面向6G的欠采样相移键控可见光调制方案

Study and Implementation on UPSOOK Modulation Scheme of Visible Light Communication for 6G

可见光通信作为6G候选技术,可复用现有发光二极管、手机摄像头等实现绿色、安全通信。针对现有基于手机摄像头的可见光通信系统还存在相机帧率不稳定等因素限制通信性能的问题,提出了一种FEC-UPSOOK调制方案。首先设计了FEC-UPSOOK的系统帧结构,可消除收发端之间的相位误差;然后设计自适应阈值计算策略,以避免收发端之间距离和角度的差异对采样亮度值造成的影响;最后通过针对帧率抖动的前向纠错机制完成纠错,从而实现可靠的数据传输。为了验证该技术的有效性和可靠性,进一步构建了原型系统进行实测验证,结果表明FEC-UPSOOK调制方案可以有效提高系统的误码性能。

As a candidate 6G technology, visible light communication can reuse the existing LED and mobile camera to realize green and safe communication. However, the existing visible light communication system based on mobile camera still has the problem that the unstable camera frame rate and other factors limit the communication performance. To solve this problem, this paper proposes an undersampled phase shift on-off keying modulation scheme based on forward error correction(FEC-UPSOOK). Firstly, the frame structure of FEC-UPSOOK system is designed to eliminate the phase error between transceivers, and then an adaptive threshold calculation strategy is designed to avoid the impact of the distance and angle difference between transceivers on the sampling brightness value. Finally, the forward error correction mechanism for frame rate jitter is used to complete the error correction and realize reliable data transmission. In order to verify the effectiveness and reliability of the proposed technology, this paper further constructs a prototype system for experimental verification. Experimental results show that the FEC-UPSOOK modulation scheme can effectively improve the bit error performance of the system.