Patent application number | Description | Published |
20090125653 | ASSOCIATION USING USB VIDEO ADAPTER - Certified Wireless USB 1.0 (CWUSB) defines two different types of association: cable association and numeric association. In the numeric association, the CWUSB host and device use a specific protocol to exchange the security information. At final stage of this information exchange, both host and device need to display a number asking user's feedback. Once this is done, both host and device will be able to generate the connection key as the shared secret for the following secured communication. One problem of this numeric association method is that device needs to be able to display the numbers. For certain class of device that has capability to display an image, there is a natural way to add this function to them. A method for this class of devices is described. Another kind of association, which is not defined in the CWUSB 1.0, is manual association. User needs only to manually type in the Connection Key coming from the CWUSB device. There are many ways to delivery the key, but it is very easy for device that can display an image. | 05-14-2009 |
20090125658 | CWUSB HOST MANAGEMENT SYSTEM - Universal Serial Bus (USB) is a Master/Salve or Host/Device system in which there is only one host and one or more devices connected by cables to the host. To connect a USB device to a different host controller (say another PC), the user unplugs the USB cable and establishes the connection physically by plugging the cable into the new host controller interface. Certified Wireless USB (CWUSB), a logical extension to the USB, preserves the USB connection model, except that the link between the host and the device is now using a wireless technology. A wireless device is usually connected to only one wireless host at a given point of time, even though several wireless hosts may be co-located in the same physical neighborhood. The connection between the wireless host and device is initiated by the device. A device usually selects a wireless host from a stored set of known hosts that have established a trusted relationship with the device. If more than one wireless host is operating in the same neighborhood, there is no well known established procedure for the device to select a particular wireless host to establish a connection. | 05-14-2009 |
20090132738 | PRE-ASSOCIATION FOR CWUSB - Certified Wireless USB 1.0 defines two different types of association: cable association and numeric association. In order to implementation these two association methods, the CWUSB device needs to have either upstream USB connector (for cable association) or display capability (for numeric association). These extra requirements make the CWUSB device bulkier (one more USB connector) and/or more expensive (extra display components). For cheap and simple CWUSB devices, we need a simpler association method that is easy and cheap to implement. In a pre-packaged total solution, which includes a host and one or more device(s), we can use pre-association to smooth the user experience. The host and device(s) are pre-associated. When an end user starts to use this solution, they do not need to worry about the association at all. | 05-21-2009 |
Patent application number | Description | Published |
20080207156 | DETECT-AND-AVOID METHOD AND ARCHITECTURE FOR ULTRA-WIDEBAND SYSTEM - A method and system for detecting the presence of narrowband transmitters utilizing frequencies also utilized by wider band communication systems. In some embodiments an ultrawideband transceiver detects signals at specific frequencies within a spectrum of frequencies, and analyzes the signals to determine if the signals indicate transmissions by a narrowband transmitter in a narrowband communication system. In further embodiments transmission circuitry reduces signal components at frequencies occupied by the narrowband transmitters. | 08-28-2008 |
20110158291 | Automatic Gain Control for Frequency-Hopped OFDM - An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol. | 06-30-2011 |
20120140794 | Automatic Gain Control for Frequency-Hopped OFDM - An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol. | 06-07-2012 |
20120220249 | Dynamic AC-Coupled DC Offset Correction - Systems are disclosed that utilize AC-coupled filtering to reduce DC offset, with aspects dynamically correcting instantaneous DC offset generated from the AC-coupled filtering. A DC offset correction circuit for an radio frequency (rf) receiver, comprising a switchable high pass filter configured to receive a signal, the switchable high pass filter including a plurality of high pass filters connected in parallel, wherein at least one of the plurality of high pass filters has a tunable corner frequency. | 08-30-2012 |
20120238231 | Dynamic AC-Coupled DC Offset Correction - A method, using an AC-coupled filter, reduces DC offset in a downconverted signal in a wireless receiver receiving a signal including a preamble, the method including: changing the corner frequency of the AC-coupled filter a plurality of times during reception of the preamble. In another implementation, a receiver includes a DC offset correction system. The receiver includes a mixer downconverting a received signal to form a downconverted signal; a first AC-coupled high pass filter having an input in at least one-way data communication with the mixer, the first AC-coupled high pass filter having a switchable corner frequency dependent on a frame state of a received signal; and a plurality of second AC-coupled high pass filters coupled to an output of the first AC-coupled high pass filter, each of the plurality of second AC-coupled high pass filters have a switchable corner frequency. | 09-20-2012 |