RIS-Aided Interference Cancellation for Joint Device-to-Device and Cellular Communications
arxiv(2023)
摘要
Joint device-to-device (D2D) and cellular communication is a promising
technology for enhancing the spectral efficiency of future wireless networks.
However, the interference management problem is challenging since the operating
devices and the cellular users share the same spectrum. The emerging
reconfigurable intelligent surfaces (RIS) technology is a potentially ideal
solution for this interference problem since RISs can shape the wireless
channel in desired ways. This paper considers an RIS-aided joint D2D and
cellular communication system where the RIS is exploited to cancel interference
to the D2D links and maximize the minimum signal-to-interference plus noise
(SINR) of the device pairs and cellular users. First, we adopt a popular
alternating optimization (AO) approach to solve the minimum SINR maximization
problem. Then, we propose an interference cancellation (IC)-based approach
whose complexity is much lower than that of the AO algorithm. We derive a
representation for the RIS phase shift vector which cancels the interference to
the D2D links. Based on this representation, the RIS phase shift optimization
problem is transformed into an effective D2D channel optimization. We show that
the AO approach can converge faster and can even give better performance when
it is initialized by the proposed IC solution. We also show that for the case
of a single D2D pair, the proposed IC approach can be implemented with limited
feedback from the single receive device.
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