tailieunhanh - Báo cáo hóa học: " Research Article Channel Estimation for Two-Way Relay OFDM Networks"

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 Channel Estimation for Two-Way Relay OFDM Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 186182 6 pages doi 2010 186182 Research Article Channel Estimation for Two-Way Relay OFDM Networks Weiwei Yang 1 2 Yueming Cai 1 2 Junquan Hu 1 and Wendong Yang1 1 Institute of Communications Engineering PLA University of Science and Technology Nanjing 210007 China 2National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China Correspondence should be addressed to Weiwei Yang yww_1010@ Received 31 December 2009 Revised 18 May 2010 Accepted 8 July 2010 Academic Editor Xiaodai Dong Copyright 2010 Weiwei Yang 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. We consider the channel estimation for two-way relay OFDM networks. We proposed an LS-based channel estimation algorithm under block-based training schemes. Based on the mean square error MSE criterion the condition and the design method for optimal training sequences are discussed. To reduce peak-to-average power ratio PAPR a special sequence called Zadoff-Chu sequence is employed to design the optimal training sequence which can achieve both minimum MSE performance and excellent PAPR performance. 1. Introduction Two-way communication is a popular type of modern communications where two source terminals simultaneously communicate. The two-way channel was first considered by Shannon who derived inner and outer bounds on the capacity region 1 . Recently the two-way relay networks TWRNs have attracted a great deal of research interest 213 due to its potential application in cellular networks and peer-to-peer networks. Both amplify-and-forward AF and decode-and-forward DF protocols developed for one-way relay channels are extended to the half-duplex additive white Gaussian noise AWGN two-way