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Pilot sequence allocation method in massive multiple-input multiple-output system

A pilot sequence, multi-input technology, applied in the direction of pilot signal distribution, transmission system, digital transmission system, etc., can solve the problems of high complexity and cost, and achieve the effect of low operation complexity and good signal-to-interference-noise ratio

Active Publication Date: 2016-05-25
INST OF COMPUTING TECHNOLOGY - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

Although the above method can improve certain performance, the complexity cost is too high

Method used

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  • Pilot sequence allocation method in massive multiple-input multiple-output system
  • Pilot sequence allocation method in massive multiple-input multiple-output system
  • Pilot sequence allocation method in massive multiple-input multiple-output system

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Embodiment Construction

[0025] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0026] figure 1 It shows a schematic diagram of the cell structure and channels using MassiveMIMO. In the figure, the base station name corresponds to the cell name, and the uplink channel vector from user k in cell i to the base station in cell l is denoted as g ikl = Β ikl ·H ikl , Where β ikl Indicates the large-scale fading factor, h ikl Represents the small-scale fading vector. Unlike ordinary MIMO, in Massive MIMO, when the number of base station antennas M tends to infinity, the channels of different users in massive multi-antennas tend to be orthogonal (whether to the same base station or the channels of different base stations). The channels from a user to different base stations also tend to be orthogonal. In other words, if the two channel vectors versus The subscripts of are not exactly the same, i.e. (j 1 , K 1 , L j )≠(j 2 , K 2 , L 2 ), ...

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Abstract

The invention provides a pilot sequence construction method for a massive multiple-input multiple-output system. The method comprises the steps of firstly, determining a matrix comprising constructed pilot sequences, so as to be used as a matrix of an original pilot sequence; then, rearranging all pilot sequences in the original pilot matrix so as to obtain a plurality of different orthogonal matrixes; and finding out a plurality of matrixes with low correlation from the new orthogonal matrixes and the original pilot matrix, so as to be used as the pilot matrixes allocated to a wireless network.

Description

Technical field [0001] The present invention relates to wireless channel estimation, in particular to a method for allocating wireless communication pilots. Background technique [0002] Massive Multiple-Input Multiple-Output (Massive Multiple-Input Multiple-Output, Massive MIMO), also known as massive multiple antenna, refers to a transmission mechanism in which the number of input and output antennas configured at the base station is far greater than the number of users served. Hundreds of antennas (128, 256 or more) are installed in the base station, so that a large number of antennas can be used to send and receive data for the same user at the same time. Without changing the traditional cellular system, the large-scale multi-antenna system can effectively reduce inter-user interference and inter-cell interference, and greatly improve spectrum efficiency by using good spatial freedom; and by using MIMO diversity and multiplexing technology , Can reduce data transmission powe...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04B7/04
CPCH04B7/0413H04L5/0048H04L5/006H04L5/0073
Inventor 孙布勒周一青田霖石晶林
Owner INST OF COMPUTING TECHNOLOGY - CHINESE ACAD OF SCI
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