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Channel evaluation method for orthogonal frequency division multiplex system

A channel estimation and orthogonal frequency division technology, applied in multi-frequency code systems, baseband system components and other directions, can solve problems such as poor accuracy and low complexity, and achieve the effect of improving accuracy and reducing the impact of noise

Inactive Publication Date: 2007-06-27
ZTE CORP
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of the LS estimation in the prior art that are greatly affected by Gaussian white noise and inter-subcarrier interference and the accuracy of the linear weighted interpolation method is poor, a new channel estimation method is proposed. Based on iterative LS and fractal interpolation, the multipath fading channel can be estimated more accurately, and the complexity is low, easy to implement

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  • Channel evaluation method for orthogonal frequency division multiplex system
  • Channel evaluation method for orthogonal frequency division multiplex system
  • Channel evaluation method for orthogonal frequency division multiplex system

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Embodiment Construction

[0042] The implementation of the technical solution will be further described in detail below in conjunction with the accompanying drawings.

[0043] The method of the present invention comprises:

[0044] (a) Obtain the channel estimation value of the pilot subcarrier by using the iterative LS method;

[0045] (b) Obtain the channel estimation value of the whole channel through fractal interpolation.

[0046] In described step (a), further comprise the following steps:

[0047] (a1) Obtain the channel frequency domain response of the pilot subcarrier position by the LS method

[0048] (a2) Yes Perform IFFT transformation of M points to obtain the time domain channel response of the pilot subcarrier then to Set the elements of n≥L to 0, and get h ^ p 1 ( n ) = h p ...

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Abstract

The invention discloses a channel estimation method of the orthogonal frequency division multiplexing system, including the following steps: using LS iterative method to get the channel estimation value of pilot subcarrier, and getting the estimate value of entire channel through fractal interpolation. This invention can lower the impact of white noise during the process of iterative LS estimation, better portray the multi-path fading by fractal methods during the process of fractal interpolation, adaptively track the channel changes, which performance will be significantly better than the traditional estimations, and complexity is less. It is applicable to not only the slow fading channel, but also the fast one, which can estimate the fading channel parameters more accurately in the environment of channel fast fading and depth decline.

Description

technical field [0001] The invention belongs to the field of wireless transmission of information, especially information transmission technology in applications such as mobile communication and digital television, and specifically relates to a channel estimation method in a mobile communication system, especially to a wireless communication system of an Orthogonal Frequency Division Multiplexing (OFDM) system. channel estimation method, Background technique [0002] OFDM technology has the advantages of high spectral efficiency and anti-multipath effect, so it will be a very promising technology in the future wireless communication, and it has been widely concerned and researched by people. European Terrestrial Digital Video Broadcasting (DVB-T), Digital Video Broadcasting / Digital Voice Broadcasting (DVB / DAB), HiperMAN / LAN all use OFDM transmission technology, and IEEE802.11a also uses OFDM as a wireless LAN transmission technology. [0003] At the receiving end of the OFD...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 余秋星张学林刘巧艳王衍文铁敏豪
Owner ZTE CORP