US 11,863,267 B2
Multi-antenna channel estimation apparatus and method for beamforming
Hyoung Kyu Song, Seongnam-si (KR); Won Seok Lee, Seoul (KR); and Ji Sung Jung, Seoul (KR)
Assigned to INDUSTRY ACADEMY COOPERATION FOUNDATION OF SEJONG UNIVERSITY
Filed by INDUSTRY ACADEMY COOPERATION FOUNDATION OF SEJONG UNIVERSITY, Seoul (KR)
Filed on Oct. 13, 2021, as Appl. No. 17/500,918.
Claims priority of application No. 10-2021-0056046 (KR), filed on Apr. 29, 2021.
Prior Publication US 2022/0376755 A1, Nov. 24, 2022
Int. Cl. H04B 7/06 (2006.01); H04B 7/08 (2006.01); H04L 5/00 (2006.01); H04L 25/02 (2006.01)
CPC H04B 7/0617 (2013.01) [H04B 7/086 (2013.01); H04L 5/0048 (2013.01); H04L 25/0202 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A channel estimation apparatus for performing beamforming in a communication system using a single antenna-based standard, the channel estimation apparatus comprising:
a transmitter comprising:
at least two transmission antennas;
a configuration to generate a predetermined number of transmission pilot signals equal to the number of the provided transmission antennas to transmit the generated predetermined number of transmission pilot signals to a receiver;
a configuration to receive phase shift information corresponding to the pilot signals as feedback from the receiver to adjust a signal phase for each transmission antenna using the feed-back phase shift information; and
a receiver comprising:
a single reception antenna;
a configuration to estimate a channel for beamforming based on the transmission pilot signals transmitted from the transmitter;
a configuration to detect an optimal precoding vector to be applied to the transmitter based on the estimated channel information and a pre-stored codebook and to feed back the corresponding phase shift information to the transmitter;
wherein the transmitter further comprises:
a transmission communication module configured to generate a frame including predetermined beamforming information and transmit the generated frame to multiple transmission antennas through a phase shift network;
a pilot signal generation module configured to generate a Zadoff-Chu sequence based on a predetermined signal generation parameter from a transmission control module, and generate a predetermined number of transmission pilot signals equal to the number of transmission antennas provided in the transmitter using the generated Zadoff-Chu sequence;
a signal switching switch control module positioned between the transmission communication module, the pilot signal generation module, and the phase shift network to connect the transmission communication module or the pilot signal generation module to the phase shift network according to the control of the transmission control module;
a phase shift network including phase shifters corresponding to the respective transmission antennas, and configured to transmit an output signal from the transmission communication module or the pilot signal generation module connected through the signal switching switch to the connected multiple transmission antennas;
multiple transmission antennas connected to the phase shifters of the phase shift network and configured to radiate an output signal transmitted from the phase shift network to the receiver; and
a transmission control module configured to obtain phase shift information corresponding to the transmission pilot signals generated in the pilot signal generation module through the control of the transmission communication module, the pilot signal generation module and the signal switching switch from the receiver, and adjust the phase delay of each signal of the phase shift network using the acquired phase shift information.