Mobile Radio Propagation Models

Flashcards on Mobile Radio Propagation Models

Mobile Radio Channel

The transmission media between a tower and a mobile phone, crucial for wireless communication.

Multipath Propagation

Occurs when signals reach the mobile station via multiple paths, leading to potential interference.

Fading

Rapid signal fluctuation due to interference, impacting signal strength at the mobile user.

Path Loss

Average signal attenuation over a distance, a key factor in signal strength.

Shadowing

Signal attenuation caused by obstacles like buildings or trees.

Doppler Shift

Frequency shift due to the relative motion between transmitter and receiver.

Large Scale Fading

Fading due to distance from the transmitter, including path loss and shadowing.

Small Scale Fading

Fading due to multipath propagation and Doppler effect, causing rapid amplitude changes.

Empirical Models

Models derived from measurement data in real-world environments.

Analytical Models

Models based on theory and geometry.

Statistical Models

Models using probabilistic behavior of fading.

Isotropic Antenna

Type of antenna that radiates energy in all directions.

Power Density Formula

Power transmitted * gain of transmitting antenna / (4 * pi * d^2)

Free Space Path Loss Model

Model that assumes a direct line of sight path between transmitter and receiver with no obstructions or reflections.

Two-Ray Model

The model considers both direct line of sight and ground-reflected paths, creating potential interference.

Two Ray model, Power is proportionate to:

Antenna height * antenna height/Distance to the fourth power

Flat Earth Model

It assumes the earth is flat and only direct and ground-reflected rays are considered.

Egley Model

Terrain based propagation model useful for urban and suburban environments.

Lee's Model

Model specifically designed for cellular systems; offers reference distance based path loss formula.

Okumura Hata Model

Fully empirical model based on extensive measurements in Tokyo, dividing areas into open, suburban, and urban categories.

Ibrahim and Parsons Model

Model focusing on the urban environment, incorporating factors like terrain height, urbanization, and land usage.

EIRP

Effective Isotropic Radiated Power