Study on Canceling Intersymbol Interference of Inverse-GPS

Abstract

In inverse-GPS (Global Positioning System), the intersymbol interference greatly influences on the positioning error. This paper deals with new interference canceller that reduces the error. Our proposed interference canceller consists of DLL (Delay Locked Loop) and adaptive filter. Only a primary phase of replica signal is estimated in DLL. Afterwards, the strict wave is generated with the adaptive filter. We could decrease the intersymbol interference error caused from the user increase, using interference canceller that combined DLL with the adaptive filter.