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应用科学学报 ›› 2012, Vol. 30 ›› Issue (1): 7-13.doi: 10.3969/j.issn.0255-8297.2012.01.002

• 通信工程 • 上一篇    下一篇

放大-转发OFDMA中继系统多业务资源分配方案

万庆涛1;2， 马冠一1   

  1. 1. 中国科学院国家天文台，北京100012
    2. 中国科学院研究生院，北京100049
  • 收稿日期:2011-01-30 修回日期:2011-08-25 出版日期:2012-02-09 发布日期:2012-01-30
  • 通信作者: 万庆涛，博士生，研究方向：宽带无线通信系统资源分配与调度，E-mail: qtwan@nao.cas.cn；
  • 作者简介:作者简介：万庆涛，博士生，研究方向：宽带无线通信系统资源分配与调度，E-mail: qtwan@nao.cas.cn；马冠一，研究员，博导，研究方向：宽带无线通信、卫星通信与导航，E-mail: guanyima@nao.cas.cn
  • 基金资助:

    国家“973”重点基础研究发展计划基金(No. 2007CB815504)资助

Resource Allocation Scheme for Heterogeneous Services in Amplify-and-Forward OFDM Relay System

WAN Qing-tao1;2, MA Guan-yi1   

  1. 1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2011-01-30 Revised:2011-08-25 Online:2012-02-09 Published:2012-01-30

PDF

1233

被引次数

7

摘要：

针对独立功率限制、放大–转发OFDMA中继系统的多业务资源分配问题，提出一种在满足实时用户要求前提下，非实时用户数据速率最大化的资源分配方案. 根据业务的不同将问题分解为实时和非实时用户的资源分配两个子问题. 对于实时用户的资源分配，利用Lagrange方法计算. 对于非实时用户的资源分配，每个子载波分配给信道条件最好的用户，针对功率分配提出两步功率分配方法. 首先按照总功率约束进行初始功率分配，然后对各子载波的功率进行调整以满足独立功率约束. 对于子载波分配提出一种低复杂度的子载波集合分配算法. 仿真结果表明，该方案在满足多业务用户要求的同时使系统性能得到优化，且计算复杂度低.

关键词: 正交频分多址, 中继系统, 资源分配, 放大-转发, 多业务

Abstract:

This paper studies a resource allocation problem for heterogeneous services in amplify-and-forward
OFDM relay system under separate power constraints. A resource allocation scheme is proposed to maximize
the data rate of non-realtime service (NRTS) users while satisfying the requirement of realtime service (RTS)
users. The problem is decomposed into two sub-problems: resource allocation for RTS and NRTS. The problem
of RTS is solved with the Lagrangian method, while for NRTS, each subcarrier is allocated to the user with the
best channel gain, and a two-step method is proposed for power allocation. First, the initial power allocation
is done under the total power constraint. The subcarrier power is adjusted to satisfy the separate power
constraints. A low complexity algorithm is proposed for subcarrier set allocation. Simulation results show that
the proposed scheme optimizes the system performance with low complexity while satisfying the requirements
of heterogeneous services users.

Key words: OFDMA, relay system, resource allocation, amplify-and-forward, heterogeneous services

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