Title :
A new bit synchronization method for a GPS receiver
Author :
Kokkonen, Mikko ; Pietilä, Samuli
Author_Institution :
Nokia Group, Nokia Res. Center, Espoo, Finland
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;
Conference_Titel :
Position Location and Navigation Symposium, 2002 IEEE
Print_ISBN :
0-7803-7251-4
DOI :
10.1109/PLANS.2002.998893
