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Generation method for preamble in physical frame

A preamble symbol and physical frame technology, applied in the direction of digital transmission system, multi-frequency code system, electrical components, etc., can solve the problems of reception algorithm detection failure, inability to apply coherent detection, no cyclic prefix, etc., and achieve frequency domain channel estimation Effect of performance degradation, good timing synchronization performance, good fractional frequency offset estimation performance

Active Publication Date: 2017-05-24
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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  • Generation method for preamble in physical frame

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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 generation method for a preamble in a physical frame. The method comprises the following steps: inverse discrete Fourier transform of a frequency-domain OFDM symbol with a preset length is carried out to obtain a time-domain OFDM symbol; different combinations of a cyclic prefix length and a modulation signal length are selected, so that a finally generated preamble can transmit signaling information through the different combinations; a time-domain OFDM symbol with the cyclic prefix length is intercepted from the time-domain OFDM symbol to be used as a cyclic prefix; a modulation signal is generated based on the intercepted time-domain OFDM symbol with the cyclic prefix length; and the preamble is generated based on the cyclic prefix, the time-domain OFDM symbol, and the modulation signal. Through the method, the problems in the conventional DVB_T2 and other standards that a time-domain structure is not applicable for coherent detection because of the absence of the cyclic prefix and that the preamble has a failure probability for detecting a low-complexity reception algorithm under a complex frequency-selective fading channel are 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L5/00
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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