A method and device for selecting a precoding matrix

A precoding, linear matrix technology, applied in the direction of error prevention/detection using the return channel, error prevention/detection through diversity reception, etc., can solve problems such as high feedback overhead, no antenna configuration, and no matrix feedback method proposed, Achieving the effect of small feedback overhead and reduced complexity

Active Publication Date: 2011-12-28
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

In addition, Huawei has proposed a quantization method for the spatial correlation matrix of a cross-polarized (clustered) linear array (Cross-polarized Cluster Linear Array, CLA) with 4 transmitters. However, these feedback schemes have not yet utilized the spatial correlation matrix The matrix structure and special antenna configuration, such as co-polarized uniform linear array (Co-polarized Uniform Linear Array, ULA) antenna, CLA antenna
Therefore, the amount of data that needs to be fed back is still large, resulting in high feedback overhead
[0004] Currently, no corresponding correlation matrix feedback method has been proposed for typical antenna configurations using closely spaced CLA antennas

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  • A method and device for selecting a precoding matrix

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Embodiment Construction

[0017] figure 1 A schematic diagram of a network topology structure according to a specific embodiment of the present invention is shown, wherein the base station 1 is located in a MIMO system, therefore, the base station 1 is configured with multiple antennas, and these antennas are closely spaced, that is, the base station The distance between adjacent antennas is less than or equal to 1 / 2 of the signal wavelength (1 / 2λ), and the base station 1 uses a CLA array, that is, a cross-polarized linear array. The user terminal 2 is governed by the base station 1, and the user terminal 2 may be equipped with multiple receiving antennas to provide spatial multiplexing gain.

[0018] figure 2 shows a specific embodiment of the present invention figure 1 The flow chart of the system method of the base station 1 and the user terminal 2 is shown.

[0019] First, in step S10, the base station 1 sends a reference signal (ReferenceSignal) to the user terminal 2 for the user terminal 2 t...

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Abstract

The invention provides a method and a device for selecting a precoding matrix. The characteristics that a gap between adjacent antennae of tightly spaced cross polarization linear array antennae is small, the diagonal elements of a correlation matrix are 1 and the like are fully considered, and a corresponding code book for the quantification and feedback of the correlation matrix is designed, so that high system performance is achieved at low feedback overhead and complexity.

Description

technical field [0001] The present invention relates to a multiple-input multiple-output wireless communication network, in particular to a method and a device for a user terminal to feed back a precoded codeword to a base station. Background technique [0002] It is well known that in a multiple input multiple output (Multiple Input Multiple Output, MIMO) system, knowing the spatial correlation matrix of the transmitting antenna at the transmitting end can significantly improve the system performance. In practical applications, the correlation matrix cannot be known in advance. For example, for a frequency division duplex (Frequency Division Duplex, FDD) system, it is necessary to make the transmitting end know the approximation of the correlation matrix through quantization and feedback. Therefore, the feedback overhead and the accuracy of quantization are the main concerns about correlation matrix feedback in MIMO systems. [0003] In the LTE-A discussion, it is propose...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/16
Inventor 陈晋辉武露宋扬杨红卫吕荻
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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