使用usrp n210,利用Labview实现正弦信号收发，一方面可以利用labview实现实际信号在空中收发，另一方面可以检验设备正常运行。(Using USRP N210 and Labview to transmit and receive sinusoidal signals, on the one hand, it can use LabVIEW to transmit and receive actual signals in the air, on the other hand, it can check the normal operation of the equipment.)