An analytical model for millimeter wave outdoor directional non-line-of-sight channels

Millimeter wave (mmWave) communications utilizing directional antennas are capable to support multi-Gbps data rate spanning indoor short range to outdoor cellular scenarios. However, unique channel characteristics of mmWave channels including high pathloss, penetration loss and sparse multi-path characteristics requires new channel models for mmWave network design. In this paper, a novel geometry based model is introduced for outdoor directional non-line-of-sight (NLOS) mmWave channels. By approximating signal propagation with first order reflections from buildings, a more tractable analytical expression for average NLOS received signal power is obtained. Further, the accuracy of the model is tested using exhaustive simulations for different input parameters such as building density, antenna beamwidth etc.