An indoor localization system for locating an electronic mobile device within an indoor environment is provided. The indoor localization system includes a plurality of transmitting nodes arranged in different positions within the indoor environment and configured to transmit RF signals. An electronic mobile device is configured to receive the RF signals from the transmitting nodes. The indoor localization system is configured to operate in a training mode, wherein reference quantities are computed based on powers of the RF signals received from the transmitting nodes in different reference positions within the indoor environment. The indoor localization system is further configured to operate in a locating mode, wherein current quantities are computed based on powers of the RF signals received by the electronic mobile device in its current location within the indoor environment from the transmitting nodes, and wherein the current location of the electronic mobile device is determined based on the current and the reference quantities. The indoor localization system is configured to operate based on RF signals over at least two different radio channels.