Abstract:
본발명의실시예에따른소형기지국안테나는제 1 및제 2 마이크로스트립라인으로에칭되어, 큐브내에제공되는기판; 상기제 1 마이크로스트립라인상에제공되는제 1 금속단락판및 상기제 1 금속단락판상에제공되는제 1 방사패치를포함하는제 1 역 F 안테나; 상기제 2 마이크로스트립라인상에제공되는제 2 금속단락판및 상기제 2 금속단락판상에제공되는제 2 방사패치를포함하고, 상기제 1 역 F 안테나에대향하는제 2 역 F 안테나; 그리고상기제 1 역 F 안테나와제 2 역 F 안테나사이에제공되는격리체를포함한다. 본발명에의하면, 넓은대역폭과높은이득을얻을수 있으며, 안테나사이의격리도를향상시킬수 있다.
Abstract:
According to the present invention, in order to compensate transmission characteristics to allow a multi-array transmitter of a wire or wireless system to effectively transmit a transmission signal, a nonlinear pre-filter and a transfer function compensating filter are independently installed on a transmission path. A complex compensation value for allowing a high power amplifier of which non-linearity is determined according to the amplitude of a signal to be linear and a complex compensation value for allowing transfer characteristics between arrayed transmitters to coincide with each other are adaptively applied. By adaptively applying an arbitrary transmission filler property, the number of additional digital circuits for compensating linearity and an array error of a transmitter may be reduced. In addition, according to the present invention, the functions of compensating linearity and an array error are performed by one multi-functional filter so that the number of unnecessary digital circuits, caused because the functions of compensating linearity and an array error are performed by an additional profiler according to the prior art, can be prevented from being increased, thereby reducing the implement cost and more effectively transmitting a transmission signal.
Abstract:
PURPOSE: The orthogonal frequency division multiplexing transmission method and the device applies the same is provided to improve transmission efficiency of a signal which transmitted and received between a digital signal processor and a wireless signal process part. CONSTITUTION: The digital signal processor (100) classifies the data for transmission to more than 2 of data symbols, modulates the data to perform a parallel transmission through multiple subcarrier waves corresponded to data symbols more than 2. The digital signal processor classifies modulated data according to the predetermined compression block units, executes compression and outputs the compressed modulated data. A serial interface (200) delivers compressed modulated data which received from the digital signal processor to network. The wireless signal process part receives compressed modulated data, decompresses the data thereof and restores as modulated data, the restored modulated data is wirelessly transmitted after converted into the time domain signal. [Reference numerals] (100) Digital signal processing unit; (200) Series interface unit; (300) Wireless signal processing unit; (AA) Data for transmission; (BB) Wireless transmission
Abstract:
PURPOSE: A measurement method using a multi antenna measuring system is provided to reduce time for measuring a channel and to increase the accuracy of a visible region determination by classifying the measured data into visible region data and invisible region data. CONSTITUTION: A measurement method using a multi antenna measuring system is comprised of the following steps: a step of measuring a K-factor parameter(KF) and a delay dispersion parameter(DS) by using wireless space data which is measured by the multi antenna measuring system; a step of calculating the estimated K-factor parameter and the delay dispersion parameter; and a step of determining the calculated result as the visible region data if the result is equal or greater than the predetermined reference value or as the invisible region data if the result is less than the predetermined reference value. [Reference numerals] (AA) Start; (BB) K-factor parameter; (CC) Region spread parameter; (DD) No; (EE) Yes; (FF) Visible region data determination; (GG) Invisible region data determination; (HH) Stop
Abstract:
PURPOSE: A radio channel measuring apparatus using a multiple antenna is provided to minimize performance of reception noise index by gain of a low noise amplifier. CONSTITUTION: A multiple antenna(310) includes two or more antenna elements. A multiple path processing unit(320) divides two or more antenna elements into groups. The multiple path processing unit amplifies signals which are transmitted through two or more antenna elements. The multiple path processing unit outputs the amplified signal to a single path processing unit.
Abstract:
PURPOSE: A relay equipment and a method thereof in the wireless telecommunications system are provided to flexibly react with the network situation. CONSTITUTION: A signal detection unit comprises low noise amplifiers(131,164), and couplers(132,163) and signal detection ends(135,165). The signal detection unit detects the size of a signal by receiving the signal from the base station or the terminal. A controller(140) compares the size of the signal detected from the signal detection unit with the size of the signal predetermining in system and forwards the comparison information. An output signal control part comprises gain control shifts(133,162) and output amplification stages(134,161). The output signal control part controls and amplifies the gain of the signal transmitted to the base station or the terminal.
Abstract:
PURPOSE: A wireless relay channel measuring device is provided to measure a wireless relay channel about a wireless link between a base station, relay and a terminal. CONSTITUTION: According to a user input, a control unit(110) establishes one operating mode among a base station mode, a relay mode or a terminal mode. According to the fixed operating mode, the control unit performs transceiving control of a signal for wireless relay channel measurement.
Abstract:
본 발명은 가변 대역폭 무선채널 측정 방법 및 이를 위한 송수신장치에 관한 것으로, 송신부에서 D/A 동작속도를 고정시키고 측정대역폭에 따라 오버샘플링을 변화시켜 가변 대역폭 신호를 생성하고, 수신부에서 측정대역폭에 따라 수신 중간주파수 및 A/D 동작속도를 변화시키는 하나의 장치로 가변 대역폭의 무선채널을 측정하기 위한, 가변 대역폭 무선채널 측정 방법 및 이를 위한 송수신장치를 제공하고자 한다. 이를 위하여, 본 발명은 무선채널 측정 송신장치에 있어서, 무선채널의 측정을 위한 원 시퀀스를 '기 결정된 D/A 동작속도 및 측정대역폭에 따른 가변 오버샘플링'과 대역제한 필터링한 후 '고정된 송신 중간주파수'로 상향 주파수 변환한 측정시퀀스를 생성 및 저장하기 위한 선처리 수단; 및 상기 저장된 측정시퀀스를 상기 D/A 동작속도에 따라 변환한 측정신호를 무선채널로 송신하기 위한 실시간 처리 수단을 포함한다. 가변 대역폭, 가변 오버샘플링, 무선채널 측정, 디지털 중간주파수, 대역제한 필터
Abstract:
본 발명은 직교 주파수 분할 다중화(OFDM)방식을 사용하는 무선 시스템중 송신 시스템에서 디지털/아날로그 변환기의 샘플/홀드 작용에 의한 송신 신호의 왜곡을 보상하기 위한 고주파 왜곡 현상의 보상 장치 및 방법에 관한 것이다. 디지털 송신 시스템에서 디지털/아날로그 변환기의 샘플/홀드 변환 방식에 의해 송신 신호에서 송신 신호 대역의 가장자리 주파수 신호가 송신 신호의 샘플 주파수에서 영점을 가지는 싱크 함수에 의해 주파수 영역에서 신호의 감쇄가 일어나는 신호 왜곡이 생기게 된다. 본 발명에서는 기저대역 신호 처리단에서의 디지털 신호가 주파수 영역의 신호이므로 주파수 영역에서 역 싱크 함수의 계수를 신호의 가중치로 곱하여 왜곡을 보상하며, 하나의 곱셈기와 역 싱크 함수의 계수를 저장하는 룩업 테이블만으로 디지털/아날로그 변환기의 왜곡을 보상할 수 있으므로 간단하고 효율적으로 고주파 왜곡 현상을 보상할 수 있다. 직교 주파수 분할 다중화, OFDM, 무선 시스템, 싱크 함수, 디지털/아날로그 변환기