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Generating method of preamble symbol 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, no cyclic prefix, coherent detection cannot be applied, etc., and achieve frequency domain channel estimation Effect of performance degradation, good fractional frequency offset estimation performance, good timing synchronization performance

Active Publication Date: 2016-02-10
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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Problems solved by technology

[0009] 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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  • Generating method of preamble symbol in physical frame

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Embodiment Construction

[0033] 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.

[0034] 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.

[0035] 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 generating method of a preamble symbol in a physical frame, comprising the following steps: carrying out discrete Fourier inverse transform on a frequency-domain OFDM symbol of a predetermined length to obtain a time-domain OFDM symbol; intercepting a time-domain OFDM symbol of the cyclic prefix length from the time-domain OFDM symbol as a cyclic prefix; generating a modulation signal based on the intercepted time-domain OFDM symbol of the cyclic prefix length; and generating a preamble symbol based on the cyclic prefix, the time-domain OFDM symbol and the modulation signal. By adopting the technical scheme, the problem in the current DVB_T2 standard and other standards that a DVB_T2 time-domain structure has no cyclic prefix and is not applicable to coherent detection and detection of a preamble symbol by using a low-complexity receiving algorithm under a complex frequency-selective fading channel may fail 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 leading symbol in a physical frame. 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 symbol is a symbol sequence known to both the transmitting end ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00
CPCH04J13/0059H04L27/26
Inventor 张文军黄戈邢观斌徐洪亮何大治管云峰
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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