In this paper, the digital self-interference (SI) cancellation in a single radio frequency (RF) chain massive multi-input multi-output (MIMO) full-duplex (FD) orthogonal frequency division multiplexing (OFDM) system with phase noise is studied. To compensate the phase noise, which introduces SI channel estimation error and thus degrades the SI cancellation performance, a weighted linear SI channel estimator is derived to minimize the residual SI power in each OFDM symbol. The digital SI cancellation ability of the proposed method, which is defined as the ratio of the SI power before and after the SI cancellation, is analyzed. Simulation results show that the proposed optimal linear SI channel estimator significantly outperforms the conventional least square (LS) estimator in terms of the SI cancellation ability for the cases with strong SI and low oscillator quality.

翻译：本文研究了存在相位噪声的单射频链大规模多输入多输出（MIMO）全双工（FD）正交频分复用（OFDM）系统中的数字自干扰（SI）消除技术。为补偿导致SI信道估计误差并进而降低SI消除性能的相位噪声，提出了一种加权线性SI信道估计器，以最小化每个OFDM符号内的残余SI功率。分析了所提方法的数字SI消除能力（定义为SI消除前后功率之比）。仿真结果表明，在强SI和低振荡器质量的情况下，所提出的最优线性SI信道估计器在SI消除能力上显著优于传统最小二乘（LS）估计器。