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

Claim 10:
11. A channel estimating method of a wireless power transmission system including a transmitter which transmits a power signal and an intelligent reflecting surface (IRS) which reflects the power signal transmitted from the transmitter to transmit the power signal to a plurality of terminals, the channel estimating method comprising:
estimating a transmitting channel which is a channel between the transmitter and the intelligent reflecting surface (IRS) and a reflecting surface channel which is a channel between the intelligent reflecting surface (IRS) and a terminal, on the basis of a measuring beamforming vector which is generated to allow the transmitter to transmit a measuring signal, a measuring phase shift matrix which is generated to allow the intelligent reflecting surface (IRS) to designate a phase adjustment while reflecting the measuring signal, and a received signal strength (RSS) fed back from the terminal which receives the measuring signal,
wherein in the channel estimating step, the transmitting channel and the reflecting surface channel are estimated by repeatedly performing a process of fixing two variables of an estimating variable set and alternatively updating the remaining variables, on the basis of the estimating variable set including the transmitting channel, the reflecting surface channel, and a phase variable representing a phase of the measuring signal received from the terminal,
wherein in the channel estimating step, the transmitting channel and the reflecting surface channel are estimated until values of the variables of the estimating variable set are converged within a predetermined range, on the basis of an initial value of the estimating variable set, and
wherein the channel estimating step includes:
fixing the transmitting channel and the reflecting surface channel and updating the phase variable by means 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), on the basis of the initial value of the estimating variable set;
fixing the transmitting channel according to the initial value of the estimating variable set and the updated phase variable and updating the reflecting surface channel;
fixing the updated phase variable and the updated reflecting surface channel and updating the transmitting channel using a successive convex approximation technique; and
determining whether the updated variables of the estimating variable set are converged and acquiring the reflecting surface channel and the transmitting channel according to the updated estimating variable set as estimating channel information when it is determined that the variables are converged.