Class / Patent application number | Description | Number of patent applications / Date published |
455103000 | Plural separate transmitters or channels | 23 |
20080207143 | Radio communications using scheduled power amplifier backoff - Radio transmissions to multiple radio terminals are improved using scheduled backoff of a multi-signal power amplifier. A radio channel quality associated with each of the radio terminals is determined. First signals for first radio terminals associated with a better channel quality are amplified by a power amplifier during a first time period resulting in a first composite output signal. Second signals for second radio terminals associated with a lower channel quality are amplified by the power amplifier during a second time period resulting in a second composite output signal. Transmission during the first time period occurs at a first power level, e.g., mean power, that is associated with a lower probability of clipping the first composite output signal. During the second time period, the second composite signal is transmitted at a second power level, e.g., mean power, higher than the first power level which improves reception at the second terminals. | 08-28-2008 |
20080233897 | METHOD AND SYSTEM FOR SIMULTANEOUS FM TRANSMISSION ON A SELECTED CHANNEL AND ITS CORRESPONDING IMAGE FREQUENCY - Aspects of a method and system for simultaneous signal transmission on multiple selected frequencies may include generating from a single baseband signal, a plurality of radio frequency transmission signals each at a different radio frequency, wherein the single baseband signal comprises an in-phase signal component and/or a quadrature signal component. The single baseband signal, to generate said plurality of radio frequency transmission signals, may be modulated in a single radio frequency transmission chain, the radio frequency transmission chain comprising intermediate frequency modulation and radio frequency modulation. The plurality of radio frequency transmission signals may be a radio frequency signal and a corresponding image frequency signal, based on the intermediate frequency modulation and the radio frequency modulation. The signals resulting from the intermediate frequency modulation and the radio frequency modulation may be filtered to preserve the radio frequency signal and the corresponding image frequency signal. | 09-25-2008 |
20080299917 | CLOSED-LOOP MULTIPLE-INPUT-MULTIPLE-OUTPUT SCHEME FOR WIRELESS COMMUNICATION BASED ON HIERARCHICAL FEEDBACK - The present invention provides methods implemented in a base station having a plurality of antennas and one or more user terminals. One embodiment of the method includes receiving feedback from at least one user in response to transmitting a first frame to said at least one user. The first frame is formed by pre-coding at least one symbol using at least one first code word selected from at least one first code book associated with the at least one user. The method also includes transmitting at least one second frame to the user(s). The second frame(s) are pre-coded using at least one second codeword selected from at least one second codebook. The second codebook(s) determined based on the feedback and the first codeword(s). | 12-04-2008 |
20080299918 | Cognitive radio terminal - A cognitive telecommunication terminal designed to coexist with a primary telecommunication system using a set (B) of transmission frequencies comprising a plurality of spatially distributed transmitters, each transmitter being suitable for transmitting within a coverage area in a plurality of frequency bands in said set allocated to the transmitter. The terminal comprises positioning means, a database storing information defining the coverage area for each transmitter, calculation means suitable for determining the maximum power that the terminal can transmit for each frequency band in said set, and for sorting frequency bands as a function of the maximum powers thus obtained. Finally, the terminal comprises radio transmission/reception means suitable for detecting the presence of a signal in the frequency bands thus sorted, beginning with the frequency band associated with the highest maximum power. | 12-04-2008 |
20090111395 | PROVIDING A VIRTUAL LOCAL CHANNEL IN A SATELLITE BROADCAST SYSTEM - In one embodiment, a receiver for providing a virtual local channel in a broadcast radio system that transmits a plurality of sets of local content corresponding to a plurality of different geographic regions is disclosed. The receiver includes a detector (e.g., | 04-30-2009 |
20090203335 | APPARATUS AND METHOD FOR PARTIAL ADAPTIVE TRANSMISSION IN MULTIPLE-INPUT MULTIPLE-OUTPUT SYSTEM - An apparatus and method for partial adaptive transmission in a Multiple-Input Multiple-Output (MIMO) system are provided. The method includes estimating a correlation matrix between Transmit (Tx) antennas and an average Signal to Noise Ratio (SNR) and generating a long-term precoding matrix composed of a predetermined number of dominant eigen dimensions of the correlation matrix by using the estimated correlation matrix and average SNR. The apparatus and method provide a new adaptive MIMO transmission method capable of reducing the feedback information overhead and maximizing performance. | 08-13-2009 |
20090221244 | Method And System For Selecting, Transmitting, And Receiving An Unused Carrier Frequency And Transmitting Over The Unused Carrier Frequency - In some embodiments, a method of transmitting electrical signals over at least one unused first frequency includes: (a) using a first electrical device to receive information identifying the at least one unused first frequency; (b) selecting a first transmission frequency from the at least one unused first frequency; (c) communicating the first transmission frequency to a user; and (d) using the transmitter of the first electrical device to broadcast the electrical signals over the first transmission frequency. Other embodiments are disclosed in this application. | 09-03-2009 |
20100062732 | RECEIVING-TRANSMISSION APPARATUS AND METHOD OF SWITCHING TRANSMISSION ANTENNA IN TRANSMISSION SWITCHED DIVERSITY SYSTEM - Provided are a transmission/receiving apparatus and method of switching a transmission antenna in a Transmission Switched Diversity (TSD) system. The transmission apparatus includes an announcement command frame reading unit to verify a TSD Information Element (IE) included in an announcement command frame when receiving the announcement command frame from a receiving apparatus, and to verify whether to request a switching of the transmission antenna, an antenna switching unit to select an antenna, not being selected from a plurality of antennas, as a transmission antenna when the announcement command frame requests the switching of the transmission antenna, and to switch a currently used antenna into the selected transmission antenna, and an announcement command frame generation unit to convert transmission antenna information included in the TSD IE into the selected transmission antenna, and to generate a response announcement command frame including the converted TSD IE and transmit to the receiving apparatus. | 03-11-2010 |
20100120380 | METHOD FOR COMMUNICATING WITH OTHER RADIO APPARATUSES AND RADIO APPARATUS USING THE METHOD - A processing unit receives the input of image data sequentially. A specifying unit specifies a synchronization period for the sequentially inputted image data. A measurement unit measures the characteristics of a radio channel over the specified synchronization period. The processing unit stores the measured characteristics of a radio channel in radio packets and transmits the radio packets storing the measured characteristics to other radio apparatuses, and also stores the sequentially inputted image data in the radio packets and transmits the radio packets storing the image data to the other radio apparatuses. | 05-13-2010 |
20100285760 | Reducing Power Consumption on Multi-Transmitter Devices - In an example embodiment, there is disclosed an apparatus comprising a first transmitter, a second transmitter, and logic coupled to the first transmitter and the second transmitter. The logic is operable to limit a time period the second transmitter is able to transmit while the first transmitter is transmitting. | 11-11-2010 |
20110034135 | TRANSMISSION CONTROL FOR A SPECIFIC ABSORPTION RATE COMPLIANT COMMUNICATION DEVICE - Transmission of data from a portable communication device to a station via a radio frequency signal uses a protocol that has recurring frames, each having a plurality of transmission slots, different numbers of which can be used to transmit the data. When the portable communication device desires to send a data transmission, a first value is selected for either a power level for the radio frequency signal or the number of transmission slots to use. Then the first value is used to select a second value for the other one of the power level and the number of transmission slots. The first and second values are selected so that the data transmission at the selected power level using the selected number of transmission slots does not result in a specific absorption rate that is greater than a specific absorption rate limit. | 02-10-2011 |
20110081876 | DEVICE WITH DUAL-BAND ANTENNA TUNED BY TANK NETWORK - A communication device having an antenna tuned by a tank network at its input port to realize dual-band resonance. The antenna alone has a wideband but weak resonance, while the device antenna circuit with the tank network has a narrowband resonance between the two desired frequencies when the antenna is open-circuited. Together, the device antenna circuit with the tank network and antenna realize dual narrowband resonance at the two desired frequencies. | 04-07-2011 |
20120021707 | APPARATUS AND METHOD FOR ADJUSTMENT OF TRANSMITTER POWER IN A SYSTEM - Certain aspects of the present disclosure propose methods for determining power level of one or more transmitters based on a power level of a primary transmitter when the transmitters are located in close proximity of each other. The power levels may be determined such that a combined power of all the transmitters is compliant with regulatory radio frequency (RF) safety requirements. For certain aspects, power level of the lower priority transmitters may be determined utilizing one or more look-up tables. For another aspect, power level of the lower priority transmitters may be calculated using an algorithm based on the power level of the priority transmitter. In aspects, the power level of lower priority transmitters and the time duration for which the transmitters are active may be selected dynamically so that the time averaged power of the transmitters for a defined period of time falls below the RF exposure limit. | 01-26-2012 |
20120184228 | DYNAMIC TRANSMIT CONFIGURATIONS IN DEVICES WITH MULTIPLE ANTENNAS - Electronic devices may have multiple wireless integrated circuits such as a pair of baseband processor integrated circuits and may have multiple antennas such as a pair of antennas. An electronic device may be operated in different modes depending on the operating environment of the electronic device. When both antennas are unblocked, both baseband processors and both antennas may be used in transmitting signals. When one antenna is not available, the device may be operated in a mode in which the available antenna is used and both baseband processors are used or in a mode in which the available antenna is used and only one of the baseband processors is used. Operating mode decisions may be made so as to minimize the potential for intermodulation distortion and absorbed radiation. | 07-19-2012 |
20120190316 | Radio Frequency Splitter - A multichannel splitter formed from 1 to 2 splitters, wherein: an input terminal of a first 1 to 2 splitter defines an input of the multichannel splitter; the 1 to 2 splitters are electrically series-connected; and first respective outputs of the 1 to 2 splitters define output terminals of the multichannel splitter. | 07-26-2012 |
20120190317 | RADIO FREQUENCY COMBINER - A multichannel combiner formed from 2 to 1 combiners, wherein: a first input channel of each 2 to 1 combiner is connected to the output of a settable-gain amplifier of a signal to be combined; all 2 to 1 combiners are electrically connected in series; and an output of a first 2 to 1 combiner defines an output of the multichannel combiner. | 07-26-2012 |
20120309332 | RF Processing Circuit and Wireless Communication Device Using the Same - A radio-frequency (RF) processing circuit used in a wireless communication device is disclosed. The RF processing circuit comprises an RF front-end circuit, coupled to a first antenna, a second antenna, a first wireless communication module and a second wireless communication module, for switching couplings between the first antenna and the second antenna, and the first wireless communication module and the second wireless communication module according to a control signal; and a control unit, for generating the control signal to the RF front-end circuit according to operation frequency bands and operation conditions of the first wireless communication module and the second wireless communication module. | 12-06-2012 |
20130012146 | TRANSMITTER - To provide a transmitter wherein even in a case of sharing a detector circuit between or among a plurality of transmitting circuits, a high degree of detection accuracy can be achieved without increasing the signal power supplied to the detector circuit. In a transmitter including a detector circuit shared by transmitting circuits and that deal with signals of different frequency bands, a capacitor C | 01-10-2013 |
20140248843 | Apparatus and Method for Use with Antenna Array - Embodiments of the present invention provide an apparatus ( | 09-04-2014 |
20140335804 | TRANSMITTER FOR SUPPORTING MULTIMODE AND MULTIBAND USING MULTIPLE RADIO FREQUENCY (RF) DIGITAL-TO-ANALOG CONVERTERS (DAC) AND CONTROL METHOD OF THE TRANSMITTER - A transmitter configured to support a multimode and a multiband, using radio frequency (RF) digital-to-analog converters (DACs), includes a first RF DAC configured to transmit a first signal in a first frequency band, and a second RF DAC configured to transmit a second signal in a second frequency band different from the first frequency band. The transmitter further includes an impedance controller configured to adjust impedance of one of the first RF DAC and the second RF DAC operating in an impedance matching mode to adjust a frequency range of another one of the first RF DAC and the second RF DAC operating in a data transmission mode. | 11-13-2014 |
20140370829 | TRANSMISSION SYSTEM AND CONTROL METHOD OF SAME - A transmission system of an embodiment is provided with an active transmitter, a backup transmitter, and a system controller to integrally control the active transmitter and the backup transmitter. The backup transmitter is provided with a setting table which stores a setting value relating to a frequency and a level of a signal outputted from the active transmitter, a power amplifier to amplify an input signal and output an amplified signal, and a modulator/exciter which converts, based on the setting table, the input signal into a modulation signal of a prescribed broadcast type in which nonlinear distortion by the power amplifier has been compensated. The system controller, at the time of adjusting the output level of the active transmitter, controls the backup transmitter so that content of the setting table of the backup transmitter becomes a setting value corresponding to the adjusted output level. | 12-18-2014 |
20150382307 | DETECTING PROXIMITY USING ANTENNA FEEDBACK - An electronic device provides a detuning monitor circuit configured to detect a change in a voltage standing wave ratio (VSWR) between a radio frequency (RF) transmitter and an RF antenna relative to a predetermined VSWR baseline and a proximity detector circuit configured to adjust transmission power of a carrier wave transmitted from the RF transmitter, if the change fails to satisfy an acceptable VSWR condition. Network proximity detectors are also provided to allow coordination of antenna subsystems to comply with specific absorption rate (SAR) constraints and/or maintain/improve antenna performance. | 12-31-2015 |
20170237475 | PHASE SHIFT CIRCUIT, PHASED ARRAY DEVICE, AND PHASE CONTROL METHOD | 08-17-2017 |