Spectral-Energy Efficiency Tradeoff in Relay-Aided Cellular Networks
Spectral-Energy Efficiency Tradeoff in Relay-Aided Cellular Networks
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DOI：
10.1109/twc.2013.092013.121692
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发表时间：
2013-07
影响因子：
10.4
通讯作者：
Ivan Ku;Chengxiang Wang;J. Thompson
中科院分区：
文献类型：
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作者：
Ivan Ku;Chengxiang Wang;J. Thompson
针对多小区多输入多输出蜂窝网络下行链路，提出了一种中继协作方案。中继站（RS）将协作地发送在广播阶段期间获得的所有用户设备的信号副本。我们考虑不同的RS解码策略在广播阶段和联合中继传输与不同程度的信道状态信息（CSI）共享在中继阶段。我们还提出了部分半正交用户选择（PSUS）方法专门为中继合作。频谱和能量效率，然后评估中继协作方案。同时，还研究了不同合作水平下的合作成本。仿真结果表明，联合RS解码优于独立的RS解码，但需要一个数量级的比特率大于中继网络可实现的协作链路。与需要全局CSI的竞争用户选择方法相比，所提出的用于中继相位联合传输的PSUS方法以不到一半的协作成本操作，同时仅引入系统性能的轻微劣化。
A relay cooperation scheme is proposed for the downlink of multicell multiple-input-multiple-output cellular networks. The relay stations (RSs) will cooperatively transmit the signal replicas of all the user equipments obtained during the broadcast phase. We consider different RS decoding strategies during the broadcast phase and joint relay transmission with different degrees of channel state information (CSI) sharing during the relay phase. We also propose the partial semi-orthogonal user selection (PSUS) method designed specifically for relay cooperation. The spectral and energy efficiencies are then evaluated for the relay cooperation scheme. Its cooperative costs for different cooperation levels are also investigated. Simulation results indicate that joint RS decoding outperforms independent RS decoding but a cooperative link with a bit rate of an order of magnitude greater than that achievable by the relay network is required. Compared to the competing user selection methods that require global CSI, the proposed PSUS method utilized for relay phase joint transmission operates at less than half of the cooperative cost while introduces only a slight degradation in system performance.