Silvus StreamCaster MIMO - Table 13 RSSI Reporting Format

StreamCaster MIMO Radio User Manual 3/17/15
10017C000 Silvus Technologies Confidential Page
61
Report Type
Data Type
Information
5009
Empty string ""
Begin of RSSI report
5010
Float
Revision number for RSSI report
5000
Integer
Raw signal power of first antenna,
represented in half dBm steps.
5001
Integer
Raw signal power of second antenna
represented in half dBm steps.
5002
Integer
Raw signal power of third antenna
represented in half dBm steps.
5003
Integer
Raw signal power of fourth antenna
represented in half dBm steps.
5004
Integer
Raw noise power represented in half dBm
steps.
5005
32-bit integer
Sync signal power (from digital domain, see
note below).
5006
32-bit integer
Sync noise power (from digital domain, see
note below).
5007
16-bit integer
Node ID of the radio.
5008
32-bit integer
Report sequence number, increments for
every report, resets after 9999.
1
Empty string ""
End of report.
Table 13 RSSI Reporting Format
Note:
The sync noise and power (types 5005, 5006) are special values obtained after packet processing
in the digital domain. They cannot be directly compared to the raw signal and noise values. To
obtain an SNR from these values the user needs to run the below formula on these values:
X = sync signal power;
Y = sync noise power;
Z = (Y-X)/51
SNR_mw = (X – 12 * Z)/(64 * Z)
SNR_db = 10 * log(SNR_mw)/log(10)
SNR_db is the SNR in dB and it is averaged across all antennae.
The SNR obtained above is more accurate when the real SNR goes below 10 dB. Above 10 dB,
the SNR obtained from the raw signal and noise values are more accurate.
Below is an example of the RSSI report:
Report Type
Length
Information
5009
1
""