Patents by Inventor Shuangquan Wang
Shuangquan Wang 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: 9143189Abstract: Disclosed are various embodiments providing selecting various schemes for combining antenna signals for synchronization. For example, processing circuitry determines a first weight for a first antenna based on a signal strength metric of the first antenna and a second weight for a second antenna based on a signal strength metric of the second antenna. The processing circuitry receives a synchronization signal via the first antenna and the second antenna. Then the processing circuitry may weight the synchronization signal received via the first antenna according to the first weight to generate a first weighted synchronization signal and weight the synchronization signal received via the second antenna according to the second weight to generate a second weighted synchronization signal. The processing circuitry further combines the first weighted synchronization signal and the second weighted synchronization signal to generate a combined synchronization signal.Type: GrantFiled: June 19, 2012Date of Patent: September 22, 2015Assignee: BROADCOM CORPORATIONInventor: Shuangquan Wang
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Patent number: 8576959Abstract: A receiver for discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) based systems, including a prefilter for received signal codeword(s); and a log-likelihood ratio LLR module responsive to the prefilter; wherein the prefilter includes a pairing and whitening module that based on channel estimates and data rate enables the LLR module to perform either a Serial-In-Serial-Out (SISO) based log likelihood ratio processing of an output from the paring and whitening module or a two-symbol max-log soft output demodulator (MLSD) based log likelihood ratio processing of an output from the pairing and whitening module.Type: GrantFiled: April 16, 2009Date of Patent: November 5, 2013Assignee: NEC Laboratories America, Inc.Inventors: Narayan Prasad, Xiaodong Wang, Shuangquan Wang
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Patent number: 8565287Abstract: A wireless system may receive a plurality of multipath signals from a plurality of transmitters and allocate per-cell modules for generating an interference suppressed signal from the multipath signals. Data symbols may be sequentially processed in the received multipath signals utilizing the per-cell modules and subtracting the processed symbols from a residual buffer storing the received multipath signals. Desired information received from one or more of the transmitters may be recovered utilizing the interference suppressed signal. Timing of the data symbols may be correlated utilizing a cell chip combiner. The data symbols may be descrambled utilizing conjugated scrambling codes associated with one of the plurality of transmitters. Orthogonal variable spreading factor (OVSF) codes may be generated utilizing a Walsh transform on the data symbols. Power levels of the OVSF codes may be estimated and estimated signals may be generated based on the OVSF codes and the estimated power levels.Type: GrantFiled: October 8, 2009Date of Patent: October 22, 2013Assignee: Broadcom CorporationInventors: Mark Hahm, Wei Luo, Bin Liu, Jun Wu, Severine Catreux-Erceg, Shuangquan Wang
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Publication number: 20130260695Abstract: Disclosed are various embodiments providing selecting various schemes for combining antenna signals for synchronization. For example, processing circuitry determines a first weight for a first antenna based on a signal strength metric of the first antenna and a second weight for a second antenna based on a signal strength metric of the second antenna. The processing circuitry receives a synchronization signal via the first antenna and the second antenna. Then the processing circuitry may weight the synchronization signal received via the first antenna according to the first weight to generate a first weighted synchronization signal and weight the synchronization signal received via the second antenna according to the second weight to generate a second weighted synchronization signal. The processing circuitry further combines the first weighted synchronization signal and the second weighted synchronization signal to generate a combined synchronization signal.Type: ApplicationFiled: June 19, 2012Publication date: October 3, 2013Applicant: BROADCOM CORPORATIONInventor: Shuangquan Wang
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Patent number: 8509698Abstract: Aspects of a method and system for a programmable interference suppression module may include receiving a communication signal comprising one or more desired signal, and one or more undesired signals. The communication signal may be utilized to generate estimated channel state information. The estimated channel state information may be formatted for use in interference suppression. A reduced interference signal may be generated from a delayed version of said communications signal and the estimated channel state information, wherein the one or more undesired signals may be attenuated. The reduced interference signal may be formatted for post-processing. The desired signals may comprise WCDMA and/or HSDPA signals, and the undesired signals may be inter-cell and/or intra-cell interference. Further processing may comprise HSDPA processing and/or RAKE finger processing. The communication signal may be a Universal Mobile Telecommunication System (UMTS) compliant signal.Type: GrantFiled: June 25, 2012Date of Patent: August 13, 2013Assignee: Broadcom CorporationInventors: Mark Hahm, Wei Luo, Thirunathan Sutharsan, Andrew du Preez, Bin Liu, Jun Wu, Severine Catreux-Erceg, Shuangquan Wang
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Patent number: 8503588Abstract: Aspects of a method and system for compensation of interference cancellation delay are provided. In this regard, a wireless communication device may receive one or more signals and may be operable to select, whether dynamically or statically, a processing path for processing the one or more received signals. The selected processing path may comprise one of an interference cancellation processing path and a pass-through processing path. A delay introduced by the pass-through processing path may be approximately equal to a processing delay introduced by the interference cancellation processing path. The one or more received signals may comprise HSDPA signals. The selection of processing path may be based on a measure of interference present in the one or more received signals.Type: GrantFiled: November 3, 2009Date of Patent: August 6, 2013Assignee: Broadcom CorporationInventors: Wei Luo, Karthik Rajagopalan, Andrew du Preez, Bin Liu, Shuangquan Wang
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Publication number: 20120263030Abstract: Aspects of a method and system for a programmable interference suppression module may include receiving a communication signal comprising one or more desired signal, and one or more undesired signals. The communication signal may be utilized to generate estimated channel state information. The estimated channel state information may be formatted for use in interference suppression. A reduced interference signal may be generated from a delayed version of said communications signal and the estimated channel state information, wherein the one or more undesired signals may be attenuated. The reduced interference signal may be formatted for post-processing. The desired signals may comprise WCDMA and/or HSDPA signals, and the undesired signals may be inter-cell and/or intra-cell interference. Further processing may comprise HSDPA processing and/or RAKE finger processing. The communication signal may be a Universal Mobile Telecommunication System (UMTS) compliant signal.Type: ApplicationFiled: June 25, 2012Publication date: October 18, 2012Applicant: Broadcom CorporationInventors: Mark Hahm, Wei Luo, Thirunathan Sutharsan, Andrew du Preez, Bin Liu, Jun Wu, Severine Catreux-Erceg, Shuangquan Wang
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Patent number: 8208856Abstract: Aspects of a method and system for a programmable interference suppression module may include receiving a communication signal comprising one or more desired signal, and one or more undesired signals. The communication signal may be utilized to generate estimated channel state information. The estimated channel state information may be formatted for use in interference suppression. A reduced interference signal may be generated from a delayed version of said communications signal and the estimated channel state information, wherein the one or more undesired signals may be attenuated. The reduced interference signal may be formatted for post-processing. The desired signals may comprise WCDMA and/or HSDPA signals, and the undesired signals may be inter-cell and/or intra-cell interference. Further processing may comprise HSDPA processing and/or RAKE finger processing. The communication signal may be a Universal Mobile Telecommunication System (UMTS) compliant signal.Type: GrantFiled: January 13, 2010Date of Patent: June 26, 2012Assignee: Broadcom CorporationInventors: Mark Hahm, Wei Luo, Thirunathan Sutharsan, Andrew du Preez, Bin Liu, Jun Wu, Severine Catreux-Erceg, Shuangquan Wang
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Patent number: 8023578Abstract: A demodulator and demodulation method includes a bit/symbol hard demodulator configured to obtain hard bit or symbol information from a received signal. At least one lookup table is configured to reference coefficients for computation of log-likelihood ratios (LLRs) from the hard bit or symbol information. A log-likelihood ratio calculation module is configured to compute bit-level LLRs from the coefficients and the received signal.Type: GrantFiled: March 12, 2008Date of Patent: September 20, 2011Assignee: NEC Laboratories America, Inc.Inventors: Shuangquan Wang, Xiaodong Wang, Mohammad Madihian
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Publication number: 20110151888Abstract: Aspects of a method and system for a programmable interference suppression module may include receiving a communication signal comprising one or more desired signal, and one or more undesired signals. The communication signal may be utilized to generate estimated channel state information. The estimated channel state information may be formatted for use in interference suppression. A reduced interference signal may be generated from a delayed version of said communications signal and the estimated channel state information, wherein the one or more undesired signals may be attenuated. The reduced interference signal may be formatted for post-processing. The desired signals may comprise WCDMA and/or HSDPA signals, and the undesired signals may be inter-cell and/or intra-cell interference. Further processing may comprise HSDPA processing and/or RAKE finger processing. The communication signal may be a Universal Mobile Telecommunication System (UMTS) compliant signal.Type: ApplicationFiled: January 13, 2010Publication date: June 23, 2011Inventors: Mark Hahm, Wei Luo, Thirunathan Sutharsan, Andrew du Preez, Bin Liu, Jun Wu, Severine Catreux-Erceg, Shuangquan Wang
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Publication number: 20110103530Abstract: Aspects of a method and system for compensation of interference cancellation delay are provided. In this regard, a wireless communication device may receive one or more signals and may be operable to select, whether dynamically or statically, a processing path for processing the one or more received signals. The selected processing path may comprise one of an interference cancellation processing path and a pass-through processing path. A delay introduced by the pass-through processing path may be approximately equal to a processing delay introduced by the interference cancellation processing path. The one or more received signals may comprise HSDPA signals. The selection of processing path may be based on a measure of interference present in the one or more received signals.Type: ApplicationFiled: November 3, 2009Publication date: May 5, 2011Inventors: Wei Luo, Karthik Rajagopalan, Andrew du Preez, Bin Liu, Shuangquan Wang
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Patent number: 7929563Abstract: Embodiments of methods, devices and/or systems for estimating channel state information are described.Type: GrantFiled: January 20, 2006Date of Patent: April 19, 2011Assignee: New Jersey Institute of TechnologyInventors: Shuangquan Wang, Ali Abdi
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Publication number: 20110075708Abstract: A wireless system may receive a plurality of multipath signals from a plurality of transmitters and allocate per-cell modules for generating an interference suppressed signal from the multipath signals. Data symbols may be sequentially processed in the received multipath signals utilizing the per-cell modules and subtracting the processed symbols from a residual buffer storing the received multipath signals. Desired information received from one or more of the transmitters may be recovered utilizing the interference suppressed signal. Timing of the data symbols may be correlated utilizing a cell chip combiner. The data symbols may be descrambled utilizing conjugated scrambling codes associated with one of the plurality of transmitters. Orthogonal variable spreading factor (OVSF) codes may be generated utilizing a Walsh transform on the data symbols. Power levels of the OVSF codes may be estimated and estimated signals may be generated based on the OVSF codes and the estimated power levels.Type: ApplicationFiled: October 8, 2009Publication date: March 31, 2011Inventors: Mark Hahm, Wei Luo, Bin Liu, Jun Wu, Severine Catreux-Erceg, Shuangquan Wang
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Publication number: 20090262872Abstract: A receiver for discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) based systems, including a prefilter for received signal codeword(s); and a log-likelihood ratio LLR module responsive to the prefilter; wherein the prefilter includes a pairing and whitening module that based on channel estimates and data rate enables the LLR module to perform either a Serial-In-Serial-Out (SISO) based log likelihood ratio processing of an output from the paring and whitening module or a two-symbol max-log soft output demodulator (MLSD) based log likelihood ratio processing of an output from the pairing and whitening module.Type: ApplicationFiled: April 16, 2009Publication date: October 22, 2009Applicant: NEC Laboratories America, Inc.Inventors: Narayan Prasad, Xiaodong Wang, Shuangquan Wang
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Publication number: 20090231028Abstract: A demodulator and demodulation method includes a bit/symbol hard demodulator configured to obtain hard bit or symbol information from a received signal. At least one lookup table is configured to reference coefficients for computation of log-likelihood ratios (LLRs) from the hard bit or symbol information. A log-likelihood ratio calculation module is configured to compute bit-level LLRs from the coefficients and the received signal.Type: ApplicationFiled: March 12, 2008Publication date: September 17, 2009Applicant: NEC LABORATORIES AMERICA, INC.Inventors: SHUANGQUAN WANG, XIAODONG WANG, MOHAMMAD MADIHIAN
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Publication number: 20060274841Abstract: Embodiments of methods, devices and/or systems for estimating channel state information are described.Type: ApplicationFiled: January 20, 2006Publication date: December 7, 2006Inventors: Shuangquan Wang, Ali Abdi