Stephan Haefner

Stochastic/deterministic behavior of cross polarization discrimination in mmWave channels

Large absolute channel bandwidths at millimeter wave (mmWave) frequencies and more directional antenna gains may lead to quasi-deterministic (less random) channel fading behavior. Randomness in the cross polarization discrimination (XPD) is an attribute related to the channel fading behavior. In narrow-band channels, it is usually modeled as a log-normal random variable. From channel modeling perspectives, XPD power level in a particular propagation environment and its degree of randomness are of fundamental interest. In this paper, XPD behavior is characterized as a function of bandwidth in 4 different propagation setups including line of sight (LOS), reflections from black board, a rough wall and double bounce reflections from both surfaces. It has been observed that in all cases, the coefficient of variation of XPD around its mean value reduces exponentially with an increase in channel bandwidth demonstrating an evolution towards quasi-deterministic channel behavior. Additionally, a 5–10 dB difference in XPD values has also been observed between narrow-band and UWB channels in the considered propagation setups.