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What is Wireless RSSI level ?

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RSSI (Recieved Signal Strength Indicator) is a common name for the signal strength in a wireless network environment. It is a measure of the power level that a RF client device is receiving from an access point, for example. RSSI is the relative signal strength in a wireless environment and can be measured in any unit of power. It is often expressed in decibels (db), or as percentage values between 1-100, and can be either a negative, or a positive value.

The closer the figure is to zero, the better. For example, RSSI of -65 is better than -85. As a general example, a good signal would be -50, a reasonable would be -75, and a bad one would be -90, while -100 would provide no service at all.

To get a meaniful measurement of a good quality signal, you would have to subtract the noise on the line from that signal power level and consider the difference. A higher difference of signal to noise indicates better signal.

Notes:
Look at the RSSI only on an associated client
Some older chipsets used RSSI from 0 to 256, or 0 to 127. Most newer chipsets use 0 to 100.


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by Sabbir - 2015-09-16 01:55
Thank you . but can you explain the relation what is the relation between RSCP and RSSI
by Philip - 2015-09-16 07:47
Here is the relation between RSSI and RSCP.

RSSI is the Rx level without considering and before descrambling / dispreading / noise on the line.
RSSI (dBm) = RSCP (dBm) - Ec/Io (dB)

RSCP = Received Signal code power. It is the collected RF energy after the correlation / descrambling process.
RSCP (dBm) = RSSI (dBm) + Ec/No (dB)

Ec: scrambling code energy per chip
No: Total energy per chip (as measured by a UE).
Io: Total energy per chip (as measured by a scanning device).

Ec/No: signal-to-noise ratio (as measured by a client). Energy per chip over the noise, a measure of the quality of the signal.

Ec/Io: signal-to-noise ratio (as measured by a scanning device). It is the ratio of the received energy per chip (code bit) and the interference level, usually in dB. If there is no interference present, the interference level is equal to the noise level.
by anonymous - 2016-09-28 02:58
does all the devices has inbuilt rssi
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