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arXiv 1702.08703cs.ITmath.IT
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基于IQI的大规模MIMO宽线性预编码算法及性能分析

Widely-Linear Precoding for Large-Scale MIMO with IQI: Algorithms and Performance Analysis

Wence Zhang, Rodrigo C. de Lamare, Cunhua Pan, Ming Chen, Jianxin Dai, Bingyang Wu, Xu Bao

摘要:

在本文中,我们研究了宽线性预编码技术,以减轻同相/正交相位(IQ)不平衡(IQI)在大规模多输入多输出(MIMO)系统的下行链路。我们采用一个实值信号模型,考虑到在发射机的IQI,然后开发宽线性迫零(WL-ZF),宽线性匹配滤波器(WL-MF),宽线性最小均方误差(WL-MMSE)和宽线性块对角化(WL-BD)类型的预编码算法为{ \color{red}单天线和多天线用户。}我们还提出了WL-ZF和WL-BD的性能分析。结果表明,在无IQI的情况下,WL-ZF具有与ZF完全相同的复用增益和功率偏移;而在有IQI的情况下,WL-ZF具有与ZF相同的复用增益和理想的IQ支路,但具有较小的功率损耗,这与系统规模和IQ参数有关。我们还比较了WL-BD和BD的性能。分析表明,在理想IQ支路情况下,WL-BD具有与BD相同的数据率,而在IQI存在时,WL-BD实现了与BD相同的复用增益,且IQ不平衡。数值结果验证了分析,并表明,所提出的宽线性类型的预编码方法显着优于他们的传统同行与IQI和接近那些与理想的IQ分支。

英文摘要:

In this paper we study widely-linear precoding techniques to mitigate in-phase/quadrature-phase (IQ) imbalance (IQI) in the downlink of large-scale multiple-input multiple-output (MIMO) systems. We adopt a real-valued signal model which takes into account the IQI at the transmitter and then develop widely-linear zero-forcing (WL-ZF), widely-linear matched filter (WL-MF), widely-linear minimum mean-squared error (WL-MMSE) and widely-linear block-diagonalization (WL-BD) type precoding algorithms for both {\color{red} single- and multiple-antenna users.} We also present a performance analysis of WL-ZF and WL-BD. It is proved that without IQI, WL-ZF has exactly the same multiplexing gain and power offset as ZF, while when IQI exists, WL-ZF achieves the same multiplexing gain as ZF with ideal IQ branches, but with a minor power loss which is related to the system scale and the IQ parameters. We also compare the performance of WL-BD with BD. The analysis shows that with ideal IQ branches, WL-BD has the same data rate as BD, while when IQI exists, WL-BD achieves the same multiplexing gain as BD without IQ imbalance. Numerical results verify the analysis and show that the proposed widely-linear type precoding methods significantly outperform their conventional counterparts with IQI and approach those with ideal IQ branches.

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