VLC网络中兼具功率与时隙分配的自适应干扰管理机制  

Adaptive Interference Management Scheme with Power and Time Slot Allocation for VLC Networks

作　　者：高龙龙 谢显中[1] 卢华兵 Gao Longlong;Xie Xianzhong;Lu Huabing(College of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Computer Network and Communication Chongqing Key Laboratory,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院/计算机网络与通信重庆市重点实验室,重庆400065

出　　处：《信号处理》2020年第2期177-187,共11页Journal of Signal Processing

基　　金：国家自然科学基金(61601070);重庆市教委科学技术研究重点项目(KJZD-K201800603);重庆市基础与前沿研究计划项目(cstc2018jcyjAX0432);重庆市研究生创新教育计划(CYB17131,CYS17223,BYJS2017003)。

摘　　要：为了更好解决目前可见光通信(visible light communication,VLC)中干扰管理方案存在的动态优化问题,提出了一种兼具优化功率分配与时隙分配的自适应干扰管理机制。首先,在每个时隙依据用户的位置建立每个用户的接入点(access point,AP)协作集,寻找所有由最多数量互不干扰用户组成的极大独立集,以此自适应地避免同频干扰;在每个时隙为每个极大独立集采用改进的线性注水功率分配算法为信道自适应地分配发送功率,以此优化每个极大独立集的用户和速率;基于用户和速率、速率公平性及时延公平性的归一化优先因子,选出具有最大优先因子的候选极大独立集,其中包含的用户在该时隙被调度。通过仿真且与代表性文献中的算法比较可得,本文提出的自适应干扰管理与优化资源分配方案在网络频谱利用率、能效、用户速率公平性与时延公平性方面具有明显优势。In order to better solve the existing problems of dynamic optimal interference management schemes for visible light communication(VLC) networks,an interference management scheme with both optimal power allocation and time slot allocation is proposed.At each time slot,firstly,access point(AP) coordinated sets for each user are established by the users’ location to eliminate interference,and all maximal independent sets including the largest number of non-interfered users are found.According to the difference of channel gain,for each maximal independent set the power is allocated to the channels by improved linear water-filling power allocation algorithm,which optimizes sum rate of each maximal independent set.Furthermore,considering the normalized priority factors involving sum rate,rate fairness and delay fairness,and the candidate maximal independent set with the maximum sum of priority factors is selected,in which the users involved are scheduled at the timeslot.By simulation and comparison with the algorithms in representative literatures,the proposed interference management and resource allocation scheme have obvious advantages with spectrum utilization,energy efficiency,rate fairness and delay fairness.

关 键 词：可见光通信 自适应干扰管理 功率与时隙分配 极大独立集 优先因子 

分 类 号：TN929.1[电子电信—通信与信息系统]