เปรียบเทียบวิธี

	แบบจำลองการแพร่กระจายคลื่นแบบ Ray Tracing	การแบ่งความถี่แบบออร์โธโกนอล (Orthogonal Frequency Division Multiplexing - OFDM)
สาขาวิชา	โทรคมนาคม	โทรคมนาคม
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1993	1971
ผู้ริเริ่ม	Maciel, Bertoni, and Xia	Weinstein and Ebert
ประเภท	deterministic propagation algorithm	multicarrier modulation scheme
แหล่งต้นตำรับ	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.
ชื่อเรียกอื่น	deterministic propagation, site-specific modeling	multicarrier modulation
ที่เกี่ยวข้อง	4	5
สรุป	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.