【摘要】 理想的软件无线电电台要求对天线接收的模拟信号经过放大后直接采样,但由于技术所限很难实现,而多采用中频采样的方法。由于中频采样增加了较多的模拟电路环节,违背了软件无线电思想的初衷,进而又提出了射频带通采样的方法。本文对这种采样方法进行了分析,并对应用这一方法的实际系统进行了介绍。更多还原

【Abstract】 The ideal software radio requires the sampling system directly samples the amplified signal which was received by the antenna,but it can’t be implemented due to the limit of technology.At present,for implemented by the hardware,one of the popular ways is sampling in the intermediate frequency.Although in this way the complexity of hardware was reduced,but the flexibility of the system was restricted because of the increased analog cell,which violated the soul of the software radio.For incarnate the flexibility enough,this paper gives a way what is sampled the bandpass signal directly in the radio frequency.In this way,the actual radio is closed to the ideal software radio.更多还原