一种基于用户需求的OFDM系统资源分配算法  

Resource Allocation Based on Subscriber's Demand in OFDM Systems

作　　者：杨维君[1] 罗汉文[1] 

机构地区：[1]上海交通大学电子工程系,上海200030

出　　处：《电讯技术》2006年第5期40-44,共5页Telecommunication Engineering

基　　金：国家自然科学基金重点项目(60332030);国家自然科学基金资助项目(60272079);国家高技术研究发展计划(863计划)项目(2003AA12310)

摘　　要：提出了一种新的基于OFDM多用户通信系统的资源分配算法。该算法在总功率限制和用户数据率要求下,通过以下两步实现子载波、比特和功率的动态分配:第一步,基于用户的平均信道增益和数据率要求进行资源初分配(每个用户分配多少个子载波、功率);第二步,对步骤1中的结果进行调整,最终决定每个用户分配到的子载波、功率以及比特载入方式。相比于Hujun Y in等人提出的另一种基于用户需求的算法,新算法的基站发射功率略有增加,但复杂度大为降低,在实际运用中更有利用价值。A novel - loading algorithm is presented for OFDM - based multi - user communication system to maximize the total system throughput while satisfying the total power and users＇ rate constraints. The new scheme determines the sub - carrier, bit, and power allocation by two steps, step 1, preliminary resource allocation （how much power and how many sub- carriers for each user） based on users＇ average channel gains and their rate requirements; and step 2, adjusting the result of step 1, determining the sub - carrier, power and bit loading for each user. Compared with another user - requirement based algorithm proposed by Hujun Yin, et al, although the novel algorithm uses a bit more base station power, its complexity is much lower, which is important in practical use.

关 键 词：OFDM 资源分配 自适应编码调制 

分 类 号：TN911[电子电信—通信与信息系统]