This paper presents a general approach for modeling the impact of mobile scattering clusters on the Doppler spectrum in wideband Vehicle-to-Vehicle (V2V) communication channels. In the context of geometry-based stochastic channel models (GSCMs), we develop equal-delay contours for realistic modeling of location of moving scatterers in vehicular environments. Then, we utilize our developed model to simulate the taps Doppler spectra. Numeric results demonstrate that the Doppler power spectra produced using the presented model is very close to the results obtained from measurements of V2V channels in an expressway oncoming condition. Our model can also be used in different road conditions. Index Terms-Mobile scaterrer, Doppler-power spectrum, vehicle ad hoc, geometry-based stochastic models.

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In this paper, we investigate the throughput of wireless mobile Ad-Hoc networks with directional antennas at 60 GHz unlicensed band. A new model is proposed to characterize the performance of directional antennas operating in millimeter-wave frequency bands. Based on this, we introduce an appropriate interference model and derive a lower bound on the throughput capacity of millimeter-wave wireless Ad-Hoc networks. Monte-Carlo simulation is conducted to evaluate the validity of the analytical results.

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