Pulse Shaping Considerations in DS-CDMA Systems with Long Spreading Sequences

In this work, we analyze the effect of different pulse shaping filters on the performance of the asynchronous DS-CDMA systems employing long spreading sequences over Rayleigh-fading channels. We numerically evaluated and compared the performance of rectangular pulse and square root raised cosine pulses with different rolloff factors for conventional receiver and multiuser detectors. Our work justifies the use of rectangular pulse when evaluating the receiver algorithms with computer simulations. Based on the simulation results, we also made some recommendations on how to choose RRC pulses in practical systems, e.g., the selection of rolloff factor, truncation length, etc..

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