Method for estimating channel based on orthogonal frequency division multiplexing system

An orthogonal frequency division, multiple-input and multiple-output technology, applied in the field of channel estimation, can solve the problems of estimation accuracy and implementation complexity, inability to compensate subcarrier phase offset, etc., to reduce Gaussian white noise, improve accuracy, and facilitate Achieved effect

Inactive Publication Date: 2007-11-21
阳信县润田棉业有限公司
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a channel estimation method for a multiple-input multiple-output OFDM system, to solve the contradiction between the estimation ac

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  • Method for estimating channel based on orthogonal frequency division multiplexing system
  • Method for estimating channel based on orthogonal frequency division multiplexing system
  • Method for estimating channel based on orthogonal frequency division multiplexing system

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[0031] The implementation of the technical solution will be further described in detail below with reference to the accompanying drawings.

[0032] In order to overcome the contradiction between the estimation accuracy and the realization complexity of the existing MIMO-OFDM communication system channel estimation method, and the defect that the subcarrier phase offset caused by the non-ideal synchronization cannot be compensated, the present invention proposes a method that can A channel estimation method in a multiple-input multiple-output orthogonal frequency-division multiplexing system, which satisfies a certain estimation accuracy, can compensate for the subcarrier phase offset caused by system non-ideal synchronization or channel variation, and is easy to implement.

[0033] For the convenience of explanation, the following terms are defined:

[0034] Training pilot symbol: a symbol known to both ends of the transceiver and transmitted by a specific subcarrier of the fi...

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Abstract

The method comprises: using the least squared method to get the training pilot symbol location channel response HPji relating to the system receiving antenna; after interpolation, getting the channel response value Hji of all subcarrier location between the antenna pairs, and making the inverse Fourier transform for all response channel value Hji to get the impulse response of multipath hji; selecting the important path to get channel impulse response hji'; making Fourier transform for hji to the channel response Hji'; traversing all receiving antenna pairs to the channel response estimation initial value of the current channel between all receiving antenna pairs; using the reference pilot symbol of data frame to estimate the offsetPhiji of channel phase; using thePhiji to compensate the Hji' to get the final channel response estimation H of the multi-input multi-output (MIMO) OFDM system.

Description

technical field [0001] The present invention relates to a channel estimation method in a mobile communication system, in particular to a channel estimation method of a system combined with orthogonal frequency division multiplexing technology in the field of wireless transmission of information. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) can effectively resist the influence of frequency selective fading by converting the frequency selective multipath fading channel into a flat channel in the frequency domain, while MIMO (Multiple-Input Multiplexing) -Output, multiple input and multiple output) technology can generate independent parallel channels in space to transmit multiple data streams at the same time, which increases the transmission rate of the system. In future broadband wireless communication systems, multipath fading channels and bandwidth efficiency are the two most severe challenges. ...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02
Inventor 余秋星张学林刘巧艳王衍文
Owner 阳信县润田棉业有限公司
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