电信科学 ›› 2015, Vol. 31 ›› Issue (12): 58-63.doi: 10.11959/j.issn.1000-0801.2015296

• 研究与开发 • 上一篇    下一篇

优化公平性的多用户OFDM系统下行链路资源分配算法

汤丽梅1,曹海燕1,李君2,谢时場1   

  1. 1 杭州电子科技大学通信工程学院 杭州310018
    2 中国计量学院信息工程学院 杭州310018
  • 出版日期:2015-12-20 发布日期:2017-03-27
  • 基金资助:
    国家自然科学基金资助项目;浙江省自然科学基金资助项目

Resource Allocation Algorithm for the Downlink of Multi-User OFDM System with Optimized Fairness

Limei Tang1,Haiyan Cao1,Jun Li2,Shiyi Xie1   

  1. 1 College of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
    2 College of Information Engineering, China Jiliang University, Hangzhou 310018, China
  • Online:2015-12-20 Published:2017-03-27
  • Supported by:
    The National Natural Science Foundation of China;The National Natural Science Foundation of Zhejiang

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摘要：

研究了优化公平性的多用户OFDM系统下行链路的资源分配算法，根据系统各用户的业务需求，在保证用户所得数据速率满足一定比例以及系统总功率限制的前提下，提高系统总数据速率。首先，根据公平性原则进行用户的子载波分配，子载波功率分配使用注水算法；子载波分配完成后，利用贪婪功率分配算法，以最大化用户数据速率和提高功率利用率为目标，对各用户内部子载波功率和比特数进行再分配。仿真结果表明，相比参考文献[10]的算法，该算法在提高系统总速率的同时，更好地保证了用户数据速率的公平性；相比参考文献[12]的算法，该算法虽然牺牲了一定的系统总速率，但能提供更高的用户数据速率公平性。

关键词: OFDM, 公平性, 数据速率, 子载波, 功率

Abstract:

A resource allocation algorithm for the downlink of multi-user OFDM system with optimized fairness was studied. Firstly, assign the subcarriers to users with the constraint on proportional fairness and the water-filling algorithm was used in this process for the power allocation of each subcarrier. Then update the bits and power for each subcarrier of all the users using greedy power allocation to achieve higher data rates and power efficiency. Simulation results show that the proposed algorithm improves the capacity of the system while ensuring the performance of fairness better compared with the algorithm in[10]. To[12], the fairness is considerable improved with a little loss of capacity.

Key words: OFDM, fairness, data rate, subcarrier, power

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