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A Channel Estimation Method for Large-scale mu-mimo System

A channel estimation and large-scale technology, applied in the field of MU-MIMO system signal processing, can solve problems such as difficult to obtain, and achieve the effects of easy manipulation, low computational complexity, and improved accuracy

Active Publication Date: 2018-08-17
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods require channel statistics, which are difficult to obtain in practice.

Method used

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  • A Channel Estimation Method for Large-scale mu-mimo System
  • A Channel Estimation Method for Large-scale mu-mimo System
  • A Channel Estimation Method for Large-scale mu-mimo System

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Embodiment

[0043] figure 2 Shown is a schematic diagram of a linear antenna array model in an embodiment of the present invention, and the channel estimation method based on a large-scale MU-MIMO system of the present invention is used in a large-scale MU-MIMO system in which the receiving antenna array is a linear antenna array, specifically including the following step:

[0044] Step 1 In the linear antenna array of the embodiment of the present invention, the number of users is K=8, the number of base station antennas is M=128, and the number of multipaths is P=5. Generate Orthogonal Pilots as a transmit signal. In this embodiment, the orthogonal pilots are generated by spreading codes,

[0045]

[0046] Then its received signal matrix at the base station is Y(t)=H(t)S+N(t), where, Denotes the flat fading channel matrix of the system, represents the noise matrix.

[0047] Step 2 is to avoid the interference between different users, the present invention utilizes the ortho...

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Abstract

The invention discloses a channel estimation method for a large-scale MU-MIMO (Multi-User-Multi-Input Multi-Output) system. The method comprises the following steps: (1) generating orthogonal pilot signals by designing to avoid inter-user interference; (2) eliminating inter-user interference at a receiving end by using the property of orthogonal pilots; (3) calculating a factor loading matrix by using a principal component method; (4) estimating a public factor; and (5) removing noise by using the relevance of channels and the irrelevance of noise to realize channel estimation. By adopting the channel estimation method, the estimate value of a channel matrix can be obtained; and the method has the advantages of low calculation complexity and high estimation precision, and does not need channel statistical information. Moreover, the method has high practicability, and can be applied to estimation of various relevant system parameters.

Description

technical field [0001] The invention belongs to the technical field of MU-MIMO system signal processing, and more specifically relates to a large-scale MU-MIMO system channel estimation method. Background technique [0002] The MIMO technology can improve the capacity of the wireless channel, that is, the utilization rate of the spectrum can be significantly improved without increasing the bandwidth and the transmission power of the antenna. However, the traditional MIMO technology still cannot meet the demands of the contemporary exponentially increasing wireless transmission rate. In 2010, Bell Labs proposed the concept of massive MIMO. Compared with traditional MIMO, massive MIMO increases the number of antennas by an order of magnitude, and base stations use hundreds of antennas to provide services to users at the same time. Massive MIMO inherits all the advantages of MIMO systems and greatly improves them. Massive MIMO systems make communications more robust, secure,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0452H04L25/02
CPCH04B7/0452H04L25/0242H04L25/0246
Inventor 彭薇江涛魏肖
Owner HUAZHONG UNIV OF SCI & TECH
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