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Preamble symbol receiving device

A technology of a preamble symbol and a receiving device, applied in the field of broadcast communication, can solve the problems of inaccurate channel estimation, prone to misjudgment, low robustness, etc., so as to avoid amplifying noise, solve the problem of misjudgment, and improve the accuracy of the system Effect

Active Publication Date: 2017-05-10
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

[0009] The problem solved by the present invention is that the method and device for receiving the preamble symbols in the prior art, under the premise that the effective subcarriers are cyclically shifted in the time domain or 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 signal-to-noise ratios; 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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Embodiment 1

[0050] 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.

[0051] 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:

[0052] Step S1-1: judging whether there is a leading symbol in the processed baseband signal; and

[0053] 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.

[0054] 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

[0177] 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 of the leading symbol corresponding to the first embodiment, the overall overview of the receiving method of the leading symbol is omitted in the second embodiment, Figure 12 for figure 2 Another implementation of .

[0178] 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:

[0179] Step S2-2-1: performing Fourier transform on the main time domain signal of each time domain symbol to extract effective subcarriers;

[0180] Step S2-2-2: Perform predetermined mathematical operations on each effective subcarrier and the known sub...

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Abstract

The invention provides a preamble symbol receiving device which is applicable to the situation that a sending device satisfies a preset sending rule. The device comprises a processing judging part which judges whether a preamble symbol exists in a baseband signal obtained through processing or not; and a positioning resolution part which determines a position of the preamble symbol in a physical frame and resolves signal information carried in the preamble symbol. The positioning resolution part comprises an expansion unit which expands a known frequency domain signal set of each time domain symbol to a known frequency domain signal expansion set; a carrier extraction unit which carries out Fourier transform on the time domain body signal of each time domain symbol and then extracts an effective subcarrier; an operation processing unit which carries out preset arithmetical operation on each effective subcarrier, a known subcarrier and a channel estimation value to obtain operation values and then accumulates the operation values; and a selection resolution unit which selects an accumulation value according to a second preset selection rule and calculates to obtain a frequency domain modulation frequency shift value, namely a time domain cyclic shift transmitted signal, through utilization of the frequency domain known sequence of the known frequency domain signal expansion set corresponding to the accumulation value.

Description

[0001] This application is a divisional application of the original application, the application number of the original application is 201510076155.8, the application date is February 12, 2015, and the invention name is "receiving method and device for leading symbols". technical field [0002] The invention belongs to the field of broadcast communication, and in particular relates to a receiving device of a preamble symbol. Background technique [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 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: [0004] 1) Make the receiving end detect qui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04J13/00
CPCH04J13/0059H04L27/26H04L27/2607H04L27/261H04L27/2613H04L27/2647H04L27/265H04L27/2671H04L27/2672H04L27/2688H04L27/2691H04L27/2692
Inventor 张文军黄戈邢观斌何大治
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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