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[Discuss-gnuradio] strange deterministic frame error in gr-ieee802-11


From: Nikita Airee
Subject: [Discuss-gnuradio] strange deterministic frame error in gr-ieee802-11
Date: Fri, 13 Jan 2017 15:47:33 +0530

Hi everyone!
  • Ubuntu 14.04
  • Gnuradio version : 3.7.10.1, UHD_3.11.0.git-28-gc66cb1ba
  • 2 USRP 2953R(x310 + cbx40) connected to host laptops using pcie cable, antennae=vert2450
  • center frequency=2.484GHz, samp_rate=10MHz
 I have been transmitting at the rate of 10 Packets/s over wireless link with distance between the tx and rx 3m and 6m. tx_gain is set to 30dB and rx_gain to 0. (I have varied these gains to find no improvement).
I get a constant total frame error rate at the receiver ~10% for a payload of size 50 bytes. The problem is that the frames for which the checksum fails are always the same sequence numbers(10,12,31,39,49,58,89,93,94,95...).
I have tried the different channel estimation algorithms and tried sending the same packet(seq number 0) over and over but still the same numbers are are dropped. I have also increased the interval between transmission to no affect.

Could you please help me with this issue?

Bests,
Nikita Airee

 

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