Capacity analysis and channel modeling of reconfigurable intelligent surface-assisted OAM communication systems
Research on reconfigurable intelligent surface ( RIS ) assisted orbital angular momentum ( OAM ) communication systems mainly employs free-space propagation channels. However, the channel model fails to accurately describe the propagation characteristics of OAM signals. This paper studies the propagation characteristics of OAM signals in free-space scenarios. Based on our study, the RIS-assisted OAM channel model is built with Rice fading channel. The RIS-assisted OAM communication systems generates OAM signals with different modes by using RIS. Power allocation and RIS passive beam-forming are optimized by a joint optimization algorithm to improve the channel capacity, and the influence of signal-to-noise ratio ( SNR ) and transmission power on channel capacity is analyzed. Our simulation results show the proposed fading channel model describes the propagation character of OAM signals in RIS-assisted channels and achieves higher channel capacity.
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