Deploying more, smaller IRSs improves communication multiplexing but worsens sensing accuracy, and beyond an IRS-element threshold communication-only beamforming is optimal.
Random ISAC signals deserve dedicated precoding,
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Multi-IRS Aided ISAC System: Multi-Path Exploitation Versus Reduction
Deploying more, smaller IRSs improves communication multiplexing but worsens sensing accuracy, and beyond an IRS-element threshold communication-only beamforming is optimal.