The existing relay-assisted terahertz (THz) wireless system is limited to dual-hop transmission with pointing errors and short-term fading without considering the shadowing effect. This paper analyzes the performance of a multihop-assisted backhaul communication mixed with an access link under the shadowed fading with antenna misalignment errors. We derive statistical results of the signal-to-noise ratio (SNR) of the multihop link by considering independent but not identically distributed (i.ni.d) $\alpha$-$\mu$ fading channel with pointing errors employing channel-assisted (CA) and fixed-gain (FG) amplify-and-forward (AF) relaying for each hop. We analyze the outage probability, average BER, and ergodic capacity performance of the mixed system considering the generalized-$K$ shadowed fading model with AF and decode-and-forward (DF) protocols employed for the access link. We derive exact expressions of the performance metrics for the CA-multihop system with the DF relaying for the last hop and upper bound of the performance for the FG-multihop system using FG and DF relaying at the last relay. We also develop asymptotic analysis in the high SNR to derive the diversity order of the system and use computer simulations to provide design and deployment aspects of multiple relays in the backhaul link to extend the communication range for THz wireless transmissions.
翻译:现有的中继辅助地铁无线系统(THZ)限于带有指针错误和短期衰减的双速传输,而没有考虑到阴影效应。本文分析多速辅助回航通信的性能,在天线偏差误差的阴影淡化下连接连接连接。我们通过考虑独立但非完全分布(i.ni.d.d.) $\alpha$-$\mu$xmoue 淡化频道,带有指针错误的双速传输,使用频道辅助(CA)和固定增益(FG) 放大和前向(FG) 增强和前向(AFG) 转发。我们分析混合系统的出局概率、平均ABER和输出能力性能,考虑到与AF和DF使用的通用-K$的暗面淡化模式和解码-前方(DF)协议。我们从CA-多压系统(CARC)的后向DFDR最后的中继传输和上层传输系统(SMH)的中继传输和高级中继系统(SMDFDFDFDR)的中继系统,我们还将的中继和SDFDF的中继传输系统的高级设计设计系统,也提供最后部署和上传输系统的系统发展。