পদ্ধতির তুলনা করুন

	রে ট্রেসিং প্রোপাগেশন মডেল	অর্থোগোনাল ফ্রিকোয়েন্সি ডিভিশন মাল্টিপ্লেক্সিং (OFDM)	ওকুমুরা-হাটা পথ ক্ষতি পূর্বাভাস মডেল
ক্ষেত্র	টেলিযোগাযোগ	টেলিযোগাযোগ	টেলিযোগাযোগ
পরিবার	Process / pipeline	Process / pipeline	Process / pipeline
উদ্ভবের বছর	1993	1971	1968
প্রবর্তক	Maciel, Bertoni, and Xia	Weinstein and Ebert	Masahiro Okumura and Masahiro Hata
ধরন	deterministic propagation algorithm	multicarrier modulation scheme	empirical path loss model
মৌলিক উৎস	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.	Okumura, Y., Ohmori, E., Kawano, T., & Fukuda, K. (1968). Field strength and its variability in VHF and UHF land mobile radio service. Review of the Electrical Communication Laboratory, 16(9-10), 825-873.
অপর নাম	deterministic propagation, site-specific modeling	multicarrier modulation	path loss model, propagation prediction
সম্পর্কিত	4	5	4
সারসংক্ষেপ	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.	The Okumura-Hata model is an empirical propagation model for predicting path loss in mobile radio systems. Developed by Okumura (1968) and mathematically formalized by Hata (1980), it is one of the most widely used models for cellular network planning. The model predicts median path loss as a function of frequency, distance, and antenna heights, with environment-specific correction factors. Despite its age, the Okumura-Hata model remains a standard in 2G/3G planning and is often used as a baseline for more sophisticated models.