TY  - CHAP
AU  - Nagy, Lajos
TI  - Comparison and application of FDTD and ray optical method for indoor wave propagation modeling
T2  - Proceedings of the Fourth European Conference on Antennas and Propagation
PB  - Institute of Electrical and Electronics Engineers (IEEE)
CY  - New York, New York
SN  - 9781424464319
PY  - 2010
PG  - 3
UR  - https://m2.mtmt.hu/api/publication/2669215
ID  - 2669215
N1  - WoS:hiba:000296541701144 2020-01-09 04:41 típus nem egyezik
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Valcarce, A
AU  - De La Roche, G
AU  - Jüttner, Alpár
AU  - Lpez-Pérez, D
AU  - Zhang, J
TI  - Applying FDTD to the coverage prediction of wiMAX femtocells
JF  - EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING
J2  - EURASIP J WIREL COMM
VL  - 2009
PY  - 2009
SN  - 1687-1472
DO  - 10.1155/2009/308606
UR  - https://m2.mtmt.hu/api/publication/2164389
ID  - 2164389
N1  - 
AB  - Femtocells, or home base stations, are a potential future solution for operators to increase indoor coverage and reduce network cost. In a real WiMAX femtocell deployment in residential areas covered by WiMAX macrocells, interference is very likely to occur both in the streets and certain indoor regions. Propagation models that take into account both the outdoor and indoor channel characteristics are thus necessary for the purpose of WiMAX network planning in the presence of femtocells. In this paper, the finite-difference time-domain (FDTD) method is adapted for the computation of radiowave propagation predictions at WiMAX frequencies. This model is particularly suitable for the study of hybrid indoor/outdoor scenarios and thus well adapted for the case of WiMAX femtocells in residential environments. Two optimization methods are proposed for the reduction of the FDTD simulation time: the reduction of the simulation frequency for problem simplification and a parallel graphics processing units (GPUs) implementation. The calibration of the model is then thoroughly described. First, the calibration of the absorbing boundary condition, necessary for proper coverage predictions, is presented. Then a calibration of the material parameters that minimizes the error function between simulation and real measurements is proposed. Finally, some mobile WiMAX system-level simulations that make use of the presented propagation model are presented to illustrate the applicability of the model for the study of femto- to macrointerference.
LA  - English
DB  - MTMT
ER  -