TY - JOUR
T1 - Censored Multipath Component Cross-Polarization Ratio Modeling
AU - Karttunen, Aki
AU - Gustafson, Carl
AU - Molisch, Andreas F.
AU - Järveläinen, Jan
AU - Haneda, Katsuyuki
PY - 2017/2
Y1 - 2017/2
N2 - In wireless channel measurements, the relatively weak cross-polarized multipath components (MPCs) are typically severely affected by the measurement noise level. As shown in this letter, the typical cross-polarization ratio (XPR) model parameter estimation, which ignores the existence of censored samples, may lead to significant errors. We demonstrate how to achieve accurate parameter estimates with a maximum likelihood estimator that properly takes into account both the measured XPRs and the censored samples. Also, a new XPR model is presented in which the average XPR is modeled as a function of the MPC excess loss. The new model is shown to be insensitive to the channel measurement noise level. A practical example with measured data in an indoor environment at 60 GHz demonstrates the utility of the approach.
AB - In wireless channel measurements, the relatively weak cross-polarized multipath components (MPCs) are typically severely affected by the measurement noise level. As shown in this letter, the typical cross-polarization ratio (XPR) model parameter estimation, which ignores the existence of censored samples, may lead to significant errors. We demonstrate how to achieve accurate parameter estimates with a maximum likelihood estimator that properly takes into account both the measured XPRs and the censored samples. Also, a new XPR model is presented in which the average XPR is modeled as a function of the MPC excess loss. The new model is shown to be insensitive to the channel measurement noise level. A practical example with measured data in an indoor environment at 60 GHz demonstrates the utility of the approach.
KW - millimeter-wave propagation measurements
KW - cross-polarization ratio (XPR)
KW - maximum likelihood estimation
KW - channel characterization and modeling
KW - censored data
KW - radio propagation
U2 - 10.1109/LWC.2016.2633355
DO - 10.1109/LWC.2016.2633355
M3 - Letter
SN - 2162-2337
VL - 6
SP - 82
EP - 85
JO - IEEE Wireless Communications Letters
JF - IEEE Wireless Communications Letters
IS - 1
ER -