School of Information and Communication Engineering, Chungbuk National University, Cheongju 28644, Korea.
Faculty of Basic Techniques, Telecommunications University, Khanh Hoa 650000, Vietnam.
Sensors (Basel). 2021 Aug 20;21(16):5628. doi: 10.3390/s21165628.
In practice, self-interference (SI) in full-duplex (FD) wireless communication systems cannot be completely eliminated due to imperfections in different factors, such as the SI channel estimation and hardware circuits. Therefore, residual SI (RSI) always exists in FD systems. In addition, hardware impairments (HIs) cannot be avoided in FD systems due to the non-ideal characteristics of electronic components. These issues motivate us to consider an FD-HI system with a decode-and-forward (DF) relay that is applied for vehicle-to-vehicle (V2V) communication. Unlike previous works, the performance of the proposed FD-HI-V2V system is evaluated over cascaded Rayleigh fading channels (CRFCs). We mathematically obtain the exact closed-form expressions of the outage probability (OP), system throughput (ST), and ergodic capacity (EC) of the proposed FD-HI-V2V system under the joint and crossed effects of the RSI, HIs, and CRFCs. We validate all derived expressions via Monte-Carlo simulations. Based on these expressions, the OP, ST, and EC of the proposed FD-HI-V2V system are investigated and compared with other related systems, such as ideal hardware (ID) and half-duplex (HD) systems, as well as a system over traditional Rayleigh fading channels (RFCs), to clearly show the impacts of negative factors.
在实际应用中，由于不同因素（如自干扰信道估计和硬件电路）的不完善，全双工（FD）无线通信系统中的自干扰（SI）无法完全消除。因此，FD 系统中始终存在残余 SI（RSI）。此外，由于电子元件的非理想特性，FD 系统中不可避免会存在硬件损伤（HI）。这些问题促使我们考虑在具有解码转发（DF）中继的 FD-HI 系统中应用于车对车（V2V）通信。与以往的工作不同，所提出的 FD-HI-V2V 系统的性能是在级联瑞利衰落信道（CRFC）上进行评估的。我们通过数学方法获得了在 RSI、HI 和 CRFC 的联合和交叉作用下，所提出的 FD-HI-V2V 系统的中断概率（OP）、系统吞吐量（ST）和遍历容量（EC）的精确闭式表达式。我们通过蒙特卡罗模拟验证了所有推导的表达式。基于这些表达式，研究并比较了所提出的 FD-HI-V2V 系统的 OP、ST 和 EC 与其他相关系统（如理想硬件（ID）和半双工（HD）系统）以及传统瑞利衰落信道（RFC）上的系统，以清楚地显示出负面影响。
