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Method and system for precoding multi-user multi-input multi-output downlink

A downlink, multiple-input technology used in communications to solve problems such as poor performance

Active Publication Date: 2011-02-02
BEIJING STARPOINT TECH COMPANY
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  • Claims
  • Application Information

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Problems solved by technology

Although the method based on block diagonalization and linear precoding is simple, the performance is relatively poor

Method used

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  • Method and system for precoding multi-user multi-input multi-output downlink

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Embodiment Construction

[0065] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated.

[0066] The present invention is aimed at the situation when each user is configured with multiple antennas in a multi-user MIMO downlink system. In this system, the base station is configured with M antennas, and the kth MS is configured with N k Antennas, there are currently K MSs in total; among them, the number of antennas satisfies the relationship:

[0067] L k ×1 vector Indicates the data symbol vector that the base station will send to the kth mobile station.

[0068] figure 2 A flow chart showing a method for downlink precoding of a multi-user MIMO provided by an embodiment of the present invention is shown.

[0069] Such as figure 2 As shown, the method flow 200 for multi-user MIMO downlink precoding based on block diagonalization and MMSE vector perturbation includes:

[0070]...

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Abstract

The invention discloses a method and a system for precoding a multi-user multi-input multi-output downlink. The method comprises the following steps of: calculating a block diagonalizable precoding matrix by using a channel matrix by a BS (Base Station) to eliminate MUI (Multi-User Interference); obtaining an equivalent channel matrix at the same time; eliminating the precoding matrix of ISI (Data Stream Interference) as a MMSE (Minimum Mean Square Error) precoding matrix aiming at an equivalent channel; carrying out Cholesky decomposition, and carrying out MMSE vector disturbance on a data symbol vector according to a decomposition result; carrying out the left multiplication of disturbed vector on the obtained matrix cascade; summing the obtained K results; then, transmitting the obtained K results from an antenna terminal; carrying out the module taking operation on the received signals by an MS (Mobile Station) terminal; and estimating initial data. On the basis of a precoding technology of block diagonalization and MMSE vector disturbance, the method and the system for precoding the multi-user multi-input multi-output downlink do not need a mobile station to estimate an equivalent channel or do not need the base station to transmit collaborative information, thereby greatly reducing system overhead and a receiver structure and eliminating the MUI interference while ensuring system performance.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a multi-user MIMO (Multi Input Multi Output) downlink precoding based on block diagonalization and minimum mean square error (MMSE, Minimum Mean Square Error) vector perturbation methods and systems. Background technique [0002] The multi-user MIMO downlink is that a base station (BS, BaseStation) configured with multiple antennas communicates with multiple mobile stations (MS, Mobile Station) on the same frequency at the same time. The MS can be configured with a single antenna or multiple antennas. In a cellular wireless communication system, when both the base station (BS) and the mobile station (MS) are equipped with multiple antennas and the BS communicates with multiple MSs in the same frequency band at the same time, multi-user interference (MUI) and the interference between multiple antennas of the user itself will occur. stream interference (ISI). Sinc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06
Inventor 王滔滔吕铁军
Owner BEIJING STARPOINT TECH COMPANY
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