Hi, There is no throttle block in my flow graph. The USRP source is directly connected to the custom block. In the custom block, I form a 4x8 matrix with 4 being number of USRP's and 8 is the number of samples from each of them. Then I do cross co-variance of the matrix(4x8) with its transpose(8x4). The resulting 4x4 matrix is inverted. I use Armadillo linear algebra package for the co-variance and inverse operations. The computer is equipped with 8 Gig ram and gigabit ethernet card.
Regards, Saran On Wed, Feb 5, 2014 at 2:56 PM, Marcus Müller <[email protected]> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Also, since this is a very common mistake: > Maybe you have a throttle block in your flowgraph. > If that's the case, remove it. > > Greetings, > Marcus > > (Um, how do you invert a 4x8 matrix?) > > On 05.02.2014 03:52, Martin Braun wrote: > > On 04.02.2014 18:46, sarankumar wrote: > >> Hi all, I am encountering overflow errors in my custom block in > >> GRC even for low USRP sample rates of 500 Ksps. The flow graph > >> goes like 4 USRP's connected to the custom block. The block does > >> matrix correlation and inverse. The size of the matrix is 4x8. > >> Any help? Regards, Saran > > > > Your flow graph is probably running too slowly. You could record IQ > > data and try w/ offline data. > > > > MB > > > > > > _______________________________________________ Discuss-gnuradio > > mailing list [email protected] > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1 > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQEcBAEBAgAGBQJS8eCMAAoJEAFxB7BbsDrLUYkH/1t4672Mpoqe873J+kDAVUXg > tUCLdehJ3AXjDhOl+zLvu2MFpzEIJGPmQXltk/94cjeKvIavHOSUqye5XpSOut2H > yuou0nveOSHBHunUm3EIXRdLcoXNbJjjdjqM9lqYbYL3+XfFIDqvCAEcLqbn6WdH > EZa5Qu1bWgsrGNim+wHS7rFtBWbyoB7MGjmzr5xqjJHi7dKJUW4KLGGEFMG2BhlX > srLBQyPUqGxCqEISrKEaxnG0/vUVU0wW4222bssRcWhIOBbq8RVt4I9r8kGYgR76 > nT62QjVBE2SVcvxl/BhDbHJapoHpSEbrdYDKvz2CiD2rqkhM6GC+wwXjXQ+5/6c= > =vIC2 > -----END PGP SIGNATURE----- > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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