Patents by Inventor Wing Chau Chan
Wing Chau Chan 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: 9001678Abstract: The present embodiments are directed to systems and methods for detecting random access channel requests, while excluding false random access signals using search windowing and distance-based peak suppression techniques. The present embodiments additionally include further techniques for suppression of fake random access signals, including amplitude thresholds and preamble-based signal exclusion. Beneficially, the present embodiments significantly reduce the false alarm rate, while maintaining a low hardware complexity requirements. In some embodiments, worst-case false alarm rates can be reduced from as much as 20% down to nearly 0.1%.Type: GrantFiled: February 29, 2012Date of Patent: April 7, 2015Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.Inventors: Honglei Zhang, Yuxian Zhang, Jun Xu, Wing Chau Chan
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Patent number: 8837312Abstract: Bias introduced by down-sampling may be eliminated, or significantly reduced, by the present embodiments. Methods and apparatuses are described for use in wireless communication systems including LTE and other mobile data systems. The method includes identifying a timing offset estimation bias caused by a misalignment between samples and a zero-offset point of a preamble signature.Type: GrantFiled: February 29, 2012Date of Patent: September 16, 2014Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.Inventors: Wing Chau Chan, Jun Xu
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Patent number: 8644181Abstract: The present invention relates to a method and apparatus for channel temporal correlation estimation and MIMO mode selection. An embodiment of the invention under LTE system utilizes SRS symbols for temporal correlation estimation and performs MIMO mode selection based on the said temporal correlation estimation.Type: GrantFiled: August 16, 2011Date of Patent: February 4, 2014Assignee: Hong Kong Applied Science and Technology Research Institute Company LimitedInventors: Xue-yuan Zhao, Wing Chau Chan, Cheng Wang, Henry Hui Ye
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Publication number: 20130223241Abstract: The present embodiments are directed to systems and methods for detecting random access channel requests, while excluding false random access signals using search windowing and distance-based peak suppression techniques. The present embodiments additionally include further techniques for suppression of fake random access signals, including amplitude thresholds and preamble-based signal exclusion. Beneficially, the present embodiments significantly reduce the false alarm rate, while maintaining a low hardware complexity requirements. In some embodiments, worst-case false alarm rates can be reduced from as much as 20% down to nearly 0.1%.Type: ApplicationFiled: February 29, 2012Publication date: August 29, 2013Applicant: Hong Kong Applied Science and Technology Reseach Institute Co., Ltd.Inventors: Honglei Zhang, Yuxian Zhang, Jun Xu, Wing Chau Chan
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Publication number: 20130223242Abstract: Bias introduced by down-sampling may be eliminated, or significantly reduced, by the present embodiments. Methods and apparatuses are described for use in wireless communication systems including LTE and other mobile data systems. The method includes identifying a timing offset estimation bias caused by a misalignment between samples and a zero-offset point of a preamble signature.Type: ApplicationFiled: February 29, 2012Publication date: August 29, 2013Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.Inventors: Wing Chau Chan, Jun Xu
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Publication number: 20130044610Abstract: The present invention relates to a method and apparatus for channel temporal correlation estimation and MIMO mode selection. An embodiment of the invention under LTE system utilizes SRS symbols for temporal correlation estimation and performs MIMO mode selection based on the said temporal correlation estimation.Type: ApplicationFiled: August 16, 2011Publication date: February 21, 2013Applicant: Hong Kong Applied Science and Technology Research Institute Company LimitedInventors: Xue-yuan ZHAO, Wing Chau CHAN, Cheng WANG, Henry Hui YE
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Patent number: 8315185Abstract: The present invention relates to ACK-NACK detection in an LTE wireless communication system. To determine a threshold value for an ACK-NACK transmission, an SC-FDMA signal is received from user equipment. Then, a power estimate of soft data bits is used to establish a threshold value for determining the presence of an ACK-NACK signal. Using this threshold value, a signal from the user equipment is analyzed to determine if it contains an ACK or NACK transmission.Type: GrantFiled: June 7, 2010Date of Patent: November 20, 2012Assignee: Hong Kong Applied Science and Technology Research Institute Company LimitedInventor: Wing Chau Chan
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Patent number: 8081972Abstract: A method for sensing channel availability in a wireless network includes receiving a measurement request message which includes a channel interval list. A first channel interval in the list includes information associated with a first starting channel number, a first number of channels, and first linkage information of the channel interval list. The method includes processing information associated with the message, generating a first list of contiguous channels, and performing at least first channel measurement to determine a first channel availability for each of the first list of contiguous channels. The method also includes determining whether the channel interval list further includes a second channel interval that needs to be processed based on at least first linkage information, and if needed, generating a second list of contiguous channels and performing at least second channel measurement to determine a second channel availability for each of the second list of contiguous channels.Type: GrantFiled: May 25, 2007Date of Patent: December 20, 2011Assignee: Huawei Technologies Co., Ltd.Inventors: Wing Chau Chan, Kwok Shum Au, Rui Wang, Tianyu Wu, Kin Nang Lau, Shu Kwan Cheng, Ross David Murch, Wai Ho Mow
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Publication number: 20110300849Abstract: The present invention relates to ACK-NACK detection in an LTE wireless communication system. To determine a threshold value for an ACK-NACK transmission, an SC-FDMA signal is received from user equipment. Then, a power estimate of soft data bits is used to establish a threshold value for determining the presence of an ACK-NACK signal. Using this threshold value, a signal from the user equipment is analyzed to determine if it contains an ACK or NACK transmission.Type: ApplicationFiled: June 7, 2010Publication date: December 8, 2011Inventor: Wing Chau Chan
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Patent number: 8014981Abstract: A method of modeling wireless communication channels in angular domain is disclosed. The method includes considering radiation patterns 101, 102 of the transmitter antenna and the receiver antenna, wherein the radiation patterns are represented by antenna characteristics sampled at a plurality of angular directions. A method of channel estimation based on the method of modeling wireless communication channel in angular domain is also disclosed.Type: GrantFiled: May 29, 2008Date of Patent: September 6, 2011Assignee: Hong Kong Applied Science and Technology Research Institute Company LimitedInventors: Peter Wing Chau Chan, Derek Chun Kit Lee, Roger Shu Kwan Cheng, Chih-Lin I
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Patent number: 8000398Abstract: A method of time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) communication, including the steps of: preparing OFDM-body; generating pseudo random (PN) sequence as a training signal; manipulating the PN sequence to concentrate the energy distribution thereof to the same bandwidth of sub-carriers of the OFDM-body; offsetting the manipulated PN sequence to align with frequency spectrum of the sub-carriers; and inserting the offset PN sequence as prefix of a TDS-OFDM data frame. The manipulating step may include the step of repeating the PN sequence by N times, wherein the spectrum of the repeated PN sequence concentrates on discrete bundles of sub-carriers, i.e., on one sub-carrier every N sub-carriers or M adjacent sub-carriers every MN sub-carriers, where M is an integer determined by the time duration ratio of the OFDM body and prefix.Type: GrantFiled: May 28, 2008Date of Patent: August 16, 2011Assignee: Hong Kong Applied Science and Technology Research Institute Company LimitedInventors: Zhengang Pan, Wing Chau Chan, XueYuan Zhao, Chi Ming Lo
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Publication number: 20090296834Abstract: A method of time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) communication, including the steps of: preparing OFDM-body 402; generating pseudo random (PN) sequence 403 as a training signal; manipulating the PN sequence 403 to concentrate the energy distribution thereof to the same bandwidth of sub-carriers of the OFDM-body; offsetting the manipulated PN sequence to align with frequency spectrum of the sub-carriers 406; and inserting the offset PN sequence as prefix 401 of a TDS-OFDM data frame 400. The manipulating step may include the step of repeating the PN sequence by N times, wherein the spectrum of the repeated PN sequence concentrates on discrete bundles of sub-carriers, i.e., on one sub-carrier every N sub-carriers or M adjacent sub-carriers every MN sub-carriers, where M is an integer determined by the time duration ratio of the OFDM body and prefix..Type: ApplicationFiled: May 28, 2008Publication date: December 3, 2009Applicant: Hong Kong Applied Science and Technology Research Institute Company LimitedInventors: Zhengang Pan, Wing Chau Chan, XueYuan Zhao, Chi Ming Lo
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Patent number: 7548851Abstract: A musical jukebox is disclosed which provides for: fast archiving of songs; a flexible user interface; easy and convenient entry of, access to and/or display of data relating to songs archived by the jukebox; easy and convenient search and locate capabilities for locating, reviewing, retrieving and/or playing songs stored in the jukebox; and low cost relative to the functionality, features, conveniences and user-friendliness provided by the jukebox. Fast of flush archiving of songs (as well as other data and signals) is accomplished by first saving sets of data without compression, which allows the data to be entered quickly, and then, compressing later at an appropriate time. A unique MP3 bit allocation encoding scheme is used to compress data. A unique memory allocation supports fast data archiving. The user interface employs two-way communication between a remote control and the jukebox. A searchable song database is structured to enable very fast searching by music category, and also by title and artist.Type: GrantFiled: October 11, 2000Date of Patent: June 16, 2009Inventors: Jack Lau, Chi Ying Tsui, Roger Shu Kwan Cheng, Chi Wai Yung, Jimmy Tai Kwan Tang, Kin Ping Ng, Sai Kit Lai, Kai Kin Chan, Wing Chau Chan
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Publication number: 20080293410Abstract: A method for sensing channel availability in a wireless network includes receiving a measurement request message which includes a channel interval list. A first channel interval in the list includes information associated with a first starting channel number, a first number of channels, and first linkage information of the channel interval list. The method includes processing information associated with the message, generating a first list of contiguous channels, and performing at least first channel measurement to determine a first channel availability for each of the first list of contiguous channels. The method also includes determining whether the channel interval list further includes a second channel interval that needs to be processed based on at least first linkage information, and if needed, generating a second list of contiguous channels and performing at least second channel measurement to determine a second channel availability for each of the second list of contiguous channels.Type: ApplicationFiled: May 25, 2007Publication date: November 27, 2008Applicant: Huawei Technologies Co., Ltd.Inventors: Wing Chau Chan, Kwok Shum Au, Rui Wang, Tianyu Wu, Kin Nang Lau, Shu Kwan Cheng, Ross David Murch, Wai Ho Mow