Frequency domain OFDM symbol generation method

A technology of frequency domain and symbols, applied in the field of wireless broadcast communication, can solve problems such as failure probability, and achieve the effect of facilitating decoding and demodulation

Inactive Publication Date: 2017-06-20
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention solves the problem of failure probability of preamble symbols in low-complexity receiving algorithm detection under frequency-selective fading channel in the current DVB_T2 standard and other standards

Method used

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  • Frequency domain OFDM symbol generation method
  • Frequency domain OFDM symbol generation method
  • Frequency domain OFDM symbol generation method

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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] like figure 1 What is shown is a schematic flowchart of a specific embodiment of a method for generating a frequency-domain OFDM symbol accordi...

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Abstract

The invention discloses a frequency domain OFDM symbol generation method. The frequency domain OFDM symbol generation method includes the 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 arranged in a parity-alternative way; and respectively filling two sides of the effective subcarrier with zero sequence subcarriers to form a frequency domain OFDM symbol with a preset length. The technical scheme of the frequency domain OFDM symbol generation method solves the problem of the failure probability, for a lead symbol, for low complexity reception algorithm detection under a frequency selective fading channel, in the present DVB_T2 standard and other standards.

Description

[0001] This application is a divisional application of the original application, the application number of the original application is 201410153040.X, the application date is April 16, 2014, and the invention name is "a method for generating leading symbols and a method for generating OFDM symbols in the frequency domain". technical field [0002] 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 [0003] 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 pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2607
Inventor 张文军徐洪亮黄戈
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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