宽带HFC网络回传通路输入噪声抑制的研究

Study on Suppressing Noise on Upstream Channel in HFC Network

在 ＨＦＣ网络回传通路各类噪声中，输入噪声占有相当大的比重。本文将输入噪声抽象为一种窄带干扰，从数字信号处理的角度对其采取非线性抑制措施，并把归一化ＦＴＦ算法运用到了该干扰抑制器中，提高了信号处理的实时性。在ＱＰＳＫ调制系统下仿真看到其信噪比和误码率改善勤很可观。

Ingress noise has great proportion in sorts of noise on upstream channel in HFC. This paper abstracts the ingress noise into a narrowband interference and takes a nonlinear suppression measure from the point of signal processing. Gained normal FTF algorithm is applied to the narrowband interference suppresser, which improves the real-time ability of system. The SNR improvement and code error probability reduce are considerable in QPSK modem system.