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Measurement results of the DDM wireless communication system. (a) The original image to be transmitted. (b) The received image under the 2-bit-symbol transmission mode. (c) The received image when a metal plate is placed between the programmable metasurface and two receiving antennas. (d) The received image after running the channel autoscan program when a metal plate is placed between the programmable metasurface and the two receiving antennas.
