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 On Channel Estimation for Analog Network Coding in a Frequency-Selective Fading Channel | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2011 Article ID 980430 12 pages doi 2011 980430 Research Article On Channel Estimation for Analog Network Coding in a Frequency-Selective Fading Channel Haris Gacanin 1 Tomas Sjodin 2 and Fumiyuki Adachi3 1 Motive Division Alcatel-Lucent Bell NV 2018 Antwerp Belgium 2 Department of Computing Science Umea University 901 87 Umea Sweden 3 Department of Electrical and Communication Engineering Tohoku University Sendai 980-8579 Japan Correspondence should be addressed to Haris Gacanin harisg@ Received 4 August 2010 Revised 7 November 2010 Accepted 11 January 2011 Academic Editor Ashish Pandharipande Copyright 2011 Haris Gacanin 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. Recently broadband analog network coding ANC was introduced for high-speed transmission over the wireless frequency-selective fading channel. However ANC requires the knowledge of channel state information CSI for self-information removal and coherent signal detection. In ANC the users pilot signals interfere during the first slot which renders the relay unable to estimate CSIs of different users and consequently four time-slot pilot-assisted channel estimation CE is required to avoid interference. Naturally this will reduce the capacity of ANC scheme. In this paper we theoretically analyze the bit error rate BER performance of bi-directional broadband ANC communication based on orthogonal frequency division multiplexing OFDM radio access. We also theoretically analyze the performance of the channel estimator s mean square error MSE . The analysis is based on the assumption of perfect timing and frequency synchronization. The achievable BER performance and the estimator s MSE for broadband ANC is evaluated by numerical and
