A balanced (+1/-1) backscatter training sequence per ambient symbol cancels direct-link interference, letting retrodirective wireless power transfer focus energy on the backscattering receiver.
Symbol detection of ambient backscatter systems with manchester coding,
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Design of Ambient Backscatter Training for Wireless Power Transfer
A balanced (+1/-1) backscatter training sequence per ambient symbol cancels direct-link interference, letting retrodirective wireless power transfer focus energy on the backscattering receiver.