| 引用本文: | 王丽洁,唐 艺,黄勤飞,等.协同OFDM放大前传空时编码系统中的功率分配.[J].国防科技大学学报,2012,34(3):142-147.[点击复制] |
| WANG Lijie,TANG Yi,HUANG Qinfei,et al.The power allocation of cooperative OFDM-based amplify-and-forward STBC system[J].Journal of National University of Defense Technology,2012,34(3):142-147[点击复制] |
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| 协同OFDM放大前传空时编码系统中的功率分配 |
| 王丽洁1, 唐 艺1, 黄勤飞2, 魏急波1 |
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(1.国防科技大学 电子科学与工程学院，湖南 长沙 410073;2.中国电子系统设备工程总公司，北京 100141)
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| 摘要: |
| 针对由源节点和单个中继节点形成的协同正交频分复用(OFDM) Alamouti空时块码系统，分析了放大前传(AF)模式下的系统容量，给出了解析表达式。考虑节点功率独立约束的应用场景，提出了分步迭代的功率分配算法(SIPAA)来提高系统容量。该算法的核心思想是在每次迭代中，分步对源和中继节点分别进行注水功率分配，注水功率分配前对目标函数进行线性化处理，功率分配后对功率分配向量进行线性化处理以降低算法复杂度。仿真结果表明，相对于等功率分配算法，所提出的分步迭代功率分配算法可以显著提高系统容量，且仅需很少几次迭代运算就可以完成功率分配。 |
| 关键词: 正交频分复用 空时块码 协同传输 放大前传 注水功率分配 |
| DOI： |
| 投稿日期：2011-07-01 |
| 基金项目:国家自然科学基金资助项目（61002032, 60903206）；教育部高等学校博士点专项科研基金资助项目（2009430711004） |
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| The power allocation of cooperative OFDM-based amplify-and-forward STBC system |
| WANG Lijie1, TANG Yi1, HUANG Qinfei2, WEI Jibo1 |
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(1.College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China;2.China Electronic System Engineering Company, Beijing 100141, China)
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| Abstract: |
| A cooperative orthogonal frequency division multiplexing (OFDM) system with a source and a non-regenerative relay transmitting according to Alamouti’s STBC is considered. The capacity of the system is analyzed and the analytical expression is presented. To improve the capacity of the individual power constrained system, a power allocation algorithm named as the Stepwise Iterative Power Allocation Algorithm (SIPAA) is proposed. The basic principle of SIPAA is that the water filling power allocation is implemented stepwise for both the source and the relay within iterations. To reduce the complexity of SIPAA, the object function is linearly processed before the water-filling power allocation, and the power vector is also linearly processed after the water-filling power allocation. It is confirmed by the simulation results that a significant system capacity improvement can be achieved by the proposed algorithm, compared with conventional equal power allocation algorithm. Moreover, the power allocation can be completed within a few iterations. |
| Keywords: orthogonal frequency division multiplexing space-time block coding cooperative transmission amplify-and-forward water-filling power allocation |
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