一种基于用户需求的OFDM系统资源分配算法

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 Yjn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。

Resource Allocation Based on Subscriber''s Demand in OFDM Systems

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.