On Secure Mixed RF-FSO Systems With TAS and Imperfect CSI
| Autor: | Ki-Hong Park, Haolun Luo, Weijia Lei, Gaofeng Pan, Mohamed-Slim Alouini, Imran Shafique Ansari, Hongjiang Lei |
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| Rok vydání: | 2020 |
| Předmět: |
FOS: Computer and information sciences
Computer science Information Theory (cs.IT) Computer Science - Information Theory Cumulative distribution function 020206 networking & telecommunications Throughput Nakagami distribution 02 engineering and technology Topology law.invention 020210 optoelectronics & photonics Channel state information Relay law 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Decoding methods Computer Science::Cryptography and Security Computer Science::Information Theory Communication channel |
| Zdroj: | IEEE Transactions on Communications. 68:4461-4475 |
| ISSN: | 1558-0857 0090-6778 |
| Popis: | In this work, we analyze the secrecy outage performance of a dual-hop relay system composed of multiple-input-multiple-output radio-frequency (RF) links and a free-space optical (FSO) link while a multiple-antenna eavesdropper wiretaps the confidential information by decoding the received signals from the resource node. The channel state information (CSI) of the RF and FSO links is considered to be outdated. We propose three transmit antenna selection (TAS) schemes to enhance the secrecy performance of the considered systems. The secrecy outage performance with different TAS schemes is analyzed and the effects of misalignment and detection technology on the secrecy outage performance of mixed systems are studied. We derive the closed-form expressions for probability density function (PDF) and cumulative distribution function (CDF) over M\'alaga channel with imperfect CSI. Then the closed-form expressions for the CDF and PDF of the equivalent signal-to-noise ratio (SNR) at the legitimate receiver over Nakagami-$m$ and M\'alaga channels are derived. Furthermore, the lower bound of the secrecy outage probability (SOP) with different TAS schemes are derived. Besides, the asymptotic results for SOP are investigated by exploiting the unfolding of Meijer's $G$-function when the electrical SNR of FSO link approaches infinity. Finally, Monte-Carlo simulation results are presented to testify the correctness of the proposed analysis. The results illustrate that the outdated CSI shows a strong effect on the secrecy outage performance. In addition, increasing the number of antennas at the source cannot significantly enhance the secrecy performance of the considered systems. Comment: 14 pages, to appear in the IEEE Transactions on Communications |
| Databáze: | OpenAIRE |
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