一种适用于图像传感器接收机的最佳接收算法

An optimal receiving algorithm for image sensor based receivers

根据图像传感器的工作模型和及其器件噪声特性,分析了图像传感器作为可见光信号接收机时的工作特性,并根据可见光通信(VLC)系统误码率(BER)随图像传感器感光时间和判决门限的变化特性,提出一种适用于图像传感器接收机的最佳接收算法。仿真实验结果表明,本文算法可以根据可见光信号的出射角、传输距离、入射角和码速率等参数,设置图像接收机的最佳感光时间和系统判决门限,有效提高了VLC系统的抗干扰能力,使VLC系统的BER达到最佳。

The newly proposed image sensor based optical receiver has become a key technology and research hotspot with its advantages of high signal-to-noise ratio （SNR）,high receiving bandwidth and spatial division multiplex （SDM） characteristics, over the conditional optical receivers like photodiode （PD） ,photon multiplication tube （PMT） and photodiode array based receiver. This paper firstly studies the characteristics, including the optical and electrical characteristics, of the image sensor based optical receiver based on the analysis results of the image sensor＇s working model. Image sensor device noises, including the fixed pattern noise （FPN） and temporal noise like pixel noise,read noise,analog to digital convertor （ADC） noise, are also carefully studied. An optimized receiving algorithm for the image sensor based receiver is also proposed based on the bit error rate （BER） variation characteristics of visible light communication （VLC） system,with respect to the image sensorrs exposure time and decision threshold, which is closely related to the number of the incident photons and the excited electrons. Simulation results show that the proposed algorithm can generate the optimized exposure time and decision threshold based on the system parameters like emitting light angle, incident light angle, signal propagation distance and data rate,and it can improve the VLC systemls anti-interference capability and achieve its best BER performance, effectively.