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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: Research Article Feedforward Data-Aided Phase Noise Estimation from a DCT Basis Expansion | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 568570 11 pages doi 10.1155 2009 568570 Research Article Feedforward Data-Aided Phase Noise Estimation from a DCT Basis Expansion Jabran Bhatti and Marc Moeneclaey Department of Telecommunications and Information Processing Ghent University 9000 Ghent Belgium Correspondence should be addressed to Marc Moeneclaey marc.moeneclaey@telin.ugent.be Received 1 July 2008 Revised 5 November 2008 Accepted 25 December 2008 Recommended by Erchin Serpedin This contribution deals with phase noise estimation from pilot symbols. The phase noise process is approximated by an expansion of discrete cosine transform DCT basis functions containing only a few terms.We propose a feedforward algorithm that estimates the DCT coefficients without requiring detailed knowledge about the phase noise statistics. We demonstrate that the resulting linearized mean-square phase estimation error consists of two contributions a contribution from the additive noise that equals the Cramer-Rao lower bound and a noise independent contribution that results from the phase noise modeling error. We investigate the effect of the symbol sequence length the pilot symbol positions the number of pilot symbols and the number of estimated DCT coefficients on the estimation accuracy and on the corresponding bit error rate BER . We propose a pilot symbol configuration allowing to estimate any number of DCT coefficients not exceeding the number of pilot symbols providing a considerable performance improvement as compared to other pilot symbol configurations. For large block sizes the DCT-based estimation algorithm substantially outperforms algorithms that estimate only the time-average or the linear trend of the carrier phase. Copyright 2009 J. Bhatti and M. Moeneclaey. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and .
