Physical frame preamble symbol receiving and processing method

A technology of preamble symbols and processing methods, applied in digital transmission systems, electrical components, modulated carrier systems, etc., can solve problems such as failure probability

Active Publication Date: 2016-01-13
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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  • Abstract
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Problems solved by technology

[0009] The problem solved by the present invention is the problem of the failure probability of the preamble symbol in the low-compl...

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  • Physical frame preamble symbol receiving and processing method
  • Physical frame preamble symbol receiving and processing method
  • Physical frame preamble symbol receiving and processing method

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Embodiment Construction

[0018] The inventors 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 complex frequency selective fading channels.

[0019] In view of the above problems, the inventor provides a method for receiving and processing preamble symbols in a physical frame after research. This method is based on the characteristics of the time-domain waveform of the preamble symbol, using the modulated signal of the time-domain OFDM symbol and the structure of the time-domain OFDM symbol to ensure that the peak value can be obtained by using delay correlation at the receiving end. Moreover, the modulated signal of the OFDM symbol in the time domain can avoid continuous wave interference or single-frequency interference at the receiving end, or a multipath channel with the same length as the modulated signal, or when the length of the guard interval in the received signal...

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Abstract

A physical frame preamble symbol receiving and processing method comprises the steps as follows: processing a received digital signal to obtain a baseband signal; judging whether there is a preamble symbol expecting to receive in the baseband signal, wherein the preamble symbol expecting to receive is a time-domain structure with a time-domain OFDM symbol as the main body and with a cyclic prefix in the front part and a modulation signal in the back part; and determining the position of the preamble symbol in a physical frame and parsing out signaling information carried in the preamble signal if there is a preamble symbol expecting to receive in the baseband signal. According to the technical scheme, the problem that a preamble symbol may fail to be detected by a low-complexity receiving algorithm under a complex frequency-selective fading channel under the condition of the current DVB_T2 standard or other standards is solved.

Description

technical field [0001] The invention relates to the technical field of wireless broadcast communication, in particular to a method for receiving and processing 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 tra...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2607H04L27/2692
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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