Performance of Transmit Aperture Selection to Mitigate Jamming

Applied Sciences

Manav R. Bhatnagar¹  Isha Chauhan¹ 

[1] Department of Electrical Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India;

关键词: aperture selection;    bit error rate (BER);    jamming;    multiple-input single-output (MISO);    negative-exponential fading;    pointing error (PE);   

DOI  :  10.3390/app12042228

来源: DOAJ

【 摘 要 】

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 $N\times 1$ 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 $2\times 1$ system, it provides twice the diversity offered by OSSK. The tenacity of aperture selection is also studied numerically for Gamma-Gamma fading FSO channels.

【 授权许可】

Unknown