摘要:
Apparatuses and methods for transmission and reception in a Closed-Loop (CL)-Multiple Input Multiple Output (MIMO) system are provided. A codebook generation method includes determining weight vectors vi(i=1, . . . ,2L) for a codebook V(4, 1, L), where Nt of a codebook V(Nt,s,L) denotes a number of antennas, s denotes a number of streams, and L denotes a number of codebook index bits, determining a unitary matrix Ti using an i-th vector vi of the codebook V(4, 1, L), and determining an i-th matrix of the codebook V(4, 2, L) by selecting a first column of the unitary matrix Ti as a first column of a weight matrix and selecting a column selected from other columns excluding the first column of the unitary matrix Ti in a particular pattern, as a second column of the weight matrix.
摘要:
An apparatus and method for channel information feedback in a multiple antenna system are provided. The method includes selecting at least one code for at least one Eigen vector based on channel information with a serving node from a codebook including at least one code, constructing a set of codes orthogonal to a first code including the at least one selected code, and indicating the first code using an amount of information that enables expression of the codes of the codebook, indicating codes, other than the first code, in the constructed set using an amount of information that enables expression of the codes included in the set and performing feedback to the serving node.
摘要:
A system and method for transmitting/receiving a signal in a communication system are provided, in which a transmitter determines to change a transmission time of a superframe header, when a structure of a superframe is changed, determines the transmission time of the superframe header according to a result of the determination to change the transmission time of the superframe header, transmits information about the determined transmission time to a receiver, and transmits the superframe header at the determined transmission time.
摘要:
An apparatus and method for reducing the volume of a resource allocation information message in a broadband wireless communication system are provided, in which a scheduler determines whether to generate uplink control region allocation information, and a generator generates the uplink control region allocation information according to a result of the determination.
摘要:
An apparatus for controlling a gain of transmit antennas in a communication system. The transmit antenna gain control apparatus includes a controller for determining a gain of multiple transmit antennas on a basis of a transmit antenna having a minimum currently unused residual power among currently unused residual powers of the multiple transmit antennas used in the communication system.
摘要:
An apparatus and method for setting transmit power of a compact Base Station (BS) in a wireless communication system are provided. In the apparatus and method a measurer measures a signal strength corresponding to each of one or more neighbor BSs while operating in a Mobile Station (MS) mode, a receiver receives a signal strength corresponding to each of the one or more neighbor BSs measured by one or more MSs from the corresponding one or more MSs, and a self-configuration controller sets a target signal strength based on the signal strength corresponding to each of the one or more neighbor BSs measured in the MS mode and controls a transmit power so that the signal strength corresponding to each of the one or more neighbor BSs measured by the one or more MSs substantially reaches the target signal strength.
摘要:
Provided are a single-sided one-sheet type capacitive touch screen and a method for manufacturing the same. The touch screen includes: a substrate; a first conductive pattern disposed on the substrate in a vertical direction and including at least two pattern columns having two or more conductive pattern regions electrically connected with each other; a second conductive pattern disposed on the same surface of the substrate as the surface where the first conductive pattern is disposed, not being electrically connected with the first conductive pattern, and including two or more conductive pattern regions not electrically connected with each other; a transparent conductive bridge electrically connecting the conductive pattern regions of the second conductive pattern in a horizontal direction; and a transparent insulating part disposed between the transparent conductive bridge and the first conductive pattern to electrically insulate the transparent conductive bridge and the first conductive pattern.
摘要:
An apparatus and method for dynamic frequency assignment to a low-power Base Station (BS) in a wireless communication system are provided. The method includes receiving a Received Signal Strength Indication (RSSI) measurement result for the whole Frequency Assignment (FA) and an available FA set of the BS from the BS newly entering a network, selecting an FA having a minimum RSSI among FAs included in the available FA set, and assigning the FA having the minimum RSSI to the BS.
摘要:
An apparatus and method for transmitting in a multi-user multi-antenna system are provided. The apparatus includes a precoder for orthogonalizing a channel by removing a channel element of a corresponding terminal with respect to multiple terminals, for determining an effective channel of each terminal by decomposing the orthogonalized channel using Singular Value Decomposition (SVD), for determining a precoding matrix using the effective channel, and for mapping data streams of the multiple terminals to a plurality of transmit antennas using the precoding matrix, and the plurality of the transmit antennas for transmitting the data streams of the multiple terminals. Hence, it is possible to obtain an iteration algorithm performance requiring considerable computation while avoiding complexity and reducing computation.
摘要:
The present disclosure relates to a wafer burn-in system having a device cooling a probe card and thereby restraining heat accumulation in the probe card. The disclosed wafer burn-in system includes a probe station and a tester. The probe station includes a burn-in chamber, a probe head, and a wafer stage. The probe head has a probe card installed on the lower surface of the probe head. A cooling device restrains heat accumulation in the probe card, e.g., by generating airflow around the probe card. The wafer stage of the burn-in chamber fixes a wafer loaded on the upper surface of the wafer stage and elevates the wafer for contact with the probe card. The tester connects to the probe station through a general purpose interface bus (GPIB) to convey test signals to and from the probe head, and to control operation of the cooling device. The tester activates the cooling device, e.g., activates air blowers to generate airflow forcibly around the probe card and thereby restrain heat accumulation in the probe card during a burn-in process performed in the burn-in chamber.