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Symbol timing synchronizing method and apparatus using the same method

A technology of timing synchronization and code elements, applied in the direction of multi-frequency code systems, etc., can solve the problems of difficult selection of time-dispersed channels, different amplitude ranges of sampling points, etc., and achieve the effect of high-reliability symbol timing detection

Inactive Publication Date: 2011-06-08
SUNPLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, different types of time-dispersed channels will lead to different amplitude ranges of sampling points in the cross-correlation sequence, so it is difficult to choose an appropriate critical value to meet all types of time-dispersed channels

Method used

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  • Symbol timing synchronizing method and apparatus using the same method
  • Symbol timing synchronizing method and apparatus using the same method
  • Symbol timing synchronizing method and apparatus using the same method

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Embodiment Construction

[0058] For the convenience of description of the embodiment, the communication system below takes an Orthogonal Frequency Division Multiplexing (OFDM) system using a guard interval to detect symbol timing as an example. The receiver of the OFDM system generates the sampling sequence r[n] after the received OFDM signal undergoes analog-to-digital conversion. At this time, the starting position of each symbol in the sampling sequence r[n] must be detected to correctly reply This operation is called symbol timing synchronization for the information transmitted from the transmitter.

[0059] Figure 3A It is a flowchart of a symbol timing synchronization method according to an embodiment of the present invention, and Figure 4A for with Figure 3A Schematic diagram of the signals associated with the symbol timing synchronization method shown. Please also refer to Figure 3A and Figure 4A , in step S311, first calculate the correlation between the sampling sequence r[n] and i...

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Abstract

A method for synchronizing code element timing includes calculating correlation of sampling sequence and delay sampling sequence of sampling sequence delay length N for generating correlation sequence, generating cross correlation sequence by taking a moving average on correlation sequence, carrying out differential operation on cross correlation sequence to generate differential post sequence, generating a moving average post sequence by taking a moving average on differential sequence, detecting peak value position of moving average post sequence for obtaining correct code element timing.

Description

technical field [0001] The present invention relates to a symbol timing synchronization (symbol timing synchronization), and in particular to a method and device for symbol timing synchronization of a receiver in an orthogonal frequency division multiplexing (OFDM) system . Background technique [0002] In an OFDM communication system, the receiver must detect the starting position of each symbol to correctly reply to the information transmitted from the transmitter. This operation is called symbol timing synchronization. For some OFDM systems, such as wireless local area network (WLAN) or digital audio broadcasting (DAB) system, the transmitter will transmit some preamble or training sequence for the receiver to use as symbol Timed synchronization. However, for some other OFDM systems, such as terrestrial video broadcasting (DVB-T) systems, the transmitter does not transmit these preamble data or training sequences. These systems typically exploit the guard interval prop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 王志耀冯治军
Owner SUNPLUS TECH CO LTD