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 Orthogonal DF Cooperative Relay Networks with Multiple-SNR Thresholds and Multiple Hard-Decision Detections | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 169597 11 pages doi 2010 169597 Research Article Orthogonal DF Cooperative Relay Networks with Multiple-SNR Thresholds and Multiple Hard-Decision Detections Dian-Wu Yue1 2 and Ha H. Nguyen3 1 College of Information Science Technology Dalian Maritime University Dalian Liaoning 116026 China 2National Mobile Communications Research Laboratory Southeast University Nanjing Jiangsue 210096 China 3 Department of Electrical Computer Engineering University of Saskatchewan Saskatoon SK Canada S7N 5A9 Correspondence should be addressed to Ha H. Nguyen Received 17 October 2009 Revised 28 March 2010 Accepted 17 June 2010 Academic Editor Mischa Dohler Copyright 2010 . Yue and H. H. Nguyen. 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. This paper investigates a wireless cooperative relay network with multiple relays communicating with the destination over orthogonal channels. Proposed is a cooperative transmission scheme that employs two signal-to-noise ratio SNR thresholds and multiple hard-decision detections HDD at the destination. One SNR threshold is used to select transmitting relays and the other threshold is used at the destination for detection. Then the destination simply combines all the hard-decision results and makes the final binary decision based on majority voting. Focusing on the decode-and-forward DF relaying protocol the average bit error probability is derived and diversity analysis is carried out. It is shown that the full diversity order can be achieved by setting appropriate thresholds even when the destination does not know the exact or average SNRs of the source-relay links. The performance analysis is further extended to multi-hop cooperation and or .
