TY - JOUR
T1 - Mixed THz/FSO Relaying Systems: Statistical Analysis and Performance Evaluation
AU - Li, Sai
AU - Yang, Liang
AU - Zhang, Jiayi
AU - Bithas, Petros S.
AU - Tsiftsis, Theodoros A.
AU - Alouini, Mohamed-Slim
N1 - KAUST Repository Item: Exported on 2022-09-14
Acknowledgements: This work was supported in part by the Key R&D Projects in Hunan Province under Grant (No. 2022GK2051), the Hunan High-tech Industry Science and Technology Innovation Leading Program Project under Grant (No. 2022GK4004), the Changsha Natural Science Foundation under Grant (No. kq2202172), and in part by the Hunan Natural Science Foundation.
PY - 2022/7/13
Y1 - 2022/7/13
N2 - In this paper, the performance of a mixed Terahertz/free-space optical (THz/FSO) wireless transmission system is studied, where the joint effects of channel fading and pointing errors are considered for both THz and FSO links. Employing the semi-blind amplify-and-forward protocol, we derive the cumulative distribution function and probability density function of the end-to-end signal-to-noise ratio. By applying the derived statistics, exact expressions for the outage probability (OP), average bit error rate (BER), and average channel capacity are obtained. In order to attain useful physical insights, asymptotic OP and average BER expressions are also presented. Based on them, the diversity gain is determined, which is shown to depend on channel fading and pointing errors of both links. In addition, by taking into account the hardware impairments, the OP of the non-ideal hardware system is derived. Moreover, the analysis is extended to multi-antenna scenarios and the asymptotic OP is obtained. Finally, illustrative numerical results are plotted and it can be observed that the path loss, channel fading, pointing errors and hardware impairments lead to a considerable degradation in system performance.
AB - In this paper, the performance of a mixed Terahertz/free-space optical (THz/FSO) wireless transmission system is studied, where the joint effects of channel fading and pointing errors are considered for both THz and FSO links. Employing the semi-blind amplify-and-forward protocol, we derive the cumulative distribution function and probability density function of the end-to-end signal-to-noise ratio. By applying the derived statistics, exact expressions for the outage probability (OP), average bit error rate (BER), and average channel capacity are obtained. In order to attain useful physical insights, asymptotic OP and average BER expressions are also presented. Based on them, the diversity gain is determined, which is shown to depend on channel fading and pointing errors of both links. In addition, by taking into account the hardware impairments, the OP of the non-ideal hardware system is derived. Moreover, the analysis is extended to multi-antenna scenarios and the asymptotic OP is obtained. Finally, illustrative numerical results are plotted and it can be observed that the path loss, channel fading, pointing errors and hardware impairments lead to a considerable degradation in system performance.
UR - http://hdl.handle.net/10754/679672
UR - https://ieeexplore.ieee.org/document/9829191/
U2 - 10.1109/twc.2022.3188698
DO - 10.1109/twc.2022.3188698
M3 - Article
SN - 1536-1276
SP - 1
EP - 1
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
ER -