Patents by Inventor Chia-Chi Huang

Chia-Chi 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).

  • Publication number: 20080165672
    Abstract: The present invention provides a joint channel estimation and data detection method for STBC/OFDM systems, comprising the following steps: a preliminary step, in which, after passing the received signals through an OFDM demodulator, frequency-domain signals R1[k] and R2[k] of the complementary-coded pilot preambles in two successive OFDM symbol times, as well as two successive OFDM data symbols R1(i)[k] and R2(i)[k] at the ith time slot, are obtained; an initial step for setting up the predetermined number Np of the channel path, using complementary-coded pilot preambles to estimate the channel impulse response, then using this estimation result of the channel impulse response to calculate a path selective set Sm,, and furthermore, in accordance with the path selective set Sm, determining the number Lm of the selected paths and the excess delay ?m,l of the selected path, and then calculating the initial channel state information vector y(1,0) and the Hessian matrix F; a tracking step, in which the initial val
    Type: Application
    Filed: May 24, 2007
    Publication date: July 10, 2008
    Applicant: National Chiao Tung University
    Inventors: Meng-Lin Ku, Chia-Chi Huang
  • Patent number: 7387005
    Abstract: A bathroom lock device includes an inner locking mechanism and a lock set. The inner locking mechanism includes a manual control rod, an unlocking rotary plate and an inner actuating rotary plate. The manual control rod has a rotatable wheel while the unlocking rotary plate has a pair of actuating protrusions. In a locking operation, the manual control rod is pressed to a locking position so as to limit a rotational movement of the inner actuating rotary plate. In an unlocking operation, the manual control rod is returned to an unlocking position by turning a lever so as to permit turning the inner actuating rotary plate. When the lever turns the unlocking rotary plate, the actuating protrusions of the unlocking rotary plate smoothly push the rotatable wheel of the manual control rod so as to return the manual control rod to the unlocking position.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: June 17, 2008
    Assignee: Taiwan Fu Hsing Industrial Co., Ltd.
    Inventors: Lan-Shi Huang, Chia-Chi Huang
  • Publication number: 20080087051
    Abstract: A door lock and drive tube assembly thereof comprises a first handle assembly, a second handle assembly and a lock releasing assembly. The first handle assembly has a handle, a spindle, a catch and a drive tube assembly. The handle has a hollow coupling portion and the hollow coupling portion has an access opening. The spindle is attached to the hollow coupling portion of the handle. The catch is installed in the spindle and has an engagement head, and the engagement head is selectively disposable within the access opening of the handle. The drive tube assembly is installed within the spindle and has a stop member to prevent the engagement head of the catch disengaging from the access opening. The second handle assembly corresponds to the first handle assembly. The lock releasing assembly is installed between the first handle assembly and the second handle assembly and includes a rod to push the stop member of the drive tube assembly so as to block the catch.
    Type: Application
    Filed: October 11, 2006
    Publication date: April 17, 2008
    Inventor: Chia-Chi Huang
  • Patent number: 7310393
    Abstract: A method and apparatus for the signal synchronization of an orthogonal frequency division multiplexing system includes a delay conjugate multiplication module, a phase processor and an edge detector. It provides estimates for the boundaries of inter-symbol interference free region by utilizing the characteristics of a guard interval in combination with the techniques of the delay conjugate multiplication module, phase differential operation, symbol-by-symbol average operation, and edge detection. The method determines a fixed optimal threshold for directly separating the inter-symbol interference region in a mobile environment to obtain an inter-symbol interference free version of symbol information.
    Type: Grant
    Filed: April 27, 2004
    Date of Patent: December 18, 2007
    Assignee: Industrial Technology Research Institute
    Inventors: Chorng-Ren Sheu, Meng-Chun Chang, Chia-Chi Huang, Yu-jung Chang
  • Publication number: 20070068209
    Abstract: A bathroom lock device includes an inner locking mechanism and a lock set. The inner locking mechanism consists of a manual control rod, an unlocking rotary plate and an inner actuating rotary plate. The manual control rod has a rotatable wheel while the unlocking rotary plate has a pair of actuating protrusions. In locking operation, the manual control rod is pressed to a locking position so as to limit a rotational movement of the inner actuating rotary plate. In unlocking operation, the manual control rod is returned to an unlocking position by turning a lever so as to permit turning the inner actuating rotary plate. When the lever turns the unlocking rotary plate, the actuating protrusions of the unlocking rotary plate smoothly push the rotatable wheel of the manual control rod so as to return the manual control rod to the unlocking position.
    Type: Application
    Filed: September 28, 2005
    Publication date: March 29, 2007
    Applicant: Taiwan Fu Hsing Industrial Co., Ltd.
    Inventors: Lan-Shi Huang, Chia-Chi Huang
  • Publication number: 20050105659
    Abstract: A method and apparatus for the signal synchronization of an OFDM system are proposed including a delay conjugate multiplication module, a phase processor and an edge detector. It provides estimates for the boundaries of ISI-free region by utilizing the characteristics of the guard interval and combining the techniques of the delay conjugate multiplication module, phase differential operation, symbol-by-symbol average operation, and edge detection. This method provides an improved performance in a multi-path fading channel with large delay spread, and can be utilized in a broadcasting system, such as the DAB and DVB-T systems. This invention is easy to determine a fixed optimal threshold that can directly separate the ISI region in any mobile environment, thereby most symbol information with ISI-free version can be obtained.
    Type: Application
    Filed: April 27, 2004
    Publication date: May 19, 2005
    Inventors: Chorng-Ren Sheu, Meng-Chun Chang, Chia-Chi Huang, Yu-jung Chang
  • Publication number: 20040044679
    Abstract: A system and method for generating reports from a website program residing in a web server (30). The system comprises: a data collection module (41) that periodically gathers data to update a database (51); a user interface module (42) that manages users' requests, said user requests including requests for logon and requests for reports; a data service module (43) that retrieves from the database data requested for generation of reports; and a report generation module (44) that encapsulates instances of requests for reports and instantiates said instances to generate reports based on data supplied by the data service module in accordance with requests for reports. Users can access the system through web browsers to request required reports. One example of such reports is reports containing financial data.
    Type: Application
    Filed: December 27, 2002
    Publication date: March 4, 2004
    Inventors: Kuo-Chin Chang, WenZhen Ma, Nong Ji, Chia-Chi Huang
  • Patent number: 6549862
    Abstract: A vector network analyzer using sliding correlator techniques and multi-user detection techniques. The sliding correlator technique is based on the time domain sliding effect caused by a small clock frequency offset in the pseudo random code generators of a transmitter and a receiver. A time scaled version of the impulse response of the device under test can be obtained from the time domain slided pseudo random code signals by using a correlator. A multi-user detection method is introduced using two uncorrelated pseudo random codes. One of the uncorrelated pseudo random codes measures the D.U.T. and another code is a reference channel. These codes can be demodulated and despread with one receiver module. A Fast Fourier Transform of the measured impulse response is the frequency response of the measured signal.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: April 15, 2003
    Assignee: National Science Council
    Inventors: Chia-Chi Huang, Yuh-Maiw Jong, Jian-Hui Shen
  • Patent number: 6266361
    Abstract: A method and an architecture for correcting carrier frequency offset and spreading code timing offset in a direct sequence spread spectrum communication system are disclosed. In the present invention, the carrier frequency offset is divided into an integer part and a fractional part, wherein the integer part is defined as integer multiples of the reciprocal of the period of a spreading code. The integer part of the carrier frequency offset can be obtained by matching received signals with a spreading code whose central frequency is located at integer multiples of the reciprocal of the period of the spreading code and searching the one, of the matched results, with the largest amplitude. Besides, a direction flag can be obtained by comparing the amplitude of the searched one with that of the matched results neighboring the searched one.
    Type: Grant
    Filed: July 21, 1998
    Date of Patent: July 24, 2001
    Assignee: Chung-Shan Institute of Science and Technology
    Inventors: Chia-Chi Huang, Shin-Yuan Wang, Yuh-Maiw Jong
  • Patent number: 6154443
    Abstract: The present invention provides a CDMA RAKE receiver that computes a data detection using Fast Fourier Transform (FFT) matched filters. Signals received are processed in frequency domain by the RAKE receiver. The RAKE receiver includes a pilot signal spreading code matched filter, a data signal spreading code matched filter and a channel matched filter. The pilot signal spreading code matched filter removes a spreading code of the pilot signal. The data signal spreading code matched filter removes a multiple access spreading code of the data signal. A channel matched filter estimates the channel frequency response and combine the received data signal from different paths before a decision is made. For increasing the CDMA system capacity, the RAKE receiver uses a interference cancellation method. A downlink receiver at a mobile station estimates the interference of a pilot signal and subtracts the pilot interference from the received signal before data detection.
    Type: Grant
    Filed: August 11, 1998
    Date of Patent: November 28, 2000
    Assignee: Industrial Technology Research Institute
    Inventors: Chia-Chi Huang, Shin-Iuan Wang, Yung-Liang Huang
  • Patent number: 6058101
    Abstract: A synchronization system and method for obtaining frame, carrier, and sampling synchronization of an input OFDM modulated digital signal having a pseudoperiodic second symbol. The system includes an apparatus for obtaining frame synchronization, and the apparatus includes an envelope detector to detect the first symbol of the input signal, and a differentiator connected to the envelope detector to detect the second symbol. The differentiator includes a first filter having a transfer function H(z)=(1+z.sup.-1) and a second filter having a transfer function H.sub.p (z)=(1-z.sup.-n/2 +z.sup.-n -z.sup.-3n/2), where n equals to a number of samples in the input signal. Synchronization of the carrier frequency offset is obtained by first obtaining the fractional carrier frequency offset, and then obtaining the integral carrier frequency offset through a matched filtering process. Sampling frequency synchronization is obtained through the matched filtering process for determining integral carrier frequency offset.
    Type: Grant
    Filed: June 11, 1997
    Date of Patent: May 2, 2000
    Assignee: Industrial Technology Research Institute
    Inventors: Yung-Liang Huang, Chun-Chian Lu, Chia-Chi Huang
  • Patent number: 5991289
    Abstract: A synchronization system for an input signal having a plurality of OFDM symbols, each symbol having at least one guard interval, includes a correlation device for providing a product of the input signal with a complex conjugate of the input signal delayed for a predetermined period, an arithmetic device for obtaining an argument value of the product, and a detection device for detecting a transition in phase values of an output of the arithmetic device, wherein the transition occurring when the phase value in one portion of the symbol duration is substantially smaller than another portion of the symbol duration. The system additionally includes a power estimator for detecting an OFDM symbol frame of the input signal with reference to a predetermined threshold, and a device for estimating fractional carrier frequency offset.
    Type: Grant
    Filed: August 5, 1997
    Date of Patent: November 23, 1999
    Assignee: Industrial Technology Research Institute
    Inventors: Chia-Chi Huang, Yung-Liang Huang, Chorng-Ren Sheu
  • Patent number: 5867059
    Abstract: A demodulating system for estimating frequency offset and sampling time error by a Fast Fourier Transform operation, which receives a modulated signal sent from a GMSK (Gaussian Low-Pass Filtered Minimum Shift Keying) or a MSK (Minimum Shift Keying) transmitter and demodulates the signal. The demodulating system uses a Fast Fourier Transform converter to obtain frequency offset and sampling time error by applying to it an initial demodulated result generated from a discriminator or a phase differentiator.
    Type: Grant
    Filed: June 22, 1995
    Date of Patent: February 2, 1999
    Assignee: National Science Council
    Inventors: Chia-Chi Huang, Yung-Liang Huang, Kon-Da Fan
  • Patent number: 5507035
    Abstract: In a mobile cellular communication system, a base station is wired to a Local Area Network (LAN), and has wireless communication with a plurality of mobile stations. Multipath fading is substantially reduced in the system by utilizing antenna diversity techniques at the base station and each of the plurality of mobile stations. The combination of the independent operation of antenna selection diversity at both a base station and a mobile station results in the selection of the best propagation path between the two stations.
    Type: Grant
    Filed: April 30, 1993
    Date of Patent: April 9, 1996
    Assignee: International Business Machines Corporation
    Inventors: David F. Bantz, Frederic J. Bauchot, Chia-Chi Huang, Nicholas J. A. Moulton
  • Patent number: 5448569
    Abstract: Methods for handoff in a wireless communication network including a local area network connected to a plurality of base stations, each of which has a geographic area, defined as a cell, within which mobile stations can communicate with a base station, with each such base station being capable of performing bidirectional wireless communication with one or more of said mobile stations under control of a controller, with communication between base stations and mobile stations being performed by frequency hopping, with there being n available frequency hopping channels in a fixed frequency band, with each channel being of a same fixed duration and having a fixed frequency different than another channel.
    Type: Grant
    Filed: April 12, 1994
    Date of Patent: September 5, 1995
    Assignee: International Business Machines Corporation
    Inventors: Chia-Chi Huang, David F. Bantz, Frederic Bauchot, Kadathur S. Natarajan, Anand Narasimhan, Michele M. Wetterwald
  • Patent number: 5442659
    Abstract: A method for use in multicellular communication network system of the type having base stations and a plurality of remote stations. The method achieves reliable and fault tolerant synchronization between the stations in a call when a frequency hopping technique is used. The method includes steps for acquiring the frequency hop sequence by remote station and tracking the frequency hop sequence after acquisition in order to stay in synchronism. The method also provides for recovering from loss of synchronism and for staying in synchronism.
    Type: Grant
    Filed: October 22, 1993
    Date of Patent: August 15, 1995
    Assignee: International Business Machines Corporation
    Inventors: Frederick J. Bauchot, Chia-Chi Huang, Ilan Kessler, Kadathur S. Natarajan
  • Patent number: 5394433
    Abstract: A control system for automated management of frequency-hopping in a radio network. The system includes a Wireless Network Manager (WNM) or Controller and a Wireless Control Agent (WCA), which control the distribution and maintenance of hopping patterns in the radio network. In a single cell network, the WNM and the WCA are included in a single base station. In a multiple cell network, the WNM is in a specific station on a LAN, and a WCA is located in each base station on the LAN. In each instance, the WNM is a centralized managing station and the WCA acts as a cell controller.
    Type: Grant
    Filed: April 22, 1993
    Date of Patent: February 28, 1995
    Assignee: International Business Machines Corporation
    Inventors: David F. Bantz, Frederick J. Bauchot, Chia-Chi Huang, Fabien P. Lanne, Kadathur S. Natarajan, Michelle M. Wetterwald
  • Patent number: 5241542
    Abstract: A method and apparatus for conserving battery power in a wireless link adapter of a battery operated computer such as a portable laptop computer, as controlled by a scheduled multiaccess protocol. The portable computer is operable as a mobile unit in a multi-cell wireless network. The scheduled access multiaccess protocol is implemented to effectively conserve battery power by suitable control of the state of the controller, the transmitter and receiver units at the wireless link adapter by scheduling when the adapter is in a normal running mode, or a standby mode in which power is conserved.
    Type: Grant
    Filed: August 23, 1991
    Date of Patent: August 31, 1993
    Assignee: International Business Machines Corporation
    Inventors: Kadathur S. Natarajan, Chia-Chi Huang
  • Patent number: D540437
    Type: Grant
    Filed: July 10, 2006
    Date of Patent: April 10, 2007
    Assignee: Taiwan Fu Hsing Industrial Co., Ltd.
    Inventor: Chia-Chi Huang
  • Patent number: D554974
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: November 13, 2007
    Assignee: Taiwan Fu Hsing Industrial Co., Ltd.
    Inventor: Chia-Chi Huang