Reconfigurable Intelligent Surface (RIS) can intelligently control the wireless propagation environment by adjusting the signal phase and amplitude in real time, which is considered as one of the key technologies of 6G. Although RIS-assisted wireless communication systems greatly improve transmission efficiency under ideal conditions, there are various uncertainties in actual communication systems. In this paper, RIS-assisted communication system is investigated where the RIS cannot completely eliminate the phase error and the user location is randomly distributed with uncertainty. In addition, there are some interference sources around the user, which are simplified as co-channel interference (CCI). Then we study the performance of RIS-assisted communication system, and derive the closed-form expressions for the outage probability (OP) and channel capacity of the system. Furthermore, we analyze the effects of various parameters on the OP and channel capacity. Finally Monte Carlo simulation is carried out which verify the accuracy of the derivation.INDEX TERMS Reconfigurable intelligent surface, Co-channel interference, Outage probability, Channel capacity.
This article discusses the condition of the information flow network under the premise of local information flow and without information losses in the process of flow, and studies the structure characteristic of equilibrium network. It gives theorem of equilibrium network architecture characteristic to the two kinds of typical core-periphery architecture network.
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