Can we adopt the cascaded channel model in RIS-assisted system? if yes, what realistic conditions that make the channel matrix between the UT and RIS sparse? or low-rank matrix?
Also, due to the immobility of both RIS and AP, can we say the matrix that describes the channel between AP-RIS is a low-rank matrix?
Walid Ghanem
I think it may be the reverse, since RIS can enhance the rank of the channel. may, no sure.
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Emil Björnson
It depends on what kind of propagation environment that you want to study. The line-of-sight cases are modeled as described in my recent paper:
https://arxiv.org/pdf/2002.04960.pdf
But if there is also scattering, the g and h vectors should be replaced by summations of channel components from different directions and locations of the scatterers.
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