噪声补偿的室内可见光通信系统信道预测

Channel prediction of indoor visible light communication system based on noise compensation

通信系统信道内存在大量干扰,传统的信道预测方法未考虑噪声的影响,导致预测结果不够准确、误码率较高,导致通信系统性能降低,基于此,提出噪声补偿的室内可见光通信系统信道预测。首先分析可见光通信原理,建立通信信道模型;其次针对通信过程中噪声影响出现的信道损耗情况,计算直射与漫射信道的直流增益和总功率,然后利用POPC与类导频相结合的噪声补偿方法弥补信道损耗,在信道模型基础上,通过正交频分复用的方式对信道系统进行调制,采用最小误差方差算法完成信道预测。实验结果表明:所提方法使系统需要的导频数量减少,降低了系统开销,且预测误码率较低,提高了室内可见光通信系统的性能。

There is a lot of interference in the communication system channel,and the traditional channel prediction method does not consider the influence of noise,leading to the inaccurate prediction results and the high bit error rate(BER),which leads to the degradation of the performance of the communication system.Based on this,the channel prediction of indoor visible light communication system with noise compensation is proposed.Firstly,the principle of visible light communication is analyzed,and the communication channel model is established.Secondly,according to the channel loss affected by noise in the communication process,the DC gain and total power of direct and diffused channels are calculated.And then,the noise compensation method combined with POPC and pilot is used to compensate the channel loss.On the basis of the channel model,the signal is treated by orthogonal frequency division reuse.The channel system is modulated with the minimum error variance algorithm to complete the channel prediction.The experimental results show that the proposed method reduces the number of pilots required by the system reduces the system overhead,predicts the lower error rate and improves the performance of the indoor visible light communication system.