Abstract:
PURPOSE: A satellite ATM(Asynchronous Transfer Mode) interface device for transmitting Internet and video data to a satellite network and a method therefor are provided to multiplex ATM data, the Internet data, and the video data of a terrestrial network, which have inter-different traffic characteristics, and transmit the multiplexed data to a satellite. CONSTITUTION: A line interface unit(100) synchronizes a received frame or packet, and transmits a generated corresponding frame or packet to an ATM network, an Internet network, and a transmission network. A cell/frame processing unit(200) receives the frame or packet transmitted from the line interface unit(100), and generates an ATM cell or processes a valid cell and generates a new frame. A FIFO processing unit(300) receives and stores the ATM cell generated from the cell/frame processing unit(200), and grasps states of one or more FIFOs. A multiplexing/demultiplexing process unit(400) receives state grasp result values of the FIFOs from the FIFO processing unit(300), multiplexes the ATM cells according to the characteristic of a traffic, and transmits the multiplexed ATM cell. The multiplexing/demultiplexing process unit(400) demultiplexes a cell received from the outside, and transmits the demultiplexed cells to the FIFO processing unit(300).
Abstract:
PURPOSE: A DFT device and a method thereof are provided to minimize use of hardware in DFT by perforing DFT of an uplink signal which combines a CAZAC sequence generation formula with an DFT formula. CONSTITUTION: An index table(110) stores an index value. A lookup table(120) stores a factor used for DFT(Discrete Fourier Transformation). A DFT unit(130) searches for the factor in an index table address from the lockup table. The DFT unit performs the DFT of an uplink signal by appling an equation of an exponential function mode which combines a CAZAC(Constant Amplitude Zero Auto-Correlation) sequence generation formula with an DFT formula.
Abstract:
PURPOSE: An interleaving apparatus for increasing transmission efficiency and an interleaving method thereof are provided to eliminate a memory from the interleaving apparatus, thereby preventing signal processing time delay. CONSTITUTION: A determination unit(210) determines a data type of each element location of a matrix for interleaving. An interleaving processing unit(220) rearranges the order determined in a matrix for interleaving encoding data. The encoding data corresponds to the data type of each element location. The determination unit comprises an antenna related data determining unit(211) and a response data determining unit(212). The determination unit comprises a skip value calculating unit(213), a channel quality data memory reading address calculating unit(214), and a transmission data memory reading address calculating unit(215).
Abstract:
PURPOSE: A device for gold code generation capable of delaying sequence and operating at a high speed is provided to generate a PN sequence based on initial value including time delay information or masking schema and a plurality of PN sequences at the same time, thereby generating a gold code without waste of hardware clock. CONSTITUTION: A first sequence generator(220) generates the first PN (Pseudo-Random Noise) sequence based on the first initial value including the selected time delay information. A second sequence generating unit(230) generates the second PN sequence based on the second initial value and masking information including the selected time delay information. A code generator(240) generates a gold code using the first PN sequence and the second sequence.
Abstract:
본 발명은 광통신 모듈의 신뢰성 시험장치에 관한 것으로, 특히 광전 변환 모듈과 암전류 측정장비 사이의 인터페이스 장치에 관한 것이다. 상기 기술적 과제는 본 발명에 따라 상기 암전류 측정장비로부터 바이어스 전압을 인가받는 인터페이스부; 상기 인터페이스부를 통해 인가되는 바이어스 전압을 각각 연계되는 광전 변환 모듈로 일괄 제공하는 다수의 채널부들; 및 상기 다수의 채널부들 중 하나를 순차적으로 선택하여 선택된 채널부에 연계되는 광전 변환 모듈에 흐르는 암전류를 상기 인터페이스부를 통해 출력하는 제어부를 포함하는 것을 특징으로 하는 인터페이스 장치에 의해 달성되며, 이에 따라 측정 효율성을 향상시키고 광전 변환 모듈의 생산 단가의 상승 요인을 최소화할 수 있는 효과가 있다. 광통신, 포토 다이오드, 암전류, 신뢰성 시험
Abstract:
PURPOSE: A satellite ATM interworking apparatus and an implementing method thereof are provided to simultaneously transmit video and Internet-related signals by a satellite as well as an ATM signal of a terrestrial network according to interworking between a satellite and the terrestrial network. CONSTITUTION: The first ATM constituting unit connected to the first terrestrial ATM network outputs ATM cell data. The second ATM constituting unit connected to the second terrestrial ATM network outputs ATM cell data. An MPEG constituting unit generates video signals of a transport stream according to MPEG(Moving Picture Experts Group)-2 standards as ATM cell data. An IPoA constituting unit generates ethernet frame data as ATM cell data and outputs it. A link enhancing unit adaptively corrects an error according to a state of a phase channel. An ATM layer processor multiplexes generated ATM cell data and outputs it to the link enhancing unit.