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In this paper, we propose a two-bit reconfigurable intelligent surface(RIS)-aided communication system, which mainly consists of a two-bit RIS, atransmitter and a receiver. A corresponding prototype verification system isdesigned to perform experimental tests in practical environments. The carrierfrequency is set as 3.5GHz, and the RIS array possesses 256 units, each ofwhich adopts two-bit phase quantization. In particular, we adopt aself-developed broadband intelligent communication system 40MHz-Net (BICT-40N)terminal in order to fully acquire the channel information. The terminal mainlyincludes a baseband board and a radio frequency (RF) front-end board, where thelatter can achieve 26 dB transmitting link gain and 33 dB receiving link gain.The orthogonal frequency division multiplexing (OFDM) signal is used for theterminal, where the bandwidth is 40MHz and the subcarrier spacing is 625KHz.Also, the terminal supports a series of modulation modes, including QPSK, QAM,etc.Through experimental tests, we validate a few functions and properties ofthe RIS as follows. First, we validate a novel RIS power consumption model,which considers both the static and the dynamic power consumption. Besides, wedemonstrate the existence of the imaging interference and find that two-bit RIScan lower the imaging interference about 10 dBm. Moreover, we verify that theRIS can outperform the metal plate in terms of the beam focusing performance.In addition, we find that the RIS has the ability to improve the channelstationarity. Then, we realize the multi-beam reflection of the RIS utilizingthe pattern addition (PA) algorithm. Lastly, we validate the existence of themutual coupling between different RIS units.

Two-Bit RIS-Aided Communications at 3.5GHz: Some Insights from the Measurement Results Under Multiple Practical Scenes