313results about How to "Reduce "feedback" patented technology

A canal hearing device with a dual acoustic seal system for preventing feedback while minimizing occlusion effects. The two-part device comprises a main module and an elongated tubular insert for conducting sound to the tympanic membrane and sealing within the bony region of the ear canal. The main module is positioned in the cartilaginous portion of the ear canal. The tubular insert comprises a sound conduction tube and a cylindrically hollow primary seal medially positioned in the bony region. The device also comprises a secondary seal laterally positioned in the cartilaginous region. The secondary seal, although providing additional acoustic sealing for the prevention of feedback, is sufficiently vented to provide a path of least acoustic resistance for occlusion sounds within the ear canal. In a preferred embodiment, the tubular insert comprises a coiled skeletal frame to provide high radial flexibility while maintaining sufficient axial rigidity for comfortable, kink-resistant, and consistent placement within the ear canal.

Techniques are provided for reducing feedback while maintaining performance in a MIMO-OFDM system. The disclosed techniques employ finite-rate feedback methods that uses vector quantization compression. The disclosed methods / techniques generally involve: receiving a plurality of symbols from a plurality of sub-carriers at a receiver; selecting a plurality of indices of codewords corresponding to a codebook of pre-coding weighting matrices for the sub-carriers based on vector quantization compression of the codewords; and transmitting the selected indices over a wireless channel to a transmitter. Finite state vector quantization feedback makes use of a finite state vector quantizer (FSVQ), which is a recursive vector quantizer (VQ) with a finite number of states. In finite state vector quantization feedback, optimal precoding matrices (beamforming vectors) are selected sequentially across subcarriers. In a trellis-based feedback method, the optimal precoding matrices are selected at the same time for all subcarriers by searching for the optimum choice of matrices along a trellis using the Viterbi algorithm (dynamic programming).

An apparatus and method for assigning sub-carriers in an orthogonal frequency division multiplex (OFDM) system are disclosed. In the apparatus and method, data is transmitted through at least one transmit antenna. At least two sub-carriers in a predetermined frequency band are assigned to a user equipment (UE), for data transmission. A Node B groups sub-carriers available to the OFDM system into sub-carrier groups, each having at least two sub-carriers, transmits data to the UE on sub-carriers in the sub-carrier groups, selects at least one sub-carrier group for the UE based on channel condition information about each of the sub-carrier groups received from the UE, and assigns the selected sub-carrier group to the UE.

Apparatuses and methods for managing route navigation via mobile devices. A route is calculated between a starting point and a destination point. The route is divided into multiple segments based on the complexity of the calculated route, and navigation features are controlled as a function of the segment that corresponds to the user's current location. The user may opt to identify one or more segments, or one or more route portions independent of whether or not segmentation has occurred, in order to specify a portion(s) of the route where navigation support is not needed.

A repeater for re-transmitting uplink and downlink signals in a wireless network. The repeater uses antenna cross-polarization, signal cancellation and digital processing techniques to reduce or eliminate coupling of echo signals between the receive and transmit antennas of the downlink and uplink signal paths in the repeater.

A space-time-frequency domain based information feedback method, system, user equipment and base station for wireless transmission technical fields is provided. The user equipment measures and evaluates quality of wireless transmission downlinks in MIMO system, obtains rank, precoding matrix index and channel quality indicator information in the wireless transmission downlinks, processes information of the wireless transmission downlink respectively in space domain, frequency domain and time domain by using space selectivity, frequency selectivity and time selectivity characteristics of a channel, and feeds back downlink information to the base station through uplinks by using feedback schemes. The base station optimizes a transmitter according to feedback information from the user equipment.

An apparatus and method for selecting an effective channel in a multi-user MIMO system are provided, in which a receiver receives pilot signals from a transmitter, determines channel information indicating an antenna offering the best quality among a plurality of antennas using the pilot signals, and generates feedback information with the channel information, and the transmitter receives feedback information from a plurality of receivers, generates a channel matrix using the feedback information, and transmits data simultaneously to the plurality of receivers using the channel matrix.

An apparatus and method for transmitting and / or receiving data in a closed-loop multi-antenna system, the method of receiving data including: acquiring CQIs of data streams by channel estimation of a received signal; selecting at least one CQI from among the acquired CQIs; calculating a common CQI using the acquired CQIs; generating feedback information with the at least one CQI, the common CQI, and an index of a data stream with the at least one CQI; and transmitting the feedback information to a transmitter.

A method for feeding back channel state information (CSI) in a wireless communication system, carried out by a terminal, according to the present specification comprises the steps of: transmitting, to a base station, capability information of the terminal for CSI-related action; receiving configuration information for the CSI-related action from the base station; tracking partially activated CSI reference signal (RS); measuring fully activated CSI-RS; and reporting the results of the measurement to the base station.

A digital communications transmitter (100) includes a digital linear-and-nonlinear predistortion section (200) to compensate for linear and nonlinear distortion introduced by transmitter-analog components (120). A direct-digital-downconversion section (300) generates a complex digital return-data stream (254) from the analog components (120) without introducing quadrature imbalance. A relatively low resolution exhibited by the return-data stream (254) is effectively increased through arithmetic processing. Linear distortion is first compensated using adaptive techniques with an equalizer (246) positioned in the forward-data stream (112). Nonlinear distortion is then compensated using adaptive techniques with a plurality of equalizers (226) that filter a plurality of orthogonal, higher-ordered-basis functions (214) generated from the forward-data stream (112). The filtered-basis functions are combined together and subtracted from the forward-data stream (112).

This invention discloses a new switching device supported on a semiconductor that includes a drain disposed on a first surface and a source region disposed near a second surface of said semiconductor opposite the first surface. The switching device further includes an insulated gate electrode disposed on top of the second surface for controlling a source to drain current. The switching device further includes a source electrode interposed into the insulated gate electrode for substantially preventing a coupling of an electrical field between the gate electrode and an epitaxial region underneath the insulated gate electrode. The source electrode further covers and extends over the insulated gate for covering an area on the second surface of the semiconductor to contact the source region. The semiconductor substrate further includes an epitaxial layer disposed above and having a different dopant concentration than the drain region. The insulated gate electrode further includes an insulation layer for insulating the gate electrode from the source electrode wherein the insulation layer having a thickness depending on a Vgsmax rating of the vertical power device.

A system and method for transparent coordinated beam-forming are provided. A method for transmitting information includes determining correlations between communications devices served by a communications controller and communications devices served by neighboring communications controllers, selecting a communications device from the communications devices served by the communications controller, adjusting a manner of transmission of a transmission containing information to the selected communications device based on a correlation for the selected communications device, and transmitting the transmission to the selected communications device.

A multicarrier communication apparatus capable of reducing an amount of information required for feedback, making a range of transmission power fluctuation small, and achieving rapid convergence on a target transmission power is disclosed. With this apparatus, subcarrier pair determination section (1142) puts a plurality of subcarriers contained in a multicarrier signal into pairs, notifies combining section (106) of information pertaining to the pairs of subcarriers, combines received power of each pair of subcarriers, and outputs combined received power obtained in this manner to command producing section (1146). Target power storage section (1144) stores target power for received power in such a manner that SIR at the subject apparatus becomes a desired SIR. Command producing section (1146) compares combined received power for the pairs of subcarriers and target received power, produces a command indicating a difference in power between these two received powers, and generates a control signal containing the produced command.

An earpiece auditory device is described which includes a behind-the-ear component shaped to fit behind the ear of a user. The behind-the-ear component can also have at least one microphone and processing circuitry, where the processing circuitry is used to processes audio signal from the microphone. The device also includes a speaker sized to fit in the ear canal of a user, and an ear mold holding the speaker in place. The ear mold can also be position to touch the bony portion of the ear canal and provide sound attenuation in the ear canal. A connector physically and electrically connects the behind-the-ear component to the speaker. The connector is capable of being used to insert and remove the speaker and ear mold from the ear canal of the user.

Multi-mode diode emitters are stacked in a staircase formation to provide a spatially-mulitplexed output. Improved coupling efficiency is achieved by providing tilted collimated output beams that determine an effective step height of the stepped structure. Since the effective step height is dependent on the tilt angle, a variable number of emitters can be used inside packages having a same physical step height, while still attaining high coupling efficiency.

The present invention relates to a senseless MPPT control apparatus of a photovoltaic power generation system and a method thereof. The control apparatus includes a current transformer, an A / D converter, a new and old current detector, a new duty ratio detector, an old duty ratio detector, a new and old duty ratio comparator, first and second new and old current comparators, a duty ratio adder, a duty ratio subtractor and a PWM signal generator. A maximum output point of a solar battery cell is tracked by using only one feedback current flowing into a load. Further, feedback factors can be reduced to one. It is possible to simplify the construction of a control circuit and minimize tracking control failure.

A bowstring release includes a handle, a bowstring catch, and a link between the handle and catch. The catch includes a hook for retaining the bowstring, and a cam for holding and releasing the hook. The handle is initially rotatably mounted with respect to the link, so as the bowstring is drawn, the cam will retain the hook to hold the bowstring regardless of handle position. The handle has a spring-biased piston, and the link has one hole that can receive the piston. At full draw, the archer may rotate the handle so the piston will enter the hole in the link, locking the handle and link together. Further rotation of the handle will cause the link and attached cam to rotate out of engagement with the hook, to release the bowstring.

Methods and apparatus are disclosed for applying successive multi-rank beamforming strategies (e.g., successive preceding strategies) for the design of precoders over a set of parallel channels. Successive beamforming is applied to a narrow band channel model and is also applied for finer quantization of a single beamforming vector (e.g., recursive beamforming). A first embodiment provides the optimal approach with high complexity. An alternative embodiment provides successive beamforming for near optimal preceding selection with medium complexity. A low complexity method for precoder selection is also provided wherein a channel representative matrix for the set of parallel channels is determined and successive beamforming on the calculated channel representative is applied.

Embodiments include an earbud headphone adapter configured to securely retain an earbud headphone in a user's ear, preserve the quality of sound emitted from the earbud headphone into a user's ear, and / or reduce the discomfort commonly experienced by users from prolonged wearing of an earbud headphone. A hollow body having a cavity extending from a first plane to an earbud opening about an axis substantially perpendicular to a second plane is configured to stretch over and securely retain an earbud headphone. A portion of the hollow body may taper from the earbud opening to a sound opening. A stabilizer extends from the hollow body generally along the first plane and is configured to engage with the concha area of a user's ear while the sound opening is within the ear canal opening to securely retain the earbud adapter and earbud headphone in the user's ear.

A medical device includes an elongate metallic hypotube having an open proximal end and an opposed open distal end defining a tubular wall having an open internal diameter and an exterior diameter. The tubular wall has a first flexible portion disposed near the proximal open end and a second portion disposed near the distal open end. The first flexible portion of the hypotube includes a plurality of slots extending through the tubular wall and having a circumferential arc from about 150° to about 300°; and where adjacent slots are axially offset from one and the other from about 30° to about 60°. The medical device may be used as part of an endovascular delivery system.

An inverter has a semiconductor switch circuit in the primary winding of a transformer such that each of the switches of the switch circuit is controlled by pulse-width modulation (PWM) to supply a constant ac current and a constant ac voltage to a load, such as a cold cathode fluorescent light, connected to a secondary winding of the transformer. A common slow-start control circuit is provided in the inverter circuit to enable a common slow startup of the PWM control of the output voltage and output current. This arrangement suppresses an excessive voltage and an inrushing current during a startup.

A magnetic balance type current sensor includes a magnetoresistance effect element whose resistance value changes owing to the application of an induction magnetic field from a current to be measured; a feedback coil disposed in the vicinity of the magnetoresistance effect element and generating a cancelling magnetic field cancelling out the induction magnetic field; a magnetic field detection bridge circuit including two outputs causing a voltage difference corresponding to the induction magnetic field to occur; and a magnetic shield attenuating the induction magnetic field and enhancing the cancelling magnetic field, wherein, on the basis of the current flowing through the feedback coil at the time of an equilibrium state in which the induction magnetic field and the cancelling magnetic field are cancelled out, the current to be measured is measured, wherein the feedback coil, the magnetic shield, and the magnetic field detection bridge circuit are formed on a same substrate.

The invention relates to a single photon counting and imaging detection device. A high-voltage power supply of the device is connected with a micro-imaging reinforced tube through a high tension lead; a display, an image processing device and a printer are connected with a computer respectively; an anode collector is arranged between the micro-imaging reinforced tube and a preamplifier; the anode collector comprises a substrate, an electrode plated on the substrate and a signal lead; an anode is connected with the preamplifier through the signal lead; and the micro-imaging reinforced tube comprises a photocathode and a microchannel plate connected with the photocathode which are arranged sequentially along a light path. The device has the characteristics that the device can read out a time mark for arriving time and a general image of integral in a period, realize the single photon counting and two-dimensional imaging detection of an extremely-weak object, has the function of single photon counting, and can perform two-dimensional imaging on the extremely-weak luminous object. The device has the advantages of large area array, high sensitivity, low dark count, high resolution factor, good imaging linearity and the real-time measurement and processing.

A method for reporting channel state information includes: obtaining channel state information of a described object; and feeding back the obtained channel state information to a base station in a comb manner. A method for channel estimation includes: receiving channel state information that is reported by a terminal in a comb manner; and determining, according to the channel state information that is reported in the comb manner, channel state information corresponding to a described object that does not report channel state information.

To prevent a malfunction of an overcurrent protection circuit without increasing an on-voltage, and to suppress a short circuit capacity, thus further reducing a switching loss, a trench gate IGBT is provided in which is incorporated a sense IGBT connected in parallel to a main IGBT, where only the sense IGBT portion includes a p-type channel region all over in a semiconductor substrate between adjacent parallel striped trenches, so that the capacitance of the MOS gate of the sense IGBT is smaller than the capacitance of the MOS gate of the main IGBT.