可见光通信中概率整形算法研究

Research on probabilistic shaping algorithm in visible light communication

概率整形技术通过改变发送信源的概率分布,可进一步提高可见光通信系统的信道容量。提出一种新的概率整形算法,首先引入正交频分复用调制建立可见光通信模型,然后通过理论推导出星座点误符号率,并根据不同星座点的理论误符号率来生成发送端信源的概率分布。仿真结果表明:该算法生成的信源不仅能更好地适应当前信道状况,还避免了多次发送训练求取接收端误符号率的过程;与现有的概率整形算法相比,所提算法可以获得更高的信息传输速率。

Probabilistic shaping technology can improve the channel capacity of visible light communication system by changing the probability distribution of transmitting source.A new probabilistic shaping algorithm is proposed.Firstly,orthogonal frequency division multiplexing modulation is introduced to establish the visible light communication model.Then,the false sign rate of constellation points is derived theoretically.The simulation results show that the source generated by this algorithm can not only adapt to the current channel condition better,but also avoid the process of obtaining the false sign rate of the receiver through multiple transmission training.Compared with the existing probabilistic shaping algorithms,the proposed algorithm can achieve a higher information transmission rate.