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Switching-Based Transmit Antenna/Aperture Selection in a MISO Hybrid FSO/RF System

In this paper, we propose a switching scheme for a multiple-input-single-output (MISO) hybrid free-space op-tics/radio frequency (FSO/RF) system to switch the transmission between MISO FSO and RF sub-systems. We consider transmit aperture/antenna selection (TAS) scheme for selecting the best antenna/aperture among multiple transmit antennas/apertures. The proposed FSO sub-system transmits through its selected best link as long as the instantaneous signal-to-noise ratio (SNR) at the FSO receiver is greater than the threshold SNR. The system switches to the best link of the RF sub-system when the SNR falls below the threshold value. The outage probability and average symbol error rate (SER) of the proposed hybrid system is extensively analyzed and the results are validated using Monte-Carlo simulations. Asymptotic expressions are derived to obtain the diversity order of the proposed system. Finally, the performance of the MISO hybrid FSO/RF system is compared with the performance of a MISO FSO system to calculate the performance gain obtained using the proposed switching scheme.