A new shadow model for indoor wireless channels at 60 GHz

There has been much interest in using MM-waves for high-speed indoor wireless communications. Signals generated by MM-wave systems must traverse various obstacles in typical office environments and experience shadowing and multipath. Circular polarization may be used to mitigate multipath. To perform an initial system design and determine typical ranges, statistical shadow models, such as log-normal models, are frequently employed at lower frequency bands. However, such models are scant at 60 GHz and most works provide statistics for small line-of-sight (LOS) regions. At large ranges, high penetration loss due to obstacles renders the environment more lossy and models suggesting path loss exponents around free-space values are questionable. We present a new shadow fading model at 60 GHz consisting of non-reflective, lossy obstacles and valid both for LOS and non-LOS situations. The input parameters are the obstacle density, and the mean and standard deviation of the obstacle loss. We provide analytical expressions for the mean, standard deviation, and angular correlation of excess loss, neglecting diffraction.