2016/08/09 by Marzieh Najafi, Vahid Jamali, Najafi, Marzieh +3 · 1 citation
Engineering · #FOS: Computer and information sciences #Full-Duplex Wireless Communications #Information Theory (cs.IT) #Optical Wireless Communication Technologies #Satellite Communication Systems
paper · pdf · doi:10.48550/arxiv.1608.02866
openalex publication_date 2016/08/09 · openalex created_date 2022/10/01 · openalex updated_date 2026/07/28
Hybrid radio frequency (RF)/free space optical (FSO) systems are among the\ncandidate enabling technologies for the next generation of wireless networks\nsince they benefit from both the high data rates of the FSO subsystem and the\nhigh reliability of the RF subsystem. In this paper, we focus on the problem of\nthroughput maximization in the parallel hybrid RF/FSO relay channel. In the\nparallel hybrid RF/FSO relay channel, a source node sends its data to a\ndestination node with the help of multiple relay nodes. Thereby, for a given\nrelay, the source-relay and the relay-destination FSO links are orthogonal with\nrespect to each other due to the narrow beam employed for FSO transmission,\nwhereas, due to the broadcast nature of the RF channel, half-duplex operation\nis required for the RF links if self-interference is to be avoided. Moreover,\nwe consider the two cases where the relays are and are not equipped with\nbuffers. For both cases, we derive the optimal relay selection policies for the\nRF and FSO links and the optimal time allocation policy for transmission and\nreception for the RF links. The proposed optimal protocols provide important\ninsights for optimal system design. Since the optimal buffer-aided (BA) policy\nintroduces an unbounded end-to-end delay, we also propose a suboptimal BA\npolicy which ensures certain target average delays. Moreover, we present\ndistributed implementations for both proposed optimal protocols. Simulation\nresults demonstrate that a considerable gain can be achieved by the proposed\nadaptive protocols in comparison with benchmark schemes from the literature.\n