Comunicació presentada a la IEEE International Conference on Communications (ICC '08), celebrada a Beijing (Xina) els dies 19, 20, 21, 22 i 23 de maig de 2008, organitzada per l'Institute of Electrical and Electronics Engineers (IEEE).

Expressions relating spectral efficiency, power and Doppler spectrum are derived for low-power Rayleighfaded wireless channels with proper complex signaling. No/nside information on the state of the channel is assumed at the receiver. Rather, periodic reference signals are postulated in/naccordance with the functioning of most wireless systems. In contrast with most previous studies, which relied on block-fading channel models, a continuous-fading model is adopted. This embeds the Doppler spectrum directly in the/nderived expressions thereby imbuing them with practical significance.