Signal Clipping at Transmitter and Receiver of O-OFDM for VLC under Optical Power Constraint  

作　　者：Liang Xia Xiaoqian Wang Zhiwen Sun Zhitian Cheng Jing Jin Yifei Yuan Guangyi Liu Tao Jiang Yuhong Huang 

机构地区：[1]Future Mobile Technology Lab,China Mobile Research Institute,Beijing 100053,China

出　　处：《China Communications》2022年第6期154-168,共15页中国通信（英文版）

摘　　要：Visible light communications(VLC)is considered as an effective supplement technology for next-generation(6G)communications due to its abundant spectrum,high power efficiency and easy deployment.Optical orthogonal frequency division multiplexing(O-OFDM)is a common technology to obtain further promotion.In this paper,two typical O-OFDM schemes direct current biased O-OFDM(DCO-OFDM)and asymmetrically clipped O-OFDM(ACO-OFDM)are analyzed in terms of signal clipping at both transmitter and receiver under the constraints of maximum optical power and non-negative optical power.And effective electrical SNR models after signal clipping are proposed and verified by link simulation.Then a noise cancellation scheme is proposed based on received signal clipping and is proved to bring a significant gain for ACO-OFDM.By system simulation,we find that under a certain optical power limitation,most users can achieve above 4 Gbps in indoor scenario when modulation bandwidth of the light emit diode(LED)or laser diode(LD)is 1 GHz.Therefore,it can be expected that the throughput could reach tens Gbps when the LED/LD modulation bandwidth is increased and multiple LEDs/LDs are deployed.

关 键 词：6G visible light communications optical orthogonal frequency division multiplexing CLIPPING bit error rate THROUGHPUT 

分 类 号：TN929.1[电子电信—通信与信息系统]