高码率无线红外室内传输系统的噪声抑制

主要讨论室内的高码率红外漫射通信;系统在背景光噪声以及障碍物下的性能。系统使用NRZ的OOK调制,在室内环境下,对系统最大的影响来自由荧光引起的噪声,这种噪声存在直流到500kHz的范围里。克服这种噪声的有效方法是把前置放大器的输出通过一个高通滤波器。但这又会发生基线偏移(baseline wander),若使用线性编码或者使用在接收器上活性基线恢复可去除基线偏移。

Mitigating the noise in High-speed Wireless Infrared Indoor Communications

We investigated the high-speed Wireless infrared indoor diffuse communications . We mainly discuss the system performance in the presence of background light or blocks in LOS. In this system, we employ nonreturn-to-zero (NRZ) on-offkeying(OOK) modulation .The major impediment is noise induced by fluorescent lights , which lies in the frequency range of d.c to 500kHz . A reasonable solution for overcoming this impairment is to pass the preamplifier output through a high-pass filter. However, this induces baseline wander. We propose to mitigate baseline wander either by using a line code or by using active baseline restoration .