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:
무선 채널을 통해 무선 신호를 수신하는 무선 신호 수신 장치는 무선 신호를 제1 이득에 따라 증폭하여 제1 증폭된 신호를 생성하고, 제1 증폭된 신호의 크기를 측정하여 제1 이득을 결정한다. 그리고 무선 신호 수신 장치는 제1 증폭된 신호의 주파수를 하향변환하여 하향 변환된 신호를 생성하고, 하향 변환된 신호를 제2 이득에 따라 증폭하여 제2 증폭된 신호를 생성한다. 또한 무선 신호 수신 장치는 제2 증폭된 신호의 크기를 측정하여 제2 이득을 결정한다. 이득 제어, 증폭, 크기 측정, RF, 기저대역, 무선 신호
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.