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A Dynamic Pilot Allocation Method in Massive MIMO System

A pilot frequency allocation, large-scale technology, applied in transmission systems, digital transmission systems, radio transmission systems, etc., can solve the problem of insufficient pilot frequency, and achieve the effect of reducing pilot frequency pollution

Active Publication Date: 2020-05-12
CHONGQING UNIV OF POSTS & TELECOMM
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the model here is just a group of pilots reused by several adjacent cells, and when the number of cells gradually increases, obviously due to the limitation of coherence time, the number of pilots at this time is not enough

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  • A Dynamic Pilot Allocation Method in Massive MIMO System
  • A Dynamic Pilot Allocation Method in Massive MIMO System
  • A Dynamic Pilot Allocation Method in Massive MIMO System

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Embodiment Construction

[0027] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0028] The technical scheme that the present invention solves the problems of the technologies described above is:

[0029] The invention proposes a dynamic pilot allocation method in a massive MIMO system. Use the difference of the large-scale fading coefficient between the user in the cell and the base station to group the users in the cell; for the situation where the number of pilots is not enough in multiple cells, introduce the concept of block group, divide the pilot into each block group, and use the block group as the basis The basic unit is to multiplex the pilot frequency.

[0030] figure 1 It is the basic model of multi-cell massive MIMO system. Consider a multi-user massive MIMO system con...

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Abstract

The invention discloses a dynamic pilot distribution method in a large-scale MIMO system. The number of center users and the number of edge users in cells are calculated according to the number of cells in cell groups, the number of the users in the cells and pilot sequence lengths; and pilots are randomly selected and are divided into the corresponding number of pilot sequence subsets. The usersin the cells are sorted in a descending order according to large-scale fading coefficients between different users and a base station. The users in the cells are divided into cell center user groups and cell edge user groups through combination of the previously calculated number of center users and number of edge users. For the cell edge user groups, mutually orthogonal pilot sequences are allocated to adjacent cell edge users in the cell groups. Inter-cell group pilot multiplexing is realized by the adjacent cell edge users out of the cell groups. For the cell center users, the same pilots are allocated to all center users. The system pilot allocation flexibility is improved, a system utilization rate is improved, and the purpose of reducing pilot pollution is achieved.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and relates to a dynamic pilot allocation method in a massive MIMO system. Background technique [0002] In the TDD multi-cell environment based on the massive MIMO system, since the base station is equipped with a large number of antennas, it has an ultra-high information transmission rate and intra-cell interference far beyond the traditional technology. However, due to the limitation of coherence time, all cells There must be pilot multiplexing among users, and pilot pollution has become a bottleneck restricting the further development of massive MIMO technology. How to suppress pilot pollution in massive MIMO is one of the focuses in the communication field. [0003] In the TDD multi-cell massive MIMO system, the existing pilot allocation method is that the base station adaptively divides the pilot into m+1 subsets according to the number m of adjacent cells, assuming that the u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04B7/0413
Inventor 李小文周佳叶颂基余永坤王丹陈发堂王华华刘宇
Owner CHONGQING UNIV OF POSTS & TELECOMM