Apparatus and method for transmitting channel sounding signal in wireless communication system
AssigneesSamsung Electronics Co., Ltd., Korea University Industrial & Academic Collaboration Foundation
InventorsKeun-Chul Hwang, Sung-Ho Lee, Soon-Young Yoon, In-Kyu Lee, Seok-Hwan Park
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Abstract
Provided is an apparatus and method for transmitting a channel sounding signal from a user terminal in a multiple antenna system. In the method, a channel for each of a plurality of antennas is estimated. The receiving signal power of each of the antennas is calculated using the channel information obtained through the channel estimation. The antenna with the highest RX signal power is selected. Therefore, it is possible to enhance the signal reception performance of the user terminal.
Claims21
A method for transmitting a channel sounding signal from a user terminal in a multiple antenna system, the method comprising:
- estimating a channel for each of a plurality of antennas in the user terminal;
- calculating a receiving (RX) signal power of each of the antennas by using a channel matrix of a downlink and a beamforming weight based on channel information obtained through the channel estimation;
- selecting an antenna to transmit the channel sounding signal to a base station based on the calculated RX signal power of each of the antennas, the selected antenna having a highest RX signal power among the antennas;
- and
- transmitting the channel sounding signal to the base station through the selected antenna,
- wherein the antenna with the highest RX signal power is selected using the following equation:
- k
- =
- arg max
- i
- =
- 1
- ,
- …
-
- ,
- M
- r
-
-
- Hw
- i
-
- 2
- where Mr denotes a total number of antennas of the user terminal, wi denotes the beamforming weight of an ith antenna, H denotes the channel matrix, and ∥Hwi∥2 denotes the RX signal power of the ith antenna which is calculated using the channel matrix H and the beamforming weight wi of the ith antenna.
An apparatus for transmitting a channel sounding signal from a user terminal in a multiple antenna system, the apparatus comprising:
- a channel estimator configured to estimate a channel for each of a plurality of antennas in the user terminal;
- a receiving (RX) signal power calculator configured to calculate a RX signal power of each of the antennas by using a channel matrix of a downlink and a beamforming weight based on channel information obtained through the channel estimation;
- an antenna selector configured to select an antenna to transmit the channel sounding signal to a base station based on the calculated RX signal power of each of the antennas, the selected antenna having a highest RX signal power among the antennas;
- and
- a transmitting TX/RX switch configured to transmit the channel sounding signal to the base station through the selected antenna,
- wherein the antenna selector is configured to select the antenna using the following equation:
- k
- =
- arg max
- i
- =
- 1
- ,
- …
-
- ,
- M
- r
-
-
- Hw
- i
-
- 2
- where Mr denotes a total number of antennas of the user terminal, wi denotes the beamforming weight of an ith antenna, H denotes the channel matrix, and ∥Hwi∥2 denotes the RX signal power of the ith antenna which is calculated using the channel matrix H and the beamforming weight wi of the ith antenna.
A method for transmitting a channel sounding signal from a user terminal in a multiple antenna system, the method comprising:
- estimating a channel for each of a plurality of antennas in the user terminal using a downlink signal received using the each antenna;
- calculating a receiving (RX) signal power of each of the antennas by using a channel matrix of a downlink and a beamforming weight based on channel information obtained through the channel estimation;
- selecting an antenna to transmit the channel sounding signal to a base station based on the calculated RX signal power of each of the antennas, the selected antenna having a highest RX signal power among the antennas;
- and
- transmitting the channel sounding signal to the base station through the selected antenna, wherein the antenna with the highest RX signal power is selected using the following equation:
- k
- =
- arg max
- i
- =
- 1
- ,
- …
-
- ,
- M
- r
-
-
- Hw
- i
-
- 2
- where Mr denotes a total number of antennas of the user terminal, wi denotes the beamforming weight of an ith antenna, H denotes the channel matrix, and ∥Hwi∥2 denotes the RX signal power of the ith antenna which is calculated using the channel matrix H and the beamforming weight wi of the ith antenna.
An apparatus for transmitting a channel sounding signal from a user terminal in a multiple antenna system, the apparatus comprising:
- a channel estimator configured to estimate a channel for each of a plurality of antennas in the user terminal using a downlink signal received using the each antenna;
- a receiving (RX) signal power calculator configured to calculate a RX signal power of each of the antennas by using a channel matrix of a downlink and a beamforming weight based on channel information obtained through the channel estimation;
- an antenna selector configured to select an antenna to transmit the channel sounding signal to a base station based on the calculated RX signal power of each of the antennas, the selected antenna having a highest RX signal power among the antennas;
- and
- a transmitting TX/RX switch configured to transmit the channel sounding signal to the base station through the selected antenna,
- wherein the antenna selector is configured to select the antenna using the following equation:
- k
- =
- arg max
- i
- =
- 1
- ,
- …
-
- ,
- M
- r
-
-
- Hw
- i
-
- 2
- where Mr denotes a total number of antennas of the user terminal, wi denotes the beamforming weight of an ith antenna, H denotes the channel matrix, and ∥Hwi∥2 denotes the RX signal power of the ith antenna which is calculated using the channel matrix H and the beamforming weight wi of the ith antenna.
Dependencies are inferred from the claim text.