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Method and system for spatial channel state information feedback for multiple-input multiple-output (MIMO)

A space and channel technology, applied in the field of space CSI feedback, which can solve a large number of baseband processing problems

Inactive Publication Date: 2014-02-26
ZTE CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This large size book (2 15 =3278 entries) are challenging to design and store, and the codeword search will require significant baseband processing

Method used

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  • Method and system for spatial channel state information feedback for multiple-input multiple-output (MIMO)
  • Method and system for spatial channel state information feedback for multiple-input multiple-output (MIMO)
  • Method and system for spatial channel state information feedback for multiple-input multiple-output (MIMO)

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Embodiment Construction

[0019] The method and system set forth below provide an efficient way for accurately feeding back the spatial CSI of uncorrelated MIMO channels, especially when the MIMO rank number per user is equal to or greater than 2. The method and system can be used with mobile devices having single or multiple receive antennas.

[0020] The spatially discriminative information for each transmit antenna segment at the receiver side can be derived directly from the spatial channel (explicit feedback), for example, by singular value decomposition (SVD), or take into account the implementation of the receiver (implicit feedback). Implicit feedback assumes specific receiver processing and usually takes the form of a precoding matrix indicator (PMI) or an enhanced version. Explicit feedback attempts to "objectively" capture spatial channel characteristics without considering receiver processing. The spatial channel is measured from the Channel State Information Reference Channel (CSI-RS). C...

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Abstract

A method and system for feedback of spatial CSI of a spatial channel that connects receive antennas at user equipment and multiple transmit antennas. Spatial discrimination information is provided as feedback at the transmitter and the receiver connecting the user equipment and a cell. With the user equipment providing the transmitter and the receiver side spatial discrimination information of each sub-channel as feedback, the composite spatial CSI over multiple segments of transmit antennas can be determined. The user equipment may have one or multiple receiving antennas, and the spatial discrimination information can be subband short- term. In some embodiments, the spatial discrimination information at the receiver side is derived from the actual spatial channel while receiver implementation is taken into account. The spatial discrimination information at the transmitter and at the receiver can be can be provided as feedback using codebooks for MIMO precoding.

Description

technical field [0001] The field of the present invention relates to feedback spatial channel state information (CSI) of downlink MIMO technology. In particular, the field of the invention relates to spatial CSI feedback utilizing element-wise quantized feature vectors. Background technique [0002] MIMO technology can significantly increase data throughput at the link layer, the system layer, or both the link layer and the system layer. Spatial multiplexing and beamforming have been used to increase spectral efficiency and data throughput. Spatial multiplexing directly improves link layer data throughput and peak rate by multiplexing data streams of the same user via parallel channels. Spatial multiplexing is most effective for both transmit and receive antennas when the spatial correlation between the antennas is low. Beamforming or precoding increases the signal-to-interference-noise ratio (SINR) of the channel, thereby increasing the channel rate. Precoding involves ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04B7/04
CPCH04B7/0663H04B7/0626H04B7/0413H04B7/04H04W24/10H04B7/0417H04L25/0248H04L25/03955
Inventor 袁弋非霍大卫
Owner ZTE CORP
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