Abstract:
본 발명에 따른 주파수 분할 다중 접속을 위한 송신기는 심볼 매퍼, 상기 심볼 매퍼로부터 심볼 매핑된 심볼들에 대하여 DFT 확산을 수행하는 제 1 DFT와 제 2 DFT, 상기 제 1 DFT와 상기 제 2 DFT에서 DFT 확산된 심볼들을 서브 캐리어 매핑하는 서브캐리어 매퍼를 포함하고, 전송되는 RB(Resource Block)들의 전체 크기가 상기 제 1 DFT에서 처리 가능한 경우, 상기 제 1 DFT에서 처리를 수행하고, 상기 RB들의 전체 크기가 상기 제 1 DFT에서 처리 불가능한 경우 상기 RB들 중 상기 제 1 DFT에서 처리 가능한 크기의 RB들은 상기 제 1 DFT에서 처리하며, 상기 제 1 DFT에서 처리하지 않는 나머지 RB들은 상기 제 2 DFT에서 처리하는 것을 특징으로 한다. 따라서, 할당하는 주파수 자원 크기의 제약 사항을 극복하여 스케줄링의 복잡도를 낮추면서도, PAPR의 증가를 억제하여 단말의 전력 소모를 줄이는 효과를 얻을 수 있다.
Abstract:
PURPOSE: A wireless connection method of a narrowband terminal and an apparatus using the same are provided to allow a base station to efficiently utilize a wireless resource by notifying the base station about the dedicated bandwidth of the narrowband terminal. CONSTITUTION: A receiver (100) receives system information or a handover command from a base station. A transmitter (200) transmits a random access preamble to the base station. The receiver receives a random access response message from the base station. The transmitter transmits a connection request message including information about the dedicated bandwidth of a narrowband terminal or a handover confirmation message. The transmitter allocates a frequency band corresponding to the dedicated bandwidth of the narrowband terminal. [Reference numerals] (100) Receiver; (200) Transmitter; (300) Controller
Abstract:
본 발명은 에이티엠(ATM) 링크 개선과 지상망 연동을 위한 위성 에이티엠 연동 장치 및 그 구현 방법에 관한 것이다. 이를 위해 본 발명에서는, 위성으로 에이티엠(ATM) 신호를 전송하는 위성 에이티엠 연동 장치에 있어서, 제1 지상 에이티엠(ATM) 망과 연결되어 에이티엠(ATM) 셀 데이터를 출력하는 제1 에이티엠 구성부, 제2 지상 에이티엠(ATM) 망과 연결되어 에이티엠(ATM) 셀 데이터를 출력하는 제2 에이티엠 구성부, MPEG(Moving Picture Experts Group)-2 표준안에 따른 트랜스포트 스트림의 비디오 신호를 에이티엠(ATM) 셀 데이터로 생성하는 MPEG 구성부, 이더넷 프레임(ETHERNET FRAME) 데이터를 에이티엠(ATM) 셀 데이터로 생성하여 출력하는 IPoA 구성부, 위성 채널에서 버스트 에러(BURST ERROR)가 발생하면, 발생된 버스트 에러를 랜덤 에러(RANDOM ERROR) 형태로 분산시켜 위상 채널의 상태에 따라 적응적으로 에러를 정정하는 링크 개선부 및, 생성된 에이티엠(ATM) 셀 데이터를 다중화 하여 링크 � ��선부로 출력하는 에이티엠 계층 프로세서를 포함하는 것을 특징으로 한다. 이를 통하여, 위성 에이티엠 링크를 개선하여 신뢰성 있는 품질의 서비스를 제공할 수 있다.
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 random access method of a wireless communication system and an apparatus using the same are provided to allow a terminal to determine the timing for transmitting a random access preamble through a component carrier. CONSTITUTION: A transmission unit (110) transmits a random access preamble (RAP) through at least one primary component carrier (SCC) in preamble transmission timing. The preamble transmission timing corresponds to the timing advance value of a primary component carrier (PCC). A reception unit (120) receives information about the timing advance of at least one SCC. The information is a response to the transmission of the RAP through at least one SCC. [Reference numerals] (110) Transmission unit; (120,210) Reception unit; (130) Control unit; (220) Timing information calculation unit; (AA) Random access preamble; (BB) Information about timing advance
Abstract:
PURPOSE: A random access signal generating method of a narrow band M2M(Machine to Machine) communication device is provided to enable an M2M device to generate random access signals in a mobile communication system based on 3GPP(3rd Generation Partnership Project) LTE(Long Term Evolution). CONSTITUTION: A UE(User Equipment) receives information related to a transmission point and a random access preamble format from an upper layer(S701). The M2M communication device generates random access signals by using information related to a frequency resource block and the received access preamble format(S703). The information related to the frequency resource block is information for the random access signal set according to the bandwidths of the M2M communication device. [Reference numerals] (AA) Start; (BB) No; (CC) Yes; (DD) End; (S703) Generating a random access signal using a fixed parameter value related to acquired information and PRB numbers; (S705) Transmitting a generated random access preamble; (S707) Is a random access response received?; (S709) Transmitting scheduled uplink; (S710) Receiving information related to the format and transmission timing of the random access preamble from an upper layer;
Abstract:
PURPOSE: A gold code generation device is provided to generate a PN(Pseudo-random Noise) sequence by using a masking method. CONSTITUTION: A first sequence generating part(220) generates a first pseudo noise sequence based on first masking information including a first initial value and predetermined time delay information. A second sequence generating part(230) generates a second PN sequence based on second masking information including a second initial value and the selected time delay information. A code generating part(240) generates a gold code by using the first PN sequence and the second PN sequence. The first sequence generating part comprises a first mask register(221), a first initial register(222), a first shift register(224), and a first operation part(225).
Abstract:
A testing system and a testing method of a photo diode array module for overseeing optical signal performance are provided to reduce the cost for testing the photo diode array module by increasing test efficiency. A testing system of a photo diode array module for overseeing optical signal performance includes a controller(60), a laser source(10), an optical switch(20), a testing unit(40), and a detection unit(50). The controller has an embedded control program for controlling a test and stores test results. The laser source supplies optical signal under the control of the controller. The optical switch inputs optical signals to each input port of an N-channel photo diode array module. The testing unit periodically changes the channel of a connection unit set by the optical switch to correspond to the channel of the photo diode array module. The detection unit provides a photo diode with reverse bias voltage and detects optical current values of the photo diode for each channel.