Patent application number | Description | Published |
20140119465 | INTERFERENCE ALIGNMENT METHOD AND APPARATUS IN WIRELESS COMMUNICATION SYSTEM - A method for supporting Interference Alignment (IA) in a wireless communication system includes multiplying a plurality of input symbols by precoding vectors for Interference Alignment (IA) to generate a plurality of signal vectors, mapping the signal vectors to subcarriers having unequal spacings to perform Inverse Fast Fourier Transform (IFFT), in which each signal element of the signal vector is mapped to two subcarriers among the subcarriers, converting the IFFT-transformed signal into a wireless signal and transmitting the wireless signal from a first transmitter to a receiver, and transmitting, to the receiver, information regarding precoding vectors used in the first transmitter and in second and third transmitters that communicate using the same frequency resource as the first transmitter for the IA. | 05-01-2014 |
20140334566 | APPARATUS AND METHOD FOR SELECTING TRANSMIT AND RECEIVE BEAM IN A WIRELESS COMMUNICATION SYSTEM - A method for operating a receiving end in a wireless communication system includes receiving subset information on analog beams of a transmitting end, from a transmitting end, and determining a combination of transmit beams to be used for data signal transmission to the receiving end, on the basis of the subset information, wherein the subset information indicates at least one subset into which the analog beams are classified, and each analog beam of the at least one subset has a correlation equal to or less than a threshold, with one another. An apparatus for a receiving end includes a communication unit configured to receive subset information on analog beams of a transmitting end, from the transmitting end, and a controller configured to determine a combination of transmit beams to be used for data signal transmission to the receiving end, on the basis of the subset information. | 11-13-2014 |
20140355707 | PRECODER SELECTION METHOD AND APPARATUS FOR PERFORMING HYBRID BEAMFORMING IN WIRELESS COMMUNICATION SYSTEM - One or more embodiments provides a precoder selection method for performing hybrid beamforming in a wireless communication system. The method includes selecting a predetermined number of candidate transmit beams using a signal strength received through each of first combinations with receive beams that can be mapped to each transmit beam of each of transmit antennas mounted on a transmitter. The method also includes selecting a precoder using signal strength received through each of second combinations with receive beams that can be mapped to each of the candidate transmit beams. | 12-04-2014 |
Patent application number | Description | Published |
20090118393 | Method of preparing thermoplastic resin having superior gloss, impact strength and whiteness - Disclosed is a method for preparing a thermoplastic resin with superior impact resistance, chemical resistance and processability as well as excellent gloss and whiteness. The method includes emulsion-polymerizing a conjugated diene compound monomer to prepare a rubber latex having an average particle diameter of 1,800 Å to 5,000 Å, a polymerization conversion ratio of at least 90% and a swelling index of 12 to 40, an average gel content of 70 to 95%, emulsion-polymerizing 45 to 75 parts by weight of the rubber latex with 17 to 40 parts by weight of an aromatic vinyl compound and 4 to 20 parts by weight of a vinyl cyanide compound to prepare a graft copolymer latex, and coagulating the graft copolymer latex with a coagulant at 60 to 80° C., and aging the graft copolymer latex at 80 to 99° C. to obtain a graft copolymer powder. | 05-07-2009 |
20100063199 | GRAFT COPOLYMER FOR TRANSPARENT THERMOPLASTIC POLYURETHANE RESIN, PREPARATION METHOD THEREOF, AND POLYURETHANE RESIN COMPOSITION CONTAINING THE SAME - The present invention relates to a graft copolymer for transparent thermoplastic polyurethane resin, a preparing method thereof and a polyurethane resin composition comprising the same, more precisely a graft copolymer for transparent thermoplastic polyurethane resin prepared by graft copolymerization of (a) 50-85 weight % of rubber latex having multi-layered structure composed of an inner layer and an outer layer comprising a conjugated diene monomer and an ethylenically unsaturated aromatic compound in which the refraction index of the inner layer is greater than that of the outer layer; and (b) 15-50 weight % of a C | 03-11-2010 |
20110097561 | Optical Film and a Production Method Therefor - The present invention provides an optical film and s retardation film characterized in that each of them includes: an acrylic resin; and 20-65 parts by weight of at least two graft copolymers containing a conjugated diene-based rubber, based on 100 parts by weight of the acrylic resin, wherein at least two of the graft copolymers have different particle sizes. The present invention also provides a production method therefore. | 04-28-2011 |
20110244240 | GRAFT COPOLYMER IMPROVING ADHESION RESISTANCE AND IMPACT STRENGTH, METHOD OF PREPARING THE SAME, AND PVC COMPOSITION COMPRISING THE SAME - Disclosed is a graft copolymer highly improving the adhesion resistance and impact strength, a method of preparing the same, and PVC composition containing the same, wherein the graft copolymer comprises i) 55 to 85 wt % of a conjugated diene-based rubber core; and ii) 15 to 45 wt % of a graft shell surrounding the rubber core, and formed by comprising a (meth)acrylate-based monomer, and at least one selected from the group consisting of a vinyl-based monomer having a polyalkylene oxide group represented by the following Formula 1; in which the graft copolymer includes 0.1 to 5 wt % of the vinyl-based monomer having the polyalkylene oxide group represented by the following Formula 1: | 10-06-2011 |
20110282108 | APPARATUS FOR PRODUCING ALCOHOLS FROM OLEFINS - The present invention relates to an apparatus for producing alcohols from olefins, comprising: a hydroformylation reactor wherein aldehydes are produced from olefins; a catalyst/aldehydes separator; a hydrogenation reactor wherein the aldehydes are hydrogenated to produce alcohols; and a distillation column. The hydroformylation reactor is equipped with a distributor plate, which has a broad contact surface for providing sufficient reaction area for reactants such as olefins and synthesis gas, and allows the reaction mixture to circulate and mix sufficiently, which contribute to excellent efficiency in terms of production of aldehydes. In addition, the hydrogenation reactor suppresses sub-reactions to improve the production yield of alcohols. | 11-17-2011 |
20140051893 | APPARATUS FOR PRODUCING ALCOHOLS FROM OLEFINS - The present invention relates to an apparatus for producing alcohols from olefins, comprising: a hydroformylation reactor wherein aldehydes are produced from olefins; a catalyst/aldehydes separator; a hydrogenation reactor wherein the aldehydes are hydrogenated to produce alcohols; and a distillation column. The hydroformylation reactor is equipped with a distributor plate, which has a broad contact surface for providing sufficient reaction area for reactants such as olefins and synthesis gas, and allows the reaction mixture to circulate and mix sufficiently, which contribute to excellent efficiency in terms of production of aldehydes. In addition, the hydrogenation reactor suppresses sub-reactions to improve the production yield of alcohols. | 02-20-2014 |
20140080976 | METHOD OF PREPARING RUBBER LATEX HAVING HIGH POLYMERIZATION STABILITY - Disclosed is a method for preparing a rubber latex which includes adding a basic solution to an initial reaction hydrophilic monomer and a small amount of fat-soluble monomer when a polymerization conversion ratio is 90% or more to form particles having a small diameter and superior stability, ionizing an end of the particles to secure stability of the particles and growing the formed particles, and thereby obtains a stable latex with a large particle diameter using a minimal amount of emulsifying agent and minimizes gas generation and heat discoloration derived from the emulsifying agent. | 03-20-2014 |