Patent application number | Description | Published |
20090147747 | APPARATUS FOR SCHEDULING TRANSMISSION OF DATA UNIT IN BASE STATION - The present invention relates to a scheduling apparatus of a base station supporting Automatic Repeat reQuest (ARQ) method. In particular, the present invention discloses scheduling a data unit transmitted to a mobile station from a base station providing ARQ method for correcting an error in wireless data communication and generating a high rate frame. | 06-11-2009 |
20090154619 | FREQUENCY ERROR ESTIMATOR USING SECOND-ORDER LOOP FILTER AND OPERATING METHOD OF THE FREQUENCY ERROR ESTIMATOR - A frequency error estimator and an operating method of the frequency error estimator are provided. In the frequency error estimator and the operating method of the frequency error estimator, a frequency error between a transmitter and a receiver of a mobile communication system using a reference code is calculated, thereby improving the precision of estimation while reflecting variations in frequency over time. | 06-18-2009 |
20090157783 | NUMERICALLY-CONTROLLED OSCILLATOR CAPABLE OF GENERATING COSINE SIGNAL AND SINE SIGNAL ONLY USING COSINE LOOK UP TABLE AND OPERATING METHOD OF THE NUMERICALLY-CONTROLLED OSCILLATOR - A numerically-controlled oscillator (NCO) and an operating method of the NCO are provided. According to the NCO and the operating method of the NCO, it is possible to reduce the size of a lookup table memory by using a lookup table, which stores a plurality of phase compensation values for different phases obtained by using a cosine function or a sine function. Thus, it is possible to easily calculate cosine and sine addresses and cosine and sine signs and to quickly provide a cosine phase compensation signal and a sine phase compensation signal. | 06-18-2009 |
20090168705 | Method for Controlling Signal Power Level to Control Contention Beween Mobile Terminals, and Signal Power Level Controller in Orthogonal Frequency Division Multiplexing System - The present invention relates to a device for controlling a power level to control contention between mobile terminals in an uplink contention period in an orthogonal frequency division multiplexing access (OFDMA) system, and a method thereof. In the method, cell broadcasting information broadcasted from the base station is received by the mobile terminal, the transmission power information of the base station is obtained from the cell broadcasting information by the mobile terminal, a received power level of the received cell broadcasting information is obtained by the mobile terminal, transmission power of a signal transmitted to the base station is determined based on the transmission power information and the received power level, and the signal is transmitted to a contention period based on the determined transmission power. | 07-02-2009 |
20090316848 | APPARATUS FOR GENERATING CLOCK SIGNAL WITH JITTER AND TEST APPARATUS INCLUDING THE SAME - The present invention relates to an apparatus for generating a clock signal with jitter and a test apparatus including the same. The apparatus for generating a clock signal with jitter in accordance with the present invention includes a voltage-controlled crystal oscillator (VCXO) for generating an output signal including jitter components based on a driving power source having a specific waveform and a controlled voltage, a phase comparator for calculating a phase difference of a reference signal and the output signal, and a loop filter for generating the controlled voltage based on the phase difference calculated by the phase comparator. Accordingly, the PLL circuit unit generates a clock signal including jitter, so that the complexity and manufacturing cost of the apparatus can be reduced. | 12-24-2009 |
20100146021 | MODULAR-3 CALCULATION APPARATUS AND METHOD - A modular-3 calculation method for binary number includes: determining whether two 1s consecutive from MSB exist in a binary number, when a target value for modular-3 calculation is inputted, and generating a first binary number by substituting the two 1s with 0 whenever the consecutive two 1s exist; performing a modular-3 calculation on the first binary number; and determining the result of the modular-3 calculation. | 06-10-2010 |
20100273467 | METHOD FOR PROVIDING OF CALL TRANSFERRING SERVICE AND MOBILE TERMINAL USING THE SAME - A method of providing a call transfer service and a mobile terminal using the same are provided. When a call connection request signal transmitted to a mobile communication server through a PSTN is received, any one of previously stored phone numbers is selected and a service of transferring a call to the selected phone number according to the received call connection request signal is requested. Therefore, when call connection is requested, it is selected whether a call is to be transferred, when a call is transferred, a phone number to transfer a call can be dynamically selected according to a user situation, and thus user convenience according to call transfer can be improved. | 10-28-2010 |
20100293211 | APPARATUS AND METHOD FOR GENERATING MEAN VALUE - There is provided an apparatus for generating a mean value of N-bit input data in M-bit operations (M and N are integers, and M is greater than N) by dividing a total sum of the input data by number of times the data are input, including a ROM (Read Only Memory) storing therein, as denominators, quotients of dividing 2 | 11-18-2010 |
20110016168 | METHOD AND APPARATUS FOR MODULO N CALCULATION - A modulo N calculating method for an M1*M2-bit binary integer, wherein N, M1 and M2 are integers, includes the steps of dividing the M1*M2-bit binary integer into M1 bits and performing AND operation on each M1 bits and a specific binary integer; and changing a value of an output register depending on the AND operation result and storing the value thereto. A modulo N calculating apparatus includes an input unit for receiving an M1*M2-bit binary integer, wherein N, M1 and M2 are integers; and an AND operation unit for performing AND operation on the M1*M2-bit binary integer and a specific binary integer. Furthermore, when the M1 and the N may be 4 and 3, respectively, the specific binary value may be 1010 or 0101. | 01-20-2011 |
20110063026 | PRE-DISTORTION APPARATUS OF POWER AMPLIFIER AND METHOD THEREOF - A pre-distortion apparatus of a power amplifier includes: a pre-distortion unit configured to generate a pre-distorted signal of an input signal by calculating a magnitude of the input signal and outputting a complex correction coefficient corresponding to the calculated magnitude of the input signal, and provide the generated pre-distorted signal as an input of the power amplifier; and a complex correct coefficient update unit configured to generate an error signal by comparing an output signal of the power amplifier with the input signal and updating the complex correction coefficient to minimize a magnitude of the generated error signal, wherein the pre-distortion unit provides a constant bias value corresponding to the magnitude of the input signal as a bias of the power amplifier while updating the complex correction coefficient. | 03-17-2011 |
20110140881 | WIRELESS TERMINAL, METHOD FOR OPERATING WIRELESS TERMINAL, AND METHOD FOR OPERATING WIRELESS NETWORK - Provided is a method for operating a wireless terminal. In the method, an event is detected through a user interface. Location information is detected through a wireless channel in response to the event detection. The detected event information and the detected location information are outputted to the user interface. | 06-16-2011 |
20110142220 | APPARATUS AND METHOD OF PROCESSING A GHOST REGISTER - Provided is a ghost register processing apparatus and method. The ghost register processing apparatus may include a ghost setting determining unit to determine whether a ghost is set with respect to a caller identification (ID) that is received in response to a call request or a message reception and a reception information controller to store reception information associated with the caller ID in a ghost memory unit when the determining determines that the ghost is set. | 06-16-2011 |
20110145905 | APPARATUS AND METHOD FOR MANAGING WEB BASED SERVICE ACCOUNT - Provided is a method and apparatus for managing a web based service account. The web based service account management apparatus may select, from among web based service accounts, an account undesired to be exposed to others, and may display an account set with a hiding indication only when a user authenticated through a user authentication process desires to read the account. | 06-16-2011 |
20110197103 | DECODING METHOD AND APPARATUS OF RETRANSMISSION COMMUNICATION SYSTEM - A decoding method and apparatus of a retransmission communication system are provided. In the decoding method and apparatus, weights are applied to error data and retransmitted data, and the resulting error data and the resulting retransmitted data are chase-combined. Therefore, it is possible to reduce the coding rate of combined data and enhance the reliability of decoding. | 08-11-2011 |
20120154036 | DIGITAL PRE-DISTORTION POWER AMPLIFYING APPARATUS AND METHOD FOR DIGITALLY CONTROLLING SYNCHRONIZATION THEREOF - A digital pre-distortion (DPD) power amplifying apparatus and a method for digitally controlling synchronization of the DPD power amplifying apparatus, which includes a power amplifier, a bias shifter and a DPD unit, are provided. The method includes acquiring a DPD path delay time at a path along which an input signal is fed back to the DPD unit; delaying an input signal incoming to the power amplifier by the DPD path delay time and acquiring synchronization by delaying a bias signal a predetermined number of times until the bias signal and the delayed input signal are synchronized with each other; and in response to synchronization between the bias signal and the delayed input signal being established, pre-distorting the input signal according to a feedback signal output from the power amplifier. | 06-21-2012 |
20120154040 | PREDISTORTER FOR COMPENSATING FOR NONLINEAR DISTORTION AND METHOD THEREOF - The predistorter may include: a predistortion filter predistorting an input signal to provide an output signal; a predistortion output estimation unit estimating the characteristics of a nonlinear device based on a signal processed by the nonlinear device and the output signal, and calculating a desired output signal of the predistortion filter by using the estimated characteristics of the nonlinear device; and an adaptive algorithm driving unit comparing the output signal with the desired output signal to output an error as a comparison result, calculating a filter coefficient according to which the calculated error is minimized, and providing the calculated filter coefficient to the predistortion filter in order to update a filter coefficient of the predistortion filter. | 06-21-2012 |
20120154041 | PREDISTORTION APPARATUSES AND METHODS - Provided is a predistortion apparatus which performs predistortion by reflecting a memory effect when linearizing an output of a nonlinear device using a wideband signal. The predistortion apparatus includes a predistortion unit and a coefficient extraction unit. The predistortion unit selects and outputs one of outputs of the sub-predistorters as an output signal according to intensity of an input signal. The coefficient extraction unit selects one of a plurality of coefficient extractors according to intensity of a nonlinear signal which is generated in response to the output signal, extracts a plurality of predistortion coefficients with the nonlinear signal and the output signal, and delivers the extracted predistortion coefficients to the predistortion unit. Accordingly, the memory effect is reflected even when the input signal is a wideband signal. | 06-21-2012 |
20130163690 | METHOD FOR TRANSMITTING SIGNAL OF ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING TYPE, AND APPARATUS APPLIED TO THE SAME - The method for transmitting a signal of an orthogonal frequency division multiplexing type according to an exemplary embodiment of the present invention has a configuration allowing a radio unit (RU) to perform a component adding a compression component and a decompression component before/after a serial interface interlocking between a digital unit (DU) and the radio unit (RU) and a component inserting a cyclic prefix (CP) into a signal so as to secure orthogonality of an orthogonal frequency division multiplexing (OFDM) signal, in a structure in which a base station is physically divided into the DU and the RU. | 06-27-2013 |
20130251055 | APPARATUS AND METHOD FOR CONTROLLING DISTORTION SIGNAL AND SYSTEM BY USING THE SAME - Disclosed are a signal distortion component adjusting apparatus and method capable of adjusting error vector magnitude of subcarriers of a predetermined position by adjusting a signal distortion component occurring while decreasing a peak to average power ratio (PAPR) in a communication system of an orthogonal frequency division multiplexing (OFDM) technology or an orthogonal frequency division multiple access (OFDMA) scheme, and a system using the same. The present invention includes a signal distortion component adjusting unit to add an additional signal distortion component Pe((n+N/2) % N) to a signal distortion component e(n) that is obtained by subtracting a threshold Th value, set to decrease peak power, from an absolute value of a time domain signal x(n) of an input signal, and to thereby adjust the signal distortion component. The present invention may transmit a highly reliable signal by adjusting error vector magnitude of subcarrier of a frequency domain. | 09-26-2013 |
20130260754 | APPARATUS AND METHOD FOR POWER CONTROL USING SMALL BASE STATIONS - In a wireless communication system including a small base station and a macro base station, the small base station to perform power control may include: a user detector to detect a presence of a user terminal by monitoring whether a registration state of the user terminal served by the small base station corresponds to a registration complete state, a registration maintain state, or a registration release state; a control signal generator to generate a control signal for controlling power of at least one power device among a plurality of power devices included in a predetermined group, based on the detection result; and a control signal transmitter to transmit the control signal to the at least one power device among the plurality of power devices. | 10-03-2013 |