How to read Radio Signal Strength(RSS) from WLAN card?

Can someone show me some methods or examples to read the Radio Signal Strength
from WLAN card?
Thanks a lot!

Are there any APIs which can be used directly to do this job?

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Are there any APIs which can be used directly to do this job?

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How can I query signal strength FROM an Aironet 1200 AP?

We are trying to query the signal strength of each connected client on Aironet 1200 APs from the AP.
Does anyone know of a way to achieve this?
We have examined the MIB documentation for an SNMP solution and have not found the reqired OID/MIB. This solution would be preferable, but at this point we are open to ideas.
Thank you.

Thank you and a follow up ...
Why is no data displayed in the Aironet 1200 SNMP MIB browse web interface when querrying this oid?
When I do a MIB browse from the SNMP web interface on an Aironet 1200 to OID 1.3.6.1.4.1.522.3.12.5.1.9 I do not receive any data in the MIB browse display. The extended statistics in awcTpFdbTable is enabled.
Thanks in advance
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Hi,
Is there any available cisco aironet model which enable administrator to configure the strength of the WiFi wireless radio signal? Example, we can tune to 10dB, 20dB, 30dB and yet maintaining the throughput (10 Mbps, 25 Mbps)
TQ

1) Some devices you configure the transmit power in the dBm values typically -1 0 1 2 5 8 11 14 17 20, other devices will do it based on mw values typically 100mw, 50mw, 25mw, 12.5mw, 6mw, 3mw, 1.5mw, etc.
2) There are some differences in the transmit power depending on the model of 1200 you have but for research purposes you should be fine.
3) No the transmit power can change based on the modulation See the charts below these are for an AIR-LAP1242AG-A-K9
802.11a/n Radio
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Active power levels by rate
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    48.0 to 48.0 , 16 dBm, changed due to regulatory maximum
    54.0 to 54.0 , 12 dBm, changed due to regulatory maximum
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48.0-b to 48.0-b, 16 dBm, changed due to regulatory maximum
54.0-b to 54.0-b, 12 dBm, changed due to regulatory maximum
     m0. to m4.   , 17 dBm
     m5. to m5.   , 15 dBm, changed due to regulatory maximum
     m6. to m6.   , 11 dBm, changed due to regulatory maximum
     m7. to m7.   , 10 dBm, changed due to regulatory maximum
     m8. to m12. , 17 dBm
    m13. to m13. , 15 dBm, changed due to regulatory maximum
    m14. to m14. , 11 dBm, changed due to regulatory maximum
    m15. to m15. , 10 dBm, changed due to regulatory maximum
   m0.-4 to m3.-4 , 17 dBm
   m4.-4 to m4.-4 , 16 dBm, changed due to regulatory maximum
   m5.-4 to m5.-4 , 14 dBm, changed due to regulatory maximum
   m6.-4 to m7.-4 , 10 dBm, changed due to regulatory maximum
   m8.-4 to m11.-4, 17 dBm
m12.-4 to m12.-4, 16 dBm, changed due to regulatory maximum
m13.-4 to m13.-4, 14 dBm, changed due to regulatory maximum
m14.-4 to m15.-4, 10 dBm, changed due to regulatory maximum
   6.0-d to 18.0-d, 17 dBm
24.0-d to 24.0-d, 16 dBm, changed due to regulatory maximum
36.0-d to 36.0-d, 15 dBm, changed due to regulatory maximum
48.0-d to 48.0-d, 14 dBm, changed due to regulatory maximum
54.0-d to 54.0-d, 10 dBm, changed due to regulatory maximum
OffChnl Power: 17, Rate 6.0
802.11b/g/n Radio
Configured Power: 20 dBm (level 1)
Active power levels by rate
     1.0 to 11.0 , 20 dBm
     6.0 to 48.0 , 17 dBm, changed due to regulatory maximum
    54.0 to 54.0 , 16 dBm, changed due to regulatory maximum
6.0-bf to 48.0-b, 17 dBm, changed due to regulatory maximum
54.0-b to 54.0-b, 16 dBm, changed due to regulatory maximum
     m0. to m5.   , 17 dBm, changed due to regulatory maximum
     m6. to m6.   , 16 dBm, changed due to regulatory maximum
     m7. to m7.   , 14 dBm, changed due to regulatory maximum
     m8. to m13. , 17 dBm, changed due to regulatory maximum
    m14. to m14. , 16 dBm, changed due to regulatory maximum
    m15. to m15. , 14 dBm, changed due to regulatory maximum
   m0.-4 to m4.-4 , 17 dBm, changed due to regulatory maximum
   m5.-4 to m6.-4 , 16 dBm, changed due to regulatory maximum
   m7.-4 to m7.-4 , 14 dBm, changed due to regulatory maximum
   m8.-4 to m12.-4, 17 dBm, changed due to regulatory maximum
m13.-4 to m14.-4, 16 dBm, changed due to regulatory maximum
m15.-4 to m15.-4, 14 dBm, changed due to regulatory maximum
   6.0-d to 18.0-d, 17 dBm, changed due to regulatory maximum
24.0-d to 36.0-d, 16 dBm, changed due to regulatory maximum
48.0-d to 48.0-d, 14 dBm, changed due to regulatory maximum
54.0-d to 54.0-d, 13 dBm, changed due to regulatory maximum
OffChnl Power: 20, Rate 1.0
Hope this helps
Please rate helpful posts.

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Ive used LabView for years but have been away a while. so much is new. Can the USRP be used for testing LTE mobile signal strength? and decode various fields like mibs and sibs? signal to noise? CIR? if not, is there something that is able to?
thanks

Hello Bradley,
Here is a short video showcasing one application involving NI Software Defined Radio for an 8x8 LTE MIMO, along with an article describing the application:
http://zone.ni.com/wv/app/doc/p/id/wv-2864
http://www.ni.com/white-paper/14311/en
http://electronicdesign.com/4g/getting-ready-8x8-mimo
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http://www.ni.com/usrp/
http://www.ni.com/white-paper/8787/en
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How to read Radio Signal Strength(RSS) from WLAN card?

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