Abstract
In this work, we investigate the impact of the transmit aperture selection technique to alleviate the effect of jamming on a free space optical (FSO) communication system. We consider the FSO system to suffer from a jamming signal and Gaussian noise concurrently. The analysis in this paper is conducted on the assumption that all wireless optical links follow the negative exponential distribution with pointing error. A general N×1 FSO system is studied, which allows the transmitter to select a link with the maximum channel gain to transmit the information. We derive a closed-form expression of the bit error rate (BER) of the considered FSO system in the presence of a jammer. We extract the analytical coding gain and diversity order from the asymptotic behavior of the derived BER. We show that the transmit aperture selection allows the FSO system corrupted by a jammer to attain a diversity order of 0.5 N, equal to that of a multiple-input single-output FSO system, while appreciably reducing the power requirements of (N − 1) transmitters. The theoretical analysis is verified by simulations. We also make a quantitative comparison with repetitive coding (RC) and optical space shift keying (OSSK) and show that the transmit aperture selection has a 3 dB advantage over RC; moreover, for a 2×1 system, it provides twice the diversity offered by OSSK. The tenacity of aperture selection is also studied numerically for Gamma-Gamma fading FSO channels.
Highlights
The past few years have witnessed enormous attention from academia and industry to free-space optical (FSO) communication
This is an exhaustive expression of average BER (ABER) for an N × 1 multiple-input single-output (MISO)-FSO system employing transmit aperture selection, suffering from a jammer and Gaussian noise, while both the legitimate transmitter and the jammer experience channel fading due to saturated atmospheric turbulence (AT) and pointing error (PE) conditions
This section illustrates the impact of aperture selection on the error performance of an MISO-FSO system, transmitting on-off keying (OOK) signals from N user transmitters, and under attack from a jammer; the legitimate signals and jamming signal suffer from channel fading following negative exponential statistics with PE
Summary
The past few years have witnessed enormous attention from academia and industry to free-space optical (FSO) communication. Transmit aperture (LEDs/LASERs) selection is an attractive low-cost and low-complexity spatial diversity technique that can significantly increase the quality of the received signal and enhance the immunity to turbulence-induced fading in FSO systems [8,9]. In this technique, a single transmit aperture, which experiences the maximum channel gain, is selected for uncoded transmission during a transmission interval; all other apertures are kept inactive [10]. The transmit aperture selection technique has not been studied so far for an FSO system under the attack of a jammer.
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