tailieunhanh - Báo cáo hóa học: " Filter-Bank-Based Narrowband Interference Detection and Suppression in Spread Spectrum Systems"

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: Filter-Bank-Based Narrowband Interference Detection and Suppression in Spread Spectrum Systems | EURASIP Journal on Applied Signal Processing 2004 8 1163-1176 2004 Hindawi Publishing Corporation Filter-Bank-Based Narrowband Interference Detection and Suppression in Spread Spectrum Systems Tobias Hidalgo Stitz Institute of Communications Engineering Tampere University of Technology . Box 553 33101 Tampere Finland Email Markku Renfors Institute of Communications Engineering Tampere University of Technology . Box 553 33101 Tampere Finland Email Received 29 October 2002 Revised 27 October 2003 Recommended for Publication by Xiang-Gen Xia A filter-bank-based narrowband interference detection and suppression method is developed and its performance is studied in a spread spectrum system. The use of an efficient complex critically decimated perfect reconstruction filter bank with a highly selective subband filter prototype in combination with a newly developed excision algorithm offers a solution with efficient implementation and performance close to the theoretical limit derived as a function of the filter bank stopband attenuation. Also methods to cope with the transient effects in case of frequency hopping interference are developed and the resulting performance shows only minor degradation in comparison to the stationary case. Keywords and phrases narrowband interference cancellation complex PR filter banks DS-SS. 1. INTRODUCTION Direct sequence spread spectrum DS-SS systems have several applications for example CDMA communications and advantages low power spectral density privacy of the communications and an inherent immunity to narrowband interferences due to the processing gain 1 . Nevertheless this immunity is only effective up to certain interference power making it necessary to apply additional techniques to suppress the effect of strong narrowband interferences if a degradation of the performance is to be avoided. Several interference suppression techniques have been proposed to process the signal in the .

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