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Pilot allocation method based on user clustering

A technology of pilot allocation and user clustering, which is applied in the field of communication systems to improve performance and reduce the impact of pilot pollution

Active Publication Date: 2016-12-14
SHANDONG UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, in practical applications, the location of users in the cell is random and mobile. This method of assuming symmetrical distribution of users and fixedly assigning pilots according to geographical locations has certain limitations in practical applications.

Method used

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  • Pilot allocation method based on user clustering
  • Pilot allocation method based on user clustering
  • Pilot allocation method based on user clustering

Examples

Experimental program
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Embodiment

[0052] figure 2 What is shown is a schematic diagram of a pilot cluster when users are symmetrically distributed in each cell in a 7-cell system. Due to the geographical symmetry, it can be based on figure 1 Region division method shown, by region A 0 、A 1 、A 2 Assign pilot clusters. As long as the area where the user is located is determined, the pilot cluster used by the user can be determined. However, in actual communication, the position of the user in the cell is random, figure 2 This method of allocating pilot clusters according to regions has certain limitations,

[0053] A user clustering-based pilot allocation method for pilot pollution precoding in large-scale antenna systems, such as Figure 4 As shown, the massive antenna system includes 7 equivalent hexagonal cells, such as image 3 As shown, each cell is equipped with a base station and serves 3K users at the same time. The large-scale antenna system also includes 3K mutually orthogonal pilots. The spe...

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Abstract

The invention relates to a pilot allocation method based on user clustering. In view of random distribution of users in a system cell, the users are divided into user clusters based on large-scale decline information of the users. Then, a same pilot cluster is allocated to the user clusters choosing the same cooperation base station, and the principle on which the user clusters in the same cell allocate orthogonal pilots is that users allocate pilots and then interference brought about by pilot contamination is weakened by use of a pilot contamination pre-coding technology. Therefore, the signal-to-interference ratio of users' reception is improved, and the purpose of system performance improving is achieved.

Description

technical field [0001] The invention relates to a pilot allocation method based on user clustering, in particular to a pilot allocation method based on user clustering used for pilot pollution precoding in a large-scale antenna system, and belongs to the technical field of communication systems. Background technique [0002] Massive MIMO technology has become one of the key technologies of the fifth generation mobile communication (5G) due to its many excellent performances. Existing studies have shown (see literature [1] for details, literature [1]: L.Lu, G.Li, A.Lee; A.Ashikhmin, R.Zhang, "An Overview of Massive MIMO: Benefits and Challenges," IEEE Journal of Selected Topics in Signal Processing, vol.8, no.5, pp.742-758, 2014.), as the number of antennas at the base station increases, the impact of uncorrelated noise on the communication system decreases; the channel between different users Tends to be orthogonal; simple linear precoding can achieve optimal results. Howe...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04B7/04
CPCH04B7/0413H04L5/0048
Inventor 张海霞刘见花郭帅帅袁东风周晓天
Owner SHANDONG UNIV
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