北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2008, Vol. 31 ›› Issue (4): 112-116.doi: 10.13190/jbupt.200804.112.022

• 研究报告 • 上一篇    下一篇

多用户OFDM系统子载波比特分配算法

杨睿哲1,袁超伟1,丁义2,杨奎3   

  1. 1. 北京邮电大学 通信网络综合技术研究所, 北京 100876; 2. 德州学院 计算机科学与技术系, 德州 253023; 3. 中国网通 北京分公司, 北京 100032
  • 收稿日期:2007-12-13 修回日期:1900-01-01 出版日期:2008-08-30 发布日期:2008-08-30
  • 通讯作者: 杨睿哲

Subcarrier-Bit Allocation Algorithm in Multiuser OFDM System

YANG Rui-zhe1,YUAN Chao-wei1,DING Yi2,YANG Kui3   

  1. 1. Institute of Communication Network Integrated Technology, Beijing University of Posts and Telecommunications, Beijing 100876,China; 2. Department of Computer Science and Technology, Dezhou University, Dezhou 253023,China; 3. Beijing Branch, China Netcom, Beijing 100032,China
  • Received:2007-12-13 Revised:1900-01-01 Online:2008-08-30 Published:2008-08-30
  • Contact: YANG Rui-zhe

摘要:

针对多用户正交频分复用技术(OFDM)系统功率优化问题,提出一种高效的子载波、比特分配算法。该算法基于最小化-最大者(Min-Max)的原则逐个分配子载波使用户功率递减,采用注水原理分配比特使用户功率最小化,最后使用贪婪算法将分配比特取整,以实现系统功率最小化的目标。理论分析和仿真结果表明,提出的算法有效降低系统发射功率,同时降低了运算的复杂度。

关键词: 多用户正交频分复用, 子载波、比特分配, 最小化-最大者

Abstract:

A scheme of subcarrier-bit allocation is proposed for the power optimization in multiuser orthogonal frequency division multiplexing(OFDM) system. The scheme allocates the subcarriers to reduce the power of users with the principle of Min-Max, allocates the bit by water-filling to minimize the power of users. Finally the bit is rounded by greedy algorithm to obtain the minimized total transmit power of the system. Theoretical analysis and simulation results show that the performance is improved but with low complexity.

Key words: multiuser orthogonal frequency division multiplexing, subcarrier-bit allocation, min-max

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