Patent ID: 9282531
Filing Date: 2016-03-08
CPC Classification: G01S,H04B,H04W

Claim Text:
1. A method for determining a location of a device, comprising steps: measuring, in a receiver of the device, received signal strength (RSS) levels of reference signals transmitted by a set of access points (APs) arranged in an enclosed environment; initialize an expectation maximization procedure with a uniform distribution of path loss coefficients of the set of APs; evaluating an expectation of a joint log-likelihood of the RSS levels with respect to the uniform probability distribution of the path loss coefficients; updating the uniform distribution of the path loss coefficients; repeating the evaluating and the updating until a termination condition is satisfied to produce final path loss coefficients; and determining the location of the device based on the RSS levels and the final path loss coefficients, wherein the steps are performed in processor of the device.