Patent application number | Description | Published |
20090042615 | Method for Selecting Antennas in a Wireless Networks - A method and system selects antennas in a wireless network including a base station and user equipment (UE) transceivers. The base station specifies times and frequencies to transmit sounding reference signals (SRSs), and antennas to use to transmit the SRSs for the specified times and frequencies. The transceivers transmit the SRS according to the specified times, frequencies, and antennas. The base station selects subsets of the set of available sets of antennas, and indicates the selected subset of antennas to the transceiver. | 02-12-2009 |
20090042616 | Method for Implicit Selecting Antennas in a Wireless Networks - A method and system selects antennas in a wireless network including a base station and user equipment (UE) transceivers. The base station specifies times and frequencies to transmit sounding reference signals (SRSs), and antennas to use to transmit the SRSs for the specified times and frequencies. The transceivers transmit the SRS according to the specified times, frequencies, and antennas. The stopping and starting of the SRS are specified implicitly. The base station selects subsets of the set of available sets of antennas, and indicates the selected subset of antennas to the transceiver. | 02-12-2009 |
20090074088 | Adaptive Fragmentation for HARQ in Wireless OFDMA Networks - A method performs a hybrid automatic repeat-request (HARQ) operation in a wireless orthogonal frequency division multiple access (OFDMA) network. A quality of a channel between a transmitter and a receiver is estimated as an error metric. A packet for the HARQ operation is fragmented adaptively at the transmitter according to the estimated error metric. The fragmentation is performed at the HARQ layer when the error metric is less than a predetermined threshold, otherwise the fragmentation is performed at the MAC layer. | 03-19-2009 |
20090080556 | Reducing Peak-to-Average-Power-Ratio in OFDM/OFDMA Signals by Deliberate Error Injection - A method and system reduces a peak to average power ratio of a transmitted OFDM signal. An input signal is encoded using a forward error correcting code to produce a codeword corresponding to the input signal. A peak power corresponding to the codeword is measured. The peak power is compared with a predetermined threshold, and a set of selected bits in the codeword are manipulated if the peak power is greater than the predetermined threshold to deliberately produce an erroneous codeword in which the peak power is less than the predetermined threshold, which is transmitted. | 03-26-2009 |
20090088176 | Method for Reducing Inter-Cell Interference in Wireless OFDMA Networks - Protocols for OFDM/OFDMA/SC-FDMA based wireless networks provide adaptive inter-cell interference management without explicit spectrum or frequency planning. Base stations and mobile stations acquire information about subcarrier allocation from a handoff protocol. The mobile stations can also acquire this information using cognitive sensing. Cognitive sensing can be rewarded by the base station. Using this information, subcarriers can be allocated randomly, with blind optimization, or by joint optimization. The stations can use game theory to select among the different optimization strategies. | 04-02-2009 |
20090201867 | Method for Allocating Resources in Cell-Edge Bands of OFDMA Networks - A method allocates bandwidth from a radio frequency spectrum in a cellular network including a set of cells. Each cell includes a base station for serving a set of mobile stations in the cell. An area around each base station is partitioned into a center region and an edge region. In each base station, cell-center bandwidth for use by the mobile stations in the center region is reserved according to an inter-cell interference coordination (ICIC) protocol, and cell-edge bandwidth for use by the mobile stations in the edge region is reserved according to the ICIC protocol. The bandwidth can be fixed or adaptive to reduce the signaling overhead. The adaptive bandwidth can be further partitioned into reserved and the free bands. Mobile stations are classified as primary and secondary users, depending on whether they use or are assigned the fixed or adaptive band radio resources. | 08-13-2009 |
20090213966 | System and Method for Generating Soft Output in Hybrid MIMO Systems - A hybrid soft output MIMO detector uses a QR decomposition detector followed by a Markov chain Monte Carlo detector. The QRD-M generates initial candidate decision vectors, which are used as input for the Markov chain Monte Carlo detection to generate the soft output. | 08-27-2009 |
20090247229 | Method for Selecting Antennas in a Wireless Networks - A method selects antennas in a wireless network including a base station and one or more transceivers. The base station specifies times, subcarriers and subsets of antennas to use to transmit sounding reference signals (SRS) to the base station. Then, the transceiver transmits the SRS according to the specified times and subcarriers using different subsets of the set antennas. The SRS are received in the base station, and the base station selects one of the different subset of the antennas based on the received SRS, and indicates the selected subset of the antennas to the transceiver. | 10-01-2009 |
20090274110 | Method and System for Generating Antenna Selection Signals in Wireless Networks - Embodiments of the invention describe a method for antenna selection (AS) in a wireless communication network, the network comprising user equipment (UE), wherein the UE comprises a plurality of subsets of antennas including a selected subset of antennas and an unselected subset of antennas, wherein only the selected subset of antennas is used for transmitting user data, and wherein the UE is configured to transmit only from a subset of antennas at a time. The method transmits the user data from the selected subset of antennas within a set of subframes, and transmits a sounding reference signal (SRS) from the unselected subset of antennas within at least one subframe in the set of subframes to enable antenna selection for user data transmission. | 11-05-2009 |
20090278742 | Antenna Selection with Frequency-Hopped Sounding Reference Signals - The embodiments of the invention describe a method for antenna selection in a wireless communication network. The network includes a transceiver having a set of antennas. The transceiver is configured to transmit a frequency-hopped sounding reference signal (SRS) over a subband from a subset of antennas at a time. The transceiver transmits the frequency-hopped SRS from subsets of antennas in the set of antennas substantially alternately. In response to the transmitting, the transceiver receives information indicative of an optimal subset of antennas and transmits data from the optimal subset of antennas. | 11-12-2009 |
20090279447 | Antenna Selection with Frequency-Hopped Sounding Reference Signals - The embodiments of the invention describe a method for antenna selection in a wireless communication network. The network includes a transceiver having a set of antennas. The transceiver is configured to transmit a frequency-hopped sounding reference signal (SRS) over a subband from a subset of antennas at a time. The transceiver transmits the frequency-hopped SRS from subsets of antennas in the set of antennas alternately. In response to the transmitting, the transceiver receives information indicative of an optimal subset of antennas and transmits data from the optimal subset of antennas. | 11-12-2009 |
20090303955 | Method and System for Generating Antenna Selection Signals in Wireless Networks - Embodiments of the invention describe a method for antenna selection (AS) in a wireless communication network, the network comprising user equipment (UE), configured to transmit a sounding reference signal (SRS) from a subset of antennas at a time without transmitting user data. The method transmits a first SRS from a first subset of antennas in a first subframe, wherein the first subframe does not include the user data, and transmits a second SRS from a second subset of antennas in a second subframe, wherein the second subframe does not include the user data. After receiving, in response to the transmitting the first SRS and the second SRS, information identifying an optimal subset of antennas from the first subset of antennas and the second subset of antennas, the method selects the optimal set of antennas such that the optimal subset of antennas is selected without transmitting the user data. | 12-10-2009 |
20100002649 | Method and System for Generating Antenna Selection Signals in Wireless Networks - Embodiments of the invention describe a method for antenna selection (AS) in a wireless communication network, the network comprising user equipment (UE), wherein the UE comprises a plurality of subsets of antennas including a first subset of antennas and a second subset of antennas, and wherein the UE is configured to transmit a sounding reference signal (SRS) from a subset of antennas at a time. The method transmits a first SRS from the first subset of antennas, transmits a second SRS from the second subset of antennas, receives, in response to the transmitting the first SRS and the second SRS, information identifying an optimal subset of antennas from the first subset of antennas and the second subset of antennas, and transmits user data from the optimal subset of antennas. | 01-07-2010 |
20100002657 | Method and System for Generating Antenna Selection Signals in Wireless Networks - Embodiments of the invention describe a method for joint resource blocks assignment and antenna selection (AS) in a wireless communication network, the network comprising user equipment (UE), wherein the UE comprises a plurality of subsets of antennas, the UE is configured to transmit a sounding reference signal (SRS) from a subset of antennas at a time. The method transmits a first SRS from a first subset of antennas and a second SRS from a second subset of antennas. Upon receiving, in response to the transmitting of the first SRS and the second SRS, information related to an optimal subset of antennas, and information related to an optimal subset of resource blocks, the method transmits a data symbol from the optimal subset of antennas using the optimal resource block. | 01-07-2010 |
20100081441 | Dynamic Radio Frequency Allocation for Base Station Cooperation with Interference Management - A method allocates bandwidth from a radio frequency spectrum in a cellular network including a set of cells. Each cell includes a base station for serving a set of mobile stations in the cell. An area around each base station is partitioned into a center region and a boundary region. In each base station, bandwidth for use in the center region is reserved according to an inter-cell interference coordination (ICIC) protocol, and bandwidth for use in the boundary region is reserved according to the ICIC protocol and a base station cooperation (BSC) protocol. Then, the bandwidth is allocated to mobile stations as the mobile stations communicate with the base station in the center regions and the boundary regions according to the bandwidth reservations. | 04-01-2010 |
20100197314 | System and Method for Opportunistic Cell Edge Selection in Multi-Cell MIMO OFDMA Networks - A method for allocating resources in an orthogonal frequency division multiple access (OFDMA) network, where each cell in the network has a center region and an edge region. The cell center region uses a frequency band orthogonal to the frequency band used by the cell edge region. The frequency band is made up of resource blocks (RBs) or non-overlapping sets of subcarriers. Upon availability of cell-center RBs, cell-center user equipment (UEs) are assigned resource blocks. A fixed number of cell edge regions from a few adjacent cells form a cluster, and only the cell edge regions with the highest achievable throughput rate within each cluster gets to transmit in a given scheduling instance. | 08-05-2010 |
20100220670 | Method for Scheduling to Reduce Inter-Cell Interference for Voice Communication in OFDMA - A method schedules voice communication in an Orthogonal Frequency Division Multiplexing Access (OFDMA) network of base stations serving sets of mobile stations in cells. The method uses statistical characteristics of voice communications by adjusting scheduling periods accordingly to measurement reports provided by the mobile stations. The base stations generally use persistent scheduling for voice transmission due to inherent characteristics, along with extra signaling concerns. Base stations have the liberty of shortening or prolonging the scheduling period according to their needs while taking into account changes in dynamic conditions. This method makes use of the measurement reports provided by the mobile stations along with a shortened scheduling period in order to reduce ICI. | 09-02-2010 |
20100220707 | Method for Detecting Hidden Nodes in Cognitive Radio Networks - The invention and method provides a concise model for signaling over control channel of cognitive radio. The model is analyzed and simulated for optimum parameters of wireless network. The optimized network parameters facilitate improvement of channel usage for cognitive wireless network leading to bandwidth efficiency. | 09-02-2010 |
20100246638 | Antenna Selection with Frequency-Hopped Sounding Reference Signals - Embodiments of the invention describe a method for antenna selection (AS) in a wireless communication network. The network includes a base station and a transceiver, wherein the transceiver has a set of antennas, and wherein the transceiver is configured to transmit a frequency-hopped sounding reference signal (SRS) from a subset of antennas at a time. The base station determines a type of a training transmission based on a number of the subbands and a number of subsets in the set of antennas, and transmits an instruction including the type to the transceiver. | 09-30-2010 |
20110133564 | Wireless Energy Transfer with Negative Index Material - Embodiments of the invention disclose a system configured to exchange energy wirelessly. The system includes a structure configured to exchange the energy wirelessly via a coupling of evanescent waves, wherein the structure is electromagnetic (EM) and non-radiative, and wherein the structure generates an EM near-field in response to receiving the energy; and a negative index material (NIM) arranged within the EM near-field such that the coupling is enhanced. | 06-09-2011 |
20110133565 | Wireless Energy Transfer with Negative Index Material - Embodiments of the invention disclose a system configured to exchange energy wirelessly. The system includes a structure configured to exchange the energy wirelessly via a coupling of evanescent waves, wherein the structure is electromagnetic (EM) and non-radiative, and wherein the structure generates an EM near-field in response to receiving the energy; and a negative index material (NIM) arranged within the EM near-field such that the coupling is enhanced. | 06-09-2011 |
20110133566 | Wireless Energy Transfer with Negative Material - Embodiments of the invention disclose a system configured to exchange energy wirelessly. The system includes a structure configured to exchange the energy wirelessly via a coupling of evanescent waves, wherein the structure is electromagnetic (EM) and non-radiative, and wherein the structure generates an EM near-field in response to receiving the energy; and a negative index material (NIM) arranged within the EM near-field such that the coupling is enhanced. | 06-09-2011 |
20110133567 | Wireless Energy Transfer with Negative Index Material - Embodiments of the invention disclose a system configured to exchange energy wirelessly. The system includes a structure configured to exchange the energy wirelessly via a coupling of evanescent waves, wherein the structure is electromagnetic (EM) and non-radiative, and wherein the structure generates an EM near-field in response to receiving the energy; and a negative index material (NIM) arranged within the EM near-field such that the coupling is enhanced. | 06-09-2011 |
20110133568 | Wireless Energy Transfer with Metamaterials - Embodiments of the invention disclose a system configured to exchange energy wirelessly. The system includes a structure configured to exchange the energy wirelessly via a coupling of evanescent waves, wherein the structure is electromagnetic (EM) and non-radiative, and wherein the structure generates an EM near-field in response to receiving the energy; and a metamaterial arranged within the EM near-field such that the coupling is enhanced. | 06-09-2011 |
20110156486 | Wireless Energy Transfer with Negative Index Material - Embodiments of the invention disclose a method and a system configured to exchange energy wirelessly, comprising a structure configured to exchange the energy wirelessly via a coupling of evanescent waves, wherein the structure is electromagnetic (EM) and non-radiative, and wherein the structure generates an EM near-field in response to receiving the energy; and a controller configured to tune up the structure such that the near-field is generated according a particular energy distribution pattern. | 06-30-2011 |
20110156487 | Wireless Energy Transfer with Energy Relays - Embodiments of the invention disclose a method and a system configured to transfer energy wirelessly, comprising a source configured to transfer the energy wirelessly to a sink via a coupling of evanescent waves, wherein the source generates an electromagnetic (EM) near-field in response to receiving the energy; and an energy relay arranged such that to increase the coupling between the source and the sink, wherein the source, the sink, and the energy relay are electromagnetic and non-radiative structures. | 06-30-2011 |
20110169335 | System and Method for Energy Transfer - A system configured to exchange energy wirelessly is disclosed. The system comprises a structure configured to exchange the energy wirelessly via a coupling of evanescent waves, wherein the structure is electromagnetic (EM) and non-radiative, and wherein the structure is a resonant having a resonant mode, wherein the structure is configured to exchange the energy when the structure is in the resonant mode, and to store the energy when the structure is not in the resonant mode; a tuning module configured to transition the structure in and out of the resonant mode based on an instruction; an energy monitor module configured to determine the instruction based on information indicative of the energy stored and/or exchanged by the structure; and a transceiver configured to transmit and/or to receive the instruction. | 07-14-2011 |
20110169336 | Wireless Energy Transfer to Moving Devices - Embodiments of the invention disclose a method and a system configured to transfer energy wirelessly, comprising: a source configured to generate evanescent waves, in response to receiving the energy, on at least part of a surface of the source; a sink configured to receive the energy wirelessly from the source via a coupling of the at least part of the evanescent waves; and a load configured to receive the energy from the sink, wherein the load and the sink are configured to move along the surface of the source such that the at least a part of the evanescent waves are coupled between the source and the sink within an energy transfer area. | 07-14-2011 |
20110176416 | Method for Discovering Multiple Routes in Sensor Networks - Multiple routes from a data source node to multiple data destination nodes in a large scale multi-hop mesh network are discovered. Nodes discover multiple routes to two destinations in an initial discovery phase that includes only two network-wide flooding of packets. The method can also work with one destination. The method can be extended to include more destinations with a proportional increase in the communication overhead. After the completion of the discovery phase, nodes can communicate or forward their own or received data by using any of the available routes. | 07-21-2011 |
20110310931 | Antenna Selection with Frequency-Hopped Sounding Reference Signals - The embodiments of the invention provide a method for selecting antennas for date transmission in a wireless communication network including user equipment (UE). The network is assigned a band of frequencies, wherein the band is partitioned into at least one set of subbands of the band according to a sounding reference signal (SRS) band-width configuration in a form of a code-tree having a plurality levels and each level is associated with a partition coefficient. The UE is configured to transmit frequency-hopped SRS on the set of sub-bands using subsets of the set of antennas. First, the method determines if a number of subbands in the set of the sub-bands is odd or even based on the SRS bandwidth configuration, and selects a particular subset of the antennas according to whether the number is odd or even. Then, the SRS is transmitted from the particular subset of the antennas. | 12-22-2011 |
20120038219 | Wireless Energy Transfer with Anisotropic Metamaterials - Embodiments of the invention disclose a system configured to exchange energy wirelessly. The system includes a structure configured to exchange the energy wirelessly via a coupling of evanescent waves, wherein the structure is electromagnetic (EM) and non-radiative, and wherein the structure generates an EM near-field in response to receiving the energy; and an anisotropic metamaterial arranged within the EM near-field such that the coupling is enhanced. | 02-16-2012 |
20120041804 | System and Method for Ad-Hoc Energy Exchange Network - A method for facilitating an operation of an ad-hoc energy exchange network is disclosed. The network includes a set of nomadic charging stations (NCSs) and an energy consumer (EC). Upon receiving a request from the EC for an energy exchange, wherein the request includes a current location and a destination location of the EC, an exchange location for performing the energy exchange between a nomadic charging station (NCS) and the EC is determined based on the current location of the EC, the destination location of the EC, and a current location of the NCS. The exchange location is transmitted to the NCS and the EC. | 02-16-2012 |
20120080956 | Wireless Energy Transfer Using Array of Resonant Objects - A system for exchanging energy wirelessly comprises an array of at least three objects having a resonant frequency, each object is electromagnetic (EM) and non-radiative, and generates an EM near-field in response to receiving the energy, wherein each object in the array is arranged at a distance from all other objects in the array, such that upon receiving the energy the object is strongly coupled to at least one other object in the array via a resonant coupling of evanescent waves; and an energy driver for providing the energy at the resonant frequency to at least one object in the array, such that, during an operation of the system, the energy is distributed from the object to all other objects in the array. | 04-05-2012 |
20120150468 | Method and System for Estimating and Tracking Frequency and Phase Angle of 3-Phase Power Grid Voltage Signals - A method estimates parameters of 3-phase voltage signals to synchronize a power grid in a presence of a voltage unbalance by transforming the 3-phase voltage signals to αβ-reference signals using a Clark transformation matrix, and estimating sinusoidal signals and corresponding quadrature signals of the αβ-reference signals using an extended Kalman filter, and determining a phase angle of a positive sequence based on a relationship of the phase angle to the estimated the sinusoidal signals. | 06-14-2012 |
20120178502 | Method for Selecting Antennas in a Wireless Networks - A method transmits data from a user equipment (UE) including a transceiver having a set of available antennas. The method selects a subset of antennas from the set of available antennas; and transmits the data by the transceiver using the subset of antennas. The selecting subset of antennas includes transmitting sounding reference signals (SRSs) according to specified times, frequencies, and antennas; and receiving, in response to the transmitting the SRSs, information indicative of a selection of the subset of antennas. | 07-12-2012 |
20120217816 | Wireless Energy Transfer Using Arrays of Resonant Objects - A system for exchanging energy wirelessly includes an array of at least three objects, wherein the objects have similar resonant frequencies, wherein each object is electromagnetic (EM) and non-radiative and generates an EM near-field in response to receiving the energy. Each object is electrically isolated from the other objects and arranged at a distance from all other objects, such that upon receiving the energy, the object is strongly coupled to at least one other object via a resonant coupling of evanescent waves. An energy driver provides the energy at the resonant frequency to at least one object in the array, such that, during an operation of the system, the energy is distributed from the at least one object to all other objects in the array via the resonant coupling of the evanescent waves. | 08-30-2012 |
20120217817 | Tuning Electromagnetic Fields Characteristics for Wireless Energy Transfer Using Arrays of Resonant Objects - A system for exchanging energy wirelessly includes an array of objects, wherein each object is electromagnetic (EM) and non-radiative and generates an EM near-field in response to receiving the energy. Each object in the array is electrically isolated from the other objects and arranged at a distance from all other objects. An energy driver provides the energy to the array of objects. A receiver, at a relative position with respect to the array receives the energy via resonant coupling of evanescent waves. The system can tunes characteristics of the EM near-field depending on a relative position of the receiver with respect to the array. The tuning can affect frequency, phase and amplitude of the energy field. | 08-30-2012 |
20120253742 | Method and System for Determining Parameters of Sinusoidal Signals - At least one parameter of a signal is determined, wherein the signal is a sinusoidal signal including noise, wherein the parameter includes at least one of a frequency of the signal, and an angle of a phase of the signal. The frequency of the signal is determined iteratively based on a linear relationship among the frequency of the signal, samples of the noise, and samples of the signal using a statistical correlation among the samples of the noise. During a current iteration the statistical correlation is updated based on the frequency of the signal determined during a previous iteration, and the samples of the signal are updated with values of the signal during a current period of time. | 10-04-2012 |
20130127252 | Wireless Energy Transfer with Perfect Magnetic Conductors - A system that transfers energy wirelessly includes a transmitter of the energy and a receiver of the energy. A housing made of a material that approximates properties of a perfect magnetic conductor. The housing is arranged to direct a magnetic field from the transmitter to the receiver to improve an efficiency of the energy transfer from the transmitter to the receiver. | 05-23-2013 |
20130140908 | Wireless Energy Transfer with Metamaterials - Embodiments of the invention disclose a system configured to exchange energy wirelessly. The system includes a structure configured to exchange the energy wirelessly via a coupling of evanescent waves, wherein the structure is electromagnetic (EM) and non-radiative, and wherein the structure generates an EM near-field in response to receiving the energy; and a metamaterial arranged within the EM near-field such that the coupling is enhanced. | 06-06-2013 |
20130141156 | High Electron Mobility Transistors with Multiple Channels - A device includes a source for transmitting an electronic charge through a conduction path; a drain for receiving the electronic charge; a stack for providing at least part of the conduction path; and a gate operatively connected to the stack for controlling a conduction of the electronic charge. The stack includes an insulator layer, an N-polar layer and a barrier layer selected such that, during an operation of the device, the conduction path formed in the N-polar layer includes a two-dimensional electron gas (2DEG) channel and an inversion carrier channel. | 06-06-2013 |
20130144588 | System and Method for Analyzing Spiral Resonators - A spiral resonator is analyzed by modeling a set of loops of the spiral resonator with a model of a circuit including a set of units, wherein each unit includes a resistor and an inductor to model one loop of the spiral resonator. Values of the resistor and the inductor of each unit are based on properties of a corresponding loop. Electrical connection of the loops is modeled by electrically connecting the units in a corresponding order of the loops. A capacitive coupling in the spiral resonator is modeled by connecting adjacent units with at least one capacitor having a value based on the capacitive coupling between two corresponding adjacent loops. An inductive coupling in the spiral resonator is modeled based on inductive coupling between pairs of loops. The operation of the spiral resonator is simulated with the model of the circuit. | 06-06-2013 |
20130158901 | Method and System for Detecting Unbalance in Power Grids - A method for detecting unbalance in a 3-phase voltage signal includes sampling the signal over an observation widow to determine a set of observations, and detecting the unbalance of the signal based on a probability density function (pdf) of the set of observations. | 06-20-2013 |
20130178168 | Multi-Band Matching Network for RF Power Amplifiers - A multi-band matching network for RF power amplifiers utilizes multiple impedance transformer branches connected in parallel. Each transformer branch achieves matching at one frequency band. A core of each transformer branch is connected between frequency blocking networks, which reject out-of-band signals. | 07-11-2013 |
20130241467 | Method and System for Charging Batteries Using a Kinetic Model - A battery is charged by first charging the battery at a constant current during a first time interval, and then charging the battery at a varying current during a second time interval. The battery can be a lithium-ion battery, and the charging uses a kinetic model. The kinetic model models the battery having an indiffused well having a capacity c, and a difused well having a capacity 1−c, and the indiffused well is filled directly by the current, and the diffused well is filled only from the indiffused well via a valve with constant inductance. | 09-19-2013 |
20140016382 | Space Vector Modulation for Multilevel Inverters - Inverter is modulated based on first, second, and third switching states determined according to a reference vector represented as a sum of a remainder vector connecting the reference vector with a first vertex of a modulation triangle and a set of vertex vectors connecting a center vertex of space vector diagram with the first vertex. A first switching state of the inverter at the first vertex is determined based on angles of vertex vectors in the set. A second switching state of the inverter at a second vertex of the modulation triangle and a third switching state of the inverter at a third vertex of the modulation triangle are determined based on the first switching state and the remainder vector. | 01-16-2014 |
20140098837 | Antenna Selection with Frequency-Hopped Sounding Reference Signals - A transceiver has a first antenna and a second antenna for transmitting alternatively a frequency-hopped sounding reference signal (SRS) over a sub-band of a bandwidth at a time. The transceiver includes a determination unit for determining whether a number of sub-bands in the bandwidth is odd or even, a transmitter for transmitting the SRS continuously from the first antenna, if the number of sub-bands is even, and a receiver for receiving a response to the transmitting. | 04-10-2014 |
20140197691 | Wireless Energy Transfer for Misaligned Resonators - A system for transferring energy wirelessly includes a source for generating a circular polarized field in response to receiving the energy and a sink strongly coupled to the source for receiving the energy wirelessly via a resonant coupling of the field. | 07-17-2014 |
20140266324 | High Electron Mobility Transistor with Multiple Channels - A device includes a source and a drain for transmitting and receiving an electronic charge. The device also includes a first stack and a second stack for providing at least part of a conduction path between the source and the drain, wherein the first stack includes a first gallium nitride (GaN) layer of a first polarity, and the second stack includes a second gallium nitride (GaN) layer of the second polarity, and wherein the first polarity is different from the second polarity. At least one gate operatively connected to at least the first stack for controlling a conduction of the electronic charge, such that, during an operation of the device, the conduction path includes a first two-dimensional electron gas (2DEG) channel formed in the first GaN layer and a second 2DEG channel formed in the second GaN layer. | 09-18-2014 |
20140285264 | Reconfigurable Output Matching Network for Multiple Power Mode Power Amplifiers - An impedance matching network for a radio frequency (RF) amplifier includes multiple stages connected to each other in a first to last order. A first stage produces an RE output signal, and a last stage receives an RF input signal. Each stage includes a first inductor connected to produce an output signal, a second inductor connected to receive an input signal from a next stage, a capacitor connected between the first and second inductors and a ground. In addition, each stage other than the first stage further includes a first switch to by-pass the first and second inductors, a second switch connected between the first and second inductors and the ground, and a controller for controlling, the first and second switches to select a particular power level of a set of power levels. | 09-25-2014 |
20150016489 | Antenna Selection with Frequency-Hopped Sounding Reference Signals - The embodiments of the invention provide a method for selecting antennas for data transmission in a wireless communication network including user equipment (UE). The network is assigned a band of frequencies, wherein the band is partitioned into at least one set of subbands of the band according to a sounding reference signal (SRS) bandwidth configuration in a form of a code-tree having a plurality levels and each level is associated with a partition coefficient. The UE is configured to transmit frequency-hopped SRS on the set of subbands using subsets of the set of antennas. First, the method determines if a number of subbands in the set of the subbands is odd or even based on the SRS bandwidth configuration, and selects a particular subset of the antennas according to whether the number is odd or even. Then, the SRS is transmitted from the particular subset of the antennas. | 01-15-2015 |
20150069840 | Maximum Power Point Tracking for Photovoltaic Power Generation System - A method controls power generated by a photovoltaic array. The method estimates a voltage corresponding to a global maximum power point (MPP) of the power generated by the photovoltaic array to produce an estimated voltage; and tracks an output of the power based on the estimated voltage to determine the global MPP. | 03-12-2015 |