Optimized One-Way Relaying Strategy With Outdated CSI Quantization for Spatial Multiplexing
Optimized One-Way Relaying Strategy With Outdated CSI Quantization for Spatial Multiplexing
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DOI：
10.1109/tsp.2012.2197209
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发表时间：
2012-08
影响因子：
5.4
通讯作者：
Wei Xu;Xiaodai Dong
中科院分区：
文献类型：
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作者：
Wei Xu;Xiaodai Dong
该通信考虑使用预编码和有限反馈的MIMO中继下行链路系统。由于传统的预编码矩阵是通过将量化后的信道状态信息(CSI)反馈作为真实的CSI来直接获得的，因此我们提出了一种综合考虑信道量化误差和反馈时延影响的优化的中继预编码策略。在中继站可用的过时CSI量化的条件下，通过最小化CSI失配上的期望均方误差(MSE)准则来优化中继预编码。利用Karush-Kuhn-Tucker(KKT)条件，在与传统方法相当的计算复杂度下，得到了继电保护设计的闭合解。数值结果验证了该方案的有效性。
This correspondence considers a MIMO relay downlink system using precoding and limited feedback. Since the conventional precoding matrices are directly obtained by treating the quantized channel state information (CSI) feedback as real CSI, we propose an optimized relay precoding strategy by taking both effects of channel quantization error and feedback delay into account. Conditioned on the outdated CSI quantization available at the relay station, the relay precoding is optimized via minimizing an expected mean-square error (MSE) criterion over CSI mismatches. By using Karush-Kuhn-Tucker (KKT) conditions, a closed-form solution to the relay design is achieved with comparable computational complexity relative to the conventional approach. Numerical results verify the effectiveness of the proposed scheme.