Interference aligning method based on combined power distribution in LTE

A technology of joint power allocation and interference alignment, which is applied in the field of interference alignment power allocation in LTE, can solve the problems of underutilization of the total system power and system performance degradation, etc.

Active Publication Date: 2013-06-19
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In this way, the total power of the system is not fully utilized, which degrades the system performance

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  • Interference aligning method based on combined power distribution in LTE
  • Interference aligning method based on combined power distribution in LTE
  • Interference aligning method based on combined power distribution in LTE

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Embodiment Construction

[0025] The implementation of the present invention will be further described in detail below with reference to the drawings and specific examples.

[0026] The system model adopted in the present invention is the K-user MIMO interference channel model (K≥2), as shown in the attached figure 1 shown. attached figure 1 Shown is the K-user MIMO interference channel model (K≥2), all transmitters are equipped with M antennas (M≥2), all receivers are equipped with N antennas (N≥2), H ij is the MIMO channel matrix between transmitter j (j=1,2,…,K) and receiver i (i=1,2,…,K). Considering that the number of users is 3 (ie K=3), the degree of freedom of the MIMO interference channel is

[0027] First, choose according to the maximum chord distance criterion The eigenvectors corresponding to the largest eigenvalues ​​obtain the precoding matrix, so that the distance between the interference subspace and the desired signal subspace is maximized; secondly, the power allocation matrix...

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Abstract

The invention provides an interference aligning method based on combined power distribution in LTE and relates to the field of wireless communication. According to the method, interference alignment and power distribution are combined. The power distribution is conducted among each data flow. A power distribution matrix is determined by characteristic values corresponding to data flow vectors so that interference is further reduced. The interference aligning method is particularly suitable for eliminating the interference among LET network zones. System capacity and energy capacity are obtained. The interference aligning method is low in calculation complexity and easy to realize.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to the power allocation problem of interference alignment in LTE. Background technique [0002] LTE is a 3G evolution broadband mobile communication technology proposed by 3GPP. It has high data rate, reduced delay, packet transmission, wide area coverage and backward compatibility. LTE adopts the OFDM access method, and the information of different users is carried on different subcarriers. Therefore, the interference in the cell is basically eliminated, but the interference between LTE cells still exists, especially the performance degradation of the cell edge users is very obvious. [0003] Interference alignment (Interference alignment, S.Jafar, M.Fakhereddin. Degrees of freedom for the MIMO interference channel, IEEE International Symposium on Information Theory, 2006, pp.1452–1456) has become an important issue in recent years due to its advantages in system capacity Its...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/06H04B7/08H04W52/42
Inventor 谢显中周志栋雷维嘉
Owner CHONGQING UNIV OF POSTS & TELECOMM
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