Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Performance Evaluation of a Novel CDMA Detection Technique: The Two-State Approach | EURASIP Journal on Applied Signal Processing 2005 5 658-669 2005 Hindawi Publishing Corporation Performance Evaluation of a Novel CDMA Detection Technique The Two-State Approach Enrico Del Re Department of Electronics and Telecommunications DET University of Florence Via di Santa Marta 3 50139 Florence Italy Email delre@ Lorenzo Mucchi Department of Electronics and Telecommunications DET University of Florence Via di Santa Marta 3 50139 Florence Italy Email lorenzo@ Luca Simone Ronga CNIT Florence Unit University of Florence Via di Santa Marta 3 50139 Florence Italy Email Received 1 August 2003 Revised 4 March 2004 The use of code division multiple access CDMA makes third-generation wireless systems interference limited rather than noise limited. The research for new methods to reduce interference and increase efficiency led us to formulate a signaling method where fast impulsive silence states are mapped on zero-energy symbols. The theoretical formulation of the optimum receiver is reported and the asymptotic multiuser efficiency AME as well as an upper bound of the probability of error have been derived and applied to the conventional receiver and the decorrelating detector. Moreover computer simulations have been performed to show the advantages of the proposed two-state scheme over the traditional single-state receiver in a multiuser CDMA system operating in a multipath fading channel. Keywords and phrases code division multiple access communication signal theory wireless communications impulsive information sources. 1. INTRODUCTION Bandwidth represents the last challenge in wireless personal communications. Due to the average increase of the radiolink bandwidth requirements and the hostile urban radio channel for the interference-limited CDMA the system capacity will meet its physical limitations even in a moderated deployment scenario. Moreover the grown of the short-range wireless communication world IEEE
