US 11,967,829 B2
Apparatus and method for estimating channel of wireless power transmission system using intelligent reflecting surface
Chungyong Lee, Seoul (KR); Sangwon Jung, Seoul (KR); and Chaehun Im, Seoul (KR)
Assigned to UIF (University Industry Foundation), Yonsei University, Seoul (KR)
Filed by UIF (University Industry Foundation), Yonsei University, Seoul (KR)
Filed on Mar. 4, 2022, as Appl. No. 17/687,349.
Prior Publication US 2023/0283105 A1, Sep. 7, 2023
Int. Cl. H02J 50/00 (2016.01); H01Q 3/40 (2006.01); H02J 50/40 (2016.01)
CPC H02J 50/001 (2020.01) [H01Q 3/40 (2013.01); H02J 50/40 (2016.02)] 13 Claims
OG exemplary drawing
 
1. A channel estimating apparatus 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 apparatus comprising:
a channel estimating unit configured to estimate 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 the channel estimating unit estimates the transmitting channel and the reflecting surface channel 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 the channel estimating unit estimates the transmitting channel and the reflecting surface channel 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 unit is configured to:
fix the transmitting channel and the reflecting surface channel and update 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;
fix the transmitting channel according to the initial value of the estimating variable set and the updated phase variable and update the reflecting surface channel;
fix the updated phase variable and the updated reflecting surface channel and update the transmitting channel using a successive convex approximation technique; and
determine whether updated variables of the estimating variable set are converged and acquire 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 updated variables of the estimating variable set are converged.