Abstract:
본 발명은 하나의 셀에 디지털신호 처리부 및 적어도 하나 이상의 중계장치에 대한 것이다. 중계장치는 디지털 인터페이스 모듈 및 무선주파수 모듈을 포함한다. 디지털 인터페이스 모듈은 디지털 신호 처리부로부터 기저대역의 디지털 신호를 수신한다. 디지털 인터페이스 모듈은 디지털신호를 통신규약에 맞게 변환한다. 또한, 디지털 인터페이스 모듈은 무선주파수 신호의 출력레벨을 제어하는 신호를 무선주파수 모듈에 출력한다. 따라서, 셀 환경 및 이동통신망의 변화에 따라 중계장치의 디지털 인터페이스 모듈의 변경만으로 무선주파수 신호의 출력레벨 조절이 가능하다. 또한, 각각의 중계장치는 서로 다른 무선주파수 신호의 출력이 가능하므로, 데이터의 양이 증가한다.
Abstract:
본 발명의 실시 예에 따른 단말간 집적 통신을 수행하는 단말기는, 상향링크 채널 신호 및 하향링크 채널 신호를 송수신하는 안테나, 상기 안테나의 송수신 신호를 상향링크 채널 신호와 하향링크 채널 신호로 분리하는 듀플렉서, 상기 상향링크 채널 신호를 시분할 다중화 방식(TDD)으로 스위칭하여 상향링크 송신 블록과 제 1 수신 블록으로 분리하는 스위치, 그리고 상기 듀플렉서로부터 제공되는 상기 하향링크 채널 신호를 기저 대역으로 변환하는 제 2 수신 블록을 포함한다.
Abstract:
An apparatus for improving isolation for a transmission/reception antenna according to the present invention may include a 180° hybrid coupler that divides a transmission signal into two outputs having a phase difference of 180° for delivery to respective circulators in a beam former and delivers two reception signals delivered from the beam former to a reception port and the beam former that radiates a transmission signal having a 0° phase and a transmission signal shifted to a 180° phase which are delivered from the 180° hybrid coupler to respective antennas through respective phase shifters and delivers two reception signals having the same phase which are received through the respective antennas from the 180° hybrid coupler.
Abstract:
An enclosure device for a wireless communication apparatus having a heat dissipation structure of the present invention may comprise a stacked RF module consisting of a plurality of communication devices manufactured as functional modules; and a pair of heat dissipation plates attached to both sides of the stacked RF module in order to releases the heat, which is generated in the stacked RF module, to the outside.
Abstract:
PURPOSE: A downlink resource allocating method and apparatus thereof in a broadband wireless communication system are provided to supply a broadband wireless multimedia service to a downlink resource allocating apparatus. CONSTITUTION: A digital IF(Intermediate Frequency) board(210) converts a baseband signal into a digital intermediate frequency. The digital IF board generates a plurality of frequencies. The digital IF board assigns the different frequencies to a plurality of modems. The digital IF board converts a digital signal into an analog signal. A broadband RF(Radio Frequency) module(220) converts the converted analog signal into the RF frequency required for the wireless transmission.
Abstract:
PURPOSE: An apparatus and a method for changing the channel of a portable terminal are provided to improve the channel receiving rate of the portable terminal. CONSTITUTION: The channel information of a first region which corresponds to location information is inquired(104). A second region which is adjacent to the first region is inquired(106). First signal which is received based on the channel information of the first region is compared with second signal which is received based on the second region(108). Based on the comparison result, either of the channel information of the first region and the channel information of the second region is selected(110).
Abstract:
An apparatus and a method for compensating for carrier leakage in a quadrature modulation system are provided to realize a carrier leakage compensating apparatus simply by using various quadrature modulators, thereby suppressing carrier leakage. A quadrature modulation unit(300) outputs a leakage carrier signal about an in-phase path and a quadrature phase path. The in-phase path and the quadrature phase path are made by the first and second bias voltages and difference between the first and second control voltages. A coupler(500) extracts a partial leakage carrier signal among the outputted leakage carrier signals. A detection unit(600) detects a size of the extracted leakage carrier signal to measure a carrier leakage amount. The detection unit converts the leakage carrier signal into a DC signal. Controllers(900,910) output the first and second control voltages by comparing the DC signal with the first and second reference voltages.
Abstract:
A gain control method of a reception signal and a reception apparatus of a radio frequency signal are provided to reduce the variable range of automatic gain control amplification by performing automatic gain control amplification with a gain measured in a digital signal state. A low noise amplification end(110) disconnects the operations of plural amplifiers(111,112,113) according to first gain to generate a first amplification signal, and a first power measurer(120) applies the measured strength of the first amplification signal to a first power controller(130). The first power controller determines the first gain according to the strength of the first amplification signal, and compares the strength of the first amplification signal with preset reference strength. Based on the comparison, the first gain is determined.