摘要
早先的无线通信传输主要以频谱效率为设计标准,在保证用户服务质量的同时,对有限的资源进行合理的分配从而得到较好的系统性能。关于频谱效率的研究主要是在系统发射功率有限的情况下并考虑用户公平性的同时,最大化系统的容量。而随着各种高速无线通信服务的应用越来越广泛,以及无处不在的无线接入使得能量的消耗越来越多。而对于电池容量有限的移动终端来说是一个较大的瓶颈。与此同时,无线网络的能量消耗的产生了越来越多的温室气体,并加重了运营费用。因此,以能量效率为设计准则的绿色通信越来越得到重视并成为未来无线网络设计的准则。本文提出了一种OFDM系统中基于能量效率的复杂度较低。本文首先提出了OFDM系统中能量效率的优化模型,接着采用经典的注水法,求出了最优的功率分配。通过仿真证明了该算法是最优的。
Traditionally, as wireless communication systems require better performance and quality-of-service （QoS） guarantee with limited resource availability, spectral efficiency （SE） oriented design becomes the main criterion. Previous works in SE oriented design focus on maximizing the total system＇s throughput under the transmit power constraint, and fairness is also considered. Recently, the widespread application of high-data-rate wireless services and requirement of ubiquitous access have triggered rapidly booming energy consumption, which is particularly a bottle-neck at mobile terminals due to limited battery capacity of the terminals and handsets. Meanwhile, the escalation of energy consumption in wireless networks leads to large amount of greenhouse gas emission and high operation expenditure. Green radio （GR） which emphasizes on energy efficiency （EE） besides SE has been proposed as an effective solution and becomes an inevitable trend for future wireless network design. Therefore, in addition to transmission rate, EE is also becoming important for the mobile communications. A low complexity algorithm based on water-filling algorithm is proposed in this paper. An OFDM system model is proposed in this paper. Then the classical water-filling algorithm is used to find the optimal power allocation. The simulation shows that the algorithm is optimal.
出处
《软件》
2012年第11期137-140,共4页
Software
关键词
绿色通信
资源分配
注水法
能量效率
Green Radio
Resource Allocation
Water-filling
Energy-efficient
