Cooperative Indoor Radio Environment Mapping in Ad-hoc Wireless Cognitive Networks

This paper presents a radio environment mapping method developed for use with ad-hoc wireless networks. Variations of the mapping algorithm were implemented in environment visualization office simulation platform developed in Matlab as a result of cooperation between Faculty of Electrical Engineering and Computing, University of Zagreb, Croatia, and Center for TeleInfrastruktur, University of Aalborg, Denmark. Mapping algorithm, theoretical background and variations, as well as the cooperative mapping scheme are described. Simulation results for environment mapping are given for several algorithm variations on the sample scenario with and without cooperative mapping protocols in order to optimize the algorithm. Mapping algorithm shows accurate results with 0.15 dB mean error and as low as 2.3 dB standard deviation. Cooperative mapping is shown to provide a clear advantage in both mapping speed and accuracy.