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A channel information feedback method, a precoding method, a receiving station, and a sending station

A channel information feedback, precoding technology, applied to the shaping network in the transmitter/receiver, error prevention/detection through diversity reception, spatial transmit diversity, etc., can solve problems such as performance loss

Inactive Publication Date: 2014-10-15
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, although the above-mentioned 3GPP LTE channel information feedback method reduces the channel information feedback overhead, it has about 10% performance loss compared to the subband-based adaptive RI and PMI feedback method in terms of system throughput

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  • A channel information feedback method, a precoding method, a receiving station, and a sending station
  • A channel information feedback method, a precoding method, a receiving station, and a sending station
  • A channel information feedback method, a precoding method, a receiving station, and a sending station

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Embodiment Construction

[0076] Considering that in the frequency domain, the channel changes slowly, so there is a certain correlation between the channels on the adjacent subbands, and when the channels have correlation, for the channels on the adjacent subbands, the receiving station from the code The precoding matrix (corresponding to one RI / PMI) selected in this paper will also have certain correlation.

[0077] In a channel information feedback method, a receiving station, and a sending station according to an embodiment of the present invention, for a predefined first RI / PMI set (including multiple RI / PMI elements, RI / PMI is composed of one RI and one PMI pair), where each RI / PMI corresponds to a matrix used for precoding, and any RI / PMI in the first RI / PMI set has a corresponding second a RI / PMI set, the second RI / PMI set being a proper subset of the first RI / PMI set;

[0078] At the same time, when the receiving station selects a first RI / PMI for the current subband, the probability that the...

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Abstract

The invention provides a channel information feedback method, a precoding method, a receiving station and a sending station. The channel information feedback method comprises the following steps of: saving a first set and a second set which corresponds to each element in the first set in advance; taking a first subband in a subband sequence which consists of all subbands of the current data frame or partial continuous subbands as an initial subband, and selecting an RI / PMI for the initial subband from the first set by the receiving station; for each subband except the initial subband, selecting an RI / PMI from the second set which corresponds to the RI / PMI selected for the previous adjacent subband by the receiving station, and determining the index of the selected RI / PMI in the second set which corresponds to the RI / PMI selected for the previous adjacent subband; and feeding back the RI / PMI of the initial subband and the index which corresponds to each of the other subbands from the receiving station to the sending station. The invention reduces the feedback overhead during precoding and improves the system performance.

Description

technical field [0001] The present invention relates to a mobile communication system, in particular to a channel information feedback method, a precoding method, a receiving station and a sending station in a SU-MIMO (Single User Multi-Input Multi-Output) communication system. Background technique [0002] Multi-antenna technology is a key technology in the next generation of mobile communication. In order to improve the throughput of SU-MIMO communication system, precoding technology is widely used in SU-MIMO communication system. [0003] When the precoding technology is used in the SU-MIMO communication system, a BS (Base Station, base station) needs to obtain channel information of a channel between the base station and a UE (User Equipment, user equipment). [0004] However, in an FDD (Frequency Division Duplex, Frequency Division Duplex) system, the feedback overhead of channel information must be fully considered, and the codebook (CodeBook)-based precoding technolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L25/03H04B7/04
Inventor 王玮张战加山英俊
Owner NTT DOCOMO INC