一种提高无杂散动态范围的多通道信号接收方法

当大功率信号进入接收机后，将迫使模数转换器工作在非线性区，并导致接收信号中含有大量非线性杂散。为了抑制杂散并提高接收机对小信号的侦测能力,提出了一种具有无杂散高动态范围(Spurious-free Dynamic Range,SFDR)的信号接收方法。首先通过两路不同的通道同时接收信号，然后利用信号之间的频率差异识别杂散，最后在频域上通过频点替换方案抑制杂散。仿真与实验结果表明，当输入为双30 kHz窄带大信号时，该方案能使SFDR提升15 dB。

Multi-channel signal receiving for improving spurious-free dynamic range

When a high-power signal enters the receiver,the analog-to-digital converter(ADC) will be forced to work in nonlinear region,and there are a large number of nonlinear spurs in the received signal.In order to suppress spurs and improve the capability of detecting small signal,a signal receiving method with high spurious-free dynamic range(SFDR) is proposed.The signal is received by two different channels at the same time.Spurs are identified by frequency differences between signals,and are suppressed by frequency bins replacement.Simulation and experimental results indicate that when the input is a dual narrow-band signal with equal bandwidth of 30 kHz,SFDR can be improved by 15 dB by the proposed method.