摘要:
A phase calculation apparatus using a binary search is provided. The phase calculation apparatus includes a quarter surface preprocessor determining the bigger one between an absolute value of I component data and an absolute value of Q component data as horizontal component data and the smaller one as perpendicular component data, and detecting information on a phase region indicating an mth (m=1 to 8) phase region (the mth phase region is between (m−1) π/4 and m π/4 in which the I/Q component data are located; a phase representative value detector detecting phase representative values x corresponding to the horizontal component data and the perpendicular component data; and a quarter surface postprocessor calculating phase values of the I/Q component data based on the detected information about the phase region and the detected phase representative values x. The phase can be calculated using a limited memory, low complexity of calculation and regardless of the number of bits of I/Q component data.
摘要:
An interleaving apparatus and method for an OFDM transmitter are provided. The interleaving apparatus comprises a memory unit, a memory write/read control unit, a memory access address generation unit, and a second permutation and output selection unit. The memory unit includes a plurality of memory banks, which are capable of being independently controlled so that data can be written or read in/from the memory banks, each having memory cells arranged in an NxM matrix structure. The memory write/read control unit generates control signals to write/read data in/from the memory unit. The memory access address generation unit generates a memory access address used to write/read data in/from the memory unit in response to the memory write/read control signals. The second permutation and output selection unit rearranges the positions of data bits output from the memory unit and outputs the position-rearranged data bits.
摘要:
According to one embodiment of the present invention, a cast alloy material is provided. The cast alloy material includes a matrix metal and an alloy element, wherein oxide particles in a nanometer scale are decomposed in the matrix metal, so that a new phase including a metal element that is a component of the oxide particles and the alloy element forms a band or network structure, wherein the metal element and the alloy element have a relationship of a negative heat of mixing, and wherein oxygen atoms formed by decomposition of the oxide particles are dispersed in the matrix metal and do not form an oxide with the matrix metal.
摘要:
A received ATM layer OAM cell processing apparatus for processing in real time a fault management cell among ATM layer OAM cells of F4/F5 levels applied to a user network interface and a network node interface and performing CRC-10 and CRC-32 operations with respect to the other ATM layer OAM cells such as activation/deactivation cells, a resource management cell, a system management cell and a meta signaling cell, not processed in real time. Further, the received ATM layer OAM cell processing apparatus processes in real time a performance management cell among the ATM layer OAM cells of F4/F5 levels applied to the user network interface and network node interface. Therefore, the received ATM layer OAM cell processing apparatus can accumulate in real time performance information such as the total number of received performance management cell blocks, the number of received error cell blocks, the number of received excessive errored cell blocks, the number of lost cells, the number of misinserted cells, the number of discarded cells, the number of tagged cells and the total number of received cells with respect to a specified ATM virtual connection, thereby measuring the service quality and network parameter.
摘要:
Disclosed is a method of manufacturing a metal matrix composite in which oxide nanoparticles are dispersed. Metal matrix composite powders in which oxide nanoparticles are dispersed are prepared. Gibbs free energy of the oxide nanoparticles is greater than that of an oxide of a metal matrix. A bulk processed material is manufactured from the composite powders through hot forming or a cast material is manufactured by inputting the composite powder into a molten base metal and then rapidly stirring a resultant mixture. The bulk processed material or the cast material is heat-treated so that atoms of the metal matrix and atoms of the oxide nanoparticles mutually diffuse. Oxygen atoms originating from the oxide nanoparticles are diffused and dispersed in the metal matrix.
摘要:
The present invention relates an automatic gain control device, which performs a high-speed gain control operation in high-speed data communication using burst signals, generates a gain code without using a memory or storage device to simplify a system configuration, and establishes a correct gain control operation. The automatic gain control apparatus includes a power detector for calculating a mean power of the output signal of the variable gain amplifier; a gain code generator for receiving a mean power from the power detector, and generating a gain code corresponding to the received mean power; and a voltage generator for calculating a difference between the gain code and a target gain code associated with the output signal of the variable gain amplifier to detect an error code, and generating a gain control voltage for compensating for the difference between the two gain codes on the basis of the detected error code.
摘要:
An adaptive clock recovery apparatus. The adaptive clock recovery apparatus comprises a clock switching unit for switching a sample clock to be input from outside according to an adaptive clock controlling signal; a sample counting unit for inputting both a reset signal from the outside and an output from the clock switching unit, and outputting sample data by an operation depending upon a buffer state signal; an adaptive clock controlling unit for inputting the sample clock, the buffer state signal, the reset signal, and the sample data from the sample counting unit, and outputting the adaptive clock controlling signal to the clock switching unit; a reception frequency processing unit for inputting reception frequency from outside, and outputting frequency set up data; an adaptive clock generating unit for inputting both the frequency set up data from the reception frequency processing unit and the adaptive clock controlling signal from the adaptive clock controlling unit, and outputting the adaptive clock to the outside; and a buffering unit for outputting image data input from outside to the outside according to the adaptive clock of the adaptive clock generating unit, and also outputting the buffer state signal to the adaptive clock controlling unit and the sample counting unit, respectively.
摘要:
According to one embodiment of the present invention, a cast alloy material is provided. The cast alloy material includes a matrix metal and an alloy element, wherein oxide particles in a nanometer scale are decomposed in the matrix metal, so that a new phase including a metal element that is a component of the oxide particles and the alloy element forms a band or network structure, wherein the metal element and the alloy element have a relationship of a negative heat of mixing, and wherein oxygen atoms formed by decomposition of the oxide particles are dispersed in the matrix metal and do not form an oxide with the matrix metal.
摘要:
An apparatus for deciding a shift pattern suitable for a driver's habit using a neural network operation and fuzzy inference and a control method thereof which perform a neural network operation by inputting a driver's driving operation quantity as a deciding condition of a shift pattern, and decide an optimal shift pattern by performing fuzzy inference from the output from the a neural network operation.
摘要:
A fault tolerant network using a dual cross path for real-time switching and packet handling method are disclosed. In DRDT-II, one of two packets received from two input ports is selected, the other is discarded, and two duplicated packets are transmitted through two output ports. That is, one link bypasses one node. In DRDT-III, the other link bypasses two nodes. Even when fault occurs in neighboring nodes at the same time, only these nodes are abandoned, and remaining nodes can be communicated with one another, improving the reliability of the network.