Patents by Inventor Kelvin Gao

Kelvin Gao 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).

  • Method, apparatus and system for determining voltage standing wave ratio in a downlink period of radio communication
    Patent number: 9113367
    Abstract: The present invention discloses a method for determining a Voltage Standing Wave Ratio (VSWR) in downlink period of a radio communication, comprising: coupling a forward signal into a Transmitter Observation Receiver (TOR) via a Radio Frequency (RF) switch; feeding a reversed signal in a reversed path from a third port of a circulator into the TOR via the RF switch; making down conversion, filtering and converting the forward signal and the reversed signal from an analog signal into digital baseband signal respectively; measuring and storing power levels of the forward signal and the reversed signal in form of digital baseband; and calculating VSWR or Return Loss (RL) value from the stored power levels of the forward signal and the reversed signal. A corresponding apparatus and radio communication system are also provided. This provides an improved VSWR detection method with low complexity and low cost, etc.
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: August 18, 2015
    Assignee: OPTIS CELLULAR TECHNOLOGY, LLC
    Inventors: Kelvin Gao, Yazhuo Li
  • METHOD, APPARATUS AND SYSTEM FOR DETERMINING VOLTAGE STANDING WAWE RATIO IN DOWNLINK PERIOD OF RADIO COMMUNICATION
    Publication number: 20140050114
    Abstract: The present invention discloses a method for determining a Voltage Standing Wave Ratio (VSWR) in downlink period of a radio communication, comprising: coupling a forward signal into a Transmitter Observation Receiver (TOR) via a Radio Frequency (RF) switch; feeding a reversed signal in a reversed path from a third port of a circulator into the TOR via the RF switch; making down conversion, filtering and converting the forward signal and the reversed signal from an analog signal into digital base-band signal respectively; measuring and storing power levels of the forward signal and the reversed signal in form of digital baseband; and calculating VSWR or Return Loss (RL) value from the stored power levels of the forward signal and the reversed signal. A corresponding apparatus and radio communication system are also provided. This provides an improved VSWR detection method with low complexity and low cost, etc.
    Type: Application
    Filed: April 29, 2011
    Publication date: February 20, 2014
    Applicant: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Kelvin Gao, Yazhuo Li