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A pilot allocation method that takes into account the overall performance of massive MIMO systems and the fairness among users

A pilot allocation and user-to-user technology, applied in the field of communication systems, can solve problems such as pilot pollution, achieve low complexity, maximize overall performance, and facilitate implementation

Active Publication Date: 2019-11-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the pilot pollution problem in the Massive MIMO system, the present invention proposes a pilot allocation method that takes into account the overall performance of the Massive MIMO system and the fairness among users

Method used

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  • A pilot allocation method that takes into account the overall performance of massive MIMO systems and the fairness among users
  • A pilot allocation method that takes into account the overall performance of massive MIMO systems and the fairness among users
  • A pilot allocation method that takes into account the overall performance of massive MIMO systems and the fairness among users

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Embodiment

[0040] A pilot allocation method that takes into account the overall performance of the Massive MIMO system and the fairness among users, such as figure 2 As shown, the Massive MIMO system is as figure 1 As shown, it includes 3 equivalent hexagonal cells, each cell includes 1 central base station and 5 users, 1 central base station serves 5 users at the same time, the system model diagram simply describes the cell users and the central The configuration of the base station. It can be seen from the model diagram that due to the sharing of the same pilot, the base station will receive mutually interfering pilot information at the same time during uplink pilot estimation, and this mutual interference will cause pilot pollution. The specific steps include:

[0041] (1) According to the distance from the user to the central base station, obtain the large-scale fading information from each user in each cell in the Massive MIMO system to each central base station refers to the la...

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Abstract

The invention relates to a pilot frequency distributing method with Massive MIMO system overall performance and inter-user fairness. The maximization system speed product is used as an optimal object. While the optimal problem in the method is solved, the pilot frequency distributing method based on the greedy strategy is used. The greedy pilot frequency distributing method has the lower complexity, and can be realized easily. So the provided pilot frequency distributing method has the inter-user fairness under the situation of the maximization system overall sum speed, and the effective compromise between the system overall performance and the inter-user fairness can be realized.

Description

technical field [0001] The invention relates to a pilot allocation method that takes into account both the overall performance of a Massive MIMO system and the fairness among users, and belongs to the technical field of communication systems. Background technique [0002] As one of the key technologies of 5G wireless communication system, massive antenna technology (Massive MIMO technology) has attracted more and more researchers' attention in recent years because of its ability to provide faster, stronger and better services. The performance of the Massive MIMO system will increase with the increase of the number of base station antennas, but this performance improvement is not unlimited. In TDD mode, when the number of antennas at the base station reaches a certain number, the system performance tends to be saturated. At this time, pilot pollution becomes the main problem that limits system performance. The problem of pilot pollution occurs because there is interference b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00
CPCH04L5/0048H04L5/0058H04L5/0071H04L5/0076
Inventor 张海霞刘见花袁东风周晓天郭帅帅
Owner SHANDONG UNIV