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RE: [Discuss-gnuradio] Considerations for new hardware in gnuradio

From: Bruce Stansby
Subject: RE: [Discuss-gnuradio] Considerations for new hardware in gnuradio
Date: Tue, 30 Mar 2010 05:43:59 +0000

The ability to drop bits off in hardware would be a great feature, at the 
moment I have three high end digitizers and could double my bandwidth/ or 
quadruple if they had this feature.

Most astronomy applications can get away with 2 bits, 4 nice, and 8 is a waist, 
I have several applications that our USRP2 would be perfect for if we could get 
rid of bits in the FPGA, with out being FPGA programmers.
From: address@hidden address@hidden on behalf of Marcus D. Leech address@hidden
Sent: Tuesday, 30 March 2010 1:10 PM
To: address@hidden
Subject: Re: [Discuss-gnuradio] Considerations for new hardware in gnuradio

On 03/29/2010 11:13 PM, George Nychis wrote:
> Short but sweet response.  It would be great to have a SDR hardware
> board that works with GNU Radio that has a very, very, low latency
> connection to the host, like PCI express.  Similar to the Microsoft
> Research SDR (previously named SORA).  That would be great and open up
> possibilities of low latency MAC protocol implementations.
> Just sayin'!
> - George
More bandwidth == definitely_better

But IM(PNS)HO you don't want receiver cards living inside a PC cabinet.
Which is why I like the
  USRP "remote" philosophy.

I'm thinking about doing some hardware myself, for the specific purpose
of radio astronomy:

    o integrated LNA/downconverter/sampler
    o common LO/sample-clock for all antenna
    o 1GiGE, probably using a compact (4-bit) coding to improve channel

This would appeal to only a small fraction of all Gnu Radio users, to be

But there are some themes that are common to other applications:

    o robust phase coherence  (any kind of aperture synthesis requires this)
    o high bandwidth (sometimes at the expense of code bits)

Fit in a tighter cost envelope.  :-)


Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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