THE CO-EXISTENCE OF SPREAD SPECTRUM RANGING SIGNAL IN INDIAN NATIONAL SATELLITE-1B (INSAT-IB) WITH TV OR SCPC CHANNELS

Abstract

Spread Spectrum Systems have the potential of sharing the frequency spectrum with broadcasting, telephony and data communications services due to their low power density signalling. The study of feasibility of co-existence of Direct Sequence Spread Spectrum ranging signal with TV or SCPC carriers in a common satellite transponder is presented in this paper. The suitability of this type of ranging for Indian National Satellite-IB (INSAT-IB) system from Master Control Facility (MCF), Hassan, India has been examined. The mutual interference effects between spread spectrum ranging signal and TV or SCPC services through various sizes of earth stations in INSAT network have been calculated. The study indicates that simultaneous accurate range measurement by spread spectrum technique from control earth station is possible without any significant degradation in signal quality of TV or SCPC services.