为了提高可见光通信系统的数据传输率，设计并实现了两种基于空间调制技术的可见光通信方案。发送端采用空移键控（SSK）分别与脉冲位置调制（PPM）和脉冲宽度调制（PWM）相结合，形成两种复合调制方式即空间脉冲位置调制(SPPM)和空间脉冲宽度调制(SPWM)来传输数据。复合调制充分利用了空间和信号二维资源，有效地提高了系统频带利用率。接收端采用电流反馈电路和电压放大电路来提高接收电平峰值的动态范围，利用C8051对光脉冲进行解调。基于单片机实现了4发1收的实验系统，测试结果验证了方案的有效性。

In order to improve the data transmission rate of Visible Light Communication (VLC) system, two kinds of VLC schemes based on space modulation technology are designed and implemented. The transmit end uses Space-Shift Keying (SSK) combined with Pulse Position Modulation (PPM) and Pulse Width Modulation (PWM) respectively to form two complex modulation schemes and transfer data, namely Space Pulse Position Modulation (SPPM) and Space Pulse Width Modulation (SPWM). As the composite modulation makes full use of space and signal two-dimensional resources, the system band utilization is effectively improved. The current feedback circuit and the voltage amplifier circuit are adopted to improve the dynamic range of the peak level of the receiving level, and the optical pulse is demodulated by the single-chip computer C8051. Based on the hardware and software platform developed in this paper, a four-transmit and one-receive experimental system is obtained. The performance and effectiveness of the system are also tested and verified.