[srslte-users] srsLTE on Ettus E310

[Tom Chatt]

I had moderate success yesterday running srsLTE on the Ettus Research USRP
E310.  I compiled LibFFTW and srsLTE on the ARM9, and was able to build
srsLTE successfully.  However, when I ran the pdsch_ue demo program, I had
a problem with the software hanging up during the sync process.  The
following output was repeated several hundreds of times (while running with
the -v option enabled):

[INFO]: SYNC ret=0 N_id_2=1 find_offset=0 pos=1545 peak=1.16 threshold=4.00
sf_idx=0, CFO=0.005 KHz
[INFO]: Resetting PBCH decoder after 0 frames

and finally the program terminated with "Cell not found".  I verified using
a USRP B200 and srsLTE running on my PC that there is a cell at the
frequency I checked (739MHz, in Maryland, USA) and srsLTE was able to
decode it with no trouble.  I dug into the source code a bit and found on
lines 130-133 of ue_mib.c:

/* Reset decoder if we missed a frame */
if (q->frame_cnt > 8) {
    INFO("Resetting PBCH decoder after %d frames \n", q->frame_cnt);
    srslte_ue_mib_reset(q);
}

However, in the printout pasted above, q->frame_cnt appears to be 0 every
time.  I can investigate further, but I wonder if this is an issue anyone
has encountered before?

Tom Chatt
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