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The world's most popular GNSS system is Global Positioning System (GPS). This was developed by the U.S Department of Defense (DOD) to know the accurate position coordinates of a location. However, GPS also failed to find the position coordinates especially in dense areas and urban canyon. This situation was eliminated by using ground based satellites called as Pseudolites (PLs) which provide GPS like signals where the obstruction of satellites signals from the GPS constellation take place. Thus, by augmenting the GNSS with Pseudolites the continuity, accuracy and availability were improved. Even though the Pseudolites are useful, still the performance of Pseudolite is limited by the"Near-Far Effect". The various techniques used to overcome near-far Effect are spreading PRN codes, frequency offset, frequency hopping, signal pulsing and Successive Interference Cancellation (SIC). The best way to reduce near-far effect is to use signal pulsing.However, when multiple PLs are employed, multiple access interference limits the system performance. In this paper, the analysis of near-far problem using pulsing scheme has be done while taking GPS constellation into account. Also, the performance evaluation of the PL system with Reference based Successive Interference Cancellation (RSIC) receiver, which is the best optimal method of Multiuser detector (MUD) has been presented.

Extenuation of Near-Far Effect using Signal Pulsing Scheme and RSIC to reduce MAI in Pseudolite Applications