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Interference alignment precoding method in MIMO (Multiple Input Multiple Output) interference channel based on self-adaptive composite cost function

A technology of cost function and interference channel, applied in the direction of space transmit diversity, radio transmission system, electrical components, etc., can solve unreasonable problems

Active Publication Date: 2016-05-11
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The second design idea simply believes that the optimization of the interference suppression matrix can only be completed by the receiving end, so it is extremely unwise to directly avoid the calculation of the interference suppression matrix to simplify the implementation mechanism of the IA algorithm.

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  • Interference alignment precoding method in MIMO (Multiple Input Multiple Output) interference channel based on self-adaptive composite cost function
  • Interference alignment precoding method in MIMO (Multiple Input Multiple Output) interference channel based on self-adaptive composite cost function
  • Interference alignment precoding method in MIMO (Multiple Input Multiple Output) interference channel based on self-adaptive composite cost function

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[0035] The implementation flow of the present invention will be further described in detail in conjunction with the accompanying drawings.

[0036] In the present invention, the multi-user MIMO (MultipleInputMultipleOutput, MIMO) interference system model is as figure 1 Shown: The number of users is K, that is, there are K senders and receivers in total, and the kth transceiver pair is configured with N k and M k root antenna, transmit d k data streams satisfying d k ≤min(M k ,N k ). While receiving the desired number of signals, each receiver will also receive interference signals from other K-1 undesired transmitters, therefore, the signal y received by the kth receiver k Can be expressed as:

[0037]

[0038] in is the flat fading channel matrix from transmitter j to receiver k, means N k × M j dimensional Euclidean space; Indicates the flat fading channel matrix corresponding to the kth transceiver pair; Indicates the transmitted signal vector, the prec...

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Abstract

The invention discloses an interference alignment precoding method in an MIMO interference channel based on a self-adaptive composite cost function belonging to the wireless communication technical field. The core concept is realizing the optimization design of a precoding matrix through the assistance of an intermediate variable. The method comprises following steps: firstly, defining the weighting difference of the residual interference and the desired signal power in a desired subspace as the cost function, obtaining the self-adaptive selection mode of a weight coefficient through a maximal-ratio combining concept; then constructing an assist function according to the decoding mode of a receiving end, converting an interference suppression matrix into the intermediate variable, thus compositing the cost function; finally, realizing optimized solution of the self-adaptive composite cost function through a gradient descent method on Glassman manifold, thus obtaining the optimum solution of the precoding matrix. According to the method of the invention, the double targets of suppressing interferences and reserving desired signals are finished through relatively little complexity cost; therefore, the system performance is improved; the realization mechanism is simple and has wide applicability.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an interference alignment precoding method based on an adaptive composite cost function in a multi-user multiple input multiple output (Multiple Input Multiple Output, MIMO) interference channel system. Background technique [0002] Co-channel interference (Co-Channel Interference, CCI) inevitably exists in a multi-user MIMO system, and the existence of CCI seriously restricts the capacity of the multi-user MIMO system. Interference Alignment (IA) has attracted much attention as the most potential interference management technology proposed in recent years. Its core idea is to compress the interference signal into a specific low-dimensional subspace through the precoding matrix to retain as large a The interference-free space is used for the transmission of the desired signal. [0003] According to the different design methods of IA algorithm precoding matrix, exi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04
CPCH04B7/0456
Inventor 景小荣凌荣桢张祖凡陈前斌
Owner CHONGQING UNIV OF POSTS & TELECOMM
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