[USRP-users] GSM900 2G Implementation using USRP2-N200

Ben Hilburn ben.hilburn at ettus.com
Tue Feb 14 13:13:35 EST 2012


Correct.

Your limit will be what you can do in software, and the analog
interference, etc., of your channels.

Cheers,
Ben
----------------------------
Ben Hilburn <http://goo.gl/5DdZ3> @ Ettus Research, LLC<http://www.ettus.com/>



On Tue, Feb 14, 2012 at 4:05 AM, Amit Nevo <Amit.Nevo at hallo.co.il> wrote:

> Thomas, Ban and All,
>
> Thanks for your answer.
>
> Just to verify my understanding:
> Assuming we receive simultaneously multiple channels (upto 8x124 -
> theoretically)  from the 1GBE link, can we modulate these channels onto 124
> different sub-channels frequencies ( 200KHz spaced) of same 25MHz BW, by
> Digital Processing/Embedded DSP in FPGA device and later transmit them
> simultaneously on 900MHz carrier?
>
> Amit Nevo
>
>
>
> Amit.Nevo at hallo.co.il
> -----Original Message-----
> From: Thomas Tsou [mailto:ttsou at vt.edu]
> Sent: Thursday, February 09, 2012 8:17 PM
> To: Amit Nevo
> Cc: usrp-users at lists.ettus.com
> Subject: Re: [USRP-users] GSM900 2G Implementation using USRP2-N200
>
> On Thu, Feb 9, 2012 at 7:17 AM, Amit Nevo <Amit.Nevo at hallo.co.il> wrote:
> >
> > Hi all,
> >
> > I consider a GSM900 2G implementation using the USRP2-N200.
> >
> > I would like to know how many channels/AFRCN/sub carriers (of 8 slots
> each) does the USRP2-N200 support?
>
> With 25 MHz of bandwidth of the N200 you can digitize the entire
> (non-extended) GSM900 uplink or downlink if that's what you're interested
> in. As Ben said, the device views samples and bandwidth and not specific
> GSM
> channels.
>
> > If the number of supported channels is more than 1, what is the technique
> that the USRP2-N200 use to transmit multiple channels on single
> transmitter?
> >
> > If the answer is single channel, is there a USRP type that support more
> than one channel?
>
> Multiple channels can be supported using a channelizer / transmultiplexer
> with a single device. Support for that capability in the open version of
> OpenBTS is forthcoming.
>
>  Thomas
>
>
>
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