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High-rank line-of-sight (LOS) MIMO systems have attracted considerableattention for millimeter wave and THz communications. The small wavelengths inthese frequencies enable spatial multiplexing with massive data rates at longdistances. Such systems are also being considered for multi-path non-LOS (NLOS)environments. In these scenarios, standard channel models based on plane wavescannot capture the curvature of each wave front necessary to model spatialmultiplexing. This work presents a novel and simple multi-path wireless channelparametrization where each path is replaced by a LOS path with a reflectedimage source. The model fully is valid for all paths with specular planarreflections and captures the spherical nature of each wave front. Importantly,it is shown that the model uses only two additional parameters relative to thestandard plane wave model. Moreover, the parameters can be easily captured instandard ray tracing. The accuracy of the approach is demonstrated on detailedray tracing simulations at 28 GHz and 140 GHz in a dense urban area.

Parametrization and Estimation of High-Rank Line-of-Sight MIMO Channels with Reflected Paths