Patents by Inventor Jiangnan (Jason) Chen

Jiangnan (Jason) Chen 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: 20090168708
    Abstract: A technique for operating a wireless communication device includes assigning re-transmission identifiers, such as hybrid automatic repeat request (HARQ) channel identifications, automatic repeat request (ARQ) channel identifications, and ARQ Identifier Sequence Numbers, to at least a first re-transmission identifier group and a second re-transmission identifier group, wherein each re-transmission identifier group is associated with a different quality of service parameter. The technique identifies whether a committed quality of service is met for a connection based on whether a communication on the connection is associated with the first re-transmission identifier group or the second re-transmission identifier group.
    Type: Application
    Filed: October 27, 2008
    Publication date: July 2, 2009
    Applicant: MOTOROLA, INC.
    Inventors: Prachi P. Kumar, Gregory M. Agami, Jiangnan Jason Chen, Mark J. Marsan, Trang K. Nguyen
  • Publication number: 20090149144
    Abstract: An apparatus amplifies RF signals in a communication system by using a first directional coupler having at least two inputs and at least two outputs; at least two RF amplifiers, where an input of each RF amplifier is connected to a different one of the at least two outputs of the first directional coupler; and a second directional coupler having at least two inputs and at least two outputs, where each one of the at least two inputs is connected to an output of a different one of the at least two RF amplifiers. The at least two outputs of the second directional coupler are connected to at least two antennas, respectively.
    Type: Application
    Filed: December 6, 2007
    Publication date: June 11, 2009
    Applicant: MOTOROLA, INC.
    Inventors: Yuda Yehuda Luz, Jiangnan Jason Chen
  • Publication number: 20090109960
    Abstract: A method and apparatus for a virtual circuit data area within a packet data frame is disclosed. The method may include operating (320) in a multiple connections sharing packet data frame structure with a packet oriented switching wireless access point and a related network for providing data to a wireless communication device engaged in data communications and determining (330) if a pseudo-circuit switched data area within a packet data frame format is optimal for a connection. The method may also include setting up (340) a virtual circuit data area within a packet data frame using a control configuration if a pseudo-circuit switched data area within a packet data frame format is optimal for a connection and sending (350) data in the virtual circuit data area.
    Type: Application
    Filed: October 30, 2007
    Publication date: April 30, 2009
    Applicant: MOTOROLA, INC.
    Inventors: Jiangnan Jason Chen, Michael J. Diesen, Yuda Y. Luz
  • Patent number: 7489942
    Abstract: A method and apparatus provide for soft handoff operation of at least a first signal transmitted according to a first communication standard (IS-95B) and a second signal transmitted according to a second communication standard (IS-95C).
    Type: Grant
    Filed: February 4, 2004
    Date of Patent: February 10, 2009
    Assignee: Motorola, Inc.
    Inventors: Louay Jalloul, Keith A. Tenbrook, Yuda Yehuda Luz, Jiangnan (Jason) Chen, Ron Rotstein
  • Publication number: 20090003467
    Abstract: A method, information processing system, and base station for reshaping power profiles in Orthogonal Frequency Division Multiple Access (OFDMA) symbols. The method includes monitoring a scheduler (116) at a base station (110) for a modulation and coding scheme selection. Determining that the scheduler (116) selected a modulation and coding scheme. Identifying at least one information element (220) within the symbol. Determining, in response to the identifying, a channel connection (210) associated with the at least one information element (220). Determining a channel condition associated with the channel connection (210). Reshaping a power profile associated with the one information element (220). The reshaping decreases power made available to the channel connection (210).
    Type: Application
    Filed: June 27, 2007
    Publication date: January 1, 2009
    Applicant: MOTOROLA, INC.
    Inventor: Jiangnan Jason Chen
  • Publication number: 20080144567
    Abstract: A method and apparatus includes a scheduling entity (308) for scheduling and transmitting the superframe (402) across a communication network (200). The controller (310) coupled with scheduling entity (308) groups the subscriber unit (304) into one of the plurality of groups. The scheduler entity (308) assigns a coding scheme for each group and encodes each frame of the superframe (402) based upon the assigned coding scheme for the group, to which the frame is to be transmitted. The transceiver (316) coupled with controller (310) via hardware interface (314) receives the encoded superframe and transmits the superframe to the plurality of subscriber units in the communication network (200).
    Type: Application
    Filed: December 19, 2006
    Publication date: June 19, 2008
    Applicant: MOTOROLA, INC.
    Inventors: Gregory M. Agami, Jiangnan Jason Chen, Kadathur S. Natarajan
  • Publication number: 20080057969
    Abstract: A wireless communication system that provides periodic channel quality feedback adjusts a channel condition reporting period for a subscriber station based on the multiple channel condition information reports, such as CQI messages, received from the subscriber station.
    Type: Application
    Filed: September 5, 2006
    Publication date: March 6, 2008
    Applicant: MOTOROLA, INC.
    Inventors: Gregory M. Agami, Saten D. Barve, Jiangnan Jason Chen, Prachi P. Kumar
  • Patent number: 7054656
    Abstract: Using conventional techniques, a common power control channel provides information used by mobile stations for power control operation of each mobile station. In accordance with the present invention, the common power control channel is also used to provide information used by the mobile stations for purposes other than the power control operation of each mobile station. In one embodiment, the information used for purposes other than power control operation comprises information instruction the mobile station to transition to an active state. In another embodiment, the information used for non-power control purposes is transmitted to mobile stations during periods in which the power control information is not being transmitted. Using a common power control channel in this manner substantially reduces the resources consumed by a mobile station while operating in a stand-by state.
    Type: Grant
    Filed: August 2, 2002
    Date of Patent: May 30, 2006
    Assignee: Motorola, Inc.
    Inventors: Frank Fei Zhou, Jiangnan Jason Chen, Fan Wang
  • Patent number: 6909707
    Abstract: A method and apparatus for reuse of pseudo-random noise (PN) offsets within a cell of a wireless communication system such as a multi-sector CDMA system. Adaptive antenna arrays are employed to form the multiple sector areas within the CDMA cell. A forward link data channel is established between a mobile unit and a base station via sectors that share or reuse comment PN offsets, thereby providing desirable transmit diversity.
    Type: Grant
    Filed: November 6, 2001
    Date of Patent: June 21, 2005
    Assignee: Motorola, Inc.
    Inventors: Ron Rotstein, Yuda Yehuda Luz, Robert T. Love, Dennis Ray Schaefer, Jiangnan (Jason) Chen, Colin Frank
  • Patent number: 6785321
    Abstract: A threshold tracking loop (TTL) (400) for detecting the time of arrival of a spread spectrum wireless communication signal includes a pseudo-noise (PN) generator (440) for generating a receive PN code for use in spread spectrum decoding and a series of time delay units (401-408) for adjusting a phase offset of the PN code. A first PN despreader (423) is coupled to the time delay units and PN generator for despreading an early pilot signal (413). A second despreader (425) is coupled to the time delay units and PN generator for despreading a late pilot signal (415). A first comparison circuit (443) is coupled to the first PN despreader for comparing a signal value of the early pilot signal with a preselected threshold value (322) and for advancing the PN code phase offset if the early signal value is greater than the threshold value.
    Type: Grant
    Filed: October 31, 2000
    Date of Patent: August 31, 2004
    Assignee: Motorola, Inc.
    Inventors: Roy Yang, Jiangnan Jason Chen
  • Patent number: 6775341
    Abstract: The present invention is a time recovery circuit and method for synchronizing timing of a signal in a receiver to timing of the signal in a transmitter. A plurality of samples of the early-late correlation difference are taken around the equilibrium point on the S-curve where the time error is zero. A recursive algorithm is used to compute the time adjustment necessary to time align the transmitter and the receiver by minimizing the squared estimation error.
    Type: Grant
    Filed: November 21, 2002
    Date of Patent: August 10, 2004
    Assignee: Motorola, Inc.
    Inventors: Fan Wang, Jiangnan Jason Chen, Philip Yuanping Zhou
  • Patent number: 6768908
    Abstract: A method and apparatus provide for soft handoff operation of at least a first signal transmitted according to a first communication standard (IS-95B) and a second signal transmitted according to a second communication standard (IS-95C).
    Type: Grant
    Filed: April 7, 2000
    Date of Patent: July 27, 2004
    Assignee: Motorola, Inc.
    Inventors: Louay Jalloul, Keith A. Tenbrook, Yuda Yehuda Luz, Jiangnan (Jason) Chen, Ron Rotstein
  • Patent number: 6738019
    Abstract: An apparatus for driving a sectored or multi beam antenna configuration and corresponding method of level loading amplifiers is suitable for use in a transmitter. The apparatus includes a plurality of Fourier Transform Matrix (FTM) devices 501, each FTM device having a plurality of outputs 513 and a plurality of inputs 511; where the plurality of outputs of an FTM device 503 include a first output A1 and a second output B2 arranged to be coupled, respectively to a first antenna array 403 and a second antenna array 405 and these antenna arrays are included in a plurality of antenna arrays collectively comprising the antenna configuration where the first antenna array and the second antenna array corresponding to different sectors and beams, and a plurality of amplifiers 517, 519, 521, 523 corresponding to each of the FTM devices, where one of the plurality of amplifiers coupled to and driving each of the plurality of inputs.
    Type: Grant
    Filed: April 10, 2003
    Date of Patent: May 18, 2004
    Assignee: Motorola, Inc.
    Inventors: Yuda Luz, Ron Rotstein, Jiangnan Jason Chen
  • Patent number: 6717978
    Abstract: A method and apparatus for system time alignment is provided. The method and apparatus for a system time alignment provides synchronization between system components even when one or more system components remains in a quiescent mode for an extended period of time. Compensation for changes in propagation delay between system components is provided, even when such changes in propagation delay occur while one or more system components is in a quiescent mode. A searcher (402) searches a raw data signal for a maximal energy, and a shifter (403) shifts a spreading sequence a plurality of times. An accumulator (408) accumulates a plurality of sets of symbols to produce a plurality of symbol energies. A time offset calculator (410) calculates an updated time offset value and an updated system time value and updates a reference position counter (202) and a system time counter (205), respectively, with these values.
    Type: Grant
    Filed: May 23, 2000
    Date of Patent: April 6, 2004
    Assignee: Motorola, Inc.
    Inventors: Roy Xun Yang, Stefan Paun, Jiangnan Jason Chen
  • Publication number: 20040023699
    Abstract: Using conventional techniques, a common power control channel provides information used by mobile stations for power control operation of each mobile station. In accordance with the present invention, the common power control channel is also used to provide information used by the mobile stations for purposes other than the power control operation of each mobile station. In one embodiment, the information used for purposes other than power control operation comprises information instruction the mobile station to transition to an active state. In another embodiment, the information used for non-power control purposes is transmitted to mobile stations during periods in which the power control information is not being transmitted. Using a common power control channel in this manner substantially reduces the resources consumed by a mobile station while operating in a stand-by state.
    Type: Application
    Filed: August 2, 2002
    Publication date: February 5, 2004
    Inventors: Frank Fei Zhou, Jiangnan Jason Chen, Fan Wang
  • Patent number: 6661284
    Abstract: A base station subsystem includes at least one transmit branch having a forward path that includes a signal processing unit coupled at an input to an input Fourier Transform Matrix (FTM) and at an output to an output FTM. The transmit branch further includes two error compensation loops, an inner feedback loop and an outer feedback loop. The inner feedback loop provides error compensation for error introduced by the signal processing section to a signal input to the transmit branch. The outer loop provides error compensation for all residual error introduced into the signal when routed through the transmit branch forward path after error compensation may be performed by the inner feedback loop.
    Type: Grant
    Filed: May 15, 2002
    Date of Patent: December 9, 2003
    Assignee: Motorola, Inc.
    Inventors: Yuda Luz, Jiangnan Jason Chen, Philip Zhou
  • Publication number: 20030214355
    Abstract: A base station subsystem includes at least one transmit branch having a forward path that includes a signal processing unit coupled at an input to an input Fourier Transform Matrix (FTM) and at an output to an output FTM. The transmit branch further includes two error compensation loops, an inner feedback loop and an outer feedback loop. The inner feedback loop provides error compensation for error introduced by the signal processing section to a signal input to the transmit branch. The outer loop provides error compensation for all residual error introduced into the signal when routed through the transmit branch forward path after error compensation may be performed by the inner feedback loop.
    Type: Application
    Filed: May 15, 2002
    Publication date: November 20, 2003
    Inventors: Yuda Luz, Jiangnan Jason Chen, Philip Zhou
  • Publication number: 20030108136
    Abstract: The present invention is a time recovery circuit and method for synchronizing timing of a signal in a receiver to timing of the signal in a transmitter. A plurality of samples of the early-late correlation difference are taken around the equilibrium point on the S-curve where the time error is zero. A recursive algorithm is used to compute the time adjustment necessary to time align the transmitter and the receiver by minimizing the squared estimation error.
    Type: Application
    Filed: November 21, 2002
    Publication date: June 12, 2003
    Inventors: Fan Wang, Jiangnan Jason Chen, Philip Yuanping Zhou