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A Novel Pilot Allocation Method Applicable to Large-Scale Mimo Cellular Networks

A technology of pilot allocation and cellular network, which is applied in the directions of pilot signal allocation, transmission path sub-channel allocation, multiple use of transmission path, etc. It can solve the problem of information rate reduction and achieve high-efficiency pilot allocation, excellent performance, and elimination of Effects of severe pilot jamming phenomenon

Active Publication Date: 2020-11-03
CHINA INFOMRAITON CONSULTING & DESIGNING INST CO LTD
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AI Technical Summary

Problems solved by technology

In this context, in order to realize the deployment of massive MIMO communication systems, the problem of reducing the system's available information rate caused by pilot pollution needs to be taken seriously

Method used

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  • A Novel Pilot Allocation Method Applicable to Large-Scale Mimo Cellular Networks
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  • A Novel Pilot Allocation Method Applicable to Large-Scale Mimo Cellular Networks

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Embodiment

[0066] Such as Figure 4 As shown, the present invention discloses the following steps:

[0067] Step 1. Collect the channel state information of all Q cells. Each cell contains K user terminals. Collect the large-scale channel between the kth user terminal UT and the qth base station in the pth cell. Coefficient β ,q , where p,q=1,2,...,Q, the kth user terminal UT in the pth cell is denoted as UT;

[0068] Step 2, initialize parameters: initialize sampling scale S=50, quantile coefficient ρ=0.2, current iteration index n=1, maximum number of iterations N=20, and initialize Q K-order probability matrices each element in in is the probability of assigning the lth pilot sequence to the user terminal UT. Initialize the number of elite samples Indicates a round up operation. Initialize the maximum system information rate r best =0, optimal pilot assignment matrix A best = φ;

[0069] Step 3, generate the probability distribution P(·; π) of the pilot assignment indica...

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Abstract

The invention discloses a new pilot frequency allocation method suitable for a large-scale MIMO cellular network, the method comprises the following steps: step (1) acquiring channel state informationbetween a base station and a user in the base station; step (2) initializing related parameters needed for iteration; step (3) randomly extracting candidate solutions from parameterized distribution;step (4) selecting a current optimal candidate solution; step (5) judging whether a maximum iteration times is reached, if so, stopping and outputting a pilot frequency allocation matrix; step (6) ifnot, updating the parameters based on elite extraction and skipping to the step (3). The invention, based on a cross-entropy optimization tool, provides a pilot frequency allocation method for reducing influence caused by pilot contamination in a large-scale MIMO system, and maximization of a system attainable information rate is realized.

Description

technical field [0001] The invention belongs to the technical field of wireless communication and communication signal processing, and in particular relates to a novel pilot allocation method suitable for massive MIMO cellular networks. Background technique [0002] Massive MIMO (Multiple-Input Multiple-Output) technology uses a large number of antennas in the base station to form a giant antenna array, which can greatly improve the spectrum efficiency and energy efficiency of the cellular mobile network. It is the core of the 5G mobile communication network. Physical layer core technology. Based on massive MIMO technology, non-correlated noise and interference within the base station can be eliminated. However, since the orthogonal pilots are multiplexed in multiple base stations, the resulting interference between base stations cannot be eliminated, and this phenomenon is generally called "pilot contamination". Pilot contamination reduces the user's signal-to-interferenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04B7/0413
CPCH04B7/0413H04L5/0048
Inventor 夏鹏锐陈曦钟橙于俊
Owner CHINA INFOMRAITON CONSULTING & DESIGNING INST CO LTD
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