You're making great progress! Any idea what's wrong with the 2.0 bit timing?
Once you get that done we can work on some serious optimization, since the chain as constituted has a lot of redundancy. Matt On Mon, 2006-05-08 at 14:57 -0400, Charles Swiger wrote: > It turns out to be not too awefully difficult (tho not officially > approved ;) to modify the gnuradio-0.9 atsc code to use a subset > of blocks, specifically everything from bit-timing-loop to > field-sync-demux (float in, soft-data-segments out). So here's > what I have working across 4 cpu's: > > Start with 8Msps complex with signal centered on 0Hz > using usrp_rx_cfile.py to collect data. > > Then simultaneously running: > > 1) One fully 2.x module upsamples to 20Msps and translates > to 5.75Mhz center float, using 99% of one cpu - this is the > bottleneck - piped to: > > 2) A fully 2.x module with root-raised-cosine filter (taps > calculated in python using the 0.9 filter method), the ported > (formerly 0.9) FPLL, and remove-DC (iir), using about 60% > of another cpu, piped to: > > 3) the old 0.9 bit-timing thru fs-demux code, about 55% of > another cpu, piped to > > 4) The 2.x Viterbi, Deinterleaver, Reed-Soloman decoder > and de-randomizer, about 20% of the 4th cpu. > > > It took some hacking on packet padding and de-padding but > the chain works, with some room for moving processes > around and optimizing. For instance, the RF gets mixed > and translated twice. A complex FPLL could handle that > in one step using, say, a more convenient 16Msps (8->16, > instead of 8->40->20) > > Earlier the busiest cpu was only at 60% - switching from > Samba to NFS (the rf datafiles are on another machine) > moved the bottleneck off the network disk sharing to the > resampler module. > > --Chuck > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- Matt Ettus <[EMAIL PROTECTED]> _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
