Patent ID: 11863267
Assignee: INDUSTRY ACADEMY COOPERATION FOUNDATION OF SEJONG UNIVERSITY
Field: Digital communication (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 12:
13. A channel estimation method for performing beamforming in a communication system using a single antenna-based standard, the method comprising:
an initial phase delay value setting step of setting phase delay values of all phase shifters configured in a phase shift network as a predetermined initial phase delay value in a transmitter to which the multiple transmission antenna is connected when the communication protocol is started;
a pilot signal generation step of generating a Zadoff-Chu sequence based on a predetermined signal generation parameter, and generating a predetermined number of transmission pilot signals equal to the number of the multiple transmission antennas using the generated Zadoff-Chu sequence; in the transmitter;
a pilot signal transmission step of transmitting the transmission pilot signals generated in the pilot signal generation step to the receiver, in the transmitter;
a frame generation step of generating a frame including predetermined beamforming information and transmitting the generated frame to a multiple transmission antenna through the phase shift network; in the transmitter;
a frame and pilot signal reception step of obtaining beamforming information included in the frame generated by the transmitter in the frame generation step through frame synchronization, and receiving the transmission pilot signals using the obtained beamforming information, in the receiver to which a single reception antenna is connected;
a channel estimation step of generating reception pilot signals based on the received transmission pilot signals and estimating a channel using the transmission and reception pilot signals in the receiver when the beamforming use of the transmitter is confirmed from the beamforming information obtained in the frame and pilot signal reception step;
an optimal precoding vector detection step of detecting an optimal precoding vector to be applied by a transmitter among precoding vectors included in a pre-stored codebook by using the channel information estimated in the channel estimation step, in the receiver;
a codebook number feedback step of feeding back a codebook number corresponding to the optimal precoding vector detected in the optimal precoding vector detection step to the transmitter through a single reception antenna, in the receiver; and
a phase delay value conversion setting step of converting a signal phase of extracting the corresponding precoding vector from the codebook stored in advance using the codebook number fed back from the receiver through the codebook number feedback step, and converting a signal phase of each transmission antenna into a phase delay value corresponding to each transmission antenna included in the extracted precoding vector, in the transmitter.