摘要:
here is provided a new multi-user receiver configuration technique which solves the problems of the user signal separation function of the multi-user receiver such as the interference canceller, decorrelator, and least square error detection. That is, there is provided a code-division multiplex signal decorrelation/identification method for realizing much more excellent performance than the aforementioned methods in the aspect of the power band amplitude product required for one-bit transfer as the evaluation reference of the CDMA method. A function for successively judging the best user is added to the conventional least square error detector MMSE-D shown by a dotted line in the block diagram of the successive detection type least square error detection method (SD-MMSE).
摘要:
A de-correlating discriminating system of code division multiple access signals including a system structure composed of a plurality of cells, each of the plurality of cells including a base-station and a plurality of user-stations, each of the user-stations including a user-transmitter and a user-receiver, communicating through a multi-access channel with the base station which includes a base-station receiver and a base-station transmitter, and the user-transmitter is capable of transmitting a data symbol to convey a data with a spreading sequence and a pilot symbol that is the spreading sequence to identify a channel from the user transmitter to the base-station receiver and the base-station receiver includes a minimum means square error detector to analyze an input vector that is a received signal containing both multiple users specific data responses.
摘要:
This invention provides techniques for a CDMA system having high spectrum efficiency with low transmit power. Each transmitter comprises means of selecting some core-sequences out of multiple sequences to make them convey plural data, means of producing an enveloped selected sequence with such a method as to arrange as guard sequences to a repeated sequence made by repeating each of the selected core-sequences, means of modulating a user specific orthogonal carrier frequency by the enveloped selected sequence to produce a transmit-symbol, and means of transmitting the transmit-symbols. And a receiver comprises means of demodulating a receive-symbol with one of the user specific carrier frequencies to produce a base-band receive-symbol, means of separating respective components corresponding to the sequences selected by the user, by analyzing the base-band receive-symbol with a matrix composed of a channel response vector from the user to the receiver to detect plural data on the components.
摘要:
The present invention relates to a production method for a product having a cured resin layer with a fine concave-convex structure formed on the surface of a substrate, the method including filling the space between a mold having a fine concave-convex structure composed of anodized alumina on the surface and a substrate with an active energy ray-curable resin composition, and curing the composition by irradiation with active energy rays, thereby forming a cured resin layer into which the fine concave-convex structure has been transferred on the surface of the substrate, wherein (A) the method includes treating the surface of the mold with a release agent, at least at transfer initiation, and (B) the active energy ray-curable resin composition includes a polymerizable compound, a polymerization initiator and a (poly)oxyethylene alkyl phosphate ester compound.
摘要:
The present invention provides a method making it possible to stably prepare a transparent film in which a cured layer having a micro protrusion and recess face structure is formed on the surface of a base material film. The preparation method of the present invention includes a step of sandwiching an active energy beam-curable resin composition including a photopolymerization initiator which can initiate polymerization of a polymerizable compound by absorbing light between the surface of a base material film which is supported by a supporting film, and a mold which has an inverse structure of the micro protrusion and recess face structure on the surface; a step of obtaining the transparent film supported by the supporting film by means of irradiating the active energy beam-curable resin composition with ultraviolet rays from the supporting film side; and a step of separating the transparent film and the mold.
摘要:
An NC automatic lathe including abase board, a headstock provided with a main spindle and so arranged as to move in a direction of Z1 axis, a back attachment provided with a sub spindle which is so arranged as to be opposed to the headstock, the back attachment being so arranged as to move in directions of Z2 axis, X2 axis and Y2 axis, a guide bush, a first turret tool post arranged at a side of the guide bush so as to move in directions of X1 axis and Y1 axis, a second turret tool post arranged at a side of the guide bush so as to move in directions of Z3 axis, X3 axis and Y3 axis, and a fixed back machining tool unit arranged at a position offset with respect to at least one of the first turret tool post and second turret tool post, to the back attachment in a direction of Z axis, and provided with tool holding portions in at least two rows and two lines in directions of X axis and Y axis.
摘要:
A deployable reflector of the invention includes connection members that bridge plural extendable structures constituting a deployable truss structure and connect portions corresponding to nodes of a buckling mode occurring in the extendable structures when a surface cable system is given tension, with portions corresponding to antinodes thereof. The surface cable system includes an internal surface cable system and a circumferential surface cable system connected to the outer circumference thereof. A cable used for the internal surface cable system is high in stiffness and small in ratio of length variation to tension variation. A cable used for the circumferential surface cable system is lower in stiffness and smaller in ratio of the tension variation to the length variation than that used for the internal surface cable system. Given tension by the deployable truss structure via the circumferential surface cable system, the internal surface cable system forms predetermined surface shape.
摘要:
A deployable antenna which has a larger aperture diameter by four-side links provided in at least three stages and which includes: six deployment link mechanisms (20) arranged radially from a central shaft so as to support an outer edge portion of a flexible reflector mirror surface; and one deployment driving mechanism (30) arranged at a lower portion of a center of arrangement of the six deployment link mechanisms, for unfolding the six deployment link mechanisms. Each of the six deployment link mechanisms includes a first four-side link (5), a second four-side link (6), and a third four-side link (7) arranged in an order from a position of the central shaft, around which the six deployment link mechanisms are arranged, toward an outer side of the each of the six deployment link mechanisms so that the each of the six deployment link mechanisms is structured to be foldable in three stages.
摘要:
A machine tool includes: a main spindle adapted to be rotatable with a workpiece chucked thereby; a tool spindle capable of moving in directions of three axes perpendicular to each other and capable of pivoting about one of the axes, the axis being perpendicular to the main spindle; an automatic tool changer adapted to detachably attach a first tool and a chucking unit to the tool spindle, the first tool being used for machining the workpiece chucked by the main spindle, the chucking unit being used for chucking the workpiece; and a tool post having a second tool mounted thereon, the second tool being used for machining the workpiece chucked by the chucking unit attached to the tool spindle.
摘要:
According to one embodiment, a machine tool for machining a workpiece includes: a main spindle that holds the workpiece to rotate the workpiece around a axis; a tool that is configured to machine the workpiece by working together with the main spindle; a headstock that rotatably supports the main spindle and includes a leading-edge portion and a base-end portion; and a bed that supports the headstock by a sliding bearing at the leading-edge portion and rolling bearings at two points of the base-end portion so that the headstock is movable along an axial line of the main spindle, wherein the two points of the base-end portion are spaced apart from each other in a direction orthogonal to the axial line of the main spindle.