tailieunhanh - Báo cáo hóa học: " Research Article Iterative Fusion of Distributed Decisions over the Gaussian Multiple-Access Channel Using Concatenated BCH-LDGM Codes"

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 Iterative Fusion of Distributed Decisions over the Gaussian Multiple-Access Channel Using Concatenated BCH-LDGM Codes | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2011 Article ID 825327 12 pages doi 2011 825327 Research Article Iterative Fusion of Distributed Decisions over the Gaussian Multiple-Access Channel Using Concatenated BCH-LDGM Codes Javier Del Ser 1 Diana Manjarres 1 Pedro M. Crespo 2 Sergio Gil-Lopez 1 and Javier Garcia-Frias3 1 TECNALIA-TELECOM P. Tecnologico Ed. 202 48170 Zamudio Spain 2CEIT and TECNUN University of Navarra 20009 Donostia-San Sebastian Spain 3 Department of Electrical and Computer Engineering University of Delaware Newark DE 19716 USA Correspondence should be addressed to Javier Del Ser Received 30 November 2010 Accepted 20 January 2011 Academic Editor Claudio Sacchi Copyright 2011 Javier Del Ser 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. This paper focuses on the data fusion scenario where N nodes sense and transmit the data generated by a source s to a common destination which estimates the original information from s more accurately than in the case of a single sensor. This work joins the upsurge of research interest in this topic by addressing the setup where the sensed information is transmitted over a Gaussian Multiple-Access Channel MAC . We use Low Density Generator Matrix LDGM codes in order to keep the correlation between the transmitted codewords which leads to an improved received Signal-to-Noise Ratio SNR thanks to the constructive signal addition at the receiver front-end. At reception we propose a joint decoder and estimator that exchanges soft information between the N LDGM decoders and a data fusion stage. An error-correcting Bose Ray-Chaudhuri Hocquenghem BCH code is further applied suppress the error floor derived from the ambiguity of the MAC channel when dealing with .