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An acquisition method of pre-detection signal and design method of PN sequence in TDS-OFDM system

A signal and signal frame technology, applied in the field of digital information transmission, can solve problems such as performance loss, achieve the effect of simplifying the capture method, avoiding the IBI effect, and improving the accuracy

Inactive Publication Date: 2011-09-07
维布络网络私人有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as document [2]: "B.Muquet, Z.Wang, G.B.Giannakis, M.de Courville, and P.Duhamel, "Cyclic prefixing or zero multicarriertransmissions," IEEE Trans.Commun., vol.50, no. 12, pp.2136-2148, Dec.2002.", due to the phenomenon of zero spectrum or close to zero spectrum in the transmission sub-channels corresponding to some subcarriers, the CP-OFDM system (OFDM using CP as the guard interval system) may suffer a performance penalty

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  • An acquisition method of pre-detection signal and design method of PN sequence in TDS-OFDM system
  • An acquisition method of pre-detection signal and design method of PN sequence in TDS-OFDM system
  • An acquisition method of pre-detection signal and design method of PN sequence in TDS-OFDM system

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Embodiment Construction

[0018] The following part describes the embodiment of the acquisition method of the pre-detection signal and the design method of the PN sequence in the TDS-OFDM system provided by the present invention in conjunction with the accompanying drawings, in order to further understand the purpose, specific structural features and advantages of the present invention.

[0019] For the convenience of description, unless otherwise specified, the TDS-OFDM system mentioned in the following description refers to the TDS-OFDM system applied in the Chinese national standard of the digital TV terrestrial broadcasting system, but the present invention is not limited to this application scope, and can also be It is easy to extend and apply to other types of TDS-OFDM systems.

[0020] The TDS-OFDM system uses a hierarchical frame structure. figure 1 The physical channel frame structure diagram of downlink transmission protocol in TDS-OFDM system is described. The basic unit of the data frame s...

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Abstract

The invention discloses a method for capturing a pre-detection signal in a TDS-OFDM system and comprises that: the elements of a vector a1n are the last Ln symbols in the frame synchronization of the received n-th signal frame; the elements of a vector a2n are the first Lp symbols in the frame body of the received n-th signal frame; the elements of a vector a0n are the middle (N-Lp - Ln) th symbols starting from the Lp-th symbol of the frame body of the received n-th signal frame; the elements of a vector a3n are the last Ln symbols in the frame body of the received n th signal frame; the elements of a vector a4n are the first Lp symbols in the frame synchronization of the received (n+1) th signal frame; the elements of a vector e13n are the symbols with orders from (Q0 - Ln)th to (Q0 - one)th in the frame synchronization of the (n-1)th signal frame; the elements of a vector e24n are the symbols with order from Q0 th to (Q0 + Lp -1)th in the frame synchronization of the (n+1)th signal frame; the first Lp elements of gNn are acquired by the vector a2n + a4n - e24n; and the next (N-Lp - Ln)th elements of gNn are acquired by copying from Alpha0n; the last Ln elements of gNn are acquired by the vector a1n + a3n - e13n.

Description

technical field [0001] The present invention relates to digital information transmission technology, in particular to a method for capturing signals before detection and a method for designing PN sequences in a terrestrial digital multimedia / television broadcasting system based on time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) technology . Background technique [0002] Orthogonal frequency division multiplexing (OFDM) technology is widely used in signal transmission in wireless channels, and is adopted by a number of wireless transmission standards, such as digital audio broadcasting (digital audio broadcasting, DAB) and terrestrial digital video broadcasting ( digital video broadcast-terrestrial, DVB-T), see literature [1]: "Digital video broadcasting (DVB); framing structure, channel coding and modulation for digital terrestrial television, ETSI EN 300 744 V 1.5.1 (2004-11) , European Telecommunications Standards Institute.” OFDM converts t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 王忠俊李之平胡赛桂庭裕晶冨沢方之
Owner 维布络网络私人有限公司