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Interference alignment based signal processing method for MIMO (Multiple Input Multiple Output) system in nonideal channel state

A channel state and interference alignment technology, applied in the direction of preventing/detecting errors through diversity reception, which can solve problems such as quantization error, channel estimation error, channel state information error, etc., and achieve the effect of improving performance and system capacity.

Active Publication Date: 2013-08-14
HARBIN INST OF TECH
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Problems solved by technology

However, most studies on interference alignment assume that the ideal channel state information exists, which in the actual system will have errors due to channel estimation errors, quantization errors, feedback delays, etc.

Method used

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  • Interference alignment based signal processing method for MIMO (Multiple Input Multiple Output) system in nonideal channel state
  • Interference alignment based signal processing method for MIMO (Multiple Input Multiple Output) system in nonideal channel state
  • Interference alignment based signal processing method for MIMO (Multiple Input Multiple Output) system in nonideal channel state

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specific Embodiment approach 1

[0073] Specific implementation mode 1. Combination figure 1 and figure 2 Describe this specific implementation mode, the signal processing method based on interference alignment in the MIMO system under the non-ideal channel state of MMSE,

[0074] Concrete steps of the present invention are as follows:

[0075]Step 1: Model the non-ideal channel to get the non-ideal channel model H kl ;

[0076] Step 2: Use the mean square error (MSE) as the criterion for the linear receiver of the system, and give the total MSE value ε of the interference network of K users;

[0077] Step 3: Calculate the mean value of ε to obtain the mean value of the total MSE in the presence of Gaussian channel error ;

[0078] Step 4: Under the power limit of each user, seek the linear codec design scheme that minimizes the total average MSE of users under the error of channel state information, that is, the optimization process

[0079] min imise ϵ ...

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Abstract

The invention discloses an interference alignment based signal processing method for an MIMO (Multiple Input Multiple Output) system in a nonideal channel state, relates to the field of wireless communication, and aims to increase the capacity of the MIMO system in the nonideal channel state. According to the signal processing method, after a central processing unit of a sending end well designs encoding matrixes and decoding matrixes, the encoding matrixes and the decoding matrixes are allocated to each base station, and the base stations transmit the corresponding decoding matrixes to corresponding receiving users. Namely, under the condition that the power of each user is limited and the channel state information has errors, linear encoding and decoding matrixes which enable the total average mean square error (MSE) of the users to be minimum are searched for optimization, firstly, precoding matrixes are initialized, and then the precoding matrixes and the decoding matrixes are updated in an iterating manner, so that the system throughput can be effectively increased.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a signal processing method in a MIMO system. Background technique [0002] Under the trend of "broadband mobile communication" and "mobile broadband access", the fourth-generation wireless communication technology represented by LTE and LTE-Advanced puts forward higher requirements for communication speed. The current mobile communication system is an interference-limited system, and the interference between users has become the biggest obstacle to the improvement of system capacity. However, there is no clear conclusion that is generally applicable to the problem of the capacity of the interference channel. Interference Alignment (IA, Interference Alignment), which has emerged in recent years, discusses the interference channel from the perspective of degrees of freedom, which can maximize the degree of freedom of the interference system. Interference alignment, as a bran...

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Application Information

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IPC IPC(8): H04L1/06
Inventor 贾敏李庆忠顾学迈刘鑫郭庆王振永石硕赵大伟李含青
Owner HARBIN INST OF TECH
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