Abstract: Provided is an apparatus and method for detecting timing errors based on characteristics of cyclic correlation. The apparatus and method can detect the timing errors of many users by using the cyclic characteristics of a midamble code at a time and detects the timing errors based on the characteristics of cyclic correlation to reduce the time required for detecting the users and lower the complexity in terms of Hardware. The apparatus includes a detection section controller, a register, a midamble generator, a midamble shifter, an accumulator, an adder, a shift register and a timing error detector.

Abstract: The invention provides a method of generating a downlink signal and searching a cell on the basis of the downlink signal in an OFDM-based cellular system. The downlink signal includes a plurality of synchronization blocks each having a plurality of sub-frames, and a synchronization pattern composed of a combination of a cell group identification code for identifying a cell group and a frame synchronization identification code for indicating a frame start point is generated in each of the synchronization blocks. Different frame synchronization identification codes are allocated to the synchronization blocks.

Abstract: 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.

Abstract: Provided are a cell search method, a frame transmission method thereof, and a forward link frame structure thereof.

Abstract: The present invention provides a coding device of a low-density parity-check (LDPC) code for simply coding information data without generating a code generator matrix. The coding device forms a parity-check matrix having two sub-matrixes. At this time, the first sub-matrix is a random matrix or a structural matrix. The second sub-matrix is a structural matrix having two 1s in each column. Parity data is calculated by using the structural second matrix without calculating an inverse matrix of the second matrix when temporary data is generated by using the first sub-matrix with reference to the information data. Code data is generated from the parity data and the information data and is transmitted.

Abstract: The present invention provides an OFDM symbol generating apparatus. The OFDM symbol generating apparatus generates a plurality of weight-applied symbol groups by applying a plurality of weights to a digital modulation symbol group, and generates a plurality of IFFT symbol groups by performing an IFFT operation on the plurality of weight-applied symbol groups. Subsequently, an IFFT symbol group having the minimum PAPR is selected from among the plurality of IFFT symbol groups such that a characteristic of a PAPR can be improved without reducing data transmission speed.

Abstract: The present invention relates to an orthogonal frequency division multiplexing (OFDM) signal transmitting and receiving device, in which a peak to average power ratio characteristic is improved without reducing a data D transmission speed. The OFDM signal transmitting device separates a digital modulated symbol as a real part and an imaginary part, and performs discrete cosine transform (DCT) and discrete sine transform (DST) operations respectively for real and imaginary part symbols, performs an inverse fast Fourier transform operation, and generates an OFDM symbol. The OFDM signal receiving device performs a fast Fourier transform operation for the OFDM symbol, and performs an inverse DCT operation and an inverse DST operation, performs a digital demodulating operation, and generates a final binary data symbol.

Abstract: An image photographing apparatus includes a body, on which a tape cassette is removably mounted, and a camera unit installed in the body and provided with a plurality of camera sections. The camera sections have different pixel numbers and the camera sections are independently driven. The image photographing apparatus also includes a mode sensing unit to sense a photographic mode to correspond to at least one of the camera sections, and a control unit to select a photographic mode according to a signal transferred from the mode sensing unit and to drive a camera unit to correspond to the selected photographic mode. The image photographing apparatus includes a display unit provided in the body to show an image photographed by at least one of the camera sections.

Abstract: A hinge apparatus for an image photographing apparatus wherein the hinge apparatus rotatably connects a housing with respect to a main body so that the housing can rotate in a predetermined rotation range. The hinge apparatus includes a fixing bracket secured to the main body, a hinge unit secured to the housing and connected to the fixing bracket to be reciprocatingly rotatable within a predetermined angle, a shaft member for rotatably connecting the hinge unit and the fixing bracket so that the hinge unit and the fixing bracket can be rotated with respect to each other, and a sensing unit disposed on the hinge unit and/or the fixing bracket to sense the relative rotational range of the hinge unit with respect to the fixing bracket.

Abstract: A hinge apparatus includes a first hinge unit having a first hinge shaft rotatably connected to a first electronic unit, a second hinge unit having a second hinge shaft with a hollow to connect a second electronic unit to be rotatable in a predetermined angle to the first hinge shaft, and a signal connecting unit inserted into the hollow of the second hinge unit to electrically connect the first and the second electronic units with each other. The signal connecting unit may be a coaxial cable. With this construction, when the electronic units are rotated in plural directions to each other, the apparatus can prevent damage to the signal connecting unit, which electrically connects the electronic units with each other, and can minimize EMI influence.

Abstract: A heat-shrinkable polyester film comprising styrene acrylic polymer in an amount ranging from 0.05 to 5% by weight based on the total weight of the film together with 2,2-dimethyl(?1,3-propane)diol-copolymerized polyester and polytrimethylene terephthalate exhibits superior properties suitable for labeling or shrink-wrapping containers.

Abstract: A symbol synchronization apparatus and method for synchronizing symbol digitally is disclosed. In the present invention, digital symbols are generated by an A/D converting unit. Based on digital symbols, a symbol timing value is calculated. The symbol timing value is used for determining a best symbol timing. According to the best symbol timing, a clock phase is determined and A/D converting unit uses newly determined clock for generating digital symbols. As a result, the present invention can perform an over-sampling process in higher resolution than a sampling frequency by using only one A/D converter. Therefore, the present invention may increase economic efficient and reduce complexity of hardware.

Abstract: Provided is an apparatus and method for detecting timing errors based on characteristics of cyclic correlation. The apparatus and method can detect the timing errors of many users by using the cyclic characteristics of a midamble code at a time and detects the timing errors based on the characteristics of cyclic correlation to reduce the time required for detecting the users and lower the complexity in terms of Hardware. The apparatus includes a detection section controller, a register, a midamble generator, a midamble shifter, an accumulator, an adder, a shift register and a timing error detector.

Abstract: The present invention relates to a transmitter in an OFDM system for improving the PAPR, and a method thereof. According to the exemplary embodiment of the present invention, channel encoding is performed in order to correct a data transmission error of a radio channel, a predetermined bit of the channel encoded data is bit-inverted by using a mask bit or a mask bit sequence, and a PAPR of the signal is reduced. Accordingly, reduction of transmission efficiency which has been generated in block coding and DSI methods is not generated when the signal is transmitted because an additional bit is not required.

Abstract: The present invention provides a coding device of a low-density parity-check (LDPC) code for simply coding information data without generating a code generator matrix. The coding device forms a parity-check matrix having two sub-matrixes. At this time, the first sub-matrix is a random matrix or a structural matrix. The second sub-matrix is a structural matrix having two 1s in each column. Parity data is calculated by using the structural second matrix without calculating an inverse matrix of the second matrix when temporary data is generated by using the first sub-matrix with reference to the information data. Code data is generated from the parity data and the information data and is transmitted.

Abstract: An image photographing apparatus for recording and reproducing an image of a subject includes a main body and a button unit movably mounted on one side of the main body. The button unit has at least one operation button. A guide member is mounted on the main body to guide movement of the button unit. A user may move and fix the button unit in a desired position, thereby providing a more convenient and stable image photographing apparatus and improving image quality.

Abstract: An image photographing apparatus having a grip cover and a grip cover mount part on a deck door, for mounting the grip cover. The apparatus comprises a prominence, a depression and a hook on the grip cover, for holding the apparatus. An adjustment hole is configured on the grip cover mount part to releasably engage the grip cover with the hook and adjust a travel system adjustment member.

Abstract: A door device to open and close a memory card slot of an image photographing apparatus has a door rotatably disposed at an entrance of the memory card slot to open and close the slot. The door is elastically biased in the direction of closing the slot entrance. The door has at least one friction pad for holding the memory card of the slot by friction force. Therefore, friction force is applied by friction pads of the door to a memory card inserted in the slot such that the memory card may be prevented from moving out of the normal position during use.

Abstract: A multiple switch integrated device of a digital camcorder comprises a switch unit having a plurality of switch assemblies mounted on an outer casing of the camcorder to expose their buttons to the outside for controlling the central processing device to perform functions corresponding to operations of the buttons. A plurality of first electric connection parts electrically connects the plurality of switch assemblies to one another in series. A second electric connection part electrically connects with one of the plurality of switch assemblies and includes a connection terminal connected to a socket formed on the main substrate. The first and the second electric connection part can include a flexible printed cable. Since the multiple switch integrated device integrates a power on/off switch, a mode converting switch, a zoom switch, a shutter switch and/or a slow shutter switch with one another, the structure and assembly procedure can be simplified.

Abstract: An OLPF switching apparatus has an OLPF fixing part that is pivotably fixed to a housing of a lens assembly and has a first OLPF for passing light of a first wavelength among incoming image information, and a second OLPF for passing light of a second wavelength among the incoming image information. A switching lever is pivotably fixed to the housing and has a first end which moves in relation to the movement of the OLPF fixing part to selectively locate the OLPF fixing part in one of a first OLPF setting position and a second OLPF setting position. An operating part is slidably disposed in an outer casing which seals the lens assembly. A link part is connected with the operating part and a second end of the switching lever forming a predetermined angle with respect to the first end.