... CorporationEURASIP Journal on Advances in Signal ProcessingVolume 2007, Article ID 41348, 11 pagesdoi:10.1155/2007/41348 Research Article Positioning Based on Factor Graphs Christian Mensing and Simon ... uplink and downlink mea-surements and are independent of the underlying wirelesscellular network.3. POSITIONING BASED ON FACTOR GRAPHS Historically, FGs as a generalization of Tanner graphs ... System:Theory and Applications, Volume 1, vol. 163 of Progress in As-tronautics and Aeronautics, American Institute of Aeronautics& Astronautics, Reston, Va, USA, 1996.[7] P.MisraandP.Enge,Global Positioning...