----- Original Message ----
From: Matt Ettus <[EMAIL PROTECTED]>
To: Bill Stevenson <[EMAIL PROTECTED]>
Cc: discuss-gnuradio@gnu.org
Sent: Sunday, September 21, 2008 10:26:32 PM
Subject: Re: [Discuss-gnuradio] question about the receiver sensitivity
Bill Stevenson wrote:
> Hello, all
>
> I am using USRP1 board with RFX Transceivers and I want to know the
> receiver sensitivity of the daugterboards. For example, for BER less
> than 1e-5 and data rate 54Mbps, the 802.11a standard specifies the
> receiver sensitivity to be at least -65dbm. Once the receiver
> sensitivity is known, the transmission range will be determined, so i
> want to know the sensitivity for the RFX boards. Could anyone tell me?
> Thank you!
Sensitivity is a very hard parameter to define, since it depends on many
factors including the modulation system in use. The best way to spec a
general radio is with the noise figure. The RFX boards all have a noise
figure in the 6-10 dB range. If you need one lower than that you can
use an LNA in front of it.
Matt
Thank you Matt!
What did u mean that RFX boards have a noise figure in 6-10dB range? Could u
tell me the sensitivity for the USRP receiver boards with respect to different
data rate, say from 100Kbps to 1Mbps with a step of 100Kbps? One thing
confusing me is that the receiver sensitivity under different data rate
specified in 802.11a is measured by lots of testing or it is decided by some
certain organizations? If it were the later case, I would not care about the
receiver sensitivity cuz I can also specify it by myself. Does anyone know
this? Any help will be highly appreciated!
The reason I wanna know the receiver boards' sensitivity is I am trying to find
out the transmission range with regard to some data rate, say 100Kbps,
200Kbps,etc. Is there any other way to work this out without knowing the
receiver boards' sensitivity? Thanks!!!
Bill
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