%0 Journal Article %@ 2162-2337 %A Ghadi, Farshad Rostami %A Kaveh, Masoud %A Wong, Kai-Kit %A Zhang, Yangyang %D 2024 %F discovery:10194089 %I Institute of Electrical and Electronics Engineers (IEEE) %J IEEE Wireless Communications Letters %K Backscatter communication, correlated fading channel, fluid antenna system, outage probability %T Performance Analysis of FAS-Aided Backscatter Communications %U https://discovery.ucl.ac.uk/id/eprint/10194089/ %X In this letter, we study the performance of backscatter communications (BC) over the position-flexible fluid antenna system (FAS) technology. We consider a situation where a single fixed-antenna source sends information to a FAS reader through the wireless forward (i.e., source-to-tag) and backscatter (i.e., tag-to-reader) channels. We first derive the cumulative distribution function (CDF) of the equivalent channel at the FAS receiver, and obtain closed-form expressions for the outage probability (OP) and the delay outage rate (DOR) assuming a correlated Rayleigh distribution. To gain more insights into the system performance, we present analytical expressions of the diversity order, OP and DOR in the high signal-to-noise ratio (SNR) regime. Numerical results reveal that FAS at the reader can significantly improve the performance of BC compared with a fixed-antenna reader. %Z This version is the author-accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.