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Uplink/Downlink Duality in Multi-Cell MU-MIMO Systems with Hardware Impairments

机译:具有硬件损害的多小区MU-MIMO系统中的上行链路/下行链路对偶

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In this paper, we propose an uplink/downlink duality framework for multi-cell multi-user multiple-input multiple-output (MU-MIMO) systems with residual hardware impairments (HWIs) at the base station and the user terminals. By employing the proposed uplink/downlink duality framework, complex downlink optimization problems can be transformed to equivalent dual uplink problems which are easier to solve. Thereby, for the same total transmit power, the same per-user signal-to-interference-plus-noise ratios (SINRs) are achieved in downlink and uplink. We apply the proposed uplink/downlink duality, and derive a multi-cell HWI aware minimum mean square error (MCHWA-MMSE) precoder. Our simulation results show that the proposed MCHWA-MMSE precoder achieves a substantially higher sum rate than conventional MMSE and conjugate beamforming precoders.
机译:在本文中,我们提出了一种在基站和用户终端具有残留硬件损伤(HWI)的多小区多用户多输入多输出(MU-MIMO)系统的上行链路/下行链路对偶框架。通过采用提出的上行链路/下行链路对偶性框架,可以将复杂的下行链路优化问题转换为更易于解决的等效双重上行链路问题。由此,对于相同的总发射功率,在下行链路和上行链路中实现了相同的每用户信号干扰加噪声比(SINR)。我们应用提出的上行链路/下行链路对偶性,并得出多小区HWI感知最小均方误差(MCHWA-MMSE)预编码器。我们的仿真结果表明,与传统的MMSE和共轭波束成形预编码器相比,所提出的MCHWA-MMSE预编码器实现了更高的总和率。

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