Hi Marcus,
Thank you very much for your help! I will definitely ask there.
Last question, I have checked that the USRPs B-210 are not recommended
for MIMO systems (more than 2x2). Could you please give any details
regarding the reason why it is not recommended? Does it have to do with
the available bandwidth or there is anything else to consider?
Thank you very much again!
Best regards,
Maria Jesus
On 31/01/2019 15:29, Marcus D Leech wrote:
I think that would be fairly heavy, requiring a high end machine.
There are some implementers of DVB on the gnuradio mailing list, so
I’d ask there about processing requirements to guide your decisions.
Sent from my iPhone
On Jan 31, 2019, at 10:10 AM, Maria Jesus Cañavate Sanchez via
USRP-users <usrp-users@lists.ettus.com
<mailto:usrp-users@lists.ettus.com>> wrote:
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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