Patents Assigned to Ralink Technology Corporation
  • Publication number: 20120280744
    Abstract: A charge pump circuit includes a charge generation circuit, a tracking circuit, a replica circuit, and a main charge pump. The main charge pump generates a charge current and a discharge current to a subsequent loop filter according to a UP signal and a DOWN signal. The replica circuit generates a first voltage in response to the current values of the first current source and the second current source of the main charge pump. The tracking circuit adjusts the current values of the first current source and the second current source of the main charge pump according to the first voltage and a second voltage, wherein the second voltage is in response to a voltage of an output node of the main charge pump.
    Type: Application
    Filed: September 23, 2011
    Publication date: November 8, 2012
    Applicant: RALINK TECHNOLOGY CORPORATION
    Inventor: Yi Bin HSIEH
  • Publication number: 20120254473
    Abstract: A method of establishing a virtual USB interface for a non-USB device, comprising the steps of establishing a non-USB interface to communicate with the non-USB device, generating a virtual USB physical device object to provide a USB transport layer driver, establishing the virtual USB interface to communicate with the USB transport layer driver, filtering a transmitting command of the USB transport layer driver based on the virtual USB interface, and filtering a returned information of the non-USB device based on the non-USB interface.
    Type: Application
    Filed: September 8, 2011
    Publication date: October 4, 2012
    Applicant: RALINK TECHNOLOGY CORPORATION
    Inventors: Hao Sheng Hsu, Chiung Hsun Hsu, Jih Chun Tsai
  • Publication number: 20120243540
    Abstract: A method for offloading packet segmentations includes the steps of retrieving a packet segmentation offloading parameter in a packet and segmenting the packet into a plurality of sub-packets by taking consideration the packet segmentation offloading parameter. A device for offloading packet segmentations includes a packet parser configured to receive a packet to be transmitted, a header buffer controller configured to retrieve a header of the packet and connected to a buffer to access the header, an extractor configured to retrieve a packet segmentation offloading parameter in the packet, and a segmentation module configured to segment the packet into a plurality of sub-packets by taking consideration the header and the packet segmentation offloading parameter.
    Type: Application
    Filed: September 8, 2011
    Publication date: September 27, 2012
    Applicant: RALINK TECHNOLOGY CORPORATION
    Inventor: Kuo Cheng LU
  • Patent number: 8270380
    Abstract: The method generates a candidate list in accordance with the contents of frames transmitted by access points and sequentially performs the handshaking operations with the access points on the candidate list to select a personal identification number (PIN) enabled access point. During the candidate list generating process, this method places Wi-Fi protected setup (WPS) PIN-enabled access points at high priority positions but eliminates non-WPS access points and WPS push button configuration enabled access points.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: September 18, 2012
    Assignee: Ralink Technology Corporation
    Inventors: Jui Chu Peng, Ya Wen Yang, Sung Chien Tang
  • Patent number: 8249539
    Abstract: A device and method for DC offset cancellation device are disclosed. The method includes keeping a high pass module at off state, converting an analog radio frequency signal to a digital baseband signal by a direct down conversion receiving module, detecting a DC offset value during the conversion by an offset compensation module so as to provide an offset compensation signal corresponding to the DC offset value to the direct down conversion receiving module, and determining whether a control condition is reached by a control module so as to timely switch on the high pass module for canceling the residual DC offset in the direct down conversion receiving module. In the present invention, the offset compensation module provides preliminary offset compensation signals and then the high pass module accurately cancels residual DC offset, thereby significantly reducing the reaction time for DC offset cancellation.
    Type: Grant
    Filed: July 20, 2009
    Date of Patent: August 21, 2012
    Assignee: Ralink Technology Corporation
    Inventors: Che-Hung Liao, Wen-Kai Li
  • Patent number: 8228807
    Abstract: Instead of scanning all the channels at once, the present method separates a channel scanning procedure into multiple channel scanning operations. The method reduces a data loss rate during the operation by returning to the operating channel an associated access point operates on in accordance with a return period for transceiving blocked packets.
    Type: Grant
    Filed: July 23, 2009
    Date of Patent: July 24, 2012
    Assignee: Ralink Technology Corporation
    Inventors: Cheng Lung Tsai, Sung Chien Tang
  • Patent number: 8217834
    Abstract: The method for beamforming in a wireless communication system comprises the steps of: receiving a sounding packet so as to estimate channel state information between a transmitter and a receiver; generating a beamforming matrix in accordance with the channel state information; generating a beamforming steering matrix by multiplying the beamforming matrix by a rotation matrix; and feeding back the beamforming steering matrix.
    Type: Grant
    Filed: July 8, 2009
    Date of Patent: July 10, 2012
    Assignee: Ralink Technology Corporation
    Inventors: Chun Hsien Wen, Jiunn Tsair Chen, Cheng Hsuan Wu, Yen Chin Liao
  • Patent number: 8212727
    Abstract: An antenna and a wireless transceiver are provided. The antenna includes: a substrate having first and second surfaces with circuits thereon; and two shield boxes located on the first and second surfaces for covering the circuits thereon. The shield boxes each comprise an antenna section and a shield section. The antenna sections are disposed at one side of the shield section and aligned with a margin of the substrate, and include signal ends electrically connected to the circuits and grounding ends electrically connected to the shield sections. The first antenna section is disposed on a diagonal opposite of the second antenna section flush with substrate margin or aligned with the substrate margin, thereby maximizing the distance between the two antennas disposed on the substrate, and preventing the two antennas from electromagnetic interference. The antennas are disposed on sides of the shield sections flush with substrate margins and thereby are space-saving.
    Type: Grant
    Filed: April 21, 2009
    Date of Patent: July 3, 2012
    Assignee: Ralink Technology Corporation
    Inventor: Chia-Jui Hsu
  • Publication number: 20120166846
    Abstract: A power management module is configured to set up a power mode of a computer system. A peripheral device having a Universal Serial Bus (USB) is connected to the computer system. The power management module includes an Operating System (OS) and a filter driver. The OS is configured to set up the power mode of the computer system, and the filter driver is configured to change the power mode of the computer system according to a packet transmitting/receiving status of the peripheral device.
    Type: Application
    Filed: December 16, 2011
    Publication date: June 28, 2012
    Applicant: RALINK TECHNOLOGY CORPORATION
    Inventors: PAO CHEN WU, JIH CHUN TSAI, PING WEI WU
  • Patent number: 8207884
    Abstract: A method for detecting radar signals comprises the steps of: receiving signals detected by a master device; receiving signals detected by a slave device; detecting radar pulses from the signals received by the master device; detecting radar pulses from the signals received by the slave device; and determining radar signals by combining the radar pulses detected by the master device and slave device.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: June 26, 2012
    Assignee: Ralink Technology Corporation
    Inventors: Chun Hsien Wen, Chih Kun Chang, Jiunn Tsair Chen
  • Publication number: 20120159339
    Abstract: A method for facilitating selection of objects appearing in a window of a user interface of a wireless control system comprises the steps of: displaying a plurality of client objects in a first connection layer of a first interface; moving the displayed client objects in the first connection layer; selecting a client object from the plurality of client objects in the first connection layer; displaying a plurality of client objects in a second connection layer if the selected client object in the first connection layer connects to client objects in a second connection layer; and establishing the network connection with the selected client object in the first connection layer.
    Type: Application
    Filed: May 26, 2011
    Publication date: June 21, 2012
    Applicant: RALINK TECHNOLOGY CORPORATION
    Inventor: HSIU YUN CHIANG
  • Patent number: 8144823
    Abstract: The present invention discloses a signal processing device and a signal processing method. The signal processing device includes a plurality of receiving devices, a storage module, a weighting module, and a processing module. Each of the receiving devices is capable of receiving an original signal stream, thus the plurality of receiving devices can generate a set of signal streams. The storage module is used for storing a plurality set of signal streams generated by the plurality of receiving devices. The weighting module can generate plurality sets of rotated signal streams according to a reference phase and the plurality sets of signal streams, and further generate a set of weighting signal according to the rotated signal streams. And, the processing module can generate a set of weighting signal streams according to the set of weighting signal and the plurality set of signal streams.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: March 27, 2012
    Assignee: Ralink Technology Corporation
    Inventors: Yun-Shen Chang, Jiunn-Tsair Chen
  • Patent number: 8139428
    Abstract: A method for writing a memory of a block interleaver determines in a bit-wise manner whether to write data into the memory. A method for reading a memory of a block interleaver combines two adjacent columns of the memory into a temporary column and reads data from the temporary column.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: March 20, 2012
    Assignee: Ralink Technology Corporation
    Inventor: Shih Yi Yeh
  • Patent number: 8138853
    Abstract: An RF front-end architecture is operated in either a transmitting or a receiving mode. The RF front-end architecture comprises an antenna, an impedance match network, a balun and a transceiver chip. The transceiver chip comprises first and second transmit/receive (TR) switches, a transmitter, and a receiver. Because two TR switches are integrated into the chip, the printed circuit board area, BOM cost and pin count of the transceiver chip can be greatly reduced.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: March 20, 2012
    Assignee: Ralink Technology Corporation
    Inventor: Chun Hsueh Chu
  • Patent number: 8135032
    Abstract: A rate adaptation method comprises the steps of: updating the probability density function of the SNR of a transmitted signal according to the receiving status of the transmitted signal and the probability density function before update; and updating the transmission rate of the transmitted signal according the updated probability density function.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: March 13, 2012
    Assignee: Ralink Technology Corporation
    Inventors: Yung Szu Tu, Jiunn Tsair Chen
  • Patent number: 8130788
    Abstract: A method for adjusting a transmission speed of a wireless network comprises the steps of: setting a transmission mode, wherein the transmission mode is either an idle mode or a traffic mode; setting an environmental case, wherein the environmental case is either an ideal case or a corner case; determining a transmission speed adjusting algorithm according to the transmission mode and environmental case; and determining an updated transmission speed according to the transmission speed adjusting algorithm.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: March 6, 2012
    Assignee: Ralink Technology Corporation
    Inventor: Chu Hsin Tsao
  • Patent number: 8126095
    Abstract: A multi input multi output (MIMO) receiver for receiving signals having a plurality of equalizers being responsive to aligned signals for processing the same to generate a plurality of equalized outputs using filter coefficients, in accordance with an embodiment of the present invention. The MIMO receiver for training said plurality of equalizers to adapt said filter coefficients for generating said plurality of equalized outputs, said MIMO receiver for combining said plurality of equalized outputs in time domain to generate a weighted output, said MIMO receiver for improving the quality of said weighted output by performing equalization prior to combining said plurality of equalized outputs.
    Type: Grant
    Filed: October 20, 2006
    Date of Patent: February 28, 2012
    Assignee: Ralink Technology Corporation
    Inventor: Thomas Edward Pare, Jr.
  • Patent number: 8098687
    Abstract: A method for forwarding packets first checks a forwarding table of a bridge to find whether the destination information for a packet is included in the forwarding table. If the information is found, this packet is forwarded to the destination through a physical layer directly without passing through the bridge. This method improves the efficiency of the frame aggregation of an AP (Access Point) and enhances the throughput in a WLAN (Wireless Local Area Network).
    Type: Grant
    Filed: July 8, 2009
    Date of Patent: January 17, 2012
    Assignee: Ralink Technology Corporation
    Inventors: Ming Ta Li, Shen Po Lin
  • Patent number: 8085777
    Abstract: The present invention provides a packet-processing apparatus for receiving and processing N packets in a series, wherein N is a natural number, and each of the packets has a current header. Additionally, the packet-processing apparatus includes an agent, a processing unit, a monitoring unit, a lookup table, and a control unit. Particularly, the packet-processing apparatus according to the invention can process the N packets effectively and flexibly.
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: December 27, 2011
    Assignee: Ralink Technology Corporation
    Inventor: Kuo-Cheng Lu
  • Publication number: 20110295080
    Abstract: A physiology condition detection device comprises a physiology condition sensor, a signal converter and an RFID processor. The physiology condition sensor is configured to sense physiology condition. The signal converter is configured to convert the sensed physiology condition to digitized physiology data. The RFID processor is configured to control the operation of the physiology condition sensor and the signal converter, and report the digitized physiology data.
    Type: Application
    Filed: May 27, 2011
    Publication date: December 1, 2011
    Applicant: Ralink Technology Corporation
    Inventors: Bo Yung Chen, Bing Jye Kuo, Heng Chih Lin