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Iterative interference alignment method based on double-layer precoding in multi-user MIMO interference system

An interference system and interference alignment technology, applied in transmission systems, radio transmission systems, electrical components, etc., can solve the problems of channel reciprocity dependence, slow convergence speed, and inability to take into account expected signal loss, etc.

Active Publication Date: 2017-04-26
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] Aiming at the ubiquitous problems of iterative interference alignment technology's dependence on channel reciprocity, slow convergence speed and inability to take into account the expected signal loss while suppressing interference, the present invention provides an iterative interference alignment method based on double-layer precoding

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  • Iterative interference alignment method based on double-layer precoding in multi-user MIMO interference system
  • Iterative interference alignment method based on double-layer precoding in multi-user MIMO interference system
  • Iterative interference alignment method based on double-layer precoding in multi-user MIMO interference system

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Embodiment Construction

[0044] The specific implementation process of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] The system environment multi-user MIMO (Multiple Input Multiple Output, MIMO) interference system model of the present invention is as follows figure 1 As shown, it is assumed that there are K transceiver pairs, that is, there are K users and K transmitters in total, and the users and base stations are respectively configured with N r and N t antennas, the number of user expected signal data streams is d, d≤min(N r ,N t ). User k and transmitter k are the desired transmitter and desired user, k∈{1,2,...,K}. Due to the broadcasting and superposition nature of the wireless communication system, when user k communicates with the transmitter k, he will receive the desired signal and the undesired signal at the same time. The received signal of j can be expressed as:

[0046]

[0047] in is the flat fading channel m...

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Abstract

The invention relates to an iterative interference alignment method based on double-layer precoding in a multi-user MIMO interference system. The method comprises the following steps of firstly, according to a special form of an external layer precoding matrix, segmenting internal layer precoding into two submatrixes and solving; then taking a condition of minimizing a total interference leaked by a transmitting terminal to a non-target user as a purpose, converting a design of the external layer precoding matrix into a constraint optimization problem, and using a steepest gradient descent method to acquire an optimal solution of the external layer precoding matrix; and finally, designing and receiving the matrix by a receiving terminal and further carrying out interference suppression. Through repeating the above steps, a purpose of interference elimination can be reached. In the invention, dependence on channel reciprocity in an iteration IA method is broken through; the external layer precoding matrix is designed into the special form so that rapid convergence during an iteration interference elimination process can be realized and losses of an expected signal are converted into a predictable problem and can be avoided through using pertinency of an internal layer precoding matrix; and a realization process is simple and an application range is wide.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an iterative interference alignment method based on double-layer precoding in a multi-user MIMO interference system. Background technique [0002] Due to the broadcasting and superposition properties of wireless communication systems, interference becomes the key to restricting the improvement of system performance. Facing the contradiction between the continuous improvement of users' requirements for communication quality and speed and the sharp increase in the number of users in wireless communication systems, the sources of interference are also increasing. How to effectively eliminate interference has become an urgent problem in the field of wireless communication. In the long-term research, a variety of interference cancellation technologies have been proposed one after another. The traditional interference countermeasures include orthogonalizing shared time-f...

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Application Information

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IPC IPC(8): H04B7/0456H04B7/0452
CPCH04B7/0452H04B7/0456
Inventor 景小荣莫林琳
Owner CHONGQING UNIV OF POSTS & TELECOMM
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