Optimal power allocation and harvesting duration for mixed RF/FSO using Non Orthogonal Multiple Access

In this paper, we suggest to optimize power allocation coefficients and harvesting duration in mixed Radio Frequency (RF)/Free Space Optical (FS0) communications using Non Orthogonal Multiple Access (NOMA). The system model contains three time slots. In the first time slot, relay node R harvests ene...

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Bibliographic Details
Published in:Optical and quantum electronics 2020-10, Vol.52 (10), Article 442
Main Authors: Ben Halima, Nadhir, Boujemaa, Hatem
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Computer Communication Networks
Electrical Engineering
Free-space optical communication
Lasers
Nodes
Nonorthogonal multiple access
Optical Devices
Optics
Optimization
Photonics
Physics
Physics and Astronomy
Radio frequency
Relay
Symbols
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Summary:In this paper, we suggest to optimize power allocation coefficients and harvesting duration in mixed Radio Frequency (RF)/Free Space Optical (FS0) communications using Non Orthogonal Multiple Access (NOMA). The system model contains three time slots. In the first time slot, relay node R harvests energy from RF signal received from node H . Node H can be any node transmitting RF signals. In the second time slot, an FSO transmitter T transmits a linear combination of symbols of K users to relay node R using NOMA. In the third and last slot, relay R detects the receive symbols and sends a linear combination of detected symbols to K users using NOMA. We show that power allocation and harvesting duration optimization allow to increase the throughput of RF/FSO communications. We consider two users’ ranking techniques using average or instantaneous channel gains.
ISSN:0306-8919
1572-817X
DOI:10.1007/s11082-020-02560-w