Beamforming with relays in multicell networks based on correlation knowledge
Beamforming with relays in multicell networks based on correlation knowledge
复制标题
基于相关知识的多小区网络中的中继波束形成
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
G. Ascheid
中科院分区：
文献类型：
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作者：
Guido Dartmann;Dhiraj Kumar Shah;Xitao Gong;G. Ascheid
在具有频率重用-1的多小区网络中，小区间干扰(ICI)是一个限制因素。尤其是小区边缘用户容易受到强ICI的影响。通过波束形成，可以改善小区边缘用户的信干噪比(SINR)。除了相邻小区的干扰外，小区边缘用户经常被遮挡。为了克服这一问题，还使用了小区边缘区域中的中继器。在长期演进中，提出了两种类型的继电器。第一种称为类型1中继，拥有一个小区，第二种称为类型2中继，仅支持基站。为了最大化小区边缘用户的信噪比，提出了一种只考虑类型1中继的联合最大最小波束形成和调度算法。在多小区网络中，基于瞬时信道状态信息(CSI)的优化变得不可行，因此采用空间相关矩阵形式的长期CSI进行优化。数值结果表明，与没有中继器的传统网络相比，该网络的性能有所提高。
In a multicell network with a frequency reuse-1, intercell interference (ICI) is a limiting factor. Especially cell edge users are subject to strong ICI. With beamforming the signal to interference plus noise ratio (SINR) of the cell edge users can be improved. Beside the interference of adjacent cells, cell edge users are often shadowed. In order to overcome this problem, relays in the cell edge region are additionally used. In long-term evolution, two types of relays are proposed. The first one, called type-1 relay and owns a cell, the second one is called type-2 relay and only supports the base station. This paper considers the type-1 relay only and proposes a joint max-min beamforming and scheduling algorithm to maximize the SINR of cell edge users. In multicell networks, the optimization based on instantaneous channel state information (CSI) becomes infeasible, therefore, long-term CSI in form of spatial correlation matrices are used for the optimization. Numerical results underline the performance gain compared to conventional networks without relays.