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- Jill K. Nelson, Jaime E. Almodovar, Maya R. Gupta, William H. Mortensen
- 2009 IEEE International Conference on Acoustics…
- 2009

We consider the estimation of the locations of multiple transmitters based on received signal strength measurements at a network of randomly-placed receivers. We generalize the expectation-maximization (EM) method to create a quasi EM algorithm for localization under lognormal shadowing. Simulated performance is compared to a state-of-the-art global… (More)

- Jill K. Nelson, Maya R. Gupta, Jaime E. Almodovar, William H. Mortensen
- IEEE Signal Processing Letters
- 2009

We consider estimating multiple transmitter locations based on received signal strength measurements by a sensor network of randomly located receivers. This problem is motivated by the search for available spectrum in cognitive radio applications. We create a quasi expectation maximization (EM) algorithm for localization under lognormal shadowing. Simulated… (More)

Weighted nearest-neighbor classification is analyzed in terms of squared error of class probability estimates. Two classes of algorithms for calculating weights are studied with respect to their ability to minimize the first-order term of the squared error: local linear regression and a new class termed regularized linear interpolation. A number of variants… (More)

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