Receiving and processing method of frequency domain OFDM (Orthogonal Frequency Division Multiplexing) symbol

A processing method and symbol technology, applied in the field of receiving and processing frequency domain OFDM symbols, can solve problems such as failure probability

Active Publication Date: 2016-01-20
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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-complexi

Method used

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  • Receiving and processing method of frequency domain OFDM (Orthogonal Frequency Division Multiplexing) symbol
  • Receiving and processing method of frequency domain OFDM (Orthogonal Frequency Division Multiplexing) symbol
  • Receiving and processing method of frequency domain OFDM (Orthogonal Frequency Division Multiplexing) symbol

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Embodiment Construction

[0018] The inventor found that in the current DVB_T2 standard and other standards, the low-complexity reception algorithm of the preamble symbol in the complex frequency-selective fading channel fails to detect the problem.

[0019] In response to the above problems, the inventor provided a method for receiving and processing frequency-domain OFDM symbols through research. For a specific frequency-domain OFDM symbol structure, when the received baseband signal contains the desired preamble symbol, The signal containing the signaling sequence subcarrier is calculated with the signaling sequence subcarrier set or the time domain signal corresponding to the signaling sequence subcarrier set to solve the signaling carried by the signaling subcarrier in the frequency domain OFDM symbol information.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention ...

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Abstract

The invention discloses a receiving and processing method of a frequency domain OFDM (Orthogonal Frequency Division Multiplexing) symbol. The frequency domain OFDM symbol comprises effective sub-carriers and zero-sequence subcarriers, wherein the zero-sequence subcarriers are located at the two sides of each effective subcarrier; and each effective subcarrier comprises a fixed-sequence subcarrier and a signaling-sequence subcarrier, and the fixed-sequence subcarriers and the signaling-sequence subcarriers are in odd-even staggered arrangement. The receiving and processing method comprises the following steps of when a precursor symbol which is expected to be received exists in a received baseband signal, computing through a signal containing the signaling-sequence subcarriers and a signaling-sequence subcarrier set or a time domain signal corresponding to the signaling-sequence subcarrier set so as to work out signaling information carried by the signaling-sequence subcarriers in the frequency domain OFDM symbol. According to the technical scheme, the problem of detection failure probability of the precursor symbol in a complex frequency selective fading channel by using a low-complexity receiving algorithm in the current DVB-T2 standard and other standards.

Description

Technical field [0001] The present invention relates to the technical field of wireless broadcast communication, in particular to a method for receiving and processing frequency domain OFDM symbols. Background technique [0002] Generally, in order for the receiving end of the OFDM system to correctly demodulate the data sent by the transmitting end, the OFDM system must achieve accurate and reliable time synchronization between the transmitting end and the receiving end. At the same time, because the OFDM system is very sensitive to the carrier frequency offset, the receiving end of the OFDM system also needs to provide an accurate and efficient carrier frequency spectrum estimation method to accurately estimate and correct the carrier frequency offset. [0003] At present, the method of realizing time synchronization between the transmitting end and the receiving end in the OFDM system is basically based on the preamble symbol. The preamble symbol is a sequence of symbols known ...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2601H04L27/2602H04L27/261
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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