6 November 2023
Proposes RIS partitioning to balance assistance and transmission capabilities in symbiotic radio
Derives a detector to decode the composite received signal from primary and secondary signals
Investigates the assistance-transmission tradeoff by minimizing bit error rate of composite signal
Shows optimized RIS partitioning strategy depends on channel strength ratio of direct and reflected links
Demonstrates performance gain over conventional RIS designs through analysis and simulations
Tradeoff between assistance and transmission in RIS-enabled symbiotic radio
This paper studies a symbiotic radio system where a reconfigurable intelligent surface (RIS) acts as a secondary transmitter and simultaneously assists the primary transmission. To balance these dual capabilities, the RIS is partitioned into two sub-surfaces. One sub-surface assists the primary transmission via passive beamforming, while the other sub-surface transmits the secondary signal. A novel detector is proposed to decode the composite received signal. Then the tradeoff between assistance and transmission is investigated by minimizing the bit error rate of the composite signal. Results show the optimized partitioning strategy depends on the channel strength ratio of the direct and reflected links.
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