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Millimeter wave channel estimation method of multiuser MIMO system

A channel estimation and millimeter wave technology, applied in channel estimation, diversity/multi-antenna systems, transmission systems, etc., can solve the problems of long training time, consumption, and high training overhead

Inactive Publication Date: 2017-03-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the existing methods still have too much training overhead and take a long time to train, and some algorithms also need to establish a feedback channel between the base station and the user end, which consumes more resources.

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  • Millimeter wave channel estimation method of multiuser MIMO system
  • Millimeter wave channel estimation method of multiuser MIMO system
  • Millimeter wave channel estimation method of multiuser MIMO system

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0044] In the simulation, it is assumed that the base station of the millimeter wave system uses N BS = 64 uniform linear array antennas, serving U = 8 mobile users, each mobile terminal uses N MS = 32 Uniform Linear Array Antenna, M MS = 1 RF chain, and the distance between adjacent antennas is half the wavelength of the signal. The AoA and AoD of the millimeter wave channel are distributed in [0,2π], and the complex gain α u,l Is a random variable that obeys a circular symmetric Gaussian distribution α u,l ~CN(0,N BS N MS / ρ), ρ=(4πDf c / c) 2 , D represents the distance between MS and BS, f c Indicates the carrier frequency, and c indicates the speed of light. Suppose D=50m, f c = 28GHz. There are L=13 scattering clusters between MS and BS, L u 1 or 2. The number T of pilots is 2, 3, 6, and 8 respectively. The regular coefficient is μ=3×10 -3...

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Abstract

The invention belongs to the technical field of millimeter wave communication, and particularly relates to a method for jointly estimating multiuser downlink channels by use of CANDECOMP / PARAFAC decomposition (CP decomposition). Through a new layered pilot frequency transmission scheme, a training stage comprises a series of frames, each frame is divided into some subframes and in each subframe, all users use a common wave beam forming vector and transmits own pilot frequency information. In this way, a signal received by a base station can form a three-order tensor, then through the CP decomposition, the three-order tensor is decomposed into a series of one-order tensor linear combinations, and through a decomposed parameter matrix, the channel is estimated.

Description

technical field [0001] The invention belongs to the technical field of millimeter wave communication, and in particular relates to a method for jointly estimating multi-user downlink channels by using CANDECOMP / PARAFAC decomposition (CP decomposition). Background technique [0002] Millimeter wave communication is a very promising technology in future 5G networks. It even has the potential to deliver gigabit-per-second rates by taking advantage of the large bandwidth in the mmWave frequency band, thus attracting a lot of attention. However, communicating in such a high frequency band will cause high signal attenuation and absorption. In order to compensate for the severe path loss, both the base station and the user end need to use large-scale antenna arrays to increase link gain by beam steering. However, an accurate beamforming precoding matrix requires complete channel state information (CSI), which is a great challenge for millimeter-wave channels with large-scale anten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04B7/04
CPCH04L25/0204H04B7/0413
Inventor 方俊崔星星周舟
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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