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Spatial domain non-uniform pilot design method

A pilot design and non-uniform technology, applied in the field of communication, can solve problems affecting the quality of CSI estimation

Active Publication Date: 2019-10-01
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in relatively mature research, the method of inserting pilots at equal intervals in the airspace has been adopted, but the pilot spacing is constrained by the sampling theorem under this method, and reducing the number of samples will seriously affect the quality of CSI estimation

Method used

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  • Spatial domain non-uniform pilot design method
  • Spatial domain non-uniform pilot design method

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Embodiment 1

[0045] The embodiment of the present invention proposes a method for designing non-uniform pilots in the space domain, see figure 1 , the method includes the following steps: Knowing the total number of transmitting antennas N t and the number of antennas N used to transmit the pilot p ;

[0046] Step 101: According to the autocorrelation matrix of the antennas in the transmitting antenna array, based on the criterion of satisfying the signal independence and maximizing the sparse characteristics, select the channel sparse matrix from the transmitting antenna to the receiving antenna

[0047] Step 102: If the energy distribution of the pilot symbols on the pilot antenna is given, based on the criterion of minimizing the correlation between the channel sparse base matrix Ψ and the pilot symbol matrix X, a pilot symbol insertion model is obtained, where the pilot symbol matrix is the pilot symbol sequence;

[0048] If the pilot symbol insertion model is given, based on ...

Embodiment 2

[0052] In this embodiment of the present invention, taking the energy distribution of known pilot symbols as an example, the specific implementation process of the airspace non-uniform pilot design method of the present invention is introduced in detail, see figure 2 , including the following steps: Knowing the total number of transmitting antennas N t and the number of antennas N used to transmit the pilot p ;

[0053] Step 201: Calculate the antenna autocorrelation matrix R t .

[0054] In this step, the antenna autocorrelation matrix in the antenna array Let the autocorrelation matrix between horizontal and vertical antennas be R x and R y ,Have , since the antenna spacing of the two-dimensional large-scale antenna array is less than one wavelength, there is a certain correlation between the channels from different antennas to the receiving antenna, and the correlation can be expressed by N t ×N t Dimensional autocorrelation coefficient matrix, the (i, j) element...

Embodiment 3

[0082] In this embodiment of the present invention, the known pilot symbol insertion model is taken as an example to introduce in detail the specific implementation process of the airspace non-uniform pilot design method of the present invention, see Figure 6 , including the following steps: Knowing the total number of transmitting antennas N t and the number of antennas N used to transmit the pilot p ;

[0083] Step 601: Calculate the antenna autocorrelation matrix R t .

[0084] In this step, the antenna autocorrelation matrix in the antenna array Let the autocorrelation matrix between horizontal and vertical antennas be R x and R y ,Have

[0085] Step 602: Select a channel sparse base matrix according to the antenna autocorrelation matrix.

[0086] In this step, assuming that the receiving antenna of each user is a single antenna, the channel from the base station to each user Modeling has: h=(R t ) 1 / 2 h iid ,in It is a vector that represents the random...

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Abstract

The invention provides a space-domain non-uniform pilot design method which includes the following steps: S1: according to an autocorrelation matrix of an antenna, selecting a channel sparse base matrix from a sending antenna to a receiving antenna; S2: if energy distribution of pilot symbols on a pilot antenna is given, based on a criterion of correlation between a minimized channel sparse matrix and a pilot symbol matrix, obtaining a pilot symbol insert model; if the pilot symbol insert model is given, based on a criterion of correlation between the minimized channel sparse matrix and the pilot symbol matrix, obtaining the energy distribution of the pilot symbols on the pilot antenna; S3: according to the energy distribution of the pilot symbols on the pilot antenna and the pilot symbol insert model, sending a pilot symbol sequence; and S4: a receiving end adopting a channel reconstruction algorithm to estimate channel information according to the channel sparse base matrix and received pilot signals. The space-domain non-uniform pilot design method is capable of using minimum pilot overhead to achieve an objective of high-probability restoration of complete channel state information.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for designing an airspace non-uniform pilot. Background technique [0002] In multi-user MIMO application scenarios, the improvement of system performance depends on the acquisition of the channel state of each user. When the channel state information (CSI) of each user is perfectly obtained, the base station can use beamforming technology to avoid the interference of users who share spectrum resources. interfere with each other. The base station obtains CSI information. For a time division duplex (TDD) system, channel reciprocity can be used. Users send pilot training signals to the base station through the uplink, and the pilot overhead is proportional to the number of users. For a frequency division duplex (FDD) system, if the traditional channel estimation method is adopted, the base station sends pilot signals to users through the downlink, and the pilot ove...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04L25/03
Inventor 王莹徐晶王爱玲
Owner BEIJING UNIV OF POSTS & TELECOMM
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