自适应功率分配可见光MIMO信道容量研究  

Research on MIMO channel capacity for adaptive power allocation visible light

作　　者：杨博瑞 赵黎[1] 芦颖 周宇 YANG Borui;ZHAO Li;LU Ying;ZHOU Yu(School of Electronic Information Engineering,Xi'an Technology University,Xi'an 710021,China)

机构地区：[1]西安工业大学电子信息工程学院,陕西西安710021

出　　处：《应用光学》2020年第3期626-630,共5页Journal of Applied Optics

基　　金：国家自然科学基金(61271362);陕西省科技厅一般项目-工业领域(2020GY-054);西安市科技计划项目(2017075CG/RC038(XAGY001))。

摘　　要：可见光通信(VLC)系统通常采用多阵列光源布局方式来兼顾照明与通信双重功能,因此需要使用多输入多输出(MIMO)技术进行多天线协同传输来实现高速率通信。然而传统MIMO系统中采用平均功率分配来实现空间复用,无法充分体现MIMO多天线协调传输的优势。根据每组收发天线信道状态的差异,设计了一种低计算复杂度的快速迭代注水算法,可实现依据信道特征自适应的分配信息,从而提高系统的信道容量。仿真结果表明:在相同信噪比情况下注水算法自适应功率分配系统比等功率分配系统的信道容量提高了1.25 bit/Hz左右。The multi-array light source layout is usually adopted by the visible light communication(VLC)system to give consideration to both illumination and communication functions.Therefore,the MIMO technology is required for the multi-antenna cooperative transmission to achieve the high-rate communication.However,the average power allocation is used to achieve the spatial multiplexing in the traditional MIMO system,which cannot fully reflect the advantages of the MIMO multi-antenna coordinated transmission.Based on the differences for the state of receiving and sending antenna channel in each group,a fast iterative waterfilling algorithm with low computational complexity was designed,which could realize the allocation information on the basis of channel feature adaption and improve the channel capacity of the system.Finally,the simulation results show that under the same SNR,the channel capacity of the adaptive power allocation system with water-filling algorithm is about 1.25 bit/HZ higher than that of the equal power allocation system.

关 键 词：可见光通信 多输入/多输出 信道状态 注水算法 

分 类 号：TN929.1[电子电信—通信与信息系统]