Abstract
This study analyzes a method to improve the performance of an ambient backscatter communication system by exploiting the existing radio frequency(RF) signals in cognitive radio environments. More specifically, we propose a power-beacon-assisted method based on spectrum sensing, which determines an operation mode according to the sensing results of a primary system generating the existing RF signals. Through this power beacon, the secondary system transmits using the RF signals of the primary system when it is active, whereas the secondary power beacon works as the RF source and the secondary system transmits using this signal when the primary system is inactive. The proposed method is evaluated based on the bit error and achievable data rates through extensive simulations and is shown to provide significant performance improvement compared to the conventional scheme without the power beacon.
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