On 8/7/07, Zhuocheng Yang <[EMAIL PROTECTED]> wrote:
> Hi guys:
>
> I noticed that in the adc_interface, there are registers called rssi_0,
> rssi_1, rssi_2, and rssi_3. All of which are 32 bits. However, according to
> the header format:
> http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/doc/inband-signaling-usb
> The rssi should be 6 bits. Do I just use the lower 6 bits?
According to the instantiation:
http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/fpga/sdr_lib/adc_interface.v#L43
The lower 16 bits has the RSSI value, and the upper 16 bits has the
over-count value.
If you were to just use 6 bits of the RSSI value, I'd recommend the
MSBs and not the LSBs.
Is this really the RSSI - or should the RSSI actually be a function of
the amount of gain or attenuation in the RF stages? I am sure it gets
pretty difficult calculating an estimate for the amount of power at
the antenna.
Should this value be an expression in dB of the received power?
Brian
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