Decentralized sequential change detection using physical layer fusion

— We study the problem of decentralized sequential change detection with conditionally independent observations. The sensors form a star topology with a central node called fusion center as the hub. The sensors transmit a simple function of their observations in an analog fashion over a wireless Gaussian multiple access channel and operate under either a power constraint or an energy constraint. Simulations demonstrate that the proposed techniques have lower detection delays when compared with existing schemes. Moreover we demonstrate that the energy-constrained formulation enables better use of the total available energy than a power-constrained formulation.

• Type: Journal
• Year: 2007
• Where: CORR
• Authors: Leena Zacharias, Rajesh Sundaresan
• Keywords: CORR 2007, Education, Gaussian Multiple Access, Lower Detection Delays, Sequential Change Detection