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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27dBm时,在中心频率为714MHz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-47.98dBc.
An RF transceiver for perceiving radio is introduced, which includes a zero IF receiver and a direct up-conversion transmitter. In an environment coexisting with a television signal, the RF receiver uses an adjustable channel filter bank To suppress adjacent channel interference.Low noise amplifier with wide dynamic range and high linearity is adopted to improve the anti-jamming performance of zero-IF receiver.At the same time, the high linearity power amplifier is used to improve the ratio of adjacent channel power of direct up-conversion transmitter The error vector magnitude obtained from the test shows that the anti-jamming performance of the zero-IF receiver is greatly improved by adopting the channel filter bank.When the direct up-conversion transmitter transmits the output power up to 27dBm, at the center frequency of 714MHz Channel, measured directly up-conversion RF transmitter adjacent channel power ratio -47.98dBc.