Abstract: The present invention relates to a method for setting a control multi point of a serving cell in a wireless communication system. The serving cell selects more than one adjacent base station as a control multi point set based on first link information between terminals and the adjacent base stations received from the terminals. Furthermore, the serving cell: receives a pre-coding matrix index corresponding to the adjacent base stations which is selected by the terminals, selects more than one pre-coding matrix index from the received pre-coding matrix indexes according to a preset condition, generates a pre-coding matrix index list, and transmits pre-coding matrix index list to the corresponding base station.

Abstract: A method for transmitting a reference signal in a multi-antenna system is provided. The method includes: selecting at least one orthogonal frequency division multiplexing (OFDM) symbol in a subframe containing a plurality of OFDM symbols; allocating a channel quality indication reference signal (CQI RS) capable of measuring a channel state for each of a plurality of antennas to the selected at least one OFDM symbol; and transmitting the CQI RS, wherein the CQI RS is allocated to an OFDM symbol which does not overlap with an OFDM symbol to which a common reference signal to be transmitted to all user equipments in a cell or a dedicated reference signal to be transmitted to a specific user equipment in the cell is allocated.

Abstract: A method and apparatus for transmitting a signal in a wireless communication system are provided. The method includes: generating R spatial streams each of which is generated on the basis of an information stream and a reference signal; generating N transmit streams on the basis of the R spatial streams and a precoding matrix (where R<N); mapping the N transmit streams to at least one resource block; and generating N signals from the N transmit streams mapped to the at least one resource block, and transmitting the N signals to a user equipment through respective antennas.

Abstract: The invention provides a method for chemical mechanical polishing of a substrate. The invention comprises providing a substrate, wherein the substrate comprises a chalcogenide phase change alloy and providing a chemical mechanical polishing composition, wherein the chemical mechanical polishing composition comprises, by weight percent, water, 0.1 to 30 abrasive, at least one polishing agent selected from 0.05 to 5 halogen compound, 0.05 to 5 phthalic acid, 0.05 to 5 phthalic anhydride and salts, derivatives and mixtures thereof and wherein the chemical mechanical polishing composition has a pH of 2 to less than 7. A chemical mechanical polishing pad polishes the substrate with the chemical mechanical polishing pad and the chemical mechanical polishing composition to selectively or non-selectively remove the chalcogenide phase change alloy from the substrate.

Abstract: The invention provides a chemical mechanical polishing composition for chemical mechanical polishing of a chalcogenide phase change alloy substrate. The composition comprises by weight percent, water, 0.1 to 30 colloidal silica abrasive, at least one polishing agent selected from 0.05 to 5 halogen compound, 0.05 to 5 phthalic acid, 0.05 to 5 phthalic anhydride and salts, derivatives and mixtures thereof. The chemical mechanical polishing composition has a pH of 2 to less than 7.

Abstract: A data transmission method in a multiple antenna system is provided. The method includes: defining a codebook including at least one precoding matrix composed of a plurality of rows and columns, wherein the codebook is at least one of a first type in which all elements of the precoding matrix are non-zero elements, a second type in which any one column of the precoding matrix includes non-zero element and the remaining columns include at least one zero element, and a third type in which all columns of the precoding matrix include at least one zero element; precoding an input symbol by using the defined codebook; and transmitting the precoded symbol.

Abstract: The present invention relates to a method and an apparatus for data communication through a Coordinated Multi-Point Transmission in a multiple cell environment. According to the present invention, the data communication method through a coordinated multi-point transmission in a multiple cell environment including a serving base station and a cooperative base station for performing a coordinated multi-point transmission comprises the steps of: receiving data from the serving base station and the cooperative base station through a downlink channel; and demodulating the received data. Each datum transmitted from the serving base station and the cooperative base station includes a predetermined Reference Signal and a data Resource Element, and a Transmit Diversity is applied to the data resource elements of both the serving base station and the cooperative base station through Pairing.

Abstract: A method of transmitting data in a wireless communication is disclosed, by which timing error can be solved in a multi-cell environment. The present invention, in which data is transmitted by a serving cell to a mobile station communicating with a plurality of cells in a wireless communication system, includes receiving information on delay times of signals from the mobile station, wherein the signals are received by the mobile station from the plurality of the cells and transmitting data to the mobile station by inserting a cyclic prefix (CP) having a length determined according to the information on the delay times into the data.

Abstract: A method of transmitting a signal of a mobile station that performs communication with a plurality of cells in a wireless communication system comprises transmitting a control signal or a data signal through an asynchronous channel to a neighboring cell which is not synchronized with the mobile station, the asynchronous channel including cyclic prefix and guard time.

Abstract: A method for generating a downlink signal in a downlink MIMO (Multiple Input Multiple Output) comprises the steps of: mapping at least one transport block to at least one codeword; mapping at least one layer to each codeword; classifying at least one layer mapped to each codeword into a certain number of layer groups and performing layer permutation by the layer groups; and generating an OFDM (Orthogonal Frequency-Division Multiplexing) symbol using a signal which is permutated by the layer groups. A CRC (Cyclic Redundancy Check) is attached by the layer groups.

Abstract: The present invention relates to a Multi-Input Multi-Output (MIMO) communication system and more particularly, to a method for Correlation matrix feedback in a multi-cell wireless communication system. A method for transmitting correlation matrix feedback information of a mobile station considering adaptive feedback mode in a multi-cell wireless communication system according to one embodiment of the present invention comprises measuring a channel between the mobile station and a serving base station using a signal received from the serving base station; determining a first matrix indicating channel state information and a first precoder using the measured channel; generating a second matrix using a Fourier matrix and the first matrix; and transmitting feedback information including at least one of information of the first precoder and diagonal values of the second matrix.

Abstract: The present system relates to a method for transmitting control information in a wireless communications system that supports coordinated multi-point (CoMP) including N (N>1) transmission points. The method comprises: generating control information for downlink transmission of the N transmission points; and transmitting the generated control information to a user device, wherein the control information contains a control information region for transmission of intrinsic control information on a reference transmission point among the N transmission points, and N?1 control information regions for transmission of intrinsic control information on the N?1 transmission points.

Abstract: A method of receiving a signal at a user equipment (UE) from at least two cells in wireless communication system is disclosed. Receiving module may receive data and at least one reference signal from a CoMP (Coordinated Multi-Point) set including at least two cells. Decoding module may decode the received data and the received at least one reference signal. In this case, a power level of the data is same as a power level of the at least one reference signal, or a power ratio between the data and the at least one reference signal is a scaled value. Also, the power level of the data and the at least one reference signal are same for each of the at least two cells. A power ratio between the data and the at least one reference signal is a same scaled value for each of the at least two cells.

Abstract: A method of transmitting and receiving channel state information feedback in a wireless communication system is disclosed. A method of transmitting channel state information (CSI) feedback by a user equipment receiver in a wireless communication system comprises mapping components of a CSI matrix to constellations; and allocating the mapped components to resource.

Abstract: The present invention provides a method which determines an adjacent cell to carry out a coordinate multipoint transmission (CoMP) operation instead of performing the CoMP operation for all adjacent cells, in cases where precoding matrix indexes (PMI) of adjacent cells are limited to prevent interferences by adjacent cells in a multi-cell environment, thereby effectively reducing inter-cell interferences without causing an overhead.

Abstract: A method of coordinating precoding matrixes in a wireless communication system is disclosed. A method of coordinating precoding matrixes by a base station in a wireless communication system comprises receiving precoding matrix index information from neighbor cells; and generating PMI allocation for each resource according to the precoding matrix index information wherein at least one PMI is restricted or recommended in part of resource in the PMI allocation for each resource.

Abstract: An apparatus and method for transmitting signals in a wireless communication system are provided. The apparatus includes N antennas, a processor coupled to the N antennas and configured to generate N transmit signals by performing precoding on R spatial streams for R spatial layers, and to transmit the N transmit signals respectively through the N antennas, wherein an information stream, a reference signal sequence, and a reference signal pattern are allocated to each of the R spatial layers, and the reference signal pattern is a time-frequency resource pattern used for transmission of the reference signal sequence, wherein each of the R spatial streams corresponds to one spatial layer, and wherein each of the R spatial streams is generated based on the information stream, reference signal sequence, and reference signal pattern allocated to a corresponding spatial layer.

Abstract: The present invention relates to a method for synchronizing multiple cells, which perform cooperative multi-input multi-output operations, as well as to a method for inter-cell synchronization in a multi-cell environment, comprising the steps of: measuring a propagation delay of a cooperative base station; transmitting the measured propagation delay to a serving base station; and receiving data for cooperative multi-input multi-output operations in which a transmission location is adjusted, on the basis of the propagation delay of the cooperative base station, when the serving base station transmits the propagation delay to the cooperative base station.

Abstract: A method of optimizing a CoMP Zone for a joint processing mode is disclosed. A method of optimizing a CoMP zone for a joint processing mode in a user equipment of a mobile communication system comprises transmitting information of at least one subband preferred by the user equipment among a plurality of subbands included in the CoMP zone, to a serving base station; receiving information of a specific subband included in the CoMP zone from the serving base station; and receiving data from at least one of the serving base station and neighboring base stations that support the CoMP, through a radio resource corresponding to the specific subband.

Abstract: The present invention provides a data transmission device and method in a wireless communication system. The device comprises a processor which is connected with the M antennas and which is formed so as to generate data to be transmitted through the M antennas, on the basis of a precoding matrix; the precoding matrix is generated based on a plurality of matrices; and a first matrix, which is one matrix among the plurality of matrices, is selected from within a codebook for N antennas (where N<M).