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Downlink channel estimation method for use in FDD (Frequency Division Duplexing) large-scale MIMO (Multiple-Input Multiple-Output) system

A downlink and channel estimation technology, applied in transmission path sub-channel allocation, transmission system, baseband system, etc.

Active Publication Date: 2018-06-22
AIR FORCE EARLY WARNING ACADEMY
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Problems solved by technology

[0005] In the GlobalSIP International Conference in 2015, "Channel Estimation Using JointDictionary Learning in FDD Massive MIMO Systems" proposed to use the relationship between the uplink and downlink airspace channels, and use the compressed sensing processing framework to perform joint channel dictionary learning and channel estimation. ; But assuming that the sparse pattern of the uplink and downlink (also known as the sparse support set, that is, the location set of non-zero elements) is exactly the same, this ideal assumption does not match the actual situation

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  • Downlink channel estimation method for use in FDD (Frequency Division Duplexing) large-scale MIMO (Multiple-Input Multiple-Output) system
  • Downlink channel estimation method for use in FDD (Frequency Division Duplexing) large-scale MIMO (Multiple-Input Multiple-Output) system
  • Downlink channel estimation method for use in FDD (Frequency Division Duplexing) large-scale MIMO (Multiple-Input Multiple-Output) system

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[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0045] In order to solve the problems existing in the existing technology, it can be considered to use the correlation of the uplink and downlink airspace channels in the FDD system, and consider a more practical situation, that is, the angular offset and difference of the direction of arrival of the uplink and downlink, through the uplink Link channel estimation results to estimate the sparse s...

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Abstract

The invention discloses a downlink channel estimation method for use in an FDD (Frequency Division Duplexing) large-scale MIMO (Multiple-Input Multiple-Output) system. The method comprises the following steps: constructing an uplink pilot signal receiving model of the FDD large-scale MIMO system; performing compressed sensing channel estimation on an uplink space channel; acquiring a support set of the uplink space channel according to an estimated value of the uplink space channel, and estimating a support set of a downlink space channel according to the support set of the uplink space channel; constructing a downlink pilot signal receiving model of the FDD large-scale MIMO system; and performing downlink compressed sensing channel estimation based on estimation support set information ofthe downlink space channel. According to the method disclosed by the invention, a sparse support set of the downlink space channel is estimated according to an estimation result of the uplink space channel by means of the spatial correlation between the uplink channel and the downlink channel, thereby improving the performance of downlink channel estimation.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to a downlink channel estimation method in an FDD massive MIMO system. Background technique [0002] Massive multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) technology is an important core technology of 5G wireless communication system. Obtaining accurate channel state information is the key to improving the performance of massive MIMO systems. In a Frequency Division Duplexing (FDD) mode massive MIMO system, the original downlink channel estimation method in the Long Term Evolution (LTE) system faces great challenges. With the antenna As the number increases, the feedback overhead and pilot overhead will also increase sharply. Therefore, the problem of channel estimation for massive MIMO systems under FDD conditions is very important. [0003] In a massive MIMO system, generally dozens or even hundreds of antennas are installe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26H04L5/00
CPCH04L5/0048H04L25/0256H04L27/2675H04L27/2695
Inventor 吕伟王永良方其庆王晶晶郝媛张伟胡亚敏刘根刘庆华
Owner AIR FORCE EARLY WARNING ACADEMY
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