What is Rician Fading?
Rician Fading is a stochastic model for radio signal propagation. It describes the "interference" that occurs when a signal reaches a receiver via multiple paths, but with one dominant, direct path (Line-of-Sight) leading the way.
Original Carrier Wave (Reference)
Physical Passband Signal (Faded EM Wave)
Phasor (IQ Plane)
Baseband Envelope
How to Use This Simulator
The Phasor Diagram (Top Visual)
Blue Arrow: Represents the fixed Line-of-Sight (LoS) component. This is the direct path from the transmitter.
Green Arrow: Represents the Multipath/Scattered components bouncing off buildings or trees.
Red Arrow: The Actual Signal your device receives (the vector sum of the LoS and Scattered components).
The K-Factor Slider
- Set it to 0: Notice the Blue arrow disappears. This is Rayleigh Fading, common in dense cities where you cannot see the cell tower. The signal fluctuates wildly and can hit "deep fades" (zero signal).
- Set it to 20: The Blue arrow is dominant. The signal becomes very stable. This is like standing right next to a Wi-Fi router.
The Doppler Shift Slider
This simulates Speed. A high Doppler value means the receiver is moving fast (e.g., in a car), causing the signal phase and amplitude to fluctuate rapidly. Low Doppler represents a stationary or slow-moving user.
- Visualizing Summation: Students often struggle to understand that fading is just vector addition in the complex plane. This tool makes that mathematical relationship visible in real-time.
- K-Factor Intuition: It demonstrates that Rician fading is a "general" model of fading, where Rayleigh Fading is simply the special case where K = 0.
- Real-time Response: By interacting with the parameters, learners gain instant visual feedback on how environmental factors affect signal reliability and link quality.