TY - JOUR
T1 - Outage Performance of Mixed RF-FSO Systems over DGG and Nakagami-m Channels
AU - Ashrafzadeh, Behnam
AU - Soleimani-Nasab, Ehsan
AU - Zaimbashi, Amir
AU - Uysal, Murat
N1 - Funding Information:
Manuscript received July 4, 2020; revised July 21, 2020; accepted July 28, 2020. Date of publication August 6, 2020; date of current version December 9, 2020. The work of Behnam Ashrafzadeh, Ehsan Soleimani-Nasab, and Amir Zaimbashi was supported by the Iran National Science Foundation under Grant 98002726. The associate editor coordinating the review of this article and approving it for publication was B. Makki. (Corresponding author: Ehsan Soleimani-Nasab.) Behnam Ashrafzadeh and Amir Zaimbashi are with the Faculty of Electrical and Computer Engineering, Shahid Bahonar University of Kerman, Kerman 7616914111, Iran.
Publisher Copyright:
© 2012 IEEE.
PY - 2020/12
Y1 - 2020/12
N2 - In mixed RF (radio frequency)-FSO (free space optical) systems, the FSO link is used for backhauling while RF is used for wireless access. In many practical deployment scenarios especially in urban environments, more than one FSO hop is required to avoid blockage and facilitate the line-of-sight connectivity. In this letter, we study the performance of a triple-hop RF-FSO-FSO link. We assume that the RF link is subject to Nakagami- m fading while FSO links are subject to double generalized Gamma (DGG) turbulence in addition to pointing errors. We first derive an exact closed-form expression for outage probability (OP) in terms of bivariate Fox-H function. Then, we carry out an asymptotical analysis to derive achievable diversity gains. We further present simulations to verify the accuracy of the derived expressions and investigate the effect of several system and channel parameters on the performance.
AB - In mixed RF (radio frequency)-FSO (free space optical) systems, the FSO link is used for backhauling while RF is used for wireless access. In many practical deployment scenarios especially in urban environments, more than one FSO hop is required to avoid blockage and facilitate the line-of-sight connectivity. In this letter, we study the performance of a triple-hop RF-FSO-FSO link. We assume that the RF link is subject to Nakagami- m fading while FSO links are subject to double generalized Gamma (DGG) turbulence in addition to pointing errors. We first derive an exact closed-form expression for outage probability (OP) in terms of bivariate Fox-H function. Then, we carry out an asymptotical analysis to derive achievable diversity gains. We further present simulations to verify the accuracy of the derived expressions and investigate the effect of several system and channel parameters on the performance.
KW - Double generalized gamma
KW - Nakagami-m
KW - free space optical communications
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U2 - 10.1109/LWC.2020.3014683
DO - 10.1109/LWC.2020.3014683
M3 - Article
AN - SCOPUS:85097716212
SN - 2162-2337
VL - 9
SP - 2135
EP - 2139
JO - IEEE Wireless Communications Letters
JF - IEEE Wireless Communications Letters
IS - 12
M1 - 9161013
ER -