摘要
在有限字符输入的情况下,正交频分复用(orthogonal frequency division multiplexing,OFDM)可见光通信(visible light communications,VLC)和射频(radio frequency,RF)聚合系统的信息传输速率极限仍然是未知的。文章基于互信息公式推导出OFDM VLC-RF聚合系统信息传输速率的无闭式表达式及其下界闭式表达式,并且基于这两种通信速率表达式研究系统能效最大化问题,具体涉及满足频谱效率(spectrum efficiency,SE)门限、总电功率和平均光功率约束的能效最大化问题;同时,使用Dinkelbach-type算法将能量效率最大化非凸问题转变为一系列凸的子问题,再利用内点法求解凸的子问题。仿真结果表明,在SE门限增加时,系统能效先保持恒定不变然后下降,且基于信息传输速率下界的能效可以作为基于信息传输速率能效的低复杂度近似。该研究为实际通信中的聚合系统研究提供了新的方向。
In the case of finite alphabet inputs, information transmission rate limit of orthogonal frequency division multiplexing(OFDM) visible light communications(VLC) and radio frequency(RF) aggregation systems is still unknown.Therefore, the unclosed expression information transmission rate and its lower bound with closed expression of OFDM VLC-RF aggregation system are derived based on mutual imformation function, and the problem of energy efficiency maximization is studied based on the two communication rates. Specifically, the energy efficiency maximization problem satisfying the spectrum efficiency(SE) threshold, total electric power and average optical power constraints is studied. At the same time, the Dinkelbach-type algorithm is used to transform the energy efficiency maximization nonconvex problem into a series of convex sub-problems, and then the interior point algorithm is used to solve it. Simulation results show that when SE threshold increases, energy efficiency first remains constant and then decreases, and energy efficiency based on the lower bound of information transmission rate can be used as a low complexity approximation of energy efficiency based on information transmission rate. The finite alphabet inputs VLC-RF aggregation system studied in this paper provides a new direction for practical communication aggregation system research.
作者
鲁姗妹
方啸
何凌燕
李兵
马帅
李世银
LU Shanmei;FANG Xiao;HE Lingyan;LI Bing;MAShuai;LI Shiyin(School of Information and Control Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;National Mobile Communications Research Laboratory,Southeast University,Nanjing,Jiangsu 210096,China;Shaanxi Province Information and Communications Network and Security Laboratory,Xi'an University of Posts and Telecommunications,Xi'an,Shaanxi 710121,China)
出处
《控制与信息技术》
2022年第4期71-79,共9页
CONTROL AND 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)。
关键词
可见光通信-射频聚合系统
正交频分复用
能量效率
信息传输速率
VLC-RF aggregation system
orthogonal frequency division multiplexing
energy efficiency
information transmission rate
