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User location information based large-scale MIMO system pilot frequency distribution method

A technology of system pilot frequency and location information, applied in the field of communication systems, can solve problems such as difficult to implement algorithms, complex problems, etc.

Active Publication Date: 2015-03-04
SHANDONG UNIV
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Problems solved by technology

This method can effectively reduce the influence of pilot pollution effects, improve system fairness, maximize the minimum SINR among all expected users, and at the same time, for a given SINR target, maximize the proportion of users who achieve this target; There are problems such as the difficulty in realizing the method to solve the pilot pollution effect and the complexity of the algorithm

Method used

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  • User location information based large-scale MIMO system pilot frequency distribution method
  • User location information based large-scale MIMO system pilot frequency distribution method
  • User location information based large-scale MIMO system pilot frequency distribution method

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Embodiment Construction

[0008] A method for allocating pilots in a massive MIMO system based on user location information, comprising the following steps:

[0009] Step 1. Initialize the user number as a natural number, where the natural number refers to the sequential numbering in integer order;

[0010] Step 2, obtain the distance from the user in each cell to the base station in the center cell, set the position coordinates of the base station in the center cell as (x 0 ,y 0 ), the location coordinates of the kth user in the lth cell are (x lk ,y lk ), then the distance from the kth user in the lth cell to the base station in the central cell is expressed as d lk = ( x lk - x 0 ) 2 + ( ...

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Abstract

A user location information based large-scale MIMO system pilot frequency distribution method comprises initializing user numbers to be natural numbers; obtaining information of distances from users in all communities to a base station in a central community; dividing distance sections through Monte-Carlo simulation; determining section numbers of the distances of all users, and determining the interfered degree of expectation users and the interfering degree of interfering users; performing user scheduling and obtaining user groups with SINR maximization as the criterion and using a greedy user scheduling algorithm; the base station performs pilot frequency distribution on all the groups. By the aid of the method, pilot frequency distribution is performed on user location information changing slowly along with time, and accordingly, the influence of pilot frequency pollution effect is reduced; by the method of user equivalence class division through the distance, the influence of shadow effect uncertainty on the interference degree is reduced effectively, and the pilot frequency distribution result robustness is improved.

Description

technical field [0001] The invention relates to a large-scale MIMO system pilot allocation method based on user location information, 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 spectral efficiency by deploying a large number of antennas on the base station and using time division duplex (TDD) operation in the transmission process, 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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00
CPCH04L5/0048H04L5/0069H04L5/0073
Inventor 张海霞韩希婷周晓天郭帅帅董冠男
Owner SHANDONG UNIV
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