Abstract:
PURPOSE: A space multiplexing transmission method and a device thereof are provided to equally control the reception range of a signal transmitted to each antenna. CONSTITUTION: R signals passed through a serial-parallel converter(410) are alternatively inputted to amplifiers(420,430) in every input time The signals are transmitted through antennas(440,450). R signals are inputted as an input signal to an amplifier connected to a first antenna, wherein the r signals are precoded with a transmission signal x to which a transmission power weight is alternatively applied. R signals are inputted as an input signal to an amplifier connected to a second antenna, wherein the r signals are precoded with a transmission signal x to which a transmission power weight is alternatively applied.
Abstract:
PURPOSE: A broadcasting data transmission system is provided to improve data transmission performance in a fading channel by decoding a data stream. CONSTITUTION: A broadcasting data transmission apparatus controls the transmission power of a data stream according to a modulation method about each transmission antenna(310). The broadcasting data transmission apparatus previously codes the data stream controlled by the transmission power using a pre-coding matrix according to the modulation method(320). The broadcasting data transmission apparatus transmits the coded data stream to a reception unit using the transmission antenna(330).
Abstract:
PURPOSE: A diversity device and method thereof are provided to improve a performance of a wireless communication system through a rotation of signal in a fading channel environment. CONSTITUTION: A receiving unit receives at least one input vector signal. A constellation rotation signal configuration unit(110) generates at least one vector signal through rotation of at least one received input vector signal. A signal division unit(120) divides at least one rotation vector signal into an imaginary number value and a real number value.
Abstract:
쿼터너리준직교시퀀스를이용한새로운쿼터너리준직교시퀀스공간변조방법을제공한다. 본발명의실시예에따른쿼터너리준직교시퀀스공간변조방법은쿼터너리준직교시퀀스로구성된쿼터너리준직교행렬로사용하여안테나선택에사용되는비트수를증가시키는방법이다. 이는, 동일한송신안테나및 동일한변조를사용할경우전송가능한비트수를증가시켜전송율을높일수 있다. 또한, 동일한송신안테나에서동일한비트수를전송할때 낮은변조차수를사용할수 있어심볼변조에대한 BER을낮출수 있어전체적인성능이득을얻을수 있다.