Improved Gardner Suppression Timing Jitter Synchronization Algorithm

Huang Zhen,Zhang Wei Han,Yang Pan

doi:10.11648/j.jeee.20200801.14

Abstract

In non-cooperative digital communication systems, the symbol synchronization of the received signal is of great significance for the correct demodulation of the signal. Synchronization, as a key factor in the accurate transmission of information at the sender in communication, is also a vital technology in blind demodulation structures. Strictly speaking, the synchronization technology in non-cooperative communication systems includes not only carrier synchronization and bit synchronization, but also group synchronization and network synchronization. Although the existing synchronization algorithms have good reference value, they also have their limitations. For the traditional symbol synchronization loop based on the Gardner algorithm, when the roll-off coefficient is small and the symbol rate is high, the loop self-noise is serious. This paper uses a symbol synchronization method based on interpolation adjustment sequences, and proposes an improved algorithm that sets a pre-filter that meets the condition of zero timing jitter before the traditional timing error detector to compensate for the effect of self-noise on synchronization. The simulation results of the two algorithms are compared and analyzed. Through the comparison and analysis of the simulation results of the two algorithms, it is found that the improved algorithm can effectively suppress the timing jitter caused by the self-noise of the loop, and at the same time, can accelerate the symbol synchronization speed, effectively improve the limitations of the traditional algorithm and the slow convergence speed. Engineering significance.

Highlights

Synchronization, as a key factor for accurate transmission of information at the sender side in communication, is a vital technology in blind demodulation structures
[1] the existing synchronization algorithms have good reference values, they have their limitations Gardner algorithm based on interpolation to achieve bit synchronization is only applicable to PSK signals; Schmid algorithm can only play its timing synchronization role only in OFDM systems. [2,3,4] the appropriate timing synchronization technology is selected under different modulation modes and channel conditions
This paper uses the second method of symbol synchronization based on interpolation adjustment sequences, and proposes an improved algorithm that sets a pre-filter that meets the condition of zero timing jitter before the traditional timing error detector, and performs simulation results of the two algorithms

Summary

Introduction

Synchronization, as a key factor for accurate transmission of information at the sender side in communication, is a vital technology in blind demodulation structures. [1] the existing synchronization algorithms have good reference values, they have their limitations Gardner algorithm based on interpolation to achieve bit synchronization is only applicable to PSK signals; Schmid algorithm can only play its timing synchronization role only in OFDM systems. There are two main methods to achieve symbol synchronization: the first is to blindly estimate the signal phase parameters and construct a timing synchronization algorithm [6,7,8,9,10]; the other is to perform interpolation processing on the input signal and adjust Input sequence. This paper uses the second method of symbol synchronization based on interpolation adjustment sequences, and proposes an improved algorithm that sets a pre-filter that meets the condition of zero timing jitter before the traditional timing error detector, and performs simulation results of the two algorithms. Huang Zhen et al.: Improved Gardner Suppression Timing Jitter Synchronization Algorithm

Gardner Algorithm Realizes the Principle of Symbol Synchronization

Improved Gardner Synchronization Algorithm for Timing Jitter Suppression

Simulation Analysis

Conclusion