Patent ID: 11967829
Assignee: UIF (UNIVERSITY INDUSTRY FOUNDATION), YONSEI UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. The channel estimating apparatus according to claim 1, wherein the phase variable updating unit updates the phase variable using Equation 1 on the basis of the fixed transmitting channel, the fixed reflecting surface channel, the measuring beamforming vector, the measuring phase shift matrix, and the received signal strength (RSS),

Øk=arg(MGhk),∀k  [Equation 1]

where hk indicates a k-th reflecting surface channel between the intelligent reflecting surface (IRS) and a k-th terminal during L previous time slots,
Øk,
is the phase variable applied to add phase information to the received signal strength (RSS) fed back from the k-th terminal during the L previous time slots, and

MG is a transmitting reflecting channel from the transmission of the transmitter to the reflection of the intelligent reflecting surface (IRS) during a period from a current time slot T to the L previous time slots and is calculated by Equation 2,

MG(T):=[(wH(T−L+1)GθH(T−L+1))T, . . . ,(wH(t)GθH(T))T]T,  [Equation 2]

where w is the measuring beamforming vector, and
θ is the measuring phase shift matrix.