I/Q Imbalance Aware Widely-Linear Receiver for Uplink Multi-Cell Massive MIMO Systems: Design and Sum Rate Analysis
I/Q Imbalance Aware Widely-Linear Receiver for Uplink Multi-Cell Massive MIMO Systems: Design and Sum Rate Analysis
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DOI：
10.1109/twc.2016.2520935
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发表时间：
2015-06
影响因子：
10.4
通讯作者：
S. Zarei;W. Gerstacker;J. Aulin;R. Schober
中科院分区：
文献类型：
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作者：
S. Zarei;W. Gerstacker;J. Aulin;R. Schober
同相/正交相位不平衡（IQI）是通信系统中最重要的硬件损伤之一。它出现在直接转换收发器的模拟部分，可能导致严重的性能损失。在本文中，提出了用于上行链路多小区大规模多输入多输出（MIMO）系统的IQI感知宽线性（WL）信道估计和数据检测方案。由此产生的接收器是最小均方误差 (MMSE) 接收器的 WL 扩展，并通过分别处理接收信号的实部和虚部来联合减轻多用户干扰和 IQI。由此，基站和用户终端处产生的IQI都被考虑在内。所考虑的信道状态信息获取模型包括导频污染的影响，这是由于在相邻小区中重复使用相同的训练序列而引起的。我们应用随机矩阵理论的结果来推导大系统限制下所提出的 IQI 感知和传统 IQI 感知 (IQU) 接收器的渐近可实现总速率的解析表达式。我们的仿真和分析结果表明，所提出的 IQI 感知 WLMMSE (IQA-WLMMSE) 接收器在具有 IQI 的系统中的性能接近于没有 IQI 的理想系统中的 MMSE 接收器的性能。
In-phase/quadrature-phase imbalance (IQI) is one of the most important hardware impairments in communication systems. It arises in the analogue parts of direct conversion transceivers and can cause severe performance losses. In this paper, IQI aware widely-linear (WL) channel estimation and data detection schemes for uplink multicell massive multiple-input multiple-output (MIMO) systems are proposed. The resulting receiver is a WL extension of the minimum mean-square-error (MMSE) receiver and jointly mitigates multiuser interference and IQI by processing the real and the imaginary parts of the received signal separately. Thereby, the IQI arising at both the base station and the user terminals is taken into account. The considered channel state information acquisition model includes the effect of pilot contamination, which is caused by the reuse of the same training sequences in neighbouring cells. We apply results from random matrix theory to derive analytical expressions for the asymptotic achievable sum rates of the proposed IQI aware and conventional IQI unaware (IQU) receivers in the large system limit. Our simulation and analytical results show that the performance of the proposed IQI aware WLMMSE (IQA-WLMMSE) receiver in a system with IQI is close to that of the MMSE receiver in an ideal system without IQI.