Patent application number | Description | Published |
20080205317 | Link Establishment in a Wireless Communication Environment - The invention relates to link establishment in a wireless communication terminal. In order to obtain flexible and low power connections between a wireless terminal belonging to a short-range wireless network and an external wireless communication device not belonging to that network, a protection frame is sent either from the wireless communication terminal or from the external wireless communication device. The protection frame includes duration information used for virtual carrier-sensing in the short-range wireless network. In response to the protection frame, data is transferred between the wireless communication terminal and the external wireless communication device during a time period indicated by the duration information. | 08-28-2008 |
20080293445 | Radio frequency apparatus - A radio frequency apparatus comprising an interface configured to receive a command from a radio protocol stack. A command generator configured to generate a plurality of commands from said received command is provided. The apparatus also has configurable hardware, said hardware having a configuration which is controlled in dependence on said generated commands and being arranged to at least one of transmit and receive a radio frequency signal. | 11-27-2008 |
20080294362 | Calibration method and calibration manager - A calibration manager comprises means for receiving information relating to the calibration of at least one component. Means for setting a trigger condition for executing a calibration in dependence on said received information is provided. Means are provided for executing said calibration in dependence on said trigger condition. | 11-27-2008 |
20090093257 | VARIABLE BANDWIDTH IN A COMMUNICATION SYSTEM - A method, device, and system that use narrowband channels to provide higher re-use without multiplying the operator spectrum requirement. If a communication system supports variable carrier bandwidth channels, the narrow channel capacity can be divided among adjacent cells to provide higher re-use. | 04-09-2009 |
20090195425 | Method and device for digital-to-analog conversion with filtering - The invention relates to a device and a method for converting a digital signal having a plurality of data-bits into a filtered analog signal. A device according to the invention includes a delay element arranged to produce one or more differently delayed version of the digital signal and a digital-to-analog conversion circuitry arranged to convert the digital signal and the one or more differently delayed, and possibly differently scaled, versions of the digital signal into analog signals and to produce the filtered analog signal as a combination of the analog signals. Therefore, the device constitutes not only a digital-to-analog-converter but also a finite impulse response filter. | 08-06-2009 |
20090197626 | Method and apparatus to operate a cognitive radio in a crowded collaborative system - In a cognitive radio environment with at least three cognitive radio terminals, terminals | 08-06-2009 |
20090253376 | Method, apparatus and computer program for sensing spectrum in a cognitive radio environment - To find frequency slots over which a cognitive radio can send an opportunistic transmission, a wideband spectrum is searched with a lower resolution to identify bandwidth slices having low or no signal levels. The identified bandwidth slices are searched with a higher resolution and candidate frequency slices are selected as those bandwidth slices having the least signal levels after the higher resolution searching, and ranked from the lowest signal level to the highest. A spectrum detection algorithm is executed on the selected candidate frequency slices in the order of the rank until it is decided that one of them has sufficiently free spectrum. A transmission is then opportunistically sent on the decided candidate frequency slice. Ongoing to the searching, intermittent signals are detected and a band about them is searched with the lower resolution to determine if the band about the detected intermittent signal is an identified bandwidth slice. Various techniques are shown for how the fine search is conducted. | 10-08-2009 |
20100109714 | Frequency synthesizer having a plurality of independent output tones - Described is an apparatus that includes a frequency source and a plurality of time domain direct digital synthesizers each having an input connected to an output of the frequency source and an output providing an output frequency signal. A particular time domain direct digital synthesizer includes a sigma-delta modulator that functions as a second order multi-stage noise shaping sigma-delta modulator. In one exemplary embodiment sigma-delta modulator outputs provide a unitary-weighted word used to switch certain unit capacitors that comprise part of a delay modulator to produce a time-varying delay having a time-averaged value that directly corresponds to a binary value appearing on a plurality of phase accumulator outputs. | 05-06-2010 |
20110009069 | RADIO FREQUENCY APPARATUS - An apparatus for controlling at least one radio module, wherein the apparatus is configured to generate at least one service request for a first radio mode, determine at least one logical architecture model dependent on each service request, select at least one of the plurality of radio modules to form a physical architecture structure dependent on each logical architecture model, and generate at least one configuration data set dependent on the selected one of the plurality of radio modules. | 01-13-2011 |
20120154092 | Apparatus and Associated Methods - An apparatus including a coil configured to allow a flow of electrical current therethrough to generate a magnetic field, and a composite material configured to increase the strength of the magnetic field relative to that which could be generated by the coil without the composite material, the composite material including a plurality of magnetic particles having a mean maximum dimension of less than 100 nm dispersed within a dielectric binder. | 06-21-2012 |
20130114662 | METHOD AND APPARATUS FOR RADIO RECEIVER EQUALIZATION - A method, apparatus and computer program product are configured to provide calibration accuracy in an analog filter. In this regard, a method is provided that includes estimating a cutoff frequency for an analog filter. The method further includes causing a filter tuning word to be modified based on the estimated cutoff frequency for the analog filter. The method also includes determining a residual cutoff frequency mismatch for the analog filter. The method also includes causing an equalizer configuration to be selected for a digital filter based on the determined residual cutoff frequency mismatch. | 05-09-2013 |
20140185567 | Link Establishment In A Wireless Communication Environment - A mechanism facilitates the establishment of connections between a wireless communication terminal belonging to a short-range wireless network and an external wireless communication device not belonging to the short-range wireless network. Virtual carrier sensing is employed to protect a connection between the wireless communication terminal and the external wireless communication device. When the connection is to be established, the wireless communication terminal sends a protection frame indicating to other members of the network that the common medium is reserved, thus protecting the link to the external wireless communication device. | 07-03-2014 |