Generation method of preamble symbol and generation method of frequency-domain OFDM symbol

A technology of preamble symbols and symbols, applied in the field of wireless broadcast communication, can solve problems such as failure probability

Inactive Publication Date: 2017-04-26
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] The present invention solves the problem of the probability of failure in the low-complexity receiving algorithm detection of the preamble symbol in the frequency selective fading channel in the current DVB_T2 standard and other standards

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  • Generation method of preamble symbol and generation method of frequency-domain OFDM symbol
  • Generation method of preamble symbol and generation method of frequency-domain OFDM symbol
  • Generation method of preamble symbol and generation method of frequency-domain OFDM symbol

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Embodiment Construction

[0025] The inventors have found that in the current DVB_T2 standard and other standards, there is a problem of failure probability in the low-complexity receiving algorithm detection of preamble symbols in frequency-selective fading channels.

[0026] In view of the above problems, the inventor provided a method for generating preamble symbols in a physical frame after research, which ensures that the receiving end can still process received signals within the range of carrier frequency deviation from -500kHz to 500kHz.

[0027] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] Such as figure 1 What is shown is a schematic flowchart of a specific embodiment of a method for generating a preamble symbol in a physical frame according to the present invention. refer to figure 1 , the ge...

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Abstract

The invention discloses a generation method of a preamble symbol and a generation method of a frequency-domain OFDM symbol. The generation method of the preamble symbol in a physical frame comprises that a fixed sequence and a signaling sequence are generated in the frequency domain; the fixed sequence and the signaling sequence are filled to an effective subcarrier, and the fixed sequence and the signaling sequence are in odd / even or even / odd staggered arrangement; zero-sequence subcarriers are filled to the two sides of the effective subcarrier to form a frequency-domain OFDM symbol in a predetermined length; inverse discrete Fourier transform is carried out on the frequency-domain OFDM symbol to obtain a time-frequency OFDM symbol; a modulation signal of the time-frequency OFDM symbol is generated; and the preamble symbol is generated on the basis of the time-frequency OFDM symbol and the modulation signal. According to technical schemes of the invention, the problem that the preamble symbol may cause detection failure via a low-complexity reception algorithm in a frequency selective attenuation channel in present DVB_2 and other standards is solved.

Description

technical field [0001] The invention relates to the technical field of wireless broadcast communication, in particular to a method for generating a preamble symbol in a physical frame and a method for generating a frequency-domain OFDM symbol. Background technique [0002] Generally, in order for the receiving end of the OFDM system to correctly demodulate the data sent by the sending end, the OFDM system must realize accurate and reliable time synchronization between the sending end and the receiving end. At the same time, since the OFDM system is very sensitive to the frequency offset of the carrier, the receiving end of the OFDM system also needs to provide an accurate and efficient carrier spectrum estimation method to accurately estimate and correct the carrier frequency offset. [0003] At present, the method for realizing time synchronization between the transmitting end and the receiving end in the OFDM system is basically based on preamble symbols. The preamble sym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
CPCH04L25/03012H04L27/2602H04L27/261H04L27/2627
Inventor 张文军黄戈管云峰
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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