Abstract: Disclosed is a method for reducing power consumption of a user terminal when synchronization between a user terminal and a base station is disrupted in a broadband wireless access communication system.

Abstract: Disclosed are a channel equalizer and digital television receiver using the same. The equalizer comprises a channel estimator, a channel distortion compensator and noise canceller. The channel estimator estimates an impulse response of a transmission channel from a received signal. The channel distortion compensator transforms and processes the received signal and the estimated impulse response. The noise canceller predicts and eliminates amplified noise generated during equalization.

Abstract: Disclosed is a system and a method for exchanging a short messaging service (SMS) message. To do this, when a sender edits SMS message data which is longer than the length regulated in an SMS message transmission standard, the SMS message data is compressed using Huffman coding and transmitted. A base transceiver station (BTS) connected to a recipient's mobile station (MS), which has received the compressed SMS message data, restores the SMS message data by decoding the compressed SMS message data and transmits the restored SMS message data to the recipient's MS. Accordingly, SMS message data longer than the length regulated in the SMS message transmission standard can be exchanged, and in exchanging of the compressed SMS message data, a processing time of the compressed SMS message data can be reduced, and power consumption of a recipient's MS due to the processing of the compressed SMS message data can be reduced.

Abstract: An apparatus and method for displaying a moving speed of a mobile communication terminal for use with mobile Internet. The method includes sensing the moving speed of the mobile communication terminal, computing the sensed moving speed, and displaying the moving speed. The moving speed is computed using frequency offsets of subcarriers generated in a mobile Internet system. The moving speed can be displayed by a visual indicator, such as color, or numerically.

Abstract: Transmitting and receiving apparatuses for PAPR reduction and an adaptive PAPR control method thereof are provided. Prior to transmission, the transmitting apparatus limits the peak of a multi-carrier modulated signal using a mapping function that increases an output value with an input value and converges the output value to a predetermined value. The receiving apparatus receives the peak-limited signal, recovers the peak of the signal using a demapping function of the mapping function, and recovers data from the peak-recovered signal according to the multi-carrier modulation scheme used. According to the adaptive PAPR control method, a scaling factor can be set variably for the mapping function and the demapping function according to a sub-carrier modulation scheme.

Abstract: Disclosed is a method for obtaining a GPS signal by a user terminal operating in a time division duplex method, the user terminal receiving the GPS signal and a base station signal, the method includes setting a maximum window reception interval for attempting a GPS signal acquisition; setting within a frame an interval for attempting the GPS signal acquisition and attempting the GPS signal acquisition; exponentially increasing the time period for attempting the GPS signal acquisition and reattempting a GPS signal acquisition, when the GPS signal is not obtained in the set interval for the GPS signal acquisition; and ending the GPS signal acquisition attempts when the interval for the GPS signal acquisition is greater than or equal to the maximum window reception interval.

Abstract: Disclosed is an RF transceiver including a receiver chain performing a dual conversion with respect to a received RF signal, thereby generating an IF signal; a chain of transceiver performing a dual conversion with respect to an IF signal to be transmitted, thereby generating an RF signal; and an IF SAW filter used in the receiver chain and the transmitter chain in common, the IF SAW removing an unnecessary signal generated during a first down-conversion after an IF signal having undergone the first down-conversion is IF-amplified in the receiver chain, and removing an unnecessary signal generated during a first up-conversion after an IF signal having undergone the first up-conversion is IF-amplified in the transmitter chain.

Abstract: Disclosed is a method for obtaining a GPS signal by a user terminal operating in a time division duplex method, the user terminal receiving the GPS signal and a base station signal, the method includes setting a maximum window reception interval for attempting a GPS signal acquisition; setting within a frame an interval for attempting the GPS signal acquisition and attempting the GPS signal acquisition; exponentially increasing the time period for attempting the GPS signal acquisition and reattempting a GPS signal acquisition, when the GPS signal is not obtained in the set interval for the GPS signal acquisition; and ending the GPS signal acquisition attempts when the interval for the GPS signal acquisition is greater than or equal to the maximum window reception interval.

Abstract: Disclosed is a method for reducing power consumption of a user terminal when synchronization between a user terminal and a base station is disrupted in a broadband wireless access communication system.

Abstract: A soft method for variably changing a modulation method in a broadband wireless access communication system. By softly applying and changing the modulation method according to a receiving error rate of a received signal in a relevant modulation method and a difference between error rates of adjacent received signals, and according to whether a power level of a received signal increases or decreases, it is possible to maintain a stable communication state and to reduce a reset time accompanied by changing the modulation method.

Abstract: Disclosed is a method for establishing a sleep mode in a broadband wireless access communication system. The method for establishing the sleep mode includes a first step of placing a subscriber station into the awake mode after time having a maximum window value lapses, determining whether or not a message representing that there exists data to be transmitted from a base station, placing the subscriber station into the sleep mode when the received message represents that there does not exists data to be transmitted from a base station, and establishing a window value for a present sleep mode based on than a preset window value of a previous sleep mode loop within the maximum window value.

Abstract: An apparatus for verifying diversity of a base station in a mobile communication system in which the base station outputs at least one antenna signal using a space-time transmit diversity. Attenuators attenuate and output each antenna signal according to reception sensitivity of a terminal. A coupler couples the signals output from the attenuators with each other and outputs a coupled signal. The terminal receives the coupled signal and demodulates the received signal. A computer is connected to the terminal, and monitors an operation state of the terminal while receiving the signal from the base station, and performs an error check for determining if an error exists in the signal received in the terminal.

Abstract: A communication apparatus and method are disclosed using Bluetooth wireless communication to control a Bluetooth terminal having a Bluetooth module to perform wired communication. The apparatus includes a Bluetooth wireless terminal having a Bluetooth module, a wired phone, and a wired network. The method uses Bluetooth wireless communication to control the Bluetooth wireless terminal to receive a wired communication service by: allowing a user to register a Bluetooth ID of the Bluetooth wireless terminal in the wired phone; upon receiving a wired communication request signal from the Bluetooth wireless terminal, determining with the wired phone whether the Bluetooth wireless terminal is previously registered; and connecting the Bluetooth wireless terminal with the wired network if the Bluetooth wireless terminal is previously registered.

Abstract: A subway broadcast method and apparatus.

Abstract: Disclosed is a channel estimator adopting masking. In a channel estimator using a CIR (channel impulse response) estimating value, the present invention includes a CIR masking unit removing a noise included in the CIR estimating value. Accordingly, the present invention is capable of filtering noises resulting from finiteness of the PN sequence used in finding the cross correlator, thereby enabling to enhance accuracy for the CIR estimating value. And, the enhanced accuracy for the CIR estimating value enables to improve tracking performance to the time variable channel of the frequency domain equalizer using the channel estimator.

Abstract: An unmanned lodging house device, which combines a payment system based on a mobile communication terminal with an electronic door lock unit, and a method for providing check in/out services using the unmanned lodging house device, and a computer-readable recording medium stored with a program for implementing the same method. The unmanned lodging house device includes a card reader, a door lock, a room status display, a user interface, and a controller. The controller receives a payment approval information and a room secret number through the card reader, and sets the received room secret number as a secret number of the door lock after the user confirms the received room secret number through the user interface, and further enables the room status display unit to display the room status when the setting of the secret number of the door lock is completed.

Abstract: Disclosed are a channel equalizer and digital television receiver using the same. The equalizer comprises a channel estimator, a channel distortion compensator and noise canceller. The channel estimator estimates an impulse response of a transmission channel from a received signal. The channel distortion compensator transforms and processes the received signal and the estimated impulse response. The noise canceller predicts and eliminates amplified noise generated during equalization.

Abstract: An alcohol vapor dryer system includes a vapor generating chamber, a heater, a process chamber, a gas supplier, a drain vessel, and a suction device. The vapor generating chamber of cylindrical shape contains liquid alcohol supplied from an outer source and includes a fan installed above the surface of the liquid alcohol. The heater installed below the vapor generating chamber heats the liquid alcohol contained in the vapor generating chamber at a temperature lower than the boiling point of the liquid alcohol. The process chamber communicates with the vapor generating chamber through a plurality of fluid ducts and includes a body and a cover plate for covering the body. The gas supplier generates heated nitrogen gas and supplies the gas in order to transfer the heated nitrogen gas and the alcohol vapors to the fluid ducts which are connected to the process chamber. The drain vessel communicates with the bottom of the body of the process chamber and also with the bottom of the vapor generating chamber.

Abstract: A processor 10 for selectively performing multiplication or division of two inputs comprises a pre-processing unit 20 for modifying the signs of the inputs; an aligning unit 30 for aligning bit positions of the sign-modified inputs; an arithmetic unit 40 for selectively performing multiplication or division of the sign-modified and bit-aligned inputs; a post-processing unit 50 for modifying the signs of outputs from the arithmetic unit; and a control unit 70 for controlling operations of the pre-processing unit, aligning unit, arithmetic unit, and post-processing unit.