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Method and device for receiving preambles

A leading symbol and receiving method technology, applied in the field of broadcast communication, can solve the problems of easy misjudgment, inaccurate channel estimation, and low robustness, so as to avoid amplifying noise, solve misjudgment problems, and improve system accuracy Effect

Active Publication Date: 2016-10-05
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The problem solved by the present invention is that the method and device for receiving the preamble symbols in the prior art, on the premise that the effective subcarriers are cyclically shifted in the time domain or the frequency offset is modulated in the frequency domain to generate time domain symbols to transmit signaling , after the preliminary interpretation and positioning of the time-domain symbols expected to be received, the signaling is analyzed by direct difference in the frequency domain of the preceding and following symbols, resulting in low robustness under multi-path channels and low SNR; when the channel estimation is not very accurate or Misjudgment is more likely to occur when interference paths occur for various reasons

Method used

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  • Method and device for receiving preambles
  • Method and device for receiving preambles

Examples

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Embodiment 1

[0049] figure 1 It is a schematic flowchart of a method for receiving a preamble symbol in Embodiment 1 of the present invention; figure 2 It is a schematic flow chart of analyzing signaling in the preamble symbol receiving method in Embodiment 1 of the present invention.

[0050] Such as figure 1 As shown, the method for receiving the preamble symbol in this embodiment is applicable when the method for sending the preamble symbol used by the sending end meets the predetermined sending rule, and the method for receiving the preamble symbol includes the following steps:

[0051] Step S1-1: judging whether there is a leading symbol in the processed baseband signal; and

[0052] Step S1-2: Determine the position of the preamble symbol in the physical frame and parse out the signaling information carried by the preamble symbol.

[0053] Among them, such as figure 2 As shown, in step S1-2 of determining the position of the preamble symbol in the physical frame and analyzing t...

Embodiment 2

[0186] Figure 12 It is a schematic flow chart of analyzing signaling in the method for receiving preamble symbols in Embodiment 2 of the present invention, and the flow of analyzing signaling is included in such as figure 1 In the receiving method corresponding to the same preamble symbol as in the first embodiment, the overall overview of the receiving method of the preamble symbol is omitted in the second embodiment, Figure 12 for figure 2 Another implementation of .

[0187] Such as Figure 12 As shown, in step S1-2 of determining the position of the preamble symbol in the physical frame and analyzing the signaling information carried by the preamble symbol, the signaling analysis step includes the following specific steps:

[0188] Step S2-2-1: performing Fourier transform on the main time domain signal of each time domain symbol to extract effective subcarriers;

[0189] Step S2-2-2: Perform predetermined mathematical operations on each effective subcarrier and the...

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Abstract

The invention provides a method and a device for receiving a preamble, which can be applied to when a transmitting end meets a preset transmitting rule. The method is characterized by comprising steps: whether a preamble exists in a baseband signal is judged; the position of the preamble in a physical frame is determined and carried signaling information is analyzed, wherein the step of determination and analysis comprises a substep in which a time domain main body signal for each time domain symbol is subjected to Fourier transform and effective sub carriers are then extracted; each effective sub carrier, a known sub carrier corresponding to each frequency domain known sequence in a known frequency domain signaling set for the time domain symbol and a channel estimation value are subjected to predetermined mathematical operation and then inverse Fourier transform is carried out, and an inverse Fourier result is obtained corresponding to each frequency domain known sequence; and based on an inverse Fourier selection result selected from inverse Fourier results in a first predetermined selection rule for each time domain symbol, the signaling information is analyzed directly and / or by using predetermined processing operation between multiple time domain symbols, the signaling information is analyzed based on the obtained inter-symbol processing result.

Description

technical field [0001] The invention belongs to the field of broadcast communication, and in particular relates to a method for receiving a preamble symbol and a corresponding device. Background technique [0002] 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 sender and the receiver of the OFDM system. The preamble symbol marks the beginning of the physical frame (named P1 symbol), and only one P1 symbol or multiple P1 symbols appear consecutively in each physical frame. Symbols, the uses of P1 symbols include: [0003] 1) Make the receiving end detect quickly to determine whether the signal transmitted in the channel is the desired signal; [0004] 2) Provide basic transmission parameters (such as FFT points, frame type information, etc.), so that the receiving end can perform subsequent receiv...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04J13/0059H04L27/26H04L27/2607H04L27/261H04L27/2613H04L27/2647H04L27/265H04L27/2671H04L27/2672H04L27/2688H04L27/2691H04L27/2692
Inventor 黄戈邢观斌徐洪亮郭序峰张文军管云峰何大治
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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