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首页> 外文期刊>Signal Processing, IET >Impact of channel estimation error on zero-forcing-based multiple-input–multiple-output two-way relaying
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Impact of channel estimation error on zero-forcing-based multiple-input–multiple-output two-way relaying

机译：信道估计误差对基于零强迫的多输入多输出双向中继的影响

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摘要

In this study, the authors investigate the impact of channel estimation error (CEE) on the performance of a multiple-input-multiple-output (MIMO) two-way relay system under Rayleigh fading. Herein, transmit/receive zero-forcing (ZF) is employed at the two source nodes, whereas analogue network coding is used at the relay node. Fundamentally, for making use of transmit/receive ZF, all nodes must be aware of channel state information (CSI). As perfect CSI may not always be available in practical scenarios, the CEE does exist in the considered system. By taking the imperfect CSI into account, they enucleate that the residual self-interference and additional noise pertaining to the CEE have effect of reducing end-to-end signal-to-noise ratios (SNRs) at the two source nodes. Based on the statistical characterisations of these post-processing SNRs, they carry out the overall system outage probability analysis. Further, they investigate the asymptotic outage behaviour to deduce the achievable diversity order. They substantiate that the diversity order may reduce to zero under severe impact of CEE. In addition, they derive a closed-form expression of ergodic sum-rate of the considered system with CEE. Numerical and simulation investigations are conducted to support all the theoretical findings using various values of CEE and antenna configurations.
机译：在这项研究中，作者研究了瑞利衰落下信道估计误差（CEE）对多输入多输出（MIMO）两路中继系统性能的影响。在此，在两个源节点处采用发送/接收迫零（ZF），而在中继节点处采用模拟网络编码。从根本上说，为了利用发送/接收ZF，所有节点必须知道信道状态信息（CSI）。由于在实际情况下可能无法始终使用完美的CSI，因此在考虑的系统中确实存在CEE。通过考虑不完美的CSI，他们得出结论，与CEE有关的残余自干扰和附加噪声具有降低两个源节点的端到端信噪比（SNR）的作用。基于这些后处理SNR的统计特征，它们执行了整个系统中断概率分析。此外，他们研究了渐进式中断行为，以推断出可实现的分集阶数。他们证实，在中欧和东欧的严重影响下，多样性等级可能降为零。此外，他们使用CEE导出了所考虑系统的遍历总和率的封闭形式。进行了数值和仿真研究，以支持使用各种CEE和天线配置值的所有理论发现。

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