TY - JOUR
T1 - Optimal Power Allocation between Beam Tracking and Symbol Detection Channels in a Free-Space Optical Communications Receiver
AU - Bashir, Muhammad Salman
AU - Alouini, Mohamed Slim
N1 - Publisher Copyright:
© 1972-2012 IEEE.
PY - 2021/11/1
Y1 - 2021/11/1
N2 - Free-space optical (FSO) communications will play an important role in the backhaul of future generation of wireless networks in order to support high data rates. Because of narrow beamwidth inherent to an optical signal, acquisition and tracking form an important component of any FSO communication system. In this study, we have analyzed the optimization of received power allocation between tracking and data channels in an FSO receiver. In this regard, we have carried out a detailed analysis of the error statistics of the centroid estimator that is used for tracking the beam with the help of an array. The objective function that is optimized (minimized) are the probability of error and the probability of outage, and the optimization of power allocation is carried out as a function of parameters such as noise power, pointing error variance, pointing error correlation coefficient, and the threshold of outage. We have analyzed the optimization concerning the lognormal and exponentiated Weibull fading scenarios as well. We learn that the optimal power allocation is a function of the received signal-to-noise ratio: a lower signal-to-noise ratio dictates that a higher fraction of received power should be diverted to the tracking channel and vice versa.
AB - Free-space optical (FSO) communications will play an important role in the backhaul of future generation of wireless networks in order to support high data rates. Because of narrow beamwidth inherent to an optical signal, acquisition and tracking form an important component of any FSO communication system. In this study, we have analyzed the optimization of received power allocation between tracking and data channels in an FSO receiver. In this regard, we have carried out a detailed analysis of the error statistics of the centroid estimator that is used for tracking the beam with the help of an array. The objective function that is optimized (minimized) are the probability of error and the probability of outage, and the optimization of power allocation is carried out as a function of parameters such as noise power, pointing error variance, pointing error correlation coefficient, and the threshold of outage. We have analyzed the optimization concerning the lognormal and exponentiated Weibull fading scenarios as well. We learn that the optimal power allocation is a function of the received signal-to-noise ratio: a lower signal-to-noise ratio dictates that a higher fraction of received power should be diverted to the tracking channel and vice versa.
KW - Beam tracking
KW - exponentiated Weibull fading
KW - free-space optical communications
KW - lognormal fading
KW - optimal power allocation
KW - pointing error
KW - probability of error
KW - probability of outage
UR - http://www.scopus.com/inward/record.url?scp=85112643075&partnerID=8YFLogxK
U2 - 10.1109/TCOMM.2021.3099838
DO - 10.1109/TCOMM.2021.3099838
M3 - Article
AN - SCOPUS:85112643075
VL - 69
SP - 7631
EP - 7646
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
SN - 1558-0857
IS - 11
M1 - 9495783
ER -