摘要
针对可见光通信(VLC)系统中发光二极管(LED)有限的调制带宽,提出了一种多带无载波幅度相位(m CAP)调制与成对编码(PWC)结合的混合方案。该方案中PWC技术将高频子带与低频子带进行配对和交织来有效克服信噪比(SNR)不平衡问题。通过实验验证,给出了在子带数分别为2、3、4和5的情况下PWC编码对应的最佳旋转角度,并分析了在指定带宽下所能传输的最大调制阶数。实验结果表明:相比于传统的m CAP-VLC系统,基于PWC的m CAP-VLC系统可以传输更高调制阶数。
Aiming at the limited modulation bandwidth of light emitting diode(LED) in visible light communication(VLC)system,a hybrid scheme combining multiband carrierless amplitude-phase(m CAP) modulation with pairwise coding(PWC) is proposed.In this scheme,PWC technology pairs and interleaves high-frequency sub-bands with low-frequency sub-bands to effectively overcome the signal to noise ratio(SNR) imbalance problem.Validated by the experiment,the optimal rotation angle corresponding to PWC coding is given when the number of subbands is 2,3,4 and 5 respectively,and the maximum modulation order that can be transmitted under the specified bandwidth is analyzed.The experimental results show that compared with the traditional m CAP-VLC system,the m CAP-VLC system based on PWC can transmit higher modulation order.
作者
聂云桂
陈晨
简鑫
付澍
刘敏
NIE Yungui;CHEN Chen;JIAN Xin;FU Shu;LIU Min(School of Microelectronics and Communication Engineering,Chongqing University,Chongqing 400030,China)
出处
《光通信技术》
2022年第2期41-44,共4页
Optical Communication Technology
基金
国家自然科学基金资助项目(No.61901065)资助。
关键词
可见光通信
多带无载波幅度相位调制
成对编码
发光二极管
信噪比
visible light communication
multiband carrierless amplitude-phase modulation
paired encoding
light emitting diodes
signal to noise ratio
