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Preamble symbol generation method and frequency domain OFDM symbol generation method

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

Active Publication Date: 2015-09-30
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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  • Abstract
  • Description
  • Claims
  • 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

Method used

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  • Preamble symbol generation method and frequency domain OFDM symbol generation method
  • Preamble symbol generation method and frequency domain OFDM symbol generation method
  • Preamble symbol generation method and frequency domain OFDM symbol generation method

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Embodiment Construction

[0025] The inventors 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] like 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 generation...

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Abstract

The invention discloses a preamble symbol generation method in a physical frame and a frequency domain OFDM symbol generation method. The preamble symbol generation method in the physical frame comprises steps: fixed sequences and signaling sequences are generated respectively in the frequency domain; the fixed sequences and the signaling sequences fill effective sub carriers, and odd-even staggered arrangement exists between the fixed sequences and the signaling sequences; two sides of the effective sub carriers are filled with zero-sequence sub carriers respectively to form a frequency domain OFDM symbol with a preset length; discrete Fourier inverse transform is carried out on the frequency domain OFDM symbol to obtain a time domain OFDM symbol; a modulation signal of the time domain OFDM symbol is generated, and on the basis of the time domain OFDM symbol and the modulation signal, a preamble symbol is generated. The technical scheme of the invention solves the problem that in the current DVB_T2 standard and other standards, failure probability happens in the case of low-complexity receiving algorithm detection on the preamble symbol in a frequency selective fading channel.

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 张文军黄戈管云峰徐洪亮史毅俊郭序峰
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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