Received signal strength in dBm.
Tue Jul 6 13:05:50 PDT 2004
Hi there. Sorry for bringing this up again, but I'm
having a hard
time getting signal strength in dBm for received
My setup: Keith Smith's linuxAP, w/ hostap-0.0.4
(modified by me).
What I have done so far:
- upgraded the STA firmware to 1.5.6;
- updated the hostap driver in LinuxAP to use
dBmAdjust to get the
value translated to dBm (rxdesc->signal -
It turns out that dBmAdjust = 0x64 (100). I changed
client's (Cisco 340) and the AP's drivers to print the
strength in dBm. I then ran ping from the client to
the AP. When the AP
is reporting -51dBm, the card is reporting -37dBm,
with some random
oscillation around both values.
My card uses txpower=15dBm, which is probably close to
what the prism
card in the AP uses (iwconfig returned no value in the
AP). The path
loss in both ways should be similar. So, it seems to
me that dBmAdjust
should be 115, or something close to that. I could by
no means find a
reason for this +-15dB difference I'm getting.
Any hints? ANY help will be greatly appreciated.
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