Patents by Inventor Wanlun Zhao
Wanlun Zhao 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: 8744018Abstract: Certain embodiments provide methods that may allow for improvements in performance and power consumption by terminating the turbo decoding process early when one of at least two test criterion is satisfied in communications systems, including UMTS, WCDMA, and TD-DCMA.Type: GrantFiled: April 5, 2012Date of Patent: June 3, 2014Assignee: QUALCOMM IncorporatedInventors: Jinghu Chen, Wanlun Zhao, Mingxi Fan, Fuyun Ling, Peter John Black
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Publication number: 20140133319Abstract: In a TD-SCDMA user equipment (UE) with multiple receive chains, receive diversity may be implemented where multiple receive chains may simultaneously activate to perform reception on downlink signals. Receive diversity may be enabled when single chain reception provides undesired results and when receive diversity will not impact power consumption too much. A state machine may be implemented to control receive diversity operation based on operating conditions such as an error rate, signal-to-interference ratio, and other factors.Type: ApplicationFiled: November 13, 2012Publication date: May 15, 2014Applicant: QUALCOM IncorporatedInventors: Jinghu Chen, Qiang Shen, Jilei Hou, Wanlun Zhao, Insung Kang
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Publication number: 20140112267Abstract: In a TD-SCDMA user equipment (UE) with multiple receive chains, receive diversity may be implemented where multiple receive chains may simultaneously activate to receive downlink signals. Receive diversity may be enabled when single chain reception provides undesired results and when receive diversity will not impact power consumption too much. A state machine controls receive diversity operation based on operating conditions such as control channel activity, successful control channel decoding, signal-to-interference ratio, and other factors.Type: ApplicationFiled: October 9, 2013Publication date: April 24, 2014Applicant: QUALCOMM IncorporatedInventors: Jinghu CHEN, Qiang SHEN, Jilei HOU, Wanlun ZHAO, Insung KANG
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Publication number: 20140053049Abstract: The present disclosure describes methods and apparatuses for improved transport block decoding in devices capable of wireless communication, which may include user equipment and network entities. For example, the present disclosure presents methods and apparatuses for decoding a code block from a plurality of code blocks corresponding to a transport block, obtaining a reliability indicator that identifies a reliability of the decoding of the code block, comparing the reliability indicator to a reliability threshold, and determining whether to decode a subsequent code block from the plurality of code blocks based on the comparing. Furthermore, these methods and apparatuses may include determining not to decode at least one subsequent code block of the transport block where the comparing indicates that the reliability indicator is less than the reliability threshold. As such, device power is not unnecessarily consumed by decoding likely superfluous code blocks.Type: ApplicationFiled: August 20, 2012Publication date: February 20, 2014Applicant: QUALCOMM IncorporatedInventors: Jinghu CHEN, Wanlun Zhao, Michael Mingxi Fan, Fuyun Ling, Peter John Black, Krishna Kiran Mukkavilli, Weihong Jing, Jia Tang
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Publication number: 20140036698Abstract: A method of wireless communication includes receiving a wireless signal at a linear receiver, and iteratively computing an inverted covariance matrix in frequency domain, one channel code at a time. The method also includes computing receiver demodulation coefficients based on the inverted covariance matrix and the frequency domain channel estimate or time domain channel estimate. The method further includes deriving a transmitter symbol based on a received signal vector and the coefficients.Type: ApplicationFiled: August 2, 2012Publication date: February 6, 2014Applicant: QUALCOMM IncorporatedInventors: Wanlun Zhao, Fuyun Ling, Mingxi Fan, Jinghu Chen
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Publication number: 20140038645Abstract: Briefly, in accordance with one embodiment, a method of adjusting for digital automatic gain control (DAGC) quantization error in a mobile station is as follows. A first DAGC value is stored before reception of one or more enhanced pilot signals. A second DAGC value is computed during reception of the one or more enhanced pilot signal. The first DAGC value is restored after reception of the one or more enhanced pilot signals is over. An advantage associated with this particular embodiment may include reduction in quantization error for digital automatic gain control.Type: ApplicationFiled: July 25, 2013Publication date: February 6, 2014Applicant: QUALCOMM IncorporatedInventors: Qiang Wu, Wanlun Zhao, Peter John Black
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Publication number: 20140029705Abstract: Briefly, in accordance with one embodiment, a method of adjusting for digital automatic gain control (DAGC) quantization error in a mobile station is as follows. A first DAGC value is stored before reception of one or more enhanced pilot signals. A second DAGC value is computed during reception of the one or more enhanced pilot signal. The first DAGC value is restored after reception of the one or more enhanced pilot signals is over. An advantage associated with this particular embodiment may include reduction in quantization error for digital automatic gain control.Type: ApplicationFiled: July 17, 2013Publication date: January 30, 2014Applicant: QUALCOMM IncorporatedInventors: Qiang Wu, Wanlun Zhao, Peter John Black
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Publication number: 20130266097Abstract: Certain embodiments provide methods that may allow for improvements in performance and power consumption by terminating the turbo decoding process early when one of at least two test criterion is satisfied in communications systems, including UMTS, WCDMA, and TD-DCMA.Type: ApplicationFiled: April 5, 2012Publication date: October 10, 2013Applicant: QUALCOMM IncorporatedInventors: Jinghu Chen, Wanlun Zhao, Mingxi Fan, Fuyun Ling, Peter John Black
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Publication number: 20130229961Abstract: Apparatus and methods are disclosed for positioning an access terminal in a CDMA wireless communication network utilizing a highly detectable pilot (HDP) scheme. Here, transmissions by base stations are divided in the time dimension into a plurality of time slots, or pilot control groups (PCGs). A subset of these time slots, according to a duty cycle, are exclusively allocated to the transmission of the HDP signals, while conventional data, control, and pilot transmissions are forgone during these HDP time slots. Among the HDP time slots, in accordance with a re-use pattern, groups of the cells take turns transmitting the HDPs at full base station power. In this way, access terminals are better capable of receiving a greater set of pilot signals for utilization in trilateration of the access terminals. Other aspects, embodiments, and features are also claimed and described.Type: ApplicationFiled: August 30, 2012Publication date: September 5, 2013Applicant: Qualcomm IncorporatedInventors: Jun Ma, Wanlun Zhao, Rashid Ahmed Akbar Attar
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Patent number: 8514988Abstract: Briefly, in accordance with one embodiment, a method of adjusting for digital automatic gain control (DAGC) quantization error in a mobile station is as follows. A first DAGC value is stored before reception of one or more enhanced pilot signals. A second DAGC value is computed during reception of the one or more enhanced pilot signal. The first DAGC value is restored after reception of the one or more enhanced pilot signals is over. An advantage associated with this particular embodiment may include reduction in quantization error for digital automatic gain control.Type: GrantFiled: May 1, 2008Date of Patent: August 20, 2013Assignee: QUALCOMM IncorporatedInventors: Qiang Wu, Wanlun Zhao, Peter John Black
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Patent number: 8412227Abstract: Briefly, in accordance with one embodiment, a method of transmitting signals is provided. Signal waveforms are transmitted from at least two respective sectors. The at least two respective sectors are from at least two different sets of a superset of sectors. The transmitted signal waveforms include signal waveforms at least nearly mutually orthogonal at least along a particular signal dimension. An advantage of such an embodiment, for example, is reduced signal interference.Type: GrantFiled: October 27, 2008Date of Patent: April 2, 2013Assignee: QUALCOMM IncorporatedInventors: Stephen W. Edge, Peter John Black, Qiang Wu, Wanlun Zhao, Yeliz Tokgoz, Roberto Padovani, Ayman Fawzy Naguib, Je Woo Kim, Pranav Dayal, Parag Arun Agashe
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Publication number: 20130003817Abstract: An improved receiver apparatus and algorithm for equalizing signals in a receiver device may equalize a block of data generated from N data symbols in a single carrier communication system. A first algorithm may be applied to a plurality of signal samples to generate a frequency domain representation of the samples. A channel estimate may be generated and a frequency response of a zero-forcing or a minimum-mean-square equalizer is applied. A conjugate of the computed frequency response is multiplied with a frequency domain representation for each sample to generate a product value. N-aliased frequency domain values from the generated product value may be determined for each of the samples. A second algorithm is applied to the generated N-aliased frequency domain values to generate estimates of the transmitted time domain data symbols.Type: ApplicationFiled: June 28, 2011Publication date: January 3, 2013Applicant: QUALCOMM IncorporatedInventors: Fuyun Ling, Wanlun Zhao
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Publication number: 20120127870Abstract: A method and apparatus for enabling an enhanced FDE in a TD-SCDMA system is provided. The method may comprise receiving one or more signals from one or more cells over one or more channels where each channel is described using a channel vector and a spreading vector, and where each signal includes one or more data blocks each including a number of symbols, converting the one or more received signals from a time domain into a frequency domain using a block FFT, inverting a covariance matrix, wherein the covariance matrix is derived from a linear convolution of the one or more channel vectors and the one or more spreading vectors, and determining one or more MMSE signals by manipulating the frequency domain one or more received signals by applying the inverted equivalent channel matrix.Type: ApplicationFiled: November 23, 2010Publication date: May 24, 2012Inventors: Wanlun Zhao, Peter John Black, Jinghu Chen
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Publication number: 20120127923Abstract: A method and apparatus for enabling a low complexity DL receiver in a TD-SCDMA system is provided. The method may comprise receiving two or more signals from two or more cells, determining at least one of the two or more cells does not comprise colored noise, applying a white noise matrix approximation to each of the at least one of the two or more cells that does not comprise colored noise, applying a channel matrix approximation to the two or more received signals, and generating a MMSE coordination matrix using the white noise matrix approximation and the channel matrix approximation.Type: ApplicationFiled: November 23, 2010Publication date: May 24, 2012Inventors: Wanlun Zhao, Peter John Black, Jinghu Chen
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Publication number: 20090203386Abstract: Briefly, in accordance with one embodiment, a method of transmitting signals is provided. Signal waveforms are transmitted from at least two respective sectors. The at least two respective sectors are from at least two different sets of a superset of sectors. The transmitted signal waveforms include signal waveforms at least nearly mutually orthogonal at least along a particular signal dimension. An advantage of such an embodiment, for example, is reduced signal interference.Type: ApplicationFiled: October 27, 2008Publication date: August 13, 2009Applicant: QUALCOMM IncorporatedInventors: Stephen W. Edge, Peter John Black, Qiang Wu, Wanlun Zhao, Yeliz Tokgoz, Roberto Padovani, Ayman Fawzy Nagurib, Je Woo Kim, Pranav Dayal, Parag Arun Agashe
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Publication number: 20090124265Abstract: Briefly, in accordance with one embodiment, a method of transmitting signals is provided. Signal waveforms are transmitted from at least two respective sectors. The at least two respective sectors are from at least two different sets of a superset of sectors. The transmitted signal waveforms include signal waveforms at least nearly mutually orthogonal at least along a particular signal dimension. An advantage of such an embodiment, for example, is reduced signal interference.Type: ApplicationFiled: May 1, 2008Publication date: May 14, 2009Applicant: Qualcomm incorporatedInventors: Peter John Black, Qiang Wu, Roberto Padovani, Wanlun Zhao, Yeliz Tokgoz, Ayman Fawzy Naguib, Pranav Dayal, Parag Arun Agashe, Naga Bhushan, Je Woo Kim
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Publication number: 20090003495Abstract: Briefly, in accordance with one embodiment, a method of adjusting for digital automatic gain control (DAGC) quantization error in a mobile station is as follows. A first DAGC value is stored before reception of one or more enhanced pilot signals. A second DAGC value is computed during reception of the one or more enhanced pilot signal. The first DAGC value is restored after reception of the one or more enhanced pilot signals is over. An advantage associated with this particular embodiment may include reduction in quantization error for digital automatic gain control.Type: ApplicationFiled: May 1, 2008Publication date: January 1, 2009Applicant: Qualcomm IncorporatedInventors: Qiang Wu, Wanlun Zhao, Peter John Black