Article

# Performance analysis of MIMO free-space optical systems in gamma-gamma fading.

Dept. of Electr. & Comput. Eng., Univ. of British Columbia, Vancouver, BC, Canada

IEEE Transactions on Communications (Impact Factor: 1.98). 11/2009; 57:3415-3424. DOI: 10.1109/TCOMM.2009.11.080168 Source: DBLP

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**ABSTRACT:**The impact of relay placement on diversity order in adaptive selective decode-and-forward (DF) cooperative strategies is here investigated in the context of free-space optical (FSO) communications over atmospheric turbulence channels with pointing errors when line of sight is available. The irradiance of the transmitted optical beam here considered is susceptible to moderate-to-strong turbulence conditions, following a gamma-gamma (GG) distribution together with a misalignment fading model where the effect of beam width, detector size and jitter variance is considered. Novel closed-form approximate bit error-rate (BER) expressions are obtained for a cooperative FSO communication setup with N relays, assuming that these relays are located in an area similar to an annulus around source or destination node. An analytical expression is here found that determines the best selection criterion based on the knowledge of the channel state information (CSI) of source-relay or relay-destination links in order to significantly increase the diversity order corresponding to the cooperative strategy under study. It is concluded that the highest diversity order is achieved when the relation βSRmin > βSD + βRminD is satisfied, wherein βSRmin, βRminD and βSD are parameters corresponding to the atmospheric turbulence conditions of source-relay and relay-destination link with the greatest scintillation index, and source-destination link, respectively.Opt. Express. 02/2015; 23(3):2600-2617. -
##### Conference Paper: Performance analysis of optical wireless communication system with a decode and forward relay

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**ABSTRACT:**In this paper, we analyze the performance of the cooperative optical wireless communication (OWC) systems under the effect of atmospheric turbulence. We consider a dual-hop OWC system having a relay-assisted link between source and destination using a decode and forward (DF) relaying protocol. The atmospheric turbulence channels are modeled by independent but not necessarily identically distributed (i.n.i.d) gamma-gamma fading statistics. The exact closed form expressions of outage probability and average bit-error rate (BER) are derived using the power series representations of the modified bessel function of second kind and illustrated through numerical plots.2014 International Conference on Signal Processing and Integrated Networks (SPIN); 02/2014 -
##### Article: On the Performance of MIMO FSO Communications over Double Generalized Gamma Fading Channels

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**ABSTRACT:**A major performance degrading factor in free space optical communication (FSO) systems is atmospheric turbulence. Spatial diversity techniques provide a promising approach to mitigate turbulence-induced fading. In this paper, we study the error rate performance of FSO links with spatial diversity over atmospheric turbulence channels described by the Double Generalized Gamma distribution which is a new generic statistical model covering all turbulence conditions. We assume intensity modulation/direct detection with on-off keying and present the BER performance of single-input multiple-output (SIMO), multiple-input single-output (MISO) and multiple-input multiple-output (MIMO) FSO systems over this new channel model.02/2015;

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