Distributed IRSs Always Benefit Every Mobile Operator
CoRR(2024)
摘要
We investigate the impact of multiple distributed intelligent reflecting
surfaces (IRSs), which are deployed and optimized by a mobile operator (MO), on
the performance of user equipments (UEs) served by other co-existing
out-of-band (OOB) MOs that do not control the IRSs. We show that, under
round-robin scheduling, in mmWave frequencies, the ergodic sum spectral
efficiency (SE) of an OOB MO is monotonic in the total number of IRS elements
with a pre-log factor that depends on the channel properties of the OOB UE. We
further show that the maximum achievable SE of OOB MO scales log-linearly in
IRS elements. Then, by specifying the minimum number of IRSs as a function of
the channel parameters, we design a distributed IRS system in which an OOB MO
almost surely obtains the maximum SE. Finally, we prove that the outage
probability at an OOB UE decreases exponentially in the number of IRSs, even
though they are randomly configured from the UE's viewpoint. We numerically
verify our theory and conclude that distributed IRSs always help every MO, but
the MO controlling the IRSs benefits the most.
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