Hi Marcus and Leandro,
Thank you very much for your replies.
In order to narrow my question regarding the computer requirements to be
able to use the 160MHz bandwidth, I would say that we would like to use
GNU radio to send and receive DVB-S2 signals. Hence, the PC will do all
the processing to check the BER, constellation, EVM, etc. Do you think
it is possible to use a PC (with SSD drive and some suggested
requirements) which could do the processing in real time or the only way
to achieve that bandwidth in real time would be using the FPGA of the
USRP? If the second case, then I guess we will do the processing off-line =)
Thank you very much in advance!
Best regards,
Maria Jesus
On 30/01/2019 16:25, Leandro Echevarría wrote:
Sorry for the typo, I meant to write 6.4 Gbps.
Regards,
Leo
On Wed, Jan 30, 2019, 13:24 Leandro Echevarría
<leoechevar...@gmail.com <mailto:leoechevar...@gmail.com>> wrote:
Hello María,
The A/D converters on these daughterboards are complex samplers,
which means you get the full 200 MHz of bandwidth and no aliasing
will occur.
As for the computer requirements, one 32-bits-wide 200 MSps stream
equals 6.4 GBps (800 MBps), so you'll need a PCIe or NVMe SSD
drive at least.
Regards,
Leo
On Wed, Jan 30, 2019, 12:58 Maria Jesus Cañavate Sanchez via
USRP-users <usrp-users@lists.ettus.com
<mailto:usrp-users@lists.ettus.com>> wrote:
Hi there!
My name is Maria and I have some questions regarding the
maximum bandwidth achievable with the USRP X-series when it is
connected to a host PC.
1. If the daughterboard UBX160 is used, that means that the
maximum bandwidth achievable is 160MHz. However, the maximum
ADC sample rate of the USRP is 200MS/s, so if we take into
consideration the Nyquist theorem (sample rate = 2*
bandwidth), the maximum bandwidth that the USRP can _receive
_would be equal to 100MHz (or even lower to recover the signal
properly). On the other hand, the USRP can _transmit _a signal
with a 160MHz bandwidth as the maximum DAC is 800MS/s. Please,
let me know if this is correct.
2. In terms of the connection between the USRP and the PC,
there are different interfaces that can be used. If the USRP
is transmitting at 200MS/s and the dual 10Gigabit Ethernet for
two channels is used to transmit the signal from the USRP to
the PC (200MS/s), how could we make sure that the bandwidth of
the signal sent by using the USRP (let's say 80MHz, for
example) can be received properly by the PC? Which could be
the PC requirements for that (apart from allowing the use of
the 10 GigE, of course)?
3. Last question, as the maximum sample rate when the PC is
connected to the USRP is 200MS/s, that means that a signal
with a 160MHz bandwidth cannot be created through the PC and
transmitted to the USRP. If a 160MHz signal is required, that
signal has to be created directly on the FPGA, right? Which is
the maximum bandwidth that the combination USRP/PC could
handle (when using 200MS/s)?
Thank you very much for all your help in advance and sorry for
the long email.
Best regards,
Maria Jesus
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