Error Performance of a Cooperative Diversity Mixed FSO/RF System over Gamma-Gamma and Nakagami-M Fading Channels

Atmospheric induced-turbulence is the major challenge suffers by the free space optical (FSO) communication systems in practical deployment. To overcome this limitation, cooperative diversity technique is considered as a prominent solution to improve the system performance. In this paper, we present the error performance of a cooperative diversity AF-based mixed FSO/RF system with direct link over induced-fading channels. The FSO link is characterized by Gamma-Gamma distribution while the RF link is subjected to Nakagami-m distribution. Owning to difficulty involves in determining the probability density function (PDF) of the total signal-to-noise ratio (SNR), the moment generating function (MGF) for the total SNR is derived through the lower bound cumulative distribution function (CDF). Utilizing the MGF, the closed-form expression of the average bit error rate (ABER) with a series expansion of the modified Bessel function is then derived for the system. Moreover, the simulation result shows the accuracy of the derived ABER series expression. The effect of atmospheric turbulence under different conditions and the Nakagami-m fading parameter are observed on the ABER of the proposed system. The results also illustrate the effectiveness of the parallel relays in enhancing the system performance against fading effect. 

[1]  Zhao Shanghong,et al.  Performance analysis for mixed FSO/RF Nakagami-m and Exponentiated Weibull dual-hop airborne systems , 2017 .

[2]  Julian Cheng,et al.  Alamouti-type STBC for subcarrier intensity modulated wireless optical communications , 2012, 2012 IEEE Global Communications Conference (GLOBECOM).

[3]  Murat Uysal,et al.  Generalized Performance Analysis of Mixed RF/FSO Cooperative Systems , 2016, IEEE Transactions on Wireless Communications.

[4]  Viranjay M. Srivastava,et al.  Performance analysis of decode-and-forward dual-hop optical spatial modulation with diversity combiner over atmospheric turbulence , 2017 .

[5]  Michail Matthaiou,et al.  Diversity Combining in Hybrid RF/FSO Systems with PSK Modulation , 2011, 2011 IEEE International Conference on Communications (ICC).

[6]  Min Feng,et al.  Outage performance for parallel relay-assisted free-space optical communications in strong turbulence with pointing errors , 2011, 2011 International Conference on Wireless Communications and Signal Processing (WCSP).

[7]  Murat Uysal,et al.  Relay-Assisted Free-Space Optical Communication , 2007, 2007 Conference Record of the Forty-First Asilomar Conference on Signals, Systems and Computers.

[8]  Murat Uysal,et al.  End-to-end performance of mixed RF/FSO transmission systems , 2013, IEEE/OSA Journal of Optical Communications and Networking.

[9]  L. Andrews,et al.  Mathematical model for the irradiance probability density function of a laser beam propagating through turbulent media , 2001 .

[10]  George K. Karagiannidis,et al.  Outage probability of relayed free space optical communication systems , 2006 .

[11]  Jean Armstrong,et al.  Outage probability of cooperative relay networks in Nakagami-m fading channels , 2006, IEEE Communications Letters.

[12]  Manav R. Bhatnagar,et al.  Performance analysis of a DF based dual hop mixed RF-FSO system with a direct RF link , 2015, 2015 IEEE Global Conference on Signal and Information Processing (GlobalSIP).

[13]  S. Bloom,et al.  The last mile solution: Hybrid FSO Radio , 2002 .

[14]  M. Karimi,et al.  BER Analysis of Cooperative Systems in Free-Space Optical Networks , 2009, Journal of Lightwave Technology.

[15]  I. S. Ansari,et al.  Performance Analysis of Mixed Nakagami- $m$ and Gamma–Gamma Dual-Hop FSO Transmission Systems , 2015, IEEE Photonics Journal.

[16]  Anas M. Salhab.  A new scenario of triple-hop mixed RF/FSO/RF relay network with generalized order user scheduling and power allocation , 2016, EURASIP Journal on Wireless Communications and Networking.

[17]  Salama Ikki,et al.  Performance Analysis of Cooperative Diversity Wireless Networks over Nakagami-m Fading Channel , 2007, IEEE Communications Letters.

[18]  Viranjay M. Srivastava,et al.  Optical Spatial Modulation with Diversity Combiner in Dual-Hops Amplify-and-Forward Relay Systems Over Atmospheric Impairments , 2017, Wirel. Pers. Commun..

[19]  Pius A. Owolawi,et al.  Impact of transmission techniques in asymmetric RF/FSO system over Nakagami‐m and gamma‐gamma fading channels with pointing errors , 2018, Int. J. Commun. Syst..

[20]  Ha H. Nguyen,et al.  Performance Analysis of Adaptive M-QAM for Rayleigh Fading Cooperative Systems , 2008, 2008 IEEE International Conference on Communications.

[21]  Norman C. Beaulieu,et al.  A closed-form expression for the outage probability of decode-and-forward relaying in dissimilar Rayleigh fading channels , 2006, IEEE Communications Letters.

[22]  Parul Garg,et al.  Relay selection in mixed RF/FSO system using DF relaying , 2017, Photonic Network Communications.

[23]  Sanya Anees,et al.  Performance of an amplify-and-forward dual-hop asymmetric RF–FSO communication system , 2015, IEEE/OSA Journal of Optical Communications and Networking.

[24]  Mohamed-Slim Alouini,et al.  On the Performance Analysis of Dual-Hop Mixed FSO/RF Systems , 2016, IEEE Transactions on Wireless Communications.