Distributed RF-Emitter Power Allocation for BiBC

In a large area such as a warehouse, using a bistatic backscatter network of passive tags for coverage brings up the issue of insufficient energy harvested by the tags, resulting in poor communication performance. To overcome this problem, we propose a solution that involves the use of distributed radio frequency emitters in a cell-free architecture to deliver more power to the tags. Our approach optimizes the emitter power allocation coefficients while ensuring the tags' energy harvesting requirements are met. By doing so, we provide the same rate quality for all tags and mitigate the effect of the tags' spatial distribution. Compared to the equal-power benchmark, our algorithm yields significant improvements. For example, it achieves
$\sim 51\%$
and
$\sim 16\%$
gains in harvested power and tag rate, respectively, for 0 dBm and 20 dBm with 100 emitters, respectively.