Abstract:
본 발명은 직교 주파수 분할 다중 방식의 신호 송신 방법 및 이에 적용되는 장치를 개시한다. 본 발명에 따른 직교 주파수 분할 다중 방식의 신호 송신 방법은, 기지국을 디지털신호처리부(DU: Digital Unit)와 무선신호처리부(RU: Radio Unit)로 물리적인 구분을 하는 구조의 경우 디지털신호처리부(DU: Digital Unit)와 무선신호처리부(RU: Radio Unit)를 상호 연동케 하는 직렬 인터페이스 전/후로 압축 구성 및 압축해제 구성을 추가하고, 직교 주파수 분할 다중(OFDM: Orthogonal Frequency Division Multiplexing) 신호의 직교성을 보장하기 위한 주기적 전치부호(CP: Cyclic Prefix)를 신호에 삽입하는 구성을 무선신호처리부(RU: Radio Unit)에서 수행하도록 하기 위한 구성을 갖춘다. 따라서, 본 발명은 디지털신호처리부(DU: Digital Unit)와 무선신호처리부(RU: Radio Unit) 간에 송 수신되는 신호전송 효율을 향상시킬 수 있다.
Abstract:
PURPOSE: A high frequency transception apparatus is provided to configure a high frequency transception coupling front-end which supports time division duplex/frequency division duplex (TDD/FDD) and to support various functions which is required with the development of a wireless communication technology through single transception coupling front-end. CONSTITUTION: A transmission unit hybrid coupler (304) outputs a transception signal which is divided into a first output and a second output having 90 degrees phase difference. A first circulator (303) inputs the first output of the transmission unit hybrid coupler to a first terminal. The first circulator outputs the inputted first output to a second terminal. A second circulator (306) inputs the second output of the transmission unit hybrid coupler to the first terminal.
Abstract:
PURPOSE: A multi-model local oscillator and a method for oscillating the same are provided to generate local oscillating signal using demultiply signal which has a lower frequency than that of oscillating signal. CONSTITUTION: A demultiplying unit(120) outputs a plurality of demultiply signals by demultiplying a pre-set frequency band of oscillating signal which is output from a voltage control oscillator. A signal selection unit(130) selects one of the demultiply signals in response with selection control signal. A mixer(140) mixes the selected signal and one of the demultiplying signals and outputs local oscillating signal.
Abstract:
A method for measuring a variable bandwidth wireless channel and a transceiving apparatus therefor are provided to fix a D/A operation rate and generate a variable bandwidth signal by varying oversampling according to a measured bandwidth in a transmitting apparatus to use the same transmission IF regardless of bandwidth, thereby easily realizing the transmitting apparatus. A transmitting apparatus includes a pre-processing unit(211~214) and a realtime processing unit. The pre-processing unit generates and stores a measured sequence that an original sequence for the measurement of a wireless channel is converted into an upper frequency by variable oversampling according to a predetermined D/A(Digital to Analog) operation rate and a measured bandwidth and a fixed transmission IF(Intermediate Frequency) after bandwidth limitation filtering. The real-time processing unit transmits a measured signal converting the stored measured sequence according to the D/A operation rate to a wireless channel.