Abstract: An apparatus is provided for decoding a Low-Density Parity Check (LDPC) code in a communication system. In the LDPC decoding apparatus, an edge memory stores a message delivered through an edge between a variable node and a check node. A node memory stores a node value. A node processor performs a node processing operation using information stored in at least one of the node memory and the edge memory, stores a check node value generated by performing the node processing operation in the node memory, and stores a message generated by performing the node processing operation in the edge memory. A switch switches outputs of the node memory and the node processor through a permutation operation. A parity check verifier parity-checks an output from the node memory. A controller provides a control signal for controlling the node processor.

Abstract: Disclosed is a method for detecting a user in a communication system. The method includes selecting i ranging sub-carrier signals among k sub-carrier signals upon which a k-point fast Fourier transform (FFT), has been performed multiplying the i ranging sub-carrier signals by a ranging code, performing k-point inverse fast Fourier transform (IFFT) on the i ranging sub-carrier signals multiplied by the ranging code, and (k-i) 0s, detecting a power of each of the IFFT-processed k point signals, estimating a power of a desired received signal and a power of an interference signal by using powers of the k point signals according to a predetermined scheme, and detecting a user depending on the power of the desired received signal and the power of the interference signal.

Abstract: Provided are an apparatus and method for transmitting/receiving signal, supporting a variable coding rate, in a communication system. The method includes receiving an information vector, generating a child parity check matrix based on a parent parity check matrix according to a coding rate to be applied for generating a block Low Density Parity Check (LDPC) codeword using the information vector, and encoding the information vector into the block LDPC codeword according to the child parity check matrix.

Abstract: Disclosed is a mobile communication device. The mobile communication device includes a first body section having a keypad arranged on a first upper surface thereof; and a second body section connected to the first body section and having a display screen arranged on an upper surface thereof, the second body section linearly sliding from a first position where the second body section overlays the first body section to a second position where the second body section exposes a first part of the keypad, the first part providing input functions of numerals and letters, the second body section rotating while facing the first upper surface from the first position to a third position where the second body section fully exposes the keypad. The communications device can selectively provide QWERTY keyboard arrangement, thereby allowing increasingly integrated electronics and complex features sufficiently utilized and long text messages easily edited.

Abstract: For stereo matching, edge images are extracted from stereo images. An edge mask matching an edge form of a window relating to a reference edge pixel is searched for from among predefined edge masks mapped to predefined edge forms capable of appearing within a predetermined size window having a center of the reference edge pixel among edge pixels of a reference edge image of the edge images. Among edge pixels of a search edge image of the edge images, an edge pixel located at a center of a window having an edge form matching the searched edge mask is searched for and is set to a corresponding edge pixel mapped to a corresponding point with respect to the reference edge pixel. Among the edge pixels of the reference edge image, the reference edge pixel is used to currently search for the corresponding edge pixel from the search edge image.

Abstract: Provided is a speaker device for a portable terminal. The speaker device includes a speaker housing which provides a mounting space for accommodating a speaker unit and a resonating space connected to the mounting space and located around the mounting space. The speaker device solves the disadvantages of a small-size speaker unit, i.e., problems in producing a sound in a bass region, thereby producing a “live” sound. Moreover, the characteristics of a sound can be improved using the speaker housing, without addition of a separate speaker unit or addition or change of software or a circuit, thereby improving the performance of a speaker device of the portable terminal at low cost.

Abstract: Provided is a method for selecting a receiver mode of a mobile terminal having two receivers and that can receive a signal using either or both of the two receivers depending on a channel environment. A method for selecting a receiver mode of a wireless communication terminal having at least two receivers includes computing at least one parameter for determining the receiver mode from a received signal; comparing the at least one parameter with a preset threshold; and selecting one only of a single receiver mode in which either of the two receivers is activated and a dual receiver mode in which both of the receivers are activated according to the comparison result. The method enables a receiver mode to switch between single and dual receiver modes adaptively according to a wireless environment, thus achieving stable signal reception without compromising reception sensitivity.

Abstract: Disclosed is a method for enabling a mobile station existing in a serving cell area to perform a handover procedure in a broadband mobile communication system including the mobile station, a serving base station providing a service to the mobile station, and one or more target base stations containing at least one target cell area overlapping with the serving cell area occupied by the serving base station. The method includes transmitting a handover request message from the mobile station to the serving base station when it is detected that a performance of a handover is necessary; and transmitting a handover indication message containing handover cancel information to the serving base station when the mobile station determines a cancel of the handover while the mobile station is being handed over to one or more target base stations by the serving base station.

Abstract: Disclosed is a method for transmitting a message during a PTT call service in a mobile communication terminal. The method includes checking whether a message transmission key is input during a PTT call service; when the message transmission key is input, displaying a screen containing a plurality of preset messages; when one message is selected, creating an SMS message using the selected message and transmitting the created SMS message to a pre-selected participant; and when a direct message creation is selected, receiving a selection of a participant to whom a message is to be transmitted, receiving an input message, creating an SMS message using the input message, and transmitting the created SMS message to the selected participant. Accordingly, even a participant having no right to speak can inform other participants of his or her own state.

Abstract: A method of determining cell reselection in a mobile communication terminal and an apparatus therefor are provided. The method includes receiving system information to calculate a threshold value in consideration of channel quality, a cell reselection weight value, and a cell reselection reference value; and determining whether to perform cell reselection using the threshold value in consideration of the channel quality, the cell reselection weight value, and the cell reselection reference value in a specific wireless environment.

Abstract: Disclosed is an apparatus and a method for transmitting/receiving a signal in a communication system, which generates an Affine Permutation Matrix-Low Density Parity Check (APM-LDPC) codeword by encoding an information vector in an APM-LDPC encoding scheme which is a preset structured LDPC encoding scheme, and detects the information vector by decoding the signal in a decoding scheme corresponding to the APM-LDPC encoding scheme, thereby making it possible to generate a Low Density Parity Check (LDPC) code in the form of maximizing a girth while minimizing complexity.

Abstract: An apparatus and method for controlling amount of information to be fed back in a multiple antenna system in a multi-user environment. The apparatus includes a channel estimator which estimates channel values by using an input signal; a Singular Value Decomposition (SVD) operator which decomposes singular values from the estimated channel values; and a feedback determining unit which uses the singular values to compute channel capacity that can be obtained according to the amount of channel information to be fed back, and selects the channel information to be fed back by using the channel capacity.

Abstract: The present invention relates to an accounting method and an accounting apparatus in a mobile communication system. The amount of radio resources and traffic used by a mobile terminal of each subscriber accessing a base station can be measured and analyzed without changing a structure of the mobile communication system. In addition, since a provider who does not own an IP network and thus uses a leased network of an existing provider can measure and analyze the amount of traffic used by a mobile terminal in the leased network regardless of an IP network of the existing provider, a more precise accounting reference can be provided to the corresponding provider.

Abstract: A scheduling method is provided for processing data in a communication system. The method includes performing downlink MAP (DL-MAP) decoding; generating a configuration table through the DL-MAP decoding; and processing data in a predetermined unit according to the generated configuration table.

Abstract: A headset worn is provided to be on an ear in such a manner that a speaker is adhered to the ear. The headset includes a headset body; a hook unit for adhering and fixing the headset body to a user's ear part; a key positioned at a part of the headset body such that its key top protrudes; and a touch region having elasticity, and provided to maintain a distance from the key while facing the key, wherein, as the touch region is pressed, the key is pressed and enabled at the same time.

Abstract: In a base station of an IEEE 802.16 Wireless MAN-based portable Internet system, a forward packet scheduling method and apparatus is provided. The portable Internet system portable Internet service includes a user terminal AT for providing a portable Internet service, a base station AP for supporting an inter-user terminal wireless access and network connection, and a packet access router PAR for performing a mobility control and packet routing function of each user terminal AT. The forward packet scheduler includes a packet-based subsidiary scheduling part for considering a real-time service and a user-based scheduling part for ensuring fairness and increasing system efficiency (throughput). After finishing the 2-step scheduling, the generated frame data are transmitted though a physical layer to a wireless user terminal.

Abstract: An apparatus and method for transmitting data. The method for transmitting data includes compressing data to be transmitted and configuring a plurality of packets, arranging the packets such that the entropy mean between the packets neighboring in any one side approximates to a reference entropy set in proportion to the maximum data processing calculation amount of a receiving side portable terminal, referring to the compression entropy of each of the packets, and setting a transmission order in accordance with the arranged order; and transmitting the packets in accordance with the transmission order.

Abstract: A portable terminal is equipped with a first housing, a second housing and a hinge device, the second housing being coupled to one end of the first housing and rotating about a hinge axis extending in a longitudinal direction of the first housing, the hinge device rotatably coupling the first housing and the second housing, the hinge device including: a first hinge base mounted on the first housing or the second housing; a second hinge base mounted on the second housing or the first housing, coupled oppositely to the first hinge base, and rotating about the hinge axis; and a hinge stopper mounted adjacent to the second hinge base, and pivoting around the hinge axis as the second hinge base rotates, wherein the hinge stopper is engaged with the first hinge base in at least one point while the second hinge base rotates, and thus stops rotation of the second hinge base.

Abstract: Disclosed are an apparatus and a method for decreasing a channel change time in a digital broadcasting reception terminal. Starting time information of at least one non-reference channel is selected. When the user selects a non-reference channel, broadcast data thereof is received by using the collected starting time information. The apparatus extracts time offset values between a starting time of a current reference channel and that of each at least one non-reference channel, and then obtains the starting time of each non-reference channel by using the extracted time offset values. When a channel change is performed, the starting time of the non-reference channel is established to receive broadcast data based on the starting time according to a corresponding time offset value. Hence, a time period required for a channel change is significantly reduced.

Abstract: A digital broadcast receiver and broadcast data display method enabling simultaneous display of multi-channel visual images are disclosed. The broadcast data display method includes receiving digital broadcast data on a plurality of channels; simultaneously outputting on a single screen real-time broadcast data of a selected channel and still images of the remaining channels; and periodically updating the still images of the remaining channels. Thereby, up-to-date multi-channel visual images are simultaneously output. Hence, the user can easily perform channel selection and channel switching.