Method for generating frequency domain OFDM symbol

A frequency domain and symbol technology, applied in the field of generating preamble symbols in physical frames, can solve the problems of receiving algorithm detection failure, lack of cyclic prefix, inability to apply coherent detection, etc., to solve the problem of frequency domain channel estimation performance degradation, good decimal The effect of frequency doubling offset estimation performance and good timing synchronization performance

Inactive Publication Date: 2017-03-22
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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Problems solved by technology

[0010] The problem solved by the present invention is that in the current DVB_T2 standard and other standards, there is no cyclic prefix in the DVB_T2 time domain structure, which cannot be applied to coherent detection, and the preamble symbol has a low probability of failure in the detection of low-complexity receiving algorithms under complex frequency selective fading channels. question

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  • Method for generating frequency domain OFDM symbol
  • Method for generating frequency domain OFDM symbol
  • Method for generating frequency domain OFDM symbol

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Embodiment Construction

[0034] The inventors found that in the current DVB_T2 standard and other standards, there is no cyclic prefix in the DVB_T2 time domain structure, and there is a problem of failure probability in the low-complexity reception algorithm detection of the preamble symbols in the frequency selective fading channel.

[0035] In view of the above problems, the inventor provides a method for generating a leading symbol in a physical frame after research. A cyclic prefix is ​​set in the time domain structure, which solves the problem of channel estimation performance degradation in the frequency domain, and uses all or part of the data segment of the cyclic prefix to generate a modulated signal, so that the generated preamble symbols have good small frequency offset and timing synchronization performance.

[0036] By selecting different combinations of the cyclic prefix length and the modulation signal length, so that the finally formed preamble symbols transmit signaling information t...

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Abstract

The invention discloses a method for generating a frequency domain OFDM symbol. The method is characterized by further comprising the following steps before discrete Fourier transform is performed on the frequency domain OFDM symbol with a predetermined length to obtain a time domain OFDM symbol: determining an average power ratio of a fixed sequence to a signaling sequence; separately generating the fixed sequence and the signaling sequence on the frequency domain according to the average power ratio; filling the fixed sequence and the signaling sequence on an effective subcarrier, wherein the fixed sequence and the signaling sequence are arranged in an odd-even stagger manner; and respectively filling zero sequence subcarriers on both sides of the effective subcarrier to form the frequency domain OFDM symbol with the predetermined length. The problem that a failure probability is detected by a low- complexity receiving algorithm of a pilot symbol in a frequency selective fading channel in the existing DVB_T2 standard is solved.

Description

[0001] This application is a divisional application of the original application, the application number of the original application is 201410229558.7, the application date is May 28, 2014, and the name of the invention is "Generation Method of Leading Symbol in Physical Frame". technical field [0002] The invention relates to the technical field of wireless broadcast communication, in particular to a method for generating a leading symbol in a physical frame. 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 provide an accurate and efficient carrier spectrum estimation method to accurately estimate and correct the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04J13/00
CPCH04J13/0059H04L27/26
Inventor 张文军黄戈邢观斌
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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