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Channel state information acquisition state, channel state information feedback method and apparatus

A technology of channel state information and channel estimation, which is applied in transmission path sub-channel allocation, wireless communication, signaling allocation, etc., can solve the problems of large-scale MIMO systems without CSI feedback technology solutions, and achieve the effect of simplified design and implementation

Active Publication Date: 2016-12-07
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there is no technical solution for CSI feedback and acquisition for massive MIMO systems

Method used

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  • Channel state information acquisition state, channel state information feedback method and apparatus
  • Channel state information acquisition state, channel state information feedback method and apparatus
  • Channel state information acquisition state, channel state information feedback method and apparatus

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Embodiment Construction

[0034] In the embodiment of the present invention, an Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) system is taken as an example for description, such as an LTE-Advanced system. Unless otherwise specified, all descriptions are for one subcarrier. In the embodiment of the present invention, lowercase bold letters represent column vectors, uppercase bold letters represent matrices, Indicates the Kronecker product, the superscript "T" indicates the transpose of a matrix or vector, and the superscript "H" indicates the conjugate transpose of a matrix or vector.

[0035] Such as figure 1 As shown, a method for acquiring channel state information provided by an embodiment of the present invention includes:

[0036] Step 101: The network device receives the CSI fed back by the terminal, wherein the CSI includes at least first-level precoding matrix indication information, and the first-level precoding matrix indication information is...

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Abstract

The invention discloses a channel state information acquisition state, a channel state information feedback method and an apparatus. The channel state information feedback method comprises the steps that: a terminal carries out channel estimation according to received pilot signals to obtain channel estimated values of A antenna ports, wherein the A antenna ports are A antenna ports of network equipment, which send the pilot signals; the terminal determines Q antenna ports according to the channel estimated values of the A antenna ports, wherein Q is smaller than or equal to A and greater than or equal to L, L is a value of RI (Rank Indication) adopted when the network equipment sends downlink data to the terminal, or L is a value of channel RI determined by the terminal; and the terminal determines a first level of pre-coding matrix indication information according to the Q antenna ports and feeds back CSI (Channel State Information) comprising the first level of pre-coding matrix indication information to the network equipment, wherein the first level of pre-coding matrix indication information is used for indicating indexes of the Q antenna ports in the A antenna ports which send the pilot signals.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a channel state information acquisition method, a channel state information feedback method and a device. Background technique [0002] In the existing multiple-input multiple-output (MIMO, Multi-input Multi-output) antenna system based on Frequency Division Duplexing (FDD, Frequency Division Duplexing), the number of antennas in the network equipment is relatively small, and it is not a problem for the terminal to measure the complete MIMO channel matrix . A pilot used for measuring channel state information (CSI, Channel State Information) usually configures an antenna port (antennaport) for each antenna to transmit a pilot signal. [0003] In the LTE-Advanced (LTE-Advanced is the evolution of LTE, LTE is the English abbreviation of Long Term Evolution, Chinese is long-term evolution) system, the pilot used to measure CSI is called reference signal, including cell refer...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/04H04L25/02
CPCH04B7/0469H04B7/0478H04B7/0639H04B7/0658H04B7/0691H04B7/0456H04B7/0626H04B7/0632H04B7/0634H04B17/336H04L5/0057H04W24/10
Inventor 苏昕
Owner DATANG MOBILE COMM EQUIP CO LTD
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