中国邮电高校学报(英文)

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Resource allocation in downlink OFDMA distributed multipoint systems with incoherent and coherent transmitters

王坦1,王莹2,张平2   

  1. 1. Wireless Technology Innovation Institute, Key Laboratory of Universal Wireless Communication, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China 2. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • 收稿日期:2010-12-01 修回日期:2011-02-16 出版日期:2011-06-30 发布日期:2011-06-13
  • 通讯作者: 王坦 E-mail:wangtan0281@gmail.com
  • 基金资助:

    国家工业与信息化部重大专项:IMT-Advanced关键技术仿真平台;国家十一五863计划频谱资源共享无线通信系统重点项目课题2:频谱感知与干扰评估新技术研究;国家自然科学基金面上项目:异构IP网络中基于多目标决策理论的资源优化技术研究;北京市科技新星计划(B类):下一代MIMO中继网络中的无线资源管理研究;教育部新世纪优秀人才支持计划:IMT-Advanced系统主动式多小区多用户干扰协调技术研究

Resource allocation in downlink OFDMA distributed multipoint systems with incoherent and coherent transmitters

  1. 1. Wireless Technology Innovation Institute, Key Laboratory of Universal Wireless Communication, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China 2. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2010-12-01 Revised:2011-02-16 Online:2011-06-30 Published:2011-06-13
  • Contact: Tan Wang E-mail:wangtan0281@gmail.com

摘要:

Distributed multipoint systems (DMS) are important and timely for the move to future broadband wireless communication systems. Traditional studies on DMS have mainly focused on the issues with the spatial division multiple access such as precoding techniques, which only consider a narrowband case. This paper addresses the downlink radio resource management of the orthogonal frequency division multiple access DMS (OFDMA-DMS), including power allocation between users or subcarriers, and distributed antenna selection. Signal models with incoherent and coherent transmitters are built. To maximize the system throughput, for the incoherent transmitter case, a strategy based on the iterative water-filling power allocation is proposed to approach the optimality. As for the coherent case, where coherent additions of the signal could occur at the users, the problem is transformed into an integer programming which is solvable. Numerical results show that the gain from the coherent transmitter is promising. And to achieve a near-optimal solution, only part of the DA ports will be used, which have better channel conditions.

关键词:

DMS, orthogonal frequency division multiple access (OFDMA), power allocation, antenna port selection

Abstract:

Distributed multipoint systems (DMS) are important and timely for the move to future broadband wireless communication systems. Traditional studies on DMS have mainly focused on the issues with the spatial division multiple access such as precoding techniques, which only consider a narrowband case. This paper addresses the downlink radio resource management of the orthogonal frequency division multiple access DMS (OFDMA-DMS), including power allocation between users or subcarriers, and distributed antenna selection. Signal models with incoherent and coherent transmitters are built. To maximize the system throughput, for the incoherent transmitter case, a strategy based on the iterative water-filling power allocation is proposed to approach the optimality. As for the coherent case, where coherent additions of the signal could occur at the users, the problem is transformed into an integer programming which is solvable. Numerical results show that the gain from the coherent transmitter is promising. And to achieve a near-optimal solution, only part of the DA ports will be used, which have better channel conditions.

Key words:

DMS, orthogonal frequency division multiple access (OFDMA), power allocation, antenna port selection