基于删除Polar码的可调光可见光通信方案  

Dimmable Visible Light Communication Scheme Based on Punctured Polar Codes

作　　者：李琳[1] 王超[1] 郭家宁 吴奇[1] 张剑[1] Li Lin;Wang Chao;Guo Jianing;Wu Qi;Zhang Jian(Strategic Support Force Information Engineering University,Zhengzhou 450001,Henan,China)

机构地区：[1]战略支援部队信息工程大学,河南郑州450001

出　　处：《光学学报》2022年第16期58-68,共11页Acta Optica Sinica

基　　金：国家自然科学基金(62071489,61901524);国家重点研发计划(2018YFB1801903)。

摘　　要：基于IEEE 802.15.7标准中的OOK(On-Off Keying)调光模式,提出一种基于删除polar码的调光方案,该方案在获取尽可能高质量的可见光通信性能的同时,还可以支持用户的调光需求并抑制闪烁对人眼带来的不适。利用基于列贪婪删除算法的删除polar码方案及CRC(Cyclic Redundancy Check)校验支持的SCL(Successive Cancellation List)译码方法,本方案可以获得优越的误码性能;利用置位式伪随机扰码对删除polar码加扰,以获得01平衡、游程长度受限的数据序列,使灯光变化在最大闪烁时间段(MFTP)内,避免人眼感知到不适的灯光闪烁;利用插入补偿符号(CS)的方式使平均光强度符合用户调光需求。经仿真比对分析,发现该方案能支持用户任意调光率(0~1)需求。在调光率为0.5时,与其他使用前向纠错(FEC)码进行调光的方案相比,本文所提方案在码率为0.5的情况下传输效率有1.25倍以上的提高;在调光率为0.2、误比特率为10^(-4)时,本文方案采用码率为0.5的polar码时能提供0.5~1.7 dB的信噪比增益。Based on the OOK(On-Off Keying)dimming mode in IEEE 802.15.7 standard,this paper proposes a dimming scheme based on punctured polar code,which can not only obtain better communication performance,but also support the user's dimming requirements and suppress the discomfort caused by flicker to human eyes.Using punctured polar code scheme based on column greedy deletion algorithm and CRC(Cyclic Redundancy Check)aided SCL(Successive Cancellation List)decoding method,this scheme can obtain superior bit error performance.The pseudorandom scrambling code is used to scramble the punctured polar codes to obtain a 01 balancing data sequence with limited run length,so that the light intensity changes within the maximum flickering time period(MFTP),so as to avoid the perception of uncomfortable light flicker to the human eyes.The average light intensity can be obtained by inserting the compensation symbol,which meets the user's requirement of dimming.The simulation results show that the scheme can support any dimming rate(0-1).Compared with other schemes using forward error correction(FEC)code for dimming,the scheme proposed in this paper improves the transmission efficiency by more than 1.25 times when the code rate is 0.5;the scheme can provide a gain of 0.5-1.7 dB at the dimming rate of 0.2 and bit error rate of 10^(-4) when using a polar with code rate of 0.5.

关 键 词：光通信 可见光通信 调光方案 删除polar码 前向纠错码 

分 类 号：O436[机械工程—光学工程]