基于有限字母输入正交频分复用可见光与射频聚合系统的最优谱效研究  

Research on Optimal Spectral Efficiency of Orthogonal Frequency Division Multiplexing Visible Light Communication-Radio FrequencyAggregation System Based on Finite Alphabet Inputs

作　　者：马帅 鲁姗妹 何凌燕 盛海鸿 曹世昱 方啸 王洪梅 李世银 MA Shuai;LU Shanmei;HE Lingyan;SHENG Haihong;CAO Shiyu;FANG Xiao;WANG Hongmei;LI Shiyin(School of Information and Control Engineering,China University of Mining and Technology,Xuzhou 221116,China;National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China;Shaanxi Province Information and Communications Network and Security Laboratory,Xi’an University of Posts and Telecommunications,Xi’an 710121,China)

机构地区：[1]中国矿业大学信息与控制工程学院,徐州221116 [2]东南大学移动通信国家重点实验室,南京210096 [3]西安邮电大学陕西省信息通信网络及安全重点实验室,西安710121

出　　处：《电子与信息学报》2023年第6期2034-2044,共11页Journal of Electronics & Information Technology

基　　金：国家青年科学基金(62101557);东南大学移动通信国家重点实验室开放研究基金(2021D02)。

摘　　要：迄今为止,基于有限字母输入的正交频分复用(OFDM)可见光(VLC)和射频(RF)聚合系统的信息理论界仍然是未知的。基于这种情况,该文推导出OFDM VLC-RF聚合系统的无闭式形式的可达速率及其下界闭式表达式,并且研究了满足平均光功率和总电功率约束的基于可达速率及其下界的频谱效率(SE)最大化问题。该文利用互信息与最小均方误差(MMSE)之间的关系对速率偏导数进行了处理,提出双重注水算法解决谱效最大化问题。由于谱效的非闭式形式导致双重注水方案计算复杂度高,该文进一步研究具有闭式形式的谱效最大化问题,并使用内点法解决。仿真结果表明聚合系统相比于单个链路在通信性能上的优越性,以及基于可达速率下界的频谱效率可以作为基于可达速率的频谱效率的一个很好的低复杂度近似。So far,the information theory of Orthogonal Frequency Division Multiplexing(OFDM)Visible Light Communication(VLC)and Radio Frequency(RF)aggregation systems based on finite alphabet inputs is still unknown.Based on this situation,the achievable rate of unclosed expression and the lower bound with closed expression of OFDM VLC-RF aggregation system are derived,and the maximization of Spectral Efficiency(SE)based on achievable rate and its lower bound satisfying the constraints of average optical power and total electric power is studied.In this paper,the relationship between mutual information and Minimum Mean Square Error(MMSE)is used to deal with the rate partial derivative,and the double Water-filling algorithm is proposed to solve the maximization problem of spectral efficiency.Because the non-closed form of spectral efficiency leads to high computational complexity of the double Water-filling algorithm,this paper further studies the problem of spectral efficiency maximization with closed form and uses the interior point method to solve it.The simulation results show that the aggregation system has the advantages in communication performance compared with a single link,and the spectral efficiency based on the lower bound of achievable rate can be used as a good low complexity approximation of the spectral efficiency based on achievable rate.

关 键 词：可见光射频聚合系统 正交频分复用 频谱效率 

分 类 号：TN929[电子电信—通信与信息系统]