TY - GEN
T1 - Performance analysis and power allocation for two-way multi-user mixed RF/FSO relay networks
AU - Al-Eryani, Yasser F.
AU - Salhab, Anas M.
AU - Zummo, Salam A.
AU - Alouini, Mohamed Slim
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/6/8
Y1 - 2018/6/8
N2 - This paper studies the performance of two-way multiuser mixed radio frequency/free space optical (RF/FSO) relay networks with opportunistic user scheduling1 and asymmetric fading channels. The considered system consists of multiple users communicating with a destination node through a decode-and forward (DF) relay in a two-way fashion. The links between the users and relay are assumed to be Rayleigh distributed RF channels, while the link between the relay and destination is Gamma-Gamma fading FSO channel. First, exact closed-form and asymptotic (high signal-to-noise ratio (SNR)) expressions are derived for the outage probability. Then, the asymptotic results are used to conduct a power optimization algorithm where exact expressions for the optimal transmission powers are provided. Additionally, performance comparisons between the considered two-way relaying (TWR) and one-way relaying (OWR) schemes under different network parameters are provided and discussed. The results show that the opportunistic user scheduling in TWR networks does not affect the network diversity order, but it enhances the system coding gain. Additionally, it is found that severe pointing error may result in a total service blockage. Additionally, the proposed power allocation scheme is found to enhance the network outage performance significantly compared to the scheme of equal power allocation.
AB - This paper studies the performance of two-way multiuser mixed radio frequency/free space optical (RF/FSO) relay networks with opportunistic user scheduling1 and asymmetric fading channels. The considered system consists of multiple users communicating with a destination node through a decode-and forward (DF) relay in a two-way fashion. The links between the users and relay are assumed to be Rayleigh distributed RF channels, while the link between the relay and destination is Gamma-Gamma fading FSO channel. First, exact closed-form and asymptotic (high signal-to-noise ratio (SNR)) expressions are derived for the outage probability. Then, the asymptotic results are used to conduct a power optimization algorithm where exact expressions for the optimal transmission powers are provided. Additionally, performance comparisons between the considered two-way relaying (TWR) and one-way relaying (OWR) schemes under different network parameters are provided and discussed. The results show that the opportunistic user scheduling in TWR networks does not affect the network diversity order, but it enhances the system coding gain. Additionally, it is found that severe pointing error may result in a total service blockage. Additionally, the proposed power allocation scheme is found to enhance the network outage performance significantly compared to the scheme of equal power allocation.
KW - Gamma-Gamma fading
KW - Mixed RF/FSO relaying
KW - Opportunistic user scheduling
KW - Power allocation
KW - Two-way relaying
UR - http://www.scopus.com/inward/record.url?scp=85049199808&partnerID=8YFLogxK
U2 - 10.1109/WCNC.2018.8377057
DO - 10.1109/WCNC.2018.8377057
M3 - Conference contribution
AN - SCOPUS:85049199808
T3 - IEEE Wireless Communications and Networking Conference, WCNC
SP - 1
EP - 6
BT - 2018 IEEE Wireless Communications and Networking Conference, WCNC 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2018 IEEE Wireless Communications and Networking Conference, WCNC 2018
Y2 - 15 April 2018 through 18 April 2018
ER -