We discuss a method of the turbulence poloidal spectrum measurements, which utilizes conventional fixed frequency O-mode reflectometry. The method is extended to the case of arbitrary plasma density profiles employing the stratified model of radial density distribution. The technique is applied to estimate the poloidal spectrum, amplitude and rotation velocity of density fluctuations in the edge plasma during a standard H-mode discharge on the ASDEX Upgrade tokamak, making use of the available edge reflectometer channels.