Abstract: A method for generating a key stream according to an embodiment includes generating r round keys that are each N-dimensional integer vectors including elements of an integer set defined based on a prime number t, based on a random bit string, an encryption counter, and a secret key that is an N-dimensional integer vector consisting of elements of the integer set , generating a first round output vector x1 by performing a modular addition operation on an initial vector and a first round key RK1 of the r round keys with the prime number t as a modulus, and generating a key stream that is an N-dimensional integer vector consisting of elements of the integer set from the first round output vector x1 by using a second to r-th round keys of the r round keys, and one or more first round functions and a second round function.

Abstract: An automatic gain control apparatus and method for a compressed mode in a MIMO system are provided. The method includes determining power at a first frequency band using a first receiver, simultaneously determining power at a second frequency band using a second receiver in a compressed mode, if the second receiver changes a power determination frequency band into the first frequency band, correcting the power determination value of the first receiver, and applying the corrected power determination value of the first receiver to the second receiver.

Abstract: An apparatus and method for measuring a Signal-to-Interference-plus-Noise Ratio (SINR) by controlling a residual gain in a high speed packet access system are provided. The apparatus includes a gain controller for measuring an intensity of a signal outputted from a residual gain controller, for outputting a gain control signal for controlling a gain of an interval of a preset gain resolution of a radio frequency integrated circuit according to the intensity of measured signal, and for outputting a residual gain value for controlling a residual gain less than the preset gain resolution, wherein the radio frequency integrated circuit gain-controls a signal inputted according to the gain control signal, and the residual gain controller multiplies the gain-controlled signal by the residual gain value to compensate the residual gain.

Abstract: An apparatus and method for simplifying 3-Dimensional (3D) mesh data are disclosed. The method includes measuring discrete curvature at each point of received 3D mesh data, calculating an error based on distance-curvature error metrics including the discrete curvature, first sorting a low curvature one of the calculated error values in a heap in ascending order, selecting a minimum error among the calculated errors, determining if the minimum error is less than a threshold, contracting an edge if the selected minimum error is greater than the threshold, and recalculating an error of a surface neighboring to a surface on which the contracted edge belongs and re-sorting the calculated error values.

Abstract: An apparatus and method for measuring a Signal-to-Interference-plus-Noise Ratio (SINR) by controlling a residual gain in a high speed packet access system are provided. The apparatus includes a gain controller for measuring an intensity of a signal outputted from a residual gain controller, for outputting a gain control signal for controlling a gain of an interval of a preset gain resolution of a radio frequency integrated circuit according to the intensity of measured signal, and for outputting a residual gain value for controlling a residual gain less than the preset gain resolution, wherein the radio frequency integrated circuit gain-controls a signal inputted according to the gain control signal, and the residual gain controller multiplies the gain-controlled signal by the residual gain value to compensate the residual gain.

Abstract: An automatic gain control apparatus and method for a compressed mode in a MIMO system are provided. The method includes determining power at a first frequency band using a first receiver, simultaneously determining power at a second frequency band using a second receiver in a compressed mode, if the second receiver changes a power determination frequency band into the first frequency band, correcting the power determination value of the first receiver, and applying the corrected power determination value of the first receiver to the second receiver.

Abstract: A method and an apparatus are provided for managing cell-by-cell demodulation timing of an asynchronous user equipment (UE) for demodulating multipath signals, received from a plurality of cells, in a plurality of fingers. Mapping information, indicating fingers mapped on a cell-by-cell basis, and demodulation information and demodulation timing information for the plurality of cells are acquired. The fingers are grouped on a cell-by-cell basis according to the mapping information. Demodulation information for an associated cell is provided to each of the grouped fingers. A signal received from the associated cell is demodulated in the grouped fingers by using the demodulation information for the associated cell.

Abstract: An apparatus and method for simplifying 3-Dimensional (3D) mesh data are disclosed. The method includes measuring discrete curvature at each point of received 3D mesh data, calculating an error based on distance-curvature error metrics including the discrete curvature, first sorting a low curvature one of the calculated error values in a heap in ascending order, selecting a minimum error among the calculated errors, determining if the minimum error is less than a threshold, contracting an edge if the selected minimum error is greater than the threshold, and recalculating an error of a surface neighboring to a surface on which the contracted edge belongs and re-sorting the calculated error values.

Abstract: A cell search apparatus and method in a mobile communication system. After a UE acquires slot boundary timing and frame boundary timing to a Node B, it acquires its scrambling code number and scrambling code timing. After the initial cell search, the UE performs multi-path search by searching a first area with respect to the scrambling code timing. During reacquisition in a sleep state, the UE searches a second area wider than the first area with respect to a scrambling code timing acquired before the sleep state. The UE performs neighbor cell search by selectively using the initial cell search and the multi-path search according to whether the Node B provides information or what information it provides.

Abstract: An apparatus deblock filters in a digital moving picture processing system with a macro block having a predetermined number of pixel blocks. An external memory controller reads a current sub-block of a current macro block from entire image data stored in an external memory, and delivers image data of an internal pixel block constituting the current sub-block and an external pixel block to a filter-dedicated memory. The filter-dedicated memory stores the delivered image data. A filtering operator performs horizontal filtering on the current sub-block using the stored image data according to a predetermined order, and performs vertical filtering on the current sub-block according to a predetermined order when the horizontal filtering is completed. The external pixel block includes pixel blocks adjacent to a top and a left side among pixel blocks adjacent to the internal pixel block.

Abstract: A method and apparatus for controlling a backlight of a portable display device for a portable communication system are disclosed. The method for controlling a backlight of a portable display device includes calculating a power adjustment coefficient by using information sensed according to a state where the portable display device makes contact with a human body, and adjusting power to be supplied for the backlight according to the calculated power adjustment coefficient. The portable display device controls the amount of power to be supplied according to states where the portable display device makes contact with a human body or is close to a human body to provide only a required amount of power, thus, it is possible to supply power for a longer period of time.

Abstract: An apparatus and method for generating reference timings. Each of at least two Node Bs transmits a first channel signal for providing a reference timing and a second channel signal different from the first channel signal and a UE has a plurality of fingers for demodulating the first channel signals. A first timing generator receives an SFN of a reference Node B having a communication link established with the UE, selects a first channel FB timing from a reference finger, and generates an SFN reference timing based on the SFN and the selected first channel FB timing. A second timing generator generates a second channel FB timing to demodulate the second channel signal of the reference Node B from the selected first channel FB timing through offset control. A third timing generator generates an uplink channel FB timing having a predetermined offset from the second channel FB timing.

Abstract: A method of increasing the waiting time of a mobile terminal by reducing power consumption for a cell search in a discontinuous reception mode. In an embodiment of the invention, the strengths of signals from neighbor cells are measured and compared with a first threshold. Then a cell search is performed on only neighbor cells having signal strengths higher than the first threshold. In a second embodiment of the invention, a cell search is not performed if the signal strength of an active set is higher than a second threshold in a discontinuous reception mode. In a third embodiment of the invention, an offline cell search is performed in a discontinuous reception mode in the last step of three conventional cell search steps.

Abstract: An apparatus and a method for performing a bit de-collection according to a hybrid automatic retransmission request are disclosed. The apparatus includes a column counter for increasing one column every four bits and outputting a position of a current column in response to received bit sequences; a state detector for outputting state information of the current column by means of an output value of the column counter, a parameter denoting a number of rows to which systematic bits have been assigned, and a parameter denoting a number of columns to which the systematic bits have been assigned; and address generators for generating write addresses required for performing a write operation and read addresses required for performing a read operation according to the state information output from the state detector.

Abstract: A cell search apparatus and method in a W-CDMA mobile communication system. The cell search apparatus and method performs a first cell search step, a second cell search step, and a third cell search step using a slot count value and a lower count value, counted by an index counter after being initialized upon power up of a UE (User Equipment), thereby determining a scrambling code for a Node B. Further, the cell search apparatus and method manages neighboring Node Bs by performing a multipath search.

Abstract: A high speed input buffer device for a turbo decoder and an input method thereof are provided.

Abstract: A graphics system and a memory device for three-dimensional (3D) graphics acceleration, and a method for 3D graphics processing, are provided. In a memory device in a graphics system for 3D graphics processing, a memory structure includes a first memory area allocated to a texture buffer for storing texture data, and a second memory area allocated to a frame buffer for storing frame data in pixels. A comparator controls the memory structure to operate as the texture buffer if an input address to the memory structure indicates the first memory area and controls the memory structure to operate as the frame buffer if the input address indicates the second memory area. If the memory structure operates as the frame buffer, an ALU performs depth comparison or alpha-blending on input frame data and frame data read from the frame buffer.

Abstract: A method and an apparatus are provided for managing cell-by-cell demodulation timing of an asynchronous user equipment (UE) for demodulating multipath signals, received from a plurality of cells, in a plurality of fingers. Mapping information, indicating fingers mapped on a cell-by-cell basis, and demodulation information and demodulation timing information for the plurality of cells are acquired. The fingers are grouped on a cell-by-cell basis according to the mapping information. Demodulation information for an associated cell is provided to each of the grouped fingers. A signal received from the associated cell is demodulated in the grouped fingers by using the demodulation information for the associated cell.

Abstract: An apparatus and method for providing a bring-up simulation game in a mobile terminal that makes a call over a mobile communication network are provided. In the apparatus, a call detector monitors an incoming or outgoing call and collects bring-up call information from the monitored call. A call decider analyzes bring-up call information associated with a phone number mapped to a predetermined character among the collected bring-up call information, numerically quantizes the analyzed bring-up call information, and determines the growth stage of the character according to the numerical bring-up call information. A character controller updates the appearance and state of the character according to the growth stage of the character. A display displays the updated appearance and state of the character.

Abstract: An apparatus and method for performing a bring-up simulation to bring up a character are provided. In the apparatus, a sensor measures at least one of an ambient temperature of the mobile terminal, a remaining battery power of the mobile terminal and an amount of vibrations of the mobile terminal, a controller compares the measured value received from the sensor with a predetermined threshold, calculates bonus points and penalty points according to the measured value, and controls the state of a character according to the calculated bonus and penalty points, character generator sets or updates the state of the character according to internal conditions of the mobile terminal, external conditions of the mobile terminal and user interaction with the character via the mobile terminal corresponding to a control signal received from the controller, and a display for displaying the character in accordance with the state and growth stage of the character.