Pilot frequency distribution method

A pilot frequency allocation and unallocated technology is applied in the application field of communication technology, which can solve problems such as pilot frequency pollution, and achieve the effects of reducing pilot frequency pollution, low computational complexity, and easy implementation.

Inactive Publication Date: 2016-06-01
BEIJING UNION UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0010] It can effectively solve the serious pilot pollution problem between adjacent cell users in the massive MIMO system under the actual network architecture and propagation environment

Method used

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Embodiment Construction

[0056] Such as figure 1 Shown is the implementation method flow process of the present invention, and this method comprises the following steps,

[0057] Step 1: Generate network-level base sequences

[0058] According to the generation method of Chu sequence, generate network-level pilot base sequence a=[a 0 , a 1 ,...,a τ-1 ], τ is the sequence length. where a n resulting from the following formula:

[0059] a n = exp i N π τ N ( n + ( τ mod 2 ) )

[0060] n=0,1,...,τ-1(1)

[0061] Where i is the imaginary unit, N is the control parameter, which should be an integer that is relatively prime to τ; a 0 , a 1 ,...,a τ-1 is the elements of the sequence a, and the whole sequence is...

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Abstract

The invention provides a pilot frequency distribution method. The method can be used for effectively solving the problem of serious pilot frequency pollution between adjacent cell users in a large-scale MIMO system in actual network architecture and a transmission environment. The method comprises the following steps: a step 1, generating a network level base sequence; a step 2, generating a cell level base sequence; a step 3, generating a user level base sequence; a step 4, calculating statistical mutual correlation values between user pilot frequency sequences and the pilot frequency sequences of the adjacent cell; a step 5, sequencing and grouping the user pilot frequency sequences in each cell according to the statistical mutual correlation values; a step 6, determining a pilot frequency group to which a user belongs; a step 7, allocating the user pilot frequency; a step 8, updating channel estimation; and a step 9, updating the user pilot frequency. The method can be used for effectively reducing the serious pilot frequency pollution between adjacent cell users resulting from a limited number of orthogonal pilot sequences in the MIMO system, and improving the actual performance of the MIMO technology; and the method is simple to implement, relatively low in computational complexity and is relatively good in realizability.

Description

technical field [0001] The invention relates to a pilot allocation method, which belongs to the application field of communication technology. Background technique [0002] The MIMO technology that has been practically applied at present is generally based on a small number of antenna arrays (usually less than 10 array elements). In recent years, a new massive array MIMO (Massive MIMO) technology has received extensive attention. Its most important feature is that the number of array elements of the antenna array has been significantly increased, generally reaching dozens or even hundreds of array elements. The communication system based on this antenna can significantly improve the system transmission reliability and information transmission rate through simple signal processing. That is, assuming that the base station has ideal channel state information (at this time, the channels from each user to the base station are orthogonal), through simple linear processing (for e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04B7/04
CPCH04B7/0413H04L5/0048
Inventor 李克李文法
Owner BEIJING UNION UNIVERSITY
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