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A Finite Feedback Hybrid Precoding Method Based on Millimeter Wave MIMO System

A precoding and millimeter-wave technology, which is applied in the field of mobile communication technology and multi-antenna, can solve the problems of impossibility, high computational complexity, and large channel matrix H dimension, achieving performance improvement, obvious performance, The effect of reducing computational complexity

Active Publication Date: 2020-06-23
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, the general limited feedback is to feed back the channel state information to the base station, and then the base station performs precoding design according to the channel state information, but in the millimeter-wave MIMO system or low-frequency MIMO system, due to the increase in the number of antennas, the channel matrix H The number of dimensions will also become very large, and the computational complexity of such limited feedback is very high
At the same time, it is impossible to realize in the actual scene

Method used

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  • A Finite Feedback Hybrid Precoding Method Based on Millimeter Wave MIMO System
  • A Finite Feedback Hybrid Precoding Method Based on Millimeter Wave MIMO System
  • A Finite Feedback Hybrid Precoding Method Based on Millimeter Wave MIMO System

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Embodiment 1

[0092] In a single-user millimeter-wave MIMO system, the number of base station antennas is set to 8×8 uniform planar array (UPA), that is, N t = 64 and number of radio frequency chains, and the number of user antennas is set to 4×4 uniform planar array (UPA), that is, N r = 16 and RF chain. It is assumed that each user's channel includes 8 clusters, and each cluster has 10 propagation paths, that is, the total number of propagation paths of the user is L=80. The number of data streams sent by the base station to the user is set to N s =1. All channel path gains α l Assuming it is independent and identically distributed the variance is Gaussian distribution. And assume that the azimuth of the beam arrival angle and departure angle is uniformly distributed in [0; 2π], and the elevation angle is in evenly distributed within. Set the noise variance to σ 2 =1, the SNR when drawing is defined as

[0093] Assume that the channel state information of the feedback cha...

Embodiment 2

[0096] In a single-user millimeter-wave MIMO system, the number of base station antennas is set to 8×8 uniform planar array (UPA), that is, N t = 64 and number of radio frequency chains, and the number of user antennas is set to 4×4 uniform planar array (UPA), that is, N r = 16 and RF chain. It is assumed that each user's channel includes 8 clusters, and each cluster has 10 propagation paths, that is, the total number of propagation paths of the user is L=80. The number of data streams sent by the base station to the user is set to N s =2. All channel path gains α l Assuming it is independent and identically distributed the variance is Gaussian distribution. And assume that the azimuth of the beam arrival angle and departure angle is uniformly distributed in [0; 2π], and the elevation angle is in evenly distributed within. Set the noise variance to σ 2 =1, the SNR when drawing is defined as

[0097] Assume that the channel state information of the feedback cha...

Embodiment 3

[0100] In a single-user millimeter-wave MIMO system, the number of base station antennas is set to 8×8 uniform planar array (UPA), that is, N t = 64 and number of radio frequency chains, and the number of user antennas is set to 4×4 uniform planar array (UPA), that is, N r = 16 and RF chain. It is assumed that each user's channel includes 8 clusters, and each cluster has 10 propagation paths, that is, the total number of propagation paths of the user is L=80. The number of data streams sent by the base station to the user is set to N s =1. All channel path gains α l Assuming it is independent and identically distributed the variance is Gaussian distribution. And assume that the azimuth of the beam arrival angle and departure angle is uniformly distributed in [0; 2π], and the elevation angle is in evenly distributed within. Set the noise variance to σ 2 =1, the SNR when drawing is defined as

[0101] Assume that the channel state information of the feedback cha...

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Abstract

The invention discloses a limiting feedback hybrid precoding method based on a millimeter wave MIMO system. The method comprises the following steps: S1: constructing an analog predefined codebook setand a codeword search method thereof; S2: storing the analog predefined codebook set and a digital predefined codebook set of the millimeter wave MIMO system in a base station and a user terminal atthe same time; S3: obtaining, by the user terminal, an analog precoding matrix FRF; S4: obtaining a baseband precoding matrix FBB according to the analog precoding matrix FRF and channel state information; S5: feeding back the beam indexes of the analog precoding matrix FRF and the digital precoding matrix FBB to the base station; and S6: obtaining, by the base station, the precoding matrix F=FRFFBB, and sending data to the user by using the precoding matrix F. The construction method of the analog predetermined code is obtained to obtain better performance.

Description

technical field [0001] The invention belongs to the field of mobile communication technology and multi-antenna technology, relates to a frequency-division duplex (FDD) system in the millimeter-wave frequency band, and proposes a millimeter-wave MIMO (Multiple-Input A limited feedback hybrid precoding method for Multiple-Output) systems. Background technique [0002] At present, with the rapid development of wireless communication technology and mobile Internet, people continue to put forward higher requirements for mobile communication speed. However, system resources such as available spectrum and transmit power in wireless communication systems are limited, which cannot meet the increasing rate requirements. mmWave communications have a large and untapped mmWave bandwidth compared to microwave communications used in most wireless applications and cellular systems. Although mmWave signals experience more free-space path loss, due to the short wavelength of mmWave bandwidt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456
CPCH04B7/0456
Inventor 尤若楠潘鹏张丹王海泉
Owner HANGZHOU DIANZI UNIV