可见光通信网络信号非线性失真自适应校正方法研究

Research on adaptive correction method for nonlinear distortion of signals in visible light communication networks

可见光通信网络是现今通信领域中的主要构成部分之一,但其应用的物理设备(LED照明设备)具有非线性特征,致使可见光通信网络信号出现非线性失真情况,影响着用户通信的质量,故提出可见光通信网络信号非线性失真自适应校正方法研究。通过深入分析可知信号非线性失真分为非线性转换失真和非线性限幅失真,以此为基础,设计信号非线性失真校正电路(DG预失真校正电路与DP预失真校正电路),引入自适应算法制定信号非线性失真自适应校正架构,确定信号非线性失真自适应校正公式,从而实现了信号非线性失真的有效校正。实验数据显示:应用提出方法获得的信号非线性失真自适应校正结果中不存在非线性失真现象,通信信号接收误码率最小值为3%,充分证实了提出方法应用性能更加优质。

Visible light communication networks are one of the main components in the current communication field,but their physical devices(LED lighting devices)have nonlinear characteristics,resulting in nonlinear distortion of visible light communication network signals,which affects the quality of user communication.Therefore,an adaptive correction method for nonlinear distortion of visible light communication network signals is proposed.Through in-depth analysis,it can be concluded that signal nonlinear distortion is divided into nonlinear conversion distortion and nonlinear limiting distortion.Based on this,a signal nonlinear distortion correction circuit(DG pre distortion correction circuit and DP pre distortion correction circuit)is designed,and an adaptive algorithm is introduced to develop an adaptive correction architecture for signal nonlinear distortion.The adaptive correction formula for signal nonlinear distortion is determined,thus achieving effective correction of signal nonlinear distortion.The experimental data shows that there is no nonlinear distortion phenomenon in the adaptive correction results of signal nonlinear distortion obtained by applying the proposed method,and the minimum error rate of communication signal reception is 3%,fully confirming that the proposed method has better application performance.