  Recognising the limitations of various existing channel-estimation schemes
for energy beamforming, we propose an energy-preserving indirect feedback-based
approach for finding the optimal beamforming vector. Upon elaborating on the
key ideas behind the proposed approach -- dynamics of the harvest-then-transmit
protocol and the latency associated with the charging process -- we present an
algorithm and its hardware architecture to concretise the proposed approach.
The algorithm and the hardware architecture are supplemented by mathematical
analysis, numerical simulation and hardware utilisation details, ASIC synthesis
and post-layout simulation details, respectively. We firmly believe this paper,
due to its unified algorithm-hardware design, will open up new avenues for
research in radio frequency (RF) wireless power transfer.
