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Abstract:
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DS-CDMA made its step from military to civil use because of its interesting properties with multi-path fading channels and it is finding a lot of applications in today's and future systems, ranging from satellite communications to the third generation (3G) mobile communication systems (UMTS).- As a spread spectrum technique, CDMA provides an inherent narrowband interference immunity up to certain signal to interference ratios. Nevertheless, when the interference power increases, the system is affected and the performance worsens, making it necessary to include some additional means of eliminating the narrowband interference.- In this thesis, a filter bank based interference detection and suppression method is developed and its performance studied. The developed baseband model of the system allows simulations under different interference conditions. Under these conditions, diverse algorithms are applied to minimize the system's bit error rate. The simulation results based on several detection and suppression methods are presented in the following pages, showing that good performance can be obtained even in the presence of strong interference. /Kir10 |