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Beamforming Method for Pilot Contamination Suppression in Massive MIMO Systems

A beamforming method and pilot pollution technology, applied in transmission systems, radio transmission systems, baseband system components, etc., can solve problems such as pilot pollution, high system overhead, and implementation difficulties, to reduce interference and improve performance , the effect of small system overhead

Inactive Publication Date: 2017-06-06
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] Existing literatures address the problem of pilot pollution, or discuss the ideal scenario where the number of base station antennas tends to be infinite, or have high system overhead, which is difficult to implement

Method used

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  • Beamforming Method for Pilot Contamination Suppression in Massive MIMO Systems
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  • Beamforming Method for Pilot Contamination Suppression in Massive MIMO Systems

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Embodiment Construction

[0020] The present invention is described in further detail below in conjunction with accompanying drawing:

[0021] refer to figure 1 , the pilot pollution suppression beamforming method in the massive MIMO system of the present invention comprises the following steps:

[0022] 1) Suppose the MIMO system contains L cells, each cell is equipped with a base station with M antennas, and all base stations in the MIMO system are divided into N groups, then the optimal beam sent by the kth user in the i-th cell The shape vector is:

[0023]

[0024] in, is the useful signal power of the kth user in the i-th cell, is the interference of the downlink data of the k-th user in the i-th cell to the channel estimation of each cell in all groups, is the interference of the downlink data of the kth user in the i-th cell to other users in the cell, α is the weight factor, is the channel estimation of the kth user in the i-th cell, is the optimal beamforming vector of the kth u...

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Abstract

The invention discloses a pilot pollution abatement beam forming method for a large-scale MIMO system. The pilot pollution abatement beam forming method for the large-scale MIMO system comprises the following steps that (1) it is supposed that the MIMO system comprises L cells, each cell is provided with one base station with M antennas, and all the base stations of the MIMO system are divided into N groups; (2) the optimal beam forming vector of the kth user in the ith cell is obtained according to generalized Rayleigh entropy, the optimal beam forming vector of each user in each group is obtained, and then data transmission is carried out in the MIMO system according to the optimal beam forming vector of each user in each group. According to the pilot pollution abatement beam forming method for the large-scale MIMO system, the channel estimation precision and the spectrum efficiency performance of a multi-cell large-scale MIMO system can be improved, and the expense of the system is low.

Description

technical field [0001] The invention belongs to the technical field of cooperative multipoint transmission in a wireless communication system, and relates to a pilot pollution suppression beamforming method in a massive MIMO system. Background technique [0002] Theoretical studies based on massive MIMO systems show that when the number of base station antennas tends to infinity, the channel vectors between the base station and different users present approximately orthogonal characteristics, so the influence of interference and noise in the cell will disappear, limiting the performance of the system. The only remaining decisive factor is pilot pollution. At this point, the system performance can be significantly improved by only simple linear processing. In such a system, effectively suppressing pilot pollution to reduce the performance loss caused by pilot pollution and further improving the performance of massive MIMO systems has become a research focus. [0003] The ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0413H04B7/06
CPCH04B7/0617H04L25/0202
Inventor 吕刚明张国梅田华李国兵黄莹
Owner XI AN JIAOTONG UNIV
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