Precoding method based on interference alignment

An interference alignment and precoding technology, which is applied in the field of interference alignment-based precoding, can solve problems such as too many antenna data

Active Publication Date: 2014-04-02
BEIJING UNIV OF POSTS & TELECOMM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem solved by the present invention is: how ...

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  • Precoding method based on interference alignment

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Embodiment 1

[0048] In order to solve the problem of many user terminal antenna data items in the prior art, an embodiment of the present invention provides a precoding method based on interference alignment. The flow chart of the method is as follows: figure 1 As shown, the method includes:

[0049] Step 101: Use the channel state information between the receiver and the base station to calculate the multi-cell decoding matrix;

[0050] Step 102: Obtain and calculate the precoding matrix of the transmitter according to the uplink channel state information of the cell where the receiver is located and the decoding matrix of the cell where the receiver is located;

[0051] Step 103: Precoding the downlink data according to the precoding matrix of the transmitter.

[0052] The embodiment of the present invention provides a precoding method based on interference alignment, obtains a multi-cell decoding matrix by calculation, and calculates a transmitter's precoding matrix according to the multi-cell ...

Embodiment 2

[0057] According to the above-mentioned embodiments and the technical problems to be solved, the embodiments of the present invention also provide a precoding method based on interference alignment. The method includes:

[0058] Step 201: Calculate the decoding matrix of the multi-cell;

[0059] Calculate the multi-cell decoding matrix by the following two methods;

[0060] 1) Using the grouping method, all users [1,i],......,[K,i] in the same cell i are grouped into one group, taking 3 cells as an example, only considering the base station i to For the interference of users in all i+1 cells, when i=3, another i+1=1.

[0061] Then the decoding matrix is ​​obtained by formula (1):

[0062] [ H i [ 1 , i + 1 ] H H i [ 2 , i + 1 ] H · · · H i [ K , i + 1 ] H ] U [ 1 , i + 1 ] U [ 2 , i + 1 ] . . . U [ K . i + 1 ] ...

Embodiment 3

[0083] The embodiment of the present invention provides a precoding method based on interference alignment for the situation of four users in each cell, such as figure 2 As shown in the figure (M,N,K,L,d)=(10,6,4,3,1), M represents the number of antennas of the base station, N represents the number of antennas of the user, and K is the user of each cell Number, L is the number of cells, d is the number of received data streams, there are three cells, each cell has four users, the method includes:

[0084] Step 301: randomly discard one user among the four users in each cell, assuming that the fourth user in the three cells is discarded respectively;

[0085] Arbitrarily select the decoding matrix of the remaining three users.

[0086] E.g: with ,among them The m×n-dimensional decoding matrix representing the user [j,i]. The remaining three users do not participate in the interference alignment process, so it can be said that the remaining three users are discarded before the in...

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Abstract

The invention provides a precoding method based on interference alignment, which comprises the steps of calculating decoding matrixes of a plurality of cells by using channel state information between a receiver and a base station, acquiring and calculating a precoding matrix of a transmitter according to up channel state information of the cell where the receiver is located, and a decoding matrix of the cell where the receiver is located, and precoding down data according to the precoding matrix of the transmitter. The method obtains the decoding matrixes of the cells, calculates the precoding matrix of the transmitter according to the decoding matrixes of the cells and precodes the down data according to the precoding matrix, so that the interactive quantity of channel information and the antenna quantity of a client are effectively reduced, and the system complexity is reduced.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a precoding method based on interference alignment. Background technique [0002] With the continuous development of communication technology, interference alignment technology has been extensively studied in broadcast channels. [0003] At present, the existing method is to extend the grouping method to multi-cell and multi-user scenarios, and to provide the use of the smallest number of transmitting and receiving antennas in the extended grouping interference alignment method, while using multiple access and broadcast channels. The hybrid interference alignment of the duality principle. Therefore, the inter-user interference and inter-cell interference that interfere with the broadcast channel can be eliminated at the same time. [0004] However, in the prior art, the hybrid interference alignment is implemented, and the number of antennas of the user terminal is large,...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 李立华靳进王昕赵晶晶梁毅
Owner BEIJING UNIV OF POSTS & TELECOMM
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