قارن الطرق

	نموذج أوكومورا-هاتا للتنبؤ بفقدان المسار	تقنية الإدخال المتعدد والإخراج المتعدد (MIMO)
المجال	الاتصالات	الاتصالات
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1968	1995
صاحب الطريقة	Masahiro Okumura and Masahiro Hata	Telatar, Foschini, and Gans
النوع	empirical path loss model	spatial multiplexing technique
المصدر التأسيسي	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.	Telatar, I. (1999). Capacity of multi-antenna Gaussian channels. European Transactions on Telecommunications, 10(6), 585-595.
الأسماء البديلة	path loss model, propagation prediction	spatial multiplexing, antenna diversity
ذات صلة	4	5
الملخص	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.	MIMO is a technique that uses multiple transmit and receive antennas to significantly increase channel capacity and reliability. Pioneered theoretically by Telatar (1999) and Foschini & Gans (1998), MIMO exploits multipath propagation—typically a liability in wireless—as an asset by creating independent spatial channels. It is now fundamental to all modern wireless systems including LTE, WiFi-6, and 5G, where it provides both capacity gains through spatial multiplexing and robustness through diversity.