Performance study of terrestrial multi-hop OFDM FSO communication systems with pointing errors over turbulence channels

Abstract

The free-space optical communication systems attract significant research and commercial interest the last few years, due to their high performance and reliability characteristics along with their, relatively, low installation and operational cost. Moreover, due to the fact that these systems are using the atmosphere as propagation path, their performance is varying according to its characteristics. Here, we present the performance analysis of a serially relayed radio-on-free-space-optical (RoFSO) communication system which employs the orthogonal frequency division multiplexing technique, with a quadrature amplitude modulation scheme, over atmospheric turbulence channels modelled by either the Gamma-Gamma or the Gamma distribution model. For this RoFSO communication link, we derive closed-form mathematical expressions for the estimation of its average bit error rate and outage probability, taking into account the relays' number, the atmospheric turbulence and the pointing errors effect. Furthermore, for realistic parameter values, numerical results are presented using the derived mathematical expressions, which are verified through the corresponding numerical simulations.

Investigations on Orthogonal-Frequency Division Multiplexed-Mode-Division Multiplexed MM Wave-on-Free Space Optics Transmission using Laguerre-Gaussian Modal Beams

“…Panda and Bhanja (2021) reported an improved performance evaluation of OFDM-FSO scheme by designing a modified OFDM receiver. In the previous works reported in (Sharma, 2014;Patel et al, 2014;Nistazakis et al, 2016;Attri et al, 2017;Zhang et al, 2018;Ajewole et al, 2019;Gupta et al, 2019;Hario et al, 2019;Darwesh and Kopeika, 2020;Panda and Bhanja, 2021) single-channel OFDM transmission has been discussed over free-space channel. Further enhancement of transmission capacity of FSO can be achieved by employing more OFDM channels transmission simultaneously which can be achieved using Wavelength-Division Multiplexed (WDM) transmission.…”

“…The maximum range for clear atmospheric conditions is reported as 17 km at 2 Gbps and 14 km at 5 Gbps information rate. Nistazakis et al (2016) reported the derivation of mathematical expression for calculating the outage probability of a multi-hop terrestrial OFDM-Ro-FSO transmission scheme under the influence of atmospheric turbulent conditions and pointing errors. The authors analytically reported that as the number of relay nodes increases in the multi-hop system, the outage probability performance of the OFDM-Ro-FSO transmission improves.…”

Solid core PCF-based mode selector for MDM-Ro-FSO transmission systems

“…Ro-FSO may pave the way towards a ubiquitous platform for seamless integration of radio and optical networks without expensive optical fiber cabling in WLANs [9]. Recent developments in Ro-FSO include experimental measurements [9][10][11] and mathematical modeling [12][13][14][15] under atmospheric turbulence and scintillation effects. To increase the capacity of Ro-FSO systems, multiplexing in the wavelength [16], intensity [17]matand polarization [18] dimensions has been demonstrated.…”

Ανάπτυξη Προηγμένων Τεχνικών Στα Συστήματα Ασύρματων Οπτικών Επικοινωνιών Για Την Αντιστάθμιση Των Συνεπειών Του Σπινθηρισμού Και Του Θορύβου Φάσης

“…Παραδόξως, η εφαρμογή της OFDM στο οπτικό φάσμα συχνοτήτων άργησε αρκετά να πραγματοποιηθεί, κυρίως λόγω του ότι η ανθεκτικότητά της κόντρα στη διασπορά του οπτικού καναλιού δεν είχε γίνει αποδεκτή, έως ότου ο Dixon με τους συνεργάτες του, [Dixon et al 2001 [Bekkali et al 2010;Nistazakis et al 2015a;Mostafa et al 2012;Nistazakis et al 2015b;Selvi et al 2012;Wang et al 2016b;Wang et al 2015;Tsukamoto et al 2008 [Nistazakis et al 2016], επέκτειναν ακόμα περισσότερο τις [Bekkali et al 2010;Nistazakis et al 2015b] [Varotsos et al 2018a;Varotsos et al 2017b;Varotsos et al 2018b;Varotsos et al 2016b]. [Varotsos et al 2018a;Tsiftsis et al 2006;Karagiannidis et al 2006;Safari et al 2007;Safari et al 2008].…”

“…Κατά τη σειριακή συνδεσμολογία DF κόμβων, μια διακοπή συμβαίνει έστω και όταν μία, οποιαδήποτε, από τις ενδιάμεσες, μεμονωμένες, ζεύξεις αποτύχει στη λειτουργία της, [Kashani et al 2013;Akella et al 2005;Safari et al 2008;Nistazakis et al 2016], δηλαδή εφόσον το λαμβανόμενο σήμα σε έναν οποιοδήποτε κόμβο πέσει κάτω από το κρίσιμο προκαθορισμένο κατώφλι που αποφαίνεται για την ορθή λειτουργία της αντίστοιχης ζεύξης.…”