电子学报 ›› 2013, Vol. 41 ›› Issue (2): 335-339.DOI: 10.3969/j.issn.0372-2112.2013.02.020

• 学术论文 • 上一篇    下一篇

具有时延QoS保证的OFDM中继系统子载波配对与功率分配算法

黄高飞1,2, 罗丽平3, 张广驰4, 唐冬1, 秦家银2   

  1. 1. 广州大学机械与电气工程学院,广东广州 510006;
    2. 中山大学信息科学与技术学院,广东广州 510275;
    3. 广西民族大学信息科学与工程学院,广西南宁 530006;
    4. 广东工业大学信息工程学院,广东广州 510006
  • 收稿日期:2012-04-26 修回日期:2012-07-25 出版日期:2013-02-25 发布日期:2013-02-25
  • 作者简介:黄高飞 男,1978年出生于广东信宜,中山大学博士生,广州大学教师,主要研究方向为无线通信系统资源分配技术. E-mail:huanggaofei@126.com罗丽平 女,1980 年出生于湖北麻城,中山大学博士,广西民族大学教师,主要研究方向为无线通信,认知无线电. E-mail:lping.luo@gmail.com
  • 基金资助:
    国家自然科学基金(No.61102070,No.61173148);广东省教育部产学研结合项目(No.2011B090400581);广州市科技计划(No.12C42051578,No.11A11060133);广东省自然科学基金(No.S2011040004135);广西省自然科学基金(No.2012GXNSFBA053162)

Subcarrier Pairing and Power Allocation Algorithm for OFDM Relay Systems with Delay QoS Guarantees

HUANG Gao-fei1,2, LUO Li-ping3, ZHANG Guang-chi4, TANG Dong1, QIN Jia-yin2   

  1. 1. School of Mechanical and Electronic Engineering, Guangzhou University, Guangzhou, Guangdong 510006, China;
    2. School of Information Science and Technology, Sun Yat-sen University, Guangzhou, Guangdong 510275, China;
    3. School of Information Science and Engineering, Guangxi University for Nationalities, Nanning, Guangxi 530006, China;
    4. School of Information Science, Guangdong University of Technology, Guangzhou, Guangdong 510006, China
  • Received:2012-04-26 Revised:2012-07-25 Online:2013-02-25 Published:2013-02-25

摘要: 本文研究具有直接通信链路的OFDM解码转发(Decode-and-Forward,DF)中继系统的子载波配对与功率分配算法,目标是在满足业务时延QoS要求的前提下最大化系统容量.利用有效容量模型,首先把OFDM DF中继系统的子载波配对与功率分配问题形成为混合整数规划问题,然后把其转化为连续松弛凸规划问题,利用凸优化方法得到原问题的最优解,从而提出了一种联合最优的子载波配对与功率分配迭代算法.理论推导结果和仿真结果表明,最优子载波配对与功率分配不仅取决于子载波的信道增益,还取决于业务的时延QoS要求.与已有算法相比,本文算法获得的有效容量最大.

关键词: 正交频分复用, 无线中继, 服务质量, 子载波配对与功率分配, 有效容量, 凸优化

Abstract: In this paper,the subcarrier pairing and power allocation algorithm for OFDM decode-and-forward (DF) relay systems with direct link is investigated.The goal is to maximize the system throughput while meeting the delay QoS requirements of transmission services.Firstly,by integrating the effective capacity model,the subcarrier pairing and power allocation problem is formulated as a mixed integer programming problem.Then,the problem is transformed into a continuous relaxed convex problem.By using the convex optimization theory,the optimal solution of the primal problem is obtained,and an alternative algorithm to achieve jointly optimal subcarrier pairing and power allocation is proposed.The derived analytical and simulation results show that both the optimal subcarrier pairing and power allocation depend on not only the channel quality of the subcarriers but also the delay QoS requirements of the service.Compared with the existing algorithms,our proposed algorithm achieves the highest effective capacity.

Key words: orthogonal frequency-division multiplexing (OFDM), wireless relay, quality of service (QoS), subcarrier pairing and power allocation, effective capacity, convex optimization

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