Method for generating preamble symbol and method for generating frequency domain OFDM symbol

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

Active Publication Date: 2015-10-28
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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  • Abstract
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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 de

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  • Method for generating preamble symbol and method for generating frequency domain OFDM symbol
  • Method for generating preamble symbol and method for generating frequency domain OFDM symbol
  • Method for generating preamble symbol and method for generating frequency domain OFDM symbol

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Embodiment Construction

[0036] 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.

[0037] In view of the above problems, the inventor provided a method for generating preamble symbols in a physical frame and a method for generating OFDM symbols in the frequency domain after research, so as to ensure that the receiving end can still process received signals within the range of carrier frequency deviation from -500kHz to 500kHz.

[0038] 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.

[0039] Such as figure 1 What is shown is a schematic flowchart of a specific embodiment of a method for generating a frequency-domain OFDM symbol acco...

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Abstract

The invention discloses a method for generating a preamble symbol and a method for generating a frequency domain OFDM symbol. The method for generating the frequency domain OFDM symbol comprises the following steps: respectively generating a fixed sequence and a signaling sequence on a frequency domain; filling an effective subcarrier with the fixed sequence and the signaling sequence, wherein the fixed sequence and the signaling sequence are in odd-even staggered arrangement; and respectively filling the two sides of the effective subcarrier with a zero sequence subcarrier so as to form the frequency domain OFDM symbol with a predetermined length. According to the technical scheme provided by the invention, the problem of failure probability of the preamble symbol in low-complexity receiving algorithm detection in case of a frequency selective fading channel in a conventional DVB_T2 standard or 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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IPC IPC(8): H04L5/00H04L27/26
CPCH04L27/2607
Inventor 张文军徐洪亮黄戈何大治管云峰
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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