Abstract
Free space optical (FSO) communication is a promising candidate for the next generation (5G and beyond) wireless communication systems, due to its merits (i.e. low latency, high data rate, and license-free band, among others). However, atmospheric turbulence (AT) as well as pointing error (PE) are two of the main challenges with FSO communication that affect its performance. Here, the exact closed-form expression of the average secrecy capacity and secrecy outage probability under the composite effect of AT and non-zero boresight PEs is evaluated. For all the regimes of the AT (weak to strong), a generalised Malaga distribution is used to model the channel fading gain of the FSO link. The expressions are generalised and valid for all turbulence, and are applicable for intensity modulation direct detection as well as heterodyne detection techniques.
Highlights
Free space optical (FSO) communication has many advantages such as the license-free band, high data rate, low latency, and quick deployability, among others [1]
Despite its aforementioned merits the performance of FSO system is limited by atmospheric turbulence (AT) and pointing error (PE)
The link parameters used are: link length L=1 km, operational wavelength λ = 785 nm, and refraction structure parameter, Cn2=(1.2 × 10−13m−2∕3, 10−11m−2∕3, and Cn2 = 2.8 × 10−14m−2∕3). These are utilised to compute the Rytov variance using σR2 = 1.23Cn2(2Π∕λ)7∕6L11∕6 that subsequently helps to obtain the effects of AT for both links as (α = 2.296; β = 2), (α = 4.2; β = 3), and (α = 8; β = 4) representing strong, moderate, and weak AT, respectively
Summary
Free space optical (FSO) communication has many advantages such as the license-free band, high data rate, low latency, and quick deployability, among others [1]. Thereafter, the PLS performance for a mixed RF/FSO system under Gamma–Gamma AT model with PE (only jitter) has been analysed in [18] It is clear from the above papers and the references therein that the effect of boresight PEs have not been considered when evaluating the PLS of FSO communication systems despite its non-ignorable impact on the system performance. In this regard, the main contributions of this paper are as follows: 1) We derive an exact closed-form expression of ASC under the composite effect of AT and PEs (jitter and boresight) contrary to [15], where only the jitter effect is considered. 4) Some useful insights into the FSO secrecy performance are obtained through the asymptotic SOP analysis
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