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Omnidirectional SIR Formula:
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Omnidirectional SIR (Signal-to-Interference Ratio) represents the ratio of the signal strength from a mobile device to the interference it experiences from co-channel cells, assuming omnidirectional antennas. It is a crucial parameter in cellular network design and optimization.
The calculator uses the Omnidirectional SIR formula:
Where:
Explanation: The equation calculates the signal-to-interference ratio by considering interference from adjacent co-channel cells in a hexagonal cellular layout with omnidirectional antennas.
Details: Accurate SIR estimation is crucial for cellular network planning, frequency reuse pattern design, interference management, and ensuring adequate signal quality for mobile users.
Tips: Enter Frequency Reuse Ratio (q) and Propagation Path Loss Exponent (γ). Both values must be positive numbers. Typical values for γ range from 2 to 4 in urban environments.
Q1: What is Frequency Reuse Ratio?
A: Frequency Reuse Ratio refers to the ratio of the total number of available frequency channels to the number of channels used in a single cell or sector.
Q2: What is Propagation Path Loss Exponent?
A: Propagation Path Loss Exponent is a parameter used to model the path loss experienced by a signal as it travels through a medium. Its value is typically 2 for radar communications.
Q3: What are typical values for Frequency Reuse Ratio?
A: Typical values range from 1 to 4, with common values being 3, 4, or 7 in different cellular system designs.
Q4: Why is SIR important in cellular networks?
A: SIR determines the quality of service, affects call drop rates, and influences network capacity and coverage planning.
Q5: How does antenna directionality affect SIR?
A: Directional antennas can improve SIR by focusing transmission/reception in specific directions, reducing interference from other directions.