Báo cáo hóa học: " Research Article Joint Symbol Timing and CFO Estimation for OFDM/OQAM Systems in Multipath Channels"

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: Research Article Joint Symbol Timing and CFO Estimation for OFDM/OQAM Systems in Multipath Channels | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 897607 11 pages doi 2010 897607 Research Article Joint Symbol Timing and CFO Estimation for OFDM OQAM Systems in Multipath Channels Tilde Fusco EURASIP Member 1 Angelo Petrella 2 and Mario Tanda3 1 Communications Regulatory Authority Department for Studies Research and Education Centro Direzionale Isola B5 80143 Napoli Italy 2 Selex Sistemi Integrati Via Giulio Cesare 268 Bacoli 80070 Napoli Italy 3 Dipartimento di Ingegneria Biomedica Elettronica e delle Telecomunicazioni Universita di Napoli Federico II Via Claudio 21 80125 Napoli Italy Correspondence should be addressed to Mario Tanda Received 27 May 2009 Revised 27 September 2009 Accepted 13 November 2009 Academic Editor Faouzi Bader Copyright 2010 Tilde Fusco et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. The problem of data-aided synchronization for orthogonal frequency division multiplexing OFDM systems based on offset quadrature amplitude modulation OQAM in multipath channels is considered. In particular the joint maximum-likelihood ML estimator for carrier-frequency offset CFO amplitudes phases and delays exploiting a short known preamble is derived. The ML estimators for phases and amplitudes are in closed form. Moreover under the assumption that the CFO is sufficiently small a closed form approximate ML AML CFO estimator is obtained. By exploiting the obtained closed form solutions a cost function whose peaks provide an estimate of the delays is derived. In particular the symbol timing . the delay of the first multipath component is obtained by considering the smallest estimated delay. The performance of the proposed joint AML estimator is assessed via computer simulations and compared with that achieved

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