Abstract:
The present invention relates to an orthogonal precoder for improving the performance of a spatial multiplexing method in a mobile broadcast system. According to the present invention, the performance is improved by providing the orthogonal precoder with high performance improvement in a Rician channel environment with an eraser phenomenon by serially connecting a precoder with the spatial multiplexing method with two transceiver antennas.
Abstract:
쿼터너리준직교시퀀스를이용한새로운쿼터너리준직교시퀀스공간변조방법을제공한다. 본발명의실시예에따른쿼터너리준직교시퀀스공간변조방법은쿼터너리준직교시퀀스로구성된쿼터너리준직교행렬로사용하여안테나선택에사용되는비트수를증가시키는방법이다. 이는, 동일한송신안테나및 동일한변조를사용할경우전송가능한비트수를증가시켜전송율을높일수 있다. 또한, 동일한송신안테나에서동일한비트수를전송할때 낮은변조차수를사용할수 있어심볼변조에대한 BER을낮출수 있어전체적인성능이득을얻을수 있다.
Abstract:
본 발명은 이동방송 시스템에서 공간 다중화 기법의 성능 향상을 위한 직교 선부호기에 관한 것으로서, 두 개의 QAM 변조 신호들로 구성된 입력 벡터 를 입력받아 에 곱하여 선부호화한 송신 벡터 을 두 개의 송신 안테나를 통하여 공간 다중화기로 송신하는 선부호기; 송신 벡터 을 2×2의 채널 행렬에 의해 독립적인 채널을 통과시켜 수신 벡터 을 ML 디코더로 송신하는 공간 다중화기; 및 두 개의 수신 안테나를 통하여 수신한 수신 벡터 을 복호화하는 ML 디코더;를 포함한다. 상기와 같은 본 발명에 따르면, 각각 2개의 송수신 안테나를 가지는 공간다중화 기법과 선부호기를 직렬 연접하여 이레이저 현상이 생길 수 있는 Rician 채널 환경에서 큰 성능 향상을 얻는 직교 선부호기를 제공함으로써, 종래의 공간 다중화 기법에 비하여 월등한 성능 향상을 도모하는 효과가 있다.
Abstract:
PURPOSE: A signal transmission system using a real number line coder and a method thereof are provided to have an identical function with the existing Zhu-DSTM method and are provided to lower the complexity of the reception end, thereby showing the improved performance. CONSTITUTION: A signal transmission system (100) comprises a real number line coder (110), a first encoder (120), a second encoder (130), a calculator (140), and a delay unit (150). The line coder receives an input vector as a first sub-input vector and a second sub-input vector, encodes the input vector as real number, and outputs as an encoded first sub-input vector and an encoded second sub-input vector. A first encoder receives and encodes the encoded first sub-input vector which is outputted from the line coder, and outputs as a first sub-signal matrix. A second encoder receives and encodes the encoded second sub-input vector which is outputted from the line coder, and outputs as a second sub-signal matrix. The calculator uses the first sub-signal matrix, the second sub-signal matrix, and a first final transmission code matrix, which is generated based on the input vector received before the input vector, to generate a second final transmission code matrix of the input vector. [Reference numerals] (110) Real number line coder; (120) First encoder; (130) Second encoder; (140) Calculator; (150) Delay unit
Abstract:
PURPOSE: An envelope curve detecting apparatus is provided to improve receiving sensitivity and to increase a dynamic range. CONSTITUTION: An envelope curve detecting apparatus includes a mixer(510), a bias voltage supply unit(530), and a DC intercept capacitor(550). The mixer receives a digital modulation signal and outputs a square signal which is raised from the digital modulation signal if a bias voltage is applied. The bias voltage supply unit supplies the bias voltage to the mixer. The DC intercept capacitor is connected to the mixer and blocks a DC component which is included in the square signal. [Reference numerals] (530) Bias voltage supply unit