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Generation method for preamble symbol in physical frame

A technology of preamble symbols and physical frames, applied in transmitter/receiver shaping network, digital transmission system, electrical components, etc., can solve problems such as inapplicability of coherent detection, no cyclic prefix, failure of receiving algorithm detection, etc., to achieve Good timing synchronization performance, good fractional frequency offset estimation performance, and the effect of solving the performance degradation of frequency domain channel estimation

Active Publication Date: 2015-11-04
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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Problems solved by technology

[0008] 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 symbol in physical frame
  • Generation method for preamble symbol in physical frame
  • Generation method for preamble symbol in physical frame

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Embodiment Construction

[0028] 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.

[0029] 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. Further, it is ensured that the receiving end can still process the received signal within the range of the carrier frequency deviation from -500kHz to 500kHz.

[0030] In order to m...

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Abstract

The invention discloses a generation method for preamble symbols in a physical frame. The generation method comprises the steps of: carrying out inverse discrete Fourier transform on a frequency domain OFDM symbol with a preset length to obtain a time domain OFDM symbol; determining a cyclic prefix length; intercepting a time domain OFDM symbol with the cyclic prefix length from the time domain OFDM symbol to serve as a cyclic prefix; generating a modulation signal based on the intercepted time domain OFDM symbol with the cyclic prefix length; and generating a preamble symbol based on the cyclic prefix, the time domain OFDM symbol and the modulation signal. The technical scheme provided by the invention solves the problems of the current DVB_T2 standard and other standards that a DVB_T2 time domain structure has no cyclic prefix and is not suitable for coherent detection, and the failure probability of the preamble symbol detected by adopting a low complexity receiving algorithm in a complex frequency selectivity fading channel is high.

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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IPC IPC(8): H04L5/00H04L27/26H04L25/03
CPCH04L5/0083H04L27/2602H04L27/2628H04L27/2692
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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