1 research outputs found
Channel impulse response-based source localization in a diffusion-based molecular communication system
Molecular source localization finds its applications in future healthcare systems, including proactive diagnostics. This work localizes a molecular source in a diffusion based molecular communication (DbMC) system via a minimal set of passive anchor nodes and a fusion center. Two methods are presented which both utilize (the peak of) the channel impulse response measurements to uniquely localize the source, under the assumption that the molecular source of interest lies within the open convexâhull of the sensor/anchor nodes. The first method is a oneâshot, triangulationâbased approach which estimates the unknown location of the molecular source using leastâsquares method. The second method is an iterative approach, which utilizes the gradientâdescent control law to minimize a nonâconvex cost function. The corresponding CramerâRao bound (CRB) is also derived. Simulation results reveal that: i) the gradientâdescent method outperforms the triangulation method (in terms of mean squared error performance) for a wide range of values of signalâtoânoise ratio; ii) the gradientâdescent method converges to the true source location uniformly (in less than hundred iterations)