TAILIEUCHUNG - Báo cáo hóa học: "Research Article Comparison of Channel Estimation Protocols for Coherent AF Relaying Networks in the Presence of Additive Noise and LO Phase Noise Stefan Berger and Armin Wittneben"

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 Comparison of Channel Estimation Protocols for Coherent AF Relaying Networks in the Presence of Additive Noise and LO Phase Noise Stefan Berger and Armin Wittneben | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 861735 12 pages doi 2010 861735 Research Article Comparison of Channel Estimation Protocols for Coherent AF Relaying Networks in the Presence of Additive Noise and LO Phase Noise Stefan Berger and Armin Wittneben ETH Zurich 8092 Zurich Switzerland Correspondence should be addressed to Stefan Berger berger@ Received 9 February 2010 Revised 12 May 2010 Accepted 3 June 2010 Academic Editor Mischa Dohler Copyright 2010 S. Berger and A. Wittneben. 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. Channel estimation protocols for wireless two-hop networks with amplify-and-forward AF relays are compared. We consider multiuser relaying networks where the gain factors are chosen such that the signals from all relays add up coherently at the destinations. While the destinations require channel knowledge in order to decode our focus lies on the channel estimates that are used to calculate the relay gains. Since knowledge of the compound two-hop channels is generally not sufficient to do this the protocols considered here measure all single-hop coefficients in the network. We start from the observation that the direction in which the channels are measured determines 1 the number of channel uses required to estimate all coefficient and 2 the need for global carrier phase reference. Four protocols are identified that differ in the direction in which the first-hop and the second-hop channels are measured. We derive a sensible measure for the accuracy of the channel estimates in the presence of additive noise and phase noise and compare the protocols based on this measure. Finally we provide a quantitative performance comparison for a simple single-user application example. It is important

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