English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We study a novel communication mechanism, ambient backscatter, that utilizesradio frequency (RF) signals transmitted from an ambient source as both energysupply and information carrier to enable communications between low-powerdevices. Different from existing non-coherent schemes, we here design thesemi-coherent detection, where channel parameters can be obtained from unknowndata symbols and a few pilot symbols. We first derive the optimal detector forthe complex Gaussian ambient RF signal from likelihood ratio test and computethe corresponding closed-form bit error rate (BER). To release the requirementfor prior knowledge of the ambient RF signal, we next design a suboptimalenergy detector with ambient RF signals being either the complex Gaussian orthe phase shift keying (PSK). The corresponding detection thresholds, theanalytical BER, and the outage probability are also obtained in closed-form.Interestingly, the complex Gaussian source would cause an error floor while thePSK source does not, which brings nontrivial indication of constellation designas opposed to the popular Gaussian-embedded literatures. Simulations areprovided to corroborate the theoretical studies.

Semi-coherent Detection and Performance Analysis for Ambient Backscatter System