The conventional zero forcing (ZF) equalizer suffers from the noise enhancement problem and the increasing complexity with the increase of the number of subcarriers. On the other hand, the minimum mean square error (MMSE) equalizer mitigates the noise enhancement, but it needs estimation of the signal‐to‐noise ratio (SNR) to work properly. In addition, the Joint Low‐complexity Regularized ZF (JLRZF) equalization and carrier frequency offset compensation scheme mitigates the noise enhancement using a constant parameter called the regularization parameter without SNR estimation. In this paper, we present a JLRZF with successive iInterference cancelation (JLRZF‐SIC) scheme for multiple‐input multiple‐output (MIMO) discrete Fourier transform orthogonal frequency division multiplexing (DFT‐OFDM) system to cope with the above‐mentioned problems. The proposed JLRZF‐SIC scheme jointly performs the equalization and the carrier frequency offset (CFO) compensation processes in two steps. The coupling nature of the MIMO channel is canceled in the first step. A regularization term is added in the second step to avoid the inter‐symbol‐interference (ISI). Simulation results show that the proposed JLRZF‐SIC scheme improves the system performance with low complexity, especially in the presence of estimation errors.

中文翻译：

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多输入多输出正交频分复用通信系统的联合低复杂度非线性均衡和载波频偏补偿

常规的零强迫（ZF）均衡器遭受噪声增强问题以及随着子载波数量的增加而增加的复杂性。另一方面，最小均方误差（MMSE）均衡器可减轻噪声的增加，但需要估计信噪比（SNR）才能正常工作。此外，联合低复杂度正则化ZF（JLRZF）均衡和载波频率偏移补偿方案使用称为regularization参数的恒定参数（无需进行SNR估计）来减轻噪声增强。本文针对多输入多输出（MIMO）离散傅里叶变换正交频分复用（DFT-OFDM）系统提出了一种具有连续iInterference消除（JLRZF-SIC）方案的JLRZF，以解决上述问题。提出的JLRZF-SIC方案分两步联合执行均衡和载波频率偏移（CFO）补偿过程。在第一步中，消除了MIMO信道的耦合特性。第二步中添加了正则化项，以避免符号间干扰（ISI）。仿真结果表明，所提出的JLRZF-SIC方案以较低的复杂度提高了系统性能，特别是在存在估计误差的情况下。