Type of Document	Master's Thesis
Author	Wang, Dimeng
Author's Email Address	dwang3@lsu.edu
URN	etd-07082007-222626
Title	Sigma-Delta Modulation Based Distributed Detection in Wireless Sensor Networks
Degree	Master of Science in Electrical Engineering (M.S.E.E.)
Department	Electrical & Computer Engineering
Advisory Committee	Advisor Name Title Shuangqing Wei Committee Chair Guoxiang Gu Committee Co-Chair Ashok Srivastava Committee Member
Keywords	Sigma-Delta modulation wireless sensor networks distributed detection
Date of Defense	2007-05-01
Availability	unrestricted
Abstract We present a new scheme of distributed detection in sensor networks using Sigma-Delta modulation. In the existing works local sensor nodes either quantize the observation or directly scale the analog observation and then transmit the processed information independently over wireless channels to a fusion center. In this thesis we exploit the advantages of integrating modulation as a local processor into sensor design and propose a novel mixing topology of parallel and serial configurations for distributed detection system, enabling each sensor to transmit binary information to the fusion center, while preserving the analog information through collaborative processing. We develop suboptimal fusion algorithms for the proposed system and provide both theoretical analysis and various simulation results to demonstrate the superiority of our proposed scheme in both AWGN and fading channels in terms of the resulting detection error probability by comparison with the existing approaches.
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