  We present for the first time an experimental demonstration on the energy
allocation of commodity Wi-Fi signals in a programmable and inexpensive way. To
that end, we design an electronically-programmable phase-binary coding
metasurface, working at the 2.4GHz Wi-Fi frequency band, to manipulate
dynamically and arbitrarily the spatial distribution of commodity Wi-Fi
signals. Meanwhile, an efficient algorithm is developed to find the optimal
coding sequence of the programmable metasurface such that the spatial energy of
commodity Wi-Fi signals can be instantly controlled in a desirable way.
Selected experimental results based on an IEEE 802.11n commercial Wi-Fi
protocol have been provided to demonstrate the performance of the developed
proof-of-concept system in enhancing the commodity Wi-Fi signals dynamically
and arbitrarily. It could be expected that the proposed strategy will pave a
promising way for wireless communications, future smart home, and so on.
