Abstract: An apparatus is provided for detecting a signal in a communication system using a Multiple Input Multiple Output (MIMO) scheme. The signal detection apparatus includes a detector for generating second matrixes by extending a first matrix composed of channel response vectors, generating specific matrixes by decomposing the second matrixes, generating a lattice point of vectors constituting the second matrixes, estimating a signal using the generated specific matrixes and lattice point, and detecting the estimated signal as a received signal if the estimated signal has a value within a predetermined allowable range.

Abstract: The present invention provides a driving method of a plasma display panel with ADS method comprising a reset period including an erase period, a rising period and a falling period, an address period and a sustain period, in which an auxiliary electrode is inserted between a scan electrode and a sustain electrode which are disposed in parallel on a front substrate, while an address electrode is disposed on a rear substrate facing the front substrate, wherein an erase pulse which rises from a first voltage to a second voltage is applied to the auxiliary electrode in the erase period. According to the present invention, the reset driving method is used in a four electrode AC PDP for a high efficiency, in which the reset discharge is stabilized by lowering the reset voltage, thereby, the address discharge is stabilized. Thus, the four electrode AC PDP having a high efficiency can be stably drived. The plasma display panel using the method uses a low reset voltage, so that the power consumption is reduced.

Abstract: A system and method for transmitting resource allocation information in a wireless communication system is provided. A transmitter transmits resource allocation information mapped to a current time interval in a first region to a receiver, and transmits resource allocation information mapped to a next time interval in a second region. When receiving the resource allocation information of the second region, the receiver notifies the transmitter whether the resource allocation information has been received. The transmitter receives notification that the resource allocation information of the second region has been received and transmits resource allocation information mapped to a subsequent time interval in the second region.

Abstract: A method is provided for transmitting/receiving data in a communication system. The method includes allocating, by a Base Station (BS), bands unused in a band Adaptive-Modulation-and-Coding (band AMC) scheme to Mobile Stations (MSs) of a diversity scheme, and transmitting data by adaptively using the band AMC scheme and the diversity scheme; and identifying, by an MS, resources allocated to the MS, and transmitting data by using either the band AMC scheme or the diversity scheme according to a result of the identifying.

Abstract: A method and system for allocating a channel are provided in a communication system including a plurality of Mobile Stations (MSs) and Base Stations (BSs) for providing a communication service to the plurality of MSs. A BS transmits an average Channel Quality Information (CQI) request to MSs. The MSs measure CQI with respect to their channels in response to the request from the BS, compute average CQI from the measured CQI, and transmit the average CQI to the BS. The BS selects a predefined number of MSs according to the average CQI received from the MSs and sets an MS group. The BS transmits a CQI request to the MS group. The MSs of the MS group transmit the CQI to the BS. The BS receives the CQI from the MS group and allocates a channel according to the CQI.

Abstract: A method for allocating a sub-channel in a wireless communication system is disclosed. The method includes measuring a moving velocity of each of mobile stations (MSs); selecting MSs to which a sub-channel is to be allocated; determining a resource allocation period for sub-channel allocation to the MSs using the measured moving velocity; calculating an average amount of data to be transmitted for the determined resource allocation period, and sending a channel quality information (CQI) request to the MSs; upon receipt of CQI in response to the CQI request, allocating a sub-channel satisfying the average data amount taking the CQI into account; and transmitting a control signal for the sub-channel allocation to the MSs.

Abstract: A method of reporting channel state information by a Mobile Station (MS) in a mobile communication system is disclosed. The method includes measuring a state of a downlink channel for the entire frequency band, determining a first Modulation and Coding Scheme (MCS) level corresponding to the measured channel state, and reporting the determined MCS level to a Base Station (BS).

Abstract: Disclosed is a method for transmitting an uplink signal by a mobile station in a mobile communication system using an OFDMA scheme. The method includes estimating a downlink channel status by using a signal received from a base station; determining a precoding matrix by using the estimated downlink channel status; and transmitting a signal obtained by multiplying an uplink signal to be transmitted by the precoding matrix to the base station.

Abstract: Provided are a system and a method for transmitting/receiving data in a communication system. The method includes calculating a processing matrix of a transmission unit for transmitting data, a processing matrix of a reception unit for receiving the data, a channel matrix formed by a plurality of transmission antennas and a plurality of reception antennas, and a parameter of the transmission data, when the data to be transmitted to the plurality of reception antennas via the plurality of transmission antennas is generated; determining a minimum value of a Minimum Mean Square Error (MMSE) according to the calculated matrixes and parameter; and transmitting/receiving the data using an MMSE multiplexing scheme based on the determined minimum MMSE value.

Abstract: Provided are a system and a method for allocating resources in a communication system. The method includes mapping a Transmission Time Interval (TTI) class according to channel information transmitted from a mobile station and service class information of the mobile station; and allocating resources by dynamically configuring a frame based on the mapped TTI class.

Abstract: A memory system includes a memory controller, a transmission bus, a power divider, a first memory chip, and a second memory chip. The transmission bus is coupled from the memory controller to a first node of the power divider for transferring signals. The first node of the power divider is coupled to a second node of the power divider via a first line, and the first node is also coupled to a third node of the power divider via a second line. The first memory chip is coupled to the second node via a first branch bus and the second memory chip is coupled to the third node via a second branch bus. Accordingly, reflected wave due to an impedance mismatching can be reduced to enhance the signal integrity.

Abstract: A method and apparatus for transmitting/receiving data in a communication system are provided, in which an MCS level is determined for data, a codeword including the data and a parity is generated by encoding the data using the determined MCS level, code symbols are generated from the codeword using IR scheme, and each of the code symbols is sent in a corresponding subframe.

Abstract: A signal transmission/transmission apparatus and method in a communication system are provided, in which a BS groups MSs serviced by the BS into MS groups and allocates a DL dedicated channel and a UL dedicated channel to each of the MS groups.

Abstract: An optical amplification apparatus includes a polarizing beam splitter for reflecting a portion of an incident light and transmitting a remaining portion of the incident light, depending upon a polarized state of the incident light, at least two optical amplification means each including a first polarizing plate which makes polarized states of the light before and after the light reflected from the polarizing beam splitter reciprocatingly passes through the first polarizing plate, to be orthogonal to each other, an amplitude division plate for amplitude-dividing the light having passed through the first polarizing plate, into first and second lights, and optical amplifiers for respectively amplifying the first and second lights which are amplitude-divided by the amplitude division plate. The optical amplification means are located such that the light output from upstream optical amplification means is incident upon the polarizing beam splitter included in downstream optical amplification means.

Abstract: Provided is an apparatus and method for transmitting/receiving signals in a communication system. A base station allocates a quasi-dedicated control channel (QDCCH) to a first mobile station (MS), and allocates the QDCCH allocated to the first MS, to a second MS for a preset time. An MS receives a QDCCH allocated from the base station. If there is data to transmit to the base station, the MS determines whether the QDCCH is allocated to another MS different from the MS. If it is determined that the QDCCH is allocated to the MS itself, the MS transmits the data to the base station over the QDCCH.

Abstract: A method for generating a parity check matrix of a Low Density Parity Check (LDPC) code. A base matrix is generated in which elements with a value of 1 are arranged at predefined distances. The elements with the value of 1 in the base matrix are replaced with predefined sub-matrices. The method can improve the performance of the LDPC code by implementing the parity check matrix in which the number of 4-cycles or 6-cycles adversely affecting the LDPC code performance is minimized.

Abstract: An apparatus and method for self-calibrating mismatching orthogonal signals and non-linearity of a circuit occurring in a mobile transceiver. For this, in a mobile terminal, a transmitter is used as a signal generator and a receiver is used as a response characteristic measurer. A base band processor calibrates mismatching signals and non-linearity in a reception side and a transmission side, based on a test signal received via the transmitter and a test signal received via the receiver.

Abstract: A transmission method based on random beamforming. A base station receives, from mobile stations, feedback information including channel-by-channel transmission rates for a weight vector arbitrarily set by the base station. The base station compares transmission rates of identical channels received from the mobile stations. The base station allocates an associated channel to a mobile station with a large transmission rate and transmits a signal through the allocated channel. The transmission method based on random beamforming can improve fairness and efficiency of a resource allocation by simultaneously allocating different channels to multiple terminals and can increase a total system capacity through the improved fairness and efficiency.

Abstract: An artificial joint apparatus used as an artificial joint inserted into a bone is provided. The artificial joint apparatus includes: a body having a stem having a shape substantially corresponding to a space within the bone, into which the stem is inserted, and a head formed integrally with the stem; and a jacket made of a plastic material and surrounding an outer surface of the stem of the body. The jacket is constructed with an outer layer containing a bone-friendly material and an inner layer mainly made of a plastic material. Since the plastic jacket of an artificial joint apparatus has a bone-friendly material, it is possible to promote a growth of a bone contacted thereto. In addition, the bone is grown into a space where the bone-friendly material is dissolved, so that the jacket and the bone can be securely adhered. Since the bone-friendly material also exists in an inner portion of the jacket it is possible to continuously accelerate a bone in-growth.

Abstract: An apparatus and method for compensating for the frequency offset of a received signal in a receiving apparatus of a mobile communication system. In the present invention, a sine component is calculated by adding I and Q channel signals resulting from downconverting a training sequence inserted between data symbols, and a cosine component is calculated by subtracting the Q channel signal from the I channel signal. Using the cosine and sine components at two time points, tangent components for the two time points are computed and thus first and second phase values are obtained. The frequency offset is estimated by determining the slope of a second-order line derived from the first and second phase values. The frequency offset of the received signal is compensated for based on the estimated frequency offset.