Abstract: Provided is a handover method of a wireless communication system using a hierarchical cellular scheme. In the method, signal quality of a serving node is measured, so that whether to start scanning for a handover is determined. When the scanning for the handover starts, signal qualities of a serving cell including the serving node and one or more neighbor cells are measured through a first preamble including a first identifier for distinguishing a cell. An intra-cell handover or an inter-cell handover is selected using the signal qualities of the serving cell and the neighbor cells. Therefore, a terminal can easily distinguish between the inter-cell handover and the intra-cell handover, and an overhead during a handover can be reduced because an intra-cell handover procedure is simplified.

Abstract: A receiver in a multiple-input multiple-output (MIMO) system is provided. The receiver includes a channel estimator estimating a channel based on a receiving signal, a minimum mean square error (MMSE) based reciprocal log likelihood ratio (R-LLR) calculator connected with the channel estimator and calculating an R-LLR based on the receiving signal and the estimated channel, and a channel decoder connected with the MMSE based R-LLR calculator and decoding the channel and the receiving signal based on the calculated R-LLR, wherein the R-LLR is calculated based on the reciprocity.

Abstract: An electronic programming guide (EPG) providing apparatus and method, in which an EPG is configured as a 3D form to facilitate a search for broadcasting program information included in the EPG. The EPG providing apparatus includes an EPG screen configuring unit and a control unit. The EPG screen configuring unit configures an EPG screen such that broadcasting program information is displayed on at least three faces of a 3D polyhedron. The control unit controls the EPG screen configuring unit to configure the EPG screen such that broadcasting program information corresponding to another broadcasting time zone or another broadcasting channel is displayed on the EPG screen based on a user input signal requesting a search for the broadcasting program information corresponding to another broadcasting time zone or another broadcasting channel.

Abstract: An electronic programming guide (EPG) providing apparatus and method, in which an EPG is configured as a 3D form to facilitate a search for broadcasting program information included in the EPG. The EPG providing apparatus includes an EPG screen configuring unit and a control unit. The EPG screen configuring unit configures an EPG screen such that broadcasting program information is displayed on at least three faces of a 3D polyhedron. The control unit controls the EPG screen configuring unit to configure the EPG screen such that broadcasting program information corresponding to another broadcasting time zone or another broadcasting channel is displayed on the EPG screen based on a user input signal requesting a search for the broadcasting program information corresponding to another broadcasting time zone or another broadcasting channel.

Abstract: An apparatus and method for receiving signals in a multiple-input, multiple-output (MIMO) wireless communication system is provided. A receiving end using as many as N Receive (Rx) antennas includes a first detector, as many as (N?2) nth detectors, and an Nth detector. A signal detection technique of the present invention has a low complexity and a throughput similar to that of a Maximum Likelihood (ML) scheme in a Multiple-Input Multiple-Output (MIMO) wireless communication system using a Spatial Multiplexing (SM) scheme.

Abstract: Provided are a method and apparatus for receiving remote control key data in a home network and requesting a server to perform an operation corresponding to the remote control key data. The method includes converting the remote control key data to a code which can be referred to in a web document received from the server, determining an operation corresponding to the code by referring to the web document, and requesting the server to perform the determined operation. Accordingly, even when an item corresponding to a function supported by the server is not displayed on a menu screen, a user receiving a service from the server using a client device in the home network can use the function by instinctively pressing a remote control key corresponding to the function.

Abstract: A receiver in a multiple-input multiple-output (MIMO) system is provided. The receiver includes a channel estimator estimating a channel based on a receiving signal, a minimum mean square error (MMSE) based reciprocal log likelihood ratio (R-LLR) calculator connected with the channel estimator and calculating an R-LLR based on the receiving signal and the estimated channel, and a channel decoder connected with the MMSE based R-LLR calculator and decoding the channel and the receiving signal based on the calculated R-LLR, wherein the R-LLR is calculated based on the reciprocity.

Abstract: A data processing method, an equalizer, and a receiver in a wireless communication system including a relay station are provided. The data processing method includes: receiving a base station signal from a base station; receiving a relay station signal from a relay station; determining a propagation delay between the base station signal and the relay station signal; generating an equalizing signal in which interference generated between the base station signal and the relay station signal is alleviated in consideration of the propagation delay; and recovering information bits transmitted by the base station from the equalizing signal. According to an exemplary embodiment of the present invention, it is possible to alleviate performance deterioration due to an interference problem generated in a relay system.

Abstract: A method and apparatus for effectively performing optimal connection configuration by recognizing the connection status between a video device and external peripheral devices. The method for identifying predetermined peripheral devices connected to a video device over serial communication control lines, includes, transmitting a command to establish connection of a current peripheral device having no given device ID to its upper peripheral device among the predetermined peripheral devices, and transmitting a command to disconnect a connection to its lower peripheral device; requesting unique device identification information to the predetermined peripheral devices; receiving a response to the request from the current peripheral device; and giving a device ID to the current peripheral device.

Abstract: A method and an apparatus for detecting a signal in a multi-antenna system using a spatial multiplexing are provided. The apparatus includes at least one antenna for receiving a signal, a channel estimator for estimating a channel using the received signal, a detector for calculating multiplication values commonly used to determine a Euclidean distance using the receive signal and channel information and for detecting a transmitted signal by calculating Euclidean distances of one or more candidate symbols using the receive signal and the determined multiplication values and a decoder for demodulating and decoding the detected signal. Hence, the computational complexity of the signal detection can be mitigated.

Abstract: The present invention relates to a method of detecting a candidate vector and a method of detecting a transmission symbol using the same. According to an embodiment of the present invention, in a multiple input multiple output (MIMO) system using spatial multiplexing (SM), a receiver selects candidate vectors corresponding to a layer located at a last row among a plurality of rearranged layers, and sequentially ranks constellation dots of a next layer for each of the selected candidate vectors. Then, a plurality of arbitrary constellation dots are selected from the ranked constellation dots, accumulated costs of the arbitrary constellation dots are calculated, and a candidate vector is selected in correspondence with a constellation dot having a minimal accumulated cost.

Abstract: The present invention relates to a method of calculating a log-likelihood ratio and a method of detecting a transmission signal. According to the present invention, when a transmission symbol candidate vector is detected on the basis of a received signal, a threshold value and an ML metric of each transmission symbol candidate vector are calculated and the ML metric that is larger than the threshold value is updated by the threshold value. Further, a log-likelihood ratio of the transmission signal bit is calculated using the updated ML metric and the threshold value, and a transmission signal is detected using the log-likelihood ratio.

Abstract: The present invention relates to an apparatus and method for estimating a channel in a wireless communication system. The apparatus according to the present invention includes an estimator for initially estimating a channel response value by using a predetermined signal among reception signals, a detector for detecting transmission signals by using the channel response value and an operator for updating the channel response value by using detected transmission signals, a detection accuracy and reception signals.

Abstract: Receiving apparatus and method in a Multiple-Input Multiple-Output (MIMO) wireless communication system are provided. The receiver having N-ary receive antennas includes a decomposer for decomposing a channel matrix to a matrix Q and a matrix R through a QR decomposition; a detector for determining a candidate group of an n-th phase by estimating a plurality of transmit signal vectors by substituting a plurality of transmittable symbols into symbol combinations of a candidate group of a (n?1)-th phase as an n-th symbol and detecting (n+1)-th through N-th symbols using characteristics of the matrix R; a calculator for calculating square Euclidean distance values between the transmit signal vectors and a receive signal vector; and a determiner for determining the candidate group of the n-th phase by selecting transmit signal vectors having the smallest square Euclidean distance value among the transmit signal vectors.

Abstract: Provided are a spatial multiplexing apparatus and method in a Multiple Input Multiple Output (MIMO) system. The spatial multiplexing detection method includes estimating channels of a received signal, and sorting the estimated channels in descending order according to a scheme; generating a subsystem of a minimum unit by nulling an arbitrary channel among the sorted channels; performing a modified maximum likelihood (MML) in the subsystem of the minimum unit to calculate a number of transmission signal vectors; and calculating Euclidean distances of the number of the transmission signal vectors, and selecting a transmission signal vector having a minimum Euclidean distance. Accordingly, the receiver exhibits a performance level similar to a Maximum Likelihood (ML) and can obtain the complexity similar to successive interference cancellation (SIC).

Abstract: An electronic device having a touch screen and an operation control method thereof are provided. The electronic includes a touch screen which receives a plurality of manipulations; and a controller which determines whether a second manipulation is made on a screen displayed on the touch screen during a predetermined time period after a first manipulation is made on the screen, and controls to perform an operation corresponding to the second manipulation instead of an operation corresponding to the first manipulation to be performed, if the second manipulation is made during the predetermined time after the first manipulation is made.

Abstract: A self-adaptive multiple-input multiple-output (MIMO) transmission/reception system includes a transmitter provided with a serial-to-parallel converter, channel encoders, a plurality of constellation mappers, and transmission power controllers, and a receiver provided with a transmission scheme selection device, a zero forcing/minimum mean square error (ZF/MMSE) detector, reception power controllers, constellation demappers, channel decoders and a parallel-to-serial converter. The transmission scheme selection device generates information regarding plural sets of information to be used, a constellation mapping scheme and transmission power and transmits the generated information to the associated units of the transmitter and receiver, thereby controlling the number of sub code streams, the constellation mapping scheme and the transmission power. The system and method provide superior performance and require minimal feedback information.

Abstract: A method and device for controlling slave devices with a master device. The device performs specific functions to control operations of slave devices with a master device, and includes a user input receiving unit that receives an input from a user, a memory unit that stores command sets, each command set corresponding to a series of operation controls of the master device or one of the slave devices, and a control unit that generates operation control signals of the master device or one of the slave devices when an operation control command set is selected, the operation control signals corresponding to the selected operation control command set.

Abstract: Detection of a signal in a receiver of a MIMO communication system includes a transmitter for signals transmission via K antennas and a receiver for receiving the signals via L reception antennas, such that L is greater than or equal to K and the system has a K×L-dimensional channel matrix, by converting the channel matrix into a plurality of matrixes having an upper triangle structure; dividing each of the matrixes into at least two sub-matrixes having a dimension lower than that of the channel matrix; detecting transmission symbols from corresponding antennas through decoding of a) lowest sub-matrix signal received which sub-matrix is constituted of components having only the channel characteristics of two antennas among the two sub-matrixes; and b) an upper sub-matrix signal using the transmission symbols; and outputting all of the detected transmission symbols, if transmission symbols by a highest sub-matrix among at least two sub-matrixes are detected.

Abstract: A method and apparatus are provided for managing content using a remote user interface (RUI). A method for a first RUI server to provide content to a second RUI server includes: receiving a request to provide content from a device using an RUI provided by the first RUI server; and transmitting access information of the content to the second RUI server, wherein the device is an RUI client to which RUIs from the first RUI server and the second RUI server are provided. Accordingly, since the providing and use of content between a plurality of RUI servers can be managed through RUIs in remote, every RUI client, which can receive an RUI, can control content transmission between the plurality of RUI servers.