摘要:
Provided are a cell search method, a forward link frame transmission method, an apparatus using the methods, and a forward link frame structure in an Orthogonal Frequency Division Multiplexing cellular system, wherein the time it takes to perform a cell search and the complexity of the cell search can be reduced. The cell search apparatus includes a sync acquirer which receives a signal according to a forward link frame comprising a plurality of sync channel symbols each having different intervals between the adjacent sync channel symbols and achieves synchronization of the sync channel symbols using a sync channel of the received signal, and a boundary detector which detects a frame boundary using an interval pattern between the sync channel symbols, based on the achieved synchronization.
摘要:
The present invention relates to a transmit diversity method of a mobile communication system and a base station transmitting apparatus using the same. A first code and a second code that is diversity-encoded from the first code are generated, and transmit symbols are spread with the first code and the second code. A first transmit symbol spread with the first code and a second transmit symbol spread with the second code are mapped to symbols in frequency and time domains in a frame and transmitted through antennas. Therefore, various diversity techniques can be provided to the mobile communication system, and the diversity technique is not restricted to symbols transmitted to the same mobile station and can also be applied to a 1-bit channel.
摘要:
A hard disk drive with a circuit that provides a control signal to a voice coil motor to move a head across a disk. The circuit includes a repeatable run-out estimator in a feed forward control loop to control the movement of the head. The repeatable run-out estimator compensates for a constant bias torque disturbance in the drive.
摘要:
A fuel pump for a vehicle comprises: a driving motor; an impeller having a substantially circular shape, the impeller being rotatable by operation of the driving motor; and a pump casing covered with a casing cover, the pump casing and casing cover together defining a central cavity for receiving the impeller rotatable therein, the pump casing and casing cover including a fuel inlet port and a fuel outlet port, the pump casing and casing cover each further including a circular groove formed along the surface thereof in respective fluid communication with the central cavity of the pump casing and casing cover. The impeller includes a plurality blades of generally V-shape cross-section disposed along an outer surface of the impeller with a plurality of blade grooves defined between the blades, the blade grooves in fluid communication with respective circular groove of the pump casing and casing cover, wherein each of the blades includes a fuel inlet blade portion disposed at an inner area of the blade grooves and a fuel outlet blade portion disposed at an outer area of the blade grooves, with a boundary portion disposed between the fuel inlet blade portion and the fuel outlet blade portion, in which a front surface angle and a rear surface angle of each of the fuel inlet blade portion and the fuel outlet blade portion respectively varies relative to the length of each of the blades.
摘要:
Disclosed is a method of providing a mobile phone broadcasting service using a cell broadcasting system (CBS) including (1) processing information in forms of voice, multimedia, text and image by an information providing system and transmitting the processed information to a mobile phone broadcasting system through an Internet network, (2) simultaneously transmitting the text and image information out of the information received from the mobile phone broadcasting system, a linked phone number connectable to an automatic response system (ARS) or a linked URI, connectable to a wireless Internet broadcasting server to a plurality of mobile phone terminals through a wireless network, and (3) when the linked phone number is selected in order to receive voice information out of the information individually received from the mobile phone terminals, the ARS providing the voice information to a mobile phone terminal for the selected phone number, or when the linked URI, is selected in order to receive multimedia information out of the information individually received from the mobile phone terminals, the wireless Internet broadcasting server providing the multimedia information to a mobile phone terminal for the selected URI.
摘要:
An apparatus and method for detecting a space-time multi-user signal are disclosed. The apparatus includes: an RF/IF processing unit for converting received signals through an array antenna into digital baseband signals; a splitting unit for dividing the digital baseband signals into data signals and reference signals; a estimating unit for estimating a delay time information and a channel impulse response; a vector generating unit for receiving the reference signals and the delay time information of to thereby generate a beamforming weight vector; a matrix generating unit for receiving the channel impulse response and the beamforming weight vector to there by generate a system matrix; a filtering unit for receiving the data signals and the system matrix to multiply the system matrix to data per each antenna; a antenna combining unit for combining signals outputted from the filtering unit; and an interference cancelling unit for cancelling an interference signal.
摘要:
Method of estimating the stroke sensitivity of micro-actuator coupled with slider and its read-write head. Micro-actuator stimulus signal used to drive micro-actuator, inducing noise into lateral positioning of read-write head near track by voice coil motor to create PES. Lateral position noise derived from Position Error Signal. Stroke sensitivity estimated from lateral position noise and micro-actuator stimulus signal. Apparatus supporting method estimating stroke sensitivity: servo controller, embedded circuit including servo-controller, and hard disk drive may include servo-controller and/or embedded circuit. Method making servo-controller, embedded circuit, and/or hard disk drive. Servo-controller, embedded circuit, and hard disk drive are products of these processes.
摘要:
Disclosed is a wheel locking device for vehicles which prevents an unauthorized movement of the vehicle. The wheel locking device for vehicles comprises a supporting disk 10 attached to an outer side surface a wheel 3 and provided with arms 15, fixtures 20 inserted into the arms so as to surround a circumferential surface of the wheel 3, clamping pins 30 for fixing the fixtures 20, a guard disk 35 for surrounding an outer side surface of the supporting disk 10 so as to cover the clamping pins 30, a clamping bolt 40 for holding the guard disk 35 and the supporting disk 10 together, a lock 45 for locking the clamping bolt 40. The wheel locking device is easily assembled and attached to the wheel, and is effectively protected from an unauthorized separation from the wheel. Further, the locations of the fixtures are adjusted according to the size of the wheel of the vehicle or the fixture has a folding-type structure easily fixed to the wheel without interfering with the frame of the vehicle, thereby being firmly secured to the wheel.
摘要:
The invention applies to servo controllers for at least the voice coil motor of a hard disk drive. Today, many control algorithms require 80 to 90 percent of the sampling period to complete their calculation of the next control, making computation time delay no longer negligible. The invention accommodates the transport delay, such as computation time delay, into the state estimator and into the whole control system. Experimental results using a commercial hard drive, as well as simulation results, show that the invention's method effectively improves the hard disk drive control system stability by increasing the phase margin and gain margin. The invention includes the method of operating the servo-controller, as well as the apparatus implementing that method. The invention also includes hard disk drives containing servo-controllers implementing the method, and program systems residing in accessibly coupled memory to a computer within the servo controller implementing the method.
摘要:
Improved head gimbal assemblies reducing TMR (Track Mis-Registration) in a hard disk drive are provided. These head gimbal assemblies are as mechanically simple as contemporary head gimbal assemblies, support parallel flying sliders over flat disk surfaces, and reduce TMR' induced by disk vibration. They are easier to build, more reliable, and cost less to make, than other known approaches at comparable track densities and rotational rates. The improved head gimbal assemblies include three sets of mechanisms moving the slider parallel the disk surface, when the disk surface is flat, and radially moving the slider toward the track, when the disk surface is bent. The first and third mechanisms as well as the second and third mechanisms can be used together in a head gimbal assembly.An improved and distinctive servo-controller scheme resulting in an overall improvement in PES performance, particularly when applied to hard disk drives employing the invention's TMR reduction mechanisms. The servo-controllers trade off gain in the disk vibration frequency range, in favor of, increased rejection of low frequency disturbances. This leads to the lowest PES statistics, when applied to hard disk drives with the TMR reduction mechanisms of the invention.