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Alignment method based on combined interference in mimo system under non-ideal channel state

A channel state and combined interference technology, applied in the field of interference management, can solve problems such as high complexity, high performance, and low complexity, and achieve the effect of reducing complexity

Active Publication Date: 2020-11-24
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] Existing interference alignment techniques have their own characteristics, such as the minimum interference leakage (Min-Leakage) algorithm, low complexity but low performance; the maximum signal-to-interference-noise ratio (Max-SINR) algorithm, high performance but complex also high

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Embodiment Construction

[0051] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0052] Such as figure 1 As shown, the system model of the present invention is a MIMO interference network of K users, where sending user k installs M k Antennas, receiving user k installed N k root antenna. The receiving user k only has a data connection with the sending user k, and the signal from the sending user l (l≠k) is regarded as interference by the receiving user.

[0053] refer to Figure 4 , the invention is figure 1 The steps for interference alignment in the system model shown are as follows:

[0054] 1. Initialize the parameters and obtain the non-ideal channel model

[0055] The channel model under non-ideal channel state can be expressed as:

[0056]

[0057] Among them, H k,j is the actual channel state matrix between the transmitter of user j and the receiver of user k, for H k,j The estimated value of is the chan...

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Abstract

The invention discloses a combination-based interference alignment method in an MIMO system under nonideal channel condition. According to features of two algorithms: a Max-SINR algorithm and a Min-WLI algorithm, compromise between two aspects: complexity and performance is carried out; the iteration processes of the Max-SINR algorithm and the Min-WLI algorithm comprise processing a precoding matrix and an interference inhibition matrix and the iteration processes are mutually independent, so Min-Leakage algorithm iteration can be carried out on the system firstly, after the iteration is finished, the Max-SINR algorithm iteration is carried out, and the complexity of the algorithms can be effectively reduced.

Description

technical field [0001] The invention relates to an alignment method based on combined interference in a MIMO system under a non-ideal channel state, and belongs to the technical field of interference management. Background technique [0002] Interference alignment (IA) technology is one of the current research hotspots in the field of wireless communication. It is an efficient interference management mechanism. By precoding the transmitted signal at the transmitting end, the interference signals from multiple other transmitting users Overlapping at the receiving end solves the interference problem and greatly improves the system capacity. [0003] The research on interference alignment technology is still in its infancy, and there are still many problems to be solved. For example, most of the current research on interference alignment technology is carried out on the premise of having ideal channel state information. There will be errors in the information, and if you want...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B7/0452
CPCH04B7/0452H04B7/0456
Inventor 傅友华刘维王海荣
Owner NANJING UNIV OF POSTS & TELECOMM
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