Symbol timing error detector that uses a channel profile of a digital receiver and a method of detecting a symbol timing error

Abstract

A symbol timing error detector for a digital receiver and a method for detecting symbol timing errors using channel characteristics. The symbol timing error detector includes: a non-coherent correlator to calculate non-coherent correlation values ​​using a pseudo-noise (PN) sequence in which a received signal is divided into a predetermined number of units to calculate channel characteristics; a block buffer to calculate channel characteristics A predetermined portion of the window is windowed and stored; a characteristic comparison unit uses pattern matching to compare the channel characteristics stored in the block buffer with the current channel characteristics output from the non-coherent correlator; and a symbol timing estimator detects the channel characteristics using the current The difference in symbol index determined by pattern matching of the channel characteristic and the stored channel characteristic is taken as the symbol timing drift. Therefore, the timing error can be corrected regardless of the carrier frequency offset caused by the influence of the channel environment.

Description

technical field [0001] The present general inventive concept relates to a symbol timing detector for a digital receiver, and more particularly, to a symbol timing using channel profile to recover symbol timing regardless of carrier frequency offset An error detector and a method of detecting symbol timing errors. Background technique [0002] In general, a digital communication system can recover a received signal only when the sampling timing at the receiving end exactly matches that at the transmitting end. Typically, symbol timing recovery means are applied at the receiving end. [0003] figure 1 Represents a timing recovery arrangement for a vestigial sideband (VSB) type digital receiver. The signal received through the antenna is converted into a baseband signal through the down converter 10 . Then, the down-converted baseband signal is converted into a digital signal by the A / D converter 20 . The downconverter 10 is interchangeable with th...

AI Technical Summary

Problems solved by technology

This is caused by the fact that when using the sooner or later timing error detection algorithm, the timing error is extracted by using the signal waveform, when there is a carrier frequency error and a phase error in the signal to be extracted, the timing error can be caused by Distortion of the signal waveform without being accurately detected

As a result, in the presence of carrier frequency errors or phase errors, even when timing errors are extracted based on known signals, timing errors may still not be accurately detected

Images