On Mon, Aug 27, 2012 at 7:07 AM, Qing Yang <
address@hidden> wrote:
> Hi there,
>
> I am currently doing a OFDM transceiver project based on RawOFDM. We want to
> implement 20MHz bandwidth transmit/receive, but the RawOFDM code seems to
> support only narrow band (<1MHz). Once I set the sample-rate larger than
> 1MHz, my program will block with overrun messages (more details here
>
http://lists.gnu.org/archive/html/discuss-gnuradio/2012-08/msg00069.html). I
> think the reason is that at 20MHz sample-rate, USRP produces too much data
> for the PC to process and drain PC's computation power.
>
> To boost the speed, I have two questions
>
> 1) My cpu have 8 threads(4 cores), can I manually dedicate one thread to
> each gr block, and make it a pipe-line system? Tom mentioned that gnuradio
> use a "thread-per-block" scheduler
> (
http://lists.gnu.org/archive/html/discuss-gnuradio/2010-09/msg00274.html)
> but in my case only two threads are 100% occupied when I run the program.
>
> 2) Inside some blocks, we extensively use vector multiplications (e.g.,
> precoding, CFO compensation). I've heard about the use of SSE to boost the
> speed of vector multiplication. How can I utilize this technology in my
> program?
>
>
> Best regards,
> --
> Yang, Qing
> Information Engineering, CUHK