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Re: [Discuss-gnuradio] FW: Marc Epards 100Msps on XCVR2450

From: Per Zetterberg
Subject: Re: [Discuss-gnuradio] FW: Marc Epards 100Msps on XCVR2450
Date: Tue, 6 Mar 2012 21:13:06 +0000

I am mainly thinking about research, where you can e.g. insert gaps between the 
bursts, see e.g. http://arxiv.org/abs/1111.3616. Implementing stuff in fully 
real-time is anyway to big an effort. 

Another application is when you use the USRP as 


From: address@hidden address@hidden on behalf of address@hidden address@hidden
Sent: Tuesday, March 06, 2012 9:25 PM
To: address@hidden
Subject: Re: [Discuss-gnuradio] FW:  Marc Epards 100Msps on XCVR2450

Fair enough.  But how will the discontinuous-sampling done by this 100Msps mode 
affect things?


On Tue, 6 Mar 2012 18:43:43 +0000, Per Zetterberg wrote:

In my opinion/experience at least two-fold over-sampling is to be recommended 
with OFDM, The standard 802.11n has a mode with 40MHz bandwidth (not to mention 
802.11ac).  I have the feeling the dynamic range of 48dB is somewhat small for 
OFDM. Especially without fast AGC.


From: address@hidden<mailto:address@hidden> 
address@hidden<mailto:address@hidden>] on behalf of 
address@hidden<mailto:address@hidden> address@hidden<mailto:address@hidden>]
Sent: Tuesday, March 06, 2012 7:02 PM
To: address@hidden<mailto:address@hidden>
Subject: Re: [Discuss-gnuradio] Marc Epards 100Msps on XCVR2450

Not to disparage some fine work, but in the specific example cited, the 
existing, standard, 50Msps mode (8-bit samples) should also work, unless 48dB 
of dynamic range isn't adequate.


On Tue, 6 Mar 2012 17:28:54 +0000, Per Zetterberg wrote:

Hi Lists,

I have tried Marc Epards 100Msps hack from https://github.com/mepard/N210CeVI 
on XCVR2450. It's extremely cool. I verified that the 36MHz bandwidth option on 
the XCVR2450 actually works (and it does). With this kind of bandwidth it is 
possible to investigate true 802.11n and LTE signals (I wish we had this 
feature for TX as well).

Many thanks Marc!

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