Power Allocation for Relay-Assisted TDD Cellular System with Dynamic Frequency Reuse

Power Allocation for Relay-Assisted TDD Cellular System with Dynamic Frequency Reuse
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具有动态频率复用的中继辅助 TDD 蜂窝系统的功率分配

DOI:
10.1109/twc.2012.060212.110268
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发表时间:
2012-06
影响因子:
10.4
通讯作者:
Yanfang Xu
Yanfang Xu
中科院分区:
计算机科学1区
文献类型:
--
作者:
Rui Yin;Zhaoyang Zhang;Gu;ing Yu;Yu Zhang;Yanfang Xu

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研究了基于中继辅助时分双工的多小区系统中的功率分配问题。在这样的系统中,每个用户的可达到的数据速率不仅由于其中固有的动态空间频率重用而与其他用户的数据速率耦合,而且由于所需的两跳传输而在连续时隙之间耦合,这分别导致所谓的“空间耦合”和“时间耦合”性质。为了解决这两个耦合效应在一个中继辅助TDD蜂窝系统,我们制定了一个最佳的功率分配问题的异步情况下,不同的细胞独立工作的系统。我们观察到,该问题是非凸和NP-难的,但可以转换为几何规划(GP)问题,并解决了相邻点的方法。在没有中央控制器和/或细胞之间的大量信息交换是禁止的情况下,采用博弈论来导出分布式解决方案。最后,我们通过大量的仿真验证了所提出的算法。
This paper considers the power allocation problem in a relay-assisted Time-Division-Duplex-based multiple-cell system. In such a system, the achievable data rate of each user is not only coupled with those of others due to the inherent dynamic spatial frequency reuse therein, but also coupled between consecutive time slots due to the required two-hop transmission, which results in the so-called "spatial-coupling" and "time-coupling" nature, respectively. To address both of the two coupling effects in a relay assisted TDD cellular system, we formulate an optimal power allocation problem for the asynchronous scenario of the system where different cells work independently. We observe that the problem is non-convex and NP-hard, but can be converted to Geometric Programming (GP) problems and solved by interior-point methods. In case there is no central controller and/or massive information exchange among cells is prohibitive, game theory is employed to derive the distributed solutions. Finally, we validate the proposed algorithms by extensive simulations.
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