השוואת שיטות

	מודל התפשטות על-פי קרני אור	תורת אפנון תדר רב-נושא אורתוגונלי (OFDM)
תחום	תקשורת	תקשורת
משפחה	Process / pipeline	Process / pipeline
שנת המקור	1993	1971
הוגה השיטה	Maciel, Bertoni, and Xia	Weinstein and Ebert
סוג	deterministic propagation algorithm	multicarrier modulation scheme
מקור מכונן	Maciel, T. F., Bertoni, H. L., & Xia, H. H. (1993). Unified approach to prediction of propagation over buildings for all ranges of frequencies. IEEE Transactions on Vehicular Technology, 42(1), 41-45.	Weinstein, S. B., & Ebert, P. M. (1971). Data transmission by frequency-division multiplexing using the discrete Fourier transform. IEEE Transactions on Communication Technology, 19(5), 628-634.
כינויים	deterministic propagation, site-specific modeling	multicarrier modulation
קשורות	4	5
תקציר	Ray tracing is a deterministic propagation modeling technique for predicting electromagnetic field strength at specific locations. Instead of empirical formulas (like Okumura-Hata), ray tracing traces paths of electromagnetic energy as it reflects, diffracts, and scatters off buildings and terrain. With accurate 3D geometry and material properties, ray tracing predicts site-specific path loss, multipath delay profiles, and angle of arrival, making it ideal for detailed coverage planning, interference analysis, and system design. Ray tracing is now standard in professional cellular planning tools.	OFDM is a multicarrier modulation technique that divides a wideband channel into many narrowband orthogonal subcarriers. Introduced by Weinstein and Ebert in 1971, it exploits the duality between time and frequency domains to efficiently use spectrum while mitigating intersymbol interference in frequency-selective channels. OFDM is now the standard for high-speed wireless systems including WiFi, cellular LTE, and digital broadcasting.