Re: Soft-DVB has a Brother. A Receiving Brother. And Fast

Wow this is exciting! Folks we are on the verge of a paradime shift in
RF communications.

I’m not clear on the dvb standards, but is it safe to assume dvb-s would
need just a few tweaks on the dvb-t code or no?

Sent from my iPhone

On Jan 29, 2010, at 4:04 AM, Vincenzo P. [email protected]
wrote:

Hi GNURadio fellows,
considering that this list has grown to something highly relevant in
Software Defined Radio I thought it would have been a good idea to share
here a few thoughts I’ve been having since long and as well as a result
that was just achieved.

Since a few months after my first approach to SDR in 2006,
I thought I picked up two major facts about the technology:

.:. SDR infinite potential lying for sure in its flexibility but, even
more relevantly, in its ability to bypass
the costly HW-level design stage which is embedded in any
traditional radio design/production process

.:. Its equally infinite power-inefficiency compared to traditional,
HW-implemented competitor technologies.
In fact, ease of development as well as flexibility appear to be
inversely proportional to power efficiency.

The latter being in my opinion the reason for which SDR has been growing
for ages up to now but has never “exploded” as we could expect from a
technology cutting away a conspicuous part of the design costs of any
radio system.
Actually, flexibility and cost-efficiency, though considerable, do not
appear to be sufficient motivation for accepting to upscale power
requirements (at a given computational cost yielded by the implemented
wireless standard) by a factor which typically is in [100 ; 300].

Whether right or wrong, by working with these thoughts in mind, during
the research I’m carrying on at the University of Pisa, Italy while
doing my PhD here, I developed a novel implementation technique targeted
at software-implemented Signal Processing over General Purpose CPUs or
DSPs which we (at DSPCoLa lab, http://dspcola.iet.unipi.it ) call “MA”.
Current research results have shown that MA was able to increase by
slightly more than one order of magnitude the power efficiency of a
traditionally implemented (MA-free) SDR.

By applying such “MA” technology to the ETSI DVB-T receiver chain with
the help of:

Mario Di Dio (former master thesis student, now PhD Student at DSPCoLa)
Luca ROSE (former master thesis student at DSPCoLa, now PhD student
at Supélec Paris)

we obtained the receiving companion of Soft-DVB: SR-DVB.

Standing for Software Receiver - DVB,
SR-DVB is a fully software (all signal processing is done in pure C++
over the host computer) ETSI DVB-T receiver capable of running realtime

while providing 11.612 Mbps throughput

and absorbing less than 50% of computational resources available over an
Intel Q9400, 2.66 GHz CPU.

As long as MA was applied only to the two computationally-heaviest
blocks of the receive chain (i.e. Viterbi Decoding and OFDM synch), we
believe that considerable margins for improvement of the presented
result do exist. They will be explored in the next months.

SR-DVB will be presented in Karlsruhe at WSR 10
as the article:
“A Fully Software ETSI DVB-T Receiver Based on the USRP”

during such presentation also MA technology will be briefly outlined.

A demo video of our proof-of-concept receiver is available at

www.legalepellegrini.it/ing/SR-DVB_demo_long.VRO

as usual, mplayer or VLC wil play this camcorder mpeg2 viedo easily.

Best regards to all writers and readers of the list

vincenzo

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