为了克服可见光室内定位技术存在的带宽限制和非线性问题，运用差分脉冲幅度调制（DPAM）的调制方法，来降低带宽限制对通信质量的影响；再基于对可见光通信的信道特性的分析，采用预均衡和光滤波来补偿光源的调制带宽限制和非线性，提高了系统的带宽和吞吐量；最后，运用四个1.5 MHz带宽的LED芯片组成的单个光源进行仿真实验。结果表明，所设计的发射调制系统随着LED芯片数量的增加，系统的总吞吐量也线性增加，实现了高数据率的LED调制。

To overcome the bandwidth constraint and nonlinearity, at first, the differential pulse amplitude modulation (DAMP) method is used to lower the effect of bandwidth constraint on communication quality. And then, based on the analysis of channel characteristics of visible light communication, the modulation bandwidth constraint and nonlinearity of light sources is compensated by pre-equalization and light filtering to improve the bandwidth and throughput. At last, the simulation experiment is performed by using the single laser source being consisted of four LED chips with 1.5 MHz bandwidth. Experimental results show that the total throughput of the system increases with the increasing of the number of LED chips and the transmitted modulation system achieves a LED modulation with high data rate.