PIC technique with reduced complexity in GPS

Abstract

As demand increases for the Global positioning System (GPS) to provide precise positioning information in harsh environments such as dense urban and indoor areas, searching weak detection signals has become one of the main issues in GPS. Among the issues, the cross correlation effect between satellite signals is one of the problems which degrade signal acquisition performance especially in harsh environments. This problem also occurs when the pseudolite which transmits very strong signal compared to satellite signal exists near the receiver. For this reason, a number of techniques that mitigate the effects of cross correlation have been researched. However, since these techniques have high computational complexity and are time consuming, there are some difficulties in implementing these techniques. In this paper, a new technique based on Parallel Interference Cancellation (PIC) to reduce the computational complexity is proposed and evaluated with conventional PIC technique.