Side loading of content elements is provided. The method includes steps of varying the hydrostatic stress on the sample by changing the density of the fluid medium over a range of densities, determining a change in apparent weight of the sample as the density of the fluid medium is changed, and determining the volumetric strain in the sample based on the change in apparent weight of the sample and the change in density of the fluid medium. A model is then constructed from the energy-normalized frequency components and can be used for speech recognition and speech enhancement. A time variation parameter and a frequency variation parameter of the channel for the burst are computed using the channel information at the pilot subcarriers for the transmissions in the burst.