可见光通信DCO-OFDM系统资源分配算法研究  

Research on Resource Allocation Algorithm of Visible Light Communication DCO-OFDM System

作　　者：洪文昕[1] 李天屿 陈建飞 HONG Wen-xin;LI Tian-yu;CHEN Jian-fei(College of Electronic and Optical Engineering&College of Microelectronics,Nanjing 210023,China;College of Telecommunications Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学电子与光学工程,微电子学院,南京210023 [2]南京邮电大学通信与信息工程学院,南京210023

出　　处：《光通信研究》2021年第6期19-22,44,共5页Study on Optical Communications

基　　金：国家自然科学基金资助项目(61601237);江苏省自然科学基金资助项目(SJ216039);江苏省高校自然科学研究面上资助项目(16KJB420001);南京邮电大学校级科研资助项目(XK1060918088)。

摘　　要：针对室内可见光通信(VLC)直流偏置光正交频分复用(DCO-OFDM)系统存在的低信道利用率问题,文章对该系统的信道资源和比特资源进行了优化分配研究。首先介绍了DCO-OFDM系统的信号发射端模型和系统的信道利用率计算,并按照两步算法的思路依次分析了信道资源分配和比特资源分配问题,进而提出了自适应动态资源分配算法,该算法能够根据信道幅度频率响应来灵活分配子信道,并为各信道自适应选择满足服务质量要求的最高阶正交振幅调制(QAM)调制方式。仿真结果表明,相比于传统固定分配算法,该自适应资源分配算法可显著提升室内VLC DCO-OFDM系统的信道利用率。In view of the problem of low channel utilization in the Direct Current-biased Optical Orthogonal Frequency Division Multiplexing(DCO-OFDM) system for indoor Visible Light Communication(VLC), the channel and bit resources of the system are optimally allocated. This paper first introduces the signal transmitter model of the DCO-OFDM system and the calculation of the channel utilization of the system. Then we analyze the problem of channel resource allocation and bit resource allocation in sequence according to the two-step algorithm. Finally, we propose an adaptive dynamic resource allocation algorithm. The algorithm can flexibly allocate sub-channels according to the channel amplitude and frequency response, and adaptively select the highest order Quadrature Amplitude Modulation(QAM) modulation method for each channel to meet service quality requirements. The results show that, compared with the traditional fixed allocation algorithm, this adaptive resource allocation algorithm can significantly improve the channel utilization of indoor VLC DCO-OFDM system.

关 键 词：室内可见光通信 直流偏置光正交频分复用系统 自适应动态资源分配算法 信道利用率 

分 类 号：TN929.1[电子电信—通信与信息系统]