Telecommunications University, Nha Trang 650000, Vietnam.
Le Quy Don Technical University, Ha Noi 100000, Vietnam.
Sensors (Basel). 2020 Mar 17;20(6):1671. doi: 10.3390/s20061671.
Imperfect channel state information (I-CSI) and imperfect transceiver hardware often happen in wireless communication systems due to the time-varying and random characteristics of both wireless channels and hardware components. The impacts of I-CSI and hardware impairments (HI) reduce not only the system performance but also the self-interference cancellation (SIC) capability of full-duplex (FD) devices. To investigate the system performance in realistic scenarios, in this paper, we consider the performance of an FD multiple-input multiple-output (MIMO) relay system under the effects of I-CSI, imperfect SIC (I-SIC), and imperfect transceiver hardware. We mathematically derive the exact closed-form expressions of the outage probability (OP) and ergodic capacity of the considered HI-FD-MIMO relay system over Rayleigh fading channels with the existence of I-CSI, I-SIC, and HI. Numerical results indicate that the performance in terms of OP and capacity reaches saturation faster, especially when the channel estimation error, the residual self-interference (RSI), and HI levels are remarkable. Therefore, various solutions for effectively reducing the channel estimation error, RSI, and HI levels in the HI-FD-MIMO relay system should be carried out to improve the system performance. All derived mathematical expressions are verified through Monte-Carlo simulations.
由于无线信道和硬件组件的时变和随机特性，无线通信系统中经常会出现不完善的信道状态信息（I-CSI）和不完善的收发器硬件。I-CSI 和硬件损伤（HI）的影响不仅降低了系统性能，还降低了全双工（FD）设备的自干扰消除（SIC）能力。为了研究实际场景中的系统性能，本文考虑了在 I-CSI、不完善 SIC（I-SIC）和不完善收发器硬件的影响下，FD 多输入多输出（MIMO）中继系统的性能。我们在存在 I-CSI、I-SIC 和 HI 的瑞利衰落信道上，推导出了考虑 HI-FD-MIMO 中继系统的中断概率（OP）和遍历容量的精确闭式表达式。数值结果表明，OP 和容量方面的性能更快达到饱和，特别是当信道估计误差、残余自干扰（RSI）和 HI 水平显著时。因此，应该采取各种解决方案来有效降低 HI-FD-MIMO 中继系统中的信道估计误差、RSI 和 HI 水平，以提高系统性能。所有推导出的数学表达式都通过蒙特卡罗模拟进行了验证。
