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Channel Estimation Method and Estimation Device for Mobile Orthogonal Frequency Division Multiplexing System

A channel estimation and orthogonal frequency division technology, applied in baseband systems, transmission systems, digital transmission systems, etc., can solve the problems of inability to effectively track channel dynamic changes, channel estimation, limited system performance, and inability to correct errors, and achieve real-time Correction gain, accurate channel estimation results, and the effect of eliminating measurement errors

Active Publication Date: 2022-03-18
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the existing channel estimation method cannot correct errors, resulting in limited system performance, and cannot effectively track channel dynamic changes to complete channel estimation, the present invention provides a channel estimation method for mobile OFDM systems and its estimation device

Method used

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  • Channel Estimation Method and Estimation Device for Mobile Orthogonal Frequency Division Multiplexing System
  • Channel Estimation Method and Estimation Device for Mobile Orthogonal Frequency Division Multiplexing System
  • Channel Estimation Method and Estimation Device for Mobile Orthogonal Frequency Division Multiplexing System

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Embodiment 1

[0081] see figure 1 , figure 2 as well as image 3, this embodiment provides a channel estimation method for a mobile OFDM system, which can effectively track fast time-varying channel changes in a high-speed mobile environment, eliminate measurement errors, estimate time-varying noise, and ensure System stability, improving channel estimation accuracy, and methods for improving system communication quality. In this embodiment, the channel estimation method mainly includes the following steps: step (1): adding pilot frequency; step (2): establishing a system transmission model; step (3): establishing an improved AUKF prediction and updating equation, and outputting The next symbol estimation point; step (4): calculating the frequency domain channel response matrix. These steps are described in more detail next.

[0082] In step (1), pilot symbols are inserted into the data symbols of each subframe in the transmitted signal at equal intervals to form a block pilot structur...

Embodiment 2

[0143] This embodiment provides a channel estimation device for a mobile OFDM system, which is applied to the channel estimation method for a mobile OFDM system in Embodiment 1, and includes a pilot Adding module, system transmission model building module, state space model building module, state prediction equation building module, state update equation building module, channel response matrix calculation module in frequency domain and judging module.

[0144] The pilot adding module is used for inserting pilot symbols into the data symbols of the subframe in the transmitted signal at equal intervals to form a block pilot structure. Wherein, the transmitted signal includes multiple subframes, and each subframe includes multiple data symbols. The pilot adding module can effectively overcome the frequency selective fading and reduce the large Doppler frequency shift in the fast time-varying channel.

[0145] The system transmission model building module is used to establish th...

Embodiment 3

[0149] This embodiment provides a channel estimation device for a mobile OFDM system, which applies the channel estimation method for a mobile OFDM system in Embodiment 1. The channel estimation device may exist in the form of chip hardware, or in the form of controller hardware, and may also be realized by multiple modules. In this embodiment, the channel estimation device includes a pilot adding unit, a system establishing unit, an equation establishing unit and a calculating unit. The pilot adding unit is used for adding pilots, which is used in step (1) in Embodiment 1. The system building unit is used to build a system transmission model, which is used to realize step (2) in Embodiment 1. The equation establishment unit is used to establish an improved AUKF prediction, update the equation, and output the next symbol estimation point, which is used to realize step (3) in Embodiment 1. The calculation unit is used to calculate the channel response matrix in the frequency ...

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Abstract

The invention discloses a channel estimation method and an estimation device for a mobile orthogonal frequency division multiplexing system. The method includes: (1) inserting pilot symbols into the data symbols of each subframe in the transmitted signal at equal intervals to form a block pilot structure; (2) establishing a system transmission model; (3) establishing a state space model first, and then Obtain the state prediction equation and the state update equation; (4) calculate the channel response matrix in the frequency domain, and finally judge whether to complete the channel estimation of a subframe, if yes, continue to perform the channel estimation of the next subframe, otherwise proceed to step (1), and Until the channel estimation of all subframes is completed. The invention solves the problem of the nonlinear channel state space model, eliminates the measurement error caused by factors such as temperature, humidity and wind force in the high-speed environment, suppresses the divergence of the filter, enhances the system stability, improves the channel estimation accuracy, and guarantees the communication quality of the OFDM system. Respond to data communication requests.

Description

technical field [0001] The present invention relates to a channel estimation method in the field of wireless communication, in particular to a channel estimation method for a mobile OFDM system, and also to a mobile OFDM system using the method channel estimation device. Background technique [0002] With the rapid development of high-speed railways, the gradual and in-depth research of unmanned vehicles and unmanned aircraft, and the improvement of users' demand for mobile communications, high-speed data communication services have become an indispensable part of people's daily life. In a high-speed mobile environment, due to the combined effects of multipath and Doppler effects, wireless channels in high-speed environments will exhibit frequency-domain selective fading and fast time-varying characteristics. In a low-speed scenario, orthogonal frequency division multiplexing (OFDM) subcarriers are basically orthogonal, and interference between carriers can be ignored. How...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04B17/391
CPCH04L25/0226H04L25/0242H04B17/391
Inventor 张红伟戚晓东谢国豪崔逊龙张旭
Owner ANHUI UNIVERSITY