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Method and device for getting channel time domain response, OFDM fine symbol synchronizing method and device

A technology of channel time domain response and channel frequency domain response, applied in the field of communication, can solve problems such as large resource consumption and achieve the effect of meeting reliability requirements

Inactive Publication Date: 2007-11-07
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
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Problems solved by technology

[0007] Therefore, during the process of creating the present invention, the inventor found that at least the following problems existed in the prior art: using the OFDM symbol fine synchronization method provided by the prior art, It is necessary to perform IFFT on channel frequency domain response estimation, and IFFT calculation requires a large number of resources such as calculators and storage units, so resource consumption is large

Method used

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  • Method and device for getting channel time domain response, OFDM fine symbol synchronizing method and device
  • Method and device for getting channel time domain response, OFDM fine symbol synchronizing method and device
  • Method and device for getting channel time domain response, OFDM fine symbol synchronizing method and device

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Embodiment Construction

[0027] Embodiments of the present invention provide a fine synchronization method and device for OFDM symbols, and a method and device for obtaining channel time domain response with coarse time resolution in OFDM. In order to make the technical solutions of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0028] Please refer to FIG. 1 , which is a flowchart of an embodiment of an OFDM symbol fine synchronization method according to the present invention. The OFDM symbol fine synchronization method specifically includes:

[0029] Step 101: Obtain the frequency domain response of the channel corresponding to the OFDM symbol;

[0030] The frequency domain response of the channel corresponding to the OFDM symbol can be obtained by using frequency domain interpolation in channel estimation. The frequency domain interpolation may adopt...

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Abstract

A method for obtaining time domain response of channel includes carrying out filter set treatment on channel frequency domain response corresponding to symbol of orthogonal frequency division multiplexing to obtain corresponding channel time domain response, setting resolution ratio of channel time domain response to be greater than time resolution ratio of channel time domain response obtained by using channel frequency domain as IFFT transform and regulating position of fast Fourier transform window according to said channel time domain response.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an OFDM symbol fine synchronization method and its device, a method and its device for obtaining a channel time domain response with coarse time resolution in the OFDM. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology is a physical layer modulation technology widely used in broadband communication technologies such as terrestrial digital TV broadcasting, wireless local area network, and mobile phone TV broadcasting. In the baseband signal structure adopted by the OFDM technology, there is a cyclic prefix before each OFDM symbol, and the cyclic prefix is ​​the same as the last part of the OFDM symbol. For example, in a mode of European standard terrestrial digital television broadcasting (DVB-T, Digital Video Broadcasting Terrestrial), an OFDM symbol with 8192 sampling points is adopted, a...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 胡宇鹏许树湛
Owner HUAWEI TECH CO LTD
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