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Characteristic sub-channel-based interference alignment pre-coding matrix optimizing method

A technology of precoding matrix and interference alignment, applied in the direction of preventing/detecting errors through diversity reception, which can solve the problems of not taking into account the signal channel conditions and the system throughput is not optimal, and achieve the effect of high system throughput

Inactive Publication Date: 2010-12-08
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, when this method selects the precoding vectors that make up the precoding matrix, it is randomly selected from the precoding vector set, that is, this method only focuses on dealing with the interference of other cells, and does not take into account The channel conditions experienced by the signal of this cell, so it is not optimal in terms of system throughput

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  • Characteristic sub-channel-based interference alignment pre-coding matrix optimizing method

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Embodiment 1

[0029] This embodiment uses multi-antenna interference channels in three cells, and each cell has only one user as an example; suppose the number of antennas of each base station is M, the number of antennas of each user is M, and M is an even number; Shared channel state information (channel matrix), no data; no information is shared between users; both the base station and the user know accurate channel state information; the channel matrix from the base station in the j cell to the user in the i cell is H ij ; The base station power limit in the j-th cell is P j .

[0030] The design of the base station precoding matrix in this embodiment is carried out as follows:

[0031] Step 1: Obtain a set of precoding vectors according to interference alignment conditions:

[0032] According to the conditions of interference alignment of three-cell multi-antenna system

[0033] span(W 1 )=span(EW 1 )

[0034] W 2 =(H 32 ) -1 H 31 W 1

[0035] W 3 =(H 23 ) -1 H 21 W 1

[0036] Get precoding vecto...

Embodiment 2

[0045] This embodiment uses the method for optimizing the interference alignment precoding matrix based on the characteristic sub-channel of the present invention. When there are multiple users in each cell, how to use time division multiplexing technology, frequency division multiplexing technology or code division multiplexing technology in The method of scheduling only one user in each time slot, each frequency band or each code channel will simplify the processing and explain.

[0046] In the case of multi-antenna interference channels in three cells (represented by cell 1, cell 2, and cell 3) and there are multiple users in each cell, the number of antennas of each base station is M, and the number of antennas of each user is M, and M is an even number; channel state information (channel matrix) is shared between base stations, but no data is shared; no information is shared between users; both the base station and the user know accurate channel state information; the base st...

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Abstract

The invention discloses a characteristic sub-channel-based interference alignment pre-coding matrix optimizing method. The method is characterized by comprising the following steps of: on the basis of interference alignment, performing singular value decomposition on a channel matrix from a base station of the local cell to a user of the local cell to acquire the best group of characteristic sub-channels, selecting a group of pre-coding vectors with the maximum weighted inner product with the best group of characteristic sub-channels from a pre-coding vector set acquired according to the interference alignment condition, and arranging the pre-coding vectors side by side to form the pre-coding matrix, wherein weighting factors are singular values respectively corresponding to the group of singular vectors. The method makes full use of the channel information from the base station to the user of the local cell while taking the alignment with interference of other cells into full consideration, allows a signal sent by the base station to the user to experience the best group of characteristic sub-channels, enhances intensity of the signal received by the user end and improves the system throughput.

Description

Technical field [0001] The invention belongs to the technical field of multiple antennas in wireless communication, and particularly relates to a transmission method based on characteristic subchannel interference alignment precoding matrix optimization in a multi-cell multi-antenna interference channel. Background technique [0002] Proposed by "Interference Alignment and Spatial Degrees of Freedom for the K User Interference Channel", IEEE Transactionon Information Theory, Vol.54, issue 8, August 2008, p.3425-3441) In a multi-cell multi-antenna system, through the design of the base station precoding matrix, the interference signals from other cells to this cell can be aligned to a specific subspace, so that users can use simple zero-forcing processing to align the interference signals of other cells. Interference is completely eliminated, this method is called interference alignment. The advantage of this method is that it can align the interference of other cells with only h...

Claims

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Application Information

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IPC IPC(8): H04L1/06
Inventor 王存祥邱玲
Owner UNIV OF SCI & TECH OF CHINA
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