Full-duplex (FD) technology combined with dual-polarization (DP) multiple-input multiple-output (MIMO) systems is attractive to improve spectral efficiency and to enhance link capacity. Cancelling self-interference (SI) in such DPFD MIMO systems using beamforming techniques is very challenging due to a significant difference of the co-polarization and cross-polarization SI channels. In this letter, an analog adaptive filter structure is proposed to mitigate both co-polarization and cross-polarization SIs in DPFD MIMO systems. Stationary analysis is applied to evaluate the performance of the proposed structure. Simulation results show that about 45 dB to 55 dB of SI cancellation can be achieved regardless of the isolation differences between cross-polarization and co-polarization channels.

中文翻译：

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双极化全双工 MIMO 系统中的模拟自干扰消除


全双工（FD）技术与双极化（DP）多输入多输出（MIMO）系统相结合对于提高频谱效率和增强链路容量具有吸引力。由于共极化和交叉极化 SI 信道的显着差异，使用波束成形技术消除此类 DPFD MIMO 系统中的自干扰 (SI) 非常具有挑战性。在这封信中，提出了一种模拟自适应滤波器结构来减轻 DPFD MIMO 系统中的共极化和交叉极化 SI。应用平稳分析来评估所提出结构的性能。仿真结果表明，无论交叉极化和同极化通道之间的隔离度差异如何，都可以实现约 45 dB 至 55 dB 的 SI 消除。