CAJ | 학술논문

介绍了一种应用于感知无线电的射频收发机,该射频收发机包含一个零中频接收机和一个直接上变频发射机.在与电视信号共存的环境中,射频接收机采用可调信道滤波器组来抑制邻近信道干扰.采用了具有宽动态范围、高线性度的低噪声放大器来提升零中频接收机的抗干扰性能.同时,采用高线性功率放大器来提高直接上变频发射机的邻近信道功率比特性.测试得到的误差矢量幅度结果显示,通过采用信道滤波器组使零中频接收机的抗干扰性能得到了很大提高.当直接上变频发射机发射输出功率达27 dBm时,在中心频率为714 MHz的信道上,测得直接上变频射频发射机的邻近信道功率比为-47.98 dBc.
개소료일충응용우감지무선전적사빈수발궤,해사빈수발궤포함일개령중빈접수궤화일개직접상변빈발사궤.재여전시신호공존적배경중,사빈접수궤채용가조신도려파기조래억제린근신도간우.채용료구유관동태범위、고선성도적저조성방대기래제승령중빈접수궤적항간우성능.동시,채용고선성공솔방대기래제고직접상변빈발사궤적린근신도공솔비특성.측시득도적오차시량폭도결과현시,통과채용신도려파기조사령중빈접수궤적항간우성능득도료흔대제고.당직접상변빈발사궤발사수출공솔체27 dBm시,재중심빈솔위714 MHz적신도상,측득직접상변빈사빈발사궤적린근신도공솔비위-47.98 dBc.
An RF transceiver composed of a zero-IF receiver and a direct up-conversion transmitter for cognitive radio applications is presented. The adjustable channel filter array in the receiver is used to suppress adjacent channel interference in televisions signal coexistence environments. The low noise amplifier (LNA) with wide dynamic range and high linearity is employed to enhance the anti-interference competence of the zero-IF receiver. Meanwhile, the high linearity power amplifier (PA) is used to promote the adjacent channel power ratio (ACPR) characteristic of the direct up-conversion transmitter. The measured error vector magnitude (EVM) results show that the anti-interference competence of the zero-IF receiver is dramatically enhanced by employing a channel filter array. The measured ACPR of the direct up-conversion transmitter is -47.98 dBc on the channel centered at 714 MHz when the output power is 27 dBm.