Interference alignment method based on water injection power distribution

A technology of water injection power distribution and interference alignment, applied in radio transmission systems, electrical components, transmission systems, etc., can solve the problems of difficult application engineering and high algorithm complexity, and achieve improved performance, simplified derivation operations, and improved transmission rate performance. Effect

Inactive Publication Date: 2017-07-18
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, these algorithms allocate power equally to each data stream. In order to make full use of the power of the system, some scholars have proposed a joint design of interference alignment and power allocation algorithms in recent years. Although some can reduce the bit error rate of the system, but At the cost of sacrificing a part of the transmission rate, some can only be applied to some application scenarios, which have certain limitations, and some algorithms have high complexity and are difficult to apply to actual projects

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  • Interference alignment method based on water injection power distribution
  • Interference alignment method based on water injection power distribution
  • Interference alignment method based on water injection power distribution

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0036] figure 1 is the equivalent interference channel diagram of the K-cell K-user system applicable to the present invention. In this case, 3 cells are used, each cell serves a user, and the base station and the user are equipped with a downlink scenario of 5 antennas. Each base station sends to User 2 data streams. The system works in downlink. Each base station will cause interference to users outside the cell, especially the edge users between cells will be greatly interfered, the system model is as follows figure 2 As shown, the process is as follows image 3 As shown, the specific implementation steps are:

[0037] (1), the number of initialization iterations q=1, the initialization step size t, and the kth base station initializes a 5×2-dimensional precoding matrix V k,0 , k=1, 2, 3, the base station distributes the maximum available ...

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Abstract

The invention discloses an interference alignment method based on water injection power distribution, and the method comprises the steps that a base station randomly broadcasts a pre-coding matrix; a user takes the minimization of the total interference leaked power as the target; a decoding matrix is designed along an increase direction of transmission rate based on a gradient decrease algorithm of Grassmann manifold, and then the communication direction is inverted; the user enables the updated decoding matrix to be transmitted to the base station; the base station updates the pre-coding matrix, and the matrix reaches convergence after iteration, thereby finally obtaining an interference alignment effect; the base station is responsible for the power distribution, equally distributes power to each data flow according to the maximum usable power preset by the base station, and carries out the iterative power distribution of different data flows transmitted to the users in a mode of water injection power distribution according to the channel gains of different data flows. The method achieves the obtaining of a higher transmission rate under the condition that the complexity is not increased remarkably while achieving the interference alignment.

Description

technical field [0001] The invention relates to the technical field of mobile wireless communication, in particular to an interference alignment method based on water injection power allocation. Background technique [0002] With the wide application of multi-antenna technology, interference has become the main factor limiting the improvement of wireless network performance. Traditional interference suppression methods treat interference as noise or orthogonalize it. However, these methods have their own shortcomings. For example, although the method of treating interference as noise is simple and easy to implement, it cannot deal with large signal strength. interference. [0003] Interference alignment technology is one of the latest interference suppression technologies. Its basic idea is to compress the space dimension occupied by the interference signal at the receiving end, and try to ensure that the subspace dimension of the desired signal is large enough. The emerge...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04B7/0413H04B7/0426H04B7/0456
CPCH04B7/0413H04B7/0443H04B7/046
Inventor董恒李晨曦刘思琴
OwnerNANJING UNIV OF POSTS & TELECOMM