Abstract
In this paper, we build up a new intelligent reflecting surface (IRS) aided multiple-input multiple-output (MIMO) channel model, named the cascaded line-of-sight (LoS) MIMO channel. The proposed channel model consists of a transmitter (Tx) and a receiver (Rx) both equipped with uniform linear arrays (ULAs), and an IRS used to enable communications between the Tx and the Rx through the LoS links seen by the IRS. To model the reflection of electromagnetic waves at the IRS, we take into account the curvature of the wavefront on different reflecting elements (REs), which is distinct from most existing works with the plane-wave assumption. Based on the established model, we study the spatial multiplexing capability of the cascaded LoS MIMO system. We come up with the notion of full multiplexing region (FMR), which is the union of Tx-IRS and IRS-Rx distance pairs that enable full multiplexing communication over the cascaded LoS MIMO system. We also derive an inner bound of the FMR under a specific passive beamforming strategy named reflective focusing.
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