What is fade margin & how it is calculated?
What is fade margin & how it is calculated?
Adjacent channel interference fade margin is calculated as the difference between the median signal level and the total adjacent channel interference level, minus the required desired carrier-to-adjacent channel interference level to achieve acceptable performance.
What is a good fade margin?
A fade margin of 10 dB is an absolute minimum. This would only be acceptable for links less than 3 miles or so. Up to 5 miles should have at least a 15 dB fade margin, and links greater than that should be higher. A fade margin of 25 dB is recommended for links greater than 5 miles.
Why do we need fading margin?
In telecommunication, the term fade margin (fading margin) has the following meanings: A design allowance that provides for sufficient system gain or sensitivity to accommodate expected fading, for the purpose of ensuring that the required quality of service is maintained.
What is the difference between fading and shadowing?
Fading is a significant part of any wireless communication design and is important to model and predict accurately. Large scale shadowing, on the other hand, is very dependent on location with respect to obstacles; its modeling often consists in predicting the likelihood of outage.
How do I increase my fade margin?
First, what is fade margin?
- Increase antenna height to get the antenna above obstacles.
- Select antennas with higher gain.
- Reduce the radio data rate to get better receiver sensitivity.
- Add a repeater between the sites.
What is slow fading margin?
Shadow fading indicates the fading brought by obstruction due to a building or a natural feature. Shadow fading changes slowly, and is thus called “slow fading”. This is called the “slow fading margin”, or the “shadow fading margin”.
How fade margin can be increased?
Increase antenna height to get the antenna above obstacles. Select antennas with higher gain. Reduce the radio data rate to get better receiver sensitivity. Add a repeater between the sites.
What is fading margin and receiver sensitivity?
Fade Margin is an expression for how much margin – in dB – there is between the received signal strength level and the receiver sensitivity of the radio. The figure below describes the term fade margin. Site A is transmitting with 33dBm (2W) power.
What is fading explain?
In Wireless Communication, fading refers to the attenuation of the transmitted signal power due to various variables during wireless propagation. Fading can cause decline in performance in a wireless communication system because it results in the loss of signal power thus reducing the Signal to Noise Ratio (SNR).
What is fade margin in wireless?
The Fade Margin is the difference between the Received Signal Strength and the radio Receiver Sensitivity . When you deploy a link you want to have a Receive Signal Strength that is sufficiently above the radio Receiver Sensitivity in order to survive signal fading due to a variety of factors.
What are the types of fading?
1.) Large Scale Fading
- a) Path loss. The free space path loss can be expressed as follows.
- b) Shadowing effect. •
- a) Flat fading.
- b) Frequency Selective fading.
- c) Fast fading.
- d) Slow fading.
- Rayleigh fading.
- Rician fading.
What is difference between fading and attenuation?
Attenuation is the lowering of the signal not frequency depending but (normally) over all frequencies. Fading is the lowering of the signal in time and freqnency, phase can also be effected.
