Method and apparatus for sending and receiving channel state information in multiple-input multiple-output network wireless communication systems
AssigneesSamsung Electronics Co., Ltd., Industry-Academic Cooperation Foundation, Yonsei University
InventorsIn Ho Lee, Cheol Mun, Ju Ho Lee, Jin Kyu Han, Jong Gwan Yook
Life of this patent
Estimating the term…
Abstract
A method and an apparatus for sending and receiving channel state information in network Multiple-Input Multiple-Output (MIMO) wireless communication systems are provided. Hybrid feedback technology is provided to transfer complete Channel State Information (CSI) to a transmitter by efficiently combining limited amounts of long-term channel information and short-term channel information are in a down link MIMO network system.
Claims16
A method for sending channel state information of a terminal in a network Multiple-Input Multiple Output (MIMO) system having a plurality of base stations and the terminal, comprising:
- estimating a down link channel from a signal received from the base station;
- extracting long-term channel information from the extracted down link channel being in a state of a down link channel which does not instantaneously change every frame and sending the long-term channel information through a long-term feedback channel divided and allocated into plural frames;
- and
- extracting short-term channel information from the extracted down link channel being a state of a down link channel instantaneously changes every frame and sending the short-term channel information through a short-term feedback channel allocated every frame.
A method for receiving channel state information of a network in a network Multiple-Input Multiple Output (MIMO) system having a plurality of base stations and the terminal, comprising:
- receiving long-term channel information being a state of a down link channel instantaneously not change every frame through a long-term feedback channel allocated through a plurality of frames by one of the plurality of base stations;
- receiving short-term channel information being a state of a down link channel instantaneously changes every frame to which a short-term feedback channel is allocated by the one base station;
- and
- combining the long-term channel information and the short-term channel information by the one base station to restore a channel matrix indicating a down link channel between the base station and the terminal.
An apparatus for sending channel state information of a terminal in a network Multiple-Input Multiple Output (MIMO) system having a plurality of base stations and the terminal, comprising:
- a transceiver performing data transmission and reception to and from the base station;
- a channel estimator estimating a down link channel from a signal received from the base station;
- a long-term channel information processor extracting long-term channel information from the extracted down link channel being a state of a down link channel not instantaneously change every frame and sending the long-term channel information through a long-term feedback channel divided and allocated into plural frames using the transceiver;
- and
- a short-term channel information processor extracting short-term channel information from the extracted down link channel being a state of a down link channel instantaneously changes every frame and sending the short-term channel information through a short-term feedback channel allocated every frame using the transceiver.
An apparatus for receiving channel state information of a network in a network Multiple-Input Multiple Output (MIMO) system having a plurality of base stations and the terminal, comprising:
- a feedback receiver of one of the plurality of base stations receiving and restoring long-term channel information being a state of a down link channel not instantaneously change every frame through a long-term feedback channel allocated through a plurality of frames, and receiving and restoring short-term channel information being a state of a down link channel instantaneously changes every frame through a short-term feedback channel allocated every frame;
- and
- a channel matrix restoring unit of the one base station combining the long-term channel information and the short-term channel information to restore a channel matrix indicating a down link channel between the base station and the terminal.
Dependencies are inferred from the claim text.