Showing papers by "Ali Abdi published in 1998"
TL;DR: The authors have accurately approximated the Rayleigh-lognormal distribution by the K distribution, which is simpler and thus more appropriate for analysis and design of wireless communication systems.
Abstract: The Rayleigh-lognormal distribution, which has proved useful for modelling fading-shadowing wireless channels, has a complicated integral form. The authors have accurately approximated it by the K distribution. This distribution is simpler and thus more appropriate for analysis and design of wireless communication systems.
310 citations
01 Dec 1998
TL;DR: In this article, the rate of maxima of the received signal envelope is proposed as a new velocity estimator, and the performance of this estimator in the presence of Gaussian noise, nonisotropic scattering, Rayleigh fading, and lognormal shadowing is compared with the conventional zero crossing rate estimator.
Abstract: Velocity estimation is of great importance in mobile cellular systems and is essential for satisfactory handoff performance, effective dynamic channel assignment, etc In this article, the rate of maxima of the received signal envelope is proposed as a new velocity estimator Required formulas are derived analytically, and the performance of this estimator in the presence of Gaussian noise, nonisotropic scattering, Rayleigh fading, and lognormal shadowing is compared with the conventional zero crossing rate estimator This new estimator has much superior robustness against variations of SNR and scattering density, and similar to the zero crossing rate estimator, its quality deteriorates in the presence of shadowing
32 citations