PDMA的可见光通信系统

提出了一种基于新型非正交多址接入技术——图样分割多址接入（PDMA）技术的可见光通信系统.PDMA技术可同时优化多用户可见光通信系统的发送端和接收端，实现非正交传输.在发送端，在相同的时域和频域资源内，为实现资源复用，需要将多个用户信号的功率域、空域、编码域进行单个或多个联合编码.接收端进行多用户检测时，采用消息传递算法优化可见光通信系统的整体性能.相比于正交频分复用多址接入技术，PDMA技术在支持用户数量方面能够提供150%的过载增益.对可见光通信系统进行了理论分析、模拟仿真和实验验证，实验结果表明，在有限的LED带宽约束下，当误码率达到10^-3时，传输距离可达120 cm.

Study on PDMA Based Visible Light Communication Systems

A visible light communications (VLC) system based on non-orthogonal multiple access technology-pattern division multiple access (PDMA), is proposed. PDMA technology can simultaneously optimizes the transmitter and receiver of a multi-user VLC system to achieve non-orthogonal transmission. To achieve the resources reuse at the transmitter under the conditions of frequency domain at the same time, it is necessary to use the joint coding of power, space and channel coding of the multiusers. The multiuser detection at the receiver is, based on message passing algorithm, to optimize the performances of VLC. PDMA can support 150% overload gain of the number of users compared with orthogonal frequency division multiplexing access. Simulation verification of the VLC system is carried out and shows that the transmission distance can achieve 120 cm for the bit error rate of 10^-3 with limited bandwidth of LEDs.