Linear pre-coding method in multi-user MIMO system

A linear precoding and multi-input technology, applied in the field of linear precoding, can solve the problems of high computational complexity, low efficiency of linear precoding, and inability to use SVD to decompose and sort processing, and achieve the effect of eliminating shared channel interference

Inactive Publication Date: 2009-03-25
TD TECH COMM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this process, when step 1 and step 2 determine the linear precoding matrix, it is necessary to transmit the matrix H of the interference channel K Carry out SVD decomposition, and the computational complexity of SVD decomposition itself is large, so the linear prec

Method used

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  • Linear pre-coding method in multi-user MIMO system
  • Linear pre-coding method in multi-user MIMO system
  • Linear pre-coding method in multi-user MIMO system

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Embodiment 1

[0053] figure 2 It is a specific flowchart of the linear precoding method in Embodiment 1 of the present invention. Such as figure 2 As shown, the method includes:

[0054] Firstly, the linear precoding matrix of each user is determined. During this process, the method of determining the linear precoding matrix is ​​the same for different users. The determination process of the linear precoding matrix of user k is described below as an example.

[0055] Step 201, the base station determines the interference channel transmission matrix H of user k according to the channel estimation result k .

[0056] In this step, according to channel estimation, the downlink channel transmission matrix H from the base station to each user is obtained k , k=1, 2,..., K, and determine the user's interference channel transmission matrix H k for H ¯ k = [ H ...

Embodiment 2

[0073] image 3 It is a specific flowchart of the linear precoding method in Embodiment 2 of the present invention. Such as image 3 As shown, the method includes:

[0074] Firstly, the linear precoding matrix of each user is determined. During this process, the method of determining the linear precoding matrix is ​​the same for different users. The determination process of the linear precoding matrix of user k is described below as an example.

[0075] Steps 301-302, the base station determines the interference channel transmission matrix Hk of user k according to the channel estimation result; the interference channel transmission matrix Hk of user k k The conjugate transpose matrix of Perform QR decomposition.

[0076] The operations in the above steps 301-302 are the same as the operations in steps 201-202 in the first embodiment, and will not be repeated here.

[0077] In this embodiment, it is assumed that the linear precoding matrix of user k is ...

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Abstract

The invention discloses a linear precoding method in a multiuser multi-input and multi-output (MIMO) system, which comprises the following steps: determining the interference channel transmission matrix HK in the system of each user according to the channel estimation results, wherein, k is user index, k is in the range from 1 to K, and K is the user number served by the system base station simultaneously in the same band range; carrying out the QR decomposition to the conjugate transposed matrix HK<H> of a random user's interference channel transmission matrix HK, and forming the user's linear precoding matrix T<k> according to the QR decomposition result; and carrying out the linear precoding to each user's emission signal s<k> respectively by utilizing the formed linear precoding matrix T<k>.

Description

technical field [0001] The invention relates to the linear precoding technology in the communication technology, in particular to a linear precoding method in a multi-user multiple-input multiple-output (MIMO) system. Background technique [0002] In a multi-user MIMO Orthogonal Frequency Division Multiplexing (OFDM) system, multi-user spatial multiplexing is an important technology to improve wireless spectrum utilization. In a multi-user MIMO system, if the base station uses the same frequency band and the same time slot to communicate with multiple users, and at the same time, there is no channel state information (CSI) that reflects the channel characteristics in the base station, then the shared channel generated between multiple users Interference would be irreversible, and channel sharing among multiple users would be next to impossible. [0003] However, in fact, CSI reflecting channel characteristics can be obtained in various ways, for example, obtaining a channel...

Claims

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Application Information

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IPC IPC(8): H04L1/02H04B7/02
Inventor 王大飞拉盖施薛强
Owner TD TECH COMM TECH LTD
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