Abstract
In this paper, a geometric multiple-input multiple-output (MIMO) channel model is proposed for millimeter-wave (mmWave) mobile-to-mobile (M2M) applications based on the two-ring reference model. The cluster-based nonisotropic scattering is considered, where all the clusters are located on the two rings centered on the transmitter and receiver. Intra-cluster azimuth spread of scatterers is characterized according to mmWave channel characteristics. Based on the proposed model, the time correlation function and Doppler power spectrum are obtained. It is found that a small number of clusters lead to high time correlation function, and the correlation is related to the degree of intra-cluster nonisotropic scattering, especially when cluster number is small. Moreover, the Doppler power spectrum is similar to the U-shaped spectrum. The cluster number, intra-cluster spread, and antenna spacing all have strong impacts on the Doppler power spectrum. The proposed model is useful for the design and evaluation of mmWave M2M communication system.
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