VLC网络中兼顾QoS和公平性的协作子载波与功率分配算法

针对目前可见光通信(visible light communication,VLC)中干扰管理算法存在的问题,提出了一种兼顾服务质量(quality of service,QoS)和公平性的协作子载波和功率分配算法.将终端公平度与QoS的乘积作为优先级因子,每轮优先级因子最高的终端获得协作接入点(access point,AP)分配的子载波,并且采用基于图论的advanced-BFM(advanced-backward-forward marking)算法进行协作子载波分配;为了充分利用每个AP的发送功率,避免由于终端所处位置引起的信道质量差异影响,提出了基于改进注水思想的3步优化功率分配算法,进一步最大程度提高终端QoS与公平性,最大化和速率.通过模拟仿真可得,与代表性文献比较,提出的干扰管理与功率分配方案明显提升了网络公平性、平均QoS、频谱效率和能效.

Coordinated subcarrier and power allocation algorithms considering both QoS and fairness for VLC networks

The paper aims at the existing problems of interference management algorithms in visible light communication (VLC). The coordinated subcarrier and power allocation algorithm is proposed, which not only eliminates interference between terminals, but also guarantees both quality of service (QoS) and fairness. Taking fairness and QoS as priority factor, the terminal with the highest priority factor in each round obtains the subcarriers allocated by the coordinated AP, and uses the advanced-backward-forward marking(advanced-BFM) algorithm based on graph theory to allocate coordinated subcarriers. In order to make full use of the transmission power of each AP and avoid the influence of channel quality difference caused by the location of the terminal, a three-step optimal power allocation algorithm based on the improved water-filling idea is proposed to further improve both QoS and fairness, and maximize the sum rate. The simulation results show that the proposed interference management and power allocation scheme significantly improves fairness, average QoS, spectrum efficiency and energy efficiency of the network compared with the representative literature.