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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: Frequency-Shift Zero-Forcing Time-Varying Equalization for Doubly Selective SIMO Channels | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 47261 Pages 1-14 DOI 10.1155 ASP 2006 47261 Frequency-Shift Zero-Forcing Time-Varying Equalization for Doubly Selective SIMO Channels Francesco Verde Dipartimento di Ingegneria Elettronica e delle Telecomunicazioni Universita degli Studi di Napoli Federico II via Claudio 21 80125 Napoli Italy Received 1 June 2005 Revised 26 February 2006 Accepted 30 April 2006 This paper deals with the problem of designing linear time-varying LTV finite-impulse response zero-forcing ZF equalizers for time- and frequency-selective so-called doubly selective single-input multiple-output SIMO channels. Specifically relying on a basis expansion model BEM of the rapidly time-varying channel impulse response we derive the canonical frequency-domain representation of the minimal norm LTV-ZF equalizer which allows one to implement it as a parallel bank of linear time-invariant filters having as input signals different frequency-shift FRESH versions of the received data. Moreover on the basis of this FRESH representation we propose a simple and effective low-complexity version of the minimal norm LTV-ZF equalizer and we discuss the relationships between the devised FRESH equalizers and a LTV-ZF equalizer recently proposed in the literature. The performance analysis carried out by means of computer simulations shows that the proposed FRESH-LTV-ZF equalizers significantly outperform their competitive alternative. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION In many wireless applications such as high-speed Internet access networking digital audio and video broadcasting the increasing need to provide either high data-rate services for low-mobility users or low data-rate services for high-mobility users has made Doppler spreading and intersymbol interference the main performance limiting factors. The design of low-complexity reliable detection strategies for .