一种副载波调制无线光通信大气噪声抑制方法技术

本发明专利技术公开的一种副载波调制无线光通信大气噪声抑制方法，首先建立大气信道数学模型；然后根据大气信道数学模型，对信源码字采用4FSK数字副载波进行调制，得到已调信号，然后对已调信号采用同态滤波技术进行去噪，得到去噪后的信号；最后对去噪后的信号采用过零检测法进行解调，得到消噪后的码字。本发明专利技术大气噪声抑制方法，路线简单、经济而且切实可行，易于实现，是专门针对无线激光通信易受大气影响导致通信误码率上升而提出的。该方法降低了高通信速率副载波调制无线激光通信系统误码率，能够很好的抑制大气湍流对通信系统的影响，为FSO无线宽带接入、实现高速数字通信提供了一种新的方法。

An atmospheric noise suppression method for subcarrier modulation wireless optical communication

The invention discloses a method for suppressing a subcarrier modulation in wireless optical communication, atmospheric noise, first establish the mathematical model of atmospheric channel; then according to the mathematical model of the atmospheric channel, the source code using 4FSK digital subcarrier modulation, get the modulated signal and the modulated signal denoising using homomorphic filtering technique to get the signal after noise; at the end of the signal after denoising using zero crossing detection demodulation, obtained after denoising code. The method for suppressing the atmospheric noise of the invention is simple, economical, practical and easy to implement, and is specially aimed at the wireless laser communication which is easy to be influenced by the atmosphere and leads to the increase of the error rate of the communication. This method reduces the high communication rate of subcarrier modulation in wireless laser communication system BER, can very good inhibitory effect of atmospheric turbulence on the communication system, and provides a new method for high-speed digital communication to realize wireless broadband access, FSO.

【技术实现步骤摘要】

【技术保护点】
１．一种副载波调制无线光通信大气噪声抑制方法，其特征在于，具体按照以下步骤实施：步骤１：建立大气信道数学模型；步骤２：根据步骤１得到的大气信道数学模型，对信源码字采用４ＦＳＫ数字副载波进行调制，得到已调信号，然后对已调信号采用同态滤波技术进行去噪，得到去噪后的信号；步骤３：对步骤２得到的去噪后的信号采用过零检测法进行解调，得到消噪后的码字。

【技术特征摘要】

【专利技术属性】
技术研发人员：陈丹，柯熙政，李建勋，黄根全，
申请(专利权)人：西安理工大学，
类型：发明
国别省市：87