A new bit synchronization method for a GPS receiver

Author

Kokkonen, Mikko ; Pietilä, Samuli

Author_Institution

Nokia Group, Nokia Res. Center, Espoo, Finland

fYear

2002

fDate

2002

Firstpage

85

Lastpage

90

Abstract

We develop a maximum-likelihood bit synchronization algorithm. This algorithm computes an estimate of the bit energy for all possible bit boundary candidates and chooses that candidate which maximizes the energy. Means to estimate whether the received signal contains enough bit value changes are also presented. The effect of frequency error is analyzed. It is shown that small frequency errors can be tolerated. Furthermore, a way to deal with larger errors is developed. Computer simulations show that the new algorithm is efficient in handling a very weak received signal.

Keywords

Global Positioning System; error analysis; maximum likelihood estimation; radio receivers; synchronisation; GPS receiver; bit boundary candidates; bit energy estimation; bit synchronization method; computer simulations; frequency error tolerance; maximum-likelihood bit synchronization algorithm; received signal bit value changes; weak received signal handling; Computer errors; Correlators; Frequency synchronization; Global Positioning System; Histograms; Maximum likelihood detection; Maximum likelihood estimation; Signal processing; Signal processing algorithms; Tracking loops;

fLanguage

English

Publisher

ieee

Conference_Titel

Position Location and Navigation Symposium, 2002 IEEE

Print_ISBN

0-7803-7251-4

Type

conf

DOI

10.1109/PLANS.2002.998893

Filename

998893