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Large-scale fading based pilot frequency distribution method in large-scale MIMO (multiple input multiple output) system

A large-scale fading and pilot allocation technology, applied in the field of communication systems, can solve problems such as complexity and pilot pollution effects, which are difficult to implement algorithms

Inactive Publication Date: 2015-03-11
SHANDONG UNIV
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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a pilot allocation method based on large-scale fading in a massive MIMO system, which effectively reduces the influence of pilot pollution effects, improves system fairness, and makes all expectations The minimum SINR among users is maximized, and at the same time, for a given SINR target, the proportion of users who can achieve this target can be maximized; and the existing methods for mitigating the effect of pilot pollution are difficult to implement and the algorithm is complex.

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  • Large-scale fading based pilot frequency distribution method in large-scale MIMO (multiple input multiple output) system

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Embodiment Construction

[0007] A pilot allocation method based on large-scale fading in a massive MIMO system, comprising the following steps:

[0008] Step 1. Obtain the large-scale fading coefficient β from user k in cell j to the base station in the central cell jk , j∈{1,…,L},k∈{1,…,K}, where L is the number of cells, K is the number of users in each cell, and the value range of L and K is greater than an integer of 1;

[0009] Step 2. According to the large-scale fading coefficients obtained in step 1, number the desired users according to the large-scale fading coefficients from small to large, so as to determine the degree of interference of the desired users;

[0010] Step 3. According to the large-scale fading coefficient obtained in step 1 and the sort number of the degree of interference to the expected user obtained in step 2, the SINR maximization is used as the criterion, and the greedy user scheduling algorithm is adopted, and the interference degree is ranked from strong to weak Per...

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Abstract

The invention relates to a large-scale fading based pilot frequency distribution method in a large-scale MIMO (multiple input multiple output) system, wherein a large-scale fading coefficient of a user is utilized to determine the strength of interference on the expected user, SINR maximization is taken as a target, the greedy-strategy-based user scheduling algorithm is adopted to determine user grouping according to the order from high degree of interference to low degree of interference on the expected user, so as to distribute the pilot frequency. With adoption of the method, the large-scale fading slowly changing with time is utilized to distribute the pilot frequency and certain practicality is realized, the influences of the pilot pollution effect are reduced, and the fairness of the system is improved.

Description

technical field [0001] The invention relates to a pilot allocation method based on large-scale fading in a massive MIMO system, belonging to the field of communication systems. Background technique [0002] With the increasing demand of users for high-speed data services and the increasing number of cell users, the demand for spectrum resources in mobile communication networks is also increasing. Massive MIMO systems have greatly improved channel capacity and spectrum efficiency by deploying a large number of antennas on the base station and adopting time division duplex (TDD) operation during transmission, which has attracted widespread attention in the field of wireless communication. In the TDD communication mechanism, both uplink training and data transmission are completed within the same coherent time. Therefore, using channel reciprocity, channel state information (CSI) can be obtained through uplink training. [0003] Since the number of orthogonal pilot sequences ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04B7/04
CPCH04L5/0048H04B7/0413
Inventor 张海霞韩希婷周晓天郭帅帅董冠男
Owner SHANDONG UNIV
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