Multi-cell joint pilot frequency distribution method in large-scale MIMO system
A pilot allocation and multi-cell technology, applied in the field of communication, can solve the problems of high time complexity and low average channel capacity, and achieve the effects of reducing time complexity, increasing average channel capacity, and improving average channel capacity performance
Active Publication Date: 2017-05-31
XIDIAN UNIV
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[0004] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, and propose a multi-cell joint pilot allocation method in a massive MIMO system, which is used to solve the problems of low system average channel capacity and Technical problems with high time complexity
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[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0022] refer to figure 1 , the implementation steps of the present invention are as follows:
[0023] Step 1, set communication scene parameters.
[0024] Let the number of cells L=3, each cell includes a base station and K=3 single-antenna users, and each base station and user includes an orthogonal pilot group F={φ 1 ,…,φ p ,…,φ 3}, φ p is the pth pilot frequency, and the value of p is 1-3.
[0025] Step 2: Information exchange is performed between each base station and users first, the base station obtains the user location information of the cell, and then the base station location information and user location information are exchanged between the base stations, and all user location information U and base station location information B are obtained.
[0026] Each base station first interacts with users in the cell where the base st...
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The invention provides a multi-cell joint pilot frequency distribution method in a large-scale MIMO system. The technical problems of low average system channel capacity and high time complexity. The method comprises the following steps: 1, setting communication scene parameters; 2, obtaining position information of all base stations and all users through the information interaction between the base stations and the users, and between the base stations; 3, calculating large-scale fading information of all users according to the position information of the base stations and the users to obtain a useful information set and a potential interference set; and 4, continuously performing pilot frequency distribution on users corresponding to elements with minimum values in the useful information set and the users with minimum interferences in the users according to the useful information set and the potential interference set, and then updating the useful information set and the potential interference set until the pilot frequency distribution of all users is completed. By adoption of the multi-cell joint pilot frequency distribution method provided by the invention, the average system channel capacity is effectively improved, and the time complexity of the pilot frequency distribution is reduced.
Description
technical field [0001] The invention belongs to the technical field of communications, and relates to a pilot allocation method, in particular to a multi-cell joint pilot allocation method in a massive MIMO system under a time division duplex mode. Background technique [0002] Multiple Input Multiple Output MIMO (Multiple Input Multiple Output) technology refers to the use of multiple transmitting antennas and receiving antennas at the transmitting end and receiving end, respectively, so that signals are transmitted and received through multiple antennas at the transmitting end and receiving end, thereby improving communication quality. Massive MIMO refers to a technology that configures dozens or even hundreds of antennas at the base station and serves multiple mobile terminals at the same time. As one of the key technologies of 5G, in multi-cell communication scenarios, it is generally necessary to obtain channel state information Using the traditional way of estimating t...
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IPC IPC(8): H04L5/00H04B7/0413
CPCH04B7/0413H04L5/0048
Inventor 杜婷王江涛王勇超
Owner XIDIAN UNIV