Outage Analysis for Tag Selection in Reciprocal Backscatter Communication Systems

Applying tag selection to backscatter networks can greatly improve the system outage performance. In this letter, the analytical expressions on outage probability for both ideal and outdated tag selection in reciprocal backscatter networks are derived with a truncated series expansion. Furthermore, the asymptotic analysis with large transmission power is conducted to give an insight into the effects of system parameters. From the asymptotic analysis, it is found that the diversity order of outage probability for ideal tag selection is equal to half of the number of tags. However, when applying outdated tag selection, the diversity order is equal to one, and thereby no diversity gain can be harvested, regardless of the temporal correlation and the number of tags.