Opportunistic User Scheduling in RIS-Assisted Multiuser Systems with Phase Errors

In this paper, the performance of opportunistic user scheduling in reconfigurable intelligent surface (RIS)-aided multiuser communications is investigated by invoking 1-bit coding scheme. In particular, we derive new expressions for the outage probability (OP) and delay outage rate (DOR) by leveraging copula theory to model a two-fold interdependency stemming from the presence of discrete phase noise and a shared channel. We also provide simplified expressions for the OP and DOR using Clayton and Gumbel copulas. The newly derived expressions reveal the effects of different channel and RIS parameters simply. Finally, numerical results are provided to validate the derived exact closed-form expressions.