Abstract:
PURPOSE: A base station, a terminal, and an operation method thereof are provided to support a terminal in a low power mode and to reduce power consumption of a terminal. CONSTITUTION: If a structure of a network is in a high-speed mode, a terminal is cooperated with a base station of the network(S103,S105). The terminal is converted into a low-speed mode(S107). The terminal is cooperated with the base station in the low-speed mode(S109). The terminal is converted into a low-power mode(S111). The terminal enters an active section(S113,S115).
Abstract:
PURPOSE: A receiving apparatus in an OFDM(Orthogonal Frequency Division Multiplexing) system is provided to detect reception signals by estimating distortion matrices combining the unbalanced component of in-phase signals and Quadrature-phase signals and a channel frequency response characteristic. CONSTITUTION: A distortion matrix estimating unit receives a preamble signal including two different long training field symbols. The distortion matrix estimating unit estimates a distortion matrix. An OFDM(Orthogonal Frequency Division Multiplexing) signal processing unit compensates for distortion components from the reception signals by using the distortion matrix. A transmitter includes a preamble generation unit and an OFDM signal processing unit. The preamble generation unit transmits the preamble through two symbol periods by applying Alamouti technique to make a 2x2 non-singular matrix. The OFDM signal processing unit processes transmission signals and the preamble by OFDM.
Abstract:
본 발명은 초광대역 시스템에서의 피 간섭 신호 검출방법 및 이를 수행하는 초광대역 단말에 관한 것이다. 본 발명에 따르면, 디지털 신호로 변환된 수신신호를 주파수 천이시키고 필터링 한 뒤, 피 간섭 신호가 이미 알려진 시스템 신호에 해당하는 경우에는 해당 시스템 신호와의 신호상관을 통해 피 간섭 신호의 수신레벨 및 피 간섭 신호 검출여부를 결정하고, 피 간섭 신호가 알려지지 않은 신호인 경우에는 필터링된 신호의 전력 값을 이용하여 피 간섭 신호의 수신레벨 및 피 간섭 신호 검출여부를 결정한다. UWB, 간섭, 상관, interference, DAA
Abstract:
An apparatus and method for receiving signal for extent limitation of timing synchronization in MB-OFDM UWB system is provided to guarantee the stable receiving performance even in the system environment in which the frequency offset is serious. The receiving device(1200) of the MB-OFDM UWB system includes two shift registers(1212, 1214), two packet detection(1216, 1220) and timing synchronization, the comparator(1224), and the routing selector(1226). The shift register classifies sampled digital samples into respective first data and the second data path. The respective packet detection and timing synchronization performs the packet detection and timing synchronization about two data paths. The comparator compares t the cross-correlation value of the timing synchronization spot in two data paths. The routing selector selects data of the route having the larger cross-correlation value.
Abstract:
본 발명은, 다이나믹 이득 조절기 및 자동 이득 제어기를 구비하는 수신기를 포함하는 멀티밴드-직교주파수분할방식 초광대역(MB-OFDM UWB) 시스템에서 효율적인 피코넷을 형성하기 위해, 상기 자동 이득 제어기의 알고리즘을 구동 후 자동 이득 제어 인덱스를 추출하고, 상기 추출된 자동 이득 제어 인덱스를 이용하여 씨씨에이(CCA) 상태를 파악하여 파악된 CCA 상태가 높은 상태이면 상기 자동 이득 제어 인덱스를 이용하여 각 데이터 전송율 별 요구 수신 전력을 기반으로 물리계층에서 MAC 계층으로 제공할 링크 품질 표시(LQI) 정보를 간단하게 생성함으로써, 현 데이터 전송율 모드의 송신전력제어 또는 데이터 전송율 모드 변환이 필요한지 직관적으로 판단할 수 있는 효과가 있다. MB-OFDM UWB 시스템, LQI, RSSI, CCA, AGC 알고리즘, AGC 인덱스, DGC, MAC 계층, 물리계층, ADC, DAC
Abstract:
A method and an apparatus for transmitting data in a wireless communication system are provided to uniformly maintain an intensity of a transmission signal in a whole frame by performing an additional amplification process when the intensity of the transmission signal becomes different. An apparatus for transmitting data in a wireless communication system includes a base band modem transmission unit(410), a digital/analog conversion unit(420), and a wireless transmission unit(430). The base band modem transmission unit modulates data by using a spread code corresponding to each section of a frame. The digital/analog conversion unit converts the modulated signal into an analog signal. The wireless transmission unit amplifies the analog-converted signal using a different amplification rate at each section of the frame and transmits the amplified signal with a carrier wave through a wireless communication.
Abstract:
A UWB(Ultra-Wide Band) transmission apparatus of an OFDM(Orthogonal Frequency-Division Multiplexing) system and a UWB transmission method using the same are provided to enhance accuracy in removing an image signal by increasing a guard frequency interval of a baseband signal and an image signal. A channel coding unit(110) codes data bits according to an MB OFDM(Orthogonal Frequency-Division Multiplexing) PHY standard. An interleaving and mapping unit(120) rearranges the coded data bits and performs severally a mapping operation. A symbol modulation unit(130) modulates the interleaved and mapped data bits to QPSK(Quadrature Phase Shift Keying) symbols by using a QPSK modulation method. A preamble and guard interval insertion unit(150) inserts a preamble and guard interval into a time domain signal. A DAC(Digital Analog Converter)(170) converts I(Inphase) and Q(Quadrature) elements of the time domain signal by using a digital to analog conversion method. An LPF(Low Pass Filter)(180) removes an image from an output signal of the DAC and transmits the corresponding signal through an antenna.
Abstract:
A high-speed low-power consuming fixed-point multiplier and a method thereof are provided to realize high operation speed while reducing hardware area and power consumption by dividing an input bit into a plurality of partial bit groups and calculating/adding partial products of each partial bit group. A partial product unit divides the input bit into the plurality of partial bit groups by each bit unit, calculates the partial product by multiplying a fixed coefficient by each partial bit group, and obtains the final multiplication result by adding the partial products. The partial product unit performs multiplication of each bit group by using each partial product calculator(41,42). The plurality of partial product calculators perform a calculation process in parallel. The partial product unit generates the plurality of partial products by using a CSD(Canonic Sign Digit) algorithm and adds the partial products by using a Wallace-tree algorithm.
Abstract:
A controlling method for FFT(Fast Fourier Transform) window positioning in an MB-OFDM UWB(Multi-Band Orthogonal Frequency Division Multiplexing Ultra Wide Band) system is provided to obtain an optimal receiving environment in a simple way through a MAC-PHY interface standard without correcting additional complex algorithm to overcome a sampling clock offset and a multipath fading environment. A controlling method for FFT window positioning in an MB-OFDM UWB system includes the steps of: obtaining an initial FFT window position and a frequency hopping position(801); modulating a receiving signal by using the FFT window position and the frequency hopping position obtained in the previous step(802); transmitting received data information to a MAC layer through an RX frame structure, and determining whether an error of a packet exists by using an FCS at the MAC layer(803,804); and proceeding to the modulating step if there is no error based on the result of the error determining step, and proceeding to the modulating step if there is any error after adjusting the FFT window position and the frequency hopping position by using a predetermined interface line among the MAC-PHY interfaces to change a register map(806).
Abstract:
1. 청구범위에 기재된 발명이 속한 기술분야 본 발명은 수정 유클리드 알고리즘 연산 장치 및 그 방법과 그를 이용한 리드-솔로몬 복호 장치에 관한 것임. 2. 발명이 해결하려고 하는 기술적 과제 본 발명은 고속 데이터 통신을 위하여 내부에 파이프라인된 새로운 수정 유클리드 알고리즘 연산부를 구비함으로써, 저전력 하드웨어 구현과 함께 내부 지연을 감소시키기 위한, 수정 유클리드 알고리즘 연산 장치 및 방법과 그를 이용한 리드-솔로몬 복호 장치를 제공하는데 그 목적이 있음. 3. 발명의 해결방법의 요지 본 발명은, 수정 유클리드 알고리즘 연산 장치에 있어서, 외부로부터 전달되는 신드롬 신호와 마지막 유클리드 알고리즘 연산셀로부터 궤환된 입력신호 중 하나를 선택하기 위한 입력 선택수단; 상기 신드롬 신호의 입력에 따라, 제1 연산 과정과, 제2 연산 과정을 통해 수정 유클리드 알고리즘 연산을 하기 위한 t개의 수정 유클리드 알고리즘 연산셀 처리수단; 연산셀 t를 통과한 값을 저장하는 중에 상기 제어수단으로부터 출력신호가 입력되면 저장된 값 중에서 선택하여 에러위치 다항식과 에러크기 다항식을 병렬로 출력하기 위한 계산 결과값 저장수단; 및 마지막 연산셀인 상기 연산셀 t로부터 다음단을 위한 시작신호가 입력되면, 상기 제2 연산 과정임을 판단하여 상기 입력신호를 발생하여 상기 입력 선택수단으로 전달하기 위 한 상기 제어수단을 포함한다. 4. 발명의 중요한 용도 본 발명은 리드-솔로몬 복호 장치 등에 이용됨. 리드-솔로몬, 수정 유클리드 알고리즘 연산, 출력 버퍼, 파이프라인