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).

  • Patent number: 9001678
    Abstract: 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: Grant
    Filed: February 29, 2012
    Date of Patent: April 7, 2015
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Honglei Zhang, Yuxian Zhang, Jun Xu, Wing Chau Chan
  • Patent number: 8837312
    Abstract: 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: Grant
    Filed: February 29, 2012
    Date of Patent: September 16, 2014
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Wing Chau Chan, Jun Xu
  • Patent number: 8644181
    Abstract: 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: Grant
    Filed: August 16, 2011
    Date of Patent: February 4, 2014
    Assignee: Hong Kong Applied Science and Technology Research Institute Company Limited
    Inventors: Xue-yuan Zhao, Wing Chau Chan, Cheng Wang, Henry Hui Ye
  • Publication number: 20130223242
    Abstract: 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: Application
    Filed: February 29, 2012
    Publication date: August 29, 2013
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Wing Chau Chan, Jun Xu
  • Publication number: 20130223241
    Abstract: 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: Application
    Filed: February 29, 2012
    Publication date: August 29, 2013
    Applicant: Hong Kong Applied Science and Technology Reseach Institute Co., Ltd.
    Inventors: Honglei Zhang, Yuxian Zhang, Jun Xu, Wing Chau Chan
  • Publication number: 20130044610
    Abstract: 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: Application
    Filed: August 16, 2011
    Publication date: February 21, 2013
    Applicant: Hong Kong Applied Science and Technology Research Institute Company Limited
    Inventors: Xue-yuan ZHAO, Wing Chau CHAN, Cheng WANG, Henry Hui YE
  • Patent number: 8315185
    Abstract: 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: Grant
    Filed: June 7, 2010
    Date of Patent: November 20, 2012
    Assignee: Hong Kong Applied Science and Technology Research Institute Company Limited
    Inventor: Wing Chau Chan
  • Patent number: 8081972
    Abstract: 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: Grant
    Filed: May 25, 2007
    Date of Patent: December 20, 2011
    Assignee: 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
  • Publication number: 20110300849
    Abstract: 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: Application
    Filed: June 7, 2010
    Publication date: December 8, 2011
    Inventor: Wing Chau Chan
  • Patent number: 8014981
    Abstract: 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: Grant
    Filed: May 29, 2008
    Date of Patent: September 6, 2011
    Assignee: Hong Kong Applied Science and Technology Research Institute Company Limited
    Inventors: Peter Wing Chau Chan, Derek Chun Kit Lee, Roger Shu Kwan Cheng, Chih-Lin I
  • Patent number: 8000398
    Abstract: 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: Grant
    Filed: May 28, 2008
    Date of Patent: August 16, 2011
    Assignee: Hong Kong Applied Science and Technology Research Institute Company Limited
    Inventors: Zhengang Pan, Wing Chau Chan, XueYuan Zhao, Chi Ming Lo
  • Publication number: 20090296834
    Abstract: 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: Application
    Filed: May 28, 2008
    Publication date: December 3, 2009
    Applicant: Hong Kong Applied Science and Technology Research Institute Company Limited
    Inventors: Zhengang Pan, Wing Chau Chan, XueYuan Zhao, Chi Ming Lo
  • Patent number: 7548851
    Abstract: 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: Grant
    Filed: October 11, 2000
    Date of Patent: June 16, 2009
    Inventors: 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
  • Publication number: 20080293410
    Abstract: 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: Application
    Filed: May 25, 2007
    Publication date: November 27, 2008
    Applicant: 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