Achievable Sampling Rate without Under/Overflows

I need some understanding of what reasonably achievable sample rates are
using GNU Radio to implement a packet base radio.

For example, I’m running into D’s at only 430 k/samples. This is running
a
packet detecting radio using bpsk.

Those who have working OFDM radios, what sample rates does your system
support without over/underflow? How about those with QPSK radios
detecting
packets, what samle rate can you support?

I’m not using a multi-rate approach, so I know there are gains to be had
in
my design. But for a BPSK radio with packet detection (and full
synchronization), I’m surprised I’m hitting the low limits of what the
USRP
requires already.

Thanks,
Rich

On 03/27/2015 01:01 PM, Richard B. wrote:

I’m not using a multi-rate approach, so I know there are gains to be
[email protected]
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
The answer is, unfortunately, “it depends”.

For example, I’m running a very simple radio astronomy “flow” on an
Odroid XU3 at 2 x 11.5Msps,without overruns (except occasionally).

What type of computer are you using? Have you made certain that any
filters you have in your flow don’t have horrendous filter lengths?
That’s very often a cause of newcomers getting poor performance out
of their signal flows. They specify a filter with far-too-aggressive
“skirts”, which yields a filter that is 10 times longer than it
really needs to be, for example.

Understood MarcusL. The question remains, what are some example sample
rates your radio’s can support? I’m requesting a reference.

Thanks,
Rich

Hi Richard,

there’s definitely people doing working real-time IEEE 802.11a/b/g
decoding/encoding [1] at 10MHz and 20MHz bandwidths (==sampling rates).

Greetings,
Marcus

[1] http://dl.acm.org/citation.cfm?doid=2643230.2643240
[2] http://dl.acm.org/citation.cfm?doid=2491246.2491248 Table 1

Ah, sorry, it’s all from the WiMe project site,
http://www.ccs-labs.org/projects/wime/
where there are further papers you can download for free.

Greetings,
Marcus

On Sat, Mar 28, 2015 at 9:35 AM, Marcus M. [email protected]
wrote:

Just an FYI…reference [1] is not available to ACM non-members
without purchase.

This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.

| Privacy Policy | Terms of Service | Remote Ruby Jobs