Alvarion BreezeACCESS 4900 Specifications Page 125

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Chapter 4 - Operation and Administration Menus and Parameters
BreezeACCESS 4900 99 System Manual
The average RSSI is calculated using the formula:
NewAvgRSSI = (PrevAvgRSSI*HistWeight) + CrtRSSI*(1 - HistWeight), where:
NewAvgRSSI = New Average RSSI
PrevAvgRSSI = Previous Average RSSI
CrtRSSI = RSSI of the current packet
HistWeight = History Weight
The History Weight is given by the next formula:
HistWeight = 0.9 / (PastTime / 2
SNR_Memory_Factor
+ 1), where
PastTime = time between the current packet and previous packet, in seconds
SNR_Memory_Factor = the Average SNR Memory Factor configurable parameter
(see “Average SNR Memory Factor” on page 168).
The SNR_Memory_Factor can be -1 in this case the history is not used and the
Average RSSI is the RSSI of the current packet.
The same formula is used also for calculating Average SNR (SNR values are used
instead of RSSI values).
Press the Esc key to abort the test.
4.2.5.3.2 Continuous Noise Floor Display
The Continuous Noise Floor Display option displays continuously updated
information regarding the average noise floor in the wireless link. It also displays
continuously updated information about the Signal Interference Ratio. Signal
Interference Ratio (SIR) is the average SNR for all pulses and physical errors
received by the unit. The average has the same formula used for calculation of
SNR per CPE.
Click the Esc key to abort the test.
4.2.5.3.3 Continuous UpLink Quality Indicator Display
The Continuous UpLink Quality Indicator Display option displays continuously
updated information regarding the average quality of the wireless link to the AU,
using the dynamically updated average modulation level measurements. The Link
Quality Indicator (LQI) calculation is performed using the formula:
LQI = (0.9 x "Previous LQI") + (0.1 x "Last Successful Modulation Level").
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