Symbol timing synchronizing method and apparatus using the same method

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

Symbol timing synchronization method and device using the same technical field The present invention relates to a symbol timing synchronization (symbol timing synchronization), and more particularly, to a method and device for symbol timing synchronization of a receiver in an orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) system. Background technique In an OFDM communication system, the receiver must detect the starting position of each symbol (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) systems, the transmitter will transmit some preamble or training sequence for the receiver to use for symbol timing Synchronize. However, for some other OFDM systems, such as terrestrial video broadcasting (DVB-T) systems, the transmitter does not tran...

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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

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