Millimeter-Wave Propagation in Indoor Corridors

In this letter, ray-based models for both line-of-sight (LOS) and non-line-of-sight (NLOS) indoor corridors are presented and compared with results of propagation measurements performed at millimeter (mm)-waves in the 60-GHz frequency band. It is shown that in the LOS corridor case, signals propagate like in free space and in a guided fashion in near and far zones, respectively. A nine-ray model (LOS path plus four first-order and four second-order reflections from the corridor walls, ground, and ceiling) is found to be suitable in characterizing propagation signals in far zone in this environment. In the NLOS corridor case, multiray models with a heuristic diffraction coefficient are used in the field simulation. Results show that a model with eight rays is adequate in characterizing both average power and variation of signals. However, in characterizing the average decay of signal power, only two diffracted rays are needed. Also, empirical models given for NLOS corridors cases indicate that diffraction is the dominant propagation phenomenon in the environment. Furthermore, multipath power distributions are investigated. It is found that Rayleigh and double-Rayleigh distributions are the bounds for both the LOS and NLOS data. Multiple-Rayleigh distribution can fit the measurement data very accurately.