each of the paired subcarriers. Then, eigen-beamforming is performed based on the CSI to distribute eigenbeams to multiple transmit antennas. The power loading may be performed on two or more SFBC encoding blocks or on each eigenmodes. Additionally, the power loading may be performed across subcarriers or subcarrier groups for weak eigenmodes.Type: ApplicationFiled: January 27, 2009Publication date: May 21, 2009Applicant: INTERDIGITAL TECHNOLOGY CORPORATIONInventors: Jaeyoung Kwak, Robert Lind Olesen, Aykut Bultan, Eldad Zeira, Chang-Soo Koo, Fatih Ozluturk, Yuejin Huang, Kalpendu R. Pasad
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Patent number: 7505529Abstract: The present invention is related to a method and apparatus for implementing space frequency block coding (SFBC) in an orthogonal frequency division multiplexing (OFDM) wireless communication system. The present invention is applicable to both a closed loop mode and an open loop mode. In the closed loop mode, power loading and eigen-beamforming are performed based on channel state information (CSI). A channel coded data stream is multiplexed into two or more data streams. Power loading is performed based on the CSI on each of the multiplexed data streams. SFBC encoding is performed on the data streams for each of the paired subcarriers. Then, eigen-beamforming is performed based on the CSI to distribute eigenbeams to multiple transmit antennas. The power loading may be performed on two or more SFBC encoding blocks or on each eigenmodes. Additionally, the power loading may be performed across subcarriers or subcarrier groups for weak eigenmodes.Type: GrantFiled: August 11, 2005Date of Patent: March 17, 2009Assignee: InterDigital Technology CorporationInventors: Jaeyoung Kwak, Robert Lind Olesen, Aykut Bultan, Eldad Zeira, Chang-Soo Koo, Fatih Ozluturk, Yuejin Huang, Kalpendu R. Pasad
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Publication number: 20080267321Abstract: A method of data estimation for a Time Division Duplex (TDD) Code Division Multiple Access (CDMA) system or any other system using an extended algorithm (EA) in preference to a truncated algorithm (TA). The EA avoids implementation errors by choice of proper extended matrices, and accepts the use of one piece of hardware. The EA also obviates loss of multiple signals in the tail part of each data field, and avoids errors due to transformation of a Toeplitz matrix to a circulant matrix.Type: ApplicationFiled: July 15, 2008Publication date: October 30, 2008Applicant: INTERDIGITAL PATENT HOLDINGS, INC.Inventors: Jung-Lin Pan, Yuejin Huang, Ariela Zeira
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Publication number: 20080240302Abstract: A wireless transmit/receive unit (WTRU) is configure to receive and sample wireless signals in a shared spectrum where the wireless signal comprise encoded symbols. The WTRU has a channel estimation device configured to process received signal samples to produce an estimate of a channel response of the received signals corresponding to a matrix H. The channel estimation device is preferably configured to process the received signal samples to produce an estimate of noise variance of the received signals. The WTRU preferably has a two stage data estimator that includes a channel equalizer and a despreader. The channel equalizer is configured to process received signal samples using the estimated channel response matrix H and the estimate of noise variance to produce a spread signal estimate of the received signals. The despreader is configured to process the spread signal estimate of the received signals produced by said channel equalizer to recover encoded symbols of the received signals.Type: ApplicationFiled: June 9, 2008Publication date: October 2, 2008Applicant: INTERDIGITAL TECHNOLOGY CORPORATIONInventors: Jung-Lin Pan, Yuejin Huang, Donald M. Grieco
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Patent number: 7408978Abstract: A method of data estimation for a Time Division Duplex (TDD) Code Division Multiple Access (CDMA) system or any other system using an extended algorithm (EA) in preference to a truncated algorithm (TA). The EA avoids implementation errors by choice of proper extended matrices, and accepts the use of one piece of hardware. The EA also obviates loss of multiple signals in the tail part of each data field, and avoids errors due to transformation of a Toeplitz matrix to a circulant matrix.Type: GrantFiled: September 8, 2003Date of Patent: August 5, 2008Assignee: InterDigital Technology CorporationInventors: Jung-Lin Pan, Yuejin Huang, Ariela Zeira
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Patent number: 7406130Abstract: The present invention is related to a method and system for optimization of channel estimation and synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) Multiple-Input Multiple-Output (MIMO) wireless communication system. In accordance with the present invention, all of the training sequences are simply constructed based on a basic code by cyclically shifting the basic code. The training sequences are transmitted from different antennas in parallel without performing inverse fast Fourier transform. As a result, there is no peak-to-average ratio problem. Channel estimation is performed in each receiver based on the samples before fast Fourier transform and the maximum-likelihood estimate of channel response in time domain is then mapped into the frequency domain. The channel estimation is not only very simple in implementation, but also very efficient in computation.Type: GrantFiled: September 20, 2006Date of Patent: July 29, 2008Assignee: InterDigital Technology CorporationInventors: Yuejin Huang, Robert Lind Olesen, Chang-Soo Koo
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Patent number: 7386033Abstract: A wireless transmit/receive unit (WTRU) is configure to receive and sample wireless signals in a shared spectrum where the wireless signal comprise encoded symbols. The WTRU has a channel estimation device configured to process received signal samples to produce an estimate of a channel response of the received signals corresponding to a matrix H. The channel estimation device is preferably configured to process the received signal samples to produce an estimate of noise variance of the received signals. The WTRU has a two stage data estimator that includes a channel equalizer and a despreader. The channel equalizer is configured to process received signal samples using the estimated channel response matrix H and the estimate of noise variance to produce a spread signal estimate of the received signals. The despreader is configured to process the spread signal estimate of the received signals produced by said channel equalizer to recover encoded symbols of the received signals.Type: GrantFiled: June 20, 2006Date of Patent: June 10, 2008Assignee: Interdigital Technology CorporationInventors: Jung-Lin Pan, Yuejin Huang, Donald M. Grieco
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Publication number: 20070242767Abstract: A method and apparatus for performing joint channel equalization (JCE) are disclosed. JCE is implemented to reject inter-cell and intra-cell interference in a receiver. The JCE only requires the channel responses of a desired signal and interferers with respect to different antennas. In order to implement JCE, a number of discrete Fourier transforms (DFTs) and an inverse discrete Fourier transform (IDFT) are performed and a number of independent linear systems are solved. With M antennas, the JCE is capable of completely rejecting M?1 interferers. Over-sampling with diversity may be used to increase observation dimensions to a certain extent so that a receiver with M antennas may be able to reject more than M?1 interferers.Type: ApplicationFiled: April 11, 2007Publication date: October 18, 2007Applicant: INTERDIGITAL TECHNOLOGY CORPORATIONInventors: Yuejin Huang, Rui Yang
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Publication number: 20070014376Abstract: The present invention is related to a method and system for optimization of channel estimation and synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) Multiple-Input Multiple-Output (MIMO) wireless communication system. In accordance with the present invention, all of the training sequences are simply constructed based on a basic code by cyclically shifting the basic code. The training sequences are transmitted from different antennas in parallel without performing inverse fast Fourier transform. As a result, there is no peak-to-average ratio problem. Channel estimation is performed in each receiver based on the samples before fast Fourier transform and the maximum-likelihood estimate of channel response in time domain is then mapped into the frequency domain. The channel estimation is not only very simple in implementation, but also very efficient in computation.Type: ApplicationFiled: September 20, 2006Publication date: January 18, 2007Applicant: InterDigital Technology CorporationInventors: Yuejin Huang, Robert Olesen, Chang-Soo Koo
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Publication number: 20060233223Abstract: A wireless transmit/receive unit (WTRU) is configure to receive and sample wireless signals in a shared spectrum where the wireless signal comprise encoded symbols. The WTRU has a channel estimation device configured to process received signal samples to produce an estimate of a channel response of the received signals corresponding to a matrix H. The channel estimation device is preferably configured to process the received signal samples to produce an estimate of noise variance of the received signals. The WTRU has a two stage data estimator that includes a channel equalizer and a despreader. The channel equalizer is configured to process received signal samples using the estimated channel response matrix H and the estimate of noise variance to produce a spread signal estimate of the received signals. The despreader is configured to process the spread signal estimate of the received signals produced by said channel equalizer to recover encoded symbols of the received signals.Type: ApplicationFiled: June 20, 2006Publication date: October 19, 2006Applicant: InterDigital Technology CorporationInventors: Jung-Lin Pan, Yuejin Huang, Donald Grieco
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Patent number: 7120201Abstract: The present invention is related to a method and system for optimization of channel estimation and synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) Multiple-Input Multiple-Output (MIMO) wireless communication system. In accordance with the present invention, all of the training sequences are simply constructed based on a basic code by cyclically shifting the basic code. The training sequences are transmitted from different antennas in parallel without performing inverse fast Fourier transform. As a result, there is no peak-to-average ratio problem. Channel estimation is performed in each receiver based on the samples before fast Fourier transform and the maximum-likelihood estimate of channel response in time domain is then mapped into the frequency domain. The channel estimation is not only very simple in implementation, but also very efficient in computation.Type: GrantFiled: September 8, 2005Date of Patent: October 10, 2006Assignee: InterDigital Technology CorporationInventors: Yuejin Huang, Robert Lind Olesen, Chang-Soo Koo
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Patent number: 7079570Abstract: A wireless communication system comprises first and second communication stations which send and receive symbols in signals in a shared spectrum. The symbols are recovered from the received signals. Codes of the signals are processed using a block Fourier transform (FT), producing a code block diagonal matrix. A channel response matrix is estimated. The channel response matrix is extended and modified to produce a block circulant matrix, and a block FT is taken producing a channel response block diagonal matrix. The code block diagonal matrix is combined with the channel response block diagonal matrix. The received signals are sampled and processed using the combined code block diagonal matrix and channel response block diagonal matrix with a Cholesky algorithm. A block inverse FT is performed on a result of the Cholesky algorithm to produce spread symbols. The spread symbols are despread to recover symbols of the received signals.Type: GrantFiled: May 26, 2005Date of Patent: July 18, 2006Assignee: InterDigital Technology CorporationInventors: Jung-Lin Pan, Yuejin Huang, Donald M. Grieco
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Publication number: 20060072677Abstract: The present invention is related to a method and apparatus for implementing space frequency block coding (SFBC) in an orthogonal frequency division multiplexing (OFDM) wireless communication system. The present invention is applicable to both a closed loop mode and an open loop mode. In the closed loop mode, power loading and eigen-beamforming are performed based on channel state information (CSI). A channel coded data stream is multiplexed into two or more data streams. Power loading is performed based on the CSI on each of the multiplexed data streams. SFBC encoding is performed on the data streams for each of the paired subcarriers. Then, eigen-beamforming is performed based on the CSI to distribute eigenbeams to multiple transmit antennas. The power loading may be performed on two or more SFBC encoding blocks or on each eigenmodes. Additionally, the power loading may be performed across subcarriers or subcarrier groups for weak eigenmodes.Type: ApplicationFiled: August 11, 2005Publication date: April 6, 2006Applicant: InterDigital Technology CorporationInventors: Jaeyoung Kwak, Robert Olesen, Aykut Bultan, Eldad Zeira, Chang-Soo Koo, Fatih Ozluturk, Yuejin Huang, Kalpendu Pasad
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Publication number: 20060056529Abstract: The present invention is related to a method and system for optimization of channel estimation and synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) Multiple-Input Multiple-Output (MIMO) wireless communication system. In accordance with the present invention, all of the training sequences are simply constructed based on a basic code by cyclically shifting the basic code. The training sequences are transmitted from different antennas in parallel without performing inverse fast Fourier transform. As a result, there is no peak-to-average ratio problem. Channel estimation is performed in each receiver based on the samples before fast Fourier transform and the maximum-likelihood estimate of channel response in time domain is then mapped into the frequency domain. The channel estimation is not only very simple in implementation, but also very efficient in computation.Type: ApplicationFiled: September 8, 2005Publication date: March 16, 2006Applicant: InterDigital Technology CorporationInventors: Yuejin Huang, Robert Olesen, Chang-Soo Koo
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Publication number: 20060034244Abstract: A method and system for link adaptation in an orthogonal frequency division multiplexing (OFDM) wireless communication system are disclosed. The entire sub-channels are divided into a plurality of groups. A channel quality indicator (CQI) is generated for each group based on channel quality status in each group, and communication parameters are adjusted in accordance with the CQI.Type: ApplicationFiled: May 6, 2005Publication date: February 16, 2006Applicant: InterDigital Technology CorporationInventors: Yuejin Huang, Chang-Soo Koo, Robert Olesen, Guodong Zhang, Yingming Tsai
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Publication number: 20050213640Abstract: A wireless communication system comprises first and second communication stations which send and receive symbols in signals in a shared spectrum. The symbols are recovered from the received signals. Codes of the signals are processed using a block Fourier transform (FT), producing a code block diagonal matrix. A channel response matrix is estimated. The channel response matrix is extended and modified to produce a block circulant matrix, and a block FT is taken producing a channel response block diagonal matrix. The code block diagonal matrix is combined with the channel response block diagonal matrix. The received signals are sampled and processed using the combined code block diagonal matrix and channel response block diagonal matrix with a Cholesky algorithm. A block inverse FT is performed on a result of the Cholesky algorithm to produce spread symbols. The spread symbols are despread to recover symbols of the received signals.Type: ApplicationFiled: May 26, 2005Publication date: September 29, 2005Applicant: InterDigital Technology CorporationInventors: Jung-Lin Pan, Yuejin Huang, Donald Grieco