Patents by Inventor An Tuyen Banh

An Tuyen Banh 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: 7937052
    Abstract: A multiple input multiple output signal receiving apparatus includes a first antenna configured to receive a first radio frequency (RF) signal, a second antenna configured to receive a second RF signal, a superheterodyne receiver, a direct conversion receiver, and an antenna switching module. The superheterodyne receiver is configured to convert one or both of the first and second RF signals into at least one first analog signal. The direct conversion receiver is configured to convert one or both of the first and second RF signals into at least one second analog signal. The antenna switching module couples the first and second antennas to the superheterodyne receiver and the direct conversion receiver, and is configured to selectively direct the first and second RF signals to the superheterodyne receiver and/or the direct conversion receiver, depending on an antenna switch control signal indicating a signal quality derived from the first and second analog signals.
    Type: Grant
    Filed: April 17, 2007
    Date of Patent: May 3, 2011
    Assignee: Cisco Technology, Inc.
    Inventors: An Tuyen Banh, Yong Su, Xinguang Xu
  • Patent number: 7925268
    Abstract: Techniques are provided herein to optimize up-link transmission power from a wireless terminal to a base transceiver station in a multicarrier system. A pathloss between the wireless terminal and the base transceiver station is determined. A determination is made if the pathloss is less than or larger than a predetermined value. One or more sub-carriers are assigned to the wireless terminal based on whether the pathloss between the wireless terminal and the base transceiver station is less than or larger than the predetermined value. A power cap command signal is sent from the base transceiver station to the wireless terminal for limiting a maximum allowable power transmitted by the wireless terminal to a predetermined level based on proximity of the one or more sub-carriers to an edge of a frequency band used for up-link transmissions made by the wireless terminal.
    Type: Grant
    Filed: August 11, 2006
    Date of Patent: April 12, 2011
    Assignee: Cisco Technology, Inc.
    Inventors: Chris Sanders, Santhalingam Balasekar, Hang Jin, John Grabner, Tuyen Banh
  • Patent number: 7787897
    Abstract: A method is disclosed for optimizing up-link transmit powers of a wireless broadband terminal operating in a predetermined frequency band in a multi-carrier system, the method comprising assigning a transmit signal to one or more sub-carriers of predetermined frequencies, and capping the output powers of the transmit signal to a predetermined level based on the predetermined frequencies, wherein the output power of the transmit signal is lower if frequencies of the transmit signal have less guard band to the edge of the predetermined frequency band.
    Type: Grant
    Filed: May 16, 2006
    Date of Patent: August 31, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: An Tuyen Banh, Hang Jin, John Grabner
  • Publication number: 20070298748
    Abstract: A MIMO signal receiving apparatus includes a first antenna for receiving a first RF signal; a second antenna for receiving a second RF signal; a superheterodyne receiver for receiving one or all of the first and second RF signals into at least one first analog signal; a direct conversion receiver for converting one or all of the first and second RF signals into at least one second signal; and an antenna switching module coupling the first and second antennas to the superheterodyne receiver and the direct conversion receiver for electively directing the first and second RF signals to the superheterodyne receiver and/or the direct conversion receiver, depending on an antenna switch control signal indicating a signal quality derived from the first and second analog signals.
    Type: Application
    Filed: April 17, 2007
    Publication date: December 27, 2007
    Inventors: An Tuyen Banh, Yong Su, Xinguang Xu
  • Publication number: 20070060190
    Abstract: A method for optimizing up-link transmission power from a wireless terminal to a base transceiver station in a multi-carrier system is disclosed. The method includes steps of: determining a pathloss between the wireless terminal and the base transceiver station; assigning at least one sub-carrier to the terminal based on the pathloss between the wireless terminal and the base transceiver station; and sending a power cap command signal from the base transceiver station to the wireless terminal for limiting a maximum allowable power transmitted by the wireless terminal to a predetermined level based on proximity of the sub-carrier to an edge of a frequency band, over which the wireless terminal transmits and receives signals.
    Type: Application
    Filed: August 11, 2006
    Publication date: March 15, 2007
    Inventors: Chris Sanders, Santhalingam Balasekar, Hang Jin, John Grabner, Tuyen Banh
  • Patent number: 6594762
    Abstract: An electronic device and a remote device cooperate to enable a display of an electronic device when a distance between the electronic device and the remote device is less than a transmit range and to disable the display when the distance is greater than the transmit range. Disabling the display of the electronic device may improve the security of data on display. Moreover, the disabling and enabling of the display may be carried out automatically, thereby possibly relieving the authorized user from logging out or powering-off the electronic device to secure the display. When the authorized user carries the remote device, the display may be enabled and disabled as the user moves relative to the electronic device.
    Type: Grant
    Filed: May 5, 1999
    Date of Patent: July 15, 2003
    Assignee: Ericsson Inc.
    Inventors: Mike Doub, Tuyen Banh
  • Patent number: 6526294
    Abstract: A power control circuit for a short-range wireless device includes a diode positioned between the negative terminal of a battery and an external connector to force a logical LOW when the battery is recharging and a logical HIGH when the battery is in use by the voltage regulator of the device.
    Type: Grant
    Filed: September 9, 1999
    Date of Patent: February 25, 2003
    Assignee: Ericsson Inc.
    Inventors: An Tuyen Banh, Jiemei Jiao
  • Patent number: 6411828
    Abstract: A wireless user terminal operates in a mode that is selected based on an indication of the orientation of the wireless user terminal from a gravitational sensor in the wireless user terminal. When the wireless user terminal is in a first orientation, the wireless user terminal operates in a speakerphone mode. When the wireless user terminal is in a second orientation, the wireless user terminal operates in a handset mode. The mode of operation of the wireless user terminal transitions based on movement of the wireless user terminal from the first orientation to the second orientation. For example, when the wireless user terminal placed in a horizontal orientation, one of the speakerphone modes is selected. When the user picks up the wireless user terminal, the wireless user terminal transitions to handset mode.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: June 25, 2002
    Assignee: Ericsson Inc.
    Inventors: Robert Michael Lands, An Tuyen Banh
  • Patent number: 6349225
    Abstract: Wireless communications devices using a given speaker for both handset and speakerphone operation are equipped with a mechanical spacer that automatically inhibits the user from placing the speaker in close proximity to the user's ear when the wireless communications device is in speakerphone mode. The spacer is moved from a normal position to a blocking position to switch the device from handset to speakerphone mode. The mechanical spacer may take a variety of forms, such as an articulating antenna, a moveable frame, a moveable speaker flap, and the like. The extra space between the speaker and the user's ear mandated by the presence of the spacer allows the sound generated by the speaker in speakerphone mode to dissipate somewhat before reaching the user's ear, even when the speaker is held as close as possible, thereby automatically providing hearing protection when the wireless communications device is configured for speakerphone operation.
    Type: Grant
    Filed: April 1, 1999
    Date of Patent: February 19, 2002
    Assignee: Ericsson Inc.
    Inventors: Robert Michael Lands, An Tuyen Banh
  • Patent number: 6144864
    Abstract: A handheld voice communication system including a handheld computing device and a handset linked to the computing device via a retractable cable. The handheld computing device includes a data display screen and a microphone integrated therein, and the handset includes a speaker. The handset is movable between a retracted position, wherein at least one portion of the cable is retracted into the computing device and the handset is in contact with the computing device, and an extended position wherein at least one portion of the cable is extended out of the computing device and the handset is spaced away from the computing device. In one embodiment, the speaker is capable of high-level audio output when the handset is in the retracted position and capable of low-level audio output when the handset is in the extended position.
    Type: Grant
    Filed: October 16, 1998
    Date of Patent: November 7, 2000
    Assignee: Ericsson Inc.
    Inventors: Robert Michael Lands, An Tuyen Banh
  • Patent number: 6091939
    Abstract: A transmitter circuit for use in a mobile radio using both a normal frequency transmission band and a talk-around frequency transmission band is disclosed. The transmitter employs a local oscillator in the modulation circuit that operates at only a single frequency band characteristic. At the output of the modulation circuit, one of two transmission paths is selected by an RF switch. In the normal transmission path, the input signal is output in the normal frequency band. Alternatively, in the talk-around transmission path, the input signal is modulated to the talk-around frequency band and then output. The present circuitry eliminates the requirement for local oscillators having dual operational characteristics.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: July 18, 2000
    Assignee: Ericsson Inc.
    Inventor: An Tuyen Banh
  • Patent number: 5721757
    Abstract: In accordance with one embodiment of the present invention, in a wireless telecommunications system, an automatic gain control loop for a base station, comprises a demodulator having at least one output terminal. The demodulator is adapted to demodulate signals received by the base station so as to provide a plurality of phase signals via its output terminals. These phase signals correspond to the phase of the signals received by the base station. A plurality of variable-gain amplifiers are adapted to receive one of the phase signals and to change the amplitude of said phase signals. A plurality of signal processing units are adapted so as to receive signals provided by the variable amplifiers, and each of the signal processing units is further adapted to generate a feedback control signal so as to control the gain of each one of the variable-gain amplifiers.
    Type: Grant
    Filed: March 20, 1996
    Date of Patent: February 24, 1998
    Assignee: Lucent Technologies Inc.
    Inventors: An Tuyen Banh, Rulon G. VanDyke